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linux/drivers/sh/pfc.c

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/*
* Pinmuxed GPIO support for SuperH.
*
* Copyright (C) 2008 Magnus Damm
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/bitops.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/ioport.h>
static void pfc_iounmap(struct pinmux_info *pip)
{
int k;
for (k = 0; k < pip->num_resources; k++)
if (pip->window[k].virt)
iounmap(pip->window[k].virt);
kfree(pip->window);
pip->window = NULL;
}
static int pfc_ioremap(struct pinmux_info *pip)
{
struct resource *res;
int k;
if (!pip->num_resources)
return 0;
pip->window = kzalloc(pip->num_resources * sizeof(*pip->window),
GFP_NOWAIT);
if (!pip->window)
goto err1;
for (k = 0; k < pip->num_resources; k++) {
res = pip->resource + k;
WARN_ON(resource_type(res) != IORESOURCE_MEM);
pip->window[k].phys = res->start;
pip->window[k].size = resource_size(res);
pip->window[k].virt = ioremap_nocache(res->start,
resource_size(res));
if (!pip->window[k].virt)
goto err2;
}
return 0;
err2:
pfc_iounmap(pip);
err1:
return -1;
}
static void __iomem *pfc_phys_to_virt(struct pinmux_info *pip,
unsigned long address)
{
struct pfc_window *window;
int k;
/* scan through physical windows and convert address */
for (k = 0; k < pip->num_resources; k++) {
window = pip->window + k;
if (address < window->phys)
continue;
if (address >= (window->phys + window->size))
continue;
return window->virt + (address - window->phys);
}
/* no windows defined, register must be 1:1 mapped virt:phys */
return (void __iomem *)address;
}
static int enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r)
{
if (enum_id < r->begin)
return 0;
if (enum_id > r->end)
return 0;
return 1;
}
static unsigned long gpio_read_raw_reg(void __iomem *mapped_reg,
unsigned long reg_width)
{
switch (reg_width) {
case 8:
return ioread8(mapped_reg);
case 16:
return ioread16(mapped_reg);
case 32:
return ioread32(mapped_reg);
}
BUG();
return 0;
}
static void gpio_write_raw_reg(void __iomem *mapped_reg,
unsigned long reg_width,
unsigned long data)
{
switch (reg_width) {
case 8:
iowrite8(data, mapped_reg);
return;
case 16:
iowrite16(data, mapped_reg);
return;
case 32:
iowrite32(data, mapped_reg);
return;
}
BUG();
}
static int gpio_read_bit(struct pinmux_data_reg *dr,
unsigned long in_pos)
{
unsigned long pos;
pos = dr->reg_width - (in_pos + 1);
pr_debug("read_bit: addr = %lx, pos = %ld, "
"r_width = %ld\n", dr->reg, pos, dr->reg_width);
return (gpio_read_raw_reg(dr->mapped_reg, dr->reg_width) >> pos) & 1;
}
static void gpio_write_bit(struct pinmux_data_reg *dr,
unsigned long in_pos, unsigned long value)
{
unsigned long pos;
pos = dr->reg_width - (in_pos + 1);
pr_debug("write_bit addr = %lx, value = %d, pos = %ld, "
"r_width = %ld\n",
dr->reg, !!value, pos, dr->reg_width);
if (value)
set_bit(pos, &dr->reg_shadow);
else
clear_bit(pos, &dr->reg_shadow);
gpio_write_raw_reg(dr->mapped_reg, dr->reg_width, dr->reg_shadow);
}
