This adds a pinctrl, pinmux, pinconf and gpiolib driver for the
Qualcomm TLMM block.
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
---
drivers/pinctrl/Kconfig | 6 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-msm.c | 1118 +++++++++++++++++++++++++++++++++++++++++
drivers/pinctrl/pinctrl-msm.h | 123 +++++
4 files changed, 1248 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-msm.c
create mode 100644 drivers/pinctrl/pinctrl-msm.h
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index b6e864e..782b8d3 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -152,6 +152,12 @@ 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 496d9bf..c0a809a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_PINCTRL_FALCON) += pinctrl-falcon.o
obj-$(CONFIG_PINCTRL_MXS) += pinctrl-mxs.o
obj-$(CONFIG_PINCTRL_IMX23) += pinctrl-imx23.o
obj-$(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 0000000..9cd8bd4
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-msm.c
@@ -0,0 +1,1118 @@
+/*
+ * Copyright (c) 2013, Sony Mobile Communications AB.
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2011-2012, NVIDIA CORPORATION. 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/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: Summary irq for the TLMM 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 int msm_dt_subnode_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps)
+{
+ struct device *dev = pctldev->dev;
+ unsigned long *configs = NULL;
+ struct property *prop;
+ const char *function;
+ unsigned num_configs = 0;
+ const char *group;
+ unsigned reserve;
+ int ret;
+
+ ret = of_property_read_string(np, "qcom,function", &function);
+ if (ret < 0) {
+ /* EINVAL=missing, which is fine since it's optional */
+ if (ret != -EINVAL)
+ dev_err(dev, "unable to parse qcom,function\n");
+ function = NULL;
+ }
+
+ ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
+ if (ret) {
+ dev_err(dev, "unable to parse properties\n");
+ goto exit;
+ }
+
+ reserve = 0;
+ if (function != NULL)
+ reserve++;
+ if (num_configs)
+ reserve++;
+
+ ret = of_property_count_strings(np, "qcom,pins");
+ if (ret < 0) {
+ dev_err(dev, "unable to parse qcom,pins");
+ goto exit;
+ }
+ reserve *= ret;
+
+ ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
+ num_maps, reserve);
+ if (ret < 0)
+ goto exit;
+
+ of_property_for_each_string(np, "qcom,pins", prop, group) {
+ if (function) {
+ ret = pinctrl_utils_add_map_mux(pctldev, map,
+ reserved_maps, num_maps, group,
+ function);
+ if (ret < 0)
+ goto exit;
+ }
+
+ if (num_configs) {
+ ret = pinctrl_utils_add_map_configs(pctldev, map,
+ reserved_maps, num_maps, group,
+ configs, num_configs,
+ PIN_MAP_TYPE_CONFIGS_GROUP);
+ if (ret < 0)
+ goto exit;
+ }
+ }
+
+ ret = 0;
+
+exit:
+ kfree(configs);
+ return ret;
+}
+
+static int msm_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map,
+ unsigned *num_maps)
+{
+ unsigned reserved_maps;
+ struct device_node *np;
+ int ret;
+
+ reserved_maps = 0;
+ *map = NULL;
+ *num_maps = 0;
+
+ for_each_child_of_node(np_config, np) {
+ ret = msm_dt_subnode_to_map(pctldev, np, map,
+ &reserved_maps, num_maps);
+ if (ret < 0) {
+ pinctrl_utils_dt_free_map(pctldev, *map,
+ *num_maps);
+ return ret;
+ }
+ }
+
+ 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 = msm_dt_node_to_map,
+ .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, ®, &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, ®, &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);
+
+ val = !!value << 1;
+ 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_create_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 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,
+};
+
+static irqreturn_t msm_gpio_irq_handler(int irq, void *data)
+{
+ const struct msm_pingroup *g;
+ struct msm_pinctrl *pctrl = data;
+ struct irq_chip *chip = irq_get_chip(irq);
+ struct irq_desc *desc = irq_to_desc(irq);
+ int ngpio;
+ u32 val;
+ int i;
+
+ ngpio = pctrl->chip.ngpio;;
+
+ chained_irq_enter(chip, desc);
+
+ for_each_set_bit(i, pctrl->enabled_irqs, ngpio) {
+ g = &pctrl->soc->groups[i];
+ val = readl(pctrl->regs + g->intr_status_reg);
+ if (val & BIT(g->intr_status_bit))
+ generic_handle_irq(msm_gpio_to_irq(&pctrl->chip, i));
+ }
+
+ chained_irq_exit(chip, desc);
+ return IRQ_HANDLED;
+}
+
+static int msm_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ struct msm_pinctrl *pctrl = d->host_data;
+
+ if (!pctrl)
+ return -EINVAL;
+
+ irq_set_chip_and_handler(irq, &msm_gpio_irq_chip, handle_edge_irq);
+ set_irq_flags(irq, IRQF_VALID);
+ irq_set_chip_data(irq, pctrl);
+ irq_set_irq_type(irq, IRQ_TYPE_EDGE_FALLING);
+
+ return 0;
+}
+
+static const struct irq_domain_ops msm_gpio_irq_simple_ops = {
+ .map = msm_gpio_irq_map,
+ .xlate = irq_domain_xlate_twocell,
+};
+
+static int msm_gpio_init(struct msm_pinctrl *pctrl)
+{
+ struct gpio_chip *chip;
+ int ret;
+ int r;
+
+ chip = &pctrl->chip;
+ chip->base = 0;
+ chip->ngpio = pctrl->soc->gpio_range->npins;
+ 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;
+ }
+
+ pctrl->domain = irq_domain_add_simple(chip->of_node,
+ chip->ngpio,
+ 0,
+ &msm_gpio_irq_simple_ops,
+ pctrl);
+ if (!pctrl->domain) {
+ dev_err(pctrl->dev, "Failed to register irq domain\n");
+ r = gpiochip_remove(&pctrl->chip);
+ return -ENOSYS;
+ }
+
+ 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;
+ int r;
+
+ 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 = platform_get_irq(pdev, 0);
+ if (pctrl->irq < 0) {
+ dev_err(&pdev->dev, "No interrupt defined for msmgpio\n");
+ return pctrl->irq;
+ }
+
+ ret = devm_request_irq(&pdev->dev,
+ pctrl->irq,
+ msm_gpio_irq_handler,
+ IRQF_TRIGGER_HIGH,
+ dev_name(&pdev->dev),
+ pctrl);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request TLMM irq\n");
+ return ret;
+ }
+
+ ret = msm_gpio_init(pctrl);
+ if (ret)
+ return ret;
+
+ 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");
+ irq_domain_remove(pctrl->domain);
+ r = gpiochip_remove(&pctrl->chip);
+ return -ENODEV;
+ }
+
+ pinctrl_add_gpio_range(pctrl->pctrl, soc_data->gpio_range);
+
+ 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_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 0000000..04546cd
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-msm.h
@@ -0,0 +1,123 @@
+/*
+ * 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.
+ * @gpio_range: The range 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;
+ struct pinctrl_gpio_range *gpio_range;
+};
+
+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
+
--
1.8.2.2
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