ar71xx: update early_printk code
authorGabor Juhos <juhosg@openwrt.org>
Mon, 13 Jun 2011 08:12:38 +0000 (08:12 +0000)
committerGabor Juhos <juhosg@openwrt.org>
Mon, 13 Jun 2011 08:12:38 +0000 (08:12 +0000)
SVN-Revision: 27165

target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c
target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar933x_uart.h [new file with mode: 0644]

index f84c76d..c85a04d 100644 (file)
 #include <asm/addrspace.h>
 
 #include <asm/mach-ar71xx/ar71xx.h>
+#include <asm/mach-ar71xx/ar933x_uart.h>
 
-static void __iomem *prom_uart_base;
-static void (*_putchar)(unsigned char);
+static void (*_prom_putchar) (unsigned char);
 
-#define UART_READ(r) \
-       __raw_readl(prom_uart_base + 4 * (r))
+static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val)
+{
+       u32 t;
 
-#define UART_WRITE(r, v) \
-       __raw_writel((v), prom_uart_base + 4 * (r))
+       do {
+               t = __raw_readl(reg);
+               if ((t & mask) == val)
+                       break;
+       } while (1);
+}
 
 static void prom_putchar_ar71xx(unsigned char ch)
 {
-       while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0)
-               ;
-       UART_WRITE(UART_TX, ch);
-       while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0)
-               ;
+       void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
+
+       prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE);
+       __raw_writel(ch, base + UART_TX * 4);
+       prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE);
 }
 
 static void prom_putchar_ar933x(unsigned char ch)
 {
-       while (((UART_READ(0)) & 0x200) == 0)
-               ;
-       UART_WRITE(0, 0x200 | ch);
-       while (((UART_READ(0)) & 0x200) == 0)
-               ;
+       void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE));
+
+       prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
+                         AR933X_UART_DATA_TX_CSR);
+       __raw_writel(AR933X_UART_DATA_TX_CSR | ch, base + AR933X_UART_DATA_REG);
+       prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
+                         AR933X_UART_DATA_TX_CSR);
 }
 
-static int prom_putchar_init(void)
+static void prom_putchar_dummy(unsigned char ch)
 {
-       if (_putchar)
-               return 0;
-
-       switch(ar71xx_soc) {
-       case AR71XX_SOC_AR7130:
-       case AR71XX_SOC_AR7141:
-       case AR71XX_SOC_AR7161:
-       case AR71XX_SOC_AR7240:
-       case AR71XX_SOC_AR7241:
-       case AR71XX_SOC_AR7242:
-       case AR71XX_SOC_AR9130:
-       case AR71XX_SOC_AR9132:
-       case AR71XX_SOC_AR9341:
-       case AR71XX_SOC_AR9342:
-       case AR71XX_SOC_AR9344:
-               prom_uart_base = (void __iomem *) KSEG1ADDR(AR71XX_UART_BASE);
-               _putchar = prom_putchar_ar71xx;
+       /* nothing to do */
+}
+
+static void prom_putchar_init(void)
+{
+       void __iomem *base;
+       u32 id;
+
+       base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE));
+       id = __raw_readl(base + AR71XX_RESET_REG_REV_ID);
+       id &= REV_ID_MAJOR_MASK;
+
+       switch (id) {
+       case REV_ID_MAJOR_AR71XX:
+       case REV_ID_MAJOR_AR7240:
+       case REV_ID_MAJOR_AR7241:
+       case REV_ID_MAJOR_AR7242:
+       case REV_ID_MAJOR_AR913X:
+       case REV_ID_MAJOR_AR9341:
+       case REV_ID_MAJOR_AR9342:
+       case REV_ID_MAJOR_AR9344:
+               _prom_putchar = prom_putchar_ar71xx;
                break;
 
