mfd: Add STw481x driver

This adds a driver for the STw481x PMICs found in the Nomadik
family of platforms. This one uses pure device tree probing.
Print some of the OTP registers on boot and register a regulator
MFD child.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 261 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 914c3d142f78..d078fe4a82ef 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1151,6 +1151,16 @@ config MFD_WM8994
           core support for the WM8994, in order to use the actual
           functionaltiy of the device other drivers must be enabled.
 
+config MFD_STW481X
+        bool "Support for ST Microelectronics STw481x"
+        depends on I2C && ARCH_NOMADIK
+        select REGMAP_I2C
+        select MFD_CORE
+        help
+          Select this option to enable the STw481x chip driver used
+          in various ST Microelectronics and ST-Ericsson embedded
+          Nomadik series.
+
 endmenu
 endif
 
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 15b905c6553c..656cec90a1e5 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -162,3 +162,4 @@ obj-$(CONFIG_MFD_LM3533)	+= lm3533-core.o lm3533-ctrlbank.o
 obj-$(CONFIG_VEXPRESS_CONFIG)   += vexpress-config.o vexpress-sysreg.o
 obj-$(CONFIG_MFD_RETU)          += retu-mfd.o
 obj-$(CONFIG_MFD_AS3711)        += as3711.o
+obj-$(CONFIG_MFD_STW481X)       += stw481x.o
diff --git a/drivers/mfd/stw481x.c b/drivers/mfd/stw481x.c
new file mode 100644
index 000000000000..1243d5c6a448
--- /dev/null
+++ b/drivers/mfd/stw481x.c
@@ -0,0 +1,250 @@
+/*
+ * Core driver for STw4810/STw4811
+ *
+ * Copyright (C) 2013 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/stw481x.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+
+/*
+ * This driver can only access the non-USB portions of STw4811, the register
+ * range 0x00-0x10 dealing with USB is bound to the two special I2C pins used
+ * for USB control.
+ */
+
+/* Registers inside the power control address space */
+#define STW_PC_VCORE_SEL        0x05U
+#define STW_PC_VAUX_SEL         0x06U
+#define STW_PC_VPLL_SEL         0x07U
+
+/**
+ * stw481x_get_pctl_reg() - get a power control register
+ * @stw481x: handle to the stw481x chip
+ * @reg: power control register to fetch
+ *
+ * The power control registers is a set of one-time-programmable registers
+ * in its own register space, accessed by writing addess bits to these
+ * two registers: bits 7,6,5 of PCTL_REG_LO corresponds to the 3 LSBs of
+ * the address and bits 8,9 of PCTL_REG_HI corresponds to the 2 MSBs of
+ * the address, forming an address space of 5 bits, i.e. 32 registers
+ * 0x00 ... 0x1f can be obtained.
+ */
+static int stw481x_get_pctl_reg(struct stw481x *stw481x, u8 reg)
+{
+        u8 msb = (reg >> 3) & 0x03;
+        u8 lsb = (reg << 5) & 0xe0;
+        unsigned int val;
+        u8 vrfy;
+        int ret;
+
+        ret = regmap_write(stw481x->map, STW_PCTL_REG_HI, msb);
+        if (ret)
+                return ret;
+        ret = regmap_write(stw481x->map, STW_PCTL_REG_LO, lsb);
+        if (ret)
+                return ret;
+        ret = regmap_read(stw481x->map, STW_PCTL_REG_HI, &val);
+        if (ret)
+                return ret;
+        vrfy = (val & 0x03) << 3;
+        ret = regmap_read(stw481x->map, STW_PCTL_REG_LO, &val);
+        if (ret)
+                return ret;
+        vrfy |= ((val >> 5) & 0x07);
+        if (vrfy != reg)
+                return -EIO;
+        return (val >> 1) & 0x0f;
+}
+
+static int stw481x_startup(struct stw481x *stw481x)
+{
+        /* Voltages multiplied by 100 */
+        u8 vcore_val[] = { 100, 105, 110, 115, 120, 122, 124, 126, 128,
+                           130, 132, 134, 136, 138, 140, 145 };
+        u8 vpll_val[] = { 105, 120, 130, 180 };
+        u8 vaux_val[] = { 15, 18, 25, 28 };
+        u8 vcore;
+        u8 vcore_slp;
+        u8 vpll;
+        u8 vaux;
+        bool vaux_en;
+        bool it_warn;
+        int ret;
+        unsigned int val;
+
+        ret = regmap_read(stw481x->map, STW_CONF1, &val);
+        if (ret)
+                return ret;
+        vaux_en = !!(val & STW_CONF1_PDN_VAUX);
+        it_warn = !!(val & STW_CONF1_IT_WARN);
+
+        dev_info(&stw481x->client->dev, "voltages %s\n",
+                (val & STW_CONF1_V_MONITORING) ? "OK" : "LOW");
+        dev_info(&stw481x->client->dev, "MMC level shifter %s\n",
+                (val & STW_CONF1_MMC_LS_STATUS) ? "high impedance" : "ON");
+        dev_info(&stw481x->client->dev, "VMMC: %s\n",
+                (val & STW_CONF1_PDN_VMMC) ? "ON" : "disabled");
+
+        dev_info(&stw481x->client->dev, "STw481x power control registers:\n");
+
+        ret = stw481x_get_pctl_reg(stw481x, STW_PC_VCORE_SEL);
+        if (ret < 0)
