satip-axe/kernel/arch/arm/plat-stmp3xxx/pinmux.c

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/*
* Freescale STMP378X/STMP378X Pin Multiplexing
*
* Author: Vladislav Buzov <vbuzov@embeddedalley.com>
*
* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#define DEBUG
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/sysdev.h>
#include <linux/string.h>
#include <linux/bitops.h>
#include <linux/irq.h>
#include <mach/hardware.h>
#include <mach/platform.h>
#include <mach/regs-pinctrl.h>
#include <mach/pins.h>
#include <mach/pinmux.h>
#define NR_BANKS ARRAY_SIZE(pinmux_banks)
static struct stmp3xxx_pinmux_bank pinmux_banks[] = {
[0] = {
.hw_muxsel = {
REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL0,
REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL1,
},
.hw_drive = {
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE0,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE1,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE2,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE3,
},
.hw_pull = REGS_PINCTRL_BASE + HW_PINCTRL_PULL0,
.functions = { 0x0, 0x1, 0x2, 0x3 },
.strengths = { 0x0, 0x1, 0x2, 0x3, 0xff },
.hw_gpio_in = REGS_PINCTRL_BASE + HW_PINCTRL_DIN0,
.hw_gpio_out = REGS_PINCTRL_BASE + HW_PINCTRL_DOUT0,
.hw_gpio_doe = REGS_PINCTRL_BASE + HW_PINCTRL_DOE0,
.irq = IRQ_GPIO0,
.pin2irq = REGS_PINCTRL_BASE + HW_PINCTRL_PIN2IRQ0,
.irqstat = REGS_PINCTRL_BASE + HW_PINCTRL_IRQSTAT0,
.irqlevel = REGS_PINCTRL_BASE + HW_PINCTRL_IRQLEVEL0,
.irqpolarity = REGS_PINCTRL_BASE + HW_PINCTRL_IRQPOL0,
.irqen = REGS_PINCTRL_BASE + HW_PINCTRL_IRQEN0,
},
[1] = {
.hw_muxsel = {
REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL2,
REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL3,
},
.hw_drive = {
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE4,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE5,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE6,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE7,
},
.hw_pull = REGS_PINCTRL_BASE + HW_PINCTRL_PULL1,
.functions = { 0x0, 0x1, 0x2, 0x3 },
.strengths = { 0x0, 0x1, 0x2, 0x3, 0xff },
.hw_gpio_in = REGS_PINCTRL_BASE + HW_PINCTRL_DIN1,
.hw_gpio_out = REGS_PINCTRL_BASE + HW_PINCTRL_DOUT1,
.hw_gpio_doe = REGS_PINCTRL_BASE + HW_PINCTRL_DOE1,
.irq = IRQ_GPIO1,
.pin2irq = REGS_PINCTRL_BASE + HW_PINCTRL_PIN2IRQ1,
.irqstat = REGS_PINCTRL_BASE + HW_PINCTRL_IRQSTAT1,
.irqlevel = REGS_PINCTRL_BASE + HW_PINCTRL_IRQLEVEL1,
.irqpolarity = REGS_PINCTRL_BASE + HW_PINCTRL_IRQPOL1,
.irqen = REGS_PINCTRL_BASE + HW_PINCTRL_IRQEN1,
},
[2] = {
.hw_muxsel = {
REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL4,
REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL5,
},
.hw_drive = {
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE8,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE9,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE10,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE11,
},
.hw_pull = REGS_PINCTRL_BASE + HW_PINCTRL_PULL2,
.functions = { 0x0, 0x1, 0x2, 0x3 },
.strengths = { 0x0, 0x1, 0x2, 0x1, 0x2 },
.hw_gpio_in = REGS_PINCTRL_BASE + HW_PINCTRL_DIN2,
.hw_gpio_out = REGS_PINCTRL_BASE + HW_PINCTRL_DOUT2,
.hw_gpio_doe = REGS_PINCTRL_BASE + HW_PINCTRL_DOE2,
.irq = IRQ_GPIO2,
.pin2irq = REGS_PINCTRL_BASE + HW_PINCTRL_PIN2IRQ2,
.irqstat = REGS_PINCTRL_BASE + HW_PINCTRL_IRQSTAT2,
.irqlevel = REGS_PINCTRL_BASE + HW_PINCTRL_IRQLEVEL2,
.irqpolarity = REGS_PINCTRL_BASE + HW_PINCTRL_IRQPOL2,
