linux/drivers/pinctrl/sirf/pinctrl-sirf.c

893 lines
23 KiB
C

/*
* pinmux driver for CSR SiRFprimaII
*
* Copyright (c) 2011 - 2014 Cambridge Silicon Radio Limited, a CSR plc group
* company.
*
* Licensed under GPLv2 or later.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/bitops.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include "pinctrl-sirf.h"
#define DRIVER_NAME "pinmux-sirf"
struct sirfsoc_gpio_bank {
int id;
int parent_irq;
spinlock_t lock;
};
struct sirfsoc_gpio_chip {
struct of_mm_gpio_chip chip;
struct sirfsoc_gpio_bank sgpio_bank[SIRFSOC_GPIO_NO_OF_BANKS];
spinlock_t lock;
};
static struct sirfsoc_pin_group *sirfsoc_pin_groups;
static int sirfsoc_pingrp_cnt;
static int sirfsoc_get_groups_count(struct pinctrl_dev *pctldev)
{
return sirfsoc_pingrp_cnt;
}
static const char *sirfsoc_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return sirfsoc_pin_groups[selector].name;
}
static int sirfsoc_get_group_pins(struct pinctrl_dev *pctldev,
unsigned selector,
const unsigned **pins,
unsigned *num_pins)
{
*pins = sirfsoc_pin_groups[selector].pins;
*num_pins = sirfsoc_pin_groups[selector].num_pins;
return 0;
}
static void sirfsoc_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned offset)
{
seq_printf(s, " " DRIVER_NAME);
}
static int sirfsoc_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map, unsigned *num_maps)
{
struct sirfsoc_pmx *spmx = pinctrl_dev_get_drvdata(pctldev);
struct device_node *np;
struct property *prop;
const char *function, *group;
int ret, index = 0, count = 0;
/* calculate number of maps required */
for_each_child_of_node(np_config, np) {
ret = of_property_read_string(np, "sirf,function", &function);
if (ret < 0) {
of_node_put(np);
return ret;
}
ret = of_property_count_strings(np, "sirf,pins");
if (ret < 0) {
of_node_put(np);
return ret;
}
count += ret;
}
if (!count) {
dev_err(spmx->dev, "No child nodes passed via DT\n");
return -ENODEV;
}
*map = kzalloc(sizeof(**map) * count, GFP_KERNEL);
if (!*map)
return -ENOMEM;
for_each_child_of_node(np_config, np) {
of_property_read_string(np, "sirf,function", &function);
of_property_for_each_string(np, "sirf,pins", prop, group) {
(*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
(*map)[index].data.mux.group = group;
(*map)[index].data.mux.function = function;
index++;
}
}
*num_maps = count;
return 0;
}
static void sirfsoc_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps)
{
kfree(map);
}
static struct pinctrl_ops sirfsoc_pctrl_ops = {
.get_groups_count = sirfsoc_get_groups_count,
.get_group_name = sirfsoc_get_group_name,
.get_group_pins = sirfsoc_get_group_pins,
.pin_dbg_show = sirfsoc_pin_dbg_show,
.dt_node_to_map = sirfsoc_dt_node_to_map,
.dt_free_map = sirfsoc_dt_free_map,
};
static struct sirfsoc_pmx_func *sirfsoc_pmx_functions;
static int sirfsoc_pmxfunc_cnt;
static void sirfsoc_pinmux_endisable(struct sirfsoc_pmx *spmx,
unsigned selector, bool enable)
{
int i;
const struct sirfsoc_padmux *mux =
