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	// do the correct init for cpu
156
157	if (cpu == NULL) {
158		/* Not needed when booting with device tree. */
159		if (of_have_populated_dt())
160			return 0;
161		panic("s3c_arch_init: NULL cpu\n");
162	}
163
164	ret = (cpu->init)();
165	if (ret != 0)
166		return ret;
167#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
168	ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
169#endif
170	return ret;
171}
172
173arch_initcall(s3c_arch_init);
174