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Linux/arch/mips/ath79/early_printk.c

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  1 /*
  2  *  Atheros AR7XXX/AR9XXX SoC early printk support
  3  *
  4  *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
  5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  6  *
  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.
 10  */
 11 
 12 #include <linux/io.h>
 13 #include <linux/errno.h>
 14 #include <linux/serial_reg.h>
 15 #include <asm/addrspace.h>
 16 
 17 #include <asm/mach-ath79/ath79.h>
 18 #include <asm/mach-ath79/ar71xx_regs.h>
 19 #include <asm/mach-ath79/ar933x_uart.h>
 20 
 21 static void (*_prom_putchar) (unsigned char);
 22 
 23 static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val)
 24 {
 25         u32 t;
 26 
 27         do {
 28                 t = __raw_readl(reg);
 29                 if ((t & mask) == val)
 30                         break;
 31         } while (1);
 32 }
 33 
 34 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
 35 
 36 static void prom_putchar_ar71xx(unsigned char ch)
 37 {
 38         void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
 39 
 40         prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY);
 41         __raw_writel(ch, base + UART_TX * 4);
 42         prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY);
 43 }
 44 
 45 static void prom_putchar_ar933x(unsigned char ch)
 46 {
 47         void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE));
 48 
 49         prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
 50                           AR933X_UART_DATA_TX_CSR);
 51         __raw_writel(AR933X_UART_DATA_TX_CSR | ch, base + AR933X_UART_DATA_REG);
 52         prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
 53                           AR933X_UART_DATA_TX_CSR);
 54 }
 55 
 56 static void prom_putchar_dummy(unsigned char ch)
 57 {
 58         /* nothing to do */
 59 }
 60 
 61 static void prom_putchar_init(void)
 62 {
 63         void __iomem *base;
 64         u32 id;
 65 
 66         base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE));
 67         id = __raw_readl(base + AR71XX_RESET_REG_REV_ID);
 68         id &= REV_ID_MAJOR_MASK;
 69 
 70         switch (id) {
 71         case REV_ID_MAJOR_AR71XX:
 72         case REV_ID_MAJOR_AR7240:
 73         case REV_ID_MAJOR_AR7241:
 74         case REV_ID_MAJOR_AR7242:
 75         case REV_ID_MAJOR_AR913X:
 76         case REV_ID_MAJOR_AR9341:
 77         case REV_ID_MAJOR_AR9342:
 78         case REV_ID_MAJOR_AR9344:
 79         case REV_ID_MAJOR_QCA9556:
 80         case REV_ID_MAJOR_QCA9558:
 81                 _prom_putchar = prom_putchar_ar71xx;
 82                 break;
 83 
 84         case REV_ID_MAJOR_AR9330:
 85         case REV_ID_MAJOR_AR9331:
 86                 _prom_putchar = prom_putchar_ar933x;
 87                 break;
 88 
 89         default:
 90                 _prom_putchar = prom_putchar_dummy;
 91                 break;
 92         }
 93 }
 94 
 95 void prom_putchar(unsigned char ch)
 96 {
 97         if (!_prom_putchar)
 98                 prom_putchar_init();
 99 
100         _prom_putchar(ch);
101 }
102 

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