2 * Atheros AR7xxx/AR9xxx SoC early printk support
4 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
12 #include <linux/errno.h>
14 #include <linux/serial_reg.h>
15 #include <asm/addrspace.h>
17 #include <asm/mach-ar71xx/ar71xx.h>
18 #include <asm/mach-ar71xx/ar933x_uart.h>
20 static void (*_prom_putchar) (unsigned char);
22 static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val)
28 if ((t & mask) == val)
33 static void prom_putchar_ar71xx(unsigned char ch)
35 void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
37 prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE);
38 __raw_writel(ch, base + UART_TX * 4);
39 prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE);
42 static void prom_putchar_ar933x(unsigned char ch)
44 void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE));
46 prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
47 AR933X_UART_DATA_TX_CSR);
48 __raw_writel(AR933X_UART_DATA_TX_CSR | ch, base + AR933X_UART_DATA_REG);
49 prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
50 AR933X_UART_DATA_TX_CSR);
53 static void prom_putchar_dummy(unsigned char ch)
58 static void prom_putchar_init(void)
63 base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE));
64 id = __raw_readl(base + AR71XX_RESET_REG_REV_ID);
65 id &= REV_ID_MAJOR_MASK;
68 case REV_ID_MAJOR_AR71XX:
69 case REV_ID_MAJOR_AR7240:
70 case REV_ID_MAJOR_AR7241:
71 case REV_ID_MAJOR_AR7242:
72 case REV_ID_MAJOR_AR913X:
73 case REV_ID_MAJOR_AR9341:
74 case REV_ID_MAJOR_AR9342:
75 case REV_ID_MAJOR_AR9344:
76 _prom_putchar = prom_putchar_ar71xx;
79 case REV_ID_MAJOR_AR9330:
80 case REV_ID_MAJOR_AR9331:
81 _prom_putchar = prom_putchar_ar933x;
85 _prom_putchar = prom_putchar_dummy;
90 void prom_putchar(unsigned char ch)