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|
/*
* 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 <linux/pm.h>
#include <linux/log2.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 pinctrl_desc desc;
struct notifier_block restart_nb;
struct irq_chip irq_chip;
int irq;
raw_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 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_free_map,
};
static int msm_pinmux_request(struct pinctrl_dev *pctldev, unsigned offset)
{
struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
struct gpio_chip *chip = &pctrl->chip;
return gpiochip_line_is_valid(chip, offset) ? 0 : -EINVAL;
}
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, mask;
int i;
g = &pctrl->soc->groups[group];
mask = GENMASK(g->mux_bit + order_base_2(g->nfuncs) - 1, g->mux_bit);
for (i = 0; i < g->nfuncs; i++) {
if (g->funcs[i] == function)
break;
}
if (WARN_ON(i == g->nfuncs))
return -EINVAL;
raw_spin_lock_irqsave(&pctrl->lock, flags);
val = readl(pctrl->regs + g->ctl_reg);
val &= ~mask;
val |= i << g->mux_bit;
writel(val, pctrl->regs + g->ctl_reg);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return 0;
}
static int msm_pinmux_request_gpio(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
const struct msm_pingroup *g = &pctrl->soc->groups[offset];
/* No funcs? Probably ACPI so can't do anything here */
if (!g->nfuncs)
return 0;
/* For now assume function 0 is GPIO because it always is */
return msm_pinmux_set_mux(pctldev, 0, offset);
}
static const struct pinmux_ops msm_pinmux_ops = {
.request = msm_pinmux_request,
.get_functions_count = msm_get_functions_count,
.get_function_name = msm_get_function_name,
.get_function_groups = msm_get_function_groups,
.gpio_request_enable = msm_pinmux_request_gpio,
.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_NO_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:
if (arg != MSM_NO_PULL)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if (arg != MSM_PULL_DOWN)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_BUS_HOLD:
if (pctrl->soc->pull_no_keeper)
return -ENOTSUPP;
if (arg != MSM_KEEPER)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_PULL_UP:
if (pctrl->soc->pull_no_keeper)
arg = arg == MSM_PULL_UP_NO_KEEPER;
else
arg = arg == MSM_PULL_UP;
if (!arg)
return -EINVAL;
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:
if (pctrl->soc->pull_no_keeper)
return -ENOTSUPP;
arg = MSM_KEEPER;
break;
case PIN_CONFIG_BIAS_PULL_UP:
if (pctrl->soc->pull_no_keeper)
arg = MSM_PULL_UP_NO_KEEPER;
else
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 */
raw_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);
raw_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;
}
raw_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);
raw_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 int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
const struct msm_pingroup *g;
struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
unsigned long flags;
u32 val;
g = &pctrl->soc->groups[offset];
raw_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);
raw_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 = gpiochip_get_data(chip);
unsigned long flags;
u32 val;
g = &pctrl->soc->groups[offset];
raw_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);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return 0;
}
static int msm_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
{
struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
const struct msm_pingroup *g;
u32 val;
g = &pctrl->soc->groups[offset];
val = readl(pctrl->regs + g->ctl_reg);
/* 0 = output, 1 = input */
return val & BIT(g->oe_bit) ? 0 : 1;
}
static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
{
const struct msm_pingroup *g;
struct msm_pinctrl *pctrl = gpiochip_get_data(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 = gpiochip_get_data(chip);
