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WSL2-Linux-Kernel/arch/blackfin/kernel/bfin_gpio.c

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30 KiB
C
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/*
* GPIO Abstraction Layer
*
* Copyright 2006-2009 Analog Devices Inc.
*
* Licensed under the GPL-2 or later
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/proc_fs.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
#include <asm/portmux.h>
#include <linux/irq.h>
#if ANOMALY_05000311 || ANOMALY_05000323
enum {
AWA_data = SYSCR,
AWA_data_clear = SYSCR,
AWA_data_set = SYSCR,
AWA_toggle = SYSCR,
AWA_maska = BFIN_UART_SCR,
AWA_maska_clear = BFIN_UART_SCR,
AWA_maska_set = BFIN_UART_SCR,
AWA_maska_toggle = BFIN_UART_SCR,
AWA_maskb = BFIN_UART_GCTL,
AWA_maskb_clear = BFIN_UART_GCTL,
AWA_maskb_set = BFIN_UART_GCTL,
AWA_maskb_toggle = BFIN_UART_GCTL,
AWA_dir = SPORT1_STAT,
AWA_polar = SPORT1_STAT,
AWA_edge = SPORT1_STAT,
AWA_both = SPORT1_STAT,
#if ANOMALY_05000311
AWA_inen = TIMER_ENABLE,
#elif ANOMALY_05000323
AWA_inen = DMA1_1_CONFIG,
#endif
};
/* Anomaly Workaround */
#define AWA_DUMMY_READ(name) bfin_read16(AWA_ ## name)
#else
#define AWA_DUMMY_READ(...) do { } while (0)
#endif
static struct gpio_port_t * const gpio_array[] = {
#if defined(BF533_FAMILY) || defined(BF538_FAMILY)
(struct gpio_port_t *) FIO_FLAG_D,
#elif defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
(struct gpio_port_t *) PORTFIO,
(struct gpio_port_t *) PORTGIO,
(struct gpio_port_t *) PORTHIO,
#elif defined(BF561_FAMILY)
(struct gpio_port_t *) FIO0_FLAG_D,
(struct gpio_port_t *) FIO1_FLAG_D,
(struct gpio_port_t *) FIO2_FLAG_D,
#elif defined(CONFIG_BF54x)
(struct gpio_port_t *)PORTA_FER,
(struct gpio_port_t *)PORTB_FER,
(struct gpio_port_t *)PORTC_FER,
(struct gpio_port_t *)PORTD_FER,
(struct gpio_port_t *)PORTE_FER,
(struct gpio_port_t *)PORTF_FER,
(struct gpio_port_t *)PORTG_FER,
(struct gpio_port_t *)PORTH_FER,
(struct gpio_port_t *)PORTI_FER,
(struct gpio_port_t *)PORTJ_FER,
#else
# error no gpio arrays defined
#endif
};
#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
static unsigned short * const port_fer[] = {
(unsigned short *) PORTF_FER,
(unsigned short *) PORTG_FER,
(unsigned short *) PORTH_FER,
};
# if !defined(BF537_FAMILY)
static unsigned short * const port_mux[] = {
(unsigned short *) PORTF_MUX,
(unsigned short *) PORTG_MUX,
(unsigned short *) PORTH_MUX,
};
static const
u8 pmux_offset[][16] = {
# if defined(CONFIG_BF52x)
{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 4, 6, 8, 8, 10, 10 }, /* PORTF */
{ 0, 0, 0, 0, 0, 2, 2, 4, 4, 6, 8, 10, 10, 10, 12, 12 }, /* PORTG */
{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 4, 4, 4, 4, 4 }, /* PORTH */
# elif defined(CONFIG_BF51x)
{ 0, 2, 2, 2, 2, 2, 2, 4, 6, 6, 6, 8, 8, 8, 8, 10 }, /* PORTF */
{ 0, 0, 0, 2, 4, 6, 6, 6, 8, 10, 10, 12, 14, 14, 14, 14 }, /* PORTG */
{ 0, 0, 0, 0, 2, 2, 4, 6, 10, 10, 10, 10, 10, 10, 10, 10 }, /* PORTH */
# endif
};
# endif
#elif defined(BF538_FAMILY)
static unsigned short * const port_fer[] = {
(unsigned short *) PORTCIO_FER,
(unsigned short *) PORTDIO_FER,
(unsigned short *) PORTEIO_FER,
};
#endif
static unsigned short reserved_gpio_map[GPIO_BANK_NUM];
static unsigned short reserved_peri_map[gpio_bank(MAX_RESOURCES)];
static unsigned short reserved_gpio_irq_map[GPIO_BANK_NUM];
#define RESOURCE_LABEL_SIZE 16
static struct str_ident {
