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146 lines
3.2 KiB
146 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* Copyright (C) 2008 Imre Kaloz <[email protected]> |
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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/setup.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)(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(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((unsigned char)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(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 | (unsigned char)ch, |
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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(char ch) |
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{ |
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/* nothing to do */ |
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} |
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static void prom_enable_uart(u32 id) |
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{ |
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void __iomem *gpio_base; |
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u32 uart_en; |
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u32 t; |
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switch (id) { |
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case REV_ID_MAJOR_AR71XX: |
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uart_en = AR71XX_GPIO_FUNC_UART_EN; |
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break; |
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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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uart_en = AR724X_GPIO_FUNC_UART_EN; |
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break; |
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case REV_ID_MAJOR_AR913X: |
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uart_en = AR913X_GPIO_FUNC_UART_EN; |
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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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uart_en = AR933X_GPIO_FUNC_UART_EN; |
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break; |
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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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/* TODO */ |
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default: |
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return; |
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} |
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gpio_base = (void __iomem *)KSEG1ADDR(AR71XX_GPIO_BASE); |
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t = __raw_readl(gpio_base + AR71XX_GPIO_REG_FUNC); |
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t |= uart_en; |
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__raw_writel(t, gpio_base + AR71XX_GPIO_REG_FUNC); |
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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_QCA9533: |
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case REV_ID_MAJOR_QCA9533_V2: |
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case REV_ID_MAJOR_QCA9556: |
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case REV_ID_MAJOR_QCA9558: |
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case REV_ID_MAJOR_TP9343: |
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case REV_ID_MAJOR_QCA956X: |
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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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return; |
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} |
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prom_enable_uart(id); |
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} |
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void prom_putchar(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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