pinctrl: Add Qualcomm TLMM driver

This adds a pinctrl, pinmux, pinconf and gpiolib driver for the
Qualcomm TLMM block.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

4 files changed, 1157 insertions, 0 deletions

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 5e4418f4282b..f5a7d7c0c1ee 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -203,6 +203,12 @@ config PINCTRL_IMX28
         bool
         select PINCTRL_MXS
 
+config PINCTRL_MSM
+        bool
+        select PINMUX
+        select PINCONF
+        select GENERIC_PINCONF
+
 config PINCTRL_NOMADIK
         bool "Nomadik pin controller driver"
         depends on ARCH_U8500 || ARCH_NOMADIK
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index dcb01a4ef653..4eed91ff0676 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_PINCTRL_MXS)	+= pinctrl-mxs.o
 obj-$(CONFIG_PINCTRL_IMX23)     += pinctrl-imx23.o
 obj-$(CONFIG_PINCTRL_IMX25)     += pinctrl-imx25.o
 obj-$(CONFIG_PINCTRL_IMX28)     += pinctrl-imx28.o
+obj-$(CONFIG_PINCTRL_MSM)       += pinctrl-msm.o
 obj-$(CONFIG_PINCTRL_NOMADIK)   += pinctrl-nomadik.o
 obj-$(CONFIG_PINCTRL_STN8815)   += pinctrl-nomadik-stn8815.o
 obj-$(CONFIG_PINCTRL_DB8500)    += pinctrl-nomadik-db8500.o
diff --git a/drivers/pinctrl/pinctrl-msm.c b/drivers/pinctrl/pinctrl-msm.c
new file mode 100644
index 000000000000..28b90aba708d
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-msm.c
@@ -0,0 +1,1028 @@
+/*
+ * Copyright (c) 2013, Sony Mobile Communications AB.
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/err.h>
+#include <linux/irqdomain.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/of_irq.h>
+#include <linux/spinlock.h>
+
+#include "core.h"
+#include "pinconf.h"
+#include "pinctrl-msm.h"
+#include "pinctrl-utils.h"
+
+/**
+ * struct msm_pinctrl - state for a pinctrl-msm device
+ * @dev:            device handle.
+ * @pctrl:          pinctrl handle.
+ * @domain:         irqdomain handle.
+ * @chip:           gpiochip handle.
+ * @irq:            parent irq for the TLMM irq_chip.
+ * @lock:           Spinlock to protect register resources as well
+ *                  as msm_pinctrl data structures.
+ * @enabled_irqs:   Bitmap of currently enabled irqs.
+ * @dual_edge_irqs: Bitmap of irqs that need sw emulated dual edge
+ *                  detection.
+ * @wake_irqs:      Bitmap of irqs with requested as wakeup source.
+ * @soc;            Reference to soc_data of platform specific data.
+ * @regs:           Base address for the TLMM register map.
+ */
+struct msm_pinctrl {
+        struct device *dev;
+        struct pinctrl_dev *pctrl;
+        struct irq_domain *domain;
+        struct gpio_chip chip;
+        unsigned irq;
+
+        spinlock_t lock;
+
+        unsigned long *enabled_irqs;
+        unsigned long *dual_edge_irqs;
+        unsigned long *wake_irqs;
+
+        const struct msm_pinctrl_soc_data *soc;
+        void __iomem *regs;
+};
+
+static int msm_get_groups_count(struct pinctrl_dev *pctldev)
+{
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+        return pctrl->soc->ngroups;
+}
+
+static const char *msm_get_group_name(struct pinctrl_dev *pctldev,
+                                      unsigned group)
+{
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+        return pctrl->soc->groups[group].name;
+}
+
+static int msm_get_group_pins(struct pinctrl_dev *pctldev,
+                              unsigned group,
+                              const unsigned **pins,
+                              unsigned *num_pins)
+{
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+        *pins = pctrl->soc->groups[group].pins;
+        *num_pins = pctrl->soc->groups[group].npins;
+        return 0;
+}
+
+static struct pinctrl_ops msm_pinctrl_ops = {
+        .get_groups_count       = msm_get_groups_count,
+        .get_group_name         = msm_get_group_name,
+        .get_group_pins         = msm_get_group_pins,
+        .dt_node_to_map         = pinconf_generic_dt_node_to_map_group,
+        .dt_free_map            = pinctrl_utils_dt_free_map,
+};
+
+static int msm_get_functions_count(struct pinctrl_dev *pctldev)
+{
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+        return pctrl->soc->nfunctions;
+}
+
+static const char *msm_get_function_name(struct pinctrl_dev *pctldev,
+                                         unsigned function)
+{
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+        return pctrl->soc->functions[function].name;
+}
+
+static int msm_get_function_groups(struct pinctrl_dev *pctldev,
+                                   unsigned function,
+                                   const char * const **groups,
