Merge remote branch 'origin' into secretlab/next-spi
diff --git a/Documentation/spi/ep93xx_spi b/Documentation/spi/ep93xx_spi
new file mode 100644
index 0000000..6325f5b
--- /dev/null
+++ b/Documentation/spi/ep93xx_spi
@@ -0,0 +1,95 @@
+Cirrus EP93xx SPI controller driver HOWTO
+=========================================
+
+ep93xx_spi driver brings SPI master support for EP93xx SPI controller. Chip
+selects are implemented with GPIO lines.
+
+NOTE: If possible, don't use SFRMOUT (SFRM1) signal as a chip select. It will
+not work correctly (it cannot be controlled by software). Use GPIO lines
+instead.
+
+Sample configuration
+====================
+
+Typically driver configuration is done in platform board files (the files under
+arch/arm/mach-ep93xx/*.c). In this example we configure MMC over SPI through
+this driver on TS-7260 board. You can adapt the code to suit your needs.
+
+This example uses EGPIO9 as SD/MMC card chip select (this is wired in DIO1
+header on the board).
+
+You need to select CONFIG_MMC_SPI to use mmc_spi driver.
+
+arch/arm/mach-ep93xx/ts72xx.c:
+
+...
+#include <linux/gpio.h>
+#include <linux/spi/spi.h>
+
+#include <mach/ep93xx_spi.h>
+
+/* this is our GPIO line used for chip select */
+#define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO9
+
+static int ts72xx_mmc_spi_setup(struct spi_device *spi)
+{
+ int err;
+
+ err = gpio_request(MMC_CHIP_SELECT_GPIO, spi->modalias);
+ if (err)
+ return err;
+
+ gpio_direction_output(MMC_CHIP_SELECT_GPIO, 1);
+
+ return 0;
+}
+
+static void ts72xx_mmc_spi_cleanup(struct spi_device *spi)
+{
+ gpio_set_value(MMC_CHIP_SELECT_GPIO, 1);
+ gpio_direction_input(MMC_CHIP_SELECT_GPIO);
+ gpio_free(MMC_CHIP_SELECT_GPIO);
+}
+
+static void ts72xx_mmc_spi_cs_control(struct spi_device *spi, int value)
+{
+ gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
+}
+
+static struct ep93xx_spi_chip_ops ts72xx_mmc_spi_ops = {
+ .setup = ts72xx_mmc_spi_setup,
+ .cleanup = ts72xx_mmc_spi_cleanup,
+ .cs_control = ts72xx_mmc_spi_cs_control,
+};
+
+static struct spi_board_info ts72xx_spi_devices[] __initdata = {
+ {
+ .modalias = "mmc_spi",
+ .controller_data = &ts72xx_mmc_spi_ops,
+ /*
+ * We use 10 MHz even though the maximum is 7.4 MHz. The driver
+ * will limit it automatically to max. frequency.
+ */
+ .max_speed_hz = 10 * 1000 * 1000,
+ .bus_num = 0,
+ .chip_select = 0,
+ .mode = SPI_MODE_0,
+ },
+};
+
+static struct ep93xx_spi_info ts72xx_spi_info = {
+ .num_chipselect = ARRAY_SIZE(ts72xx_spi_devices),
+};
+
+static void __init ts72xx_init_machine(void)
+{
+ ...
+ ep93xx_register_spi(&ts72xx_spi_info, ts72xx_spi_devices,
+ ARRAY_SIZE(ts72xx_spi_devices));
+}
+
+Thanks to
+=========
+Martin Guy, H. Hartley Sweeten and others who helped me during development of
+the driver. Simplemachines.it donated me a Sim.One board which I used testing
+the driver on EP9307.
diff --git a/Documentation/spi/spidev_fdx.c b/Documentation/spi/spidev_fdx.c
index fc354f7..36ec077 100644
--- a/Documentation/spi/spidev_fdx.c
+++ b/Documentation/spi/spidev_fdx.c
@@ -58,10 +58,10 @@
len = sizeof buf;
buf[0] = 0xaa;
- xfer[0].tx_buf = (__u64) buf;
+ xfer[0].tx_buf = (unsigned long)buf;
xfer[0].len = 1;
- xfer[1].rx_buf = (__u64) buf;
+ xfer[1].rx_buf = (unsigned long) buf;
xfer[1].len = len;
status = ioctl(fd, SPI_IOC_MESSAGE(2), xfer);
diff --git a/arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h b/arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h
new file mode 100644
index 0000000..0a37961
--- /dev/null
+++ b/arch/arm/mach-ep93xx/include/mach/ep93xx_spi.h
@@ -0,0 +1,27 @@
+#ifndef __ASM_MACH_EP93XX_SPI_H
+#define __ASM_MACH_EP93XX_SPI_H
+
+struct spi_device;
+
+/**
+ * struct ep93xx_spi_info - EP93xx specific SPI descriptor
+ * @num_chipselect: number of chip selects on this board, must be
+ * at least one
+ */
+struct ep93xx_spi_info {
+ int num_chipselect;
+};
+
+/**
+ * struct ep93xx_spi_chip_ops - operation callbacks for SPI slave device
+ * @setup: setup the chip select mechanism
+ * @cleanup: cleanup the chip select mechanism
+ * @cs_control: control the device chip select
+ */
+struct ep93xx_spi_chip_ops {
+ int (*setup)(struct spi_device *spi);
+ void (*cleanup)(struct spi_device *spi);
+ void (*cs_control)(struct spi_device *spi, int value);
+};
+
+#endif /* __ASM_MACH_EP93XX_SPI_H */
diff --git a/arch/powerpc/include/asm/mpc52xx_psc.h b/arch/powerpc/include/asm/mpc52xx_psc.h
index 42561f4..ecc4fc6 100644
--- a/arch/powerpc/include/asm/mpc52xx_psc.h
+++ b/arch/powerpc/include/asm/mpc52xx_psc.h
@@ -248,6 +248,7 @@
u16 tflwfptr; /* PSC + 0x9e */
};
+#define MPC512x_PSC_FIFO_EOF 0x100
#define MPC512x_PSC_FIFO_RESET_SLICE 0x80
#define MPC512x_PSC_FIFO_ENABLE_SLICE 0x01
#define MPC512x_PSC_FIFO_ENABLE_DMA 0x04
diff --git a/arch/powerpc/platforms/512x/mpc512x_shared.c b/arch/powerpc/platforms/512x/mpc512x_shared.c
index b7f518a..707e572 100644
--- a/arch/powerpc/platforms/512x/mpc512x_shared.c
+++ b/arch/powerpc/platforms/512x/mpc512x_shared.c
@@ -22,6 +22,7 @@
#include <asm/prom.h>
#include <asm/time.h>
#include <asm/mpc5121.h>
+#include <asm/mpc52xx_psc.h>
#include "mpc512x.h"
@@ -95,9 +96,86 @@
}
}
+#define DEFAULT_FIFO_SIZE 16
+
+static unsigned int __init get_fifo_size(struct device_node *np,
+ char *prop_name)
+{
+ const unsigned int *fp;
+
+ fp = of_get_property(np, prop_name, NULL);
+ if (fp)
+ return *fp;
+
+ pr_warning("no %s property in %s node, defaulting to %d\n",
+ prop_name, np->full_name, DEFAULT_FIFO_SIZE);
+
+ return DEFAULT_FIFO_SIZE;
+}
+
+#define FIFOC(_base) ((struct mpc512x_psc_fifo __iomem *) \
+ ((u32)(_base) + sizeof(struct mpc52xx_psc)))
+
+/* Init PSC FIFO space for TX and RX slices */
+void __init mpc512x_psc_fifo_init(void)
+{
+ struct device_node *np;
+ void __iomem *psc;
+ unsigned int tx_fifo_size;
+ unsigned int rx_fifo_size;
+ int fifobase = 0; /* current fifo address in 32 bit words */
+
+ for_each_compatible_node(np, NULL, "fsl,mpc5121-psc") {
+ tx_fifo_size = get_fifo_size(np, "fsl,tx-fifo-size");
+ rx_fifo_size = get_fifo_size(np, "fsl,rx-fifo-size");
+
+ /* size in register is in 4 byte units */
+ tx_fifo_size /= 4;
+ rx_fifo_size /= 4;
+ if (!tx_fifo_size)
+ tx_fifo_size = 1;
+ if (!rx_fifo_size)
+ rx_fifo_size = 1;
+
+ psc = of_iomap(np, 0);
+ if (!psc) {
+ pr_err("%s: Can't map %s device\n",
+ __func__, np->full_name);
+ continue;
+ }
+
+ /* FIFO space is 4KiB, check if requested size is available */
+ if ((fifobase + tx_fifo_size + rx_fifo_size) > 0x1000) {
+ pr_err("%s: no fifo space available for %s\n",
+ __func__, np->full_name);
+ iounmap(psc);
+ /*
+ * chances are that another device requests less
+ * fifo space, so we continue.
+ */
+ continue;
+ }
+
+ /* set tx and rx fifo size registers */
+ out_be32(&FIFOC(psc)->txsz, (fifobase << 16) | tx_fifo_size);
+ fifobase += tx_fifo_size;
+ out_be32(&FIFOC(psc)->rxsz, (fifobase << 16) | rx_fifo_size);
+ fifobase += rx_fifo_size;
+
+ /* reset and enable the slices */
+ out_be32(&FIFOC(psc)->txcmd, 0x80);
+ out_be32(&FIFOC(psc)->txcmd, 0x01);
+ out_be32(&FIFOC(psc)->rxcmd, 0x80);
+ out_be32(&FIFOC(psc)->rxcmd, 0x01);
+
+ iounmap(psc);
+ }
+}
+
void __init mpc512x_init(void)
{
mpc512x_declare_of_platform_devices();
mpc5121_clk_init();
mpc512x_restart_init();
+ mpc512x_psc_fifo_init();
}
diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
index beb4710f..84a35f6 100644
--- a/drivers/serial/mpc52xx_uart.c
+++ b/drivers/serial/mpc52xx_uart.c
@@ -397,34 +397,10 @@
return mpc5xxx_get_bus_frequency(p);
}
-#define DEFAULT_FIFO_SIZE 16
-
-static unsigned int __init get_fifo_size(struct device_node *np,
- char *fifo_name)
-{
- const unsigned int *fp;
-
- fp = of_get_property(np, fifo_name, NULL);
- if (fp)
- return *fp;
-
- pr_warning("no %s property in %s node, defaulting to %d\n",
- fifo_name, np->full_name, DEFAULT_FIFO_SIZE);
-
- return DEFAULT_FIFO_SIZE;
-}
-
-#define FIFOC(_base) ((struct mpc512x_psc_fifo __iomem *) \
- ((u32)(_base) + sizeof(struct mpc52xx_psc)))
-
/* Init PSC FIFO Controller */
static int __init mpc512x_psc_fifoc_init(void)
{
struct device_node *np;
- void __iomem *psc;
- unsigned int tx_fifo_size;
- unsigned int rx_fifo_size;
- int fifobase = 0; /* current fifo address in 32 bit words */
np = of_find_compatible_node(NULL, NULL,
"fsl,mpc5121-psc-fifo");
@@ -447,51 +423,6 @@
return -ENODEV;
}
- for_each_compatible_node(np, NULL, "fsl,mpc5121-psc-uart") {
- tx_fifo_size = get_fifo_size(np, "fsl,tx-fifo-size");
- rx_fifo_size = get_fifo_size(np, "fsl,rx-fifo-size");
-
- /* size in register is in 4 byte units */
- tx_fifo_size /= 4;
- rx_fifo_size /= 4;
- if (!tx_fifo_size)
- tx_fifo_size = 1;
- if (!rx_fifo_size)
- rx_fifo_size = 1;
-
- psc = of_iomap(np, 0);
- if (!psc) {
- pr_err("%s: Can't map %s device\n",
- __func__, np->full_name);
- continue;
- }
-
- /* FIFO space is 4KiB, check if requested size is available */
- if ((fifobase + tx_fifo_size + rx_fifo_size) > 0x1000) {
- pr_err("%s: no fifo space available for %s\n",
- __func__, np->full_name);
- iounmap(psc);
- /*
- * chances are that another device requests less
- * fifo space, so we continue.
- */
- continue;
- }
- /* set tx and rx fifo size registers */
- out_be32(&FIFOC(psc)->txsz, (fifobase << 16) | tx_fifo_size);
- fifobase += tx_fifo_size;
- out_be32(&FIFOC(psc)->rxsz, (fifobase << 16) | rx_fifo_size);
- fifobase += rx_fifo_size;
-
- /* reset and enable the slices */
- out_be32(&FIFOC(psc)->txcmd, 0x80);
- out_be32(&FIFOC(psc)->txcmd, 0x01);
- out_be32(&FIFOC(psc)->rxcmd, 0x80);
- out_be32(&FIFOC(psc)->rxcmd, 0x01);
-
- iounmap(psc);
- }
-
return 0;
}
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index f950b63..91c2f4f 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -117,6 +117,16 @@
help
SPI master controller for DaVinci and DA8xx SPI modules.
+config SPI_EP93XX
+ tristate "Cirrus Logic EP93xx SPI controller"
+ depends on ARCH_EP93XX
+ help
+ This enables using the Cirrus EP93xx SPI controller in master
+ mode.
+
+ To compile this driver as a module, choose M here. The module will be
+ called ep93xx_spi.
+
config SPI_GPIO
tristate "GPIO-based bitbanging SPI Master"
depends on GENERIC_GPIO
@@ -165,6 +175,13 @@
This enables using the Freescale MPC52xx Programmable Serial
Controller in master SPI mode.
+config SPI_MPC512x_PSC
+ tristate "Freescale MPC512x PSC SPI controller"
+ depends on SPI_MASTER && PPC_MPC512x
+ help
+ This enables using the Freescale MPC5121 Programmable Serial
+ Controller in SPI master mode.