char name[RESOURCE_LABEL_SIZE];
} str_ident[MAX_RESOURCES];
#if defined(CONFIG_PM)
static struct gpio_port_s gpio_bank_saved[GPIO_BANK_NUM];
#endif
inline int check_gpio(unsigned gpio)
{
#if defined(CONFIG_BF54x)
if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
|| gpio == GPIO_PH14 || gpio == GPIO_PH15
|| gpio == GPIO_PJ14 || gpio == GPIO_PJ15)
return -EINVAL;
#endif
if (gpio >= MAX_BLACKFIN_GPIOS)
return -EINVAL;
return 0;
}
static void gpio_error(unsigned gpio)
{
printk(KERN_ERR "bfin-gpio: GPIO %d wasn't requested!\n", gpio);
}
static void set_label(unsigned short ident, const char *label)
{
if (label) {
strncpy(str_ident[ident].name, label,
RESOURCE_LABEL_SIZE);
str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
}
}
static char *get_label(unsigned short ident)
{
return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
}
static int cmp_label(unsigned short ident, const char *label)
{
if (label == NULL) {
dump_stack();
printk(KERN_ERR "Please provide none-null label\n");
}
if (label)
return strcmp(str_ident[ident].name, label);
else
return -EINVAL;
}
static void port_setup(unsigned gpio, unsigned short usage)
{
#if defined(BF538_FAMILY)
/*
* BF538/9 Port C,D and E are special.
* Inverted PORT_FER polarity on CDE and no PORF_FER on F
* Regular PORT F GPIOs are handled here, CDE are exclusively
* managed by GPIOLIB
*/
if (gpio < MAX_BLACKFIN_GPIOS || gpio >= MAX_RESOURCES)
return;
gpio -= MAX_BLACKFIN_GPIOS;
if (usage == GPIO_USAGE)
*port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
else
*port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
SSYNC();
return;
#endif
if (check_gpio(gpio))
return;
#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
if (usage == GPIO_USAGE)
*port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
else
*port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
SSYNC();
#elif defined(CONFIG_BF54x)
if (usage == GPIO_USAGE)
gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
else
gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
SSYNC();
#endif
}
#ifdef BF537_FAMILY
static struct {
unsigned short res;
unsigned short offset;
} port_mux_lut[] = {
{.res = P_PPI0_D13, .offset = 11},
{.res = P_PPI0_D14, .offset = 11},
{.res = P_PPI0_D15, .offset = 11},
{.res = P_SPORT1_TFS, .offset = 11},
{.res = P_SPORT1_TSCLK, .offset = 11},
{.res = P_SPORT1_DTPRI, .offset = 11},
{.res = P_PPI0_D10, .offset = 10},
{.res = P_PPI0_D11, .offset = 10},
{.res = P_PPI0_D12, .offset = 10},
{.res = P_SPORT1_RSCLK, .offset = 10},
{.res = P_SPORT1_RFS, .offset = 10},
{.res = P_SPORT1_DRPRI, .offset = 10},
{.res = P_PPI0_D8, .offset = 9},
{.res = P_PPI0_D9, .offset = 9},
{.res = P_SPORT1_DRSEC, .offset = 9},
{.res = P_SPORT1_DTSEC, .offset = 9},
{.res = P_TMR2, .offset = 8},
{.res = P_PPI0_FS3, .offset = 8},
{.res = P_TMR3, .offset = 7},
{.res = P_SPI0_SSEL4, .offset = 7},
{.res = P_TMR4, .offset = 6},
{.res = P_SPI0_SSEL5, .offset = 6},
{.res = P_TMR5, .offset = 5},
{.res = P_SPI0_SSEL6, .offset = 5},
{.res = P_UART1_RX, .offset = 4},
{.res = P_UART1_TX, .offset = 4},
{.res = P_TMR6, .offset = 4},
{.res = P_TMR7, .offset = 4},
{.res = P_UART0_RX, .offset = 3},
{.res = P_UART0_TX, .offset = 3},
{.res = P_DMAR0, .offset = 3},
{.res = P_DMAR1, .offset = 3},
{.res = P_SPORT0_DTSEC, .offset = 1},
{.res = P_SPORT0_DRSEC, .offset = 1},
{.res = P_CAN0_RX, .offset = 1},
{.res = P_CAN0_TX, .offset = 1},