sirfsoc_pmx_functions[selector].padmux;
const struct sirfsoc_muxmask *mask = mux->muxmask;
for (i = 0; i < mux->muxmask_counts; i++) {
u32 muxval;
muxval = readl(spmx->gpio_virtbase +
SIRFSOC_GPIO_PAD_EN(mask[i].group));
if (enable)
muxval = muxval & ~mask[i].mask;
else
muxval = muxval | mask[i].mask;
writel(muxval, spmx->gpio_virtbase +
SIRFSOC_GPIO_PAD_EN(mask[i].group));
}
if (mux->funcmask && enable) {
u32 func_en_val;
func_en_val =
readl(spmx->rsc_virtbase + mux->ctrlreg);
func_en_val =
(func_en_val & ~mux->funcmask) | (mux->funcval);
writel(func_en_val, spmx->rsc_virtbase + mux->ctrlreg);
}
}
static int sirfsoc_pinmux_set_mux(struct pinctrl_dev *pmxdev,
unsigned selector,
unsigned group)
{
struct sirfsoc_pmx *spmx;
spmx = pinctrl_dev_get_drvdata(pmxdev);
sirfsoc_pinmux_endisable(spmx, selector, true);
return 0;
}
static int sirfsoc_pinmux_get_funcs_count(struct pinctrl_dev *pmxdev)
{
return sirfsoc_pmxfunc_cnt;
}
static const char *sirfsoc_pinmux_get_func_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return sirfsoc_pmx_functions[selector].name;
}
static int sirfsoc_pinmux_get_groups(struct pinctrl_dev *pctldev,
unsigned selector,
const char * const **groups,
unsigned * const num_groups)
{
*groups = sirfsoc_pmx_functions[selector].groups;
*num_groups = sirfsoc_pmx_functions[selector].num_groups;
return 0;
}
static int sirfsoc_pinmux_request_gpio(struct pinctrl_dev *pmxdev,
struct pinctrl_gpio_range *range, unsigned offset)
{
struct sirfsoc_pmx *spmx;
int group = range->id;
u32 muxval;
spmx = pinctrl_dev_get_drvdata(pmxdev);
muxval = readl(spmx->gpio_virtbase +
SIRFSOC_GPIO_PAD_EN(group));
muxval = muxval | (1 << (offset - range->pin_base));
writel(muxval, spmx->gpio_virtbase +
SIRFSOC_GPIO_PAD_EN(group));
return 0;
}
static struct pinmux_ops sirfsoc_pinmux_ops = {
.set_mux = sirfsoc_pinmux_set_mux,
.get_functions_count = sirfsoc_pinmux_get_funcs_count,
.get_function_name = sirfsoc_pinmux_get_func_name,
.get_function_groups = sirfsoc_pinmux_get_groups,
.gpio_request_enable = sirfsoc_pinmux_request_gpio,
};
static struct pinctrl_desc sirfsoc_pinmux_desc = {
.name = DRIVER_NAME,
.pctlops = &sirfsoc_pctrl_ops,
.pmxops = &sirfsoc_pinmux_ops,
.owner = THIS_MODULE,
};
static void __iomem *sirfsoc_rsc_of_iomap(void)
{
const struct of_device_id rsc_ids[] = {
{ .compatible = "sirf,prima2-rsc" },
{}
};
struct device_node *np;
np = of_find_matching_node(NULL, rsc_ids);
if (!np)
panic("unable to find compatible rsc node in dtb\n");
return of_iomap(np, 0);
}
static int sirfsoc_gpio_of_xlate(struct gpio_chip *gc,
const struct of_phandle_args *gpiospec,
u32 *flags)
{
if (gpiospec->args[0] > SIRFSOC_GPIO_NO_OF_BANKS * SIRFSOC_GPIO_BANK_SIZE)
return -EINVAL;
if (flags)
*flags = gpiospec->args[1];
return gpiospec->args[0];
}
static const struct of_device_id pinmux_ids[] = {
{ .compatible = "sirf,prima2-pinctrl", .data = &prima2_pinctrl_data, },
{ .compatible = "sirf,atlas6-pinctrl", .data = &atlas6_pinctrl_data, },
{}
};