+
config SPI_MPC8xxx
tristate "Freescale MPC8xxx SPI controller"
depends on FSL_SOC
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index d7d0f89..e9cbd18 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -21,6 +21,7 @@
obj-$(CONFIG_SPI_DESIGNWARE) += dw_spi.o
obj-$(CONFIG_SPI_DW_PCI) += dw_spi_pci.o
obj-$(CONFIG_SPI_DW_MMIO) += dw_spi_mmio.o
+obj-$(CONFIG_SPI_EP93XX) += ep93xx_spi.o
obj-$(CONFIG_SPI_GPIO) += spi_gpio.o
obj-$(CONFIG_SPI_IMX) += spi_imx.o
obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o
@@ -30,6 +31,7 @@
obj-$(CONFIG_SPI_OMAP_100K) += omap_spi_100k.o
obj-$(CONFIG_SPI_ORION) += orion_spi.o
obj-$(CONFIG_SPI_PL022) += amba-pl022.o
+obj-$(CONFIG_SPI_MPC512x_PSC) += mpc512x_psc_spi.o
obj-$(CONFIG_SPI_MPC52xx_PSC) += mpc52xx_psc_spi.o
obj-$(CONFIG_SPI_MPC52xx) += mpc52xx_spi.o
obj-$(CONFIG_SPI_MPC8xxx) += spi_mpc8xxx.o
diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c
index e9aeee1..f0a1418 100644
--- a/drivers/spi/amba-pl022.c
+++ b/drivers/spi/amba-pl022.c
@@ -102,13 +102,21 @@
/*
* SSP Control Register 0 - SSP_CR0
*/
-#define SSP_CR0_MASK_DSS (0x1FUL << 0)
-#define SSP_CR0_MASK_HALFDUP (0x1UL << 5)
+#define SSP_CR0_MASK_DSS (0x0FUL << 0)
+#define SSP_CR0_MASK_FRF (0x3UL << 4)
#define SSP_CR0_MASK_SPO (0x1UL << 6)
#define SSP_CR0_MASK_SPH (0x1UL << 7)
#define SSP_CR0_MASK_SCR (0xFFUL << 8)
-#define SSP_CR0_MASK_CSS (0x1FUL << 16)
-#define SSP_CR0_MASK_FRF (0x3UL << 21)
+
+/*
+ * The ST version of this block moves som bits
+ * in SSP_CR0 and extends it to 32 bits
+ */
+#define SSP_CR0_MASK_DSS_ST (0x1FUL << 0)
+#define SSP_CR0_MASK_HALFDUP_ST (0x1UL << 5)
+#define SSP_CR0_MASK_CSS_ST (0x1FUL << 16)
+#define SSP_CR0_MASK_FRF_ST (0x3UL << 21)
+
/*
* SSP Control Register 0 - SSP_CR1
@@ -117,16 +125,18 @@
#define SSP_CR1_MASK_SSE (0x1UL << 1)
#define SSP_CR1_MASK_MS (0x1UL << 2)
#define SSP_CR1_MASK_SOD (0x1UL << 3)
-#define SSP_CR1_MASK_RENDN (0x1UL << 4)
-#define SSP_CR1_MASK_TENDN (0x1UL << 5)
-#define SSP_CR1_MASK_MWAIT (0x1UL << 6)
-#define SSP_CR1_MASK_RXIFLSEL (0x7UL << 7)
-#define SSP_CR1_MASK_TXIFLSEL (0x7UL << 10)
/*
- * SSP Data Register - SSP_DR
+ * The ST version of this block adds some bits
+ * in SSP_CR1
*/
-#define SSP_DR_MASK_DATA 0xFFFFFFFF
+#define SSP_CR1_MASK_RENDN_ST (0x1UL << 4)
+#define SSP_CR1_MASK_TENDN_ST (0x1UL << 5)
+#define SSP_CR1_MASK_MWAIT_ST (0x1UL << 6)
+#define SSP_CR1_MASK_RXIFLSEL_ST (0x7UL << 7)
+#define SSP_CR1_MASK_TXIFLSEL_ST (0x7UL << 10)
+/* This one is only in the PL023 variant */
+#define SSP_CR1_MASK_FBCLKDEL_ST (0x7UL << 13)
/*
* SSP Status Register - SSP_SR
@@ -134,7 +144,7 @@
#define SSP_SR_MASK_TFE (0x1UL << 0) /* Transmit FIFO empty */
#define SSP_SR_MASK_TNF (0x1UL << 1) /* Transmit FIFO not full */
#define SSP_SR_MASK_RNE (0x1UL << 2) /* Receive FIFO not empty */
-#define SSP_SR_MASK_RFF (0x1UL << 3) /* Receive FIFO full */
+#define SSP_SR_MASK_RFF (0x1UL << 3) /* Receive FIFO full */
#define SSP_SR_MASK_BSY (0x1UL << 4) /* Busy Flag */
/*
@@ -227,7 +237,7 @@
/*
* SSP Test Data Register - SSP_TDR
*/
-#define TDR_MASK_TESTDATA (0xFFFFFFFF)
+#define TDR_MASK_TESTDATA (0xFFFFFFFF)
/*
* Message State
@@ -235,33 +245,33 @@
* hold a single state value, that's why all this
* (void *) casting is done here.
*/
-#define STATE_START ((void *) 0)
-#define STATE_RUNNING ((void *) 1)
-#define STATE_DONE ((void *) 2)
-#define STATE_ERROR ((void *) -1)
+#define STATE_START ((void *) 0)
+#define STATE_RUNNING ((void *) 1)
+#define STATE_DONE ((void *) 2)
+#define STATE_ERROR ((void *) -1)
/*
* Queue State
*/
-#define QUEUE_RUNNING (0)
-#define QUEUE_STOPPED (1)
+#define QUEUE_RUNNING (0)
+#define QUEUE_STOPPED (1)
/*
* SSP State - Whether Enabled or Disabled
*/
-#define SSP_DISABLED (0)
-#define SSP_ENABLED (1)
+#define SSP_DISABLED (0)
+#define SSP_ENABLED (1)
/*
* SSP DMA State - Whether DMA Enabled or Disabled
*/
-#define SSP_DMA_DISABLED (0)
-#define SSP_DMA_ENABLED (1)
+#define SSP_DMA_DISABLED (0)
+#define SSP_DMA_ENABLED (1)
/*
* SSP Clock Defaults
*/
-#define NMDK_SSP_DEFAULT_CLKRATE 0x2
-#define NMDK_SSP_DEFAULT_PRESCALE 0x40
+#define SSP_DEFAULT_CLKRATE 0x2
+#define SSP_DEFAULT_PRESCALE 0x40
/*
* SSP Clock Parameter ranges
@@ -307,16 +317,22 @@
* @fifodepth: depth of FIFOs (both)
* @max_bpw: maximum number of bits per word
* @unidir: supports unidirection transfers
+ * @extended_cr: 32 bit wide control register 0 with extra
+ * features and extra features in CR1 as found in the ST variants
+ * @pl023: supports a subset of the ST extensions called "PL023"
*/
struct vendor_data {
int fifodepth;
int max_bpw;
bool unidir;
+ bool extended_cr;
+ bool pl023;
};
/**
* struct pl022 - This is the private SSP driver data structure
* @adev: AMBA device model hookup
+ * @vendor: Vendor data for the IP block
* @phybase: The physical memory where the SSP device resides
* @virtbase: The virtual memory where the SSP is mapped
* @master: SPI framework hookup
@@ -369,7 +385,8 @@
/**
* struct chip_data - To maintain runtime state of SSP for each client chip
- * @cr0: Value of control register CR0 of SSP
+ * @cr0: Value of control register CR0 of SSP - on later ST variants this
+ * register is 32 bits wide rather than just 16
* @cr1: Value of control register CR1 of SSP
* @dmacr: Value of DMA control Register of SSP
* @cpsr: Value of Clock prescale register
@@ -384,7 +401,7 @@
* This would be set according to the current message that would be served
*/
struct chip_data {
- u16 cr0;
+ u32 cr0;
u16 cr1;
u16 dmacr;
u16 cpsr;
@@ -517,7 +534,10 @@
{
struct chip_data *chip = pl022->cur_chip;
- writew(chip->cr0, SSP_CR0(pl022->virtbase));
+ if (pl022->vendor->extended_cr)
+ writel(chip->cr0, SSP_CR0(pl022->virtbase));
+ else
+ writew(chip->cr0, SSP_CR0(pl022->virtbase));
writew(chip->cr1, SSP_CR1(pl022->virtbase));
writew(chip->dmacr, SSP_DMACR(pl022->virtbase));
writew(chip->cpsr, SSP_CPSR(pl022->virtbase));
@@ -525,38 +545,70 @@
writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase));
}
-/**
- * load_ssp_default_config - Load default configuration for SSP
- * @pl022: SSP driver private data structure
- */
-
/*
* Default SSP Register Values
*/
#define DEFAULT_SSP_REG_CR0 ( \
GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS, 0) | \
- GEN_MASK_BITS(SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, SSP_CR0_MASK_HALFDUP, 5) | \
+ GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF, 4) | \
GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
- GEN_MASK_BITS(NMDK_SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) | \
- GEN_MASK_BITS(SSP_BITS_8, SSP_CR0_MASK_CSS, 16) | \
- GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF, 21) \
+ GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \
+)
+
+/* ST versions have slightly different bit layout */
+#define DEFAULT_SSP_REG_CR0_ST ( \
+ GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \
+ GEN_MASK_BITS(SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, SSP_CR0_MASK_HALFDUP_ST, 5) | \
+ GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
+ GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
+ GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) | \
+ GEN_MASK_BITS(SSP_BITS_8, SSP_CR0_MASK_CSS_ST, 16) | \
+ GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF_ST, 21) \
+)
+
+/* The PL023 version is slightly different again */
+#define DEFAULT_SSP_REG_CR0_ST_PL023 ( \
+ GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \
+ GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
+ GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
+ GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \
)
#define DEFAULT_SSP_REG_CR1 ( \
GEN_MASK_BITS(LOOPBACK_DISABLED, SSP_CR1_MASK_LBM, 0) | \
GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \
GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \
+ GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) \
+)
+
+/* ST versions extend this register to use all 16 bits */
+#define DEFAULT_SSP_REG_CR1_ST ( \
+ DEFAULT_SSP_REG_CR1 | \
+ GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \
+ GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \
+ GEN_MASK_BITS(SSP_MWIRE_WAIT_ZERO, SSP_CR1_MASK_MWAIT_ST, 6) |\
+ GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \
+ GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) \
+)
+
+/*
+ * The PL023 variant has further differences: no loopback mode, no microwire
+ * support, and a new clock feedback delay setting.
