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authorMichael Hennerich <michael.hennerich@analog.com>2007-07-12 12:32:52 +0800
committerBryan Wu <bryan.wu@analog.com>2007-07-12 12:32:52 +0800
commit5610db61cf2945a5e74667e952f2792c96ba53a1 (patch)
tree982c8cdb8267ac0a162b4de5d3d3b545adcff602 /arch/blackfin
parent520473b0775ce046d179afa686fb3222884c389d (diff)
downloadlinux-2.6.34-ux500-5610db61cf2945a5e74667e952f2792c96ba53a1.tar.gz
Blackfin arch: Add Support for Peripheral PortMux and resouce allocation
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/mach-bf548/gpio.c189
1 files changed, 160 insertions, 29 deletions
diff --git a/arch/blackfin/mach-bf548/gpio.c b/arch/blackfin/mach-bf548/gpio.c
index 9b1a00aabf2..0da5f0003b8 100644
--- a/arch/blackfin/mach-bf548/gpio.c
+++ b/arch/blackfin/mach-bf548/gpio.c
@@ -31,38 +31,64 @@
#include <linux/err.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
+#include <asm/portmux.h>
#include <linux/irq.h>
static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
- (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,
+ (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,
};
-static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned short reserved_peri_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
inline int check_gpio(unsigned short gpio)
{
- if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15 \
- || gpio == GPIO_PH14 || gpio == GPIO_PH15 \
- || gpio == GPIO_PJ14 || gpio == GPIO_PJ15 \
- || gpio > MAX_BLACKFIN_GPIOS)
+ if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
+ || gpio == GPIO_PH14 || gpio == GPIO_PH15
+ || gpio == GPIO_PJ14 || gpio == GPIO_PJ15
+ || gpio > MAX_BLACKFIN_GPIOS)
return -EINVAL;
return 0;
}
+inline void portmux_setup(unsigned short portno, unsigned short function)
+{
+ u32 pmux;
+
+ pmux = gpio_array[gpio_bank(portno)]->port_mux;
+
+ pmux &= ~(0x3 << (2 * gpio_sub_n(portno)));
+ pmux |= (function & 0x3) << (2 * gpio_sub_n(portno));
+
+ gpio_array[gpio_bank(portno)]->port_mux = pmux;
+
+}
+
+inline u16 get_portmux(unsigned short portno)
+{
+ u32 pmux;
+
+ pmux = gpio_array[gpio_bank(portno)]->port_mux;
+
+ return (pmux >> (2 * gpio_sub_n(portno)) & 0x3);
+
+}
+
static void port_setup(unsigned short gpio, unsigned short usage)
{
if (usage == GPIO_USAGE) {
if (gpio_array[gpio_bank(gpio)]->port_fer & gpio_bit(gpio))
- printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral "
+ printk(KERN_WARNING
+ "bfin-gpio: Possible Conflict with Peripheral "
"usage and GPIO %d detected!\n", gpio);
gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
} else
@@ -72,18 +98,116 @@ static void port_setup(unsigned short gpio, unsigned short usage)
static int __init bfin_gpio_init(void)
{
- int i;
-
printk(KERN_INFO "Blackfin GPIO Controller\n");
- for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE)
- reserved_map[gpio_bank(i)] = 0;
-
return 0;
}
arch_initcall(bfin_gpio_init);
+int peripheral_request(unsigned short per, const char *label)
+{
+ unsigned long flags;
+ unsigned short ident = P_IDENT(per);
+
+ if (!(per & P_DEFINED))
+ return -ENODEV;
+
+ if (check_gpio(ident) < 0)
+ return -EINVAL;
+
+ local_irq_save(flags);
+
+ if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
+ printk(KERN_ERR
+ "%s: Peripheral %d is already reserved as GPIO!\n",
+ __FUNCTION__, per);
+ dump_stack();
+ local_irq_restore(flags);
+ return -EBUSY;
+ }
+
+ if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
+
+ u16 funct = get_portmux(ident);
+
+ if (!((per & P_MAYSHARE) && (funct == P_FUNCT2MUX(per)))) {
+ printk(KERN_ERR
+ "%s: Peripheral %d is already reserved!\n",
+ __FUNCTION__, per);
+ dump_stack();
+ local_irq_restore(flags);
+ return -EBUSY;
+ }
+ }
+
+ reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
+
+ portmux_setup(ident, P_FUNCT2MUX(per));
+ port_setup(ident, PERIPHERAL_USAGE);
+
+ local_irq_restore(flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(peripheral_request);
+
+int peripheral_request_list(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)
+ 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_DEFINED))
+ return;
+
+ if (check_gpio(ident) < 0)
+ return;
+
+ local_irq_save(flags);
+
+ if (unlikely(!(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident)))) {
+ printk(KERN_ERR "bfin-gpio: Peripheral %d wasn't reserved!\n", per);
+ dump_stack();
+ local_irq_restore(flags);
+ return;
+ }
+
+ if (!(per & P_MAYSHARE)) {
+ port_setup(ident, GPIO_USAGE);
+ }
+
+ reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
+
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(peripheral_free);
+
+void peripheral_free_list(unsigned short per[])
+{
+ u16 cnt;
+
+ for (cnt = 0; per[cnt] != 0; cnt++) {
+ peripheral_free(per[cnt]);
+ }
+
+}
+EXPORT_SYMBOL(peripheral_free_list);
/***********************************************************
*
@@ -109,13 +233,22 @@ int gpio_request(unsigned short gpio, const char *label)
local_irq_save(flags);
- if (unlikely(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
+ if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
dump_stack();
local_irq_restore(flags);
return -EBUSY;
}
- reserved_map[gpio_bank(gpio)] |= gpio_bit(gpio);
+
+ if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
+ printk(KERN_ERR
+ "bfin-gpio: GPIO %d is already reserved as Peripheral!\n", gpio);
+ dump_stack();
+ local_irq_restore(flags);
+ return -EBUSY;
+ }
+
+ reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
local_irq_restore(flags);
@@ -125,7 +258,6 @@ int gpio_request(unsigned short gpio, const char *label)
}
EXPORT_SYMBOL(gpio_request);
-
void gpio_free(unsigned short gpio)
{
unsigned long flags;
@@ -135,25 +267,24 @@ void gpio_free(unsigned short gpio)
local_irq_save(flags);
- if (unlikely(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
+ if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
dump_stack();
local_irq_restore(flags);
return;
}
- reserved_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+ reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_free);
-
void gpio_direction_input(unsigned short gpio)
{
unsigned long flags;
- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
@@ -166,7 +297,7 @@ void gpio_direction_output(unsigned short gpio)
{
unsigned long flags;
- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);