static int sirfsoc_pinmux_probe(struct platform_device *pdev)
{
int ret;
struct sirfsoc_pmx *spmx;
struct device_node *np = pdev->dev.of_node;
const struct sirfsoc_pinctrl_data *pdata;
/* Create state holders etc for this driver */
spmx = devm_kzalloc(&pdev->dev, sizeof(*spmx), GFP_KERNEL);
if (!spmx)
return -ENOMEM;
spmx->dev = &pdev->dev;
platform_set_drvdata(pdev, spmx);
spmx->gpio_virtbase = of_iomap(np, 0);
if (!spmx->gpio_virtbase) {
dev_err(&pdev->dev, "can't map gpio registers\n");
return -ENOMEM;
}
spmx->rsc_virtbase = sirfsoc_rsc_of_iomap();
if (!spmx->rsc_virtbase) {
ret = -ENOMEM;
dev_err(&pdev->dev, "can't map rsc registers\n");
goto out_no_rsc_remap;
}
pdata = of_match_node(pinmux_ids, np)->data;
sirfsoc_pin_groups = pdata->grps;
sirfsoc_pingrp_cnt = pdata->grps_cnt;
sirfsoc_pmx_functions = pdata->funcs;
sirfsoc_pmxfunc_cnt = pdata->funcs_cnt;
sirfsoc_pinmux_desc.pins = pdata->pads;
sirfsoc_pinmux_desc.npins = pdata->pads_cnt;
/* Now register the pin controller and all pins it handles */
spmx->pmx = pinctrl_register(&sirfsoc_pinmux_desc, &pdev->dev, spmx);
if (IS_ERR(spmx->pmx)) {
dev_err(&pdev->dev, "could not register SIRFSOC pinmux driver\n");
ret = PTR_ERR(spmx->pmx);
goto out_no_pmx;
}
dev_info(&pdev->dev, "initialized SIRFSOC pinmux driver\n");
return 0;
out_no_pmx:
iounmap(spmx->rsc_virtbase);
out_no_rsc_remap:
iounmap(spmx->gpio_virtbase);
return ret;
}
#ifdef CONFIG_PM_SLEEP
static int sirfsoc_pinmux_suspend_noirq(struct device *dev)
{
int i, j;
struct sirfsoc_pmx *spmx = dev_get_drvdata(dev);
for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
for (j = 0; j < SIRFSOC_GPIO_BANK_SIZE; j++) {
spmx->gpio_regs[i][j] = readl(spmx->gpio_virtbase +
SIRFSOC_GPIO_CTRL(i, j));
}
spmx->ints_regs[i] = readl(spmx->gpio_virtbase +
SIRFSOC_GPIO_INT_STATUS(i));
spmx->paden_regs[i] = readl(spmx->gpio_virtbase +
SIRFSOC_GPIO_PAD_EN(i));
}
spmx->dspen_regs = readl(spmx->gpio_virtbase + SIRFSOC_GPIO_DSP_EN0);
for (i = 0; i < 3; i++)
spmx->rsc_regs[i] = readl(spmx->rsc_virtbase + 4 * i);
return 0;
}
static int sirfsoc_pinmux_resume_noirq(struct device *dev)
{
int i, j;
struct sirfsoc_pmx *spmx = dev_get_drvdata(dev);
for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
for (j = 0; j < SIRFSOC_GPIO_BANK_SIZE; j++) {
writel(spmx->gpio_regs[i][j], spmx->gpio_virtbase +
SIRFSOC_GPIO_CTRL(i, j));
}
writel(spmx->ints_regs[i], spmx->gpio_virtbase +
SIRFSOC_GPIO_INT_STATUS(i));
writel(spmx->paden_regs[i], spmx->gpio_virtbase +
SIRFSOC_GPIO_PAD_EN(i));
}
writel(spmx->dspen_regs, spmx->gpio_virtbase + SIRFSOC_GPIO_DSP_EN0);
for (i = 0; i < 3; i++)
writel(spmx->rsc_regs[i], spmx->rsc_virtbase + 4 * i);
return 0;
}
static const struct dev_pm_ops sirfsoc_pinmux_pm_ops = {
.suspend_noirq = sirfsoc_pinmux_suspend_noirq,
.resume_noirq = sirfsoc_pinmux_resume_noirq,
.freeze_noirq = sirfsoc_pinmux_suspend_noirq,
.restore_noirq = sirfsoc_pinmux_resume_noirq,
};
#endif
static struct platform_driver sirfsoc_pinmux_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = pinmux_ids,
