LXR linux/arch/m68k/platform/coldfire/m54xx.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/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#include <asm/mcfclk.h>
  27#ifdef CONFIG_MMU
  28#include <asm/mmu_context.h>
  29#endif
  30
  31/***************************************************************************/
  32
  33DEFINE_CLK(pll, "pll.0", MCF_CLK);
  34DEFINE_CLK(sys, "sys.0", MCF_BUSCLK);
  35DEFINE_CLK(mcfslt0, "mcfslt.0", MCF_BUSCLK);
  36DEFINE_CLK(mcfslt1, "mcfslt.1", MCF_BUSCLK);
  37DEFINE_CLK(mcfuart0, "mcfuart.0", MCF_BUSCLK);
  38DEFINE_CLK(mcfuart1, "mcfuart.1", MCF_BUSCLK);
  39DEFINE_CLK(mcfuart2, "mcfuart.2", MCF_BUSCLK);
  40DEFINE_CLK(mcfuart3, "mcfuart.3", MCF_BUSCLK);
  41
  42struct clk *mcf_clks[] = {
  43        &clk_pll,
  44        &clk_sys,
  45        &clk_mcfslt0,
  46        &clk_mcfslt1,
  47        &clk_mcfuart0,
  48        &clk_mcfuart1,
  49        &clk_mcfuart2,
  50        &clk_mcfuart3,
  51        NULL
  52};
  53
  54/***************************************************************************/
  55
  56static void __init m54xx_uarts_init(void)
  57{
  58        /* enable io pins */
  59        __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC0);
  60        __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS,
  61                MCFGPIO_PAR_PSC1);
  62        __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS |
  63                MCF_PAR_PSC_CTS_CTS, MCFGPIO_PAR_PSC2);
  64        __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC3);
  65}
  66
  67/***************************************************************************/
  68
  69static void mcf54xx_reset(void)
  70{
  71        /* disable interrupts and enable the watchdog */
  72        asm("movew #0x2700, %sr\n");
  73        __raw_writel(0, MCF_GPT_GMS0);
  74        __raw_writel(MCF_GPT_GCIR_CNT(1), MCF_GPT_GCIR0);
  75        __raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),
  76                MCF_GPT_GMS0);
  77}
  78
  79/***************************************************************************/
  80
  81#ifdef CONFIG_MMU
  82
  83unsigned long num_pages;
  84
  85static void __init mcf54xx_bootmem_alloc(void)
  86{
  87        unsigned long start_pfn;
  88        unsigned long memstart;
  89
  90        /* _rambase and _ramend will be naturally page aligned */
  91        m68k_memory[0].addr = _rambase;
  92        m68k_memory[0].size = _ramend - _rambase;
  93
  94        /* compute total pages in system */
  95        num_pages = (_ramend - _rambase) >> PAGE_SHIFT;
  96
  97        /* page numbers */
  98        memstart = PAGE_ALIGN(_ramstart);
  99        min_low_pfn = _rambase >> PAGE_SHIFT;
 100        start_pfn = memstart >> PAGE_SHIFT;
 101        max_low_pfn = _ramend >> PAGE_SHIFT;
 102        high_memory = (void *)_ramend;
 103
 104        m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
 105        module_fixup(NULL, __start_fixup, __stop_fixup);
 106
 107        /* setup bootmem data */
 108        m68k_setup_node(0);
 109        memstart += init_bootmem_node(NODE_DATA(0), start_pfn,
 110                min_low_pfn, max_low_pfn);
 111        free_bootmem_node(NODE_DATA(0), memstart, _ramend - memstart);
 112}
 113
 114#endif /* CONFIG_MMU */
 115
 116/***************************************************************************/
 117
 118void __init config_BSP(char *commandp, int size)
 119{
 120#ifdef CONFIG_MMU
 121        mcf54xx_bootmem_alloc();
 122        mmu_context_init();
 123#endif
 124        mach_reset = mcf54xx_reset;
 125        mach_sched_init = hw_timer_init;
 126        m54xx_uarts_init();
 127}
 128
 129/***************************************************************************/
 130