{.res = P_SPI0_SSEL7, .offset = 1},
{.res = P_SPORT0_TFS, .offset = 0},
{.res = P_SPORT0_DTPRI, .offset = 0},
{.res = P_SPI0_SSEL2, .offset = 0},
{.res = P_SPI0_SSEL3, .offset = 0},
};
static void portmux_setup(unsigned short per)
{
u16 y, offset, muxreg;
u16 function = P_FUNCT2MUX(per);
for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) {
if (port_mux_lut[y].res == per) {
/* SET PORTMUX REG */
offset = port_mux_lut[y].offset;
muxreg = bfin_read_PORT_MUX();
if (offset != 1)
muxreg &= ~(1 << offset);
else
muxreg &= ~(3 << 1);
muxreg |= (function << offset);
bfin_write_PORT_MUX(muxreg);
}
}
}
#elif defined(CONFIG_BF54x)
inline void portmux_setup(unsigned short per)
{
u32 pmux;
u16 ident = P_IDENT(per);
u16 function = P_FUNCT2MUX(per);
pmux = gpio_array[gpio_bank(ident)]->port_mux;
pmux &= ~(0x3 << (2 * gpio_sub_n(ident)));
pmux |= (function & 0x3) << (2 * gpio_sub_n(ident));
gpio_array[gpio_bank(ident)]->port_mux = pmux;
}
inline u16 get_portmux(unsigned short per)
{
u32 pmux;
u16 ident = P_IDENT(per);
pmux = gpio_array[gpio_bank(ident)]->port_mux;
return (pmux >> (2 * gpio_sub_n(ident)) & 0x3);
}
#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
inline void portmux_setup(unsigned short per)
{
u16 pmux, ident = P_IDENT(per), function = P_FUNCT2MUX(per);
u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
pmux = *port_mux[gpio_bank(ident)];
pmux &= ~(3 << offset);
pmux |= (function & 3) << offset;
*port_mux[gpio_bank(ident)] = pmux;
SSYNC();
}
#else
# define portmux_setup(...) do { } while (0)
#endif
#ifndef CONFIG_BF54x
/***********************************************************
*
* FUNCTIONS: Blackfin General Purpose Ports Access Functions
*
* INPUTS/OUTPUTS:
* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
*
*
* DESCRIPTION: These functions abstract direct register access
* to Blackfin processor General Purpose
* Ports Regsiters
*
* CAUTION: These functions do not belong to the GPIO Driver API
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/
/* Set a specific bit */
#define SET_GPIO(name) \
void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
{ \
unsigned long flags; \
local_irq_save_hw(flags); \
if (arg) \
gpio_array[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
else \
gpio_array[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
AWA_DUMMY_READ(name); \
local_irq_restore_hw(flags); \
} \
EXPORT_SYMBOL(set_gpio_ ## name);
SET_GPIO(dir) /* set_gpio_dir() */
SET_GPIO(inen) /* set_gpio_inen() */
SET_GPIO(polar) /* set_gpio_polar() */
SET_GPIO(edge) /* set_gpio_edge() */
SET_GPIO(both) /* set_gpio_both() */
#define SET_GPIO_SC(name) \
void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
{ \
unsigned long flags; \
if (ANOMALY_05000311 || ANOMALY_05000323) \
local_irq_save_hw(flags); \
if (arg) \
gpio_array[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
else \
gpio_array[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
if (ANOMALY_05000311 || ANOMALY_05000323) { \
AWA_DUMMY_READ(name); \
local_irq_restore_hw(flags); \
} \
} \
EXPORT_SYMBOL(set_gpio_ ## name);
SET_GPIO_SC(maska)
SET_GPIO_SC(maskb)
SET_GPIO_SC(data)
void set_gpio_toggle(unsigned gpio)
{
unsigned long flags;
if (ANOMALY_05000311 || ANOMALY_05000323)
local_irq_save_hw(flags);
gpio_array[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
if (ANOMALY_05000311 || ANOMALY_05000323) {
AWA_DUMMY_READ(toggle);
local_irq_restore_hw(flags);