+                                   unsigned * const num_groups)
+{
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+
+        *groups = pctrl->soc->functions[function].groups;
+        *num_groups = pctrl->soc->functions[function].ngroups;
+        return 0;
+}
+
+static int msm_pinmux_enable(struct pinctrl_dev *pctldev,
+                             unsigned function,
+                             unsigned group)
+{
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+        const struct msm_pingroup *g;
+        unsigned long flags;
+        u32 val;
+        int i;
+
+        g = &pctrl->soc->groups[group];
+
+        if (WARN_ON(g->mux_bit < 0))
+                return -EINVAL;
+
+        for (i = 0; i < ARRAY_SIZE(g->funcs); i++) {
+                if (g->funcs[i] == function)
+                        break;
+        }
+
+        if (WARN_ON(i == ARRAY_SIZE(g->funcs)))
+                return -EINVAL;
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        val = readl(pctrl->regs + g->ctl_reg);
+        val &= ~(0x7 << g->mux_bit);
+        val |= i << g->mux_bit;
+        writel(val, pctrl->regs + g->ctl_reg);
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+
+        return 0;
+}
+
+static void msm_pinmux_disable(struct pinctrl_dev *pctldev,
+                               unsigned function,
+                               unsigned group)
+{
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+        const struct msm_pingroup *g;
+        unsigned long flags;
+        u32 val;
+
+        g = &pctrl->soc->groups[group];
+
+        if (WARN_ON(g->mux_bit < 0))
+                return;
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        /* Clear the mux bits to select gpio mode */
+        val = readl(pctrl->regs + g->ctl_reg);
+        val &= ~(0x7 << g->mux_bit);
+        writel(val, pctrl->regs + g->ctl_reg);
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static struct pinmux_ops msm_pinmux_ops = {
+        .get_functions_count    = msm_get_functions_count,
+        .get_function_name      = msm_get_function_name,
+        .get_function_groups    = msm_get_function_groups,
+        .enable                 = msm_pinmux_enable,
+        .disable                = msm_pinmux_disable,
+};
+
+static int msm_config_reg(struct msm_pinctrl *pctrl,
+                          const struct msm_pingroup *g,
+                          unsigned param,
+                          unsigned *reg,
+                          unsigned *mask,
+                          unsigned *bit)
+{
+        switch (param) {
+        case PIN_CONFIG_BIAS_DISABLE:
+                *reg = g->ctl_reg;
+                *bit = g->pull_bit;
+                *mask = 3;
+                break;
+        case PIN_CONFIG_BIAS_PULL_DOWN:
+                *reg = g->ctl_reg;
+                *bit = g->pull_bit;
+                *mask = 3;
+                break;
+        case PIN_CONFIG_BIAS_PULL_UP:
+                *reg = g->ctl_reg;
+                *bit = g->pull_bit;
+                *mask = 3;
+                break;
+        case PIN_CONFIG_DRIVE_STRENGTH:
+                *reg = g->ctl_reg;
+                *bit = g->drv_bit;
+                *mask = 7;
+                break;
+        default:
+                dev_err(pctrl->dev, "Invalid config param %04x\n", param);
+                return -ENOTSUPP;
+        }
+
+        if (*reg < 0) {
+                dev_err(pctrl->dev, "Config param %04x not supported on group %s\n",
+                        param, g->name);
+                return -ENOTSUPP;
+        }
+
+        return 0;
+}
+
+static int msm_config_get(struct pinctrl_dev *pctldev,
+                          unsigned int pin,
+                          unsigned long *config)
+{
+        dev_err(pctldev->dev, "pin_config_set op not supported\n");
+        return -ENOTSUPP;
+}
+
+static int msm_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
+                                unsigned long *configs, unsigned num_configs)
+{
+        dev_err(pctldev->dev, "pin_config_set op not supported\n");
+        return -ENOTSUPP;
+}
+
+#define MSM_NO_PULL     0
+#define MSM_PULL_DOWN   1
+#define MSM_PULL_UP     3
+
+static const unsigned msm_regval_to_drive[] = { 2, 4, 6, 8, 10, 12, 14, 16 };
+static const unsigned msm_drive_to_regval[] = { -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1, 5, -1, 6, -1, 7 };
+
+static int msm_config_group_get(struct pinctrl_dev *pctldev,
+                                unsigned int group,
+                                unsigned long *config)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+        unsigned param = pinconf_to_config_param(*config);
