Merge branch 'topic/sprd' into for-linus
Kconfig and Makefile conflicts so put them in right order (sprd ones after
stm ones)
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/Documentation/devicetree/bindings/dma/sprd-dma.txt b/Documentation/devicetree/bindings/dma/sprd-dma.txt
new file mode 100644
index 0000000..7a10fea
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/sprd-dma.txt
@@ -0,0 +1,41 @@
+* Spreadtrum DMA controller
+
+This binding follows the generic DMA bindings defined in dma.txt.
+
+Required properties:
+- compatible: Should be "sprd,sc9860-dma".
+- reg: Should contain DMA registers location and length.
+- interrupts: Should contain one interrupt shared by all channel.
+- #dma-cells: must be <1>. Used to represent the number of integer
+ cells in the dmas property of client device.
+- #dma-channels : Number of DMA channels supported. Should be 32.
+- clock-names: Should contain the clock of the DMA controller.
+- clocks: Should contain a clock specifier for each entry in clock-names.
+
+Example:
+
+Controller:
+apdma: dma-controller@20100000 {
+ compatible = "sprd,sc9860-dma";
+ reg = <0x20100000 0x4000>;
+ interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ #dma-channels = <32>;
+ clock-names = "enable";
+ clocks = <&clk_ap_ahb_gates 5>;
+};
+
+
+Client:
+DMA clients connected to the Spreadtrum DMA controller must use the format
+described in the dma.txt file, using a two-cell specifier for each channel.
+The two cells in order are:
+1. A phandle pointing to the DMA controller.
+2. The channel id.
+
+spi0: spi@70a00000{
+ ...
+ dma-names = "rx_chn", "tx_chn";
+ dmas = <&apdma 11>, <&apdma 12>;
+ ...
+};
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 4002d1c..27df3e2 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -504,6 +504,14 @@
If you have a board based on STM32 SoC and wish to use the master DMA
say Y here.
+config SPRD_DMA
+ tristate "Spreadtrum DMA support"
+ depends on ARCH_SPRD || COMPILE_TEST
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ help
+ Enable support for the on-chip DMA controller on Spreadtrum platform.
+
config S3C24XX_DMAC
bool "Samsung S3C24XX DMA support"
depends on ARCH_S3C24XX || COMPILE_TEST
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 4d2376f..774546e 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -61,6 +61,7 @@
obj-$(CONFIG_STM32_DMA) += stm32-dma.o
obj-$(CONFIG_STM32_DMAMUX) += stm32-dmamux.o
obj-$(CONFIG_STM32_MDMA) += stm32-mdma.o
+obj-$(CONFIG_SPRD_DMA) += sprd-dma.o
obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
new file mode 100644
index 0000000..b652071
--- /dev/null
+++ b/drivers/dma/sprd-dma.c
@@ -0,0 +1,988 @@
+/*
+ * Copyright (C) 2017 Spreadtrum Communications Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_dma.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include "virt-dma.h"
+
+#define SPRD_DMA_CHN_REG_OFFSET 0x1000
+#define SPRD_DMA_CHN_REG_LENGTH 0x40
+#define SPRD_DMA_MEMCPY_MIN_SIZE 64
+
+/* DMA global registers definition */
+#define SPRD_DMA_GLB_PAUSE 0x0
+#define SPRD_DMA_GLB_FRAG_WAIT 0x4
+#define SPRD_DMA_GLB_REQ_PEND0_EN 0x8
+#define SPRD_DMA_GLB_REQ_PEND1_EN 0xc
+#define SPRD_DMA_GLB_INT_RAW_STS 0x10
+#define SPRD_DMA_GLB_INT_MSK_STS 0x14
+#define SPRD_DMA_GLB_REQ_STS 0x18
+#define SPRD_DMA_GLB_CHN_EN_STS 0x1c
+#define SPRD_DMA_GLB_DEBUG_STS 0x20
+#define SPRD_DMA_GLB_ARB_SEL_STS 0x24
+#define SPRD_DMA_GLB_REQ_UID(uid) (0x4 * ((uid) - 1))
+#define SPRD_DMA_GLB_REQ_UID_OFFSET 0x2000
+
+/* DMA channel registers definition */