#ifdef CONFIG_PM_SLEEP
.pm = &sirfsoc_pinmux_pm_ops,
#endif
},
.probe = sirfsoc_pinmux_probe,
};
static int __init sirfsoc_pinmux_init(void)
{
return platform_driver_register(&sirfsoc_pinmux_driver);
}
arch_initcall(sirfsoc_pinmux_init);
static inline struct sirfsoc_gpio_bank *
sirfsoc_gpio_to_bank(struct sirfsoc_gpio_chip *sgpio, unsigned int offset)
{
return &sgpio->sgpio_bank[offset / SIRFSOC_GPIO_BANK_SIZE];
}
static inline int sirfsoc_gpio_to_bankoff(unsigned int offset)
{
return offset % SIRFSOC_GPIO_BANK_SIZE;
}
static void sirfsoc_gpio_irq_ack(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, d->hwirq);
int idx = sirfsoc_gpio_to_bankoff(d->hwirq);
u32 val, offset;
unsigned long flags;
offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
spin_lock_irqsave(&sgpio->lock, flags);
val = readl(sgpio->chip.regs + offset);
writel(val, sgpio->chip.regs + offset);
spin_unlock_irqrestore(&sgpio->lock, flags);
}
static void __sirfsoc_gpio_irq_mask(struct sirfsoc_gpio_chip *sgpio,
struct sirfsoc_gpio_bank *bank,
int idx)
{
u32 val, offset;
unsigned long flags;
offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
spin_lock_irqsave(&sgpio->lock, flags);
val = readl(sgpio->chip.regs + offset);
val &= ~SIRFSOC_GPIO_CTL_INTR_EN_MASK;
val &= ~SIRFSOC_GPIO_CTL_INTR_STS_MASK;
writel(val, sgpio->chip.regs + offset);
spin_unlock_irqrestore(&sgpio->lock, flags);
}
static void sirfsoc_gpio_irq_mask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, d->hwirq);
__sirfsoc_gpio_irq_mask(sgpio, bank, d->hwirq % SIRFSOC_GPIO_BANK_SIZE);
}
static void sirfsoc_gpio_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, d->hwirq);
int idx = sirfsoc_gpio_to_bankoff(d->hwirq);
u32 val, offset;
unsigned long flags;
offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
spin_lock_irqsave(&sgpio->lock, flags);
val = readl(sgpio->chip.regs + offset);
val &= ~SIRFSOC_GPIO_CTL_INTR_STS_MASK;
val |= SIRFSOC_GPIO_CTL_INTR_EN_MASK;
writel(val, sgpio->chip.regs + offset);
spin_unlock_irqrestore(&sgpio->lock, flags);
}
static int sirfsoc_gpio_irq_type(struct irq_data *d, unsigned type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, d->hwirq);
int idx = sirfsoc_gpio_to_bankoff(d->hwirq);
u32 val, offset;
unsigned long flags;
offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
spin_lock_irqsave(&sgpio->lock, flags);
val = readl(sgpio->chip.regs + offset);
val &= ~(SIRFSOC_GPIO_CTL_INTR_STS_MASK | SIRFSOC_GPIO_CTL_OUT_EN_MASK);
switch (type) {
case IRQ_TYPE_NONE:
break;
case IRQ_TYPE_EDGE_RISING:
val |= SIRFSOC_GPIO_CTL_INTR_HIGH_MASK |
SIRFSOC_GPIO_CTL_INTR_TYPE_MASK;
val &= ~SIRFSOC_GPIO_CTL_INTR_LOW_MASK;
break;
case IRQ_TYPE_EDGE_FALLING:
val &= ~SIRFSOC_GPIO_CTL_INTR_HIGH_MASK;
val |= SIRFSOC_GPIO_CTL_INTR_LOW_MASK |
SIRFSOC_GPIO_CTL_INTR_TYPE_MASK;
break;
case IRQ_TYPE_EDGE_BOTH:
val |= SIRFSOC_GPIO_CTL_INTR_HIGH_MASK |
SIRFSOC_GPIO_CTL_INTR_LOW_MASK |
SIRFSOC_GPIO_CTL_INTR_TYPE_MASK;
break;