}
}
EXPORT_SYMBOL(set_gpio_toggle);
/*Set current PORT date (16-bit word)*/
#define SET_GPIO_P(name) \
void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
{ \
unsigned long flags; \
if (ANOMALY_05000311 || ANOMALY_05000323) \
local_irq_save_hw(flags); \
gpio_array[gpio_bank(gpio)]->name = arg; \
if (ANOMALY_05000311 || ANOMALY_05000323) { \
AWA_DUMMY_READ(name); \
local_irq_restore_hw(flags); \
} \
} \
EXPORT_SYMBOL(set_gpiop_ ## name);
SET_GPIO_P(data)
SET_GPIO_P(dir)
SET_GPIO_P(inen)
SET_GPIO_P(polar)
SET_GPIO_P(edge)
SET_GPIO_P(both)
SET_GPIO_P(maska)
SET_GPIO_P(maskb)
/* Get a specific bit */
#define GET_GPIO(name) \
unsigned short get_gpio_ ## name(unsigned gpio) \
{ \
unsigned long flags; \
unsigned short ret; \
if (ANOMALY_05000311 || ANOMALY_05000323) \
local_irq_save_hw(flags); \
ret = 0x01 & (gpio_array[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
if (ANOMALY_05000311 || ANOMALY_05000323) { \
AWA_DUMMY_READ(name); \
local_irq_restore_hw(flags); \
} \
return ret; \
} \
EXPORT_SYMBOL(get_gpio_ ## name);
GET_GPIO(data)
GET_GPIO(dir)
GET_GPIO(inen)
GET_GPIO(polar)
GET_GPIO(edge)
GET_GPIO(both)
GET_GPIO(maska)
GET_GPIO(maskb)
/*Get current PORT date (16-bit word)*/
#define GET_GPIO_P(name) \
unsigned short get_gpiop_ ## name(unsigned gpio) \
{ \
unsigned long flags; \
unsigned short ret; \
if (ANOMALY_05000311 || ANOMALY_05000323) \
local_irq_save_hw(flags); \
ret = (gpio_array[gpio_bank(gpio)]->name); \
if (ANOMALY_05000311 || ANOMALY_05000323) { \
AWA_DUMMY_READ(name); \
local_irq_restore_hw(flags); \
} \
return ret; \
} \
EXPORT_SYMBOL(get_gpiop_ ## name);
GET_GPIO_P(data)
GET_GPIO_P(dir)
GET_GPIO_P(inen)
GET_GPIO_P(polar)
GET_GPIO_P(edge)
GET_GPIO_P(both)
GET_GPIO_P(maska)
GET_GPIO_P(maskb)
#ifdef CONFIG_PM
static unsigned short wakeup_map[GPIO_BANK_NUM];
static const unsigned int sic_iwr_irqs[] = {
#if defined(BF533_FAMILY)
IRQ_PROG_INTB
#elif defined(BF537_FAMILY)
IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX
#elif defined(BF538_FAMILY)
IRQ_PORTF_INTB
#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
IRQ_PORTF_INTB, IRQ_PORTG_INTB, IRQ_PORTH_INTB
#elif defined(BF561_FAMILY)
IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB
#else
# error no SIC_IWR defined
#endif
};
/***********************************************************
*
* FUNCTIONS: Blackfin PM Setup API
*
* INPUTS/OUTPUTS:
* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
* type -
* PM_WAKE_RISING
* PM_WAKE_FALLING
* PM_WAKE_HIGH
* PM_WAKE_LOW
* PM_WAKE_BOTH_EDGES
*
* DESCRIPTION: Blackfin PM Driver API
*
* CAUTION:
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/
int gpio_pm_wakeup_ctrl(unsigned gpio, unsigned ctrl)
{
unsigned long flags;
if (check_gpio(gpio) < 0)
return -EINVAL;
local_irq_save_hw(flags);
if (ctrl)
wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio);
else
wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
set_gpio_maskb(gpio, ctrl);
local_irq_restore_hw(flags);
return 0;
}
int bfin_pm_standby_ctrl(unsigned ctrl)
{
u16 bank, mask, i;
for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
mask = wakeup_map[gpio_bank(i)];
bank = gpio_bank(i);
if (mask)
bfin_internal_set_wake(sic_iwr_irqs[bank], ctrl);
}
return 0;
}
void bfin_gpio_pm_hibernate_suspend(void)
{
int i, bank;
for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
bank = gpio_bank(i);
#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
