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#ifdef CONFIG_MMU
27#include <asm/mmu_context.h>
28#endif
29
30/***************************************************************************/
31
32DEFINE_CLK(pll, "pll.0", MCF_CLK);
33DEFINE_CLK(sys, "sys.0", MCF_BUSCLK);
34DEFINE_CLK(mcfslt0, "mcfslt.0", MCF_BUSCLK);
35DEFINE_CLK(mcfslt1, "mcfslt.1", MCF_BUSCLK);
36DEFINE_CLK(mcfuart0, "mcfuart.0", MCF_BUSCLK);
37DEFINE_CLK(mcfuart1, "mcfuart.1", MCF_BUSCLK);
38DEFINE_CLK(mcfuart2, "mcfuart.2", MCF_BUSCLK);
39DEFINE_CLK(mcfuart3, "mcfuart.3", MCF_BUSCLK);
40
41struct 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
51};
52
53/***************************************************************************/
54
55static void __init m54xx_uarts_init(void)
56{
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);
64}
65
66/***************************************************************************/
67
68static void mcf54xx_reset(void)
69{
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);
76}
77
78/***************************************************************************/
79
80#ifdef CONFIG_MMU
81
82unsigned long num_pages;
83
84static void __init mcf54xx_bootmem_alloc(void)
85{
86	unsigned long start_pfn;
87	unsigned long memstart;
88
89	/* _rambase and _ramend will be naturally page aligned */
90	m68k_memory[0].addr = _rambase;
91	m68k_memory[0].size = _ramend - _rambase;
92
93	/* compute total pages in system */
94	num_pages = (_ramend - _rambase) >> PAGE_SHIFT;
95
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;
102
103	m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
104	module_fixup(NULL, __start_fixup, __stop_fixup);
105
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);
111}
112
113#endif /* CONFIG_MMU */
114
115/***************************************************************************/
116
117void __init config_BSP(char *commandp, int size)
118{
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();
126}
127
128/***************************************************************************/
129