+                return ret;
+        vcore = ret & 0x0f;
+
+        ret = stw481x_get_pctl_reg(stw481x, STW_PC_VAUX_SEL);
+        if (ret < 0)
+                return ret;
+        vaux = (ret >> 2) & 3;
+        vpll = (ret >> 4) & 1; /* Save bit 4 */
+
+        ret = stw481x_get_pctl_reg(stw481x, STW_PC_VPLL_SEL);
+        if (ret < 0)
+                return ret;
+        vpll |= (ret >> 1) & 2;
+
+        dev_info(&stw481x->client->dev, "VCORE: %u.%uV %s\n",
+                vcore_val[vcore] / 100, vcore_val[vcore] % 100,
+                (ret & 4) ? "ON" : "OFF");
+
+        dev_info(&stw481x->client->dev, "VPLL:  %u.%uV %s\n",
+                vpll_val[vpll] / 100, vpll_val[vpll] % 100,
+                (ret & 0x10) ? "ON" : "OFF");
+
+        dev_info(&stw481x->client->dev, "VAUX:  %u.%uV %s\n",
+                vaux_val[vaux] / 10, vaux_val[vaux] % 10,
+                vaux_en ? "ON" : "OFF");
+
+        ret = regmap_read(stw481x->map, STW_CONF2, &val);
+        if (ret)
+                return ret;
+
+        dev_info(&stw481x->client->dev, "TWARN: %s threshold, %s\n",
+                it_warn ? "below" : "above",
+                (val & STW_CONF2_MASK_TWARN) ?
+                 "enabled" : "mask through VDDOK");
+        dev_info(&stw481x->client->dev, "VMMC: %s\n",
+                (val & STW_CONF2_VMMC_EXT) ? "internal" : "external");
+        dev_info(&stw481x->client->dev, "IT WAKE UP: %s\n",
+                (val & STW_CONF2_MASK_IT_WAKE_UP) ? "enabled" : "masked");
+        dev_info(&stw481x->client->dev, "GPO1: %s\n",
+                (val & STW_CONF2_GPO1) ? "low" : "high impedance");
+        dev_info(&stw481x->client->dev, "GPO2: %s\n",
+                (val & STW_CONF2_GPO2) ? "low" : "high impedance");
+
+        ret = regmap_read(stw481x->map, STW_VCORE_SLEEP, &val);
+        if (ret)
+                return ret;
+        vcore_slp = val & 0x0f;
+        dev_info(&stw481x->client->dev, "VCORE SLEEP: %u.%uV\n",
+                vcore_val[vcore_slp] / 100, vcore_val[vcore_slp] % 100);
+
+        return 0;
+}
+
+/*
+ * MFD cells - we have one cell which is selected operation
+ * mode, and we always have a GPIO cell.
+ */
+static struct mfd_cell stw481x_cells[] = {
+        {
+                .of_compatible = "st,stw481x-vmmc",
+                .name = "stw481x-vmmc-regulator",
+                .id = -1,
+        },
+};
+
+const struct regmap_config stw481x_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+};
+
+static int stw481x_probe(struct i2c_client *client,
+                         const struct i2c_device_id *id)
+{
+        struct stw481x                  *stw481x;
+        int ret;
+        int i;
+
+        stw481x = devm_kzalloc(&client->dev, sizeof(*stw481x), GFP_KERNEL);
+        if (!stw481x)
+                return -ENOMEM;
+
+        i2c_set_clientdata(client, stw481x);
+        stw481x->client = client;
+        stw481x->map = devm_regmap_init_i2c(client, &stw481x_regmap_config);
+
+        ret = stw481x_startup(stw481x);
+        if (ret) {
+                dev_err(&client->dev, "chip initialization failed\n");
+                return ret;
+        }
+
+        /* Set up and register the platform devices. */
+        for (i = 0; i < ARRAY_SIZE(stw481x_cells); i++) {
+                /* One state holder for all drivers, this is simple */
+                stw481x_cells[i].platform_data = stw481x;
+                stw481x_cells[i].pdata_size = sizeof(*stw481x);
+        }
+
+        ret = mfd_add_devices(&client->dev, 0, stw481x_cells,
+                        ARRAY_SIZE(stw481x_cells), NULL, 0, NULL);
+        if (ret)
+                return ret;
+
+        dev_info(&client->dev, "initialized STw481x device\n");
+
+        return ret;
+}
+
+static int stw481x_remove(struct i2c_client *client)
+{
+        mfd_remove_devices(&client->dev);
+        return 0;
+}
+
+/*
+ * This ID table is completely unused, as this is a pure
+ * device-tree probed driver, but it has to be here due to
+ * the structure of the I2C core.
+ */
+static const struct i2c_device_id stw481x_id[] = {
+        { "stw481x", 0 },
+        { },
+};
+
+static const struct of_device_id stw481x_match[] = {
+        { .compatible = "st,stw4810", },
+        { .compatible = "st,stw4811", },
+        { },
+};
+MODULE_DEVICE_TABLE(of, stw481x_match);
+
+static struct i2c_driver stw481x_driver = {
+        .driver = {
+                .name   = "stw481x",
+                .of_match_table = stw481x_match,
+        },
+        .probe          = stw481x_probe,
+        .remove         = stw481x_remove,
+        .id_table       = stw481x_id,
+};
+
+module_i2c_driver(stw481x_driver);
+
+MODULE_AUTHOR("Linus Walleij");
+MODULE_DESCRIPTION("STw481x PMIC driver");
+MODULE_LICENSE("GPL v2");