.irqen = REGS_PINCTRL_BASE + HW_PINCTRL_IRQEN2,
},
[3] = {
.hw_muxsel = {
REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL6,
REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL7,
},
.hw_drive = {
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE12,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE13,
REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE14,
NULL,
},
.hw_pull = REGS_PINCTRL_BASE + HW_PINCTRL_PULL3,
.functions = {0x0, 0x1, 0x2, 0x3},
.strengths = {0x0, 0x1, 0x2, 0x3, 0xff},
},
};
static inline struct stmp3xxx_pinmux_bank *
stmp3xxx_pinmux_bank(unsigned id, unsigned *bank, unsigned *pin)
{
unsigned b, p;
b = STMP3XXX_PINID_TO_BANK(id);
p = STMP3XXX_PINID_TO_PINNUM(id);
BUG_ON(b >= NR_BANKS);
if (bank)
*bank = b;
if (pin)
*pin = p;
return &pinmux_banks[b];
}
/* Check if requested pin is owned by caller */
static int stmp3xxx_check_pin(unsigned id, const char *label)
{
unsigned pin;
struct stmp3xxx_pinmux_bank *pm = stmp3xxx_pinmux_bank(id, NULL, &pin);
if (!test_bit(pin, &pm->pin_map)) {
printk(KERN_WARNING
"%s: Accessing free pin %x, caller %s\n",
__func__, id, label);
return -EINVAL;
}
if (label && pm->pin_labels[pin] &&
strcmp(label, pm->pin_labels[pin])) {
printk(KERN_WARNING
"%s: Wrong pin owner %x, caller %s owner %s\n",
__func__, id, label, pm->pin_labels[pin]);
return -EINVAL;
}
return 0;
}
void stmp3xxx_pin_strength(unsigned id, enum pin_strength strength,
const char *label)
{
struct stmp3xxx_pinmux_bank *pbank;
void __iomem *hwdrive;
u32 shift, val;
u32 bank, pin;
pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
pr_debug("%s: label %s bank %d pin %d strength %d\n", __func__, label,
bank, pin, strength);
hwdrive = pbank->hw_drive[pin / HW_DRIVE_PIN_NUM];
shift = (pin % HW_DRIVE_PIN_NUM) * HW_DRIVE_PIN_LEN;
val = pbank->strengths[strength];
if (val == 0xff) {
printk(KERN_WARNING
"%s: strength is not supported for bank %d, caller %s",
__func__, bank, label);
return;
}
if (stmp3xxx_check_pin(id, label))
return;
pr_debug("%s: writing 0x%x to 0x%p register\n", __func__,
val << shift, hwdrive);
stmp3xxx_clearl(HW_DRIVE_PINDRV_MASK << shift, hwdrive);
stmp3xxx_setl(val << shift, hwdrive);
}
void stmp3xxx_pin_voltage(unsigned id, enum pin_voltage voltage,
const char *label)
{
struct stmp3xxx_pinmux_bank *pbank;
void __iomem *hwdrive;
u32 shift;
u32 bank, pin;
pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
pr_debug("%s: label %s bank %d pin %d voltage %d\n", __func__, label,
bank, pin, voltage);
hwdrive = pbank->hw_drive[pin / HW_DRIVE_PIN_NUM];
shift = (pin % HW_DRIVE_PIN_NUM) * HW_DRIVE_PIN_LEN;
if (stmp3xxx_check_pin(id, label))
return;
pr_debug("%s: changing 0x%x bit in 0x%p register\n",
__func__, HW_DRIVE_PINV_MASK << shift, hwdrive);
if (voltage == PIN_1_8V)
stmp3xxx_clearl(HW_DRIVE_PINV_MASK << shift, hwdrive);
else
stmp3xxx_setl(HW_DRIVE_PINV_MASK << shift, hwdrive);
}
void stmp3xxx_pin_pullup(unsigned id, int enable, const char *label)
{
struct stmp3xxx_pinmux_bank *pbank;
void __iomem *hwpull;
u32 bank, pin;
pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
pr_debug("%s: label %s bank %d pin %d enable %d\n", __func__, label,
bank, pin, enable);
hwpull = pbank->hw_pull;
if (stmp3xxx_check_pin(id, label))
return;
pr_debug("%s: changing 0x%x bit in 0x%p register\n",
__func__, 1 << pin, hwpull);
if (enable)
stmp3xxx_setl(1 << pin, hwpull);
else
stmp3xxx_clearl(1 << pin, hwpull);
}
int stmp3xxx_request_pin(unsigned id, enum pin_fun fun, const char *label)