gpio_bank_saved[bank].fer = *port_fer[bank];
#if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
gpio_bank_saved[bank].mux = *port_mux[bank];
#else
if (bank == 0)
gpio_bank_saved[bank].mux = bfin_read_PORT_MUX();
#endif
#endif
gpio_bank_saved[bank].data = gpio_array[bank]->data;
gpio_bank_saved[bank].inen = gpio_array[bank]->inen;
gpio_bank_saved[bank].polar = gpio_array[bank]->polar;
gpio_bank_saved[bank].dir = gpio_array[bank]->dir;
gpio_bank_saved[bank].edge = gpio_array[bank]->edge;
gpio_bank_saved[bank].both = gpio_array[bank]->both;
gpio_bank_saved[bank].maska = gpio_array[bank]->maska;
}
AWA_DUMMY_READ(maska);
}
void bfin_gpio_pm_hibernate_restore(void)
{
int i, bank;
for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
bank = gpio_bank(i);
#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
#if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
*port_mux[bank] = gpio_bank_saved[bank].mux;
#else
if (bank == 0)
bfin_write_PORT_MUX(gpio_bank_saved[bank].mux);
#endif
*port_fer[bank] = gpio_bank_saved[bank].fer;
#endif
gpio_array[bank]->inen = gpio_bank_saved[bank].inen;
gpio_array[bank]->data_set = gpio_bank_saved[bank].data
& gpio_bank_saved[bank].dir;
gpio_array[bank]->dir = gpio_bank_saved[bank].dir;
gpio_array[bank]->polar = gpio_bank_saved[bank].polar;
gpio_array[bank]->edge = gpio_bank_saved[bank].edge;
gpio_array[bank]->both = gpio_bank_saved[bank].both;
gpio_array[bank]->maska = gpio_bank_saved[bank].maska;
}
AWA_DUMMY_READ(maska);
}
#endif
#else /* CONFIG_BF54x */
#ifdef CONFIG_PM
int bfin_pm_standby_ctrl(unsigned ctrl)
{
return 0;
}
void bfin_gpio_pm_hibernate_suspend(void)
{
int i, bank;
for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
bank = gpio_bank(i);
gpio_bank_saved[bank].fer = gpio_array[bank]->port_fer;
gpio_bank_saved[bank].mux = gpio_array[bank]->port_mux;
gpio_bank_saved[bank].data = gpio_array[bank]->data;
gpio_bank_saved[bank].inen = gpio_array[bank]->inen;
gpio_bank_saved[bank].dir = gpio_array[bank]->dir_set;
}
}
void bfin_gpio_pm_hibernate_restore(void)
{
int i, bank;
for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
bank = gpio_bank(i);
gpio_array[bank]->port_mux = gpio_bank_saved[bank].mux;
gpio_array[bank]->port_fer = gpio_bank_saved[bank].fer;
gpio_array[bank]->inen = gpio_bank_saved[bank].inen;
gpio_array[bank]->dir_set = gpio_bank_saved[bank].dir;
gpio_array[bank]->data_set = gpio_bank_saved[bank].data
| gpio_bank_saved[bank].dir;
}
}
#endif
unsigned short get_gpio_dir(unsigned gpio)
{
return (0x01 & (gpio_array[gpio_bank(gpio)]->dir_clear >> gpio_sub_n(gpio)));
}
EXPORT_SYMBOL(get_gpio_dir);
#endif /* CONFIG_BF54x */
/***********************************************************
*
* FUNCTIONS: Blackfin Peripheral Resource Allocation
* and PortMux Setup
*
* INPUTS/OUTPUTS:
* per Peripheral Identifier
* label String
*
* DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
*
* CAUTION:
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/
int peripheral_request(unsigned short per, const char *label)
{
unsigned long flags;
unsigned short ident = P_IDENT(per);
/*
* Don't cares are pins with only one dedicated function
*/
if (per & P_DONTCARE)
return 0;
if (!(per & P_DEFINED))
return -ENODEV;
BUG_ON(ident >= MAX_RESOURCES);
local_irq_save_hw(flags);
/* If a pin can be muxed as either GPIO or peripheral, make
* sure it is not already a GPIO pin when we request it.
