1 /* 2 * linux/arch/arm/mach-pnx4008/serial.c 3 * 4 * PNX4008 UART initialization 5 * 6 * Copyright: MontaVista Software Inc. (c) 2005 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/types.h> 15 #include <linux/io.h> 16 17 #include <mach/platform.h> 18 #include <mach/hardware.h> 19 20 #include <linux/serial_core.h> 21 #include <linux/serial_reg.h> 22 #include <mach/gpio.h> 23 24 #include <mach/clock.h> 25 26 #define UART_3 0 27 #define UART_4 1 28 #define UART_5 2 29 #define UART_6 3 30 #define UART_UNKNOWN (-1) 31 32 #define UART3_BASE_VA IO_ADDRESS(PNX4008_UART3_BASE) 33 #define UART4_BASE_VA IO_ADDRESS(PNX4008_UART4_BASE) 34 #define UART5_BASE_VA IO_ADDRESS(PNX4008_UART5_BASE) 35 #define UART6_BASE_VA IO_ADDRESS(PNX4008_UART6_BASE) 36 37 #define UART_FCR_OFFSET 8 38 #define UART_FIFO_SIZE 64 39 pnx4008_uart_init(void)40void pnx4008_uart_init(void) 41 { 42 u32 tmp; 43 int i = UART_FIFO_SIZE; 44 45 __raw_writel(0xC1, UART5_BASE_VA + UART_FCR_OFFSET); 46 __raw_writel(0xC1, UART3_BASE_VA + UART_FCR_OFFSET); 47 48 /* Send a NULL to fix the UART HW bug */ 49 __raw_writel(0x00, UART5_BASE_VA); 50 __raw_writel(0x00, UART3_BASE_VA); 51 52 while (i--) { 53 tmp = __raw_readl(UART5_BASE_VA); 54 tmp = __raw_readl(UART3_BASE_VA); 55 } 56 __raw_writel(0, UART5_BASE_VA + UART_FCR_OFFSET); 57 __raw_writel(0, UART3_BASE_VA + UART_FCR_OFFSET); 58 59 /* setup wakeup interrupt */ 60 start_int_set_rising_edge(SE_U3_RX_INT); 61 start_int_ack(SE_U3_RX_INT); 62 start_int_umask(SE_U3_RX_INT); 63 64 start_int_set_rising_edge(SE_U5_RX_INT); 65 start_int_ack(SE_U5_RX_INT); 66 start_int_umask(SE_U5_RX_INT); 67 } 68 69