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- /*
- * 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.
- *
- * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
- */
- #include <linux/io.h>
- #include <linux/serial_reg.h>
- #include <asm/addrspace.h>
- #ifdef CONFIG_SOC_RT288X
- #define EARLY_UART_BASE 0x300c00
- #define CHIPID_BASE 0x300004
- #elif defined(CONFIG_SOC_MT7621)
- #define EARLY_UART_BASE 0x1E000c00
- #define CHIPID_BASE 0x1E000004
- #else
- #define EARLY_UART_BASE 0x10000c00
- #define CHIPID_BASE 0x10000004
- #endif
- #define MT7628_CHIP_NAME1 0x20203832
- #define UART_REG_TX 0x04
- #define UART_REG_LCR 0x0c
- #define UART_REG_LSR 0x14
- #define UART_REG_LSR_RT2880 0x1c
- static __iomem void *uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE);
- static __iomem void *chipid_membase = (__iomem void *) KSEG1ADDR(CHIPID_BASE);
- static int init_complete;
- static inline void uart_w32(u32 val, unsigned reg)
- {
- __raw_writel(val, uart_membase + reg);
- }
- static inline u32 uart_r32(unsigned reg)
- {
- return __raw_readl(uart_membase + reg);
- }
- static inline int soc_is_mt7628(void)
- {
- return IS_ENABLED(CONFIG_SOC_MT7620) &&
- (__raw_readl(chipid_membase) == MT7628_CHIP_NAME1);
- }
- static void find_uart_base(void)
- {
- int i;
- if (!soc_is_mt7628())
- return;
- for (i = 0; i < 3; i++) {
- u32 reg = uart_r32(UART_REG_LCR + (0x100 * i));
- if (!reg)
- continue;
- uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE +
- (0x100 * i));
- break;
- }
- }
- void prom_putchar(unsigned char ch)
- {
- if (!init_complete) {
- find_uart_base();
- init_complete = 1;
- }
- if (IS_ENABLED(CONFIG_SOC_MT7621) || soc_is_mt7628()) {
- uart_w32(ch, UART_TX);
- while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
- ;
- } else {
- while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)
- ;
- uart_w32(ch, UART_REG_TX);
- while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)
- ;
- }
- }
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