unsigned long flags;
u32 val;
g = &pctrl->soc->groups[offset];
raw_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);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
}
#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 = gpiochip_get_data(chip);
unsigned func;
int is_out;
int drive;
int pull;
int val;
u32 ctl_reg, io_reg;
static const char * const pulls_keeper[] = {
"no pull",
"pull down",
"keeper",
"pull up"
};
static const char * const pulls_no_keeper[] = {
"no pull",
"pull down",
"pull up",
};
if (!gpiochip_line_is_valid(chip, offset))
return;
g = &pctrl->soc->groups[offset];
ctl_reg = readl(pctrl->regs + g->ctl_reg);
io_reg = readl(pctrl->regs + g->io_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;
if (is_out)
val = !!(io_reg & BIT(g->out_bit));
else
val = !!(io_reg & BIT(g->in_bit));
seq_printf(s, " %-8s: %-3s", g->name, is_out ? "out" : "in");
seq_printf(s, " %-4s func%d", val ? "high" : "low", func);
seq_printf(s, " %dmA", msm_regval_to_drive(drive));
if (pctrl->soc->pull_no_keeper)
seq_printf(s, " %s", pulls_no_keeper[pull]);
else
seq_printf(s, " %s", pulls_keeper[pull]);
seq_puts(s, "\n");
}
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);
}
#else
#define msm_gpio_dbg_show NULL
#endif
static const struct gpio_chip msm_gpio_template = {
.direction_input = msm_gpio_direction_input,
.direction_output = msm_gpio_direction_output,
.get_direction = msm_gpio_get_direction,
.get = msm_gpio_get,
.set = msm_gpio_set,
.request = gpiochip_generic_request,
.free = gpiochip_generic_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 = gpiochip_get_data(gc);
const struct msm_pingroup *g;
unsigned long flags;
u32 val;
g = &pctrl->soc->groups[d->hwirq];
raw_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);
raw_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 = gpiochip_get_data(gc);
const struct msm_pingroup *g;
unsigned long flags;
u32 val;
g = &pctrl->soc->groups[d->hwirq];
raw_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);
set_bit(d->hwirq, pctrl->enabled_irqs);
raw_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 = gpiochip_get_data(gc);
const struct msm_pingroup *g;
unsigned long flags;
u32 val;
g = &pctrl->soc->groups[d->hwirq];
raw_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);
raw_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 = gpiochip_get_data(gc);
const struct msm_pingroup *g;
unsigned long flags;
u32 val;
g = &pctrl->soc->groups[d->hwirq];
raw_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);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
irq_set_handler_locked(d, handle_level_irq);
else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
irq_set_handler_locked(d, 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 = gpiochip_get_data(gc);
unsigned long flags;
raw_spin_lock_irqsave(&pctrl->lock, flags);
irq_set_irq_wake(pctrl->irq, on);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
return 0;
}
static int msm_gpio_irq_reqres(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
int ret;
if (!try_module_get(gc->owner))
return -ENODEV;
ret = msm_pinmux_request_gpio(pctrl->pctrl, NULL, d->hwirq);
if (ret)
goto out;
msm_gpio_direction_input(gc, d->hwirq);
if (gpiochip_lock_as_irq(gc, d->hwirq)) {
dev_err(gc->parent,
"unable to lock HW IRQ %lu for IRQ\n",
d->hwirq);
ret = -EINVAL;
goto out;
}
return 0;
out:
module_put(gc->owner);
return ret;
}
static void msm_gpio_irq_relres(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
gpiochip_unlock_as_irq(gc, d->hwirq);
module_put(gc->owner);
}
static void msm_gpio_irq_handler(struct irq_desc *desc)
{
struct gpio_chip *gc = irq_desc_get_handler_data(desc);
const struct msm_pingroup *g;
struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
struct irq_chip *chip = irq_desc_get_chip(desc);
