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 <linux/mm.h>
  17 #include <linux/bootmem.h>
  18 #include <asm/pgalloc.h>
  19 #include <asm/machdep.h>
  20 #include <asm/coldfire.h>
  21 #include <asm/m54xxsim.h>
  22 #include <asm/mcfuart.h>
  23 #include <asm/m54xxgpt.h>
  24 #ifdef CONFIG_MMU
  25 #include <asm/mmu_context.h>
  26 #endif
  27
  28 /***************************************************************************/
  29
  30 static struct mcf_platform_uart m54xx_uart_platform[] = {
  31         {
  32                 .mapbase        = MCF_MBAR + MCFUART_BASE1,
  33                 .irq            = 64 + 35,
  34         },
  35         {
  36                 .mapbase        = MCF_MBAR + MCFUART_BASE2,
  37                 .irq            = 64 + 34,
  38         },
  39         {
  40                 .mapbase        = MCF_MBAR + MCFUART_BASE3,
  41                 .irq            = 64 + 33,
  42         },
  43         {
  44                 .mapbase        = MCF_MBAR + MCFUART_BASE4,
  45                 .irq            = 64 + 32,
  46         },
  47 };
  48
  49 static struct platform_device m54xx_uart = {
  50         .name                   = "mcfuart",
  51         .id                     = 0,
  52         .dev.platform_data      = m54xx_uart_platform,
  53 };
  54
  55 static struct platform_device *m54xx_devices[] __initdata = {
  56         &m54xx_uart,
  57 };
  58
  59
  60 /***************************************************************************/
  61
  62 static void __init m54xx_uart_init_line(int line, int irq)
  63 {
  64         int rts_cts;
  65
  66         /* enable io pins */
  67         switch (line) {
  68         case 0:
  69                 rts_cts = 0; break;
  70         case 1:
  71                 rts_cts = MCF_PAR_PSC_RTS_RTS; break;
  72         case 2:
  73                 rts_cts = MCF_PAR_PSC_RTS_RTS | MCF_PAR_PSC_CTS_CTS; break;
  74         case 3:
  75                 rts_cts = 0; break;
  76         }
  77         __raw_writeb(MCF_PAR_PSC_TXD | rts_cts | MCF_PAR_PSC_RXD,
  78                                                 MCF_MBAR + MCF_PAR_PSC(line));
  79 }
  80
  81 static void __init m54xx_uarts_init(void)
  82 {
  83         const int nrlines = ARRAY_SIZE(m54xx_uart_platform);
  84         int line;
  85
  86         for (line = 0; (line < nrlines); line++)
  87                 m54xx_uart_init_line(line, m54xx_uart_platform[line].irq);
  88 }
  89
  90 /***************************************************************************/
  91
  92 static void mcf54xx_reset(void)
  93 {
  94         /* disable interrupts and enable the watchdog */
  95         asm("movew #0x2700, %sr\n");
  96         __raw_writel(0, MCF_MBAR + MCF_GPT_GMS0);
  97         __raw_writel(MCF_GPT_GCIR_CNT(1), MCF_MBAR + MCF_GPT_GCIR0);
  98         __raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),
  99                                                 MCF_MBAR + MCF_GPT_GMS0);
 100 }
 101
 102 /***************************************************************************/
 103
 104 #ifdef CONFIG_MMU
 105
 106 unsigned long num_pages;
 107
 108 static void __init mcf54xx_bootmem_alloc(void)
 109 {
 110         unsigned long start_pfn;
 111         unsigned long memstart;
 112
 113         /* _rambase and _ramend will be naturally page aligned */
 114         m68k_memory[0].addr = _rambase;
 115         m68k_memory[0].size = _ramend - _rambase;
 116
 117         /* compute total pages in system */
 118         num_pages = (_ramend - _rambase) >> PAGE_SHIFT;
 119
 120         /* page numbers */
 121         memstart = PAGE_ALIGN(_ramstart);
 122         min_low_pfn = _rambase >> PAGE_SHIFT;
 123         start_pfn = memstart >> PAGE_SHIFT;
 124         max_low_pfn = _ramend >> PAGE_SHIFT;
 125         high_memory = (void *)_ramend;
 126
 127         m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
 128         module_fixup(NULL, __start_fixup, __stop_fixup);
 129
 130         /* setup bootmem data */
 131         m68k_setup_node(0);
 132         memstart += init_bootmem_node(NODE_DATA(0), start_pfn,
 133                 min_low_pfn, max_low_pfn);
 134         free_bootmem_node(NODE_DATA(0), memstart, _ramend - memstart);
 135 }
 136
 137 #endif /* CONFIG_MMU */
 138
 139 /***************************************************************************/
 140
 141 void __init config_BSP(char *commandp, int size)
 142 {
 143 #ifdef CONFIG_MMU
 144         mcf54xx_bootmem_alloc();
 145         mmu_context_init();
 146 #endif
 147         mach_reset = mcf54xx_reset;
 148         m54xx_uarts_init();
 149 }
 150
 151 /***************************************************************************/
 152
 153 static int __init init_BSP(void)
 154 {
 155
 156         platform_add_devices(m54xx_devices, ARRAY_SIZE(m54xx_devices));
 157         return 0;
 158 }
 159
 160 arch_initcall(init_BSP);
 161
 162 /***************************************************************************/