static void config_reg_helper(struct pinmux_info *gpioc,
struct pinmux_cfg_reg *crp,
unsigned long in_pos,
void __iomem **mapped_regp,
unsigned long *maskp,
unsigned long *posp)
{
int k;
*mapped_regp = pfc_phys_to_virt(gpioc, crp->reg);
if (crp->field_width) {
*maskp = (1 << crp->field_width) - 1;
*posp = crp->reg_width - ((in_pos + 1) * crp->field_width);
} else {
*maskp = (1 << crp->var_field_width[in_pos]) - 1;
*posp = crp->reg_width;
for (k = 0; k <= in_pos; k++)
*posp -= crp->var_field_width[k];
}
}
static int read_config_reg(struct pinmux_info *gpioc,
struct pinmux_cfg_reg *crp,
unsigned long field)
{
void __iomem *mapped_reg;
unsigned long mask, pos;
config_reg_helper(gpioc, crp, field, &mapped_reg, &mask, &pos);
pr_debug("read_reg: addr = %lx, field = %ld, "
"r_width = %ld, f_width = %ld\n",
crp->reg, field, crp->reg_width, crp->field_width);
return (gpio_read_raw_reg(mapped_reg, crp->reg_width) >> pos) & mask;
}
static void write_config_reg(struct pinmux_info *gpioc,
struct pinmux_cfg_reg *crp,
unsigned long field, unsigned long value)
{
void __iomem *mapped_reg;
unsigned long mask, pos, data;
config_reg_helper(gpioc, crp, field, &mapped_reg, &mask, &pos);
pr_debug("write_reg addr = %lx, value = %ld, field = %ld, "
"r_width = %ld, f_width = %ld\n",
crp->reg, value, field, crp->reg_width, crp->field_width);
mask = ~(mask << pos);
value = value << pos;
data = gpio_read_raw_reg(mapped_reg, crp->reg_width);
data &= mask;
data |= value;
if (gpioc->unlock_reg)
gpio_write_raw_reg(pfc_phys_to_virt(gpioc, gpioc->unlock_reg),
32, ~data);
gpio_write_raw_reg(mapped_reg, crp->reg_width, data);
}
static int setup_data_reg(struct pinmux_info *gpioc, unsigned gpio)
{
struct pinmux_gpio *gpiop = &gpioc->gpios[gpio];
struct pinmux_data_reg *data_reg;
int k, n;
if (!enum_in_range(gpiop->enum_id, &gpioc->data))
return -1;
k = 0;
while (1) {
data_reg = gpioc->data_regs + k;
if (!data_reg->reg_width)
break;
data_reg->mapped_reg = pfc_phys_to_virt(gpioc, data_reg->reg);
for (n = 0; n < data_reg->reg_width; n++) {
if (data_reg->enum_ids[n] == gpiop->enum_id) {
gpiop->flags &= ~PINMUX_FLAG_DREG;
gpiop->flags |= (k << PINMUX_FLAG_DREG_SHIFT);
gpiop->flags &= ~PINMUX_FLAG_DBIT;
gpiop->flags |= (n << PINMUX_FLAG_DBIT_SHIFT);
return 0;
}
}
k++;
}
BUG();
return -1;
}
static void setup_data_regs(struct pinmux_info *gpioc)
{
struct pinmux_data_reg *drp;
int k;
for (k = gpioc->first_gpio; k <= gpioc->last_gpio; k++)
setup_data_reg(gpioc, k);
k = 0;
while (1) {
drp = gpioc->data_regs + k;
if (!drp->reg_width)
break;
drp->reg_shadow = gpio_read_raw_reg(drp->mapped_reg,
drp->reg_width);
k++;
}
}
static int get_data_reg(struct pinmux_info *gpioc, unsigned gpio,
struct pinmux_data_reg **drp, int *bitp)
{
struct pinmux_gpio *gpiop = &gpioc->gpios[gpio];
int k, n;
if (!enum_in_range(gpiop->enum_id, &gpioc->data))
return -1;
k = (gpiop->flags & PINMUX_FLAG_DREG) >> PINMUX_FLAG_DREG_SHIFT;
n = (gpiop->flags & PINMUX_FLAG_DBIT) >> PINMUX_FLAG_DBIT_SHIFT;
*drp = gpioc->data_regs + k;
