summaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-samsung/init.c
blob: e9acf02ef3c38ae92ba40d829123b54969e82ac6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2008 Simtec Electronics
//	Ben Dooks <ben@simtec.co.uk>
//	http://armlinux.simtec.co.uk/
//
// S3C series CPU initialisation

/*
 * NOTE: Code in this file is not used on S3C64xx when booting with
 * Device Tree support.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/serial_core.h>
#include <linux/serial_s3c.h>
#include <linux/platform_device.h>
#include <linux/of.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include <plat/cpu.h>
#include <plat/devs.h>

static struct cpu_table *cpu;

static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode,
						struct cpu_table *tab,
						unsigned int count)
{
	for (; count != 0; count--, tab++) {
		if ((idcode & tab->idmask) == (tab->idcode & tab->idmask))
			return tab;
	}

	return NULL;
}

void __init s3c_init_cpu(unsigned long idcode,
			 struct cpu_table *cputab, unsigned int cputab_size)
{
	cpu = s3c_lookup_cpu(idcode, cputab, cputab_size);

	if (cpu == NULL) {
		printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
		panic("Unknown S3C24XX CPU");
	}

	printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);

	if (cpu->init == NULL) {
		printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
		panic("Unsupported Samsung CPU");
	}

	if (cpu->map_io)
		cpu->map_io();
}

/* s3c24xx_init_clocks
 *
 * Initialise the clock subsystem and associated information from the
 * given master crystal value.
 *
 * xtal  = 0 -> use default PLL crystal value (normally 12MHz)
 *      != 0 -> PLL crystal value in Hz
*/

void __init s3c24xx_init_clocks(int xtal)
{
	if (xtal == 0)
		xtal = 12*1000*1000;

	if (cpu == NULL)
		panic("s3c24xx_init_clocks: no cpu setup?\n");

	if (cpu->init_clocks == NULL)
		panic("s3c24xx_init_clocks: cpu has no clock init\n");
	else
		(cpu->init_clocks)(xtal);
}

/* uart management */
#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
static int nr_uarts __initdata = 0;

#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
#endif

/* s3c24xx_init_uartdevs
 *
 * copy the specified platform data and configuration into our central
 * set of devices, before the data is thrown away after the init process.
 *
 * This also fills in the array passed to the serial driver for the
 * early initialisation of the console.
*/

void __init s3c24xx_init_uartdevs(char *name,
				  struct s3c24xx_uart_resources *res,
				  struct s3c2410_uartcfg *cfg, int no)
{
#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
	struct platform_device *platdev;
	struct s3c2410_uartcfg *cfgptr = uart_cfgs;
	struct s3c24xx_uart_resources *resp;
	int uart;

	memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);

	for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
		platdev = s3c24xx_uart_src[cfgptr->hwport];

		resp = res + cfgptr->hwport;

		s3c24xx_uart_devs[uart] = platdev;

		platdev->name = name;
		platdev->resource = resp->resources;
		platdev->num_resources = resp->nr_resources;

		platdev->dev.platform_data = cfgptr;
	}

	nr_uarts = no;
#endif
}

void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
	if (cpu == NULL)
		return;

	if (cpu->init_uarts == NULL && IS_ENABLED(CONFIG_SAMSUNG_ATAGS)) {
		printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
	} else
		(cpu->init_uarts)(cfg, no);
}
#endif

static int __init s3c_arch_init(void)
{
	int ret;

	/* init is only needed for ATAGS based platforms */
	if (!IS_ENABLED(CONFIG_ATAGS) ||
	    (!soc_is_s3c24xx() && !soc_is_s3c64xx()))
		return 0;

	// do the correct init for cpu

	if (cpu == NULL) {
		/* Not needed when booting with device tree. */
		if (of_have_populated_dt())
			return 0;
		panic("s3c_arch_init: NULL cpu\n");
	}

	ret = (cpu->init)();
	if (ret != 0)
		return ret;
#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
	ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
#endif
	return ret;
}

arch_initcall(s3c_arch_init);