+        unsigned mask;
+        unsigned arg;
+        unsigned bit;
+        unsigned reg;
+        int ret;
+        u32 val;
+
+        g = &pctrl->soc->groups[group];
+
+        ret = msm_config_reg(pctrl, g, param, &reg, &mask, &bit);
+        if (ret < 0)
+                return ret;
+
+        val = readl(pctrl->regs + reg);
+        arg = (val >> bit) & mask;
+
+        /* Convert register value to pinconf value */
+        switch (param) {
+        case PIN_CONFIG_BIAS_DISABLE:
+                arg = arg == MSM_NO_PULL;
+                break;
+        case PIN_CONFIG_BIAS_PULL_DOWN:
+                arg = arg == MSM_PULL_DOWN;
+                break;
+        case PIN_CONFIG_BIAS_PULL_UP:
+                arg = arg == MSM_PULL_UP;
+                break;
+        case PIN_CONFIG_DRIVE_STRENGTH:
+                arg = msm_regval_to_drive[arg];
+                break;
+        default:
+                dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
+                        param);
+                return -EINVAL;
+        }
+
+        *config = pinconf_to_config_packed(param, arg);
+
+        return 0;
+}
+
+static int msm_config_group_set(struct pinctrl_dev *pctldev,
+                                unsigned group,
+                                unsigned long *configs,
+                                unsigned num_configs)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+        unsigned long flags;
+        unsigned param;
+        unsigned mask;
+        unsigned arg;
+        unsigned bit;
+        unsigned reg;
+        int ret;
+        u32 val;
+        int i;
+
+        g = &pctrl->soc->groups[group];
+
+        for (i = 0; i < num_configs; i++) {
+                param = pinconf_to_config_param(configs[i]);
+                arg = pinconf_to_config_argument(configs[i]);
+
+                ret = msm_config_reg(pctrl, g, param, &reg, &mask, &bit);
+                if (ret < 0)
+                        return ret;
+
+                /* Convert pinconf values to register values */
+                switch (param) {
+                case PIN_CONFIG_BIAS_DISABLE:
+                        arg = MSM_NO_PULL;
+                        break;
+                case PIN_CONFIG_BIAS_PULL_DOWN:
+                        arg = MSM_PULL_DOWN;
+                        break;
+                case PIN_CONFIG_BIAS_PULL_UP:
+                        arg = MSM_PULL_UP;
+                        break;
+                case PIN_CONFIG_DRIVE_STRENGTH:
+                        /* Check for invalid values */
+                        if (arg > ARRAY_SIZE(msm_drive_to_regval))
+                                arg = -1;
+                        else
+                                arg = msm_drive_to_regval[arg];
+                        break;
+                default:
+                        dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
+                                param);
+                        return -EINVAL;
+                }
+
+                /* Range-check user-supplied value */
+                if (arg & ~mask) {
+                        dev_err(pctrl->dev, "config %x: %x is invalid\n", param, arg);
+                        return -EINVAL;
+                }
+
+                spin_lock_irqsave(&pctrl->lock, flags);
+                val = readl(pctrl->regs + reg);
+                val &= ~(mask << bit);
+                val |= arg << bit;
+                writel(val, pctrl->regs + reg);
+                spin_unlock_irqrestore(&pctrl->lock, flags);
+        }
+
+        return 0;
+}
+
+static struct pinconf_ops msm_pinconf_ops = {
+        .pin_config_get         = msm_config_get,
+        .pin_config_set         = msm_config_set,
+        .pin_config_group_get   = msm_config_group_get,
+        .pin_config_group_set   = msm_config_group_set,
+};
+
+static struct pinctrl_desc msm_pinctrl_desc = {
+        .pctlops = &msm_pinctrl_ops,
+        .pmxops = &msm_pinmux_ops,
+        .confops = &msm_pinconf_ops,
+        .owner = THIS_MODULE,
+};
+
+static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
+        unsigned long flags;
+        u32 val;
+
+        if (WARN_ON(offset >= pctrl->soc->ngroups))
+                return -EINVAL;
+
+        g = &pctrl->soc->groups[offset];
+
+        if (WARN_ON(g->oe_bit < 0))
+                return -EINVAL;
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        val = readl(pctrl->regs + g->ctl_reg);
+        val &= ~BIT(g->oe_bit);
+        writel(val, pctrl->regs + g->ctl_reg);
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+
+        return 0;
+}
+
+static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