*bitp = n;
return 0;
}
static int get_config_reg(struct pinmux_info *gpioc, pinmux_enum_t enum_id,
struct pinmux_cfg_reg **crp,
int *fieldp, int *valuep,
unsigned long **cntp)
{
struct pinmux_cfg_reg *config_reg;
unsigned long r_width, f_width, curr_width, ncomb;
int k, m, n, pos, bit_pos;
k = 0;
while (1) {
config_reg = gpioc->cfg_regs + k;
r_width = config_reg->reg_width;
f_width = config_reg->field_width;
if (!r_width)
break;
pos = 0;
m = 0;
for (bit_pos = 0; bit_pos < r_width; bit_pos += curr_width) {
if (f_width)
curr_width = f_width;
else
curr_width = config_reg->var_field_width[m];
ncomb = 1 << curr_width;
for (n = 0; n < ncomb; n++) {
if (config_reg->enum_ids[pos + n] == enum_id) {
*crp = config_reg;
*fieldp = m;
*valuep = n;
*cntp = &config_reg->cnt[m];
return 0;
}
}
pos += ncomb;
m++;
}
k++;
}
return -1;
}
static int get_gpio_enum_id(struct pinmux_info *gpioc, unsigned gpio,
int pos, pinmux_enum_t *enum_idp)
{
pinmux_enum_t enum_id = gpioc->gpios[gpio].enum_id;
pinmux_enum_t *data = gpioc->gpio_data;
int k;
if (!enum_in_range(enum_id, &gpioc->data)) {
if (!enum_in_range(enum_id, &gpioc->mark)) {
pr_err("non data/mark enum_id for gpio %d\n", gpio);
return -1;
}
}
if (pos) {
*enum_idp = data[pos + 1];
return pos + 1;
}
for (k = 0; k < gpioc->gpio_data_size; k++) {
if (data[k] == enum_id) {
*enum_idp = data[k + 1];
return k + 1;
}
}
pr_err("cannot locate data/mark enum_id for gpio %d\n", gpio);
return -1;
}
enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE };
static int pinmux_config_gpio(struct pinmux_info *gpioc, unsigned gpio,
int pinmux_type, int cfg_mode)
{
struct pinmux_cfg_reg *cr = NULL;
pinmux_enum_t enum_id;
struct pinmux_range *range;
int in_range, pos, field, value;
unsigned long *cntp;
switch (pinmux_type) {
case PINMUX_TYPE_FUNCTION:
range = NULL;
break;
case PINMUX_TYPE_OUTPUT:
range = &gpioc->output;
break;
case PINMUX_TYPE_INPUT:
range = &gpioc->input;
break;
case PINMUX_TYPE_INPUT_PULLUP:
range = &gpioc->input_pu;
break;
case PINMUX_TYPE_INPUT_PULLDOWN:
range = &gpioc->input_pd;
break;
default:
goto out_err;
}
pos = 0;
enum_id = 0;
field = 0;
value = 0;
while (1) {
pos = get_gpio_enum_id(gpioc, gpio, pos, &enum_id);
if (pos <= 0)
goto out_err;
if (!enum_id)
break;
/* first check if this is a function enum */
in_range = enum_in_range(enum_id, &gpioc->function);
if (!in_range) {
/* not a function enum */
if (range) {
/*
* other range exists, so this pin is
* a regular GPIO pin that now is being
* bound to a specific direction.
*
* for this case we only allow function enums
* and the enums that match the other range.
*/
in_range = enum_in_range(enum_id, range);
/*
* special case pass through for fixed
* input-only or output-only pins without
* function enum register association.
*/
if (in_range && enum_id == range->force)
continue;
} else {
/*
* no other range exists, so this pin
* must then be of the function type.
*
* allow function type pins to select
* any combination of function/in/out
* in their MARK lists.