+ */
+#define DEFAULT_SSP_REG_CR1_ST_PL023 ( \
+ GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \
+ GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \
GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) | \
- GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN, 4) | \
- GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN, 5) | \
- GEN_MASK_BITS(SSP_MWIRE_WAIT_ZERO, SSP_CR1_MASK_MWAIT, 6) |\
- GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL, 7) | \
- GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL, 10) \
+ GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \
+ GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \
+ GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \
+ GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) | \
+ GEN_MASK_BITS(SSP_FEEDBACK_CLK_DELAY_NONE, SSP_CR1_MASK_FBCLKDEL_ST, 13) \
)
#define DEFAULT_SSP_REG_CPSR ( \
- GEN_MASK_BITS(NMDK_SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \
+ GEN_MASK_BITS(SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \
)
#define DEFAULT_SSP_REG_DMACR (\
@@ -564,11 +616,22 @@
GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_TXDMAE, 1) \
)
-
+/**
+ * load_ssp_default_config - Load default configuration for SSP
+ * @pl022: SSP driver private data structure
+ */
static void load_ssp_default_config(struct pl022 *pl022)
{
- writew(DEFAULT_SSP_REG_CR0, SSP_CR0(pl022->virtbase));
- writew(DEFAULT_SSP_REG_CR1, SSP_CR1(pl022->virtbase));
+ if (pl022->vendor->pl023) {
+ writel(DEFAULT_SSP_REG_CR0_ST_PL023, SSP_CR0(pl022->virtbase));
+ writew(DEFAULT_SSP_REG_CR1_ST_PL023, SSP_CR1(pl022->virtbase));
+ } else if (pl022->vendor->extended_cr) {
+ writel(DEFAULT_SSP_REG_CR0_ST, SSP_CR0(pl022->virtbase));
+ writew(DEFAULT_SSP_REG_CR1_ST, SSP_CR1(pl022->virtbase));
+ } else {
+ writew(DEFAULT_SSP_REG_CR0, SSP_CR0(pl022->virtbase));
+ writew(DEFAULT_SSP_REG_CR1, SSP_CR1(pl022->virtbase));
+ }
writew(DEFAULT_SSP_REG_DMACR, SSP_DMACR(pl022->virtbase));
writew(DEFAULT_SSP_REG_CPSR, SSP_CPSR(pl022->virtbase));
writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase));
@@ -1008,7 +1071,7 @@
writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE),
SSP_CR1(pl022->virtbase));
- dev_dbg(&pl022->adev->dev, "POLLING TRANSFER ONGOING ... \n");
+ dev_dbg(&pl022->adev->dev, "polling transfer ongoing ...\n");
/* FIXME: insert a timeout so we don't hang here indefinately */
while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end)
readwriter(pl022);
@@ -1148,7 +1211,6 @@
* A wait_queue on the pl022->busy could be used, but then the common
* execution path (pump_messages) would be required to call wake_up or
* friends on every SPI message. Do this instead */
- pl022->run = QUEUE_STOPPED;
while (!list_empty(&pl022->queue) && pl022->busy && limit--) {
spin_unlock_irqrestore(&pl022->queue_lock, flags);
msleep(10);
@@ -1157,6 +1219,7 @@
if (!list_empty(&pl022->queue) || pl022->busy)
status = -EBUSY;
+ else pl022->run = QUEUE_STOPPED;
spin_unlock_irqrestore(&pl022->queue_lock, flags);
@@ -1280,11 +1343,21 @@
"Wait State is configured incorrectly\n");
return -EINVAL;
}
- if ((chip_info->duplex != SSP_MICROWIRE_CHANNEL_FULL_DUPLEX)
- && (chip_info->duplex !=
- SSP_MICROWIRE_CHANNEL_HALF_DUPLEX)) {
- dev_err(chip_info->dev,
- "DUPLEX is configured incorrectly\n");
+ /* Half duplex is only available in the ST Micro version */
+ if (pl022->vendor->extended_cr) {
+ if ((chip_info->duplex !=
+ SSP_MICROWIRE_CHANNEL_FULL_DUPLEX)
+ && (chip_info->duplex !=
+ SSP_MICROWIRE_CHANNEL_HALF_DUPLEX))
+ dev_err(chip_info->dev,
+ "Microwire duplex mode is configured incorrectly\n");
+ return -EINVAL;
+ } else {
+ if (chip_info->duplex != SSP_MICROWIRE_CHANNEL_FULL_DUPLEX)
+ dev_err(chip_info->dev,
+ "Microwire half duplex mode requested,"
+ " but this is only available in the"
+ " ST version of PL022\n");
return -EINVAL;
}
}
@@ -1581,22 +1654,49 @@
chip->cpsr = chip_info->clk_freq.cpsdvsr;
- SSP_WRITE_BITS(chip->cr0, chip_info->data_size, SSP_CR0_MASK_DSS, 0);
- SSP_WRITE_BITS(chip->cr0, chip_info->duplex, SSP_CR0_MASK_HALFDUP, 5);
+ /* Special setup for the ST micro extended control registers */
+ if (pl022->vendor->extended_cr) {
+ if (pl022->vendor->pl023) {
+ /* These bits are only in the PL023 */
+ SSP_WRITE_BITS(chip->cr1, chip_info->clkdelay,
+ SSP_CR1_MASK_FBCLKDEL_ST, 13);
+ } else {
+ /* These bits are in the PL022 but not PL023 */
+ SSP_WRITE_BITS(chip->cr0, chip_info->duplex,
+ SSP_CR0_MASK_HALFDUP_ST, 5);
+ SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len,
+ SSP_CR0_MASK_CSS_ST, 16);
+ SSP_WRITE_BITS(chip->cr0, chip_info->iface,
+ SSP_CR0_MASK_FRF_ST, 21);
+ SSP_WRITE_BITS(chip->cr1, chip_info->wait_state,
+ SSP_CR1_MASK_MWAIT_ST, 6);
+ }
+ SSP_WRITE_BITS(chip->cr0, chip_info->data_size,
+ SSP_CR0_MASK_DSS_ST, 0);
+ SSP_WRITE_BITS(chip->cr1, chip_info->endian_rx,
+ SSP_CR1_MASK_RENDN_ST, 4);
+ SSP_WRITE_BITS(chip->cr1, chip_info->endian_tx,
+ SSP_CR1_MASK_TENDN_ST, 5);
+ SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig,
+ SSP_CR1_MASK_RXIFLSEL_ST, 7);
+ SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig,
+ SSP_CR1_MASK_TXIFLSEL_ST, 10);
+ } else {
+ SSP_WRITE_BITS(chip->cr0, chip_info->data_size,
+ SSP_CR0_MASK_DSS, 0);
+ SSP_WRITE_BITS(chip->cr0, chip_info->iface,
+ SSP_CR0_MASK_FRF, 4);
+ }
+ /* Stuff that is common for all versions */
SSP_WRITE_BITS(chip->cr0, chip_info->clk_pol, SSP_CR0_MASK_SPO, 6);
SSP_WRITE_BITS(chip->cr0, chip_info->clk_phase, SSP_CR0_MASK_SPH, 7);
SSP_WRITE_BITS(chip->cr0, chip_info->clk_freq.scr, SSP_CR0_MASK_SCR, 8);
- SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len, SSP_CR0_MASK_CSS, 16);
- SSP_WRITE_BITS(chip->cr0, chip_info->iface, SSP_CR0_MASK_FRF, 21);
- SSP_WRITE_BITS(chip->cr1, chip_info->lbm, SSP_CR1_MASK_LBM, 0);
+ /* Loopback is available on all versions except PL023 */
+ if (!pl022->vendor->pl023)
+ SSP_WRITE_BITS(chip->cr1, chip_info->lbm, SSP_CR1_MASK_LBM, 0);
SSP_WRITE_BITS(chip->cr1, SSP_DISABLED, SSP_CR1_MASK_SSE, 1);
SSP_WRITE_BITS(chip->cr1, chip_info->hierarchy, SSP_CR1_MASK_MS, 2);
SSP_WRITE_BITS(chip->cr1, chip_info->slave_tx_disable, SSP_CR1_MASK_SOD, 3);
- SSP_WRITE_BITS(chip->cr1, chip_info->endian_rx, SSP_CR1_MASK_RENDN, 4);
- SSP_WRITE_BITS(chip->cr1, chip_info->endian_tx, SSP_CR1_MASK_TENDN, 5);
- SSP_WRITE_BITS(chip->cr1, chip_info->wait_state, SSP_CR1_MASK_MWAIT, 6);
- SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig, SSP_CR1_MASK_RXIFLSEL, 7);
- SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig, SSP_CR1_MASK_TXIFLSEL, 10);
/* Save controller_state */
spi_set_ctldata(spi, chip);
@@ -1809,6 +1909,8 @@
.fifodepth = 8,
.max_bpw = 16,
.unidir = false,
+ .extended_cr = false,
+ .pl023 = false,
};
@@ -1816,6 +1918,16 @@
.fifodepth = 32,
.max_bpw = 32,
.unidir = false,
+ .extended_cr = true,
+ .pl023 = false,
+};
+
+static struct vendor_data vendor_st_pl023 = {
+ .fifodepth = 32,
+ .max_bpw = 32,
+ .unidir = false,
+ .extended_cr = true,
+ .pl023 = true,
};
static struct amba_id pl022_ids[] = {
@@ -1837,6 +1949,18 @@
.mask = 0xffffffff,
.data = &vendor_st,
},
+ {
+ /*
+ * ST-Ericsson derivative "PL023" (this is not
+ * an official ARM number), this is a PL022 SSP block
+ * stripped to SPI mode only, it has 32bit wide
+ * and 32 locations deep TX/RX FIFO but no extended
+ * CR0/CR1 register
+ */
+ .id = 0x00080023,
+ .mask = 0xffffffff,
+ .data = &vendor_st_pl023,
+ },
{ 0, 0 },
};
diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c
index 95afb6b7..b85090c 100644
--- a/drivers/spi/davinci_spi.c
+++ b/drivers/spi/davinci_spi.c
@@ -301,7 +301,7 @@
struct davinci_spi *davinci_spi;
struct davinci_spi_platform_data *pdata;
u8 bits_per_word = 0;
- u32 hz = 0, prescale;
+ u32 hz = 0, prescale = 0, clkspeed;
davinci_spi = spi_master_get_devdata(spi->master);
pdata = davinci_spi->pdata;
@@ -338,10 +338,16 @@
set_fmt_bits(davinci_spi->base, bits_per_word & 0x1f,
spi->chip_select);
- prescale = ((clk_get_rate(davinci_spi->clk) / hz) - 1) & 0xff;
+ clkspeed = clk_get_rate(davinci_spi->clk);
+ if (hz > clkspeed / 2)
+ prescale = 1 << 8;
+ if (hz < clkspeed / 256)
+ prescale = 255 << 8;
+ if (!prescale)
+ prescale = ((clkspeed / hz - 1) << 8) & 0x0000ff00;
clear_fmt_bits(davinci_spi->base, 0x0000ff00, spi->chip_select);
- set_fmt_bits(davinci_spi->base, prescale << 8, spi->chip_select);
+ set_fmt_bits(davinci_spi->base, prescale, spi->chip_select);
return 0;
}
diff --git a/drivers/spi/ep93xx_spi.c b/drivers/spi/ep93xx_spi.c
new file mode 100644
index 0000000..0ba35df
--- /dev/null
+++ b/drivers/spi/ep93xx_spi.c
@@ -0,0 +1,938 @@
+/*
+ * Driver for Cirrus Logic EP93xx SPI controller.
+ *
+ * Copyright (c) 2010 Mika Westerberg
+ *
+ * Explicit FIFO handling code was inspired by amba-pl022 driver.
+ *
+ * Chip select support using other than built-in GPIOs by H. Hartley Sweeten.
+ *
+ * For more information about the SPI controller see documentation on Cirrus
+ * Logic web site:
+ * http://www.cirrus.com/en/pubs/manual/EP93xx_Users_Guide_UM1.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/bitops.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/sched.h>
+#include <linux/spi/spi.h>
+
+#include <mach/ep93xx_spi.h>
+
+#define SSPCR0 0x0000
+#define SSPCR0_MODE_SHIFT 6
+#define SSPCR0_SCR_SHIFT 8
+
+#define SSPCR1 0x0004
+#define SSPCR1_RIE BIT(0)
+#define SSPCR1_TIE BIT(1)
+#define SSPCR1_RORIE BIT(2)
+#define SSPCR1_LBM BIT(3)
+#define SSPCR1_SSE BIT(4)
+#define SSPCR1_MS BIT(5)
+#define SSPCR1_SOD BIT(6)
+
+#define SSPDR 0x0008
+
+#define SSPSR 0x000c
+#define SSPSR_TFE BIT(0)
+#define SSPSR_TNF BIT(1)
+#define SSPSR_RNE BIT(2)
+#define SSPSR_RFF BIT(3)
+#define SSPSR_BSY BIT(4)
+#define SSPCPSR 0x0010
+
+#define SSPIIR 0x0014
+#define SSPIIR_RIS BIT(0)
+#define SSPIIR_TIS BIT(1)
+#define SSPIIR_RORIS BIT(2)
+#define SSPICR SSPIIR
+
+/* timeout in milliseconds */
+#define SPI_TIMEOUT 5
+/* maximum depth of RX/TX FIFO */
+#define SPI_FIFO_SIZE 8
+
+/**
+ * struct ep93xx_spi - EP93xx SPI controller structure
+ * @lock: spinlock that protects concurrent accesses to fields @running,
+ * @current_msg and @msg_queue
+ * @pdev: pointer to platform device
+ * @clk: clock for the controller
+ * @regs_base: pointer to ioremap()'d registers
+ * @irq: IRQ number used by the driver
+ * @min_rate: minimum clock rate (in Hz) supported by the controller
+ * @max_rate: maximum clock rate (in Hz) supported by the controller
+ * @running: is the queue running
+ * @wq: workqueue used by the driver
+ * @msg_work: work that is queued for the driver
+ * @wait: wait here until given transfer is completed
+ * @msg_queue: queue for the messages
+ * @current_msg: message that is currently processed (or %NULL if none)
+ * @tx: current byte in transfer to transmit
+ * @rx: current byte in transfer to receive
+ * @fifo_level: how full is FIFO (%0..%SPI_FIFO_SIZE - %1). Receiving one
+ * frame decreases this level and sending one frame increases it.
+ *
+ * This structure holds EP93xx SPI controller specific information. When
+ * @running is %true, driver accepts transfer requests from protocol drivers.
+ * @current_msg is used to hold pointer to the message that is currently
+ * processed. If @current_msg is %NULL, it means that no processing is going
+ * on.
+ *
+ * Most of the fields are only written once and they can be accessed without
+ * taking the @lock. Fields that are accessed concurrently are: @current_msg,
+ * @running, and @msg_queue.
+ */
+struct ep93xx_spi {
+ spinlock_t lock;
+ const struct platform_device *pdev;
+ struct clk *clk;
+ void __iomem *regs_base;
+ int irq;
+ unsigned long min_rate;
+ unsigned long max_rate;
+ bool running;
+ struct workqueue_struct *wq;
+ struct work_struct msg_work;
+ struct completion wait;
+ struct list_head msg_queue;
+ struct spi_message *current_msg;
+ size_t tx;
+ size_t rx;
+ size_t fifo_level;
+};
+
+/**
+ * struct ep93xx_spi_chip - SPI device hardware settings
+ * @spi: back pointer to the SPI device
+ * @rate: max rate in hz this chip supports
+ * @div_cpsr: cpsr (pre-scaler) divider
+ * @div_scr: scr divider
+ * @dss: bits per word (4 - 16 bits)
+ * @ops: private chip operations
+ *
+ * This structure is used to store hardware register specific settings for each
+ * SPI device. Settings are written to hardware by function
+ * ep93xx_spi_chip_setup().
+ */
+struct ep93xx_spi_chip {
+ const struct spi_device *spi;
+ unsigned long rate;
+ u8 div_cpsr;
+ u8 div_scr;
+ u8 dss;
+ struct ep93xx_spi_chip_ops *ops;
+};
+
+/* converts bits per word to CR0.DSS value */
+#define bits_per_word_to_dss(bpw) ((bpw) - 1)
+
+static inline void
+ep93xx_spi_write_u8(const struct ep93xx_spi *espi, u16 reg, u8 value)
+{
+ __raw_writeb(value, espi->regs_base + reg);
+}
+
+static inline u8
+ep93xx_spi_read_u8(const struct ep93xx_spi *spi, u16 reg)
+{
+ return __raw_readb(spi->regs_base + reg);
+}
+
+static inline void
+ep93xx_spi_write_u16(const struct ep93xx_spi *espi, u16 reg, u16 value)
+{
+ __raw_writew(value, espi->regs_base + reg);
+}
+
+static inline u16
+ep93xx_spi_read_u16(const struct ep93xx_spi *spi, u16 reg)
+{
+ return __raw_readw(spi->regs_base + reg);
+}
+
+static int ep93xx_spi_enable(const struct ep93xx_spi *espi)
+{
+ u8 regval;
+ int err;
+
+ err = clk_enable(espi->clk);
+ if (err)
+ return err;
+
+ regval = ep93xx_spi_read_u8(espi, SSPCR1);
+ regval |= SSPCR1_SSE;
+ ep93xx_spi_write_u8(espi, SSPCR1, regval);
+
+ return 0;
+}
+
+static void ep93xx_spi_disable(const struct ep93xx_spi *espi)
+{
+ u8 regval;
+
+ regval = ep93xx_spi_read_u8(espi, SSPCR1);
+ regval &= ~SSPCR1_SSE;
+ ep93xx_spi_write_u8(espi, SSPCR1, regval);
+
+ clk_disable(espi->clk);
+}
+
+static void ep93xx_spi_enable_interrupts(const struct ep93xx_spi *espi)
+{
+ u8 regval;
+
+ regval = ep93xx_spi_read_u8(espi, SSPCR1);
+ regval |= (SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE);
+ ep93xx_spi_write_u8(espi, SSPCR1, regval);
+}
+
+static void ep93xx_spi_disable_interrupts(const struct ep93xx_spi *espi)
+{
+ u8 regval;
+
+ regval = ep93xx_spi_read_u8(espi, SSPCR1);
+ regval &= ~(SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE);
+ ep93xx_spi_write_u8(espi, SSPCR1, regval);
+}
+
+/**
+ * ep93xx_spi_calc_divisors() - calculates SPI clock divisors
+ * @espi: ep93xx SPI controller struct
+ * @chip: divisors are calculated for this chip
+ * @rate: desired SPI output clock rate
+ *
+ * Function calculates cpsr (clock pre-scaler) and scr divisors based on
+ * given @rate and places them to @chip->div_cpsr and @chip->div_scr. If,
+ * for some reason, divisors cannot be calculated nothing is stored and
+ * %-EINVAL is returned.