+        unsigned long flags;
+        u32 val;
+
+        if (WARN_ON(offset >= pctrl->soc->ngroups))
+                return -EINVAL;
+
+        g = &pctrl->soc->groups[offset];
+
+        if (WARN_ON(g->oe_bit < 0))
+                return -EINVAL;
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        writel(value ? BIT(g->out_bit) : 0, pctrl->regs + g->io_reg);
+
+        val = readl(pctrl->regs + g->ctl_reg);
+        val |= BIT(g->oe_bit);
+        writel(val, pctrl->regs + g->ctl_reg);
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+
+        return 0;
+}
+
+static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
+        u32 val;
+
+        if (WARN_ON(offset >= pctrl->soc->ngroups))
+                return -EINVAL;
+
+        g = &pctrl->soc->groups[offset];
+
+        val = readl(pctrl->regs + g->io_reg);
+        return !!(val & BIT(g->in_bit));
+}
+
+static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
+        unsigned long flags;
+        u32 val;
+
+        if (WARN_ON(offset >= pctrl->soc->ngroups))
+                return;
+
+        g = &pctrl->soc->groups[offset];
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        val = readl(pctrl->regs + g->io_reg);
+        val |= BIT(g->out_bit);
+        writel(val, pctrl->regs + g->io_reg);
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+        struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
+
+        return irq_find_mapping(pctrl->domain, offset);
+}
+
+static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+        int gpio = chip->base + offset;
+        return pinctrl_request_gpio(gpio);
+}
+
+static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+        int gpio = chip->base + offset;
+        return pinctrl_free_gpio(gpio);
+}
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/seq_file.h>
+
+static void msm_gpio_dbg_show_one(struct seq_file *s,
+                                  struct pinctrl_dev *pctldev,
+                                  struct gpio_chip *chip,
+                                  unsigned offset,
+                                  unsigned gpio)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
+        unsigned func;
+        int is_out;
+        int drive;
+        int pull;
+        u32 ctl_reg;
+
+        const char *pulls[] = {
+                "no pull",
+                "pull down",
+                "keeper",
+                "pull up"
+        };
+
+        g = &pctrl->soc->groups[offset];
+        ctl_reg = readl(pctrl->regs + g->ctl_reg);
+
+        is_out = !!(ctl_reg & BIT(g->oe_bit));
+        func = (ctl_reg >> g->mux_bit) & 7;
+        drive = (ctl_reg >> g->drv_bit) & 7;
+        pull = (ctl_reg >> g->pull_bit) & 3;
+
+        seq_printf(s, " %-8s: %-3s %d", g->name, is_out ? "out" : "in", func);
+        seq_printf(s, " %dmA", msm_regval_to_drive[drive]);
+        seq_printf(s, " %s", pulls[pull]);
+}
+
+static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+        unsigned gpio = chip->base;
+        unsigned i;
+
+        for (i = 0; i < chip->ngpio; i++, gpio++) {
+                msm_gpio_dbg_show_one(s, NULL, chip, i, gpio);
+                seq_printf(s, "\n");
+        }
+}
+
+#else
+#define msm_gpio_dbg_show NULL
+#endif
+
+static struct gpio_chip msm_gpio_template = {
+        .direction_input  = msm_gpio_direction_input,
+        .direction_output = msm_gpio_direction_output,
+        .get              = msm_gpio_get,
+        .set              = msm_gpio_set,
+        .to_irq           = msm_gpio_to_irq,
+        .request          = msm_gpio_request,
+        .free             = msm_gpio_free,
+        .dbg_show         = msm_gpio_dbg_show,
+};
+
+/* For dual-edge interrupts in software, since some hardware has no
+ * such support:
+ *
+ * At appropriate moments, this function may be called to flip the polarity
+ * settings of both-edge irq lines to try and catch the next edge.
+ *
+ * The attempt is considered successful if:
+ * - the status bit goes high, indicating that an edge was caught, or
+ * - the input value of the gpio doesn't change during the attempt.
+ * If the value changes twice during the process, that would cause the first
+ * test to fail but would force the second, as two opposite
+ * transitions would cause a detection no matter the polarity setting.
+ *
+ * The do-loop tries to sledge-hammer closed the timing hole between
+ * the initial value-read and the polarity-write - if the line value changes
+ * during that window, an interrupt is lost, the new polarity setting is
+ * incorrect, and the first success test will fail, causing a retry.
+ *
+ * Algorithm comes from Google's msmgpio driver.
