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-rw-r--r--target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c98
-rw-r--r--target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar933x_uart.h58
2 files changed, 112 insertions, 44 deletions
diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c b/target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c
index f84c76d753..c85a04d2c1 100644
--- a/target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c
+++ b/target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c
@@ -15,72 +15,82 @@
#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
index 0000000000..edb13cd014
--- /dev/null
+++ b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar933x_uart.h
@@ -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 */