*/
if (unlikely(!check_gpio(ident) &&
reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
if (system_state == SYSTEM_BOOTING)
dump_stack();
printk(KERN_ERR
"%s: Peripheral %d is already reserved as GPIO by %s !\n",
__func__, ident, get_label(ident));
local_irq_restore_hw(flags);
return -EBUSY;
}
if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
/*
* Pin functions like AMC address strobes my
* be requested and used by several drivers
*/
#ifdef CONFIG_BF54x
if (!((per & P_MAYSHARE) && get_portmux(per) == P_FUNCT2MUX(per))) {
#else
if (!(per & P_MAYSHARE)) {
#endif
/*
* Allow that the identical pin function can
* be requested from the same driver twice
*/
if (cmp_label(ident, label) == 0)
goto anyway;
if (system_state == SYSTEM_BOOTING)
dump_stack();
printk(KERN_ERR
"%s: Peripheral %d function %d is already reserved by %s !\n",
__func__, ident, P_FUNCT2MUX(per), get_label(ident));
local_irq_restore_hw(flags);
return -EBUSY;
}
}
anyway:
reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
portmux_setup(per);
port_setup(ident, PERIPHERAL_USAGE);
local_irq_restore_hw(flags);
set_label(ident, label);
return 0;
}
EXPORT_SYMBOL(peripheral_request);
int peripheral_request_list(const unsigned short per[], const char *label)
{
u16 cnt;
int ret;
for (cnt = 0; per[cnt] != 0; cnt++) {
ret = peripheral_request(per[cnt], label);
if (ret < 0) {
for ( ; cnt > 0; cnt--)
peripheral_free(per[cnt - 1]);
return ret;
}
}
return 0;
}
EXPORT_SYMBOL(peripheral_request_list);
void peripheral_free(unsigned short per)
{
unsigned long flags;
unsigned short ident = P_IDENT(per);
if (per & P_DONTCARE)
return;
if (!(per & P_DEFINED))
return;
local_irq_save_hw(flags);
if (unlikely(!(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident)))) {
local_irq_restore_hw(flags);
return;
}
if (!(per & P_MAYSHARE))
port_setup(ident, GPIO_USAGE);
reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
set_label(ident, "free");
local_irq_restore_hw(flags);
}
EXPORT_SYMBOL(peripheral_free);
void peripheral_free_list(const unsigned short per[])
{
u16 cnt;
for (cnt = 0; per[cnt] != 0; cnt++)
peripheral_free(per[cnt]);
}
EXPORT_SYMBOL(peripheral_free_list);
/***********************************************************
*
* FUNCTIONS: Blackfin GPIO Driver
*
* INPUTS/OUTPUTS:
* gpio PIO Number between 0 and MAX_BLACKFIN_GPIOS
* label String
*
* DESCRIPTION: Blackfin GPIO Driver API
*
* CAUTION:
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/
int bfin_gpio_request(unsigned gpio, const char *label)
{
unsigned long flags;
if (check_gpio(gpio) < 0)
return -EINVAL;
local_irq_save_hw(flags);
/*
* Allow that the identical GPIO can
* be requested from the same driver twice
* Do nothing and return -
*/
if (cmp_label(gpio, label) == 0) {
local_irq_restore_hw(flags);
return 0;
}
if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
if (system_state == SYSTEM_BOOTING)
dump_stack();
printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
gpio, get_label(gpio));
local_irq_restore_hw(flags);
return -EBUSY;
}
if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
if (system_state == SYSTEM_BOOTING)
dump_stack();
printk(KERN_ERR
"bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
gpio, get_label(gpio));
local_irq_restore_hw(flags);
return -EBUSY;
}
if (unlikely(reserved_gpio_irq_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved as gpio-irq!"
