mm: page_alloc: embed OOM killing naturally into allocation slowpath
[linux-2.6/btrfs-unstable.git] / arch / m68k / coldfire / m54xx.c
blob075aaabd136026a408ee4560ee4870127c6b1b9d
1 /***************************************************************************/
3 /*
4 * m54xx.c -- platform support for ColdFire 54xx based boards
6 * Copyright (C) 2010, Philippe De Muyter <phdm@macqel.be>
7 */
9 /***************************************************************************/
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
30 /***************************************************************************/
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);
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
53 /***************************************************************************/
55 static void __init m54xx_uarts_init(void)
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);
66 /***************************************************************************/
68 static void mcf54xx_reset(void)
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);
78 /***************************************************************************/
80 #ifdef CONFIG_MMU
82 unsigned long num_pages;
84 static void __init mcf54xx_bootmem_alloc(void)
86 unsigned long start_pfn;
87 unsigned long memstart;
89 /* _rambase and _ramend will be naturally page aligned */
90 m68k_memory[0].addr = _rambase;
91 m68k_memory[0].size = _ramend - _rambase;
93 /* compute total pages in system */
94 num_pages = (_ramend - _rambase) >> PAGE_SHIFT;
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;
103 m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
104 module_fixup(NULL, __start_fixup, __stop_fixup);
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);
113 #endif /* CONFIG_MMU */
115 /***************************************************************************/
117 void __init config_BSP(char *commandp, int size)
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();
128 /***************************************************************************/