+#define SPRD_DMA_CHN_PAUSE 0x0
+#define SPRD_DMA_CHN_REQ 0x4
+#define SPRD_DMA_CHN_CFG 0x8
+#define SPRD_DMA_CHN_INTC 0xc
+#define SPRD_DMA_CHN_SRC_ADDR 0x10
+#define SPRD_DMA_CHN_DES_ADDR 0x14
+#define SPRD_DMA_CHN_FRG_LEN 0x18
+#define SPRD_DMA_CHN_BLK_LEN 0x1c
+#define SPRD_DMA_CHN_TRSC_LEN 0x20
+#define SPRD_DMA_CHN_TRSF_STEP 0x24
+#define SPRD_DMA_CHN_WARP_PTR 0x28
+#define SPRD_DMA_CHN_WARP_TO 0x2c
+#define SPRD_DMA_CHN_LLIST_PTR 0x30
+#define SPRD_DMA_CHN_FRAG_STEP 0x34
+#define SPRD_DMA_CHN_SRC_BLK_STEP 0x38
+#define SPRD_DMA_CHN_DES_BLK_STEP 0x3c
+
+/* SPRD_DMA_CHN_INTC register definition */
+#define SPRD_DMA_INT_MASK GENMASK(4, 0)
+#define SPRD_DMA_INT_CLR_OFFSET 24
+#define SPRD_DMA_FRAG_INT_EN BIT(0)
+#define SPRD_DMA_BLK_INT_EN BIT(1)
+#define SPRD_DMA_TRANS_INT_EN BIT(2)
+#define SPRD_DMA_LIST_INT_EN BIT(3)
+#define SPRD_DMA_CFG_ERR_INT_EN BIT(4)
+
+/* SPRD_DMA_CHN_CFG register definition */
+#define SPRD_DMA_CHN_EN BIT(0)
+#define SPRD_DMA_WAIT_BDONE_OFFSET 24
+#define SPRD_DMA_DONOT_WAIT_BDONE 1
+
+/* SPRD_DMA_CHN_REQ register definition */
+#define SPRD_DMA_REQ_EN BIT(0)
+
+/* SPRD_DMA_CHN_PAUSE register definition */
+#define SPRD_DMA_PAUSE_EN BIT(0)
+#define SPRD_DMA_PAUSE_STS BIT(2)
+#define SPRD_DMA_PAUSE_CNT 0x2000
+
+/* DMA_CHN_WARP_* register definition */
+#define SPRD_DMA_HIGH_ADDR_MASK GENMASK(31, 28)
+#define SPRD_DMA_LOW_ADDR_MASK GENMASK(31, 0)
+#define SPRD_DMA_HIGH_ADDR_OFFSET 4
+
+/* SPRD_DMA_CHN_INTC register definition */
+#define SPRD_DMA_FRAG_INT_STS BIT(16)
+#define SPRD_DMA_BLK_INT_STS BIT(17)
+#define SPRD_DMA_TRSC_INT_STS BIT(18)
+#define SPRD_DMA_LIST_INT_STS BIT(19)
+#define SPRD_DMA_CFGERR_INT_STS BIT(20)
+#define SPRD_DMA_CHN_INT_STS \
+ (SPRD_DMA_FRAG_INT_STS | SPRD_DMA_BLK_INT_STS | \
+ SPRD_DMA_TRSC_INT_STS | SPRD_DMA_LIST_INT_STS | \
+ SPRD_DMA_CFGERR_INT_STS)
+
+/* SPRD_DMA_CHN_FRG_LEN register definition */
+#define SPRD_DMA_SRC_DATAWIDTH_OFFSET 30
+#define SPRD_DMA_DES_DATAWIDTH_OFFSET 28
+#define SPRD_DMA_SWT_MODE_OFFSET 26
+#define SPRD_DMA_REQ_MODE_OFFSET 24
+#define SPRD_DMA_REQ_MODE_MASK GENMASK(1, 0)
+#define SPRD_DMA_FIX_SEL_OFFSET 21
+#define SPRD_DMA_FIX_EN_OFFSET 20
+#define SPRD_DMA_LLIST_END_OFFSET 19
+#define SPRD_DMA_FRG_LEN_MASK GENMASK(16, 0)
+
+/* SPRD_DMA_CHN_BLK_LEN register definition */
+#define SPRD_DMA_BLK_LEN_MASK GENMASK(16, 0)
+
+/* SPRD_DMA_CHN_TRSC_LEN register definition */
+#define SPRD_DMA_TRSC_LEN_MASK GENMASK(27, 0)
+
+/* SPRD_DMA_CHN_TRSF_STEP register definition */
+#define SPRD_DMA_DEST_TRSF_STEP_OFFSET 16
+#define SPRD_DMA_SRC_TRSF_STEP_OFFSET 0
+#define SPRD_DMA_TRSF_STEP_MASK GENMASK(15, 0)
+
+#define SPRD_DMA_SOFTWARE_UID 0
+
+/*
+ * enum sprd_dma_req_mode: define the DMA request mode
+ * @SPRD_DMA_FRAG_REQ: fragment request mode
+ * @SPRD_DMA_BLK_REQ: block request mode
+ * @SPRD_DMA_TRANS_REQ: transaction request mode
+ * @SPRD_DMA_LIST_REQ: link-list request mode
+ *
+ * We have 4 types request mode: fragment mode, block mode, transaction mode
+ * and linklist mode. One transaction can contain several blocks, one block can
+ * contain several fragments. Link-list mode means we can save several DMA
+ * configuration into one reserved memory, then DMA can fetch each DMA
+ * configuration automatically to start transfer.
+ */
+enum sprd_dma_req_mode {
+ SPRD_DMA_FRAG_REQ,
+ SPRD_DMA_BLK_REQ,
+ SPRD_DMA_TRANS_REQ,
+ SPRD_DMA_LIST_REQ,
+};
+
+/*
+ * enum sprd_dma_int_type: define the DMA interrupt type
+ * @SPRD_DMA_NO_INT: do not need generate DMA interrupts.
