--- /dev/null
+/*
+ * 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/delay.h>
+#include <linux/err.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/spinlock.h>
+#include <linux/reboot.h>
+
+#include "../core.h"
+#include "../pinconf.h"
+#include "pinctrl-msm.h"
+#include "../pinctrl-utils.h"
+
+#define MAX_NR_GPIO 300
+#define PS_HOLD_OFFSET 0x820
+
+/**
+ * struct msm_pinctrl - state for a pinctrl-msm device
+ * @dev: device handle.
+ * @pctrl: pinctrl handle.
+ * @chip: gpiochip handle.
+ * @restart_nb: restart notifier block.
+ * @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.
+ * @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 gpio_chip chip;
+ struct notifier_block restart_nb;
+ int irq;
+
+ spinlock_t lock;
+
+ DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO);
+ DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO);
+
+ const struct msm_pinctrl_soc_data *soc;
+ void __iomem *regs;
+};
+
+static inline struct msm_pinctrl *to_msm_pinctrl(struct gpio_chip *gc)
+{
+ return container_of(gc, struct msm_pinctrl, chip);
+}
+
+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 const 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_set_mux(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];
+
+ for (i = 0; i < g->nfuncs; i++) {
+ if (g->funcs[i] == function)
+ break;
+ }
+
+ if (WARN_ON(i == g->nfuncs))
+ 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 const 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,
+ .set_mux = msm_pinmux_set_mux,
+};
+
+static int msm_config_reg(struct msm_pinctrl *pctrl,
+ const struct msm_pingroup *g,
+ unsigned param,
+ unsigned *mask,
+ unsigned *bit)
+{
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ case PIN_CONFIG_BIAS_BUS_HOLD:
+ case PIN_CONFIG_BIAS_PULL_UP:
+ *bit = g->pull_bit;
+ *mask = 3;
+ break;
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ *bit = g->drv_bit;
+ *mask = 7;
+ break;
+ case PIN_CONFIG_OUTPUT:
+ case PIN_CONFIG_INPUT_ENABLE:
+ *bit = g->oe_bit;
+ *mask = 1;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ return 0;
+}
+
+#define MSM_NO_PULL 0
+#define MSM_PULL_DOWN 1
+#define MSM_KEEPER 2
+#define MSM_PULL_UP 3
+
+static unsigned msm_regval_to_drive(u32 val)
+{
+ return (val + 1) * 2;
+}
+
+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;
+ 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 + g->ctl_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_BUS_HOLD:
+ arg = arg == MSM_KEEPER;
+ 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;
+ case PIN_CONFIG_OUTPUT:
+ /* Pin is not output */
+ if (!arg)
+ return -EINVAL;
+
+ val = readl(pctrl->regs + g->io_reg);
+ arg = !!(val & BIT(g->in_bit));
+ break;
+ case PIN_CONFIG_INPUT_ENABLE:
+ /* Pin is output */
+ if (arg)
+ return -EINVAL;
+ arg = 1;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ *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;
+ 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_BUS_HOLD:
+ arg = MSM_KEEPER;
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ arg = MSM_PULL_UP;
+ break;
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ /* Check for invalid values */
+ if (arg > 16 || arg < 2 || (arg % 2) != 0)
+ arg = -1;
+ else
+ arg = (arg / 2) - 1;
+ break;
+ case PIN_CONFIG_OUTPUT:
+ /* set output value */
+ spin_lock_irqsave(&pctrl->lock, flags);
+ val = readl(pctrl->regs + g->io_reg);
+ if (arg)
+ val |= BIT(g->out_bit);
+ else
+ val &= ~BIT(g->out_bit);
+ writel(val, pctrl->regs + g->io_reg);
+ spin_unlock_irqrestore(&pctrl->lock, flags);
+
+ /* enable output */
+ arg = 1;
+ break;
+ case PIN_CONFIG_INPUT_ENABLE:
+ /* disable output */
+ arg = 0;
+ 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 + g->ctl_reg);
+ val &= ~(mask << bit);
+ val |= arg << bit;
+ writel(val, pctrl->regs + g->ctl_reg);
+ spin_unlock_irqrestore(&pctrl->lock, flags);
+ }
+
+ return 0;
+}
+
+static const struct pinconf_ops msm_pinconf_ops = {
+ .is_generic = true,
+ .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;
+
+ g = &pctrl->soc->groups[offset];
+
+ 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;
+
+ g = &pctrl->soc->groups[offset];
+
+ spin_lock_irqsave(&pctrl->lock, flags);
+
+ val = readl(pctrl->regs + g->io_reg);
+ if (value)
+ val |= BIT(g->out_bit);
+ else
+ val &= ~BIT(g->out_bit);
