[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 <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 67 insertions, 10 deletions

diff --git a/arch/arm/mach-at91/at91sam9261_devices.c b/arch/arm/mach-at91/at91sam9261_devices.c
index ba84ba6f18fb..467a6431d71a 100644
--- a/arch/arm/mach-at91/at91sam9261_devices.c
+++ b/arch/arm/mach-at91/at91sam9261_devices.c
@@ -867,12 +867,15 @@ static struct platform_device at91sam9261_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_PC8, 1);             /* TXD0 */
         at91_set_A_periph(AT91_PIN_PC9, 0);             /* RXD0 */
-        at91_set_A_periph(AT91_PIN_PC10, 0);            /* RTS0 */
-        at91_set_A_periph(AT91_PIN_PC11, 0);            /* CTS0 */
+
+        if (pins & ATMEL_UART_RTS)
+                at91_set_A_periph(AT91_PIN_PC10, 0);    /* RTS0 */
+        if (pins & ATMEL_UART_CTS)
+                at91_set_A_periph(AT91_PIN_PC11, 0);    /* CTS0 */
 }
 
 static struct resource uart1_resources[] = {
@@ -907,10 +910,15 @@ static struct platform_device at91sam9261_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_PC12, 1);            /* TXD1 */
         at91_set_A_periph(AT91_PIN_PC13, 0);            /* RXD1 */
+
+        if (pins & ATMEL_UART_RTS)
+                at91_set_B_periph(AT91_PIN_PA12, 0);    /* RTS1 */
+        if (pins & ATMEL_UART_CTS)
+                at91_set_B_periph(AT91_PIN_PA13, 0);    /* CTS1 */
 }
 
 static struct resource uart2_resources[] = {
@@ -945,16 +953,21 @@ static struct platform_device at91sam9261_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_PC15, 0);            /* RXD2 */
         at91_set_A_periph(AT91_PIN_PC14, 1);            /* TXD2 */
+
+        if (pins & ATMEL_UART_RTS)
+                at91_set_B_periph(AT91_PIN_PA15, 0);    /* RTS2*/
+        if (pins & ATMEL_UART_CTS)
+                at91_set_B_periph(AT91_PIN_PA16, 0);    /* CTS2 */
 }
 
 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;
 
@@ -962,17 +975,17 @@ 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] = &at91sam9261_uart0_device;
                                 at91_clock_associate("usart0_clk", &at91sam9261_uart0_device.dev, "usart");
                                 break;
                         case 1:
-                                configure_usart1_pins();
+                                configure_usart1_pins(0);
                                 at91_uarts[i] = &at91sam9261_uart1_device;
                                 at91_clock_associate("usart1_clk", &at91sam9261_uart1_device.dev, "usart");
                                 break;
                         case 2:
-                                configure_usart2_pins();
+                                configure_usart2_pins(0);
                                 at91_uarts[i] = &at91sam9261_uart2_device;
                                 at91_clock_associate("usart2_clk", &at91sam9261_uart2_device.dev, "usart");
                                 break;
@@ -994,6 +1007,48 @@ 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 = &at91sam9261_dbgu_device;
+                        configure_dbgu_pins();
+                        at91_clock_associate("mck", &pdev->dev, "usart");
+                        break;
+                case AT91SAM9261_ID_US0:
+                        pdev = &at91sam9261_uart0_device;
+                        configure_usart0_pins(pins);
+                        at91_clock_associate("usart0_clk", &pdev->dev, "usart");
+                        break;
+                case AT91SAM9261_ID_US1:
+                        pdev = &at91sam9261_uart1_device;
+                        configure_usart1_pins(pins);
+                        at91_clock_associate("usart1_clk", &pdev->dev, "usart");
+                        break;
+                case AT91SAM9261_ID_US2:
+                        pdev = &at91sam9261_uart2_device;
+                        configure_usart2_pins(pins);
+                        at91_clock_associate("usart2_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;
@@ -1004,7 +1059,9 @@ 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