[PATCH] AVR32: Allow renumbering of serial devices

Allow the board to remap actual USART peripheral devices to serial
devices by calling at32_map_usart(hw_id, serial_line). This ensures
that even though ATSTK1002 uses USART1 as the first serial port, it
will still have a ttyS0 device.

This also adds a board-specific early setup hook and moves the
at32_setup_serial_console() call there from the platform code.

Signed-off-by: Haavard Skinnemoen <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/avr32/boards/atstk1000/atstk1002.c

···
 #include <linux/init.h>
 
 #include <asm/arch/board.h>
+#include <asm/arch/init.h>
 
 struct eth_platform_data __initdata eth0_data = {
 	.valid		= 1,
···
 
 extern struct lcdc_platform_data atstk1000_fb0_data;
 
+void __init setup_board(void)
+{
+	at32_map_usart(1, 0);	/* /dev/ttyS0 */
+	at32_map_usart(2, 1);	/* /dev/ttyS1 */
+	at32_map_usart(3, 2);	/* /dev/ttyS2 */
+
+	at32_setup_serial_console(0);
+}
+
 static int __init atstk1002_init(void)
 {
 	at32_add_system_devices();
 
-	at32_add_device_usart(1);	/* /dev/ttyS0 */
-	at32_add_device_usart(2);	/* /dev/ttyS1 */
-	at32_add_device_usart(3);	/* /dev/ttyS2 */
+	at32_add_device_usart(0);
+	at32_add_device_usart(1);
+	at32_add_device_usart(2);
 
 	at32_add_device_eth(0, &eth0_data);
 	at32_add_device_spi(0);

arch/avr32/kernel/setup.c

···
 
 	setup_processor();
 	setup_platform();
+	setup_board();
 
 	cpu_clk = clk_get(NULL, "cpu");
 	if (IS_ERR(cpu_clk)) {

arch/avr32/mach-at32ap/at32ap.c

···
 	at32_sm_init();
 	at32_clock_init();
 	at32_portmux_init();
-
-	/* FIXME: This doesn't belong here */
-	at32_setup_serial_console(1);
 }
 
 static int __init pdc_probe(struct platform_device *pdev)

arch/avr32/mach-at32ap/at32ap7000.c

···
 	portmux_set_func(PIOB, 17, FUNC_B);	/* TXD	*/
 }
 
-static struct platform_device *setup_usart(unsigned int id)
+static struct platform_device *at32_usarts[4];
+
+void __init at32_map_usart(unsigned int hw_id, unsigned int line)
 {
 	struct platform_device *pdev;
 
-	switch (id) {
+	switch (hw_id) {
 	case 0:
 		pdev = &atmel_usart0_device;
 		configure_usart0_pins();
···
 		configure_usart3_pins();
 		break;
 	default:
-		return NULL;
+		return;
 	}
 
 	if (PXSEG(pdev->resource[0].start) == P4SEG) {
···
 		data->regs = (void __iomem *)pdev->resource[0].start;
 	}
 
-	return pdev;
+	pdev->id = line;
+	at32_usarts[line] = pdev;
 }
 
 struct platform_device *__init at32_add_device_usart(unsigned int id)
 {
-	struct platform_device *pdev;
-
-	pdev = setup_usart(id);
-	if (pdev)
-		platform_device_register(pdev);
-
-	return pdev;
+	platform_device_register(at32_usarts[id]);
+	return at32_usarts[id];
 }
 
 struct platform_device *atmel_default_console_device;
 
 void __init at32_setup_serial_console(unsigned int usart_id)
 {
-	atmel_default_console_device = setup_usart(usart_id);
+	atmel_default_console_device = at32_usarts[usart_id];
 }
 
 /* --------------------------------------------------------------------

include/asm-avr32/arch-at32ap/board.h

···
 	short		use_dma_rx;	/* use receive DMA? */
 	void __iomem	*regs;		/* virtual base address, if any */
 };
+void at32_map_usart(unsigned int hw_id, unsigned int line);
 struct platform_device *at32_add_device_usart(unsigned int id);
 
 struct eth_platform_data {

include/asm-avr32/arch-at32ap/init.h

···
 #define __ASM_AVR32_AT32AP_INIT_H__
 
 void setup_platform(void);
+void setup_board(void);
 
 /* Called by setup_platform */
 void at32_clock_init(void);