+ */
+static int ep93xx_spi_calc_divisors(const struct ep93xx_spi *espi,
+ struct ep93xx_spi_chip *chip,
+ unsigned long rate)
+{
+ unsigned long spi_clk_rate = clk_get_rate(espi->clk);
+ int cpsr, scr;
+
+ /*
+ * Make sure that max value is between values supported by the
+ * controller. Note that minimum value is already checked in
+ * ep93xx_spi_transfer().
+ */
+ rate = clamp(rate, espi->min_rate, espi->max_rate);
+
+ /*
+ * Calculate divisors so that we can get speed according the
+ * following formula:
+ * rate = spi_clock_rate / (cpsr * (1 + scr))
+ *
+ * cpsr must be even number and starts from 2, scr can be any number
+ * between 0 and 255.
+ */
+ for (cpsr = 2; cpsr <= 254; cpsr += 2) {
+ for (scr = 0; scr <= 255; scr++) {
+ if ((spi_clk_rate / (cpsr * (scr + 1))) <= rate) {
+ chip->div_scr = (u8)scr;
+ chip->div_cpsr = (u8)cpsr;
+ return 0;
+ }
+ }
+ }
+
+ return -EINVAL;
+}
+
+static void ep93xx_spi_cs_control(struct spi_device *spi, bool control)
+{
+ struct ep93xx_spi_chip *chip = spi_get_ctldata(spi);
+ int value = (spi->mode & SPI_CS_HIGH) ? control : !control;
+
+ if (chip->ops && chip->ops->cs_control)
+ chip->ops->cs_control(spi, value);
+}
+
+/**
+ * ep93xx_spi_setup() - setup an SPI device
+ * @spi: SPI device to setup
+ *
+ * This function sets up SPI device mode, speed etc. Can be called multiple
+ * times for a single device. Returns %0 in case of success, negative error in
+ * case of failure. When this function returns success, the device is
+ * deselected.
+ */
+static int ep93xx_spi_setup(struct spi_device *spi)
+{
+ struct ep93xx_spi *espi = spi_master_get_devdata(spi->master);
+ struct ep93xx_spi_chip *chip;
+
+ if (spi->bits_per_word < 4 || spi->bits_per_word > 16) {
+ dev_err(&espi->pdev->dev, "invalid bits per word %d\n",
+ spi->bits_per_word);
+ return -EINVAL;
+ }
+
+ chip = spi_get_ctldata(spi);
+ if (!chip) {
+ dev_dbg(&espi->pdev->dev, "initial setup for %s\n",
+ spi->modalias);
+
+ chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->spi = spi;
+ chip->ops = spi->controller_data;
+
+ if (chip->ops && chip->ops->setup) {
+ int ret = chip->ops->setup(spi);
+ if (ret) {
+ kfree(chip);
+ return ret;
+ }
+ }
+
+ spi_set_ctldata(spi, chip);
+ }
+
+ if (spi->max_speed_hz != chip->rate) {
+ int err;
+
+ err = ep93xx_spi_calc_divisors(espi, chip, spi->max_speed_hz);
+ if (err != 0) {
+ spi_set_ctldata(spi, NULL);
+ kfree(chip);
+ return err;
+ }
+ chip->rate = spi->max_speed_hz;
+ }
+
+ chip->dss = bits_per_word_to_dss(spi->bits_per_word);
+
+ ep93xx_spi_cs_control(spi, false);
+ return 0;
+}
+
+/**
+ * ep93xx_spi_transfer() - queue message to be transferred
+ * @spi: target SPI device
+ * @msg: message to be transferred
+ *
+ * This function is called by SPI device drivers when they are going to transfer
+ * a new message. It simply puts the message in the queue and schedules
+ * workqueue to perform the actual transfer later on.
+ *
+ * Returns %0 on success and negative error in case of failure.
+ */
+static int ep93xx_spi_transfer(struct spi_device *spi, struct spi_message *msg)
+{
+ struct ep93xx_spi *espi = spi_master_get_devdata(spi->master);
+ struct spi_transfer *t;
+ unsigned long flags;
+
+ if (!msg || !msg->complete)
+ return -EINVAL;
+
+ /* first validate each transfer */
+ list_for_each_entry(t, &msg->transfers, transfer_list) {
+ if (t->bits_per_word) {
+ if (t->bits_per_word < 4 || t->bits_per_word > 16)
+ return -EINVAL;
+ }
+ if (t->speed_hz && t->speed_hz < espi->min_rate)
+ return -EINVAL;
+ }
+
+ /*
+ * Now that we own the message, let's initialize it so that it is
+ * suitable for us. We use @msg->status to signal whether there was
+ * error in transfer and @msg->state is used to hold pointer to the
+ * current transfer (or %NULL if no active current transfer).
+ */
+ msg->state = NULL;
+ msg->status = 0;
+ msg->actual_length = 0;
+
+ spin_lock_irqsave(&espi->lock, flags);
+ if (!espi->running) {
+ spin_unlock_irqrestore(&espi->lock, flags);
+ return -ESHUTDOWN;
+ }
+ list_add_tail(&msg->queue, &espi->msg_queue);
+ queue_work(espi->wq, &espi->msg_work);
+ spin_unlock_irqrestore(&espi->lock, flags);
+
+ return 0;
+}
+
+/**
+ * ep93xx_spi_cleanup() - cleans up master controller specific state
+ * @spi: SPI device to cleanup
+ *
+ * This function releases master controller specific state for given @spi
+ * device.
+ */
+static void ep93xx_spi_cleanup(struct spi_device *spi)
+{
+ struct ep93xx_spi_chip *chip;
+
+ chip = spi_get_ctldata(spi);
+ if (chip) {
+ if (chip->ops && chip->ops->cleanup)
+ chip->ops->cleanup(spi);
+ spi_set_ctldata(spi, NULL);
+ kfree(chip);
+ }
+}
+
+/**
+ * ep93xx_spi_chip_setup() - configures hardware according to given @chip
+ * @espi: ep93xx SPI controller struct
+ * @chip: chip specific settings
+ *
+ * This function sets up the actual hardware registers with settings given in
+ * @chip. Note that no validation is done so make sure that callers validate
+ * settings before calling this.
+ */
+static void ep93xx_spi_chip_setup(const struct ep93xx_spi *espi,
+ const struct ep93xx_spi_chip *chip)
+{
+ u16 cr0;
+
+ cr0 = chip->div_scr << SSPCR0_SCR_SHIFT;
+ cr0 |= (chip->spi->mode & (SPI_CPHA|SPI_CPOL)) << SSPCR0_MODE_SHIFT;
+ cr0 |= chip->dss;
+
+ dev_dbg(&espi->pdev->dev, "setup: mode %d, cpsr %d, scr %d, dss %d\n",
+ chip->spi->mode, chip->div_cpsr, chip->div_scr, chip->dss);
+ dev_dbg(&espi->pdev->dev, "setup: cr0 %#x", cr0);
+
+ ep93xx_spi_write_u8(espi, SSPCPSR, chip->div_cpsr);
+ ep93xx_spi_write_u16(espi, SSPCR0, cr0);
+}
+
+static inline int bits_per_word(const struct ep93xx_spi *espi)
+{
+ struct spi_message *msg = espi->current_msg;
+ struct spi_transfer *t = msg->state;
+
+ return t->bits_per_word ? t->bits_per_word : msg->spi->bits_per_word;
+}
+
+static void ep93xx_do_write(struct ep93xx_spi *espi, struct spi_transfer *t)
+{
+ if (bits_per_word(espi) > 8) {
+ u16 tx_val = 0;
+
+ if (t->tx_buf)
+ tx_val = ((u16 *)t->tx_buf)[espi->tx];
+ ep93xx_spi_write_u16(espi, SSPDR, tx_val);
+ espi->tx += sizeof(tx_val);
+ } else {
+ u8 tx_val = 0;
+
+ if (t->tx_buf)
+ tx_val = ((u8 *)t->tx_buf)[espi->tx];
+ ep93xx_spi_write_u8(espi, SSPDR, tx_val);
+ espi->tx += sizeof(tx_val);
+ }
+}
+
+static void ep93xx_do_read(struct ep93xx_spi *espi, struct spi_transfer *t)
+{
+ if (bits_per_word(espi) > 8) {
+ u16 rx_val;
+
+ rx_val = ep93xx_spi_read_u16(espi, SSPDR);
+ if (t->rx_buf)
+ ((u16 *)t->rx_buf)[espi->rx] = rx_val;
+ espi->rx += sizeof(rx_val);
+ } else {
+ u8 rx_val;
+
+ rx_val = ep93xx_spi_read_u8(espi, SSPDR);
+ if (t->rx_buf)
+ ((u8 *)t->rx_buf)[espi->rx] = rx_val;
+ espi->rx += sizeof(rx_val);
+ }
+}
+
+/**
+ * ep93xx_spi_read_write() - perform next RX/TX transfer
+ * @espi: ep93xx SPI controller struct
+ *
+ * This function transfers next bytes (or half-words) to/from RX/TX FIFOs. If
+ * called several times, the whole transfer will be completed. Returns
+ * %-EINPROGRESS when current transfer was not yet completed otherwise %0.
+ *
+ * When this function is finished, RX FIFO should be empty and TX FIFO should be
+ * full.
+ */
+static int ep93xx_spi_read_write(struct ep93xx_spi *espi)
+{
+ struct spi_message *msg = espi->current_msg;
+ struct spi_transfer *t = msg->state;
+
+ /* read as long as RX FIFO has frames in it */
+ while ((ep93xx_spi_read_u8(espi, SSPSR) & SSPSR_RNE)) {
+ ep93xx_do_read(espi, t);
+ espi->fifo_level--;
+ }
+
+ /* write as long as TX FIFO has room */
+ while (espi->fifo_level < SPI_FIFO_SIZE && espi->tx < t->len) {
+ ep93xx_do_write(espi, t);
+ espi->fifo_level++;
+ }
+
+ if (espi->rx == t->len) {
+ msg->actual_length += t->len;
+ return 0;
+ }
+
+ return -EINPROGRESS;
+}
+
+/**
+ * ep93xx_spi_process_transfer() - processes one SPI transfer
+ * @espi: ep93xx SPI controller struct
+ * @msg: current message
+ * @t: transfer to process
+ *
+ * This function processes one SPI transfer given in @t. Function waits until
+ * transfer is complete (may sleep) and updates @msg->status based on whether
+ * transfer was succesfully processed or not.
+ */
+static void ep93xx_spi_process_transfer(struct ep93xx_spi *espi,
+ struct spi_message *msg,
+ struct spi_transfer *t)
+{
+ struct ep93xx_spi_chip *chip = spi_get_ctldata(msg->spi);
+
+ msg->state = t;
+
+ /*
+ * Handle any transfer specific settings if needed. We use
+ * temporary chip settings here and restore original later when
+ * the transfer is finished.
+ */
+ if (t->speed_hz || t->bits_per_word) {
+ struct ep93xx_spi_chip tmp_chip = *chip;
+
+ if (t->speed_hz) {
+ int err;
+
+ err = ep93xx_spi_calc_divisors(espi, &tmp_chip,
+ t->speed_hz);
+ if (err) {
+ dev_err(&espi->pdev->dev,
+ "failed to adjust speed\n");
+ msg->status = err;
+ return;
+ }
+ }
+
+ if (t->bits_per_word)
+ tmp_chip.dss = bits_per_word_to_dss(t->bits_per_word);
+
+ /*
+ * Set up temporary new hw settings for this transfer.
+ */
+ ep93xx_spi_chip_setup(espi, &tmp_chip);
+ }
+
+ espi->rx = 0;
+ espi->tx = 0;
+
+ /*
+ * Now everything is set up for the current transfer. We prime the TX
+ * FIFO, enable interrupts, and wait for the transfer to complete.
+ */
+ if (ep93xx_spi_read_write(espi)) {
+ ep93xx_spi_enable_interrupts(espi);
+ wait_for_completion(&espi->wait);
+ }
+
+ /*
+ * In case of error during transmit, we bail out from processing
+ * the message.
+ */
+ if (msg->status)
+ return;
+
+ /*
+ * After this transfer is finished, perform any possible
+ * post-transfer actions requested by the protocol driver.
+ */
+ if (t->delay_usecs) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(usecs_to_jiffies(t->delay_usecs));
+ }
+ if (t->cs_change) {
+ if (!list_is_last(&t->transfer_list, &msg->transfers)) {
+ /*
+ * In case protocol driver is asking us to drop the
+ * chipselect briefly, we let the scheduler to handle
+ * any "delay" here.
+ */
+ ep93xx_spi_cs_control(msg->spi, false);
+ cond_resched();
+ ep93xx_spi_cs_control(msg->spi, true);
+ }
+ }
+
+ if (t->speed_hz || t->bits_per_word)
+ ep93xx_spi_chip_setup(espi, chip);
+}
+
+/*
+ * ep93xx_spi_process_message() - process one SPI message
+ * @espi: ep93xx SPI controller struct
+ * @msg: message to process
+ *
+ * This function processes a single SPI message. We go through all transfers in
+ * the message and pass them to ep93xx_spi_process_transfer(). Chipselect is
+ * asserted during the whole message (unless per transfer cs_change is set).
+ *
+ * @msg->status contains %0 in case of success or negative error code in case of
+ * failure.
+ */
+static void ep93xx_spi_process_message(struct ep93xx_spi *espi,
+ struct spi_message *msg)
+{
+ unsigned long timeout;
+ struct spi_transfer *t;
+ int err;
+
+ /*
+ * Enable the SPI controller and its clock.