case IRQ_TYPE_LEVEL_LOW:
val &= ~(SIRFSOC_GPIO_CTL_INTR_HIGH_MASK |
SIRFSOC_GPIO_CTL_INTR_TYPE_MASK);
val |= SIRFSOC_GPIO_CTL_INTR_LOW_MASK;
break;
case IRQ_TYPE_LEVEL_HIGH:
val |= SIRFSOC_GPIO_CTL_INTR_HIGH_MASK;
val &= ~(SIRFSOC_GPIO_CTL_INTR_LOW_MASK |
SIRFSOC_GPIO_CTL_INTR_TYPE_MASK);
break;
}
writel(val, sgpio->chip.regs + offset);
spin_unlock_irqrestore(&sgpio->lock, flags);
return 0;
}
static struct irq_chip sirfsoc_irq_chip = {
.name = "sirf-gpio-irq",
.irq_ack = sirfsoc_gpio_irq_ack,
.irq_mask = sirfsoc_gpio_irq_mask,
.irq_unmask = sirfsoc_gpio_irq_unmask,
.irq_set_type = sirfsoc_gpio_irq_type,
};
static void sirfsoc_gpio_handle_irq(struct irq_desc *desc)
{
unsigned int irq = irq_desc_get_irq(desc);
struct gpio_chip *gc = irq_desc_get_handler_data(desc);
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
struct sirfsoc_gpio_bank *bank;
u32 status, ctrl;
int idx = 0;
struct irq_chip *chip = irq_desc_get_chip(desc);
int i;
for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
bank = &sgpio->sgpio_bank[i];
if (bank->parent_irq == irq)
break;
}
BUG_ON(i == SIRFSOC_GPIO_NO_OF_BANKS);
chained_irq_enter(chip, desc);
status = readl(sgpio->chip.regs + SIRFSOC_GPIO_INT_STATUS(bank->id));
if (!status) {
printk(KERN_WARNING
"%s: gpio id %d status %#x no interrupt is flagged\n",
__func__, bank->id, status);
handle_bad_irq(desc);
return;
}
while (status) {
ctrl = readl(sgpio->chip.regs + SIRFSOC_GPIO_CTRL(bank->id, idx));
/*
* Here we must check whether the corresponding GPIO's interrupt
* has been enabled, otherwise just skip it
*/
if ((status & 0x1) && (ctrl & SIRFSOC_GPIO_CTL_INTR_EN_MASK)) {
pr_debug("%s: gpio id %d idx %d happens\n",
__func__, bank->id, idx);
generic_handle_irq(irq_find_mapping(gc->irqdomain, idx +
bank->id * SIRFSOC_GPIO_BANK_SIZE));
}
idx++;
status = status >> 1;
}
chained_irq_exit(chip, desc);
}
static inline void sirfsoc_gpio_set_input(struct sirfsoc_gpio_chip *sgpio,
unsigned ctrl_offset)
{
u32 val;
val = readl(sgpio->chip.regs + ctrl_offset);
val &= ~SIRFSOC_GPIO_CTL_OUT_EN_MASK;
writel(val, sgpio->chip.regs + ctrl_offset);
}
static int sirfsoc_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, offset);
unsigned long flags;
if (pinctrl_request_gpio(chip->base + offset))
return -ENODEV;
spin_lock_irqsave(&bank->lock, flags);
/*
* default status:
* set direction as input and mask irq
*/
sirfsoc_gpio_set_input(sgpio, SIRFSOC_GPIO_CTRL(bank->id, offset));
__sirfsoc_gpio_irq_mask(sgpio, bank, offset);
spin_unlock_irqrestore(&bank->lock, flags);
return 0;
}
static void sirfsoc_gpio_free(struct gpio_chip *chip, unsigned offset)
{
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, offset);
unsigned long flags;
spin_lock_irqsave(&bank->lock, flags);
__sirfsoc_gpio_irq_mask(sgpio, bank, offset);
sirfsoc_gpio_set_input(sgpio, SIRFSOC_GPIO_CTRL(bank->id, offset));
spin_unlock_irqrestore(&bank->lock, flags);
pinctrl_free_gpio(chip->base + offset);
}
static int sirfsoc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, gpio);
