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	default:
53		break;
54	}
55#if 0
56	if (vram_size) {
57		desc->video_start = 0x02000000;
58		desc->video_end   = 0x02000000 + vram_size;
59	}
60#endif
61	return 0;
62}
63
64__tagtable(ATAG_ACORN, parse_tag_acorn);
65
66static struct map_desc rpc_io_desc[] __initdata = {
67 	{	/* VRAM		*/
68		.virtual	=  SCREEN_BASE,
69		.pfn		= __phys_to_pfn(SCREEN_START),
70		.length		= 	2*1048576,
71		.type		= MT_DEVICE
72	}, {	/* IO space	*/
73		.virtual	=  (u32)IO_BASE,
74		.pfn		= __phys_to_pfn(IO_START),
75		.length		= 	IO_SIZE	 ,
76		.type		= MT_DEVICE
77	}, {	/* EASI space	*/
78		.virtual	= (unsigned long)EASI_BASE,
79		.pfn		= __phys_to_pfn(EASI_START),
80		.length		= EASI_SIZE,
81		.type		= MT_DEVICE
82	}
83};
84
85static void __init rpc_map_io(void)
86{
87	iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
88
89	/*
90	 * Turn off floppy.
91	 */
92	writeb(0xc, PCIO_BASE + (0x3f2 << 2));
93
94	/*
95	 * RiscPC can't handle half-word loads and stores
96	 */
97	elf_hwcap &= ~HWCAP_HALF;
98}
99
100static struct resource acornfb_resources[] = {
101	/* VIDC */
102	DEFINE_RES_MEM(0x03400000, 0x00200000),
103	DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
104};
105
106static struct platform_device acornfb_device = {
107	.name			= "acornfb",
108	.id			= -1,
109	.dev			= {
110		.coherent_dma_mask = 0xffffffff,
111	},
112	.num_resources		= ARRAY_SIZE(acornfb_resources),
113	.resource		= acornfb_resources,
114};
115
116static struct resource iomd_resources[] = {
117	DEFINE_RES_MEM(0x03200000, 0x10000),
118};
119
120static struct platform_device iomd_device = {
121	.name			= "iomd",
122	.id			= -1,
123	.num_resources		= ARRAY_SIZE(iomd_resources),
124	.resource		= iomd_resources,
125};
126
127static struct resource iomd_kart_resources[] = {
128	DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
129	DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
130};
131
132static struct platform_device kbd_device = {
133	.name			= "kart",
134	.id			= -1,
135	.dev			= {
136		.parent 	= &iomd_device.dev,
137	},
138	.num_resources		= ARRAY_SIZE(iomd_kart_resources),
139	.resource		= iomd_kart_resources,
140};
141
142static struct plat_serial8250_port serial_platform_data[] = {
143	{
144		.mapbase	= 0x03010fe0,
145		.irq		= IRQ_SERIALPORT,
146		.uartclk	= 1843200,
147		.regshift	= 2,
148		.iotype		= UPIO_MEM,
149		.flags		= UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
150	},
151	{ },
152};
153
154static struct platform_device serial_device = {
155	.name			= "serial8250",
156	.id			= PLAT8250_DEV_PLATFORM,
157	.dev			= {
158		.platform_data	= serial_platform_data,
159	},
160};
161
162static struct pata_platform_info pata_platform_data = {
163	.ioport_shift		= 2,
164};
165
166static struct resource pata_resources[] = {
167	DEFINE_RES_MEM(0x030107c0, 0x20),
168	DEFINE_RES_MEM(0x03010fd8, 0x04),
169	DEFINE_RES_IRQ(IRQ_HARDDISK),
170};
171
172static struct platform_device pata_device = {
173	.name			= "pata_platform",
174	.id			= -1,
175	.num_resources		= ARRAY_SIZE(pata_resources),
176	.resource		= pata_resources,
177	.dev			= {
178		.platform_data	= &pata_platform_data,
179		.coherent_dma_mask = ~0,	/* grumble */
180	},
181};
182
183static struct platform_device *devs[] __initdata = {
184	&iomd_device,
185	&kbd_device,
186	&serial_device,
187	&acornfb_device,
188	&pata_device,
189};
190
191static struct i2c_board_info i2c_rtc = {
192	I2C_BOARD_INFO("pcf8583", 0x50)
193};
194
195static int __init rpc_init(void)
196{
197	i2c_register_board_info(0, &i2c_rtc, 1);
198	return platform_add_devices(devs, ARRAY_SIZE(devs));
199}
200
201arch_initcall(rpc_init);
202
203static void rpc_restart(enum reboot_mode mode, const char *cmd)
204{
205	iomd_writeb(0, IOMD_ROMCR0);
206
207	/*
208	 * Jump into the ROM
209	 */
210	soft_restart(0);
211}
212
213void ioc_timer_init(void);
214
215MACHINE_START(RISCPC, "Acorn-RiscPC")
216	/* Maintainer: Russell King */
217	.atag_offset	= 0x100,
218	.reserve_lp0	= 1,
219	.reserve_lp1	= 1,
220	.map_io		= rpc_map_io,
221	.init_irq	= rpc_init_irq,
222	.init_time	= ioc_timer_init,
223	.restart	= rpc_restart,
224MACHINE_END
225