+ * @SPRD_DMA_FRAG_INT: fragment done interrupt when one fragment request
+ * is done.
+ * @SPRD_DMA_BLK_INT: block done interrupt when one block request is done.
+ * @SPRD_DMA_BLK_FRAG_INT: block and fragment interrupt when one fragment
+ * or one block request is done.
+ * @SPRD_DMA_TRANS_INT: tansaction done interrupt when one transaction
+ * request is done.
+ * @SPRD_DMA_TRANS_FRAG_INT: transaction and fragment interrupt when one
+ * transaction request or fragment request is done.
+ * @SPRD_DMA_TRANS_BLK_INT: transaction and block interrupt when one
+ * transaction request or block request is done.
+ * @SPRD_DMA_LIST_INT: link-list done interrupt when one link-list request
+ * is done.
+ * @SPRD_DMA_CFGERR_INT: configure error interrupt when configuration is
+ * incorrect.
+ */
+enum sprd_dma_int_type {
+ SPRD_DMA_NO_INT,
+ SPRD_DMA_FRAG_INT,
+ SPRD_DMA_BLK_INT,
+ SPRD_DMA_BLK_FRAG_INT,
+ SPRD_DMA_TRANS_INT,
+ SPRD_DMA_TRANS_FRAG_INT,
+ SPRD_DMA_TRANS_BLK_INT,
+ SPRD_DMA_LIST_INT,
+ SPRD_DMA_CFGERR_INT,
+};
+
+/* dma channel hardware configuration */
+struct sprd_dma_chn_hw {
+ u32 pause;
+ u32 req;
+ u32 cfg;
+ u32 intc;
+ u32 src_addr;
+ u32 des_addr;
+ u32 frg_len;
+ u32 blk_len;
+ u32 trsc_len;
+ u32 trsf_step;
+ u32 wrap_ptr;
+ u32 wrap_to;
+ u32 llist_ptr;
+ u32 frg_step;
+ u32 src_blk_step;
+ u32 des_blk_step;
+};
+
+/* dma request description */
+struct sprd_dma_desc {
+ struct virt_dma_desc vd;
+ struct sprd_dma_chn_hw chn_hw;
+};
+
+/* dma channel description */
+struct sprd_dma_chn {
+ struct virt_dma_chan vc;
+ void __iomem *chn_base;
+ u32 chn_num;
+ u32 dev_id;
+ struct sprd_dma_desc *cur_desc;
+};
+
+/* SPRD dma device */
+struct sprd_dma_dev {
+ struct dma_device dma_dev;
+ void __iomem *glb_base;
+ struct clk *clk;
+ struct clk *ashb_clk;
+ int irq;
+ u32 total_chns;
+ struct sprd_dma_chn channels[0];
+};
+
+static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param);
+static struct of_dma_filter_info sprd_dma_info = {
+ .filter_fn = sprd_dma_filter_fn,
+};
+
+static inline struct sprd_dma_chn *to_sprd_dma_chan(struct dma_chan *c)
+{
+ return container_of(c, struct sprd_dma_chn, vc.chan);
+}
+
+static inline struct sprd_dma_dev *to_sprd_dma_dev(struct dma_chan *c)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(c);
+
+ return container_of(schan, struct sprd_dma_dev, channels[c->chan_id]);
+}
+
+static inline struct sprd_dma_desc *to_sprd_dma_desc(struct virt_dma_desc *vd)
+{
+ return container_of(vd, struct sprd_dma_desc, vd);
+}
+
+static void sprd_dma_chn_update(struct sprd_dma_chn *schan, u32 reg,
+ u32 mask, u32 val)
+{
+ u32 orig = readl(schan->chn_base + reg);
+ u32 tmp;
+
+ tmp = (orig & ~mask) | val;
+ writel(tmp, schan->chn_base + reg);
+}
+
+static int sprd_dma_enable(struct sprd_dma_dev *sdev)
+{
+ int ret;
+
+ ret = clk_prepare_enable(sdev->clk);
+ if (ret)
+ return ret;
+
+ /*
+ * The ashb_clk is optional and only for AGCP DMA controller, so we
+ * need add one condition to check if the ashb_clk need enable.
+ */
+ if (!IS_ERR(sdev->ashb_clk))
+ ret = clk_prepare_enable(sdev->ashb_clk);
+
+ return ret;
+}
+
+static void sprd_dma_disable(struct sprd_dma_dev *sdev)
+{
+ clk_disable_unprepare(sdev->clk);
+
+ /*
+ * Need to check if we need disable the optional ashb_clk for AGCP DMA.
