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
35extern void rpc_init_irq(void);
36
37unsigned int vram_size;
38unsigned int memc_ctrl_reg;
39unsigned int number_mfm_drives;
40
41static 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
67static 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
86static 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
101static struct resource acornfb_resources[] = {
102	/* VIDC */
103	DEFINE_RES_MEM(0x03400000, 0x00200000),
104	DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
105};
106
107static 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
117static struct resource iomd_resources[] = {
118	DEFINE_RES_MEM(0x03200000, 0x10000),
119};
120
121static struct platform_device iomd_device = {
122	.name			= "iomd",
123	.id			= -1,
124	.num_resources		= ARRAY_SIZE(iomd_resources),
125	.resource		= iomd_resources,
126};
127
128static struct resource iomd_kart_resources[] = {
129	DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
130	DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
131};
132
133static 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
143static 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
155static struct platform_device serial_device = {
156	.name			= "serial8250",
157	.id			= PLAT8250_DEV_PLATFORM,
158	.dev			= {
159		.platform_data	= serial_platform_data,
160	},
161};
162
163static struct pata_platform_info pata_platform_data = {
164	.ioport_shift		= 2,
165};
166
167static struct resource pata_resources[] = {
168	DEFINE_RES_MEM(0x030107c0, 0x20),
169	DEFINE_RES_MEM(0x03010fd8, 0x04),
170	DEFINE_RES_IRQ(IRQ_HARDDISK),
171};
172
173static 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
184static struct platform_device *devs[] __initdata = {
185	&iomd_device,
186	&kbd_device,
187	&serial_device,
188	&acornfb_device,
189	&pata_device,
190};
191
192static struct i2c_board_info i2c_rtc = {
193	I2C_BOARD_INFO("pcf8583", 0x50)
194};
195
196static 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
202arch_initcall(rpc_init);
203
204static 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
214void ioc_timer_init(void);
215
216MACHINE_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,
225MACHINE_END
226