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101 lines
2.4 KiB
101 lines
2.4 KiB
/* |
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* Atheros AR7XXX/AR9XXX SoC early printk support |
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* |
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* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org> |
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 as published |
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* by the Free Software Foundation. |
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*/ |
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#include <linux/io.h> |
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#include <linux/errno.h> |
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#include <linux/serial_reg.h> |
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#include <asm/addrspace.h> |
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#include <asm/mach-ath79/ath79.h> |
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#include <asm/mach-ath79/ar71xx_regs.h> |
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#include <asm/mach-ath79/ar933x_uart.h> |
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static void (*_prom_putchar) (unsigned char); |
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static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val) |
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{ |
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u32 t; |
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do { |
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t = __raw_readl(reg); |
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if ((t & mask) == val) |
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break; |
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} while (1); |
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} |
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#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) |
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static void prom_putchar_ar71xx(unsigned char ch) |
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{ |
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void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE)); |
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prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY); |
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__raw_writel(ch, base + UART_TX * 4); |
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prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY); |
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} |
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static void prom_putchar_ar933x(unsigned char ch) |
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{ |
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void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE)); |
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prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR, |
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AR933X_UART_DATA_TX_CSR); |
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__raw_writel(AR933X_UART_DATA_TX_CSR | ch, base + AR933X_UART_DATA_REG); |
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prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR, |
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AR933X_UART_DATA_TX_CSR); |
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} |
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static void prom_putchar_dummy(unsigned char ch) |
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{ |
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/* nothing to do */ |
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} |
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static void prom_putchar_init(void) |
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{ |
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void __iomem *base; |
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u32 id; |
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base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE)); |
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id = __raw_readl(base + AR71XX_RESET_REG_REV_ID); |
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id &= REV_ID_MAJOR_MASK; |
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switch (id) { |
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case REV_ID_MAJOR_AR71XX: |
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case REV_ID_MAJOR_AR7240: |
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case REV_ID_MAJOR_AR7241: |
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case REV_ID_MAJOR_AR7242: |
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case REV_ID_MAJOR_AR913X: |
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case REV_ID_MAJOR_AR9341: |
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case REV_ID_MAJOR_AR9342: |
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case REV_ID_MAJOR_AR9344: |
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case REV_ID_MAJOR_QCA9556: |
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case REV_ID_MAJOR_QCA9558: |
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_prom_putchar = prom_putchar_ar71xx; |
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break; |
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case REV_ID_MAJOR_AR9330: |
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case REV_ID_MAJOR_AR9331: |
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_prom_putchar = prom_putchar_ar933x; |
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break; |
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default: |
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_prom_putchar = prom_putchar_dummy; |
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break; |
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} |
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} |
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void prom_putchar(unsigned char ch) |
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{ |
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if (!_prom_putchar) |
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prom_putchar_init(); |
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_prom_putchar(ch); |
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}
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