+ */
+ err = ep93xx_spi_enable(espi);
+ if (err) {
+ dev_err(&espi->pdev->dev, "failed to enable SPI controller\n");
+ msg->status = err;
+ return;
+ }
+
+ /*
+ * Just to be sure: flush any data from RX FIFO.
+ */
+ timeout = jiffies + msecs_to_jiffies(SPI_TIMEOUT);
+ while (ep93xx_spi_read_u16(espi, SSPSR) & SSPSR_RNE) {
+ if (time_after(jiffies, timeout)) {
+ dev_warn(&espi->pdev->dev,
+ "timeout while flushing RX FIFO\n");
+ msg->status = -ETIMEDOUT;
+ return;
+ }
+ ep93xx_spi_read_u16(espi, SSPDR);
+ }
+
+ /*
+ * We explicitly handle FIFO level. This way we don't have to check TX
+ * FIFO status using %SSPSR_TNF bit which may cause RX FIFO overruns.
+ */
+ espi->fifo_level = 0;
+
+ /*
+ * Update SPI controller registers according to spi device and assert
+ * the chipselect.
+ */
+ ep93xx_spi_chip_setup(espi, spi_get_ctldata(msg->spi));
+ ep93xx_spi_cs_control(msg->spi, true);
+
+ list_for_each_entry(t, &msg->transfers, transfer_list) {
+ ep93xx_spi_process_transfer(espi, msg, t);
+ if (msg->status)
+ break;
+ }
+
+ /*
+ * Now the whole message is transferred (or failed for some reason). We
+ * deselect the device and disable the SPI controller.
+ */
+ ep93xx_spi_cs_control(msg->spi, false);
+ ep93xx_spi_disable(espi);
+}
+
+#define work_to_espi(work) (container_of((work), struct ep93xx_spi, msg_work))
+
+/**
+ * ep93xx_spi_work() - EP93xx SPI workqueue worker function
+ * @work: work struct
+ *
+ * Workqueue worker function. This function is called when there are new
+ * SPI messages to be processed. Message is taken out from the queue and then
+ * passed to ep93xx_spi_process_message().
+ *
+ * After message is transferred, protocol driver is notified by calling
+ * @msg->complete(). In case of error, @msg->status is set to negative error
+ * number, otherwise it contains zero (and @msg->actual_length is updated).
+ */
+static void ep93xx_spi_work(struct work_struct *work)
+{
+ struct ep93xx_spi *espi = work_to_espi(work);
+ struct spi_message *msg;
+
+ spin_lock_irq(&espi->lock);
+ if (!espi->running || espi->current_msg ||
+ list_empty(&espi->msg_queue)) {
+ spin_unlock_irq(&espi->lock);
+ return;
+ }
+ msg = list_first_entry(&espi->msg_queue, struct spi_message, queue);
+ list_del_init(&msg->queue);
+ espi->current_msg = msg;
+ spin_unlock_irq(&espi->lock);
+
+ ep93xx_spi_process_message(espi, msg);
+
+ /*
+ * Update the current message and re-schedule ourselves if there are
+ * more messages in the queue.
+ */
+ spin_lock_irq(&espi->lock);
+ espi->current_msg = NULL;
+ if (espi->running && !list_empty(&espi->msg_queue))
+ queue_work(espi->wq, &espi->msg_work);
+ spin_unlock_irq(&espi->lock);
+
+ /* notify the protocol driver that we are done with this message */
+ msg->complete(msg->context);
+}
+
+static irqreturn_t ep93xx_spi_interrupt(int irq, void *dev_id)
+{
+ struct ep93xx_spi *espi = dev_id;
+ u8 irq_status = ep93xx_spi_read_u8(espi, SSPIIR);
+
+ /*
+ * If we got ROR (receive overrun) interrupt we know that something is
+ * wrong. Just abort the message.
+ */
+ if (unlikely(irq_status & SSPIIR_RORIS)) {
+ /* clear the overrun interrupt */
+ ep93xx_spi_write_u8(espi, SSPICR, 0);
+ dev_warn(&espi->pdev->dev,
+ "receive overrun, aborting the message\n");
+ espi->current_msg->status = -EIO;
+ } else {
+ /*
+ * Interrupt is either RX (RIS) or TX (TIS). For both cases we
+ * simply execute next data transfer.
+ */
+ if (ep93xx_spi_read_write(espi)) {
+ /*
+ * In normal case, there still is some processing left
+ * for current transfer. Let's wait for the next
+ * interrupt then.
+ */
+ return IRQ_HANDLED;
+ }
+ }
+
+ /*
+ * Current transfer is finished, either with error or with success. In
+ * any case we disable interrupts and notify the worker to handle
+ * any post-processing of the message.
+ */
+ ep93xx_spi_disable_interrupts(espi);
+ complete(&espi->wait);
+ return IRQ_HANDLED;
+}
+
+static int __init ep93xx_spi_probe(struct platform_device *pdev)
+{
+ struct spi_master *master;
+ struct ep93xx_spi_info *info;
+ struct ep93xx_spi *espi;
+ struct resource *res;
+ int error;
+
+ info = pdev->dev.platform_data;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(*espi));
+ if (!master) {
+ dev_err(&pdev->dev, "failed to allocate spi master\n");
+ return -ENOMEM;
+ }
+
+ master->setup = ep93xx_spi_setup;
+ master->transfer = ep93xx_spi_transfer;
+ master->cleanup = ep93xx_spi_cleanup;
+ master->bus_num = pdev->id;
+ master->num_chipselect = info->num_chipselect;
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+
+ platform_set_drvdata(pdev, master);
+
+ espi = spi_master_get_devdata(master);
+
+ espi->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(espi->clk)) {
+ dev_err(&pdev->dev, "unable to get spi clock\n");
+ error = PTR_ERR(espi->clk);
+ goto fail_release_master;
+ }
+
+ spin_lock_init(&espi->lock);
+ init_completion(&espi->wait);
+
+ /*
+ * Calculate maximum and minimum supported clock rates
+ * for the controller.
+ */
+ espi->max_rate = clk_get_rate(espi->clk) / 2;
+ espi->min_rate = clk_get_rate(espi->clk) / (254 * 256);
+ espi->pdev = pdev;
+
+ espi->irq = platform_get_irq(pdev, 0);
+ if (espi->irq < 0) {
+ error = -EBUSY;
+ dev_err(&pdev->dev, "failed to get irq resources\n");
+ goto fail_put_clock;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "unable to get iomem resource\n");
+ error = -ENODEV;
+ goto fail_put_clock;
+ }
+
+ res = request_mem_region(res->start, resource_size(res), pdev->name);
+ if (!res) {
+ dev_err(&pdev->dev, "unable to request iomem resources\n");
+ error = -EBUSY;
+ goto fail_put_clock;
+ }
+
+ espi->regs_base = ioremap(res->start, resource_size(res));
+ if (!espi->regs_base) {
+ dev_err(&pdev->dev, "failed to map resources\n");
+ error = -ENODEV;
+ goto fail_free_mem;
+ }
+
+ error = request_irq(espi->irq, ep93xx_spi_interrupt, 0,
+ "ep93xx-spi", espi);
+ if (error) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ goto fail_unmap_regs;
+ }
+
+ espi->wq = create_singlethread_workqueue("ep93xx_spid");
+ if (!espi->wq) {
+ dev_err(&pdev->dev, "unable to create workqueue\n");
+ goto fail_free_irq;
+ }
+ INIT_WORK(&espi->msg_work, ep93xx_spi_work);
+ INIT_LIST_HEAD(&espi->msg_queue);
+ espi->running = true;
+
+ /* make sure that the hardware is disabled */
+ ep93xx_spi_write_u8(espi, SSPCR1, 0);
+
+ error = spi_register_master(master);
+ if (error) {
+ dev_err(&pdev->dev, "failed to register SPI master\n");
+ goto fail_free_queue;
+ }
+
+ dev_info(&pdev->dev, "EP93xx SPI Controller at 0x%08lx irq %d\n",
+ (unsigned long)res->start, espi->irq);
+
+ return 0;
+
+fail_free_queue:
+ destroy_workqueue(espi->wq);
+fail_free_irq:
+ free_irq(espi->irq, espi);
+fail_unmap_regs:
+ iounmap(espi->regs_base);
+fail_free_mem:
+ release_mem_region(res->start, resource_size(res));
+fail_put_clock:
+ clk_put(espi->clk);
+fail_release_master:
+ spi_master_put(master);
+ platform_set_drvdata(pdev, NULL);
+
+ return error;
+}
+
+static int __exit ep93xx_spi_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct ep93xx_spi *espi = spi_master_get_devdata(master);
+ struct resource *res;
+
+ spin_lock_irq(&espi->lock);
+ espi->running = false;
+ spin_unlock_irq(&espi->lock);
+
+ destroy_workqueue(espi->wq);
+
+ /*
+ * Complete remaining messages with %-ESHUTDOWN status.
+ */
+ spin_lock_irq(&espi->lock);
+ while (!list_empty(&espi->msg_queue)) {
+ struct spi_message *msg;
+
+ msg = list_first_entry(&espi->msg_queue,
+ struct spi_message, queue);
+ list_del_init(&msg->queue);
+ msg->status = -ESHUTDOWN;
+ spin_unlock_irq(&espi->lock);
+ msg->complete(msg->context);
+ spin_lock_irq(&espi->lock);
+ }
+ spin_unlock_irq(&espi->lock);
+
+ free_irq(espi->irq, espi);
+ iounmap(espi->regs_base);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(res->start, resource_size(res));
+ clk_put(espi->clk);
+ platform_set_drvdata(pdev, NULL);
+
+ spi_unregister_master(master);
+ return 0;
+}
+
+static struct platform_driver ep93xx_spi_driver = {
+ .driver = {
+ .name = "ep93xx-spi",
+ .owner = THIS_MODULE,
+ },
+ .remove = __exit_p(ep93xx_spi_remove),
+};
+
+static int __init ep93xx_spi_init(void)
+{
+ return platform_driver_probe(&ep93xx_spi_driver, ep93xx_spi_probe);
+}
+module_init(ep93xx_spi_init);
+
+static void __exit ep93xx_spi_exit(void)
+{
+ platform_driver_unregister(&ep93xx_spi_driver);
+}
+module_exit(ep93xx_spi_exit);
+
+MODULE_DESCRIPTION("EP93xx SPI Controller driver");
+MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ep93xx-spi");
diff --git a/drivers/spi/mpc512x_psc_spi.c b/drivers/spi/mpc512x_psc_spi.c
new file mode 100644
index 0000000..28a126d
--- /dev/null
+++ b/drivers/spi/mpc512x_psc_spi.c
@@ -0,0 +1,576 @@
+/*
+ * MPC512x PSC in SPI mode driver.
+ *
+ * Copyright (C) 2007,2008 Freescale Semiconductor Inc.
+ * Original port from 52xx driver:
+ * Hongjun Chen <hong-jun.chen@freescale.com>
+ *
+ * Fork of mpc52xx_psc_spi.c:
+ * Copyright (C) 2006 TOPTICA Photonics AG., Dragos Carp
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/of_platform.h>
+#include <linux/workqueue.h>
+#include <linux/completion.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/spi/spi.h>
+#include <linux/fsl_devices.h>
+#include <asm/mpc52xx_psc.h>
+
+struct mpc512x_psc_spi {
+ void (*cs_control)(struct spi_device *spi, bool on);
+ u32 sysclk;
+
+ /* driver internal data */
+ struct mpc52xx_psc __iomem *psc;
+ struct mpc512x_psc_fifo __iomem *fifo;
+ unsigned int irq;
+ u8 bits_per_word;
+ u8 busy;
+ u32 mclk;
+ u8 eofbyte;
+
+ struct workqueue_struct *workqueue;
+ struct work_struct work;
+
+ struct list_head queue;
+ spinlock_t lock; /* Message queue lock */
+
+ struct completion done;
+};
+
+/* controller state */
+struct mpc512x_psc_spi_cs {
+ int bits_per_word;
+ int speed_hz;
+};
+
+/* set clock freq, clock ramp, bits per work
+ * if t is NULL then reset the values to the default values
+ */
+static int mpc512x_psc_spi_transfer_setup(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct mpc512x_psc_spi_cs *cs = spi->controller_state;
+
+ cs->speed_hz = (t && t->speed_hz)
+ ? t->speed_hz : spi->max_speed_hz;
+ cs->bits_per_word = (t && t->bits_per_word)
+ ? t->bits_per_word : spi->bits_per_word;
+ cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8;
+ return 0;
+}
+
+static void mpc512x_psc_spi_activate_cs(struct spi_device *spi)
+{
+ struct mpc512x_psc_spi_cs *cs = spi->controller_state;
+ struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master);
+ struct mpc52xx_psc __iomem *psc = mps->psc;
+ u32 sicr;
+ u32 ccr;
+ u16 bclkdiv;
+
+ sicr = in_be32(&psc->sicr);
+
+ /* Set clock phase and polarity */
+ if (spi->mode & SPI_CPHA)
+ sicr |= 0x00001000;
+ else
+ sicr &= ~0x00001000;
+
+ if (spi->mode & SPI_CPOL)
+ sicr |= 0x00002000;
+ else
+ sicr &= ~0x00002000;
+
+ if (spi->mode & SPI_LSB_FIRST)
+ sicr |= 0x10000000;
+ else
+ sicr &= ~0x10000000;
+ out_be32(&psc->sicr, sicr);
+
+ ccr = in_be32(&psc->ccr);
+ ccr &= 0xFF000000;
+ if (cs->speed_hz)
+ bclkdiv = (mps->mclk / cs->speed_hz) - 1;
+ else
+ bclkdiv = (mps->mclk / 1000000) - 1; /* default 1MHz */
+
+ ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8));
+ out_be32(&psc->ccr, ccr);
+ mps->bits_per_word = cs->bits_per_word;
+
+ if (mps->cs_control)
+ mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0);
+}
+
+static void mpc512x_psc_spi_deactivate_cs(struct spi_device *spi)
+{
+ struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master);
+
+ if (mps->cs_control)
+ mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
+
+}
+
+/* extract and scale size field in txsz or rxsz */
+#define MPC512x_PSC_FIFO_SZ(sz) ((sz & 0x7ff) << 2);
+
+#define EOFBYTE 1
+
+static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master);
+ struct mpc52xx_psc __iomem *psc = mps->psc;
+ struct mpc512x_psc_fifo __iomem *fifo = mps->fifo;
+ size_t len = t->len;
+ u8 *tx_buf = (u8 *)t->tx_buf;
+ u8 *rx_buf = (u8 *)t->rx_buf;
+
+ if (!tx_buf && !rx_buf && t->len)
+ return -EINVAL;
+
+ /* Zero MR2 */
+ in_8(&psc->mode);
+ out_8(&psc->mode, 0x0);
+
+ while (len) {
+ int count;
+ int i;
+ u8 data;
+ size_t fifosz;
+ int rxcount;
+
+ /*
+ * The number of bytes that can be sent at a time
+ * depends on the fifo size.
