Linux Kernel  3.7.1
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init.c
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1 /* linux/arch/arm/plat-s3c/init.c
2  *
3  * Copyright (c) 2008 Simtec Electronics
4  * Ben Dooks <[email protected]>
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 
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 
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 
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 
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;
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 
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 
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);