{
struct stmp3xxx_pinmux_bank *pbank;
u32 bank, pin;
int ret = 0;
pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
pr_debug("%s: label %s bank %d pin %d fun %d\n", __func__, label,
bank, pin, fun);
if (test_bit(pin, &pbank->pin_map)) {
printk(KERN_WARNING
"%s: CONFLICT DETECTED pin %d:%d caller %s owner %s\n",
__func__, bank, pin, label, pbank->pin_labels[pin]);
return -EBUSY;
}
set_bit(pin, &pbank->pin_map);
pbank->pin_labels[pin] = label;
stmp3xxx_set_pin_type(id, fun);
return ret;
}
void stmp3xxx_set_pin_type(unsigned id, enum pin_fun fun)
{
struct stmp3xxx_pinmux_bank *pbank;
void __iomem *hwmux;
u32 shift, val;
u32 bank, pin;
pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
hwmux = pbank->hw_muxsel[pin / HW_MUXSEL_PIN_NUM];
shift = (pin % HW_MUXSEL_PIN_NUM) * HW_MUXSEL_PIN_LEN;
val = pbank->functions[fun];
shift = (pin % HW_MUXSEL_PIN_NUM) * HW_MUXSEL_PIN_LEN;
pr_debug("%s: writing 0x%x to 0x%p register\n",
__func__, val << shift, hwmux);
stmp3xxx_clearl(HW_MUXSEL_PINFUN_MASK << shift, hwmux);
stmp3xxx_setl(val << shift, hwmux);
}
void stmp3xxx_release_pin(unsigned id, const char *label)
{
struct stmp3xxx_pinmux_bank *pbank;
u32 bank, pin;
pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
pr_debug("%s: label %s bank %d pin %d\n", __func__, label, bank, pin);
if (stmp3xxx_check_pin(id, label))
return;
clear_bit(pin, &pbank->pin_map);
pbank->pin_labels[pin] = NULL;
}
int stmp3xxx_request_pin_group(struct pin_group *pin_group, const char *label)
{
struct pin_desc *pin;
int p;
int err = 0;
/* Allocate and configure pins */
for (p = 0; p < pin_group->nr_pins; p++) {
pr_debug("%s: #%d\n", __func__, p);
pin = &pin_group->pins[p];
err = stmp3xxx_request_pin(pin->id, pin->fun, label);
if (err)
goto out_err;
stmp3xxx_pin_strength(pin->id, pin->strength, label);
stmp3xxx_pin_voltage(pin->id, pin->voltage, label);
stmp3xxx_pin_pullup(pin->id, pin->pullup, label);
}
return 0;
out_err:
/* Release allocated pins in case of error */
while (--p >= 0) {
pr_debug("%s: releasing #%d\n", __func__, p);
stmp3xxx_release_pin(pin_group->pins[p].id, label);
}
return err;
}
EXPORT_SYMBOL(stmp3xxx_request_pin_group);
void stmp3xxx_release_pin_group(struct pin_group *pin_group, const char *label)
{
struct pin_desc *pin;
int p;
for (p = 0; p < pin_group->nr_pins; p++) {
pin = &pin_group->pins[p];
stmp3xxx_release_pin(pin->id, label);
}
}
EXPORT_SYMBOL(stmp3xxx_release_pin_group);
static int stmp3xxx_irq_to_gpio(int irq,
struct stmp3xxx_pinmux_bank **bank, unsigned *gpio)
{
struct stmp3xxx_pinmux_bank *pm;
for (pm = pinmux_banks; pm < pinmux_banks + NR_BANKS; pm++)
if (pm->virq <= irq && irq < pm->virq + 32) {
*bank = pm;
*gpio = irq - pm->virq;
return 0;
}
return -ENOENT;
}
static int stmp3xxx_set_irqtype(unsigned irq, unsigned type)
{
struct stmp3xxx_pinmux_bank *pm;
unsigned gpio;
int l, p;
stmp3xxx_irq_to_gpio(irq, &pm, &gpio);
switch (type) {
case IRQ_TYPE_EDGE_RISING:
l = 0; p = 1; break;
case IRQ_TYPE_EDGE_FALLING:
l = 0; p = 0; break;
case IRQ_TYPE_LEVEL_HIGH:
l = 1; p = 1; break;
case IRQ_TYPE_LEVEL_LOW:
l = 1; p = 0; break;
default:
pr_debug("%s: Incorrect GPIO interrupt type 0x%x\n",
__func__, type);
return -ENXIO;
}
if (l)
stmp3xxx_setl(1 << gpio, pm->irqlevel);
else
stmp3xxx_clearl(1 << gpio, pm->irqlevel);
if (p)
stmp3xxx_setl(1 << gpio, pm->irqpolarity);
else
stmp3xxx_clearl(1 << gpio, pm->irqpolarity);
return 0;
}
static void stmp3xxx_pin_ack_irq(unsigned irq)
{
u32 stat;
