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 #include <asm/mcfclk.h> 27 #ifdef CONFIG_MMU 28 #include <asm/mmu_context.h> 29 #endif 30 31 /***************************************************************************/ 32 33 DEFINE_CLK(pll, "pll.0", MCF_CLK); 34 DEFINE_CLK(sys, "sys.0", MCF_BUSCLK); 35 DEFINE_CLK(mcfslt0, "mcfslt.0", MCF_BUSCLK); 36 DEFINE_CLK(mcfslt1, "mcfslt.1", MCF_BUSCLK); 37 DEFINE_CLK(mcfuart0, "mcfuart.0", MCF_BUSCLK); 38 DEFINE_CLK(mcfuart1, "mcfuart.1", MCF_BUSCLK); 39 DEFINE_CLK(mcfuart2, "mcfuart.2", MCF_BUSCLK); 40 DEFINE_CLK(mcfuart3, "mcfuart.3", MCF_BUSCLK); 41 42 struct 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 56 static 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 69 static 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 83 unsigned long num_pages; 84 85 static 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 /***************************************************************************/ 117 118 void __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