at91rm9200_devices.c

linux 内核源代码

	.name			= "i2c-gpio",
	.id			= -1,
	.dev.platform_data	= &pdata,
};

void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
{
	at91_set_GPIO_periph(AT91_PIN_PA25, 1);		/* TWD (SDA) */
	at91_set_multi_drive(AT91_PIN_PA25, 1);

	at91_set_GPIO_periph(AT91_PIN_PA26, 1);		/* TWCK (SCL) */
	at91_set_multi_drive(AT91_PIN_PA26, 1);

	i2c_register_board_info(0, devices, nr_devices);
	platform_device_register(&at91rm9200_twi_device);
}

#elif defined(CONFIG_I2C_AT91) || defined(CONFIG_I2C_AT91_MODULE)

static struct resource twi_resources[] = {
	[0] = {
		.start	= AT91RM9200_BASE_TWI,
		.end	= AT91RM9200_BASE_TWI + SZ_16K - 1,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= AT91RM9200_ID_TWI,
		.end	= AT91RM9200_ID_TWI,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct platform_device at91rm9200_twi_device = {
	.name		= "at91_i2c",
	.id		= -1,
	.resource	= twi_resources,
	.num_resources	= ARRAY_SIZE(twi_resources),
};

void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices)
{
	/* pins used for TWI interface */
	at91_set_A_periph(AT91_PIN_PA25, 0);		/* TWD */
	at91_set_multi_drive(AT91_PIN_PA25, 1);

	at91_set_A_periph(AT91_PIN_PA26, 0);		/* TWCK */
	at91_set_multi_drive(AT91_PIN_PA26, 1);

	i2c_register_board_info(0, devices, nr_devices);
	platform_device_register(&at91rm9200_twi_device);
}
#else
void __init at91_add_device_i2c(struct i2c_board_info *devices, int nr_devices) {}
#endif


/* --------------------------------------------------------------------
 *  SPI
 * -------------------------------------------------------------------- */

#if defined(CONFIG_SPI_ATMEL) || defined(CONFIG_SPI_ATMEL_MODULE)
static u64 spi_dmamask = 0xffffffffUL;

static struct resource spi_resources[] = {
	[0] = {
		.start	= AT91RM9200_BASE_SPI,
		.end	= AT91RM9200_BASE_SPI + SZ_16K - 1,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= AT91RM9200_ID_SPI,
		.end	= AT91RM9200_ID_SPI,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct platform_device at91rm9200_spi_device = {
	.name		= "atmel_spi",
	.id		= 0,
	.dev		= {
				.dma_mask		= &spi_dmamask,
				.coherent_dma_mask	= 0xffffffff,
	},
	.resource	= spi_resources,
	.num_resources	= ARRAY_SIZE(spi_resources),
};

static const unsigned spi_standard_cs[4] = { AT91_PIN_PA3, AT91_PIN_PA4, AT91_PIN_PA5, AT91_PIN_PA6 };

void __init at91_add_device_spi(struct spi_board_info *devices, int nr_devices)
{
	int i;
	unsigned long cs_pin;

	at91_set_A_periph(AT91_PIN_PA0, 0);	/* MISO */
	at91_set_A_periph(AT91_PIN_PA1, 0);	/* MOSI */
	at91_set_A_periph(AT91_PIN_PA2, 0);	/* SPCK */

	/* Enable SPI chip-selects */
	for (i = 0; i < nr_devices; i++) {
		if (devices[i].controller_data)
			cs_pin = (unsigned long) devices[i].controller_data;
		else
			cs_pin = spi_standard_cs[devices[i].chip_select];

		/* enable chip-select pin */
		at91_set_gpio_output(cs_pin, 1);

		/* pass chip-select pin to driver */
		devices[i].controller_data = (void *) cs_pin;
	}

	spi_register_board_info(devices, nr_devices);
	platform_device_register(&at91rm9200_spi_device);
}
#else
void __init at91_add_device_spi(struct spi_board_info *devices, int nr_devices) {}
#endif


/* --------------------------------------------------------------------
 *  RTC
 * -------------------------------------------------------------------- */

#if defined(CONFIG_RTC_DRV_AT91RM9200) || defined(CONFIG_RTC_DRV_AT91RM9200_MODULE)
static struct platform_device at91rm9200_rtc_device = {
	.name		= "at91_rtc",
	.id		= -1,
	.num_resources	= 0,
};

static void __init at91_add_device_rtc(void)
{
	platform_device_register(&at91rm9200_rtc_device);
}
#else
static void __init at91_add_device_rtc(void) {}
#endif


/* --------------------------------------------------------------------
 *  Watchdog
 * -------------------------------------------------------------------- */

