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Blackfin arch: Add Support for Peripheral PortMux and resouce allocation
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Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
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Michael Hennerich authored and Bryan Wu committed Jul 12, 2007
1 parent 520473b commit 5610db6
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Showing 7 changed files with 1,874 additions and 29 deletions.
189 changes: 160 additions & 29 deletions arch/blackfin/mach-bf548/gpio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand All @@ -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);

/***********************************************************
*
Expand All @@ -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);

Expand All @@ -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;
Expand All @@ -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);
Expand All @@ -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);
Expand Down
50 changes: 50 additions & 0 deletions include/asm-blackfin/gpio.h
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Original file line number Diff line number Diff line change
Expand Up @@ -210,6 +210,56 @@

#ifdef BF561_FAMILY
#define MAX_BLACKFIN_GPIOS 48

#define GPIO_PF0 0
#define GPIO_PF1 1
#define GPIO_PF2 2
#define GPIO_PF3 3
#define GPIO_PF4 4
#define GPIO_PF5 5
#define GPIO_PF6 6
#define GPIO_PF7 7
#define GPIO_PF8 8
#define GPIO_PF9 9
#define GPIO_PF10 10
#define GPIO_PF11 11
#define GPIO_PF12 12
#define GPIO_PF13 13
#define GPIO_PF14 14
#define GPIO_PF15 15
#define GPIO_PF16 16
#define GPIO_PF17 17
#define GPIO_PF18 18
#define GPIO_PF19 19
#define GPIO_PF20 20
#define GPIO_PF21 21
#define GPIO_PF22 22
#define GPIO_PF23 23
#define GPIO_PF24 24
#define GPIO_PF25 25
#define GPIO_PF26 26
#define GPIO_PF27 27
#define GPIO_PF28 28
#define GPIO_PF29 29
#define GPIO_PF30 30
#define GPIO_PF31 31
#define GPIO_PF32 32
#define GPIO_PF33 33
#define GPIO_PF34 34
#define GPIO_PF35 35
#define GPIO_PF36 36
#define GPIO_PF37 37
#define GPIO_PF38 38
#define GPIO_PF39 39
#define GPIO_PF40 40
#define GPIO_PF41 41
#define GPIO_PF42 42
#define GPIO_PF43 43
#define GPIO_PF44 44
#define GPIO_PF45 45
#define GPIO_PF46 46
#define GPIO_PF47 47

#define PORT_FIO0 GPIO_0
#define PORT_FIO1 GPIO_16
#define PORT_FIO2 GPIO_32
Expand Down
65 changes: 65 additions & 0 deletions include/asm-blackfin/mach-bf533/portmux.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,65 @@
#ifndef _MACH_PORTMUX_H_
#define _MACH_PORTMUX_H_

#define P_PPI0_CLK (P_DONTCARE)
#define P_PPI0_FS1 (P_DONTCARE)
#define P_PPI0_FS2 (P_DONTCARE)
#define P_PPI0_FS3 (P_DEFINED | P_IDENT(GPIO_PF3))
#define P_PPI0_D15 (P_DEFINED | P_IDENT(GPIO_PF4))
#define P_PPI0_D14 (P_DEFINED | P_IDENT(GPIO_PF5))
#define P_PPI0_D13 (P_DEFINED | P_IDENT(GPIO_PF6))
#define P_PPI0_D12 (P_DEFINED | P_IDENT(GPIO_PF7))
#define P_PPI0_D11 (P_DEFINED | P_IDENT(GPIO_PF8))
#define P_PPI0_D10 (P_DEFINED | P_IDENT(GPIO_PF9))
#define P_PPI0_D9 (P_DEFINED | P_IDENT(GPIO_PF10))
#define P_PPI0_D8 (P_DEFINED | P_IDENT(GPIO_PF11))
#define P_PPI0_D0 (P_DONTCARE)
#define P_PPI0_D1 (P_DONTCARE)
#define P_PPI0_D2 (P_DONTCARE)
#define P_PPI0_D3 (P_DONTCARE)
#define P_PPI0_D4 (P_DEFINED | P_IDENT(GPIO_PF15))
#define P_PPI0_D5 (P_DEFINED | P_IDENT(GPIO_PF14))
#define P_PPI0_D6 (P_DEFINED | P_IDENT(GPIO_PF13))
#define P_PPI0_D7 (P_DEFINED | P_IDENT(GPIO_PF12))

#define P_SPORT1_TSCLK (P_DONTCARE)
#define P_SPORT1_RSCLK (P_DONTCARE)
#define P_SPORT0_TSCLK (P_DONTCARE)
#define P_SPORT0_RSCLK (P_DONTCARE)
#define P_UART0_RX (P_DONTCARE)
#define P_UART0_TX (P_DONTCARE)
#define P_SPORT1_DRSEC (P_DONTCARE)
#define P_SPORT1_RFS (P_DONTCARE)
#define P_SPORT1_DTPRI (P_DONTCARE)
#define P_SPORT1_DTSEC (P_DONTCARE)
#define P_SPORT1_TFS (P_DONTCARE)
#define P_SPORT1_DRPRI (P_DONTCARE)
#define P_SPORT0_DRSEC (P_DONTCARE)
#define P_SPORT0_RFS (P_DONTCARE)
#define P_SPORT0_DTPRI (P_DONTCARE)
#define P_SPORT0_DTSEC (P_DONTCARE)
#define P_SPORT0_TFS (P_DONTCARE)
#define P_SPORT0_DRPRI (P_DONTCARE)

#define P_SPI0_MOSI (P_DONTCARE)
#define P_SPI0_MIS0 (P_DONTCARE)
#define P_SPI0_SCK (P_DONTCARE)
#define P_SPI0_SSEL7 (P_DEFINED | P_IDENT(GPIO_PF7))
#define P_SPI0_SSEL6 (P_DEFINED | P_IDENT(GPIO_PF6))
#define P_SPI0_SSEL5 (P_DEFINED | P_IDENT(GPIO_PF5))
#define P_SPI0_SSEL4 (P_DEFINED | P_IDENT(GPIO_PF4))
#define P_SPI0_SSEL3 (P_DEFINED | P_IDENT(GPIO_PF3))
#define P_SPI0_SSEL2 (P_DEFINED | P_IDENT(GPIO_PF2))
#define P_SPI0_SSEL1 (P_DEFINED | P_IDENT(GPIO_PF1))
#define P_SPI0_SS (P_DEFINED | P_IDENT(GPIO_PF0))

#define P_TMR2 (P_DONTCARE)
#define P_TMR1 (P_DONTCARE)
#define P_TMR0 (P_DONTCARE)
#define P_TMRCLK (P_DEFINED | P_IDENT(GPIO_PF1))





#endif /* _MACH_PORTMUX_H_ */
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