+ */
+static void msm_gpio_update_dual_edge_pos(struct msm_pinctrl *pctrl,
+                                          const struct msm_pingroup *g,
+                                          struct irq_data *d)
+{
+        int loop_limit = 100;
+        unsigned val, val2, intstat;
+        unsigned pol;
+
+        do {
+                val = readl(pctrl->regs + g->io_reg) & BIT(g->in_bit);
+
+                pol = readl(pctrl->regs + g->intr_cfg_reg);
+                pol ^= BIT(g->intr_polarity_bit);
+                writel(pol, pctrl->regs + g->intr_cfg_reg);
+
+                val2 = readl(pctrl->regs + g->io_reg) & BIT(g->in_bit);
+                intstat = readl(pctrl->regs + g->intr_status_reg);
+                if (intstat || (val == val2))
+                        return;
+        } while (loop_limit-- > 0);
+        dev_err(pctrl->dev, "dual-edge irq failed to stabilize, %#08x != %#08x\n",
+                val, val2);
+}
+
+static void msm_gpio_irq_mask(struct irq_data *d)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl;
+        unsigned long flags;
+        u32 val;
+
+        pctrl = irq_data_get_irq_chip_data(d);
+        if (!pctrl)
+                return;
+
+        if (WARN_ON(d->hwirq >= pctrl->soc->ngroups))
+                return;
+
+        g = &pctrl->soc->groups[d->hwirq];
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        val = readl(pctrl->regs + g->intr_cfg_reg);
+        val &= ~BIT(g->intr_enable_bit);
+        writel(val, pctrl->regs + g->intr_cfg_reg);
+
+        clear_bit(d->hwirq, pctrl->enabled_irqs);
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static void msm_gpio_irq_unmask(struct irq_data *d)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl;
+        unsigned long flags;
+        u32 val;
+
+        pctrl = irq_data_get_irq_chip_data(d);
+        if (!pctrl)
+                return;
+
+        if (WARN_ON(d->hwirq >= pctrl->soc->ngroups))
+                return;
+
+        g = &pctrl->soc->groups[d->hwirq];
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        val = readl(pctrl->regs + g->intr_status_reg);
+        val &= ~BIT(g->intr_status_bit);
+        writel(val, pctrl->regs + g->intr_status_reg);
+
+        val = readl(pctrl->regs + g->intr_cfg_reg);
+        val |= BIT(g->intr_enable_bit);
+        writel(val, pctrl->regs + g->intr_cfg_reg);
+
+        set_bit(d->hwirq, pctrl->enabled_irqs);
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static void msm_gpio_irq_ack(struct irq_data *d)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl;
+        unsigned long flags;
+        u32 val;
+
+        pctrl = irq_data_get_irq_chip_data(d);
+        if (!pctrl)
+                return;
+
+        if (WARN_ON(d->hwirq >= pctrl->soc->ngroups))
+                return;
+
+        g = &pctrl->soc->groups[d->hwirq];
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        val = readl(pctrl->regs + g->intr_status_reg);
+        val &= ~BIT(g->intr_status_bit);
+        writel(val, pctrl->regs + g->intr_status_reg);
+
+        if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
+                msm_gpio_update_dual_edge_pos(pctrl, g, d);
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+#define INTR_TARGET_PROC_APPS    4
+
+static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl;
+        unsigned long flags;
+        u32 val;
+
+        pctrl = irq_data_get_irq_chip_data(d);
+        if (!pctrl)
+                return -EINVAL;
+
+        if (WARN_ON(d->hwirq >= pctrl->soc->ngroups))
+                return -EINVAL;
+
+        g = &pctrl->soc->groups[d->hwirq];
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        /*
+         * For hw without possibility of detecting both edges
+         */
+        if (g->intr_detection_width == 1 && type == IRQ_TYPE_EDGE_BOTH)
+                set_bit(d->hwirq, pctrl->dual_edge_irqs);
+        else
+                clear_bit(d->hwirq, pctrl->dual_edge_irqs);
+
+        /* Route interrupts to application cpu */
+        val = readl(pctrl->regs + g->intr_target_reg);
+        val &= ~(7 << g->intr_target_bit);
+        val |= INTR_TARGET_PROC_APPS << g->intr_target_bit;
+        writel(val, pctrl->regs + g->intr_target_reg);
+
+        /* Update configuration for gpio.
+         * RAW_STATUS_EN is left on for all gpio irqs. Due to the
+         * internal circuitry of TLMM, toggling the RAW_STATUS
+         * could cause the INTR_STATUS to be set for EDGE interrupts.
