From c8f385a631ef1f49d67a3798ca40dec36ccdf07d Mon Sep 17 00:00:00 2001 From: Andrew Victor Date: Wed, 23 Jan 2008 09:25:15 +0100 Subject: [ARM] 4757/1: [AT91] UART initialization Modify the UART initialization to allow the board-initialization code to specify which pins are connected, and which pins should therefore be initialized. The current at91_init_serial() will continue to work as-is, but is marked as "deprecated" and will be removed once the board-specific files has been updated to use the new interface. As in the AVR32 code, we assume that the TX and RX pins will always be initialized. Signed-off-by: Andrew Victor Signed-off-by: Russell King --- arch/arm/mach-at91/at91rm9200_devices.c | 114 ++++++++++++++++++++++++++------ 1 file changed, 92 insertions(+), 22 deletions(-) (limited to 'arch/arm/mach-at91/at91rm9200_devices.c') diff --git a/arch/arm/mach-at91/at91rm9200_devices.c b/arch/arm/mach-at91/at91rm9200_devices.c index a2647265c21..23966229ea9 100644 --- a/arch/arm/mach-at91/at91rm9200_devices.c +++ b/arch/arm/mach-at91/at91rm9200_devices.c @@ -884,17 +884,21 @@ static struct platform_device at91rm9200_uart0_device = { .num_resources = ARRAY_SIZE(uart0_resources), }; -static inline void configure_usart0_pins(void) +static inline void configure_usart0_pins(unsigned pins) { 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); + if (pins & ATMEL_UART_CTS) + at91_set_A_periph(AT91_PIN_PA20, 0); /* CTS0 */ + + if (pins & ATMEL_UART_RTS) { + /* + * 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[] = { @@ -929,16 +933,23 @@ static struct platform_device at91rm9200_uart1_device = { .num_resources = ARRAY_SIZE(uart1_resources), }; -static inline void configure_usart1_pins(void) +static inline void configure_usart1_pins(unsigned pins) { - 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 */ + + if (pins & ATMEL_UART_RI) + at91_set_A_periph(AT91_PIN_PB18, 0); /* RI1 */ + if (pins & ATMEL_UART_DTR) + at91_set_A_periph(AT91_PIN_PB19, 0); /* DTR1 */ + if (pins & ATMEL_UART_DCD) + at91_set_A_periph(AT91_PIN_PB23, 0); /* DCD1 */ + if (pins & ATMEL_UART_CTS) + at91_set_A_periph(AT91_PIN_PB24, 0); /* CTS1 */ + if (pins & ATMEL_UART_DSR) + at91_set_A_periph(AT91_PIN_PB25, 0); /* DSR1 */ + if (pins & ATMEL_UART_RTS) + at91_set_A_periph(AT91_PIN_PB26, 0); /* RTS1 */ } static struct resource uart2_resources[] = { @@ -973,10 +984,15 @@ static struct platform_device at91rm9200_uart2_device = { .num_resources = ARRAY_SIZE(uart2_resources), }; -static inline void configure_usart2_pins(void) +static inline void configure_usart2_pins(unsigned pins) { at91_set_A_periph(AT91_PIN_PA22, 0); /* RXD2 */ at91_set_A_periph(AT91_PIN_PA23, 1); /* TXD2 */ + + if (pins & ATMEL_UART_CTS) + at91_set_B_periph(AT91_PIN_PA30, 0); /* CTS2 */ + if (pins & ATMEL_UART_RTS) + at91_set_B_periph(AT91_PIN_PA31, 0); /* RTS2 */ } static struct resource uart3_resources[] = { @@ -1011,16 +1027,21 @@ static struct platform_device at91rm9200_uart3_device = { .num_resources = ARRAY_SIZE(uart3_resources), }; -static inline void configure_usart3_pins(void) +static inline void configure_usart3_pins(unsigned pins) { at91_set_B_periph(AT91_PIN_PA5, 1); /* TXD3 */ at91_set_B_periph(AT91_PIN_PA6, 0); /* RXD3 */ + + if (pins & ATMEL_UART_CTS) + at91_set_B_periph(AT91_PIN_PB1, 0); /* CTS3 */ + if (pins & ATMEL_UART_RTS) + at91_set_B_periph(AT91_PIN_PB0, 0); /* RTS3 */ } static 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) +void __init __deprecated at91_init_serial(struct at91_uart_config *config) { int i; @@ -1028,22 +1049,22 @@ void __init at91_init_serial(struct at91_uart_config *config) for (i = 0; i < config->nr_tty; i++) { switch (config->tty_map[i]) { case 0: - configure_usart0_pins(); + configure_usart0_pins(ATMEL_UART_CTS | ATMEL_UART_RTS); at91_uarts[i] = &at91rm9200_uart0_device; at91_clock_associate("usart0_clk", &at91rm9200_uart0_device.dev, "usart"); break; case 1: - configure_usart1_pins(); + configure_usart1_pins(ATMEL_UART_CTS | ATMEL_UART_RTS | ATMEL_UART_DSR | ATMEL_UART_DTR | ATMEL_UART_DCD | ATMEL_UART_RI); at91_uarts[i] = &at91rm9200_uart1_device; at91_clock_associate("usart1_clk", &at91rm9200_uart1_device.dev, "usart"); break; case 2: - configure_usart2_pins(); + configure_usart2_pins(0); at91_uarts[i] = &at91rm9200_uart2_device; at91_clock_associate("usart2_clk", &at91rm9200_uart2_device.dev, "usart"); break; case 3: - configure_usart3_pins(); + configure_usart3_pins(0); at91_uarts[i] = &at91rm9200_uart3_device; at91_clock_associate("usart3_clk", &at91rm9200_uart3_device.dev, "usart"); break; @@ -1065,6 +1086,53 @@ void __init at91_init_serial(struct at91_uart_config *config) printk(KERN_INFO "AT91: No default serial console defined.\n"); } +void __init at91_register_uart(unsigned id, unsigned portnr, unsigned pins) +{ + struct platform_device *pdev; + + switch (id) { + case 0: /* DBGU */ + pdev = &at91rm9200_dbgu_device; + configure_dbgu_pins(); + at91_clock_associate("mck", &pdev->dev, "usart"); + break; + case AT91RM9200_ID_US0: + pdev = &at91rm9200_uart0_device; + configure_usart0_pins(pins); + at91_clock_associate("usart0_clk", &pdev->dev, "usart"); + break; + case AT91RM9200_ID_US1: + pdev = &at91rm9200_uart1_device; + configure_usart1_pins(pins); + at91_clock_associate("usart1_clk", &pdev->dev, "usart"); + break; + case AT91RM9200_ID_US2: + pdev = &at91rm9200_uart2_device; + configure_usart2_pins(pins); + at91_clock_associate("usart2_clk", &pdev->dev, "usart"); + break; + case AT91RM9200_ID_US3: + pdev = &at91rm9200_uart3_device; + configure_usart3_pins(pins); + at91_clock_associate("usart3_clk", &pdev->dev, "usart"); + break; + default: + return; + } + pdev->id = portnr; /* update to mapped ID */ + + if (portnr < ATMEL_MAX_UART) + at91_uarts[portnr] = pdev; +} + +void __init at91_set_serial_console(unsigned portnr) +{ + if (portnr < ATMEL_MAX_UART) + atmel_default_console_device = at91_uarts[portnr]; + if (!atmel_default_console_device) + printk(KERN_INFO "AT91: No default serial console defined.\n"); +} + void __init at91_add_device_serial(void) { int i; @@ -1075,7 +1143,9 @@ void __init at91_add_device_serial(void) } } #else -void __init at91_init_serial(struct at91_uart_config *config) {} +void __init __deprecated at91_init_serial(struct at91_uart_config *config) {} +void __init at91_register_uart(unsigned id, unsigned portnr, unsigned pins) {} +void __init at91_set_serial_console(unsigned portnr) {} void __init at91_add_device_serial(void) {} #endif -- cgit v1.2.3