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, tab: cputab, count: cputab_size); |
47 | |
48 | if (cpu == NULL) { |
49 | printk(KERN_ERR "Unknown CPU type 0x%08lx\n" , idcode); |
50 | panic(fmt: "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(fmt: "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(fmt: "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 | |