+ */
+ if (!IS_ERR(sdev->ashb_clk))
+ clk_disable_unprepare(sdev->ashb_clk);
+}
+
+static void sprd_dma_set_uid(struct sprd_dma_chn *schan)
+{
+ struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
+ u32 dev_id = schan->dev_id;
+
+ if (dev_id != SPRD_DMA_SOFTWARE_UID) {
+ u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET +
+ SPRD_DMA_GLB_REQ_UID(dev_id);
+
+ writel(schan->chn_num + 1, sdev->glb_base + uid_offset);
+ }
+}
+
+static void sprd_dma_unset_uid(struct sprd_dma_chn *schan)
+{
+ struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
+ u32 dev_id = schan->dev_id;
+
+ if (dev_id != SPRD_DMA_SOFTWARE_UID) {
+ u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET +
+ SPRD_DMA_GLB_REQ_UID(dev_id);
+
+ writel(0, sdev->glb_base + uid_offset);
+ }
+}
+
+static void sprd_dma_clear_int(struct sprd_dma_chn *schan)
+{
+ sprd_dma_chn_update(schan, SPRD_DMA_CHN_INTC,
+ SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET,
+ SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET);
+}
+
+static void sprd_dma_enable_chn(struct sprd_dma_chn *schan)
+{
+ sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN,
+ SPRD_DMA_CHN_EN);
+}
+
+static void sprd_dma_disable_chn(struct sprd_dma_chn *schan)
+{
+ sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN, 0);
+}
+
+static void sprd_dma_soft_request(struct sprd_dma_chn *schan)
+{
+ sprd_dma_chn_update(schan, SPRD_DMA_CHN_REQ, SPRD_DMA_REQ_EN,
+ SPRD_DMA_REQ_EN);
+}
+
+static void sprd_dma_pause_resume(struct sprd_dma_chn *schan, bool enable)
+{
+ struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
+ u32 pause, timeout = SPRD_DMA_PAUSE_CNT;
+
+ if (enable) {
+ sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE,
+ SPRD_DMA_PAUSE_EN, SPRD_DMA_PAUSE_EN);
+
+ do {
+ pause = readl(schan->chn_base + SPRD_DMA_CHN_PAUSE);
+ if (pause & SPRD_DMA_PAUSE_STS)
+ break;
+
+ cpu_relax();
+ } while (--timeout > 0);
+
+ if (!timeout)
+ dev_warn(sdev->dma_dev.dev,
+ "pause dma controller timeout\n");
+ } else {
+ sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE,
+ SPRD_DMA_PAUSE_EN, 0);
+ }
+}
+
+static void sprd_dma_stop_and_disable(struct sprd_dma_chn *schan)
+{
+ u32 cfg = readl(schan->chn_base + SPRD_DMA_CHN_CFG);
+
+ if (!(cfg & SPRD_DMA_CHN_EN))
+ return;
+
+ sprd_dma_pause_resume(schan, true);
+ sprd_dma_disable_chn(schan);
+}
+
+static unsigned long sprd_dma_get_dst_addr(struct sprd_dma_chn *schan)
+{
+ unsigned long addr, addr_high;
+
+ addr = readl(schan->chn_base + SPRD_DMA_CHN_DES_ADDR);
+ addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_TO) &
+ SPRD_DMA_HIGH_ADDR_MASK;
+
+ return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET);
+}
+
+static enum sprd_dma_int_type sprd_dma_get_int_type(struct sprd_dma_chn *schan)
+{
+ struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
+ u32 intc_sts = readl(schan->chn_base + SPRD_DMA_CHN_INTC) &
+ SPRD_DMA_CHN_INT_STS;
+
+ switch (intc_sts) {
+ case SPRD_DMA_CFGERR_INT_STS:
+ return SPRD_DMA_CFGERR_INT;
+
+ case SPRD_DMA_LIST_INT_STS:
+ return SPRD_DMA_LIST_INT;
+
+ case SPRD_DMA_TRSC_INT_STS:
+ return SPRD_DMA_TRANS_INT;
+
+ case SPRD_DMA_BLK_INT_STS:
+ return SPRD_DMA_BLK_INT;
+
+ case SPRD_DMA_FRAG_INT_STS:
+ return SPRD_DMA_FRAG_INT;
+
+ default:
+ dev_warn(sdev->dma_dev.dev, "incorrect dma interrupt type\n");
+ return SPRD_DMA_NO_INT;
+ }
+}
+
+static enum sprd_dma_req_mode sprd_dma_get_req_type(struct sprd_dma_chn *schan)
+{
+ u32 frag_reg = readl(schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
+
+ return (frag_reg >> SPRD_DMA_REQ_MODE_OFFSET) & SPRD_DMA_REQ_MODE_MASK;
+}
+