int idx = sirfsoc_gpio_to_bankoff(gpio);
unsigned long flags;
unsigned offset;
offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
spin_lock_irqsave(&bank->lock, flags);
sirfsoc_gpio_set_input(sgpio, offset);
spin_unlock_irqrestore(&bank->lock, flags);
return 0;
}
static inline void sirfsoc_gpio_set_output(struct sirfsoc_gpio_chip *sgpio,
struct sirfsoc_gpio_bank *bank,
unsigned offset,
int value)
{
u32 out_ctrl;
unsigned long flags;
spin_lock_irqsave(&bank->lock, flags);
out_ctrl = readl(sgpio->chip.regs + offset);
if (value)
out_ctrl |= SIRFSOC_GPIO_CTL_DATAOUT_MASK;
else
out_ctrl &= ~SIRFSOC_GPIO_CTL_DATAOUT_MASK;
out_ctrl &= ~SIRFSOC_GPIO_CTL_INTR_EN_MASK;
out_ctrl |= SIRFSOC_GPIO_CTL_OUT_EN_MASK;
writel(out_ctrl, sgpio->chip.regs + offset);
spin_unlock_irqrestore(&bank->lock, flags);
}
static int sirfsoc_gpio_direction_output(struct gpio_chip *chip,
unsigned gpio, int value)
{
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, gpio);
int idx = sirfsoc_gpio_to_bankoff(gpio);
u32 offset;
unsigned long flags;
offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
spin_lock_irqsave(&sgpio->lock, flags);
sirfsoc_gpio_set_output(sgpio, bank, offset, value);
spin_unlock_irqrestore(&sgpio->lock, flags);
return 0;
}
static int sirfsoc_gpio_get_value(struct gpio_chip *chip, unsigned offset)
{
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, offset);
u32 val;
unsigned long flags;
spin_lock_irqsave(&bank->lock, flags);
val = readl(sgpio->chip.regs + SIRFSOC_GPIO_CTRL(bank->id, offset));
spin_unlock_irqrestore(&bank->lock, flags);
return !!(val & SIRFSOC_GPIO_CTL_DATAIN_MASK);
}
static void sirfsoc_gpio_set_value(struct gpio_chip *chip, unsigned offset,
int value)
{
struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, offset);
u32 ctrl;
unsigned long flags;
spin_lock_irqsave(&bank->lock, flags);
ctrl = readl(sgpio->chip.regs + SIRFSOC_GPIO_CTRL(bank->id, offset));
if (value)
ctrl |= SIRFSOC_GPIO_CTL_DATAOUT_MASK;
else
ctrl &= ~SIRFSOC_GPIO_CTL_DATAOUT_MASK;
writel(ctrl, sgpio->chip.regs + SIRFSOC_GPIO_CTRL(bank->id, offset));
spin_unlock_irqrestore(&bank->lock, flags);
}
static void sirfsoc_gpio_set_pullup(struct sirfsoc_gpio_chip *sgpio,
const u32 *pullups)
{
int i, n;
const unsigned long *p = (const unsigned long *)pullups;
for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
for_each_set_bit(n, p + i, BITS_PER_LONG) {
u32 offset = SIRFSOC_GPIO_CTRL(i, n);
u32 val = readl(sgpio->chip.regs + offset);
val |= SIRFSOC_GPIO_CTL_PULL_MASK;
val |= SIRFSOC_GPIO_CTL_PULL_HIGH;
writel(val, sgpio->chip.regs + offset);
}
}
}
static void sirfsoc_gpio_set_pulldown(struct sirfsoc_gpio_chip *sgpio,
const u32 *pulldowns)
{
int i, n;
const unsigned long *p = (const unsigned long *)pulldowns;
for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
for_each_set_bit(n, p + i, BITS_PER_LONG) {
u32 offset = SIRFSOC_GPIO_CTRL(i, n);
u32 val = readl(sgpio->chip.regs + offset);