+ */
+ fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->txsz));
+ count = min(fifosz, len);
+
+ for (i = count; i > 0; i--) {
+ data = tx_buf ? *tx_buf++ : 0;
+ if (len == EOFBYTE)
+ setbits32(&fifo->txcmd, MPC512x_PSC_FIFO_EOF);
+ out_8(&fifo->txdata_8, data);
+ len--;
+ }
+
+ INIT_COMPLETION(mps->done);
+
+ /* interrupt on tx fifo empty */
+ out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY);
+ out_be32(&fifo->tximr, MPC512x_PSC_FIFO_EMPTY);
+
+ /* enable transmiter/receiver */
+ out_8(&psc->command,
+ MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
+
+ wait_for_completion(&mps->done);
+
+ mdelay(1);
+
+ /* rx fifo should have count bytes in it */
+ rxcount = in_be32(&fifo->rxcnt);
+ if (rxcount != count)
+ mdelay(1);
+
+ rxcount = in_be32(&fifo->rxcnt);
+ if (rxcount != count) {
+ dev_warn(&spi->dev, "expected %d bytes in rx fifo "
+ "but got %d\n", count, rxcount);
+ }
+
+ rxcount = min(rxcount, count);
+ for (i = rxcount; i > 0; i--) {
+ data = in_8(&fifo->rxdata_8);
+ if (rx_buf)
+ *rx_buf++ = data;
+ }
+ while (in_be32(&fifo->rxcnt)) {
+ in_8(&fifo->rxdata_8);
+ }
+
+ out_8(&psc->command,
+ MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
+ }
+ /* disable transmiter/receiver and fifo interrupt */
+ out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
+ out_be32(&fifo->tximr, 0);
+ return 0;
+}
+
+static void mpc512x_psc_spi_work(struct work_struct *work)
+{
+ struct mpc512x_psc_spi *mps = container_of(work,
+ struct mpc512x_psc_spi,
+ work);
+
+ spin_lock_irq(&mps->lock);
+ mps->busy = 1;
+ while (!list_empty(&mps->queue)) {
+ struct spi_message *m;
+ struct spi_device *spi;
+ struct spi_transfer *t = NULL;
+ unsigned cs_change;
+ int status;
+
+ m = container_of(mps->queue.next, struct spi_message, queue);
+ list_del_init(&m->queue);
+ spin_unlock_irq(&mps->lock);
+
+ spi = m->spi;
+ cs_change = 1;
+ status = 0;
+ list_for_each_entry(t, &m->transfers, transfer_list) {
+ if (t->bits_per_word || t->speed_hz) {
+ status = mpc512x_psc_spi_transfer_setup(spi, t);
+ if (status < 0)
+ break;
+ }
+
+ if (cs_change)
+ mpc512x_psc_spi_activate_cs(spi);
+ cs_change = t->cs_change;
+
+ status = mpc512x_psc_spi_transfer_rxtx(spi, t);
+ if (status)
+ break;
+ m->actual_length += t->len;
+
+ if (t->delay_usecs)
+ udelay(t->delay_usecs);
+
+ if (cs_change)
+ mpc512x_psc_spi_deactivate_cs(spi);
+ }
+
+ m->status = status;
+ m->complete(m->context);
+
+ if (status || !cs_change)
+ mpc512x_psc_spi_deactivate_cs(spi);
+
+ mpc512x_psc_spi_transfer_setup(spi, NULL);
+
+ spin_lock_irq(&mps->lock);
+ }
+ mps->busy = 0;
+ spin_unlock_irq(&mps->lock);
+}
+
+static int mpc512x_psc_spi_setup(struct spi_device *spi)
+{
+ struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master);
+ struct mpc512x_psc_spi_cs *cs = spi->controller_state;
+ unsigned long flags;
+
+ if (spi->bits_per_word % 8)
+ return -EINVAL;
+
+ if (!cs) {
+ cs = kzalloc(sizeof *cs, GFP_KERNEL);
+ if (!cs)
+ return -ENOMEM;
+ spi->controller_state = cs;
+ }
+
+ cs->bits_per_word = spi->bits_per_word;
+ cs->speed_hz = spi->max_speed_hz;
+
+ spin_lock_irqsave(&mps->lock, flags);
+ if (!mps->busy)
+ mpc512x_psc_spi_deactivate_cs(spi);
+ spin_unlock_irqrestore(&mps->lock, flags);
+
+ return 0;
+}
+
+static int mpc512x_psc_spi_transfer(struct spi_device *spi,
+ struct spi_message *m)
+{
+ struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master);
+ unsigned long flags;
+
+ m->actual_length = 0;
+ m->status = -EINPROGRESS;
+
+ spin_lock_irqsave(&mps->lock, flags);
+ list_add_tail(&m->queue, &mps->queue);
+ queue_work(mps->workqueue, &mps->work);
+ spin_unlock_irqrestore(&mps->lock, flags);
+
+ return 0;
+}
+
+static void mpc512x_psc_spi_cleanup(struct spi_device *spi)
+{
+ kfree(spi->controller_state);
+}
+
+static int mpc512x_psc_spi_port_config(struct spi_master *master,
+ struct mpc512x_psc_spi *mps)
+{
+ struct mpc52xx_psc __iomem *psc = mps->psc;
+ struct mpc512x_psc_fifo __iomem *fifo = mps->fifo;
+ struct clk *spiclk;
+ int ret = 0;
+ char name[32];
+ u32 sicr;
+ u32 ccr;
+ u16 bclkdiv;
+
+ sprintf(name, "psc%d_mclk", master->bus_num);
+ spiclk = clk_get(&master->dev, name);
+ clk_enable(spiclk);
+ mps->mclk = clk_get_rate(spiclk);
+ clk_put(spiclk);
+
+ /* Reset the PSC into a known state */
+ out_8(&psc->command, MPC52xx_PSC_RST_RX);
+ out_8(&psc->command, MPC52xx_PSC_RST_TX);
+ out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
+
+ /* Disable psc interrupts all useful interrupts are in fifo */
+ out_be16(&psc->isr_imr.imr, 0);
+
+ /* Disable fifo interrupts, will be enabled later */
+ out_be32(&fifo->tximr, 0);
+ out_be32(&fifo->rximr, 0);
+
+ /* Setup fifo slice address and size */
+ /*out_be32(&fifo->txsz, 0x0fe00004);*/
+ /*out_be32(&fifo->rxsz, 0x0ff00004);*/
+
+ sicr = 0x01000000 | /* SIM = 0001 -- 8 bit */
+ 0x00800000 | /* GenClk = 1 -- internal clk */
+ 0x00008000 | /* SPI = 1 */
+ 0x00004000 | /* MSTR = 1 -- SPI master */
+ 0x00000800; /* UseEOF = 1 -- SS low until EOF */
+
+ out_be32(&psc->sicr, sicr);
+
+ ccr = in_be32(&psc->ccr);
+ ccr &= 0xFF000000;
+ bclkdiv = (mps->mclk / 1000000) - 1; /* default 1MHz */
+ ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8));
+ out_be32(&psc->ccr, ccr);
+
+ /* Set 2ms DTL delay */
+ out_8(&psc->ctur, 0x00);
+ out_8(&psc->ctlr, 0x82);
+
+ /* we don't use the alarms */
+ out_be32(&fifo->rxalarm, 0xfff);
+ out_be32(&fifo->txalarm, 0);
+
+ /* Enable FIFO slices for Rx/Tx */
+ out_be32(&fifo->rxcmd,
+ MPC512x_PSC_FIFO_ENABLE_SLICE | MPC512x_PSC_FIFO_ENABLE_DMA);
+ out_be32(&fifo->txcmd,
+ MPC512x_PSC_FIFO_ENABLE_SLICE | MPC512x_PSC_FIFO_ENABLE_DMA);
+
+ mps->bits_per_word = 8;
+
+ return ret;
+}
+
+static irqreturn_t mpc512x_psc_spi_isr(int irq, void *dev_id)
+{
+ struct mpc512x_psc_spi *mps = (struct mpc512x_psc_spi *)dev_id;
+ struct mpc512x_psc_fifo __iomem *fifo = mps->fifo;
+
+ /* clear interrupt and wake up the work queue */
+ if (in_be32(&fifo->txisr) &
+ in_be32(&fifo->tximr) & MPC512x_PSC_FIFO_EMPTY) {
+ out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY);
+ out_be32(&fifo->tximr, 0);
+ complete(&mps->done);
+ return IRQ_HANDLED;
+ }
+ return IRQ_NONE;
+}
+
+/* bus_num is used only for the case dev->platform_data == NULL */
+static int __init mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr,
+ u32 size, unsigned int irq,
+ s16 bus_num)
+{
+ struct fsl_spi_platform_data *pdata = dev->platform_data;
+ struct mpc512x_psc_spi *mps;
+ struct spi_master *master;
+ int ret;
+ void *tempp;
+
+ master = spi_alloc_master(dev, sizeof *mps);
+ if (master == NULL)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, master);
+ mps = spi_master_get_devdata(master);
+ mps->irq = irq;
+
+ if (pdata == NULL) {
+ dev_err(dev, "probe called without platform data, no "
+ "cs_control function will be called\n");
+ mps->cs_control = NULL;
+ mps->sysclk = 0;
+ master->bus_num = bus_num;
+ master->num_chipselect = 255;
+ } else {
+ mps->cs_control = pdata->cs_control;
+ mps->sysclk = pdata->sysclk;
+ master->bus_num = pdata->bus_num;
+ master->num_chipselect = pdata->max_chipselect;
+ }
+
+ master->setup = mpc512x_psc_spi_setup;
+ master->transfer = mpc512x_psc_spi_transfer;
+ master->cleanup = mpc512x_psc_spi_cleanup;
+
+ tempp = ioremap(regaddr, size);
+ if (!tempp) {
+ dev_err(dev, "could not ioremap I/O port range\n");
+ ret = -EFAULT;
+ goto free_master;
+ }
+ mps->psc = tempp;
+ mps->fifo =
+ (struct mpc512x_psc_fifo *)(tempp + sizeof(struct mpc52xx_psc));
+
+ ret = request_irq(mps->irq, mpc512x_psc_spi_isr, IRQF_SHARED,
+ "mpc512x-psc-spi", mps);
+ if (ret)
+ goto free_master;
+
+ ret = mpc512x_psc_spi_port_config(master, mps);
+ if (ret < 0)
+ goto free_irq;
+
+ spin_lock_init(&mps->lock);
+ init_completion(&mps->done);
+ INIT_WORK(&mps->work, mpc512x_psc_spi_work);
+ INIT_LIST_HEAD(&mps->queue);
+
+ mps->workqueue =
+ create_singlethread_workqueue(dev_name(master->dev.parent));
+ if (mps->workqueue == NULL) {
+ ret = -EBUSY;
+ goto free_irq;
+ }
+
+ ret = spi_register_master(master);
+ if (ret < 0)
+ goto unreg_master;
+
+ return ret;
+
+unreg_master:
+ destroy_workqueue(mps->workqueue);
+free_irq:
+ free_irq(mps->irq, mps);
+free_master:
+ if (mps->psc)
+ iounmap(mps->psc);
+ spi_master_put(master);
+
+ return ret;
+}
+
+static int __exit mpc512x_psc_spi_do_remove(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct mpc512x_psc_spi *mps = spi_master_get_devdata(master);
+
+ flush_workqueue(mps->workqueue);
+ destroy_workqueue(mps->workqueue);
+ spi_unregister_master(master);
+ free_irq(mps->irq, mps);
+ if (mps->psc)
+ iounmap(mps->psc);
+
+ return 0;
+}
+
+static int __init mpc512x_psc_spi_of_probe(struct of_device *op,
+ const struct of_device_id *match)
+{
+ const u32 *regaddr_p;
+ u64 regaddr64, size64;
+ s16 id = -1;
+
+ regaddr_p = of_get_address(op->node, 0, &size64, NULL);
+ if (!regaddr_p) {
+ dev_err(&op->dev, "Invalid PSC address\n");
+ return -EINVAL;
+ }
+ regaddr64 = of_translate_address(op->node, regaddr_p);
+
+ /* get PSC id (0..11, used by port_config) */
+ if (op->dev.platform_data == NULL) {
+ const u32 *psc_nump;
+
+ psc_nump = of_get_property(op->node, "cell-index", NULL);
+ if (!psc_nump || *psc_nump > 11) {
+ dev_err(&op->dev, "mpc512x_psc_spi: Device node %s "
+ "has invalid cell-index property\n",
+ op->node->full_name);
+ return -EINVAL;
+ }
+ id = *psc_nump;
+ }
+
+ return mpc512x_psc_spi_do_probe(&op->dev, (u32) regaddr64, (u32) size64,
+ irq_of_parse_and_map(op->node, 0), id);
+}
+
+static int __exit mpc512x_psc_spi_of_remove(struct of_device *op)
+{
+ return mpc512x_psc_spi_do_remove(&op->dev);
+}
+
+static struct of_device_id mpc512x_psc_spi_of_match[] = {
+ { .compatible = "fsl,mpc5121-psc-spi", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, mpc512x_psc_spi_of_match);
+
+static struct of_platform_driver mpc512x_psc_spi_of_driver = {
+ .match_table = mpc512x_psc_spi_of_match,
+ .probe = mpc512x_psc_spi_of_probe,
+ .remove = __exit_p(mpc512x_psc_spi_of_remove),
+ .driver = {
+ .name = "mpc512x-psc-spi",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init mpc512x_psc_spi_init(void)
+{
+ return of_register_platform_driver(&mpc512x_psc_spi_of_driver);
+}
+module_init(mpc512x_psc_spi_init);
+
+static void __exit mpc512x_psc_spi_exit(void)
+{
+ of_unregister_platform_driver(&mpc512x_psc_spi_of_driver);
+}
+module_exit(mpc512x_psc_spi_exit);
+
+MODULE_AUTHOR("John Rigby");
+MODULE_DESCRIPTION("MPC512x PSC SPI Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
index e0de0d0..b3a94ca 100644
--- a/drivers/spi/omap2_mcspi.c
+++ b/drivers/spi/omap2_mcspi.c
@@ -38,7 +38,7 @@
#include <plat/dma.h>
#include <plat/clock.h>
-
+#include <plat/mcspi.h>
#define OMAP2_MCSPI_MAX_FREQ 48000000
@@ -113,7 +113,7 @@
/* use PIO for small transfers, avoiding DMA setup/teardown overhead and
* cache operations; better heuristics consider wordsize and bitrate.
