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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/*
15 * NOTE: Code in this file is not used on S3C64xx when booting with
16 * Device Tree support.
17 */
18
19#include <linux/init.h>
20#include <linux/module.h>
21#include <linux/interrupt.h>
22#include <linux/ioport.h>
23#include <linux/serial_core.h>
24#include <linux/serial_s3c.h>
25#include <linux/platform_device.h>
26#include <linux/of.h>
27
28#include <asm/mach/arch.h>
29#include <asm/mach/map.h>
30
31#include <plat/cpu.h>
32#include <plat/devs.h>
33
34static struct cpu_table *cpu;
35
36static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode,
37 struct cpu_table *tab,
38 unsigned int count)
39{
40 for (; count != 0; count--, tab++) {
41 if ((idcode & tab->idmask) == (tab->idcode & tab->idmask))
42 return tab;
43 }
44
45 return NULL;
46}
47
48void __init s3c_init_cpu(unsigned long idcode,
49 struct cpu_table *cputab, unsigned int cputab_size)
50{
51 cpu = s3c_lookup_cpu(idcode, cputab, cputab_size);
52
53 if (cpu == NULL) {
54 printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
55 panic("Unknown S3C24XX CPU");
56 }
57
58 printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
59
60 if (cpu->init == NULL) {
61 printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
62 panic("Unsupported Samsung CPU");
63 }
64
65 if (cpu->map_io)
66 cpu->map_io();
67}
68
69/* s3c24xx_init_clocks
70 *
71 * Initialise the clock subsystem and associated information from the
72 * given master crystal value.
73 *
74 * xtal = 0 -> use default PLL crystal value (normally 12MHz)
75 * != 0 -> PLL crystal value in Hz
76*/
77
78void __init s3c24xx_init_clocks(int xtal)
79{
80 if (xtal == 0)
81 xtal = 12*1000*1000;
82
83 if (cpu == NULL)
84 panic("s3c24xx_init_clocks: no cpu setup?\n");
85
86 if (cpu->init_clocks == NULL)
87 panic("s3c24xx_init_clocks: cpu has no clock init\n");
88 else
89 (cpu->init_clocks)(xtal);
90}
91
92/* uart management */
93#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
94static int nr_uarts __initdata = 0;
95
96#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
97static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
98#endif
99
100/* s3c24xx_init_uartdevs
101 *
102 * copy the specified platform data and configuration into our central
103 * set of devices, before the data is thrown away after the init process.
104 *
105 * This also fills in the array passed to the serial driver for the
106 * early initialisation of the console.
107*/
108
109void __init s3c24xx_init_uartdevs(char *name,
110 struct s3c24xx_uart_resources *res,
111 struct s3c2410_uartcfg *cfg, int no)
112{
113#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
114 struct platform_device *platdev;
115 struct s3c2410_uartcfg *cfgptr = uart_cfgs;
116 struct s3c24xx_uart_resources *resp;
117 int uart;
118
119 memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
120
121 for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
122 platdev = s3c24xx_uart_src[cfgptr->hwport];
123
124 resp = res + cfgptr->hwport;
125
126 s3c24xx_uart_devs[uart] = platdev;
127
128 platdev->name = name;
129 platdev->resource = resp->resources;
130 platdev->num_resources = resp->nr_resources;
131
132 platdev->dev.platform_data = cfgptr;
133 }
134
135 nr_uarts = no;
136#endif
137}
138
139void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
140{
141 if (cpu == NULL)
142 return;
143
144 if (cpu->init_uarts == NULL && IS_ENABLED(CONFIG_SAMSUNG_ATAGS)) {
145 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
146 } else
147 (cpu->init_uarts)(cfg, no);
148}
149#endif
150
151static int __init s3c_arch_init(void)
152{
153 int ret;
154
155 /* init is only needed for ATAGS based platforms */
156 if (!IS_ENABLED(CONFIG_ATAGS) ||
157 (!soc_is_s3c24xx() && !soc_is_s3c64xx()))
158 return 0;
159
160 // do the correct init for cpu
161
162 if (cpu == NULL) {
163 /* Not needed when booting with device tree. */
164 if (of_have_populated_dt())
165 return 0;
166 panic("s3c_arch_init: NULL cpu\n");
167 }
168
169 ret = (cpu->init)();
170 if (ret != 0)
171 return ret;
172#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
173 ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
174#endif
175 return ret;
176}
177
178arch_initcall(s3c_arch_init);
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
32static struct cpu_table *cpu;
33
34static 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
46void __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
75void __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
91static int nr_uarts __initdata = 0;
92
93static 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
104void __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
132void __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
143static 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
160arch_initcall(s3c_arch_init);