+static void sprd_dma_set_chn_config(struct sprd_dma_chn *schan,
+ struct sprd_dma_desc *sdesc)
+{
+ struct sprd_dma_chn_hw *cfg = &sdesc->chn_hw;
+
+ writel(cfg->pause, schan->chn_base + SPRD_DMA_CHN_PAUSE);
+ writel(cfg->cfg, schan->chn_base + SPRD_DMA_CHN_CFG);
+ writel(cfg->intc, schan->chn_base + SPRD_DMA_CHN_INTC);
+ writel(cfg->src_addr, schan->chn_base + SPRD_DMA_CHN_SRC_ADDR);
+ writel(cfg->des_addr, schan->chn_base + SPRD_DMA_CHN_DES_ADDR);
+ writel(cfg->frg_len, schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
+ writel(cfg->blk_len, schan->chn_base + SPRD_DMA_CHN_BLK_LEN);
+ writel(cfg->trsc_len, schan->chn_base + SPRD_DMA_CHN_TRSC_LEN);
+ writel(cfg->trsf_step, schan->chn_base + SPRD_DMA_CHN_TRSF_STEP);
+ writel(cfg->wrap_ptr, schan->chn_base + SPRD_DMA_CHN_WARP_PTR);
+ writel(cfg->wrap_to, schan->chn_base + SPRD_DMA_CHN_WARP_TO);
+ writel(cfg->llist_ptr, schan->chn_base + SPRD_DMA_CHN_LLIST_PTR);
+ writel(cfg->frg_step, schan->chn_base + SPRD_DMA_CHN_FRAG_STEP);
+ writel(cfg->src_blk_step, schan->chn_base + SPRD_DMA_CHN_SRC_BLK_STEP);
+ writel(cfg->des_blk_step, schan->chn_base + SPRD_DMA_CHN_DES_BLK_STEP);
+ writel(cfg->req, schan->chn_base + SPRD_DMA_CHN_REQ);
+}
+
+static void sprd_dma_start(struct sprd_dma_chn *schan)
+{
+ struct virt_dma_desc *vd = vchan_next_desc(&schan->vc);
+
+ if (!vd)
+ return;
+
+ list_del(&vd->node);
+ schan->cur_desc = to_sprd_dma_desc(vd);
+
+ /*
+ * Copy the DMA configuration from DMA descriptor to this hardware
+ * channel.
+ */
+ sprd_dma_set_chn_config(schan, schan->cur_desc);
+ sprd_dma_set_uid(schan);
+ sprd_dma_enable_chn(schan);
+
+ if (schan->dev_id == SPRD_DMA_SOFTWARE_UID)
+ sprd_dma_soft_request(schan);
+}
+
+static void sprd_dma_stop(struct sprd_dma_chn *schan)
+{
+ sprd_dma_stop_and_disable(schan);
+ sprd_dma_unset_uid(schan);
+ sprd_dma_clear_int(schan);
+}
+
+static bool sprd_dma_check_trans_done(struct sprd_dma_desc *sdesc,
+ enum sprd_dma_int_type int_type,
+ enum sprd_dma_req_mode req_mode)
+{
+ if (int_type == SPRD_DMA_NO_INT)
+ return false;
+
+ if (int_type >= req_mode + 1)
+ return true;
+ else
+ return false;
+}
+
+static irqreturn_t dma_irq_handle(int irq, void *dev_id)
+{
+ struct sprd_dma_dev *sdev = (struct sprd_dma_dev *)dev_id;
+ u32 irq_status = readl(sdev->glb_base + SPRD_DMA_GLB_INT_MSK_STS);
+ struct sprd_dma_chn *schan;
+ struct sprd_dma_desc *sdesc;
+ enum sprd_dma_req_mode req_type;
+ enum sprd_dma_int_type int_type;
+ bool trans_done = false;
+ u32 i;
+
+ while (irq_status) {
+ i = __ffs(irq_status);
+ irq_status &= (irq_status - 1);
+ schan = &sdev->channels[i];
+
+ spin_lock(&schan->vc.lock);
+ int_type = sprd_dma_get_int_type(schan);
+ req_type = sprd_dma_get_req_type(schan);
+ sprd_dma_clear_int(schan);
+
+ sdesc = schan->cur_desc;
+
+ /* Check if the dma request descriptor is done. */
+ trans_done = sprd_dma_check_trans_done(sdesc, int_type,
+ req_type);
+ if (trans_done == true) {
+ vchan_cookie_complete(&sdesc->vd);
+ schan->cur_desc = NULL;
+ sprd_dma_start(schan);
+ }
+ spin_unlock(&schan->vc.lock);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int sprd_dma_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+ int ret;
+
+ ret = pm_runtime_get_sync(chan->device->dev);
+ if (ret < 0)
+ return ret;
+
+ schan->dev_id = SPRD_DMA_SOFTWARE_UID;
+ return 0;
+}
+
+static void sprd_dma_free_chan_resources(struct dma_chan *chan)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&schan->vc.lock, flags);
+ sprd_dma_stop(schan);
+ spin_unlock_irqrestore(&schan->vc.lock, flags);
+
+ vchan_free_chan_resources(&schan->vc);
+ pm_runtime_put(chan->device->dev);