" (Documentation/blackfin/bfin-gpio-notes.txt)\n", gpio);
}
#ifndef CONFIG_BF54x
else { /* Reset POLAR setting when acquiring a gpio for the first time */
set_gpio_polar(gpio, 0);
}
#endif
reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
set_label(gpio, label);
local_irq_restore_hw(flags);
port_setup(gpio, GPIO_USAGE);
return 0;
}
EXPORT_SYMBOL(bfin_gpio_request);
void bfin_gpio_free(unsigned gpio)
{
unsigned long flags;
if (check_gpio(gpio) < 0)
return;
might_sleep();
local_irq_save_hw(flags);
if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
if (system_state == SYSTEM_BOOTING)
dump_stack();
gpio_error(gpio);
local_irq_restore_hw(flags);
return;
}
reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
set_label(gpio, "free");
local_irq_restore_hw(flags);
}
EXPORT_SYMBOL(bfin_gpio_free);
#ifdef BFIN_SPECIAL_GPIO_BANKS
static unsigned short reserved_special_gpio_map[gpio_bank(MAX_RESOURCES)];
int bfin_special_gpio_request(unsigned gpio, const char *label)
{
unsigned long flags;
local_irq_save_hw(flags);
/*
* Allow that the identical GPIO can
* be requested from the same driver twice
* Do nothing and return -
*/
if (cmp_label(gpio, label) == 0) {
local_irq_restore_hw(flags);
return 0;
}
if (unlikely(reserved_special_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
local_irq_restore_hw(flags);
printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
gpio, get_label(gpio));
return -EBUSY;
}
if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
local_irq_restore_hw(flags);
printk(KERN_ERR
"bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
gpio, get_label(gpio));
return -EBUSY;
}
reserved_special_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
reserved_peri_map[gpio_bank(gpio)] |= gpio_bit(gpio);
set_label(gpio, label);
local_irq_restore_hw(flags);
port_setup(gpio, GPIO_USAGE);
return 0;
}
EXPORT_SYMBOL(bfin_special_gpio_request);
void bfin_special_gpio_free(unsigned gpio)
{
unsigned long flags;
might_sleep();
local_irq_save_hw(flags);
if (unlikely(!(reserved_special_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
gpio_error(gpio);
local_irq_restore_hw(flags);
return;
}
reserved_special_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
reserved_peri_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
set_label(gpio, "free");
local_irq_restore_hw(flags);
}
EXPORT_SYMBOL(bfin_special_gpio_free);
#endif
int bfin_gpio_irq_request(unsigned gpio, const char *label)
{
unsigned long flags;
if (check_gpio(gpio) < 0)
return -EINVAL;
local_irq_save_hw(flags);
if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
if (system_state == SYSTEM_BOOTING)
dump_stack();
printk(KERN_ERR
"bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
gpio, get_label(gpio));
local_irq_restore_hw(flags);
return -EBUSY;
}
if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))
printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved by %s! "
"(Documentation/blackfin/bfin-gpio-notes.txt)\n",
gpio, get_label(gpio));
reserved_gpio_irq_map[gpio_bank(gpio)] |= gpio_bit(gpio);
set_label(gpio, label);
local_irq_restore_hw(flags);
port_setup(gpio, GPIO_USAGE);
return 0;
}
void bfin_gpio_irq_free(unsigned gpio)
{
unsigned long flags;
if (check_gpio(gpio) < 0)
return;
local_irq_save_hw(flags);
if (unlikely(!(reserved_gpio_irq_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
if (system_state == SYSTEM_BOOTING)
dump_stack();
gpio_error(gpio);
local_irq_restore_hw(flags);
return;
}
reserved_gpio_irq_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
set_label(gpio, "free");
local_irq_restore_hw(flags);
}
static inline void __bfin_gpio_direction_input(unsigned gpio)
{
#ifdef CONFIG_BF54x
gpio_array[gpio_bank(gpio)]->dir_clear = gpio_bit(gpio);
#else
gpio_array[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
#endif
gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
}
int bfin_gpio_direction_input(unsigned gpio)
{
unsigned long flags;
if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
gpio_error(gpio);
return -EINVAL;
}
local_irq_save_hw(flags);
__bfin_gpio_direction_input(gpio);
AWA_DUMMY_READ(inen);
local_irq_restore_hw(flags);
return 0;
}
EXPORT_SYMBOL(bfin_gpio_direction_input);
void bfin_gpio_irq_prepare(unsigned gpio)
{
#ifdef CONFIG_BF54x
unsigned long flags;
#endif
port_setup(gpio, GPIO_USAGE);
#ifdef CONFIG_BF54x
local_irq_save_hw(flags);
__bfin_gpio_direction_input(gpio);
local_irq_restore_hw(flags);
#endif
}
void bfin_gpio_set_value(unsigned gpio, int arg)
{
if (arg)
gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
else
gpio_array[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
}
EXPORT_SYMBOL(bfin_gpio_set_value);
int bfin_gpio_direction_output(unsigned gpio, int value)
{
unsigned long flags;
if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
gpio_error(gpio);
return -EINVAL;
}
local_irq_save_hw(flags);
gpio_array[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
gpio_set_value(gpio, value);
#ifdef CONFIG_BF54x
gpio_array[gpio_bank(gpio)]->dir_set = gpio_bit(gpio);
#else
gpio_array[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
#endif
AWA_DUMMY_READ(dir);
local_irq_restore_hw(flags);
return 0;
}
EXPORT_SYMBOL(bfin_gpio_direction_output);
int bfin_gpio_get_value(unsigned gpio)
{
#ifdef CONFIG_BF54x
return (1 & (gpio_array[gpio_bank(gpio)]->data >> gpio_sub_n(gpio)));
#else
unsigned long flags;
if (unlikely(get_gpio_edge(gpio))) {
int ret;
local_irq_save_hw(flags);
set_gpio_edge(gpio, 0);
ret = get_gpio_data(gpio);
set_gpio_edge(gpio, 1);
local_irq_restore_hw(flags);
return ret;
} else
return get_gpio_data(gpio);
#endif
}
EXPORT_SYMBOL(bfin_gpio_get_value);
/* If we are booting from SPI and our board lacks a strong enough pull up,
* the core can reset and execute the bootrom faster than the resistor can
* pull the signal logically high. To work around this (common) error in
* board design, we explicitly set the pin back to GPIO mode, force /CS
* high, and wait for the electrons to do their thing.