#if defined(CONFIG_AT91RM9200_WATCHDOG) || defined(CONFIG_AT91RM9200_WATCHDOG_MODULE)
static struct platform_device at91rm9200_wdt_device = {
	.name		= "at91_wdt",
	.id		= -1,
	.num_resources	= 0,
};

static void __init at91_add_device_watchdog(void)
{
	platform_device_register(&at91rm9200_wdt_device);
}
#else
static void __init at91_add_device_watchdog(void) {}
#endif


/* --------------------------------------------------------------------
 *  LEDs
 * -------------------------------------------------------------------- */

#if defined(CONFIG_LEDS)
u8 at91_leds_cpu;
u8 at91_leds_timer;

void __init at91_init_leds(u8 cpu_led, u8 timer_led)
{
	/* Enable GPIO to access the LEDs */
	at91_set_gpio_output(cpu_led, 1);
	at91_set_gpio_output(timer_led, 1);

	at91_leds_cpu	= cpu_led;
	at91_leds_timer	= timer_led;
}
#else
void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}
#endif


/* --------------------------------------------------------------------
 *  UART
 * -------------------------------------------------------------------- */

#if defined(CONFIG_SERIAL_ATMEL)
static struct resource dbgu_resources[] = {
	[0] = {
		.start	= AT91_VA_BASE_SYS + AT91_DBGU,
		.end	= AT91_VA_BASE_SYS + AT91_DBGU + SZ_512 - 1,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= AT91_ID_SYS,
		.end	= AT91_ID_SYS,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct atmel_uart_data dbgu_data = {
	.use_dma_tx	= 0,
	.use_dma_rx	= 0,		/* DBGU not capable of receive DMA */
	.regs		= (void __iomem *)(AT91_VA_BASE_SYS + AT91_DBGU),
};

static struct platform_device at91rm9200_dbgu_device = {
	.name		= "atmel_usart",
	.id		= 0,
	.dev		= {
				.platform_data	= &dbgu_data,
				.coherent_dma_mask = 0xffffffff,
	},
	.resource	= dbgu_resources,
	.num_resources	= ARRAY_SIZE(dbgu_resources),
};

static inline void configure_dbgu_pins(void)
{
	at91_set_A_periph(AT91_PIN_PA30, 0);		/* DRXD */
	at91_set_A_periph(AT91_PIN_PA31, 1);		/* DTXD */
}

static struct resource uart0_resources[] = {
	[0] = {
		.start	= AT91RM9200_BASE_US0,
		.end	= AT91RM9200_BASE_US0 + SZ_16K - 1,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= AT91RM9200_ID_US0,
		.end	= AT91RM9200_ID_US0,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct atmel_uart_data uart0_data = {
	.use_dma_tx	= 1,
	.use_dma_rx	= 1,
};

static struct platform_device at91rm9200_uart0_device = {
	.name		= "atmel_usart",
	.id		= 1,
	.dev		= {
				.platform_data	= &uart0_data,
				.coherent_dma_mask = 0xffffffff,
	},
	.resource	= uart0_resources,
	.num_resources	= ARRAY_SIZE(uart0_resources),
};

static inline void configure_usart0_pins(void)
{
	at91_set_A_periph(AT91_PIN_PA17, 1);		/* TXD0 */
	at91_set_A_periph(AT91_PIN_PA18, 0);		/* RXD0 */
	at91_set_A_periph(AT91_PIN_PA20, 0);		/* CTS0 */

	/*
	 * AT91RM9200 Errata #39 - RTS0 is not internally connected to PA21.
	 *  We need to drive the pin manually.  Default is off (RTS is active low).
	 */
	at91_set_gpio_output(AT91_PIN_PA21, 1);
}

static struct resource uart1_resources[] = {
	[0] = {
		.start	= AT91RM9200_BASE_US1,
		.end	= AT91RM9200_BASE_US1 + SZ_16K - 1,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= AT91RM9200_ID_US1,
		.end	= AT91RM9200_ID_US1,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct atmel_uart_data uart1_data = {
	.use_dma_tx	= 1,
	.use_dma_rx	= 1,
};

static struct platform_device at91rm9200_uart1_device = {
	.name		= "atmel_usart",
	.id		= 2,
	.dev		= {
				.platform_data	= &uart1_data,
				.coherent_dma_mask = 0xffffffff,
	},
	.resource	= uart1_resources,
	.num_resources	= ARRAY_SIZE(uart1_resources),
};

static inline void configure_usart1_pins(void)
{
	at91_set_A_periph(AT91_PIN_PB18, 0);		/* RI1 */
	at91_set_A_periph(AT91_PIN_PB19, 0);		/* DTR1 */
	at91_set_A_periph(AT91_PIN_PB20, 1);		/* TXD1 */
	at91_set_A_periph(AT91_PIN_PB21, 0);		/* RXD1 */
	at91_set_A_periph(AT91_PIN_PB23, 0);		/* DCD1 */
	at91_set_A_periph(AT91_PIN_PB24, 0);		/* CTS1 */
	at91_set_A_periph(AT91_PIN_PB25, 0);		/* DSR1 */
	at91_set_A_periph(AT91_PIN_PB26, 0);		/* RTS1 */
}

