arch/m68k/coldfire/m54xx.c

   1 /***************************************************************************/
   2
   3 /*
   4  *      m54xx.c  -- platform support for ColdFire 54xx based boards
   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/clk.h>
  18 #include <linux/bootmem.h>
  19 #include <asm/pgalloc.h>
  20 #include <asm/machdep.h>
  21 #include <asm/coldfire.h>
  22 #include <asm/m54xxsim.h>
  23 #include <asm/mcfuart.h>
  24 #include <asm/mcfclk.h>
  25 #include <asm/m54xxgpt.h>
  26 #ifdef CONFIG_MMU
  27 #include <asm/mmu_context.h>
  28 #endif
  29
  30 /***************************************************************************/
  31
  32 DEFINE_CLK(pll, "pll.0", MCF_CLK);
  33 DEFINE_CLK(sys, "sys.0", MCF_BUSCLK);
  34 DEFINE_CLK(mcfslt0, "mcfslt.0", MCF_BUSCLK);
  35 DEFINE_CLK(mcfslt1, "mcfslt.1", MCF_BUSCLK);
  36 DEFINE_CLK(mcfuart0, "mcfuart.0", MCF_BUSCLK);
  37 DEFINE_CLK(mcfuart1, "mcfuart.1", MCF_BUSCLK);
  38 DEFINE_CLK(mcfuart2, "mcfuart.2", MCF_BUSCLK);
  39 DEFINE_CLK(mcfuart3, "mcfuart.3", MCF_BUSCLK);
  40
  41 struct clk *mcf_clks[] = {
  42         &clk_pll,
  43         &clk_sys,
  44         &clk_mcfslt0,
  45         &clk_mcfslt1,
  46         &clk_mcfuart0,
  47         &clk_mcfuart1,
  48         &clk_mcfuart2,
  49         &clk_mcfuart3,
  50         NULL
  51 };
  52
  53 /***************************************************************************/
  54
  55 static void __init m54xx_uarts_init(void)
  56 {
  57         /* enable io pins */
  58         __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC0);
  59         __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS,
  60                 MCFGPIO_PAR_PSC1);
  61         __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS |
  62                 MCF_PAR_PSC_CTS_CTS, MCFGPIO_PAR_PSC2);
  63         __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC3);
  64 }
  65
  66 /***************************************************************************/
  67
  68 static void mcf54xx_reset(void)
  69 {
  70         /* disable interrupts and enable the watchdog */
  71         asm("movew #0x2700, %sr\n");
  72         __raw_writel(0, MCF_GPT_GMS0);
  73         __raw_writel(MCF_GPT_GCIR_CNT(1), MCF_GPT_GCIR0);
  74         __raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),
  75                 MCF_GPT_GMS0);
  76 }
  77
  78 /***************************************************************************/
  79
  80 #ifdef CONFIG_MMU
  81
  82 unsigned long num_pages;
  83
  84 static void __init mcf54xx_bootmem_alloc(void)
  85 {
  86         unsigned long start_pfn;
  87         unsigned long memstart;
  88
  89         /* _rambase and _ramend will be naturally page aligned */
  90         m68k_memory[0].addr = _rambase;
  91         m68k_memory[0].size = _ramend - _rambase;
  92
  93         /* compute total pages in system */
  94         num_pages = (_ramend - _rambase) >> PAGE_SHIFT;
  95
  96         /* page numbers */
  97         memstart = PAGE_ALIGN(_ramstart);
  98         min_low_pfn = _rambase >> PAGE_SHIFT;
  99         start_pfn = memstart >> PAGE_SHIFT;
 100         max_low_pfn = _ramend >> PAGE_SHIFT;
 101         high_memory = (void *)_ramend;
 102
 103         m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
 104         module_fixup(NULL, __start_fixup, __stop_fixup);
 105
 106         /* setup bootmem data */
 107         m68k_setup_node(0);
 108         memstart += init_bootmem_node(NODE_DATA(0), start_pfn,
 109                 min_low_pfn, max_low_pfn);
 110         free_bootmem_node(NODE_DATA(0), memstart, _ramend - memstart);
 111 }
 112
 113 #endif /* CONFIG_MMU */
 114
 115 /***************************************************************************/
 116
 117 void __init config_BSP(char *commandp, int size)
 118 {
 119 #ifdef CONFIG_MMU
 120         mcf54xx_bootmem_alloc();
 121         mmu_context_init();
 122 #endif
 123         mach_reset = mcf54xx_reset;
 124         mach_sched_init = hw_timer_init;
 125         m54xx_uarts_init();
 126 }
 127
 128 /***************************************************************************/