struct stmp3xxx_pinmux_bank *pm;
unsigned gpio;
stmp3xxx_irq_to_gpio(irq, &pm, &gpio);
stat = __raw_readl(pm->irqstat) & (1 << gpio);
stmp3xxx_clearl(stat, pm->irqstat);
}
static void stmp3xxx_pin_mask_irq(unsigned irq)
{
struct stmp3xxx_pinmux_bank *pm;
unsigned gpio;
stmp3xxx_irq_to_gpio(irq, &pm, &gpio);
stmp3xxx_clearl(1 << gpio, pm->irqen);
stmp3xxx_clearl(1 << gpio, pm->pin2irq);
}
static void stmp3xxx_pin_unmask_irq(unsigned irq)
{
struct stmp3xxx_pinmux_bank *pm;
unsigned gpio;
stmp3xxx_irq_to_gpio(irq, &pm, &gpio);
stmp3xxx_setl(1 << gpio, pm->irqen);
stmp3xxx_setl(1 << gpio, pm->pin2irq);
}
static inline
struct stmp3xxx_pinmux_bank *to_pinmux_bank(struct gpio_chip *chip)
{
return container_of(chip, struct stmp3xxx_pinmux_bank, chip);
}
static int stmp3xxx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
return pm->virq + offset;
}
static int stmp3xxx_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
unsigned v;
v = __raw_readl(pm->hw_gpio_in) & (1 << offset);
return v ? 1 : 0;
}
static void stmp3xxx_gpio_set(struct gpio_chip *chip, unsigned offset, int v)
{
struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
if (v)
stmp3xxx_setl(1 << offset, pm->hw_gpio_out);
else
stmp3xxx_clearl(1 << offset, pm->hw_gpio_out);
}
static int stmp3xxx_gpio_output(struct gpio_chip *chip, unsigned offset, int v)
{
struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
stmp3xxx_setl(1 << offset, pm->hw_gpio_doe);
stmp3xxx_gpio_set(chip, offset, v);
return 0;
}
static int stmp3xxx_gpio_input(struct gpio_chip *chip, unsigned offset)
{
struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
stmp3xxx_clearl(1 << offset, pm->hw_gpio_doe);
return 0;
}
static int stmp3xxx_gpio_request(struct gpio_chip *chip, unsigned offset)
{
return stmp3xxx_request_pin(chip->base + offset, PIN_GPIO, "gpio");
}
static void stmp3xxx_gpio_free(struct gpio_chip *chip, unsigned offset)
{
stmp3xxx_release_pin(chip->base + offset, "gpio");
}
static void stmp3xxx_gpio_irq(u32 irq, struct irq_desc *desc)
{
struct stmp3xxx_pinmux_bank *pm = get_irq_data(irq);
int gpio_irq = pm->virq;
u32 stat = __raw_readl(pm->irqstat);
while (stat) {
if (stat & 1)
irq_desc[gpio_irq].handle_irq(gpio_irq,
&irq_desc[gpio_irq]);
gpio_irq++;
stat >>= 1;
}
}
static struct irq_chip gpio_irq_chip = {
.ack = stmp3xxx_pin_ack_irq,
.mask = stmp3xxx_pin_mask_irq,
.unmask = stmp3xxx_pin_unmask_irq,
.set_type = stmp3xxx_set_irqtype,
};
int __init stmp3xxx_pinmux_init(int virtual_irq_start)
{
int b, r = 0;
struct stmp3xxx_pinmux_bank *pm;
int virq;
for (b = 0; b < 3; b++) {
/* only banks 0,1,2 are allowed to GPIO */
pm = pinmux_banks + b;
pm->chip.base = 32 * b;
pm->chip.ngpio = 32;
pm->chip.owner = THIS_MODULE;
pm->chip.can_sleep = 1;
pm->chip.exported = 1;
pm->chip.to_irq = stmp3xxx_gpio_to_irq;
pm->chip.direction_input = stmp3xxx_gpio_input;
pm->chip.direction_output = stmp3xxx_gpio_output;
pm->chip.get = stmp3xxx_gpio_get;
pm->chip.set = stmp3xxx_gpio_set;
pm->chip.request = stmp3xxx_gpio_request;
pm->chip.free = stmp3xxx_gpio_free;
pm->virq = virtual_irq_start + b * 32;
for (virq = pm->virq; virq < pm->virq; virq++) {
gpio_irq_chip.mask(virq);
set_irq_chip(virq, &gpio_irq_chip);
set_irq_handler(virq, handle_level_irq);
set_irq_flags(virq, IRQF_VALID);
}
r = gpiochip_add(&pm->chip);
if (r < 0)
break;
set_irq_chained_handler(pm->irq, stmp3xxx_gpio_irq);
set_irq_data(pm->irq, pm);
}
return r;
}
MODULE_AUTHOR("Vladislav Buzov");
MODULE_LICENSE("GPL");