xref: /openbmc/linux/arch/arm/mach-rpc/riscpc.c (revision 696e572d)
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 
parse_tag_acorn(const struct tag * tag)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 
rpc_map_io(void)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 
rpc_init(void)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 
rpc_restart(enum reboot_mode mode,const char * cmd)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