val |= SIRFSOC_GPIO_CTL_PULL_MASK;
val &= ~SIRFSOC_GPIO_CTL_PULL_HIGH;
writel(val, sgpio->chip.regs + offset);
}
}
}
static int sirfsoc_gpio_probe(struct device_node *np)
{
int i, err = 0;
static struct sirfsoc_gpio_chip *sgpio;
struct sirfsoc_gpio_bank *bank;
void __iomem *regs;
struct platform_device *pdev;
u32 pullups[SIRFSOC_GPIO_NO_OF_BANKS], pulldowns[SIRFSOC_GPIO_NO_OF_BANKS];
pdev = of_find_device_by_node(np);
if (!pdev)
return -ENODEV;
sgpio = devm_kzalloc(&pdev->dev, sizeof(*sgpio), GFP_KERNEL);
if (!sgpio)
return -ENOMEM;
spin_lock_init(&sgpio->lock);
regs = of_iomap(np, 0);
if (!regs)
return -ENOMEM;
sgpio->chip.gc.request = sirfsoc_gpio_request;
sgpio->chip.gc.free = sirfsoc_gpio_free;
sgpio->chip.gc.direction_input = sirfsoc_gpio_direction_input;
sgpio->chip.gc.get = sirfsoc_gpio_get_value;
sgpio->chip.gc.direction_output = sirfsoc_gpio_direction_output;
sgpio->chip.gc.set = sirfsoc_gpio_set_value;
sgpio->chip.gc.base = 0;
sgpio->chip.gc.ngpio = SIRFSOC_GPIO_BANK_SIZE * SIRFSOC_GPIO_NO_OF_BANKS;
sgpio->chip.gc.label = kstrdup(np->full_name, GFP_KERNEL);
sgpio->chip.gc.of_node = np;
sgpio->chip.gc.of_xlate = sirfsoc_gpio_of_xlate;
sgpio->chip.gc.of_gpio_n_cells = 2;
sgpio->chip.gc.parent = &pdev->dev;
sgpio->chip.regs = regs;
err = gpiochip_add_data(&sgpio->chip.gc, sgpio);
if (err) {
dev_err(&pdev->dev, "%s: error in probe function with status %d\n",
np->full_name, err);
goto out;
}
err = gpiochip_irqchip_add(&sgpio->chip.gc,
&sirfsoc_irq_chip,
0, handle_level_irq,
IRQ_TYPE_NONE);
if (err) {
dev_err(&pdev->dev,
"could not connect irqchip to gpiochip\n");
goto out_banks;
}
for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
bank = &sgpio->sgpio_bank[i];
spin_lock_init(&bank->lock);
bank->parent_irq = platform_get_irq(pdev, i);
if (bank->parent_irq < 0) {
err = bank->parent_irq;
goto out_banks;
}
gpiochip_set_chained_irqchip(&sgpio->chip.gc,
&sirfsoc_irq_chip,
bank->parent_irq,
sirfsoc_gpio_handle_irq);
}
err = gpiochip_add_pin_range(&sgpio->chip.gc, dev_name(&pdev->dev),
0, 0, SIRFSOC_GPIO_BANK_SIZE * SIRFSOC_GPIO_NO_OF_BANKS);
if (err) {
dev_err(&pdev->dev,
"could not add gpiochip pin range\n");
goto out_no_range;
}
if (!of_property_read_u32_array(np, "sirf,pullups", pullups,
SIRFSOC_GPIO_NO_OF_BANKS))
sirfsoc_gpio_set_pullup(sgpio, pullups);
if (!of_property_read_u32_array(np, "sirf,pulldowns", pulldowns,
SIRFSOC_GPIO_NO_OF_BANKS))
sirfsoc_gpio_set_pulldown(sgpio, pulldowns);
return 0;
out_no_range:
out_banks:
gpiochip_remove(&sgpio->chip.gc);
out:
iounmap(regs);
return err;
}
static int __init sirfsoc_gpio_init(void)
{
struct device_node *np;
np = of_find_matching_node(NULL, pinmux_ids);
if (!np)
return -ENODEV;
return sirfsoc_gpio_probe(np);
}
subsys_initcall(sirfsoc_gpio_init);
MODULE_AUTHOR("Rongjun Ying <rongjun.ying@csr.com>");
MODULE_AUTHOR("Yuping Luo <yuping.luo@csr.com>");
MODULE_AUTHOR("Barry Song <baohua.song@csr.com>");
MODULE_DESCRIPTION("SIRFSOC pin control driver");
MODULE_LICENSE("GPL");