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 
s3c_lookup_cpu(unsigned long idcode,struct cpu_table * tab,unsigned int count)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 
s3c_init_cpu(unsigned long idcode,struct cpu_table * cputab,unsigned int cputab_size)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 
s3c24xx_init_uartdevs(char * name,struct s3c24xx_uart_resources * res,struct s3c2410_uartcfg * cfg,int no)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 
s3c24xx_init_uarts(struct s3c2410_uartcfg * cfg,int no)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 
s3c_arch_init(void)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