*/
-#define DMA_MIN_BYTES 8
+#define DMA_MIN_BYTES 160
struct omap2_mcspi {
@@ -229,6 +229,8 @@
l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0;
mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l);
+ /* Flash post-writes */
+ mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
}
static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
@@ -303,11 +305,14 @@
unsigned int count, c;
unsigned long base, tx_reg, rx_reg;
int word_len, data_type, element_count;
+ int elements;
+ u32 l;
u8 * rx;
const u8 * tx;
mcspi = spi_master_get_devdata(spi->master);
mcspi_dma = &mcspi->dma_channels[spi->chip_select];
+ l = mcspi_cached_chconf0(spi);
count = xfer->len;
c = count;
@@ -346,8 +351,12 @@
}
if (rx != NULL) {
+ elements = element_count - 1;
+ if (l & OMAP2_MCSPI_CHCONF_TURBO)
+ elements--;
+
omap_set_dma_transfer_params(mcspi_dma->dma_rx_channel,
- data_type, element_count - 1, 1,
+ data_type, elements, 1,
OMAP_DMA_SYNC_ELEMENT,
mcspi_dma->dma_rx_sync_dev, 1);
@@ -379,17 +388,42 @@
wait_for_completion(&mcspi_dma->dma_rx_completion);
dma_unmap_single(NULL, xfer->rx_dma, count, DMA_FROM_DEVICE);
omap2_mcspi_set_enable(spi, 0);
+
+ if (l & OMAP2_MCSPI_CHCONF_TURBO) {
+
+ if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
+ & OMAP2_MCSPI_CHSTAT_RXS)) {
+ u32 w;
+
+ w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
+ if (word_len <= 8)
+ ((u8 *)xfer->rx_buf)[elements++] = w;
+ else if (word_len <= 16)
+ ((u16 *)xfer->rx_buf)[elements++] = w;
+ else /* word_len <= 32 */
+ ((u32 *)xfer->rx_buf)[elements++] = w;
+ } else {
+ dev_err(&spi->dev,
+ "DMA RX penultimate word empty");
+ count -= (word_len <= 8) ? 2 :
+ (word_len <= 16) ? 4 :
+ /* word_len <= 32 */ 8;
+ omap2_mcspi_set_enable(spi, 1);
+ return count;
+ }
+ }
+
if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
& OMAP2_MCSPI_CHSTAT_RXS)) {
u32 w;
w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
if (word_len <= 8)
- ((u8 *)xfer->rx_buf)[element_count - 1] = w;
+ ((u8 *)xfer->rx_buf)[elements] = w;
else if (word_len <= 16)
- ((u16 *)xfer->rx_buf)[element_count - 1] = w;
+ ((u16 *)xfer->rx_buf)[elements] = w;
else /* word_len <= 32 */
- ((u32 *)xfer->rx_buf)[element_count - 1] = w;
+ ((u32 *)xfer->rx_buf)[elements] = w;
} else {
dev_err(&spi->dev, "DMA RX last word empty");
count -= (word_len <= 8) ? 1 :
@@ -433,7 +467,6 @@
word_len = cs->word_len;
l = mcspi_cached_chconf0(spi);
- l &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
/* We store the pre-calculated register addresses on stack to speed
* up the transfer loop. */
@@ -468,11 +501,26 @@
dev_err(&spi->dev, "RXS timed out\n");
goto out;
}
- /* prevent last RX_ONLY read from triggering
- * more word i/o: switch to rx+tx
- */
- if (c == 0 && tx == NULL)
- mcspi_write_chconf0(spi, l);
+
+ if (c == 1 && tx == NULL &&
+ (l & OMAP2_MCSPI_CHCONF_TURBO)) {
+ omap2_mcspi_set_enable(spi, 0);
+ *rx++ = __raw_readl(rx_reg);
+#ifdef VERBOSE
+ dev_dbg(&spi->dev, "read-%d %02x\n",
+ word_len, *(rx - 1));
+#endif
+ if (mcspi_wait_for_reg_bit(chstat_reg,
+ OMAP2_MCSPI_CHSTAT_RXS) < 0) {
+ dev_err(&spi->dev,
+ "RXS timed out\n");
+ goto out;
+ }
+ c = 0;
+ } else if (c == 0 && tx == NULL) {
+ omap2_mcspi_set_enable(spi, 0);
+ }
+
*rx++ = __raw_readl(rx_reg);
#ifdef VERBOSE
dev_dbg(&spi->dev, "read-%d %02x\n",
@@ -506,11 +554,26 @@
dev_err(&spi->dev, "RXS timed out\n");
goto out;
}
- /* prevent last RX_ONLY read from triggering
- * more word i/o: switch to rx+tx
- */
- if (c == 0 && tx == NULL)
- mcspi_write_chconf0(spi, l);
+
+ if (c == 2 && tx == NULL &&
+ (l & OMAP2_MCSPI_CHCONF_TURBO)) {
+ omap2_mcspi_set_enable(spi, 0);
+ *rx++ = __raw_readl(rx_reg);
+#ifdef VERBOSE
+ dev_dbg(&spi->dev, "read-%d %04x\n",
+ word_len, *(rx - 1));
+#endif
+ if (mcspi_wait_for_reg_bit(chstat_reg,
+ OMAP2_MCSPI_CHSTAT_RXS) < 0) {
+ dev_err(&spi->dev,
+ "RXS timed out\n");
+ goto out;
+ }
+ c = 0;
+ } else if (c == 0 && tx == NULL) {
+ omap2_mcspi_set_enable(spi, 0);
+ }
+
*rx++ = __raw_readl(rx_reg);
#ifdef VERBOSE
dev_dbg(&spi->dev, "read-%d %04x\n",
@@ -544,11 +607,26 @@
dev_err(&spi->dev, "RXS timed out\n");
goto out;
}
- /* prevent last RX_ONLY read from triggering
- * more word i/o: switch to rx+tx
- */
- if (c == 0 && tx == NULL)
- mcspi_write_chconf0(spi, l);
+
+ if (c == 4 && tx == NULL &&
+ (l & OMAP2_MCSPI_CHCONF_TURBO)) {
+ omap2_mcspi_set_enable(spi, 0);
+ *rx++ = __raw_readl(rx_reg);
+#ifdef VERBOSE
+ dev_dbg(&spi->dev, "read-%d %08x\n",
+ word_len, *(rx - 1));
+#endif
+ if (mcspi_wait_for_reg_bit(chstat_reg,
+ OMAP2_MCSPI_CHSTAT_RXS) < 0) {
+ dev_err(&spi->dev,
+ "RXS timed out\n");
+ goto out;
+ }
+ c = 0;
+ } else if (c == 0 && tx == NULL) {
+ omap2_mcspi_set_enable(spi, 0);
+ }
+
*rx++ = __raw_readl(rx_reg);
#ifdef VERBOSE
dev_dbg(&spi->dev, "read-%d %08x\n",
@@ -568,6 +646,7 @@
dev_err(&spi->dev, "EOT timed out\n");
}
out:
+ omap2_mcspi_set_enable(spi, 1);
return count - c;
}
@@ -755,7 +834,6 @@
struct omap2_mcspi_cs *cs;
mcspi = spi_master_get_devdata(spi->master);
- mcspi_dma = &mcspi->dma_channels[spi->chip_select];
if (spi->controller_state) {
/* Unlink controller state from context save list */
@@ -765,13 +843,17 @@
kfree(spi->controller_state);
}
- if (mcspi_dma->dma_rx_channel != -1) {
- omap_free_dma(mcspi_dma->dma_rx_channel);
- mcspi_dma->dma_rx_channel = -1;
- }
- if (mcspi_dma->dma_tx_channel != -1) {
- omap_free_dma(mcspi_dma->dma_tx_channel);
- mcspi_dma->dma_tx_channel = -1;
+ if (spi->chip_select < spi->master->num_chipselect) {
+ mcspi_dma = &mcspi->dma_channels[spi->chip_select];
+
+ if (mcspi_dma->dma_rx_channel != -1) {
+ omap_free_dma(mcspi_dma->dma_rx_channel);
+ mcspi_dma->dma_rx_channel = -1;
+ }
+ if (mcspi_dma->dma_tx_channel != -1) {
+ omap_free_dma(mcspi_dma->dma_tx_channel);
+ mcspi_dma->dma_tx_channel = -1;
+ }
}
}
@@ -797,6 +879,7 @@
struct spi_transfer *t = NULL;
int cs_active = 0;
struct omap2_mcspi_cs *cs;
+ struct omap2_mcspi_device_config *cd;
int par_override = 0;
int status = 0;
u32 chconf;
@@ -809,6 +892,7 @@
spi = m->spi;
cs = spi->controller_state;
+ cd = spi->controller_data;
omap2_mcspi_set_enable(spi, 1);
list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -832,10 +916,19 @@
chconf = mcspi_cached_chconf0(spi);
chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
+ chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
+
if (t->tx_buf == NULL)
chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
else if (t->rx_buf == NULL)
chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
+
+ if (cd && cd->turbo_mode && t->tx_buf == NULL) {
+ /* Turbo mode is for more than one word */
+ if (t->len > ((cs->word_len + 7) >> 3))
+ chconf |= OMAP2_MCSPI_CHCONF_TURBO;
+ }
+
mcspi_write_chconf0(spi, chconf);
if (t->len) {
diff --git a/drivers/spi/spi_bitbang_txrx.h b/drivers/spi/spi_bitbang_txrx.h
new file mode 100644
index 0000000..fc033bb
--- /dev/null
+++ b/drivers/spi/spi_bitbang_txrx.h
@@ -0,0 +1,93 @@
+/*
+ * Mix this utility code with some glue code to get one of several types of
+ * simple SPI master driver. Two do polled word-at-a-time I/O:
+ *
+ * - GPIO/parport bitbangers. Provide chipselect() and txrx_word[](),
+ * expanding the per-word routines from the inline templates below.
+ *
+ * - Drivers for controllers resembling bare shift registers. Provide
+ * chipselect() and txrx_word[](), with custom setup()/cleanup() methods
+ * that use your controller's clock and chipselect registers.
+ *
+ * Some hardware works well with requests at spi_transfer scope:
+ *
+ * - Drivers leveraging smarter hardware, with fifos or DMA; or for half
+ * duplex (MicroWire) controllers. Provide chipselect() and txrx_bufs(),
+ * and custom setup()/cleanup() methods.
+ */
+
+/*
+ * The code that knows what GPIO pins do what should have declared four
+ * functions, ideally as inlines, before including this header:
+ *
+ * void setsck(struct spi_device *, int is_on);
+ * void setmosi(struct spi_device *, int is_on);
+ * int getmiso(struct spi_device *);
+ * void spidelay(unsigned);
+ *
+ * setsck()'s is_on parameter is a zero/nonzero boolean.
+ *
+ * setmosi()'s is_on parameter is a zero/nonzero boolean.
+ *
+ * getmiso() is required to return 0 or 1 only. Any other value is invalid
+ * and will result in improper operation.
+ *
+ * A non-inlined routine would call bitbang_txrx_*() routines. The
+ * main loop could easily compile down to a handful of instructions,
+ * especially if the delay is a NOP (to run at peak speed).
+ *
+ * Since this is software, the timings may not be exactly what your board's
+ * chips need ... there may be several reasons you'd need to tweak timings
+ * in these routines, not just make to make it faster or slower to match a
+ * particular CPU clock rate.
