mfd: altr_a10sr: Add Altera Arria10 DevKit System Resource Chip
Add support for the Altera Arria10 Development Kit System Resource
chip which is implemented using a MAX5 as a external gpio extender
with the regmap framework over a SPI bus.
Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/altera-a10sr.c b/drivers/mfd/altera-a10sr.c
new file mode 100644
index 0000000..c05aa4f
--- /dev/null
+++ b/drivers/mfd/altera-a10sr.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPI access for Altera Arria10 MAX5 System Resource Chip
+ *
+ * Adapted from DA9052
+ */
+
+#include <linux/mfd/altera-a10sr.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/spi/spi.h>
+
+static const struct mfd_cell altr_a10sr_subdev_info[] = {
+ {
+ .name = "altr_a10sr_gpio",
+ .of_compatible = "altr,a10sr-gpio",
+ },
+};
+
+static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case ALTR_A10SR_VERSION_READ:
+ case ALTR_A10SR_LED_REG:
+ case ALTR_A10SR_PBDSW_REG:
+ case ALTR_A10SR_PBDSW_IRQ_REG:
+ case ALTR_A10SR_PWR_GOOD1_REG:
+ case ALTR_A10SR_PWR_GOOD2_REG:
+ case ALTR_A10SR_PWR_GOOD3_REG:
+ case ALTR_A10SR_FMCAB_REG:
+ case ALTR_A10SR_HPS_RST_REG:
+ case ALTR_A10SR_USB_QSPI_REG:
+ case ALTR_A10SR_SFPA_REG:
+ case ALTR_A10SR_SFPB_REG:
+ case ALTR_A10SR_I2C_M_REG:
+ case ALTR_A10SR_WARM_RST_REG:
+ case ALTR_A10SR_WR_KEY_REG:
+ case ALTR_A10SR_PMBUS_REG:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case ALTR_A10SR_LED_REG:
+ case ALTR_A10SR_PBDSW_IRQ_REG:
+ case ALTR_A10SR_FMCAB_REG:
+ case ALTR_A10SR_HPS_RST_REG:
+ case ALTR_A10SR_USB_QSPI_REG:
+ case ALTR_A10SR_SFPA_REG:
+ case ALTR_A10SR_SFPB_REG:
+ case ALTR_A10SR_WARM_RST_REG:
+ case ALTR_A10SR_WR_KEY_REG:
+ case ALTR_A10SR_PMBUS_REG:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case ALTR_A10SR_PBDSW_REG:
+ case ALTR_A10SR_PBDSW_IRQ_REG:
+ case ALTR_A10SR_PWR_GOOD1_REG:
+ case ALTR_A10SR_PWR_GOOD2_REG:
+ case ALTR_A10SR_PWR_GOOD3_REG:
+ case ALTR_A10SR_HPS_RST_REG:
+ case ALTR_A10SR_I2C_M_REG:
+ case ALTR_A10SR_WARM_RST_REG:
+ case ALTR_A10SR_WR_KEY_REG:
+ case ALTR_A10SR_PMBUS_REG:
+ return true;
+ default:
+ return false;
+ }
+}
+
+const struct regmap_config altr_a10sr_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .cache_type = REGCACHE_NONE,
+
+ .use_single_rw = true,
+ .read_flag_mask = 1,
+ .write_flag_mask = 0,
+
+ .max_register = ALTR_A10SR_WR_KEY_REG,
+ .readable_reg = altr_a10sr_reg_readable,
+ .writeable_reg = altr_a10sr_reg_writeable,
+ .volatile_reg = altr_a10sr_reg_volatile,
+
+};
+
+static int altr_a10sr_spi_probe(struct spi_device *spi)
+{
+ int ret;
+ struct altr_a10sr *a10sr;
+
+ a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr),
+ GFP_KERNEL);
+ if (!a10sr)
+ return -ENOMEM;
+
+ spi->mode = SPI_MODE_3;
+ spi->bits_per_word = 8;
+ spi_setup(spi);
+
+ a10sr->dev = &spi->dev;
+
+ spi_set_drvdata(spi, a10sr);
+
+ a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config);
+ if (IS_ERR(a10sr->regmap)) {
+ ret = PTR_ERR(a10sr->regmap);
+ dev_err(&spi->dev, "Failed to allocate register map: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO,
+ altr_a10sr_subdev_info,
+ ARRAY_SIZE(altr_a10sr_subdev_info),
+ NULL, 0, NULL);
+ if (ret)
+ dev_err(a10sr->dev, "Failed to register sub-devices: %d\n",
+ ret);
+
+ return ret;
+}
+
+static const struct of_device_id altr_a10sr_spi_of_match[] = {
+ { .compatible = "altr,a10sr" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, altr_a10sr_spi_of_match);
+
+static struct spi_driver altr_a10sr_spi_driver = {
+ .probe = altr_a10sr_spi_probe,
+ .driver = {
+ .name = "altr_a10sr",
+ .of_match_table = of_match_ptr(altr_a10sr_spi_of_match),
+ },
+};
+
+module_spi_driver(altr_a10sr_spi_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
+MODULE_DESCRIPTION("Altera Arria10 DevKit System Resource MFD Driver");