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/***************************************************************************/
/*
* m54xx.c -- platform support for ColdFire 54xx based boards
*
* Copyright (C) 2010, Philippe De Muyter <phdm@macqel.be>
*/
/***************************************************************************/
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/clk.h>
#include <linux/bootmem.h>
#include <asm/pgalloc.h>
#include <asm/machdep.h>
#include <asm/coldfire.h>
#include <asm/m54xxsim.h>
#include <asm/mcfuart.h>
#include <asm/mcfclk.h>
#include <asm/m54xxgpt.h>
#ifdef CONFIG_MMU
#include <asm/mmu_context.h>
#include <linux/pfn.h>
#endif
/***************************************************************************/
DEFINE_CLK(pll, "pll.0", MCF_CLK);
DEFINE_CLK(sys, "sys.0", MCF_BUSCLK);
DEFINE_CLK(mcfslt0, "mcfslt.0", MCF_BUSCLK);
DEFINE_CLK(mcfslt1, "mcfslt.1", MCF_BUSCLK);
DEFINE_CLK(mcfuart0, "mcfuart.0", MCF_BUSCLK);
DEFINE_CLK(mcfuart1, "mcfuart.1", MCF_BUSCLK);
DEFINE_CLK(mcfuart2, "mcfuart.2", MCF_BUSCLK);
DEFINE_CLK(mcfuart3, "mcfuart.3", MCF_BUSCLK);
struct clk *mcf_clks[] = {
&clk_pll,
&clk_sys,
&clk_mcfslt0,
&clk_mcfslt1,
&clk_mcfuart0,
&clk_mcfuart1,
&clk_mcfuart2,
&clk_mcfuart3,
NULL
};
/***************************************************************************/
static void __init m54xx_uarts_init(void)
{
/* enable io pins */
__raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC0);
__raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS,
MCFGPIO_PAR_PSC1);
__raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS |
MCF_PAR_PSC_CTS_CTS, MCFGPIO_PAR_PSC2);
__raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC3);
}
/***************************************************************************/
static void mcf54xx_reset(void)
{
/* disable interrupts and enable the watchdog */
asm("movew #0x2700, %sr\n");
__raw_writel(0, MCF_GPT_GMS0);
__raw_writel(MCF_GPT_GCIR_CNT(1), MCF_GPT_GCIR0);
__raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),
MCF_GPT_GMS0);
}
/***************************************************************************/
#ifdef CONFIG_MMU
unsigned long num_pages;
static void __init mcf54xx_bootmem_alloc(void)
{
unsigned long start_pfn;
unsigned long memstart;
/* _rambase and _ramend will be naturally page aligned */
m68k_memory[0].addr = _rambase;
m68k_memory[0].size = _ramend - _rambase;
/* compute total pages in system */
num_pages = PFN_DOWN(_ramend - _rambase);
/* page numbers */
memstart = PAGE_ALIGN(_ramstart);
min_low_pfn = PFN_DOWN(_rambase);
start_pfn = PFN_DOWN(memstart);
max_low_pfn = PFN_DOWN(_ramend);
high_memory = (void *)_ramend;
m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
module_fixup(NULL, __start_fixup, __stop_fixup);
/* setup bootmem data */
m68k_setup_node(0);
memstart += init_bootmem_node(NODE_DATA(0), start_pfn,
min_low_pfn, max_low_pfn);
free_bootmem_node(NODE_DATA(0), memstart, _ramend - memstart);
}
#endif /* CONFIG_MMU */
/***************************************************************************/
void __init config_BSP(char *commandp, int size)
{
#ifdef CONFIG_MMU
mcf54xx_bootmem_alloc();
mmu_context_init();
#endif
mach_reset = mcf54xx_reset;
mach_sched_init = hw_timer_init;
m54xx_uarts_init();
}
/***************************************************************************/
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