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->irq.domain, i);
generic_handle_irq(irq_pin);
handled++;
}
}
/* No interrupts were flagged */
if (handled == 0)
handle_bad_irq(desc);
chained_irq_exit(chip, desc);
}
static int msm_gpio_init_valid_mask(struct gpio_chip *chip,
struct msm_pinctrl *pctrl)
{
int ret;
unsigned int len, i;
unsigned int max_gpios = pctrl->soc->ngpios;
u16 *tmp;
/* The number of GPIOs in the ACPI tables */
len = ret = device_property_read_u16_array(pctrl->dev, "gpios", NULL, 0);
if (ret < 0)
return 0;
if (ret > max_gpios)
return -EINVAL;
tmp = kmalloc_array(len, sizeof(*tmp), GFP_KERNEL);
if (!tmp)
return -ENOMEM;
ret = device_property_read_u16_array(pctrl->dev, "gpios", tmp, len);
if (ret < 0) {
dev_err(pctrl->dev, "could not read list of GPIOs\n");
goto out;
}
bitmap_zero(chip->valid_mask, max_gpios);
for (i = 0; i < len; i++)
set_bit(tmp[i], chip->valid_mask);
out:
kfree(tmp);
return ret;
}
static bool msm_gpio_needs_valid_mask(struct msm_pinctrl *pctrl)
{
return device_property_read_u16_array(pctrl->dev, "gpios", NULL, 0) > 0;
}
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 = -1;
chip->ngpio = ngpio;
chip->label = dev_name(pctrl->dev);
chip->parent = pctrl->dev;
chip->owner = THIS_MODULE;
chip->of_node = pctrl->dev->of_node;
chip->need_valid_mask = msm_gpio_needs_valid_mask(pctrl);
pctrl->irq_chip.name = "msmgpio";
pctrl->irq_chip.irq_mask = msm_gpio_irq_mask;
pctrl->irq_chip.irq_unmask = msm_gpio_irq_unmask;
pctrl->irq_chip.irq_ack = msm_gpio_irq_ack;
pctrl->irq_chip.irq_set_type = msm_gpio_irq_set_type;
pctrl->irq_chip.irq_set_wake = msm_gpio_irq_set_wake;
pctrl->irq_chip.irq_request_resources = msm_gpio_irq_reqres;
pctrl->irq_chip.irq_release_resources = msm_gpio_irq_relres;
ret = gpiochip_add_data(&pctrl->chip, pctrl);
if (ret) {
dev_err(pctrl->dev, "Failed register gpiochip\n");
return ret;
}
ret = msm_gpio_init_valid_mask(chip, pctrl);
if (ret) {
dev_err(pctrl->dev, "Failed to setup irq valid bits\n");
gpiochip_remove(&pctrl->chip);
return ret;
}
/*
* For DeviceTree-supported systems, the gpio core checks the
* pinctrl's device node for the "gpio-ranges" property.
* If it is present, it takes care of adding the pin ranges
* for the driver. In this case the driver can skip ahead.
*
* In order to remain compatible with older, existing DeviceTree
* files which don't set the "gpio-ranges" property or systems that
* utilize ACPI the driver has to call gpiochip_add_pin_range().
*/
if (!of_property_read_bool(pctrl->dev->of_node, "gpio-ranges")) {
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,
&pctrl->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, &pctrl->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 struct msm_pinctrl *poweroff_pctrl;
static void msm_ps_hold_poweroff(void)
{
msm_ps_hold_restart(&poweroff_pctrl->restart_nb, 0, NULL);
}
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");
poweroff_pctrl = pctrl;
pm_power_off = msm_ps_hold_poweroff;
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)
return -ENOMEM;
pctrl->dev = &pdev->dev;
pctrl->soc = soc_data;
pctrl->chip = msm_gpio_template;
raw_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;
}
pctrl->desc.owner = THIS_MODULE;
pctrl->desc.pctlops = &msm_pinctrl_ops;
pctrl->desc.pmxops = &msm_pinmux_ops;
pctrl->desc.confops = &msm_pinconf_ops;
pctrl->desc.name = dev_name(&pdev->dev);
pctrl->desc.pins = pctrl->soc->pins;
pctrl->desc.npins = pctrl->soc->npins;
pctrl->pctrl = devm_pinctrl_register(&pdev->dev, &pctrl->desc, pctrl);
if (IS_ERR(pctrl->pctrl)) {
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
return PTR_ERR(pctrl->pctrl);
}
ret = msm_gpio_init(pctrl);
if (ret)
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);
unregister_restart_handler(&pctrl->restart_nb);
return 0;
}
EXPORT_SYMBOL(msm_pinctrl_remove);
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