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Linux/arch/arm/plat-samsung/init.c

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  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 <plat/cpu.h>
 27 #include <plat/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 
 64 /* s3c24xx_init_clocks
 65  *
 66  * Initialise the clock subsystem and associated information from the
 67  * given master crystal value.
 68  *
 69  * xtal  = 0 -> use default PLL crystal value (normally 12MHz)
 70  *      != 0 -> PLL crystal value in Hz
 71 */
 72 
 73 void __init s3c24xx_init_clocks(int xtal)
 74 {
 75         if (xtal == 0)
 76                 xtal = 12*1000*1000;
 77 
 78         if (cpu == NULL)
 79                 panic("s3c24xx_init_clocks: no cpu setup?\n");
 80 
 81         if (cpu->init_clocks == NULL)
 82                 panic("s3c24xx_init_clocks: cpu has no clock init\n");
 83         else
 84                 (cpu->init_clocks)(xtal);
 85 }
 86 
 87 /* uart management */
 88 #if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
 89 static int nr_uarts __initdata = 0;
 90 
 91 #ifdef CONFIG_SERIAL_SAMSUNG_UARTS
 92 static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
 93 #endif
 94 
 95 /* s3c24xx_init_uartdevs
 96  *
 97  * copy the specified platform data and configuration into our central
 98  * set of devices, before the data is thrown away after the init process.
 99  *
100  * This also fills in the array passed to the serial driver for the
101  * early initialisation of the console.
102 */
103 
104 void __init s3c24xx_init_uartdevs(char *name,
105                                   struct s3c24xx_uart_resources *res,
106                                   struct s3c2410_uartcfg *cfg, int no)
107 {
108 #ifdef CONFIG_SERIAL_SAMSUNG_UARTS
109         struct platform_device *platdev;
110         struct s3c2410_uartcfg *cfgptr = uart_cfgs;
111         struct s3c24xx_uart_resources *resp;
112         int uart;
113 
114         memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
115 
116         for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
117                 platdev = s3c24xx_uart_src[cfgptr->hwport];
118 
119                 resp = res + cfgptr->hwport;
120 
121                 s3c24xx_uart_devs[uart] = platdev;
122 
123                 platdev->name = name;
124                 platdev->resource = resp->resources;
125                 platdev->num_resources = resp->nr_resources;
126 
127                 platdev->dev.platform_data = cfgptr;
128         }
129 
130         nr_uarts = no;
131 #endif
132 }
133 
134 void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
135 {
136         if (cpu == NULL)
137                 return;
138 
139         if (cpu->init_uarts == NULL && IS_ENABLED(CONFIG_SAMSUNG_ATAGS)) {
140                 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
141         } else
142                 (cpu->init_uarts)(cfg, no);
143 }
144 #endif
145 
146 static int __init s3c_arch_init(void)
147 {
148         int ret;
149 
150         /* init is only needed for ATAGS based platforms */
151         if (!IS_ENABLED(CONFIG_ATAGS) ||
152             (!soc_is_s3c24xx() && !soc_is_s3c64xx()))
153                 return 0;
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 
173 arch_initcall(s3c_arch_init);
174 

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