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 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/io.h>
  15
  16 #include <mach/platform.h>
  17 #include <mach/hardware.h>
  18
  19 #include <linux/serial_core.h>
  20 #include <linux/serial_reg.h>
  21
  22 #include <mach/gpio-pnx4008.h>
  23 #include <mach/clock.h>
  24
  25 #define UART_3          0
  26 #define UART_4          1
  27 #define UART_5          2
  28 #define UART_6          3
  29 #define UART_UNKNOWN    (-1)
  30
  31 #define UART3_BASE_VA   IO_ADDRESS(PNX4008_UART3_BASE)
  32 #define UART4_BASE_VA   IO_ADDRESS(PNX4008_UART4_BASE)
  33 #define UART5_BASE_VA   IO_ADDRESS(PNX4008_UART5_BASE)
  34 #define UART6_BASE_VA   IO_ADDRESS(PNX4008_UART6_BASE)
  35
  36 #define UART_FCR_OFFSET         8
  37 #define UART_FIFO_SIZE          64
  38
  39 void pnx4008_uart_init(void)
  40 {
  41         u32 tmp;
  42         int i = UART_FIFO_SIZE;
  43
  44         __raw_writel(0xC1, UART5_BASE_VA + UART_FCR_OFFSET);
  45         __raw_writel(0xC1, UART3_BASE_VA + UART_FCR_OFFSET);
  46
  47         /* Send a NULL to fix the UART HW bug */
  48         __raw_writel(0x00, UART5_BASE_VA);
  49         __raw_writel(0x00, UART3_BASE_VA);
  50
  51         while (i--) {
  52                 tmp = __raw_readl(UART5_BASE_VA);
  53                 tmp = __raw_readl(UART3_BASE_VA);
  54         }
  55         __raw_writel(0, UART5_BASE_VA + UART_FCR_OFFSET);
  56         __raw_writel(0, UART3_BASE_VA + UART_FCR_OFFSET);
  57
  58         /* setup wakeup interrupt */
  59         start_int_set_rising_edge(SE_U3_RX_INT);
  60         start_int_ack(SE_U3_RX_INT);
  61         start_int_umask(SE_U3_RX_INT);
  62
  63         start_int_set_rising_edge(SE_U5_RX_INT);
  64         start_int_ack(SE_U5_RX_INT);
  65         start_int_umask(SE_U5_RX_INT);
  66 }
  67