-       case AR71XX_SOC_AR9330:
-       case AR71XX_SOC_AR9331:
-               prom_uart_base = (void __iomem *) KSEG1ADDR(AR933X_UART_BASE);
-               _putchar = prom_putchar_ar933x;
+       case REV_ID_MAJOR_AR9330:
+       case REV_ID_MAJOR_AR9331:
+               _prom_putchar = prom_putchar_ar933x;
                break;
 
        default:
-               return -ENODEV;
+               _prom_putchar = prom_putchar_dummy;
+               break;
        }
-
-       return 0;
 }
 
 void prom_putchar(unsigned char ch)
 {
-       if (prom_putchar_init())
-               return;
+       if (!_prom_putchar)
+               prom_putchar_init();
 
-       _putchar(ch);
+       _prom_putchar(ch);
 }
diff --git a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar933x_uart.h b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar933x_uart.h
new file mode 100644 (file)
index 0000000..edb13cd
--- /dev/null
@@ -0,0 +1,58 @@
+/*
+ *  Atheros AR933X UART defines
+ *
+ *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#ifndef __AR933X_UART_H
+#define __AR933X_UART_H
+
+#define AR933X_UART_DATA_REG           0x00
+#define AR933X_UART_CS_REG             0x04
+#define AR933X_UART_CLOCK_REG          0x08
+#define AR933X_UART_INT_REG            0x0c
+#define AR933X_UART_INT_EN_REG         0x10
+
+#define AR933X_UART_DATA_TX_RX_MASK    0xff
+#define AR933X_UART_DATA_RX_CSR                BIT(8)
+#define AR933X_UART_DATA_TX_CSR                BIT(9)
+
+#define AR933X_UART_CS_PARITY_S                0
+#define AR933X_UART_CS_PARITY_M                0x3
+#define AR933X_UART_CS_PARITY_M                0x3
+#define AR933X_UART_CS_IF_MODE_S       2
+#define AR933X_UART_CS_IF_MODE_M       0x3
+#define AR933X_UART_CS_FLOW_CTRL_S     4
+#define AR933X_UART_CS_FLOW_CTRL_M     0x3
+#define AR933X_UART_CS_DMA_EN          BIT(6)
+#define AR933X_UART_CS_TX_READY_ORIDE  BIT(7)
+#define AR933X_UART_CS_RX_READY_ORIDE  BIT(8)
+#define AR933X_UART_CS_TX_READY                BIT(9)
+#define AR933X_UART_CS_RX_BREAK                BIT(10)
+#define AR933X_UART_CS_TX_BREAK                BIT(11)
+#define AR933X_UART_CS_HOST_INT                BIT(12)
+#define AR933X_UART_CS_HOST_INT_EN     BIT(13)
+#define AR933X_UART_CS_TX_BUSY         BIT(14)
+#define AR933X_UART_CS_RX_BUSY         BIT(15)
+
+#define AR933X_UART_CLOCK_STEP_M       0xffff
+#define AR933X_UART_CLOCK_SCALE_M      0xfff
+#define AR933X_UART_CLCOK_SCALE_S      16
+
+#define AR933X_UART_INT_RX_VALID       BIT(0)
+#define AR933X_UART_INT_TX_READY       BIT(1)
+#define AR933X_UART_INT_RX_FRAMING_ERR BIT(2)
+#define AR933X_UART_INT_RX_OFLOW_ERR   BIT(3)
+#define AR933X_UART_INT_TX_OFLOW_ERR   BIT(4)
+#define AR933X_UART_INT_RX_PARITY_ERR  BIT(5)
+#define AR933X_UART_INT_RX_BREAK_ON    BIT(6)
+#define AR933X_UART_INT_RX_BREAK_OFF   BIT(7)
+#define AR933X_UART_INT_RX_FULL                BIT(8)
+#define AR933X_UART_INT_TX_EMPTY       BIT(9)
+#define AR933X_UART_INT_ALLINTS                0x3ff
+
+#endif /* __AR933X_UART_H */