1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/mach-rpc/riscpc.c
4 *
5 * Copyright (C) 1998-2001 Russell King
6 *
7 * Architecture specific fixups.
8 */
9 #include <linux/kernel.h>
10 #include <linux/tty.h>
11 #include <linux/delay.h>
12 #include <linux/pm.h>
13 #include <linux/init.h>
14 #include <linux/sched.h>
15 #include <linux/device.h>
16 #include <linux/serial_8250.h>
17 #include <linux/ata_platform.h>
18 #include <linux/io.h>
19 #include <linux/i2c.h>
20 #include <linux/reboot.h>
21
22 #include <asm/elf.h>
23 #include <asm/mach-types.h>
24 #include <mach/hardware.h>
25 #include <asm/hardware/iomd.h>
26 #include <asm/page.h>
27 #include <asm/domain.h>
28 #include <asm/setup.h>
29 #include <asm/system_misc.h>
30
31 #include <asm/mach/map.h>
32 #include <asm/mach/arch.h>
33 #include <asm/mach/time.h>
34
35 extern void rpc_init_irq(void);
36
37 unsigned int vram_size;
38 unsigned int memc_ctrl_reg;
39 unsigned int number_mfm_drives;
40
41 static int __init parse_tag_acorn(const struct tag *tag)
42 {
43 memc_ctrl_reg = tag->u.acorn.memc_control_reg;
44 number_mfm_drives = tag->u.acorn.adfsdrives;
45
46 switch (tag->u.acorn.vram_pages) {
47 case 512:
48 vram_size += PAGE_SIZE * 256;
49 fallthrough; /* ??? */
50 case 256:
51 vram_size += PAGE_SIZE * 256;
52 break;
53 default:
54 break;
55 }
56 #if 0
57 if (vram_size) {
58 desc->video_start = 0x02000000;
59 desc->video_end = 0x02000000 + vram_size;
60 }
61 #endif
62 return 0;
63 }
64
65 __tagtable(ATAG_ACORN, parse_tag_acorn);
66
67 static struct map_desc rpc_io_desc[] __initdata = {
68 { /* VRAM */
69 .virtual = SCREEN_BASE,
70 .pfn = __phys_to_pfn(SCREEN_START),
71 .length = 2*1048576,
72 .type = MT_DEVICE
73 }, { /* IO space */
74 .virtual = (u32)IO_BASE,
75 .pfn = __phys_to_pfn(IO_START),
76 .length = IO_SIZE ,
77 .type = MT_DEVICE
78 }, { /* EASI space */
79 .virtual = (unsigned long)EASI_BASE,
80 .pfn = __phys_to_pfn(EASI_START),
81 .length = EASI_SIZE,
82 .type = MT_DEVICE
83 }
84 };
85
86 static void __init rpc_map_io(void)
87 {
88 iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
89
90 /*
91 * Turn off floppy.
92 */
93 writeb(0xc, PCIO_BASE + (0x3f2 << 2));
94
95 /*
96 * RiscPC can't handle half-word loads and stores
97 */
98 elf_hwcap &= ~HWCAP_HALF;
99 }
100
101 static struct resource acornfb_resources[] = {
102 /* VIDC */
103 DEFINE_RES_MEM(0x03400000, 0x00200000),
104 DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
105 };
106
107 static struct platform_device acornfb_device = {
108 .name = "acornfb",
109 .id = -1,
110 .dev = {
111 .coherent_dma_mask = 0xffffffff,
112 },
113 .num_resources = ARRAY_SIZE(acornfb_resources),
114 .resource = acornfb_resources,
115 };
116
117 static struct resource iomd_resources[] = {
118 DEFINE_RES_MEM(0x03200000, 0x10000),
119 };
120
121 static struct platform_device iomd_device = {
122 .name = "iomd",
123 .id = -1,
124 .num_resources = ARRAY_SIZE(iomd_resources),
125 .resource = iomd_resources,
126 };
127
128 static struct resource iomd_kart_resources[] = {
129 DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
130 DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
131 };
132
133 static struct platform_device kbd_device = {
134 .name = "kart",
135 .id = -1,
136 .dev = {
137 .parent = &iomd_device.dev,
138 },
139 .num_resources = ARRAY_SIZE(iomd_kart_resources),
140 .resource = iomd_kart_resources,
141 };
142
143 static struct plat_serial8250_port serial_platform_data[] = {
144 {
145 .mapbase = 0x03010fe0,
146 .irq = IRQ_SERIALPORT,
147 .uartclk = 1843200,
148 .regshift = 2,
149 .iotype = UPIO_MEM,
150 .flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
151 },
152 { },
153 };
154
155 static struct platform_device serial_device = {
156 .name = "serial8250",
157 .id = PLAT8250_DEV_PLATFORM,
158 .dev = {
159 .platform_data = serial_platform_data,
160 },
161 };
162
163 static struct pata_platform_info pata_platform_data = {
164 .ioport_shift = 2,
165 };
166
167 static struct resource pata_resources[] = {
168 DEFINE_RES_MEM(0x030107c0, 0x20),
169 DEFINE_RES_MEM(0x03010fd8, 0x04),
170 DEFINE_RES_IRQ(IRQ_HARDDISK),
171 };
172
173 static struct platform_device pata_device = {
174 .name = "pata_platform",
175 .id = -1,
176 .num_resources = ARRAY_SIZE(pata_resources),
177 .resource = pata_resources,
178 .dev = {
179 .platform_data = &pata_platform_data,
180 .coherent_dma_mask = ~0, /* grumble */
181 },
182 };
183
184 static struct platform_device *devs[] __initdata = {
185 &iomd_device,
186 &kbd_device,
187 &serial_device,
188 &acornfb_device,
189 &pata_device,
190 };
191
192 static struct i2c_board_info i2c_rtc = {
193 I2C_BOARD_INFO("pcf8583", 0x50)
194 };
195
196 static int __init rpc_init(void)
197 {
198 i2c_register_board_info(0, &i2c_rtc, 1);
199 return platform_add_devices(devs, ARRAY_SIZE(devs));
200 }
201
202 arch_initcall(rpc_init);
203
204 static void rpc_restart(enum reboot_mode mode, const char *cmd)
205 {
206 iomd_writeb(0, IOMD_ROMCR0);
207
208 /*
209 * Jump into the ROM
210 */
211 soft_restart(0);
212 }
213
214 void ioc_timer_init(void);
215
216 MACHINE_START(RISCPC, "Acorn-RiscPC")
217 /* Maintainer: Russell King */
218 .atag_offset = 0x100,
219 .reserve_lp0 = 1,
220 .reserve_lp1 = 1,
221 .map_io = rpc_map_io,
222 .init_irq = rpc_init_irq,
223 .init_time = ioc_timer_init,
224 .restart = rpc_restart,
225 MACHINE_END
226
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