*
* This function only makes sense to be called from reset code, but it
* lives here as we need to force all the GPIO states w/out going through
* BUG() checks and such.
*/
void bfin_reset_boot_spi_cs(unsigned short pin)
{
unsigned short gpio = P_IDENT(pin);
port_setup(gpio, GPIO_USAGE);
gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
AWA_DUMMY_READ(data_set);
udelay(1);
}
#if defined(CONFIG_PROC_FS)
static int gpio_proc_read(char *buf, char **start, off_t offset,
int len, int *unused_i, void *unused_v)
{
int c, irq, gpio, outlen = 0;
for (c = 0; c < MAX_RESOURCES; c++) {
irq = reserved_gpio_irq_map[gpio_bank(c)] & gpio_bit(c);
gpio = reserved_gpio_map[gpio_bank(c)] & gpio_bit(c);
if (!check_gpio(c) && (gpio || irq))
len = sprintf(buf, "GPIO_%d: \t%s%s \t\tGPIO %s\n", c,
get_label(c), (gpio && irq) ? " *" : "",
get_gpio_dir(c) ? "OUTPUT" : "INPUT");
else if (reserved_peri_map[gpio_bank(c)] & gpio_bit(c))
len = sprintf(buf, "GPIO_%d: \t%s \t\tPeripheral\n", c, get_label(c));
else
continue;
buf += len;
outlen += len;
}
return outlen;
}
static __init int gpio_register_proc(void)
{
struct proc_dir_entry *proc_gpio;
proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL);
if (proc_gpio)
proc_gpio->read_proc = gpio_proc_read;
return proc_gpio != NULL;
}
__initcall(gpio_register_proc);
#endif
#ifdef CONFIG_GPIOLIB
static int bfin_gpiolib_direction_input(struct gpio_chip *chip, unsigned gpio)
{
return bfin_gpio_direction_input(gpio);
}
static int bfin_gpiolib_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
{
return bfin_gpio_direction_output(gpio, level);
}
static int bfin_gpiolib_get_value(struct gpio_chip *chip, unsigned gpio)
{
return bfin_gpio_get_value(gpio);
}
static void bfin_gpiolib_set_value(struct gpio_chip *chip, unsigned gpio, int value)
{
return bfin_gpio_set_value(gpio, value);
}
static int bfin_gpiolib_gpio_request(struct gpio_chip *chip, unsigned gpio)
{
return bfin_gpio_request(gpio, chip->label);
}
static void bfin_gpiolib_gpio_free(struct gpio_chip *chip, unsigned gpio)
{
return bfin_gpio_free(gpio);
}
static int bfin_gpiolib_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
{
return gpio + GPIO_IRQ_BASE;
}
static struct gpio_chip bfin_chip = {
.label = "BFIN-GPIO",
.direction_input = bfin_gpiolib_direction_input,
.get = bfin_gpiolib_get_value,
.direction_output = bfin_gpiolib_direction_output,
.set = bfin_gpiolib_set_value,
.request = bfin_gpiolib_gpio_request,
.free = bfin_gpiolib_gpio_free,
.to_irq = bfin_gpiolib_gpio_to_irq,
.base = 0,
.ngpio = MAX_BLACKFIN_GPIOS,
};
static int __init bfin_gpiolib_setup(void)
{
return gpiochip_add(&bfin_chip);
}
arch_initcall(bfin_gpiolib_setup);
#endif
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