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); 152