1 /* linux/arch/arm/mach-s3c2410/s3c2410.c
2 *
3 * Copyright (c) 2003-2005 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * http://www.simtec.co.uk/products/EB2410ITX/
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/interrupt.h>
16 #include <linux/list.h>
17 #include <linux/timer.h>
18 #include <linux/init.h>
19 #include <linux/clk.h>
20 #include <linux/sysdev.h>
21 #include <linux/serial_core.h>
22 #include <linux/platform_device.h>
23 #include <linux/io.h>
24
25 #include <asm/mach/arch.h>
26 #include <asm/mach/map.h>
27 #include <asm/mach/irq.h>
28
29 #include <mach/hardware.h>
30 #include <asm/irq.h>
31
32 #include <plat/cpu-freq.h>
33
34 #include <mach/regs-clock.h>
35 #include <plat/regs-serial.h>
36
37 #include <plat/s3c2410.h>
38 #include <plat/cpu.h>
39 #include <plat/devs.h>
40 #include <plat/clock.h>
41 #include <plat/pll.h>
42
43 /* Initial IO mappings */
44
45 static struct map_desc s3c2410_iodesc[] __initdata = {
46 IODESC_ENT(CLKPWR),
47 IODESC_ENT(TIMER),
48 IODESC_ENT(WATCHDOG),
49 };
50
51 /* our uart devices */
52
53 /* uart registration process */
54
55 void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
56 {
57 s3c24xx_init_uartdevs("s3c2410-uart", s3c2410_uart_resources, cfg, no);
58 }
59
60 /* s3c2410_map_io
61 *
62 * register the standard cpu IO areas, and any passed in from the
63 * machine specific initialisation.
64 */
65
66 void __init s3c2410_map_io(void)
67 {
68 iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
69 }
70
71 void __init_or_cpufreq s3c2410_setup_clocks(void)
72 {
73 struct clk *xtal_clk;
74 unsigned long tmp;
75 unsigned long xtal;
76 unsigned long fclk;
77 unsigned long hclk;
78 unsigned long pclk;
79
80 xtal_clk = clk_get(NULL, "xtal");
81 xtal = clk_get_rate(xtal_clk);
82 clk_put(xtal_clk);
83
84 /* now we've got our machine bits initialised, work out what
85 * clocks we've got */
86
87 fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal);
88
89 tmp = __raw_readl(S3C2410_CLKDIVN);
90
91 /* work out clock scalings */
92
93 hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
94 pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);
95
96 /* print brieft summary of clocks, etc */
97
98 printk("S3C2410: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
99 print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
100
101 /* initialise the clocks here, to allow other things like the
102 * console to use them
103 */
104
105 s3c24xx_setup_clocks(fclk, hclk, pclk);
106 }
107
108 void __init s3c2410_init_clocks(int xtal)
109 {
110 s3c24xx_register_baseclocks(xtal);
111 s3c2410_setup_clocks();
112 s3c2410_baseclk_add();
113 }
114
115 struct sysdev_class s3c2410_sysclass = {
116 .name = "s3c2410-core",
117 };
118
119 static struct sys_device s3c2410_sysdev = {
120 .cls = &s3c2410_sysclass,
121 };
122
123 /* need to register class before we actually register the device, and
124 * we also need to ensure that it has been initialised before any of the
125 * drivers even try to use it (even if not on an s3c2410 based system)
126 * as a driver which may support both 2410 and 2440 may try and use it.
127 */
128
129 static int __init s3c2410_core_init(void)
130 {
131 return sysdev_class_register(&s3c2410_sysclass);
132 }
133
134 core_initcall(s3c2410_core_init);
135
136 int __init s3c2410_init(void)
137 {
138 printk("S3C2410: Initialising architecture\n");
139
140 return sysdev_register(&s3c2410_sysdev);
141 }
142
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