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[ARM] 4757/1: [AT91] UART initialization

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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 <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrew Victor
2008-01-23 09:25:15 +01:00
committed by Russell King
parent b7b272a882
commit c8f385a631
6 changed files with 420 additions and 76 deletions
Download Patch File Download Diff File Expand all files Collapse all files

99
arch/arm/mach-at91/at91sam9rl_devices.c
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@@ -676,12 +676,23 @@ static struct platform_device at91sam9rl_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_PA6, 1); /* TXD0 */
at91_set_A_periph(AT91_PIN_PA7, 0); /* RXD0 */
at91_set_A_periph(AT91_PIN_PA9, 0); /* RTS0 */
at91_set_A_periph(AT91_PIN_PA10, 0); /* CTS0 */
if (pins & ATMEL_UART_RTS)
at91_set_A_periph(AT91_PIN_PA9, 0); /* RTS0 */
if (pins & ATMEL_UART_CTS)
at91_set_A_periph(AT91_PIN_PA10, 0); /* CTS0 */
if (pins & ATMEL_UART_DSR)
at91_set_A_periph(AT91_PIN_PD14, 0); /* DSR0 */
if (pins & ATMEL_UART_DTR)
at91_set_A_periph(AT91_PIN_PD15, 0); /* DTR0 */
if (pins & ATMEL_UART_DCD)
at91_set_A_periph(AT91_PIN_PD16, 0); /* DCD0 */
if (pins & ATMEL_UART_RI)
at91_set_A_periph(AT91_PIN_PD17, 0); /* RI0 */
}
static struct resource uart1_resources[] = {
@@ -716,10 +727,15 @@ static struct platform_device at91sam9rl_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_PA11, 1); /* TXD1 */
at91_set_A_periph(AT91_PIN_PA12, 0); /* RXD1 */
if (pins & ATMEL_UART_RTS)
at91_set_B_periph(AT91_PIN_PA18, 0); /* RTS1 */
if (pins & ATMEL_UART_CTS)
at91_set_B_periph(AT91_PIN_PA19, 0); /* CTS1 */
}
static struct resource uart2_resources[] = {
@@ -754,10 +770,15 @@ static struct platform_device at91sam9rl_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_PA13, 1); /* TXD2 */
at91_set_A_periph(AT91_PIN_PA14, 0); /* RXD2 */
if (pins & ATMEL_UART_RTS)
at91_set_A_periph(AT91_PIN_PA29, 0); /* RTS2 */
if (pins & ATMEL_UART_CTS)
at91_set_A_periph(AT91_PIN_PA30, 0); /* CTS2 */
}
static struct resource uart3_resources[] = {
@@ -792,16 +813,21 @@ static struct platform_device at91sam9rl_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_A_periph(AT91_PIN_PB0, 1); /* TXD3 */
at91_set_A_periph(AT91_PIN_PB1, 0); /* RXD3 */
if (pins & ATMEL_UART_RTS)
at91_set_B_periph(AT91_PIN_PD4, 0); /* RTS3 */
if (pins & ATMEL_UART_CTS)
at91_set_B_periph(AT91_PIN_PD3, 0); /* CTS3 */
}
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;
@@ -809,22 +835,22 @@ 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] = &at91sam9rl_uart0_device;
at91_clock_associate("usart0_clk", &at91sam9rl_uart0_device.dev, "usart");
break;
case 1:
configure_usart1_pins();
configure_usart1_pins(0);
at91_uarts[i] = &at91sam9rl_uart1_device;
at91_clock_associate("usart1_clk", &at91sam9rl_uart1_device.dev, "usart");
break;
case 2:
configure_usart2_pins();
configure_usart2_pins(0);
at91_uarts[i] = &at91sam9rl_uart2_device;
at91_clock_associate("usart2_clk", &at91sam9rl_uart2_device.dev, "usart");
break;
case 3:
configure_usart3_pins();
configure_usart3_pins(0);
at91_uarts[i] = &at91sam9rl_uart3_device;
at91_clock_associate("usart3_clk", &at91sam9rl_uart3_device.dev, "usart");
break;
@@ -846,6 +872,53 @@ 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 = &at91sam9rl_dbgu_device;
configure_dbgu_pins();
at91_clock_associate("mck", &pdev->dev, "usart");
break;
case AT91SAM9RL_ID_US0:
pdev = &at91sam9rl_uart0_device;
configure_usart0_pins(pins);
at91_clock_associate("usart0_clk", &pdev->dev, "usart");
break;
case AT91SAM9RL_ID_US1:
pdev = &at91sam9rl_uart1_device;
configure_usart1_pins(pins);
at91_clock_associate("usart1_clk", &pdev->dev, "usart");
break;
case AT91SAM9RL_ID_US2:
pdev = &at91sam9rl_uart2_device;
configure_usart2_pins(pins);
at91_clock_associate("usart2_clk", &pdev->dev, "usart");
break;
case AT91SAM9RL_ID_US3:
pdev = &at91sam9rl_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;
@@ -856,7 +929,9 @@ 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