+         */
+        val = readl(pctrl->regs + g->intr_cfg_reg);
+        val |= BIT(g->intr_raw_status_bit);
+        if (g->intr_detection_width == 2) {
+                val &= ~(3 << g->intr_detection_bit);
+                val &= ~(1 << g->intr_polarity_bit);
+                switch (type) {
+                case IRQ_TYPE_EDGE_RISING:
+                        val |= 1 << g->intr_detection_bit;
+                        val |= BIT(g->intr_polarity_bit);
+                        break;
+                case IRQ_TYPE_EDGE_FALLING:
+                        val |= 2 << g->intr_detection_bit;
+                        val |= BIT(g->intr_polarity_bit);
+                        break;
+                case IRQ_TYPE_EDGE_BOTH:
+                        val |= 3 << g->intr_detection_bit;
+                        val |= BIT(g->intr_polarity_bit);
+                        break;
+                case IRQ_TYPE_LEVEL_LOW:
+                        break;
+                case IRQ_TYPE_LEVEL_HIGH:
+                        val |= BIT(g->intr_polarity_bit);
+                        break;
+                }
+        } else if (g->intr_detection_width == 1) {
+                val &= ~(1 << g->intr_detection_bit);
+                val &= ~(1 << g->intr_polarity_bit);
+                switch (type) {
+                case IRQ_TYPE_EDGE_RISING:
+                        val |= BIT(g->intr_detection_bit);
+                        val |= BIT(g->intr_polarity_bit);
+                        break;
+                case IRQ_TYPE_EDGE_FALLING:
+                        val |= BIT(g->intr_detection_bit);
+                        break;
+                case IRQ_TYPE_EDGE_BOTH:
+                        val |= BIT(g->intr_detection_bit);
+                        break;
+                case IRQ_TYPE_LEVEL_LOW:
+                        break;
+                case IRQ_TYPE_LEVEL_HIGH:
+                        val |= BIT(g->intr_polarity_bit);
+                        break;
+                }
+        } else {
+                BUG();
+        }
+        writel(val, pctrl->regs + g->intr_cfg_reg);
+
+        if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
+                msm_gpio_update_dual_edge_pos(pctrl, g, d);
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+
+        if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
+                __irq_set_handler_locked(d->irq, handle_level_irq);
+        else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
+                __irq_set_handler_locked(d->irq, handle_edge_irq);
+
+        return 0;
+}
+
+static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
+{
+        struct msm_pinctrl *pctrl;
+        unsigned long flags;
+        unsigned ngpio;
+
+        pctrl = irq_data_get_irq_chip_data(d);
+        if (!pctrl)
+                return -EINVAL;
+
+        ngpio = pctrl->chip.ngpio;
+
+        spin_lock_irqsave(&pctrl->lock, flags);
+
+        if (on) {
+                if (bitmap_empty(pctrl->wake_irqs, ngpio))
+                        enable_irq_wake(pctrl->irq);
+                set_bit(d->hwirq, pctrl->wake_irqs);
+        } else {
+                clear_bit(d->hwirq, pctrl->wake_irqs);
+                if (bitmap_empty(pctrl->wake_irqs, ngpio))
+                        disable_irq_wake(pctrl->irq);
+        }
+
+        spin_unlock_irqrestore(&pctrl->lock, flags);
+
+        return 0;
+}
+
+static unsigned int msm_gpio_irq_startup(struct irq_data *d)
+{
+        struct msm_pinctrl *pctrl = irq_data_get_irq_chip_data(d);
+
+        if (gpio_lock_as_irq(&pctrl->chip, d->hwirq)) {
+                dev_err(pctrl->dev, "unable to lock HW IRQ %lu for IRQ\n",
+                        d->hwirq);
+        }
+        msm_gpio_irq_unmask(d);
+        return 0;
+}
+
+static void msm_gpio_irq_shutdown(struct irq_data *d)
+{
+        struct msm_pinctrl *pctrl = irq_data_get_irq_chip_data(d);
+
+        msm_gpio_irq_mask(d);
+        gpio_unlock_as_irq(&pctrl->chip, d->hwirq);
+}
+
+static struct irq_chip msm_gpio_irq_chip = {
+        .name           = "msmgpio",
+        .irq_mask       = msm_gpio_irq_mask,
+        .irq_unmask     = msm_gpio_irq_unmask,
+        .irq_ack        = msm_gpio_irq_ack,
+        .irq_set_type   = msm_gpio_irq_set_type,
+        .irq_set_wake   = msm_gpio_irq_set_wake,
+        .irq_startup    = msm_gpio_irq_startup,
+        .irq_shutdown   = msm_gpio_irq_shutdown,
+};
+
+static void msm_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+        const struct msm_pingroup *g;
+        struct msm_pinctrl *pctrl = irq_desc_get_handler_data(desc);
+        struct irq_chip *chip = irq_get_chip(irq);
+        int irq_pin;
+        int handled = 0;
+        u32 val;
+        int i;
+
+        chained_irq_enter(chip, desc);
+
+        /*
+         * Each pin have it's own IRQ status register, so use
+         * enabled_irq bitmap to limit the number of reads.