*/
in_range = 1;
}
}
if (!in_range)
continue;
if (get_config_reg(gpioc, enum_id, &cr,
&field, &value, &cntp) != 0)
goto out_err;
switch (cfg_mode) {
case GPIO_CFG_DRYRUN:
if (!*cntp ||
(read_config_reg(gpioc, cr, field) != value))
continue;
break;
case GPIO_CFG_REQ:
write_config_reg(gpioc, cr, field, value);
*cntp = *cntp + 1;
break;
case GPIO_CFG_FREE:
*cntp = *cntp - 1;
break;
}
}
return 0;
out_err:
return -1;
}
static DEFINE_SPINLOCK(gpio_lock);
static struct pinmux_info *chip_to_pinmux(struct gpio_chip *chip)
{
return container_of(chip, struct pinmux_info, chip);
}
static int sh_gpio_request(struct gpio_chip *chip, unsigned offset)
{
struct pinmux_info *gpioc = chip_to_pinmux(chip);
struct pinmux_data_reg *dummy;
unsigned long flags;
int i, ret, pinmux_type;
ret = -EINVAL;
if (!gpioc)
goto err_out;
spin_lock_irqsave(&gpio_lock, flags);
if ((gpioc->gpios[offset].flags & PINMUX_FLAG_TYPE) != PINMUX_TYPE_NONE)
goto err_unlock;
/* setup pin function here if no data is associated with pin */
if (get_data_reg(gpioc, offset, &dummy, &i) != 0)
pinmux_type = PINMUX_TYPE_FUNCTION;
else
pinmux_type = PINMUX_TYPE_GPIO;
if (pinmux_type == PINMUX_TYPE_FUNCTION) {
if (pinmux_config_gpio(gpioc, offset,
pinmux_type,
GPIO_CFG_DRYRUN) != 0)
goto err_unlock;
if (pinmux_config_gpio(gpioc, offset,
pinmux_type,
GPIO_CFG_REQ) != 0)
BUG();
}
gpioc->gpios[offset].flags &= ~PINMUX_FLAG_TYPE;
gpioc->gpios[offset].flags |= pinmux_type;
ret = 0;
err_unlock:
spin_unlock_irqrestore(&gpio_lock, flags);
err_out:
return ret;
}
static void sh_gpio_free(struct gpio_chip *chip, unsigned offset)
{
struct pinmux_info *gpioc = chip_to_pinmux(chip);
unsigned long flags;
int pinmux_type;
if (!gpioc)
return;
spin_lock_irqsave(&gpio_lock, flags);
pinmux_type = gpioc->gpios[offset].flags & PINMUX_FLAG_TYPE;
pinmux_config_gpio(gpioc, offset, pinmux_type, GPIO_CFG_FREE);
gpioc->gpios[offset].flags &= ~PINMUX_FLAG_TYPE;
gpioc->gpios[offset].flags |= PINMUX_TYPE_NONE;
spin_unlock_irqrestore(&gpio_lock, flags);
}
static int pinmux_direction(struct pinmux_info *gpioc,
unsigned gpio, int new_pinmux_type)
{
int pinmux_type;
int ret = -EINVAL;
if (!gpioc)
goto err_out;
pinmux_type = gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE;
switch (pinmux_type) {
case PINMUX_TYPE_GPIO:
break;
case PINMUX_TYPE_OUTPUT:
case PINMUX_TYPE_INPUT:
case PINMUX_TYPE_INPUT_PULLUP:
case PINMUX_TYPE_INPUT_PULLDOWN:
pinmux_config_gpio(gpioc, gpio, pinmux_type, GPIO_CFG_FREE);
break;
default:
goto err_out;
}
if (pinmux_config_gpio(gpioc, gpio,
new_pinmux_type,
GPIO_CFG_DRYRUN) != 0)
goto err_out;
if (pinmux_config_gpio(gpioc, gpio,
new_pinmux_type,
GPIO_CFG_REQ) != 0)
BUG();
gpioc->gpios[gpio].flags &= ~PINMUX_FLAG_TYPE;
gpioc->gpios[gpio].flags |= new_pinmux_type;
ret = 0;
