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[AVR32] Use per-controller spi_board_info structures

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Set up one spi_board_info array per controller and pass this to
at32_add_device_spi so that it can set up any GPIO pins for chip
selects based on this information.

Extracted from a patch by David Brownell and adapted slightly.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen 2007-02-16 13:56:11 +01:00
parent 23cebe2287
commit 41d8ca452f
3 changed files with 44 additions and 24 deletions
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9
arch/avr32/boards/atstk1000/atstk1002.c
View File

@ -8,7 +8,6 @@
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
@ -36,12 +35,11 @@ static struct eth_addr __initdata hw_addr[2];
static struct eth_platform_data __initdata eth_data[2];
extern struct lcdc_platform_data atstk1000_fb0_data;
static struct spi_board_info spi_board_info[] __initdata = {
static struct spi_board_info spi0_board_info[] __initdata = {
{
/* QVGA display */
.modalias = "ltv350qv",
.controller_data = (void *)GPIO_PIN_PA(4),
.max_speed_hz = 16000000,
.bus_num = 0,
.chip_select = 1,
},
};
@ -149,8 +147,7 @@ static int __init atstk1002_init(void)
set_hw_addr(at32_add_device_eth(0, &eth_data[0]));
spi_register_board_info(spi_board_info, ARRAY_SIZE(spi_board_info));
at32_add_device_spi(0);
at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
at32_add_device_lcdc(0, &atstk1000_fb0_data);
return 0;

55
arch/avr32/mach-at32ap/at32ap7000.c
View File

@ -8,6 +8,7 @@
#include <linux/clk.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <asm/io.h>
@ -751,8 +752,41 @@ static struct resource atmel_spi1_resource[] = {
DEFINE_DEV(atmel_spi, 1);
DEV_CLK(spi_clk, atmel_spi1, pba, 1);
struct platform_device *__init at32_add_device_spi(unsigned int id)
static void
at32_spi_setup_slaves(unsigned int bus_num, struct spi_board_info *b,
unsigned int n, const u8 *pins)
{
unsigned int pin, mode;
for (; n; n--, b++) {
b->bus_num = bus_num;
if (b->chip_select >= 4)
continue;
pin = (unsigned)b->controller_data;
if (!pin) {
pin = pins[b->chip_select];
b->controller_data = (void *)pin;
}
mode = AT32_GPIOF_OUTPUT;
if (!(b->mode & SPI_CS_HIGH))
mode |= AT32_GPIOF_HIGH;
at32_select_gpio(pin, mode);
}
}
struct platform_device *__init
at32_add_device_spi(unsigned int id, struct spi_board_info *b, unsigned int n)
{
/*
* Manage the chipselects as GPIOs, normally using the same pins
* the SPI controller expects; but boards can use other pins.
*/
static u8 __initdata spi0_pins[] =
{ GPIO_PIN_PA(3), GPIO_PIN_PA(4),
GPIO_PIN_PA(5), GPIO_PIN_PA(20), };
static u8 __initdata spi1_pins[] =
{ GPIO_PIN_PB(2), GPIO_PIN_PB(3),
GPIO_PIN_PB(4), GPIO_PIN_PA(27), };
struct platform_device *pdev;
switch (id) {
@ -761,14 +795,7 @@ struct platform_device *__init at32_add_device_spi(unsigned int id)
select_peripheral(PA(0), PERIPH_A, 0); /* MISO */
select_peripheral(PA(1), PERIPH_A, 0); /* MOSI */
select_peripheral(PA(2), PERIPH_A, 0); /* SCK */
/* NPCS[2:0] */
at32_select_gpio(GPIO_PIN_PA(3),
AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
at32_select_gpio(GPIO_PIN_PA(4),
AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
at32_select_gpio(GPIO_PIN_PA(5),
AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
at32_spi_setup_slaves(0, b, n, spi0_pins);
break;
case 1:
@ -776,20 +803,14 @@ struct platform_device *__init at32_add_device_spi(unsigned int id)
select_peripheral(PB(0), PERIPH_B, 0); /* MISO */
select_peripheral(PB(1), PERIPH_B, 0); /* MOSI */
select_peripheral(PB(5), PERIPH_B, 0); /* SCK */
/* NPCS[2:0] */
at32_select_gpio(GPIO_PIN_PB(2),
AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
at32_select_gpio(GPIO_PIN_PB(3),
AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
at32_select_gpio(GPIO_PIN_PB(4),
AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
at32_spi_setup_slaves(1, b, n, spi1_pins);
break;
default:
return NULL;
}
spi_register_board_info(b, n);
platform_device_register(pdev);
return pdev;
}

4
include/asm-avr32/arch-at32ap/board.h
View File

@ -26,7 +26,9 @@ struct eth_platform_data {
struct platform_device *
at32_add_device_eth(unsigned int id, struct eth_platform_data *data);
struct platform_device *at32_add_device_spi(unsigned int id);
struct spi_board_info;
struct platform_device *
at32_add_device_spi(unsigned int id, struct spi_board_info *b, unsigned int n);
struct lcdc_platform_data {
unsigned long fbmem_start;