1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * arch/sh/drivers/superhyway/ops-sh4-202.c
4  *
5  * SuperHyway bus support for SH4-202
6  *
7  * Copyright (C) 2005  Paul Mundt
8  */
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/superhyway.h>
12 #include <linux/string.h>
13 #include <asm/addrspace.h>
14 #include <asm/io.h>
15 
16 #define PHYS_EMI_CBLOCK		P4SEGADDR(0x1ec00000)
17 #define PHYS_EMI_DBLOCK		P4SEGADDR(0x08000000)
18 #define PHYS_FEMI_CBLOCK	P4SEGADDR(0x1f800000)
19 #define PHYS_FEMI_DBLOCK	P4SEGADDR(0x00000000)
20 
21 #define PHYS_EPBR_BLOCK		P4SEGADDR(0x1de00000)
22 #define PHYS_DMAC_BLOCK		P4SEGADDR(0x1fa00000)
23 #define PHYS_PBR_BLOCK		P4SEGADDR(0x1fc00000)
24 
25 static struct resource emi_resources[] = {
26 	[0] = {
27 		.start	= PHYS_EMI_CBLOCK,
28 		.end	= PHYS_EMI_CBLOCK + 0x00300000 - 1,
29 		.flags	= IORESOURCE_MEM,
30 	},
31 	[1] = {
32 		.start	= PHYS_EMI_DBLOCK,
33 		.end	= PHYS_EMI_DBLOCK + 0x08000000 - 1,
34 		.flags	= IORESOURCE_MEM,
35 	},
36 };
37 
38 static struct superhyway_device emi_device = {
39 	.name		= "emi",
40 	.num_resources	= ARRAY_SIZE(emi_resources),
41 	.resource	= emi_resources,
42 };
43 
44 static struct resource femi_resources[] = {
45 	[0] = {
46 		.start	= PHYS_FEMI_CBLOCK,
47 		.end	= PHYS_FEMI_CBLOCK + 0x00100000 - 1,
48 		.flags	= IORESOURCE_MEM,
49 	},
50 	[1] = {
51 		.start	= PHYS_FEMI_DBLOCK,
52 		.end	= PHYS_FEMI_DBLOCK + 0x08000000 - 1,
53 		.flags	= IORESOURCE_MEM,
54 	},
55 };
56 
57 static struct superhyway_device femi_device = {
58 	.name		= "femi",
59 	.num_resources	= ARRAY_SIZE(femi_resources),
60 	.resource	= femi_resources,
61 };
62 
63 static struct resource epbr_resources[] = {
64 	[0] = {
65 		.start	= P4SEGADDR(0x1e7ffff8),
66 		.end	= P4SEGADDR(0x1e7ffff8 + (sizeof(u32) * 2) - 1),
67 		.flags	= IORESOURCE_MEM,
68 	},
69 	[1] = {
70 		.start	= PHYS_EPBR_BLOCK,
71 		.end	= PHYS_EPBR_BLOCK + 0x00a00000 - 1,
72 		.flags	= IORESOURCE_MEM,
73 	},
74 };
75 
76 static struct superhyway_device epbr_device = {
77 	.name		= "epbr",
78 	.num_resources	= ARRAY_SIZE(epbr_resources),
79 	.resource	= epbr_resources,
80 };
81 
82 static struct resource dmac_resource = {
83 	.start	= PHYS_DMAC_BLOCK,
84 	.end	= PHYS_DMAC_BLOCK + 0x00100000 - 1,
85 	.flags	= IORESOURCE_MEM,
86 };
87 
88 static struct superhyway_device dmac_device = {
89 	.name		= "dmac",
90 	.num_resources	= 1,
91 	.resource	= &dmac_resource,
92 };
93 
94 static struct resource pbr_resources[] = {
95 	[0] = {
96 		.start	= P4SEGADDR(0x1ffffff8),
97 		.end	= P4SEGADDR(0x1ffffff8 + (sizeof(u32) * 2) - 1),
98 		.flags	= IORESOURCE_MEM,
99 	},
100 	[1] = {
101 		.start	= PHYS_PBR_BLOCK,
102 		.end	= PHYS_PBR_BLOCK + 0x00400000 - (sizeof(u32) * 2) - 1,
103 		.flags	= IORESOURCE_MEM,
104 	},
105 };
106 
107 static struct superhyway_device pbr_device = {
108 	.name		= "pbr",
109 	.num_resources	= ARRAY_SIZE(pbr_resources),
110 	.resource	= pbr_resources,
111 };
112 
113 static struct superhyway_device *sh4202_devices[] __initdata = {
114 	&emi_device, &femi_device, &epbr_device, &dmac_device, &pbr_device,
115 };
116 
sh4202_read_vcr(unsigned long base,struct superhyway_vcr_info * vcr)117 static int sh4202_read_vcr(unsigned long base, struct superhyway_vcr_info *vcr)
118 {
119 	u32 vcrh, vcrl;
120 	u64 tmp;
121 
122 	/*
123 	 * XXX: Even though the SH4-202 Evaluation Device documentation
124 	 * indicates that VCRL is mapped first with VCRH at a + 0x04
125 	 * offset, the opposite seems to be true.
126 	 *
127 	 * Some modules (PBR and ePBR for instance) also appear to have
128 	 * VCRL/VCRH flipped in the documentation, but on the SH4-202
129 	 * itself it appears that these are all consistently mapped with
130 	 * VCRH preceding VCRL.
131 	 *
132 	 * Do not trust the documentation, for it is evil.
133 	 */
134 	vcrh = __raw_readl(base);
135 	vcrl = __raw_readl(base + sizeof(u32));
136 
137 	tmp = ((u64)vcrh << 32) | vcrl;
138 	memcpy(vcr, &tmp, sizeof(u64));
139 
140 	return 0;
141 }
142 
sh4202_write_vcr(unsigned long base,struct superhyway_vcr_info vcr)143 static int sh4202_write_vcr(unsigned long base, struct superhyway_vcr_info vcr)
144 {
145 	u64 tmp = *(u64 *)&vcr;
146 
147 	__raw_writel((tmp >> 32) & 0xffffffff, base);
148 	__raw_writel(tmp & 0xffffffff, base + sizeof(u32));
149 
150 	return 0;
151 }
152 
153 static struct superhyway_ops sh4202_superhyway_ops = {
154 	.read_vcr	= sh4202_read_vcr,
155 	.write_vcr	= sh4202_write_vcr,
156 };
157 
158 struct superhyway_bus superhyway_channels[] = {
159 	{ &sh4202_superhyway_ops, },
160 	{ 0, },
161 };
162 
superhyway_scan_bus(struct superhyway_bus * bus)163 int __init superhyway_scan_bus(struct superhyway_bus *bus)
164 {
165 	return superhyway_add_devices(bus, sh4202_devices,
166 				      ARRAY_SIZE(sh4202_devices));
167 }
168 
169