[adm8668] implement early_printk without an early_console

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34547 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/adm8668/config-3.3

@@ -5,6 +5,9 @@ CONFIG_ARCH_HIBERNATION_POSSIBLE=y
 CONFIG_ARCH_SUSPEND_POSSIBLE=y
 CONFIG_CEVT_R4K=y
 CONFIG_CEVT_R4K_LIB=y
+CONFIG_CMDLINE="console=ttyS0 earlyprintk"
+CONFIG_CMDLINE_BOOL=y
+CONFIG_CMDLINE_OVERRIDE=y
 CONFIG_CPU_HAS_PREFETCH=y
 CONFIG_CPU_HAS_SYNC=y
 CONFIG_CPU_LITTLE_ENDIAN=y
@@ -17,6 +20,7 @@ CONFIG_CSRC_R4K=y
 CONFIG_CSRC_R4K_LIB=y
 CONFIG_DECOMPRESS_LZMA=y
 CONFIG_DMA_NONCOHERENT=y
+CONFIG_EARLY_PRINTK=y
 CONFIG_EEPROM_93CX6=m
 CONFIG_GENERIC_ATOMIC64=y
 CONFIG_GENERIC_CLOCKEVENTS=y
@@ -69,6 +73,7 @@ CONFIG_SERIAL_ADM8668=y
 CONFIG_SERIAL_ADM8668_CONSOLE=y
 CONFIG_SWAP_IO_SPACE=y
 CONFIG_SYS_HAS_CPU_MIPS32_R1=y
+CONFIG_SYS_HAS_EARLY_PRINTK=y
 CONFIG_SYS_SUPPORTS_32BIT_KERNEL=y
 CONFIG_SYS_SUPPORTS_ARBIT_HZ=y
 CONFIG_SYS_SUPPORTS_LITTLE_ENDIAN=y

target/linux/adm8668/files/arch/mips/adm8668/Makefile

@@ -3,5 +3,5 @@
 #
 
 obj-y	 	:= irq.o pci.o prom.o platform.o serial.o proc.o \
-		   setup.o time.o \
+		   setup.o time.o early_printk.o \
 		   net_core.o net_intr.o

target/linux/adm8668/files/arch/mips/adm8668/early_printk.c

@@ -0,0 +1,16 @@
+#include <linux/io.h>
+#include <linux/serial_core.h>
+#include <adm8668.h>
+
+#define UART_READ(r) \
+	__raw_readl((void __iomem *)(KSEG1ADDR(ADM8668_UART0_BASE) + (r)))
+
+#define UART_WRITE(v, r) \
+	__raw_writel((v), (void __iomem *)(KSEG1ADDR(ADM8668_UART0_BASE) + (r)))
+
+void prom_putchar(char c)
+{
+	UART_WRITE(c, UART_DR_REG);
+	while ((UART_READ(UART_FR_REG) & UART_TX_FIFO_FULL) != 0)
+		;
+}

target/linux/adm8668/files/arch/mips/adm8668/prom.c

@@ -25,44 +25,6 @@
 
 register volatile struct global_data *gd asm ("k0");
 
-#ifdef CONFIG_SERIAL_ADM8668_CONSOLE
-static inline unsigned int adm_uart_readl(unsigned int offset)
-{
-	return (*(volatile unsigned int *)(0xbe400000 + offset));
-}
-
-static inline void adm_uart_writel(unsigned int value, unsigned int offset)
-{
-	(*((volatile unsigned int *)(0xbe400000 + offset))) = value;
-}
-
-static void prom_putchar(char c)
-{
-	adm_uart_writel(c, UART_DR_REG);
-	while ((adm_uart_readl(UART_FR_REG) & UART_TX_FIFO_FULL) != 0)
-		;
-}
-
-static void __init
-early_console_write(struct console *con, const char *s, unsigned n)
-{
-	while (n-- && *s) {
-		if (*s == '\n')
-			prom_putchar('\r');
-		prom_putchar(*s);
-		s++;
-	}
-}
-
-static struct console early_console __initdata = {
-	.name	= "early",
-	.write	= early_console_write,
-	.flags	= CON_BOOT,
-	.index	= -1
-};
-
-#endif
-
 void __init prom_free_prom_memory(void)
 {
 	/* No prom memory to free */
@@ -122,10 +84,6 @@ void __init prom_init(void)
 	bd_t *bd = gd->bd;
 	int memsize;
 
-#ifdef CONFIG_SERIAL_ADM8668_CONSOLE
-	register_console(&early_console);
-#endif
-
 	memsize = bd->bi_memsize;
 	printk("Board info:\n");
 	printk("  RAM size: %d MB\n", (int)memsize/(1024*1024));

target/linux/adm8668/patches-3.3/001-adm8668_arch.patch

@@ -10,7 +10,7 @@
  include $(patsubst %, $(srctree)/arch/mips/%/Platform, $(platforms))
 --- a/arch/mips/Kconfig
 +++ b/arch/mips/Kconfig
-@@ -105,6 +105,26 @@ config BCM47XX
+@@ -105,6 +105,27 @@ config BCM47XX
  	help
  	 Support for BCM47XX based boards
  
@@ -30,6 +30,7 @@
 +	select SWAP_IO_SPACE
 +	select SERIAL_ADM8668
 +	select SERIAL_ADM8668_CONSOLE
++	select SYS_HAS_EARLY_PRINTK
 +	help
 +		ADM8668 board support by neutronscott
 +		Scott Nicholas <neutronscott@scottn.us>