summaryrefslogtreecommitdiffstats
path: root/kernel/arch/m68k/coldfire/m54xx.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/arch/m68k/coldfire/m54xx.c')
-rw-r--r--kernel/arch/m68k/coldfire/m54xx.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/kernel/arch/m68k/coldfire/m54xx.c b/kernel/arch/m68k/coldfire/m54xx.c
new file mode 100644
index 000000000..075aaabd1
--- /dev/null
+++ b/kernel/arch/m68k/coldfire/m54xx.c
@@ -0,0 +1,128 @@
+/***************************************************************************/
+
+/*
+ * 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>
+#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 = (_ramend - _rambase) >> PAGE_SHIFT;
+
+ /* page numbers */
+ memstart = PAGE_ALIGN(_ramstart);
+ min_low_pfn = _rambase >> PAGE_SHIFT;
+ start_pfn = memstart >> PAGE_SHIFT;
+ max_low_pfn = _ramend >> PAGE_SHIFT;
+ 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();
+}
+
+/***************************************************************************/