LXR linux/arch/arm/mach-s3c/init.c

   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);
 176