+ */
+
+static inline u32
+bitbang_txrx_be_cpha0(struct spi_device *spi,
+ unsigned nsecs, unsigned cpol,
+ u32 word, u8 bits)
+{
+ /* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */
+
+ /* clock starts at inactive polarity */
+ for (word <<= (32 - bits); likely(bits); bits--) {
+
+ /* setup MSB (to slave) on trailing edge */
+ setmosi(spi, word & (1 << 31));
+ spidelay(nsecs); /* T(setup) */
+
+ setsck(spi, !cpol);
+ spidelay(nsecs);
+
+ /* sample MSB (from slave) on leading edge */
+ word <<= 1;
+ word |= getmiso(spi);
+ setsck(spi, cpol);
+ }
+ return word;
+}
+
+static inline u32
+bitbang_txrx_be_cpha1(struct spi_device *spi,
+ unsigned nsecs, unsigned cpol,
+ u32 word, u8 bits)
+{
+ /* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */
+
+ /* clock starts at inactive polarity */
+ for (word <<= (32 - bits); likely(bits); bits--) {
+
+ /* setup MSB (to slave) on leading edge */
+ setsck(spi, !cpol);
+ setmosi(spi, word & (1 << 31));
+ spidelay(nsecs); /* T(setup) */
+
+ setsck(spi, cpol);
+ spidelay(nsecs);
+
+ /* sample MSB (from slave) on trailing edge */
+ word <<= 1;
+ word |= getmiso(spi);
+ }
+ return word;
+}
diff --git a/drivers/spi/spi_butterfly.c b/drivers/spi/spi_butterfly.c
index c218486..8b52812 100644
--- a/drivers/spi/spi_butterfly.c
+++ b/drivers/spi/spi_butterfly.c
@@ -149,8 +149,7 @@
#define spidelay(X) do{}while(0)
//#define spidelay ndelay
-#define EXPAND_BITBANG_TXRX
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
static u32
butterfly_txrx_word_mode0(struct spi_device *spi,
diff --git a/drivers/spi/spi_gpio.c b/drivers/spi/spi_gpio.c
index 26bd03e..7edbd58 100644
--- a/drivers/spi/spi_gpio.c
+++ b/drivers/spi/spi_gpio.c
@@ -127,8 +127,7 @@
*/
#define spidelay(nsecs) do {} while (0)
-#define EXPAND_BITBANG_TXRX
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
/*
* These functions can leverage inline expansion of GPIO calls to shrink
diff --git a/drivers/spi/spi_lm70llp.c b/drivers/spi/spi_lm70llp.c
index 568c781..86fb7b5 100644
--- a/drivers/spi/spi_lm70llp.c
+++ b/drivers/spi/spi_lm70llp.c
@@ -174,8 +174,7 @@
}
/*--------------------------------------------------------------------*/
-#define EXPAND_BITBANG_TXRX 1
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
static void lm70_chipselect(struct spi_device *spi, int value)
{
diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c
index 75b7f8c..ffa111a 100644
--- a/drivers/spi/spi_mpc8xxx.c
+++ b/drivers/spi/spi_mpc8xxx.c
@@ -241,7 +241,6 @@
/* Turn off SPI unit prior changing mode */
mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
- mpc8xxx_spi_write_reg(mode, cs->hw_mode);
/* When in CPM mode, we need to reinit tx and rx. */
if (mspi->flags & SPI_CPM_MODE) {
@@ -258,7 +257,7 @@
}
}
}
-
+ mpc8xxx_spi_write_reg(mode, cs->hw_mode);
local_irq_restore(flags);
}
@@ -287,11 +286,75 @@
}
}
+static int
+mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
+ struct spi_device *spi,
+ struct mpc8xxx_spi *mpc8xxx_spi,
+ int bits_per_word)
+{
+ cs->rx_shift = 0;
+ cs->tx_shift = 0;
+ if (bits_per_word <= 8) {
+ cs->get_rx = mpc8xxx_spi_rx_buf_u8;
+ cs->get_tx = mpc8xxx_spi_tx_buf_u8;
+ if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
+ cs->rx_shift = 16;
+ cs->tx_shift = 24;
+ }
+ } else if (bits_per_word <= 16) {
+ cs->get_rx = mpc8xxx_spi_rx_buf_u16;
+ cs->get_tx = mpc8xxx_spi_tx_buf_u16;
+ if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
+ cs->rx_shift = 16;
+ cs->tx_shift = 16;
+ }
+ } else if (bits_per_word <= 32) {
+ cs->get_rx = mpc8xxx_spi_rx_buf_u32;
+ cs->get_tx = mpc8xxx_spi_tx_buf_u32;
+ } else
+ return -EINVAL;
+
+ if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE &&
+ spi->mode & SPI_LSB_FIRST) {
+ cs->tx_shift = 0;
+ if (bits_per_word <= 8)
+ cs->rx_shift = 8;
+ else
+ cs->rx_shift = 0;
+ }
+ mpc8xxx_spi->rx_shift = cs->rx_shift;
+ mpc8xxx_spi->tx_shift = cs->tx_shift;
+ mpc8xxx_spi->get_rx = cs->get_rx;
+ mpc8xxx_spi->get_tx = cs->get_tx;
+
+ return bits_per_word;
+}
+
+static int
+mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs,
+ struct spi_device *spi,
+ int bits_per_word)
+{
+ /* QE uses Little Endian for words > 8
+ * so transform all words > 8 into 8 bits
+ * Unfortnatly that doesn't work for LSB so
+ * reject these for now */
+ /* Note: 32 bits word, LSB works iff
+ * tfcr/rfcr is set to CPMFCR_GBL */
+ if (spi->mode & SPI_LSB_FIRST &&
+ bits_per_word > 8)
+ return -EINVAL;
+ if (bits_per_word > 8)
+ return 8; /* pretend its 8 bits */
+ return bits_per_word;
+}
+
static
int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
{
struct mpc8xxx_spi *mpc8xxx_spi;
- u8 bits_per_word, pm;
+ int bits_per_word;
+ u8 pm;
u32 hz;
struct spi_mpc8xxx_cs *cs = spi->controller_state;
@@ -317,41 +380,16 @@
if (!hz)
hz = spi->max_speed_hz;
- cs->rx_shift = 0;
- cs->tx_shift = 0;
- if (bits_per_word <= 8) {
- cs->get_rx = mpc8xxx_spi_rx_buf_u8;
- cs->get_tx = mpc8xxx_spi_tx_buf_u8;
- if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
- cs->rx_shift = 16;
- cs->tx_shift = 24;
- }
- } else if (bits_per_word <= 16) {
- cs->get_rx = mpc8xxx_spi_rx_buf_u16;
- cs->get_tx = mpc8xxx_spi_tx_buf_u16;
- if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
- cs->rx_shift = 16;
- cs->tx_shift = 16;
- }
- } else if (bits_per_word <= 32) {
- cs->get_rx = mpc8xxx_spi_rx_buf_u32;
- cs->get_tx = mpc8xxx_spi_tx_buf_u32;
- } else
- return -EINVAL;
+ if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
+ bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
+ mpc8xxx_spi,
+ bits_per_word);
+ else if (mpc8xxx_spi->flags & SPI_QE)
+ bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
+ bits_per_word);
- if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE &&
- spi->mode & SPI_LSB_FIRST) {
- cs->tx_shift = 0;
- if (bits_per_word <= 8)
- cs->rx_shift = 8;
- else
- cs->rx_shift = 0;
- }
-
- mpc8xxx_spi->rx_shift = cs->rx_shift;
- mpc8xxx_spi->tx_shift = cs->tx_shift;
- mpc8xxx_spi->get_rx = cs->get_rx;
- mpc8xxx_spi->get_tx = cs->get_tx;
+ if (bits_per_word < 0)
+ return bits_per_word;
if (bits_per_word == 32)
bits_per_word = 0;
@@ -438,7 +476,7 @@
dev_err(dev, "unable to map tx dma\n");
return -ENOMEM;
}
- } else {
+ } else if (t->tx_buf) {
mspi->tx_dma = t->tx_dma;
}
@@ -449,7 +487,7 @@
dev_err(dev, "unable to map rx dma\n");
goto err_rx_dma;
}
- } else {
+ } else if (t->rx_buf) {
mspi->rx_dma = t->rx_dma;
}
@@ -477,7 +515,7 @@
if (mspi->map_tx_dma)
dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
- if (mspi->map_tx_dma)
+ if (mspi->map_rx_dma)
dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
mspi->xfer_in_progress = NULL;
}
diff --git a/drivers/spi/spi_s3c24xx_gpio.c b/drivers/spi/spi_s3c24xx_gpio.c
index bbf9371..8979a75 100644
--- a/drivers/spi/spi_s3c24xx_gpio.c
+++ b/drivers/spi/spi_s3c24xx_gpio.c
@@ -58,8 +58,7 @@
#define spidelay(x) ndelay(x)
-#define EXPAND_BITBANG_TXRX
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
static u32 s3c2410_spigpio_txrx_mode0(struct spi_device *spi,
diff --git a/drivers/spi/spi_sh_sci.c b/drivers/spi/spi_sh_sci.c
index a65c12f..a511be7 100644
--- a/drivers/spi/spi_sh_sci.c
+++ b/drivers/spi/spi_sh_sci.c
@@ -78,8 +78,7 @@
#define spidelay(x) ndelay(x)
-#define EXPAND_BITBANG_TXRX
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
static u32 sh_sci_spi_txrx_mode0(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits)
diff --git a/include/linux/amba/pl022.h b/include/linux/amba/pl022.h
index e4836c6b..abf26cc 100644
--- a/include/linux/amba/pl022.h
+++ b/include/linux/amba/pl022.h
@@ -71,6 +71,7 @@
/**
* enum ssp_rx_endian - endianess of Rx FIFO Data
+ * this feature is only available in ST versionf of PL022
*/
enum ssp_rx_endian {
SSP_RX_MSB,
@@ -181,7 +182,8 @@
};
/**
- * enum Microwire - whether Full/Half Duplex
+ * enum ssp_duplex - whether Full/Half Duplex on microwire, only
+ * available in the ST Micro variant.
* @SSP_MICROWIRE_CHANNEL_FULL_DUPLEX: SSPTXD becomes bi-directional,
* SSPRXD not used
* @SSP_MICROWIRE_CHANNEL_HALF_DUPLEX: SSPTXD is an output, SSPRXD is
@@ -193,6 +195,31 @@
};
/**
+ * enum ssp_clkdelay - an optional clock delay on the feedback clock
+ * only available in the ST Micro PL023 variant.
+ * @SSP_FEEDBACK_CLK_DELAY_NONE: no delay, the data coming in from the
+ * slave is sampled directly
+ * @SSP_FEEDBACK_CLK_DELAY_1T: the incoming slave data is sampled with
+ * a delay of T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_2T: dito with a delay if 2T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_3T: dito with a delay if 3T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_4T: dito with a delay if 4T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_5T: dito with a delay if 5T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_6T: dito with a delay if 6T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_7T: dito with a delay if 7T-dt
+ */
+enum ssp_clkdelay {
+ SSP_FEEDBACK_CLK_DELAY_NONE,
+ SSP_FEEDBACK_CLK_DELAY_1T,
+ SSP_FEEDBACK_CLK_DELAY_2T,
+ SSP_FEEDBACK_CLK_DELAY_3T,
+ SSP_FEEDBACK_CLK_DELAY_4T,
+ SSP_FEEDBACK_CLK_DELAY_5T,
+ SSP_FEEDBACK_CLK_DELAY_6T,
+ SSP_FEEDBACK_CLK_DELAY_7T
+};
+
+/**
* CHIP select/deselect commands
*/
enum ssp_chip_select {
@@ -235,6 +262,8 @@
* @ctrl_len: Microwire interface: Control length
* @wait_state: Microwire interface: Wait state
* @duplex: Microwire interface: Full/Half duplex
+ * @clkdelay: on the PL023 variant, the delay in feeback clock cycles
+ * before sampling the incoming line
* @cs_control: function pointer to board-specific function to
* assert/deassert I/O port to control HW generation of devices chip-select.
* @dma_xfer_type: Type of DMA xfer (Mem-to-periph or Periph-to-Periph)
@@ -258,6 +287,7 @@
enum ssp_microwire_ctrl_len ctrl_len;
enum ssp_microwire_wait_state wait_state;
enum ssp_duplex duplex;
+ enum ssp_clkdelay clkdelay;
void (*cs_control) (u32 control);
};
diff --git a/include/linux/spi/spi_bitbang.h b/include/linux/spi/spi_bitbang.h
index 3274c50..f987a2b 100644
--- a/include/linux/spi/spi_bitbang.h
+++ b/include/linux/spi/spi_bitbang.h
@@ -1,24 +1,6 @@
#ifndef __SPI_BITBANG_H
#define __SPI_BITBANG_H
-/*
- * Mix this utility code with some glue code to get one of several types of
- * simple SPI master driver. Two do polled word-at-a-time I/O:
- *
- * - GPIO/parport bitbangers. Provide chipselect() and txrx_word[](),
- * expanding the per-word routines from the inline templates below.
- *
- * - Drivers for controllers resembling bare shift registers. Provide
- * chipselect() and txrx_word[](), with custom setup()/cleanup() methods
- * that use your controller's clock and chipselect registers.
- *
- * Some hardware works well with requests at spi_transfer scope:
- *
- * - Drivers leveraging smarter hardware, with fifos or DMA; or for half
- * duplex (MicroWire) controllers. Provide chipselect() and txrx_bufs(),
- * and custom setup()/cleanup() methods.
- */
-
#include <linux/workqueue.h>
struct spi_bitbang {
@@ -68,86 +50,3 @@
extern int spi_bitbang_stop(struct spi_bitbang *spi);
#endif /* __SPI_BITBANG_H */
-
-/*-------------------------------------------------------------------------*/
-
-#ifdef EXPAND_BITBANG_TXRX
-
-/*
- * The code that knows what GPIO pins do what should have declared four
- * functions, ideally as inlines, before #defining EXPAND_BITBANG_TXRX
- * and including this header:
- *
- * void setsck(struct spi_device *, int is_on);
- * void setmosi(struct spi_device *, int is_on);
- * int getmiso(struct spi_device *);
- * void spidelay(unsigned);
- *
- * setsck()'s is_on parameter is a zero/nonzero boolean.
- *
- * setmosi()'s is_on parameter is a zero/nonzero boolean.
- *
- * getmiso() is required to return 0 or 1 only. Any other value is invalid
- * and will result in improper operation.
- *
- * A non-inlined routine would call bitbang_txrx_*() routines. The
- * main loop could easily compile down to a handful of instructions,
- * especially if the delay is a NOP (to run at peak speed).
- *
- * Since this is software, the timings may not be exactly what your board's
- * chips need ... there may be several reasons you'd need to tweak timings
- * in these routines, not just make to make it faster or slower to match a
- * particular CPU clock rate.
- */
-
-static inline u32
-bitbang_txrx_be_cpha0(struct spi_device *spi,
- unsigned nsecs, unsigned cpol,
- u32 word, u8 bits)
-{
- /* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */
-
- /* clock starts at inactive polarity */
- for (word <<= (32 - bits); likely(bits); bits--) {
-
- /* setup MSB (to slave) on trailing edge */
- setmosi(spi, word & (1 << 31));
- spidelay(nsecs); /* T(setup) */
-
- setsck(spi, !cpol);
- spidelay(nsecs);
-
- /* sample MSB (from slave) on leading edge */
- word <<= 1;
- word |= getmiso(spi);
- setsck(spi, cpol);
- }
- return word;
-}
-
-static inline u32
-bitbang_txrx_be_cpha1(struct spi_device *spi,
- unsigned nsecs, unsigned cpol,
- u32 word, u8 bits)
-{
- /* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */
-
- /* clock starts at inactive polarity */
- for (word <<= (32 - bits); likely(bits); bits--) {
-
- /* setup MSB (to slave) on leading edge */
- setsck(spi, !cpol);
- setmosi(spi, word & (1 << 31));
- spidelay(nsecs); /* T(setup) */
-
- setsck(spi, cpol);
- spidelay(nsecs);
-
- /* sample MSB (from slave) on trailing edge */
- word <<= 1;
- word |= getmiso(spi);
- }
- return word;
-}
-
-#endif /* EXPAND_BITBANG_TXRX */