1 /* linux/arch/arm/plat-s3c/init.c
2 *
3 * Copyright (c) 2008 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 * http://armlinux.simtec.co.uk/
6 *
7 * S3C series CPU initialisation
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/interrupt.h>
17 #include <linux/ioport.h>
18 #include <linux/serial_core.h>
19 #include <linux/platform_device.h>
20
21 #include <mach/hardware.h>
22
23 #include <asm/mach/arch.h>
24 #include <asm/mach/map.h>
25
26 #include <plat/cpu.h>
27 #include <plat/devs.h>
28 #include <plat/clock.h>
29
30 #include <plat/regs-serial.h>
31
32 static struct cpu_table *cpu;
33
s3c_lookup_cpu(unsigned long idcode,struct cpu_table * tab,unsigned int count)34 static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode,
35 struct cpu_table *tab,
36 unsigned int count)
37 {
38 for (; count != 0; count--, tab++) {
39 if ((idcode & tab->idmask) == (tab->idcode & tab->idmask))
40 return tab;
41 }
42
43 return NULL;
44 }
45
s3c_init_cpu(unsigned long idcode,struct cpu_table * cputab,unsigned int cputab_size)46 void __init s3c_init_cpu(unsigned long idcode,
47 struct cpu_table *cputab, unsigned int cputab_size)
48 {
49 cpu = s3c_lookup_cpu(idcode, cputab, cputab_size);
50
51 if (cpu == NULL) {
52 printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
53 panic("Unknown S3C24XX CPU");
54 }
55
56 printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
57
58 if (cpu->map_io == NULL || cpu->init == NULL) {
59 printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
60 panic("Unsupported Samsung CPU");
61 }
62
63 cpu->map_io();
64 }
65
66 /* s3c24xx_init_clocks
67 *
68 * Initialise the clock subsystem and associated information from the
69 * given master crystal value.
70 *
71 * xtal = 0 -> use default PLL crystal value (normally 12MHz)
72 * != 0 -> PLL crystal value in Hz
73 */
74
s3c24xx_init_clocks(int xtal)75 void __init s3c24xx_init_clocks(int xtal)
76 {
77 if (xtal == 0)
78 xtal = 12*1000*1000;
79
80 if (cpu == NULL)
81 panic("s3c24xx_init_clocks: no cpu setup?\n");
82
83 if (cpu->init_clocks == NULL)
84 panic("s3c24xx_init_clocks: cpu has no clock init\n");
85 else
86 (cpu->init_clocks)(xtal);
87 }
88
89 /* uart management */
90
91 static int nr_uarts __initdata = 0;
92
93 static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
94
95 /* s3c24xx_init_uartdevs
96 *
97 * copy the specified platform data and configuration into our central
98 * set of devices, before the data is thrown away after the init process.
99 *
100 * This also fills in the array passed to the serial driver for the
101 * early initialisation of the console.
102 */
103
s3c24xx_init_uartdevs(char * name,struct s3c24xx_uart_resources * res,struct s3c2410_uartcfg * cfg,int no)104 void __init s3c24xx_init_uartdevs(char *name,
105 struct s3c24xx_uart_resources *res,
106 struct s3c2410_uartcfg *cfg, int no)
107 {
108 struct platform_device *platdev;
109 struct s3c2410_uartcfg *cfgptr = uart_cfgs;
110 struct s3c24xx_uart_resources *resp;
111 int uart;
112
113 memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
114
115 for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
116 platdev = s3c24xx_uart_src[cfgptr->hwport];
117
118 resp = res + cfgptr->hwport;
119
120 s3c24xx_uart_devs[uart] = platdev;
121
122 platdev->name = name;
123 platdev->resource = resp->resources;
124 platdev->num_resources = resp->nr_resources;
125
126 platdev->dev.platform_data = cfgptr;
127 }
128
129 nr_uarts = no;
130 }
131
s3c24xx_init_uarts(struct s3c2410_uartcfg * cfg,int no)132 void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
133 {
134 if (cpu == NULL)
135 return;
136
137 if (cpu->init_uarts == NULL) {
138 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
139 } else
140 (cpu->init_uarts)(cfg, no);
141 }
142
s3c_arch_init(void)143 static int __init s3c_arch_init(void)
144 {
145 int ret;
146
147 // do the correct init for cpu
148
149 if (cpu == NULL)
150 panic("s3c_arch_init: NULL cpu\n");
151
152 ret = (cpu->init)();
153 if (ret != 0)
154 return ret;
155
156 ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
157 return ret;
158 }
159
160 arch_initcall(s3c_arch_init);
161