arch/m68k/platform/54xx/config.c

   1 /***************************************************************************/
   2
   3 /*
   4  *      linux/arch/m68knommu/platform/54xx/config.c
   5  *
   6  *      Copyright (C) 2010, Philippe De Muyter <phdm@macqel.be>
   7  */
   8
   9 /***************************************************************************/
  10
  11 #include <linux/kernel.h>
  12 #include <linux/param.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <asm/machdep.h>
  17 #include <asm/coldfire.h>
  18 #include <asm/m54xxsim.h>
  19 #include <asm/mcfuart.h>
  20 #include <asm/m54xxgpt.h>
  21
  22 /***************************************************************************/
  23
  24 static struct mcf_platform_uart m54xx_uart_platform[] = {
  25         {
  26                 .mapbase        = MCF_MBAR + MCFUART_BASE1,
  27                 .irq            = 64 + 35,
  28         },
  29         {
  30                 .mapbase        = MCF_MBAR + MCFUART_BASE2,
  31                 .irq            = 64 + 34,
  32         },
  33         {
  34                 .mapbase        = MCF_MBAR + MCFUART_BASE3,
  35                 .irq            = 64 + 33,
  36         },
  37         {
  38                 .mapbase        = MCF_MBAR + MCFUART_BASE4,
  39                 .irq            = 64 + 32,
  40         },
  41 };
  42
  43 static struct platform_device m54xx_uart = {
  44         .name                   = "mcfuart",
  45         .id                     = 0,
  46         .dev.platform_data      = m54xx_uart_platform,
  47 };
  48
  49 static struct platform_device *m54xx_devices[] __initdata = {
  50         &m54xx_uart,
  51 };
  52
  53
  54 /***************************************************************************/
  55
  56 static void __init m54xx_uart_init_line(int line, int irq)
  57 {
  58         int rts_cts;
  59
  60         /* enable io pins */
  61         switch (line) {
  62         case 0:
  63                 rts_cts = 0; break;
  64         case 1:
  65                 rts_cts = MCF_PAR_PSC_RTS_RTS; break;
  66         case 2:
  67                 rts_cts = MCF_PAR_PSC_RTS_RTS | MCF_PAR_PSC_CTS_CTS; break;
  68         case 3:
  69                 rts_cts = 0; break;
  70         }
  71         __raw_writeb(MCF_PAR_PSC_TXD | rts_cts | MCF_PAR_PSC_RXD,
  72                                                 MCF_MBAR + MCF_PAR_PSC(line));
  73 }
  74
  75 static void __init m54xx_uarts_init(void)
  76 {
  77         const int nrlines = ARRAY_SIZE(m54xx_uart_platform);
  78         int line;
  79
  80         for (line = 0; (line < nrlines); line++)
  81                 m54xx_uart_init_line(line, m54xx_uart_platform[line].irq);
  82 }
  83
  84 /***************************************************************************/
  85
  86 static void mcf54xx_reset(void)
  87 {
  88         /* disable interrupts and enable the watchdog */
  89         asm("movew #0x2700, %sr\n");
  90         __raw_writel(0, MCF_MBAR + MCF_GPT_GMS0);
  91         __raw_writel(MCF_GPT_GCIR_CNT(1), MCF_MBAR + MCF_GPT_GCIR0);
  92         __raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),
  93                                                 MCF_MBAR + MCF_GPT_GMS0);
  94 }
  95
  96 /***************************************************************************/
  97
  98 void __init config_BSP(char *commandp, int size)
  99 {
 100         mach_reset = mcf54xx_reset;
 101         m54xx_uarts_init();
 102 }
 103
 104 /***************************************************************************/
 105
 106 static int __init init_BSP(void)
 107 {
 108
 109         platform_add_devices(m54xx_devices, ARRAY_SIZE(m54xx_devices));
 110         return 0;
 111 }
 112
 113 arch_initcall(init_BSP);
 114
 115 /***************************************************************************/