1// SPDX-License-Identifier: GPL-2.0
  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/*
 10 * NOTE: Code in this file is not used on S3C64xx when booting with
 11 * Device Tree support.
 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/serial_s3c.h>
 20#include <linux/platform_device.h>
 21#include <linux/of.h>
 22
 23#include <asm/mach/arch.h>
 24#include <asm/mach/map.h>
 25
 26#include "cpu.h"
 27#include "devs.h"
 28
 29static struct cpu_table *cpu;
 30
 31static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode,
 32						struct cpu_table *tab,
 33						unsigned int count)
 34{
 35	for (; count != 0; count--, tab++) {
 36		if ((idcode & tab->idmask) == (tab->idcode & tab->idmask))
 37			return tab;
 38	}
 39
 40	return NULL;
 41}
 42
 43void __init s3c_init_cpu(unsigned long idcode,
 44			 struct cpu_table *cputab, unsigned int cputab_size)
 45{
 46	cpu = s3c_lookup_cpu(idcode, cputab, cputab_size);
 47
 48	if (cpu == NULL) {
 49		printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
 50		panic("Unknown S3C24XX CPU");
 51	}
 52
 53	printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
 54
 55	if (cpu->init == NULL) {
 56		printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
 57		panic("Unsupported Samsung CPU");
 58	}
 59
 60	if (cpu->map_io)
 61		cpu->map_io();
 62
 63	pr_err("The platform is deprecated and scheduled for removal. Please reach to the maintainers of the platform and linux-samsung-soc@vger.kernel.org if you still use it.  Without such feedback, the platform will be removed after 2022.\n");
 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#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
 91static int nr_uarts __initdata = 0;
 92
 93#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
 94static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
 95#endif
 96
 97/* s3c24xx_init_uartdevs
 98 *
 99 * copy the specified platform data and configuration into our central
100 * set of devices, before the data is thrown away after the init process.
101 *
102 * This also fills in the array passed to the serial driver for the
103 * early initialisation of the console.
104*/
105
106void __init s3c24xx_init_uartdevs(char *name,
107				  struct s3c24xx_uart_resources *res,
108				  struct s3c2410_uartcfg *cfg, int no)
109{
110#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
111	struct platform_device *platdev;
112	struct s3c2410_uartcfg *cfgptr = uart_cfgs;
113	struct s3c24xx_uart_resources *resp;
114	int uart;
115
116	memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
117
118	for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
119		platdev = s3c24xx_uart_src[cfgptr->hwport];
120
121		resp = res + cfgptr->hwport;
122
123		s3c24xx_uart_devs[uart] = platdev;
124
125		platdev->name = name;
126		platdev->resource = resp->resources;
127		platdev->num_resources = resp->nr_resources;
128
129		platdev->dev.platform_data = cfgptr;
130	}
131
132	nr_uarts = no;
133#endif
134}
135
136void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
137{
138	if (cpu == NULL)
139		return;
140
141	if (cpu->init_uarts == NULL && IS_ENABLED(CONFIG_SAMSUNG_ATAGS)) {
142		printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
143	} else
144		(cpu->init_uarts)(cfg, no);
145}
146#endif
147
148static int __init s3c_arch_init(void)
149{
150	int ret;
151
152	/* init is only needed for ATAGS based platforms */
153	if (!IS_ENABLED(CONFIG_ATAGS) ||
154	    (!soc_is_s3c24xx() && !soc_is_s3c64xx()))
155		return 0;
156
157	// do the correct init for cpu
158
159	if (cpu == NULL) {
160		/* Not needed when booting with device tree. */
161		if (of_have_populated_dt())
162			return 0;
163		panic("s3c_arch_init: NULL cpu\n");
164	}
165
166	ret = (cpu->init)();
167	if (ret != 0)
168		return ret;
169#if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
170	ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
171#endif
172	return ret;
173}
174
175arch_initcall(s3c_arch_init);