+ writel(val, 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;
+
+ 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;
+
+ g = &pctrl->soc->groups[offset];
+
+ spin_lock_irqsave(&pctrl->lock, flags);
+
+ val = readl(pctrl->regs + g->io_reg);
+ if (value)
+ val |= BIT(g->out_bit);
+ else
+ val &= ~BIT(g->out_bit);
+ writel(val, pctrl->regs + g->io_reg);
+
+ spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+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;
+
+ static const char * const 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_puts(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,
+ .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)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
+ const struct msm_pingroup *g;
+ unsigned long flags;
+ u32 val;
+
+ 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)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
+ const struct msm_pingroup *g;
+ unsigned long flags;
+ u32 val;
+
+ 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)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
+ const struct msm_pingroup *g;
+ unsigned long flags;
+ u32 val;
+
+ g = &pctrl->soc->groups[d->hwirq];
+
+ spin_lock_irqsave(&pctrl->lock, flags);
+
+ val = readl(pctrl->regs + g->intr_status_reg);
+ if (g->intr_ack_high)
+ val |= BIT(g->intr_status_bit);
+ else
+ 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);
+}
+
+static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
+ const struct msm_pingroup *g;
+ unsigned long flags;
+ u32 val;
+
+ 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 |= g->intr_target_kpss_val << 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);
+ 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 {
+ 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 gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&pctrl->lock, flags);
+
+ irq_set_irq_wake(pctrl->irq, on);
+
+ 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 void msm_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+ const struct msm_pingroup *g;
+ struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
+ 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 has 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(gc->irqdomain, i);
+ generic_handle_irq(irq_pin);
+ handled++;
+ }
+ }
+
+ /* No interrupts were 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 ret;
+ unsigned ngpio = pctrl->soc->ngpios;
+
+ if (WARN_ON(ngpio > MAX_NR_GPIO))
+ return -EINVAL;
+
+ chip = &pctrl->chip;
+ chip->base = 0;
+ chip->ngpio = ngpio;
+ chip->label = dev_name(pctrl->dev);
+ chip->dev = pctrl->dev;
+ chip->owner = THIS_MODULE;
+ chip->of_node = pctrl->dev->of_node;
+
+ 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");
+ gpiochip_remove(&pctrl->chip);
+ return ret;
+ }
+
+ ret = gpiochip_irqchip_add(chip,
+ &msm_gpio_irq_chip,
+ 0,
+ handle_edge_irq,
+ IRQ_TYPE_NONE);
+ if (ret) {
+ dev_err(pctrl->dev, "Failed to add irqchip to gpiochip\n");
+ gpiochip_remove(&pctrl->chip);
+ return -ENOSYS;
+ }
+
+ gpiochip_set_chained_irqchip(chip, &msm_gpio_irq_chip, pctrl->irq,
+ msm_gpio_irq_handler);
+
+ return 0;
+}
+
+static int msm_ps_hold_restart(struct notifier_block *nb, unsigned long action,
+ void *data)
+{
+ struct msm_pinctrl *pctrl = container_of(nb, struct msm_pinctrl, restart_nb);
+
+ writel(0, pctrl->regs + PS_HOLD_OFFSET);
+ mdelay(1000);
+ return NOTIFY_DONE;
+}
+
+static void msm_pinctrl_setup_pm_reset(struct msm_pinctrl *pctrl)
+{
+ int i;
+ const struct msm_function *func = pctrl->soc->functions;
+
+ for (i = 0; i < pctrl->soc->nfunctions; i++)
+ if (!strcmp(func[i].name, "ps_hold")) {
+ pctrl->restart_nb.notifier_call = msm_ps_hold_restart;
+ pctrl->restart_nb.priority = 128;
+ if (register_restart_handler(&pctrl->restart_nb))
+ dev_err(pctrl->dev,
+ "failed to setup restart handler.\n");
+ break;
+ }
+}
+
+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);
+
+ msm_pinctrl_setup_pm_reset(pctrl);
+
+ pctrl->irq = platform_get_irq(pdev, 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);
+
+ gpiochip_remove(&pctrl->chip);
+ pinctrl_unregister(pctrl->pctrl);
+
+ unregister_restart_handler(&pctrl->restart_nb);
+
+ return 0;
+}
+EXPORT_SYMBOL(msm_pinctrl_remove);
+
Code Review / kvmfornfv.git / blobdiff