+}
+
+static enum dma_status sprd_dma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+ struct virt_dma_desc *vd;
+ unsigned long flags;
+ enum dma_status ret;
+ u32 pos;
+
+ ret = dma_cookie_status(chan, cookie, txstate);
+ if (ret == DMA_COMPLETE || !txstate)
+ return ret;
+
+ spin_lock_irqsave(&schan->vc.lock, flags);
+ vd = vchan_find_desc(&schan->vc, cookie);
+ if (vd) {
+ struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
+ struct sprd_dma_chn_hw *hw = &sdesc->chn_hw;
+
+ if (hw->trsc_len > 0)
+ pos = hw->trsc_len;
+ else if (hw->blk_len > 0)
+ pos = hw->blk_len;
+ else if (hw->frg_len > 0)
+ pos = hw->frg_len;
+ else
+ pos = 0;
+ } else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) {
+ pos = sprd_dma_get_dst_addr(schan);
+ } else {
+ pos = 0;
+ }
+ spin_unlock_irqrestore(&schan->vc.lock, flags);
+
+ dma_set_residue(txstate, pos);
+ return ret;
+}
+
+static void sprd_dma_issue_pending(struct dma_chan *chan)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&schan->vc.lock, flags);
+ if (vchan_issue_pending(&schan->vc) && !schan->cur_desc)
+ sprd_dma_start(schan);
+ spin_unlock_irqrestore(&schan->vc.lock, flags);
+}
+
+static int sprd_dma_config(struct dma_chan *chan, struct sprd_dma_desc *sdesc,
+ dma_addr_t dest, dma_addr_t src, size_t len)
+{
+ struct sprd_dma_dev *sdev = to_sprd_dma_dev(chan);
+ struct sprd_dma_chn_hw *hw = &sdesc->chn_hw;
+ u32 datawidth, src_step, des_step, fragment_len;
+ u32 block_len, req_mode, irq_mode, transcation_len;
+ u32 fix_mode = 0, fix_en = 0;
+
+ if (IS_ALIGNED(len, 4)) {
+ datawidth = 2;
+ src_step = 4;
+ des_step = 4;
+ } else if (IS_ALIGNED(len, 2)) {
+ datawidth = 1;
+ src_step = 2;
+ des_step = 2;
+ } else {
+ datawidth = 0;
+ src_step = 1;
+ des_step = 1;
+ }
+
+ fragment_len = SPRD_DMA_MEMCPY_MIN_SIZE;
+ if (len <= SPRD_DMA_BLK_LEN_MASK) {
+ block_len = len;
+ transcation_len = 0;
+ req_mode = SPRD_DMA_BLK_REQ;
+ irq_mode = SPRD_DMA_BLK_INT;
+ } else {
+ block_len = SPRD_DMA_MEMCPY_MIN_SIZE;
+ transcation_len = len;
+ req_mode = SPRD_DMA_TRANS_REQ;
+ irq_mode = SPRD_DMA_TRANS_INT;
+ }
+
+ hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET;
+ hw->wrap_ptr = (u32)((src >> SPRD_DMA_HIGH_ADDR_OFFSET) &
+ SPRD_DMA_HIGH_ADDR_MASK);
+ hw->wrap_to = (u32)((dest >> SPRD_DMA_HIGH_ADDR_OFFSET) &
+ SPRD_DMA_HIGH_ADDR_MASK);
+
+ hw->src_addr = (u32)(src & SPRD_DMA_LOW_ADDR_MASK);
+ hw->des_addr = (u32)(dest & SPRD_DMA_LOW_ADDR_MASK);
+
+ if ((src_step != 0 && des_step != 0) || (src_step | des_step) == 0) {
+ fix_en = 0;
+ } else {
+ fix_en = 1;
+ if (src_step)
+ fix_mode = 1;
+ else
+ fix_mode = 0;
+ }
+
+ hw->frg_len = datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET |
+ datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET |
+ req_mode << SPRD_DMA_REQ_MODE_OFFSET |
+ fix_mode << SPRD_DMA_FIX_SEL_OFFSET |
+ fix_en << SPRD_DMA_FIX_EN_OFFSET |
+ (fragment_len & SPRD_DMA_FRG_LEN_MASK);
+ hw->blk_len = block_len & SPRD_DMA_BLK_LEN_MASK;
+
+ hw->intc = SPRD_DMA_CFG_ERR_INT_EN;
+
+ switch (irq_mode) {
+ case SPRD_DMA_NO_INT:
+ break;
+
+ case SPRD_DMA_FRAG_INT:
+ hw->intc |= SPRD_DMA_FRAG_INT_EN;
+ break;
+
+ case SPRD_DMA_BLK_INT:
+ hw->intc |= SPRD_DMA_BLK_INT_EN;
+ break;
+
+ case SPRD_DMA_BLK_FRAG_INT:
+ hw->intc |= SPRD_DMA_BLK_INT_EN | SPRD_DMA_FRAG_INT_EN;
+ break;
+
+ case SPRD_DMA_TRANS_INT:
+ hw->intc |= SPRD_DMA_TRANS_INT_EN;
+ break;
+
+ case SPRD_DMA_TRANS_FRAG_INT:
+ hw->intc |= SPRD_DMA_TRANS_INT_EN | SPRD_DMA_FRAG_INT_EN;
+ break;
+
+ case SPRD_DMA_TRANS_BLK_INT:
+ hw->intc |= SPRD_DMA_TRANS_INT_EN | SPRD_DMA_BLK_INT_EN;
+ break;
+
