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
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