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 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