+ case SPRD_DMA_LIST_INT:
+ hw->intc |= SPRD_DMA_LIST_INT_EN;
+ break;
+
+ case SPRD_DMA_CFGERR_INT:
+ hw->intc |= SPRD_DMA_CFG_ERR_INT_EN;
+ break;
+
+ default:
+ dev_err(sdev->dma_dev.dev, "invalid irq mode\n");
+ return -EINVAL;
+ }
+
+ if (transcation_len == 0)
+ hw->trsc_len = block_len & SPRD_DMA_TRSC_LEN_MASK;
+ else
+ hw->trsc_len = transcation_len & SPRD_DMA_TRSC_LEN_MASK;
+
+ hw->trsf_step = (des_step & SPRD_DMA_TRSF_STEP_MASK) <<
+ SPRD_DMA_DEST_TRSF_STEP_OFFSET |
+ (src_step & SPRD_DMA_TRSF_STEP_MASK) <<
+ SPRD_DMA_SRC_TRSF_STEP_OFFSET;
+
+ hw->frg_step = 0;
+ hw->src_blk_step = 0;
+ hw->des_blk_step = 0;
+ hw->src_blk_step = 0;
+ return 0;
+}
+
+struct dma_async_tx_descriptor *
+sprd_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
+ size_t len, unsigned long flags)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+ struct sprd_dma_desc *sdesc;
+ int ret;
+
+ sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
+ if (!sdesc)
+ return NULL;
+
+ ret = sprd_dma_config(chan, sdesc, dest, src, len);
+ if (ret) {
+ kfree(sdesc);
+ return NULL;
+ }
+
+ return vchan_tx_prep(&schan->vc, &sdesc->vd, flags);
+}
+
+static int sprd_dma_pause(struct dma_chan *chan)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&schan->vc.lock, flags);
+ sprd_dma_pause_resume(schan, true);
+ spin_unlock_irqrestore(&schan->vc.lock, flags);
+
+ return 0;
+}
+
+static int sprd_dma_resume(struct dma_chan *chan)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&schan->vc.lock, flags);
+ sprd_dma_pause_resume(schan, false);
+ spin_unlock_irqrestore(&schan->vc.lock, flags);
+
+ return 0;
+}
+
+static int sprd_dma_terminate_all(struct dma_chan *chan)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+ unsigned long flags;
+ LIST_HEAD(head);
+
+ spin_lock_irqsave(&schan->vc.lock, flags);
+ sprd_dma_stop(schan);
+
+ vchan_get_all_descriptors(&schan->vc, &head);
+ spin_unlock_irqrestore(&schan->vc.lock, flags);
+
+ vchan_dma_desc_free_list(&schan->vc, &head);
+ return 0;
+}
+
+static void sprd_dma_free_desc(struct virt_dma_desc *vd)
+{
+ struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
+
+ kfree(sdesc);
+}
+
+static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param)
+{
+ struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+ struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
+ u32 req = *(u32 *)param;
+
+ if (req < sdev->total_chns)
+ return req == schan->chn_num + 1;
+ else
+ return false;
+}
+
+static int sprd_dma_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct sprd_dma_dev *sdev;
+ struct sprd_dma_chn *dma_chn;
+ struct resource *res;
+ u32 chn_count;
+ int ret, i;
+
+ ret = device_property_read_u32(&pdev->dev, "#dma-channels", &chn_count);
+ if (ret) {
+ dev_err(&pdev->dev, "get dma channels count failed\n");
+ return ret;
+ }
+
+ sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev) +
+ sizeof(*dma_chn) * chn_count,
+ GFP_KERNEL);
+ if (!sdev)
+ return -ENOMEM;
+
+ sdev->clk = devm_clk_get(&pdev->dev, "enable");
+ if (IS_ERR(sdev->clk)) {
+ dev_err(&pdev->dev, "get enable clock failed\n");
+ return PTR_ERR(sdev->clk);
+ }
+
+ /* ashb clock is optional for AGCP DMA */
+ sdev->ashb_clk = devm_clk_get(&pdev->dev, "ashb_eb");
+ if (IS_ERR(sdev->ashb_clk))
+ dev_warn(&pdev->dev, "no optional ashb eb clock\n");
+
+ /*
+ * We have three DMA controllers: AP DMA, AON DMA and AGCP DMA. For AGCP
+ * DMA controller, it can or do not request the irq, which will save
+ * system power without resuming system by DMA interrupts if AGCP DMA
+ * does not request the irq. Thus the DMA interrupts property should
+ * be optional.
