1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org> 7 */ 8 9 #include <linux/mm.h> 10 #include <linux/io.h> 11 #include <linux/serial_reg.h> 12 13 #include "devices.h" 14 #include "ar2315_regs.h" 15 #include "ar5312_regs.h" 16 17 static inline void prom_uart_wr(void __iomem *base, unsigned reg, 18 unsigned char ch) 19 { 20 __raw_writel(ch, base + 4 * reg); 21 } 22 23 static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg) 24 { 25 return __raw_readl(base + 4 * reg); 26 } 27 28 void prom_putchar(unsigned char ch) 29 { 30 static void __iomem *base; 31 32 if (unlikely(base == NULL)) { 33 if (is_ar2315()) 34 base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE)); 35 else 36 base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE)); 37 } 38 39 while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0) 40 ; 41 prom_uart_wr(base, UART_TX, ch); 42 while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0) 43 ; 44 } 45