+         */
+        for_each_set_bit(i, pctrl->enabled_irqs, pctrl->chip.ngpio) {
+                g = &pctrl->soc->groups[i];
+                val = readl(pctrl->regs + g->intr_status_reg);
+                if (val & BIT(g->intr_status_bit)) {
+                        irq_pin = irq_find_mapping(pctrl->domain, i);
+                        generic_handle_irq(irq_pin);
+                        handled++;
+                }
+        }
+
+        /* No interrutps where flagged */
+        if (handled == 0)
+                handle_bad_irq(irq, desc);
+
+        chained_irq_exit(chip, desc);
+}
+
+static int msm_gpio_init(struct msm_pinctrl *pctrl)
+{
+        struct gpio_chip *chip;
+        int irq;
+        int ret;
+        int i;
+        int r;
+
+        chip = &pctrl->chip;
+        chip->base = 0;
+        chip->ngpio = pctrl->soc->ngpios;
+        chip->label = dev_name(pctrl->dev);
+        chip->dev = pctrl->dev;
+        chip->owner = THIS_MODULE;
+        chip->of_node = pctrl->dev->of_node;
+
+        pctrl->enabled_irqs = devm_kzalloc(pctrl->dev,
+                                           sizeof(unsigned long) * BITS_TO_LONGS(chip->ngpio),
+                                           GFP_KERNEL);
+        if (!pctrl->enabled_irqs) {
+                dev_err(pctrl->dev, "Failed to allocate enabled_irqs bitmap\n");
+                return -ENOMEM;
+        }
+
+        pctrl->dual_edge_irqs = devm_kzalloc(pctrl->dev,
+                                             sizeof(unsigned long) * BITS_TO_LONGS(chip->ngpio),
+                                             GFP_KERNEL);
+        if (!pctrl->dual_edge_irqs) {
+                dev_err(pctrl->dev, "Failed to allocate dual_edge_irqs bitmap\n");
+                return -ENOMEM;
+        }
+
+        pctrl->wake_irqs = devm_kzalloc(pctrl->dev,
+                                        sizeof(unsigned long) * BITS_TO_LONGS(chip->ngpio),
+                                        GFP_KERNEL);
+        if (!pctrl->wake_irqs) {
+                dev_err(pctrl->dev, "Failed to allocate wake_irqs bitmap\n");
+                return -ENOMEM;
+        }
+
+        ret = gpiochip_add(&pctrl->chip);
+        if (ret) {
+                dev_err(pctrl->dev, "Failed register gpiochip\n");
+                return ret;
+        }
+
+        ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), 0, 0, chip->ngpio);
+        if (ret) {
+                dev_err(pctrl->dev, "Failed to add pin range\n");
+                return ret;
+        }
+
+        pctrl->domain = irq_domain_add_linear(pctrl->dev->of_node, chip->ngpio,
+                                              &irq_domain_simple_ops, NULL);
+        if (!pctrl->domain) {
+                dev_err(pctrl->dev, "Failed to register irq domain\n");
+                r = gpiochip_remove(&pctrl->chip);
+                return -ENOSYS;
+        }
+
+        for (i = 0; i < chip->ngpio; i++) {
+                irq = irq_create_mapping(pctrl->domain, i);
+                irq_set_chip_and_handler(irq, &msm_gpio_irq_chip, handle_edge_irq);
+                irq_set_chip_data(irq, pctrl);
+        }
+
+        irq_set_handler_data(pctrl->irq, pctrl);
+        irq_set_chained_handler(pctrl->irq, msm_gpio_irq_handler);
+
+        return 0;
+}
+
+int msm_pinctrl_probe(struct platform_device *pdev,
+                      const struct msm_pinctrl_soc_data *soc_data)
+{
+        struct msm_pinctrl *pctrl;
+        struct resource *res;
+        int ret;
+
+        pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
+        if (!pctrl) {
+                dev_err(&pdev->dev, "Can't allocate msm_pinctrl\n");
+                return -ENOMEM;
+        }
+        pctrl->dev = &pdev->dev;
+        pctrl->soc = soc_data;
+        pctrl->chip = msm_gpio_template;
+
+        spin_lock_init(&pctrl->lock);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        pctrl->regs = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(pctrl->regs))
+                return PTR_ERR(pctrl->regs);
+
+        pctrl->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+        if (pctrl->irq < 0) {
+                dev_err(&pdev->dev, "No interrupt defined for msmgpio\n");
+                return pctrl->irq;
+        }
+
+        msm_pinctrl_desc.name = dev_name(&pdev->dev);
+        msm_pinctrl_desc.pins = pctrl->soc->pins;
+        msm_pinctrl_desc.npins = pctrl->soc->npins;
+        pctrl->pctrl = pinctrl_register(&msm_pinctrl_desc, &pdev->dev, pctrl);
+        if (!pctrl->pctrl) {
+                dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
+                return -ENODEV;
+        }
+
+        ret = msm_gpio_init(pctrl);
+        if (ret) {
+                pinctrl_unregister(pctrl->pctrl);
+                return ret;
+        }
+
+        platform_set_drvdata(pdev, pctrl);
+
+        dev_dbg(&pdev->dev, "Probed Qualcomm pinctrl driver\n");
+
+        return 0;
+}
+EXPORT_SYMBOL(msm_pinctrl_probe);
+
+int msm_pinctrl_remove(struct platform_device *pdev)
+{
+        struct msm_pinctrl *pctrl = platform_get_drvdata(pdev);
+        int ret;
+
+        irq_set_chained_handler(pctrl->irq, NULL);
+        irq_domain_remove(pctrl->domain);
+        ret = gpiochip_remove(&pctrl->chip);
+        pinctrl_unregister(pctrl->pctrl);
+
+        return 0;
+}
+EXPORT_SYMBOL(msm_pinctrl_remove);
+
diff --git a/drivers/pinctrl/pinctrl-msm.h b/drivers/pinctrl/pinctrl-msm.h
new file mode 100644
index 000000000000..206e782e2daa
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-msm.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2013, Sony Mobile Communications AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+#ifndef __PINCTRL_MSM_H__
+#define __PINCTRL_MSM_H__
+
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/machine.h>
+
+/**
+ * struct msm_function - a pinmux function
+ * @name:    Name of the pinmux function.