+ */
+ sdev->irq = platform_get_irq(pdev, 0);
+ if (sdev->irq > 0) {
+ ret = devm_request_irq(&pdev->dev, sdev->irq, dma_irq_handle,
+ 0, "sprd_dma", (void *)sdev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "request dma irq failed\n");
+ return ret;
+ }
+ } else {
+ dev_warn(&pdev->dev, "no interrupts for the dma controller\n");
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ sdev->glb_base = devm_ioremap_nocache(&pdev->dev, res->start,
+ resource_size(res));
+ if (!sdev->glb_base)
+ return -ENOMEM;
+
+ dma_cap_set(DMA_MEMCPY, sdev->dma_dev.cap_mask);
+ sdev->total_chns = chn_count;
+ sdev->dma_dev.chancnt = chn_count;
+ INIT_LIST_HEAD(&sdev->dma_dev.channels);
+ INIT_LIST_HEAD(&sdev->dma_dev.global_node);
+ sdev->dma_dev.dev = &pdev->dev;
+ sdev->dma_dev.device_alloc_chan_resources = sprd_dma_alloc_chan_resources;
+ sdev->dma_dev.device_free_chan_resources = sprd_dma_free_chan_resources;
+ sdev->dma_dev.device_tx_status = sprd_dma_tx_status;
+ sdev->dma_dev.device_issue_pending = sprd_dma_issue_pending;
+ sdev->dma_dev.device_prep_dma_memcpy = sprd_dma_prep_dma_memcpy;
+ sdev->dma_dev.device_pause = sprd_dma_pause;
+ sdev->dma_dev.device_resume = sprd_dma_resume;
+ sdev->dma_dev.device_terminate_all = sprd_dma_terminate_all;
+
+ for (i = 0; i < chn_count; i++) {
+ dma_chn = &sdev->channels[i];
+ dma_chn->chn_num = i;
+ dma_chn->cur_desc = NULL;
+ /* get each channel's registers base address. */
+ dma_chn->chn_base = sdev->glb_base + SPRD_DMA_CHN_REG_OFFSET +
+ SPRD_DMA_CHN_REG_LENGTH * i;
+
+ dma_chn->vc.desc_free = sprd_dma_free_desc;
+ vchan_init(&dma_chn->vc, &sdev->dma_dev);
+ }
+
+ platform_set_drvdata(pdev, sdev);
+ ret = sprd_dma_enable(sdev);
+ if (ret)
+ return ret;
+
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
+ ret = pm_runtime_get_sync(&pdev->dev);
+ if (ret < 0)
+ goto err_rpm;
+
+ ret = dma_async_device_register(&sdev->dma_dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "register dma device failed:%d\n", ret);
+ goto err_register;
+ }
+
+ sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask;
+ ret = of_dma_controller_register(np, of_dma_simple_xlate,
+ &sprd_dma_info);
+ if (ret)
+ goto err_of_register;
+
+ pm_runtime_put(&pdev->dev);
+ return 0;
+
+err_of_register:
+ dma_async_device_unregister(&sdev->dma_dev);
+err_register:
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+err_rpm:
+ sprd_dma_disable(sdev);
+ return ret;
+}
+
+static int sprd_dma_remove(struct platform_device *pdev)
+{
+ struct sprd_dma_dev *sdev = platform_get_drvdata(pdev);
+ struct sprd_dma_chn *c, *cn;
+ int ret;
+
+ ret = pm_runtime_get_sync(&pdev->dev);
+ if (ret < 0)
+ return ret;
+
+ /* explicitly free the irq */
+ if (sdev->irq > 0)
+ devm_free_irq(&pdev->dev, sdev->irq, sdev);
+
+ list_for_each_entry_safe(c, cn, &sdev->dma_dev.channels,
+ vc.chan.device_node) {
+ list_del(&c->vc.chan.device_node);
+ tasklet_kill(&c->vc.task);
+ }
+
+ of_dma_controller_free(pdev->dev.of_node);
+ dma_async_device_unregister(&sdev->dma_dev);
+ sprd_dma_disable(sdev);
+
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ return 0;
+}
+
+static const struct of_device_id sprd_dma_match[] = {
+ { .compatible = "sprd,sc9860-dma", },
+ {},
+};
+
+static int __maybe_unused sprd_dma_runtime_suspend(struct device *dev)
+{
+ struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
+
+ sprd_dma_disable(sdev);
+ return 0;
+}
+
+static int __maybe_unused sprd_dma_runtime_resume(struct device *dev)
+{
+ struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
+ int ret;
+
+ ret = sprd_dma_enable(sdev);
+ if (ret)
+ dev_err(sdev->dma_dev.dev, "enable dma failed\n");
+
+ return ret;
+}
+
+static const struct dev_pm_ops sprd_dma_pm_ops = {
+ SET_RUNTIME_PM_OPS(sprd_dma_runtime_suspend,
+ sprd_dma_runtime_resume,
+ NULL)
+};
+
+static struct platform_driver sprd_dma_driver = {
+ .probe = sprd_dma_probe,
+ .remove = sprd_dma_remove,
+ .driver = {
+ .name = "sprd-dma",
+ .of_match_table = sprd_dma_match,
+ .pm = &sprd_dma_pm_ops,
+ },
+};
+module_platform_driver(sprd_dma_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DMA driver for Spreadtrum");
+MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
+MODULE_ALIAS("platform:sprd-dma");