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
  29 static struct cpu_table *cpu;
  30
  31 static 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
  43 void __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 /* uart management */
  67 #if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
  68 static int nr_uarts __initdata = 0;
  69
  70 #ifdef CONFIG_SERIAL_SAMSUNG_UARTS
  71 static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
  72 #endif
  73
  74 /* s3c24xx_init_uartdevs
  75  *
  76  * copy the specified platform data and configuration into our central
  77  * set of devices, before the data is thrown away after the init process.
  78  *
  79  * This also fills in the array passed to the serial driver for the
  80  * early initialisation of the console.
  81 */
  82
  83 void __init s3c24xx_init_uartdevs(char *name,
  84                                   struct s3c24xx_uart_resources *res,
  85                                   struct s3c2410_uartcfg *cfg, int no)
  86 {
  87 #ifdef CONFIG_SERIAL_SAMSUNG_UARTS
  88         struct platform_device *platdev;
  89         struct s3c2410_uartcfg *cfgptr = uart_cfgs;
  90         struct s3c24xx_uart_resources *resp;
  91         int uart;
  92
  93         memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
  94
  95         for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
  96                 platdev = s3c24xx_uart_src[cfgptr->hwport];
  97
  98                 resp = res + cfgptr->hwport;
  99
 100                 s3c24xx_uart_devs[uart] = platdev;
 101
 102                 platdev->name = name;
 103                 platdev->resource = resp->resources;
 104                 platdev->num_resources = resp->nr_resources;
 105
 106                 platdev->dev.platform_data = cfgptr;
 107         }
 108
 109         nr_uarts = no;
 110 #endif
 111 }
 112
 113 void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
 114 {
 115         if (cpu == NULL)
 116                 return;
 117
 118         if (cpu->init_uarts == NULL && IS_ENABLED(CONFIG_SAMSUNG_ATAGS)) {
 119                 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
 120         } else
 121                 (cpu->init_uarts)(cfg, no);
 122 }
 123 #endif
 124
 125 static int __init s3c_arch_init(void)
 126 {
 127         int ret;
 128
 129         /* init is only needed for ATAGS based platforms */
 130         if (!IS_ENABLED(CONFIG_ATAGS))
 131                 return 0;
 132
 133         // do the correct init for cpu
 134
 135         if (cpu == NULL) {
 136                 /* Not needed when booting with device tree. */
 137                 if (of_have_populated_dt())
 138                         return 0;
 139                 panic("s3c_arch_init: NULL cpu\n");
 140         }
 141
 142         ret = (cpu->init)();
 143         if (ret != 0)
 144                 return ret;
 145 #if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
 146         ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
 147 #endif
 148         return ret;
 149 }
 150
 151 arch_initcall(s3c_arch_init);