arch/arm/mach-pnx4008/serial.c

   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
  16 #include <asm/io.h>
  17
  18 #include <asm/arch/platform.h>
  19 #include <asm/hardware.h>
  20
  21 #include <linux/serial_core.h>
  22 #include <linux/serial_reg.h>
  23 #include <asm/arch/gpio.h>
  24
  25 #include <asm/arch/clock.h>
  26
  27 #define UART_3          0
  28 #define UART_4          1
  29 #define UART_5          2
  30 #define UART_6          3
  31 #define UART_UNKNOWN    (-1)
  32
  33 #define UART3_BASE_VA   IO_ADDRESS(PNX4008_UART3_BASE)
  34 #define UART4_BASE_VA   IO_ADDRESS(PNX4008_UART4_BASE)
  35 #define UART5_BASE_VA   IO_ADDRESS(PNX4008_UART5_BASE)
  36 #define UART6_BASE_VA   IO_ADDRESS(PNX4008_UART6_BASE)
  37
  38 #define UART_FCR_OFFSET         8
  39 #define UART_FIFO_SIZE          64
  40
  41 void pnx4008_uart_init(void)
  42 {
  43         u32 tmp;
  44         int i = UART_FIFO_SIZE;
  45
  46         __raw_writel(0xC1, UART5_BASE_VA + UART_FCR_OFFSET);
  47         __raw_writel(0xC1, UART3_BASE_VA + UART_FCR_OFFSET);
  48
  49         /* Send a NULL to fix the UART HW bug */
  50         __raw_writel(0x00, UART5_BASE_VA);
  51         __raw_writel(0x00, UART3_BASE_VA);
  52
  53         while (i--) {
  54                 tmp = __raw_readl(UART5_BASE_VA);
  55                 tmp = __raw_readl(UART3_BASE_VA);
  56         }
  57         __raw_writel(0, UART5_BASE_VA + UART_FCR_OFFSET);
  58         __raw_writel(0, UART3_BASE_VA + UART_FCR_OFFSET);
  59
  60         /* setup wakeup interrupt */
  61         start_int_set_rising_edge(SE_U3_RX_INT);
  62         start_int_ack(SE_U3_RX_INT);
  63         start_int_umask(SE_U3_RX_INT);
  64
  65         start_int_set_rising_edge(SE_U5_RX_INT);
  66         start_int_ack(SE_U5_RX_INT);
  67         start_int_umask(SE_U5_RX_INT);
  68 }
  69