+ * @groups:  List of pingroups for this function.
+ * @ngroups: Number of entries in @groups.
+ */
+struct msm_function {
+        const char *name;
+        const char * const *groups;
+        unsigned ngroups;
+};
+
+/**
+ * struct msm_pingroup - Qualcomm pingroup definition
+ * @name:                 Name of the pingroup.
+ * @pins:                 A list of pins assigned to this pingroup.
+ * @npins:                Number of entries in @pins.
+ * @funcs:                A list of pinmux functions that can be selected for
+ *                        this group. The index of the selected function is used
+ *                        for programming the function selector.
+ *                        Entries should be indices into the groups list of the
+ *                        struct msm_pinctrl_soc_data.
+ * @ctl_reg:              Offset of the register holding control bits for this group.
+ * @io_reg:               Offset of the register holding input/output bits for this group.
+ * @intr_cfg_reg:         Offset of the register holding interrupt configuration bits.
+ * @intr_status_reg:      Offset of the register holding the status bits for this group.
+ * @intr_target_reg:      Offset of the register specifying routing of the interrupts
+ *                        from this group.
+ * @mux_bit:              Offset in @ctl_reg for the pinmux function selection.
+ * @pull_bit:             Offset in @ctl_reg for the bias configuration.
+ * @drv_bit:              Offset in @ctl_reg for the drive strength configuration.
+ * @oe_bit:               Offset in @ctl_reg for controlling output enable.
+ * @in_bit:               Offset in @io_reg for the input bit value.
+ * @out_bit:              Offset in @io_reg for the output bit value.
+ * @intr_enable_bit:      Offset in @intr_cfg_reg for enabling the interrupt for this group.
+ * @intr_status_bit:      Offset in @intr_status_reg for reading and acking the interrupt
+ *                        status.
+ * @intr_target_bit:      Offset in @intr_target_reg for configuring the interrupt routing.
+ * @intr_raw_status_bit:  Offset in @intr_cfg_reg for the raw status bit.
+ * @intr_polarity_bit:    Offset in @intr_cfg_reg for specifying polarity of the interrupt.
+ * @intr_detection_bit:   Offset in @intr_cfg_reg for specifying interrupt type.
+ * @intr_detection_width: Number of bits used for specifying interrupt type,
+ *                        Should be 2 for SoCs that can detect both edges in hardware,
+ *                        otherwise 1.
+ */
+struct msm_pingroup {
+        const char *name;
+        const unsigned *pins;
+        unsigned npins;
+
+        unsigned funcs[8];
+
+        s16 ctl_reg;
+        s16 io_reg;
+        s16 intr_cfg_reg;
+        s16 intr_status_reg;
+        s16 intr_target_reg;
+
+        unsigned mux_bit:5;
+
+        unsigned pull_bit:5;
+        unsigned drv_bit:5;
+
+        unsigned oe_bit:5;
+        unsigned in_bit:5;
+        unsigned out_bit:5;
+
+        unsigned intr_enable_bit:5;
+        unsigned intr_status_bit:5;
+
+        unsigned intr_target_bit:5;
+        unsigned intr_raw_status_bit:5;
+        unsigned intr_polarity_bit:5;
+        unsigned intr_detection_bit:5;
+        unsigned intr_detection_width:5;
+};
+
+/**
+ * struct msm_pinctrl_soc_data - Qualcomm pin controller driver configuration
+ * @pins:       An array describing all pins the pin controller affects.
+ * @npins:      The number of entries in @pins.
+ * @functions:  An array describing all mux functions the SoC supports.
+ * @nfunctions: The number of entries in @functions.
+ * @groups:     An array describing all pin groups the pin SoC supports.
+ * @ngroups:    The numbmer of entries in @groups.
+ * @ngpio:      The number of pingroups the driver should expose as GPIOs.
+ */
+struct msm_pinctrl_soc_data {
+        const struct pinctrl_pin_desc *pins;
+        unsigned npins;
+        const struct msm_function *functions;
+        unsigned nfunctions;
+        const struct msm_pingroup *groups;
+        unsigned ngroups;
+        unsigned ngpios;
+};
+
+int msm_pinctrl_probe(struct platform_device *pdev,
+                      const struct msm_pinctrl_soc_data *soc_data);
+int msm_pinctrl_remove(struct platform_device *pdev);
+
+#endif