static struct resource uart2_resources[] = {
	[0] = {
		.start	= AT91RM9200_BASE_US2,
		.end	= AT91RM9200_BASE_US2 + SZ_16K - 1,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= AT91RM9200_ID_US2,
		.end	= AT91RM9200_ID_US2,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct atmel_uart_data uart2_data = {
	.use_dma_tx	= 1,
	.use_dma_rx	= 1,
};

static struct platform_device at91rm9200_uart2_device = {
	.name		= "atmel_usart",
	.id		= 3,
	.dev		= {
				.platform_data	= &uart2_data,
				.coherent_dma_mask = 0xffffffff,
	},
	.resource	= uart2_resources,
	.num_resources	= ARRAY_SIZE(uart2_resources),
};

static inline void configure_usart2_pins(void)
{
	at91_set_A_periph(AT91_PIN_PA22, 0);		/* RXD2 */
	at91_set_A_periph(AT91_PIN_PA23, 1);		/* TXD2 */
}

static struct resource uart3_resources[] = {
	[0] = {
		.start	= AT91RM9200_BASE_US3,
		.end	= AT91RM9200_BASE_US3 + SZ_16K - 1,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= AT91RM9200_ID_US3,
		.end	= AT91RM9200_ID_US3,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct atmel_uart_data uart3_data = {
	.use_dma_tx	= 1,
	.use_dma_rx	= 1,
};

static struct platform_device at91rm9200_uart3_device = {
	.name		= "atmel_usart",
	.id		= 4,
	.dev		= {
				.platform_data	= &uart3_data,
				.coherent_dma_mask = 0xffffffff,
	},
	.resource	= uart3_resources,
	.num_resources	= ARRAY_SIZE(uart3_resources),
};

static inline void configure_usart3_pins(void)
{
	at91_set_B_periph(AT91_PIN_PA5, 1);		/* TXD3 */
	at91_set_B_periph(AT91_PIN_PA6, 0);		/* RXD3 */
}

struct platform_device *at91_uarts[ATMEL_MAX_UART];	/* the UARTs to use */
struct platform_device *atmel_default_console_device;	/* the serial console device */

void __init at91_init_serial(struct at91_uart_config *config)
{
	int i;

	/* Fill in list of supported UARTs */
	for (i = 0; i < config->nr_tty; i++) {
		switch (config->tty_map[i]) {
			case 0:
				configure_usart0_pins();
				at91_uarts[i] = &at91rm9200_uart0_device;
				at91_clock_associate("usart0_clk", &at91rm9200_uart0_device.dev, "usart");
				break;
			case 1:
				configure_usart1_pins();
				at91_uarts[i] = &at91rm9200_uart1_device;
				at91_clock_associate("usart1_clk", &at91rm9200_uart1_device.dev, "usart");
				break;
			case 2:
				configure_usart2_pins();
				at91_uarts[i] = &at91rm9200_uart2_device;
				at91_clock_associate("usart2_clk", &at91rm9200_uart2_device.dev, "usart");
				break;
			case 3:
				configure_usart3_pins();
				at91_uarts[i] = &at91rm9200_uart3_device;
				at91_clock_associate("usart3_clk", &at91rm9200_uart3_device.dev, "usart");
				break;
			case 4:
				configure_dbgu_pins();
				at91_uarts[i] = &at91rm9200_dbgu_device;
				at91_clock_associate("mck", &at91rm9200_dbgu_device.dev, "usart");
				break;
			default:
				continue;
		}
		at91_uarts[i]->id = i;		/* update ID number to mapped ID */
	}

	/* Set serial console device */
	if (config->console_tty < ATMEL_MAX_UART)
		atmel_default_console_device = at91_uarts[config->console_tty];
	if (!atmel_default_console_device)
		printk(KERN_INFO "AT91: No default serial console defined.\n");
}

void __init at91_add_device_serial(void)
{
	int i;

	for (i = 0; i < ATMEL_MAX_UART; i++) {
		if (at91_uarts[i])
			platform_device_register(at91_uarts[i]);
	}
}
#else
void __init at91_init_serial(struct at91_uart_config *config) {}
void __init at91_add_device_serial(void) {}
#endif


/* -------------------------------------------------------------------- */

/*
 * These devices are always present and don't need any board-specific
 * setup.
 */
static int __init at91_add_standard_devices(void)
{
	at91_add_device_rtc();
	at91_add_device_watchdog();
	return 0;
}

arch_initcall(at91_add_standard_devices);