err_out:
return ret;
}
static int sh_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct pinmux_info *gpioc = chip_to_pinmux(chip);
unsigned long flags;
int ret;
spin_lock_irqsave(&gpio_lock, flags);
ret = pinmux_direction(gpioc, offset, PINMUX_TYPE_INPUT);
spin_unlock_irqrestore(&gpio_lock, flags);
return ret;
}
static void sh_gpio_set_value(struct pinmux_info *gpioc,
unsigned gpio, int value)
{
struct pinmux_data_reg *dr = NULL;
int bit = 0;
if (!gpioc || get_data_reg(gpioc, gpio, &dr, &bit) != 0)
BUG();
else
gpio_write_bit(dr, bit, value);
}
static int sh_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
struct pinmux_info *gpioc = chip_to_pinmux(chip);
unsigned long flags;
int ret;
sh_gpio_set_value(gpioc, offset, value);
spin_lock_irqsave(&gpio_lock, flags);
ret = pinmux_direction(gpioc, offset, PINMUX_TYPE_OUTPUT);
spin_unlock_irqrestore(&gpio_lock, flags);
return ret;
}
static int sh_gpio_get_value(struct pinmux_info *gpioc, unsigned gpio)
{
struct pinmux_data_reg *dr = NULL;
int bit = 0;
if (!gpioc || get_data_reg(gpioc, gpio, &dr, &bit) != 0)
return -EINVAL;
return gpio_read_bit(dr, bit);
}
static int sh_gpio_get(struct gpio_chip *chip, unsigned offset)
{
return sh_gpio_get_value(chip_to_pinmux(chip), offset);
}
static void sh_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
sh_gpio_set_value(chip_to_pinmux(chip), offset, value);
}
static int sh_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct pinmux_info *gpioc = chip_to_pinmux(chip);
pinmux_enum_t enum_id;
pinmux_enum_t *enum_ids;
int i, k, pos;
pos = 0;
enum_id = 0;
while (1) {
pos = get_gpio_enum_id(gpioc, offset, pos, &enum_id);
if (pos <= 0 || !enum_id)
break;
for (i = 0; i < gpioc->gpio_irq_size; i++) {
enum_ids = gpioc->gpio_irq[i].enum_ids;
for (k = 0; enum_ids[k]; k++) {
if (enum_ids[k] == enum_id)
return gpioc->gpio_irq[i].irq;
}
}
}
return -ENOSYS;
}
int register_pinmux(struct pinmux_info *pip)
{
struct gpio_chip *chip = &pip->chip;
int ret;
pr_info("%s handling gpio %d -> %d\n",
pip->name, pip->first_gpio, pip->last_gpio);
ret = pfc_ioremap(pip);
if (ret < 0)
return ret;
setup_data_regs(pip);
chip->request = sh_gpio_request;
chip->free = sh_gpio_free;
chip->direction_input = sh_gpio_direction_input;
chip->get = sh_gpio_get;
chip->direction_output = sh_gpio_direction_output;
chip->set = sh_gpio_set;
chip->to_irq = sh_gpio_to_irq;
WARN_ON(pip->first_gpio != 0); /* needs testing */
chip->label = pip->name;
chip->owner = THIS_MODULE;
chip->base = pip->first_gpio;
chip->ngpio = (pip->last_gpio - pip->first_gpio) + 1;
ret = gpiochip_add(chip);
if (ret < 0)
pfc_iounmap(pip);
return ret;
}
int unregister_pinmux(struct pinmux_info *pip)
{
pr_info("%s deregistering\n", pip->name);
pfc_iounmap(pip);
return gpiochip_remove(&pip->chip);
}