Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / arch / sh / drivers / superhyway / ops-sh4-202.c
1 /*
2  * arch/sh/drivers/superhyway/ops-sh4-202.c
3  *
4  * SuperHyway bus support for SH4-202
5  *
6  * Copyright (C) 2005  Paul Mundt
7  *
8  * This file is subject to the terms and conditions of the GNU
9  * General Public License.  See the file "COPYING" in the main
10  * directory of this archive for more details.
11  */
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/superhyway.h>
15 #include <linux/string.h>
16 #include <asm/addrspace.h>
17 #include <asm/io.h>
18
19 #define PHYS_EMI_CBLOCK         P4SEGADDR(0x1ec00000)
20 #define PHYS_EMI_DBLOCK         P4SEGADDR(0x08000000)
21 #define PHYS_FEMI_CBLOCK        P4SEGADDR(0x1f800000)
22 #define PHYS_FEMI_DBLOCK        P4SEGADDR(0x00000000)
23
24 #define PHYS_EPBR_BLOCK         P4SEGADDR(0x1de00000)
25 #define PHYS_DMAC_BLOCK         P4SEGADDR(0x1fa00000)
26 #define PHYS_PBR_BLOCK          P4SEGADDR(0x1fc00000)
27
28 static struct resource emi_resources[] = {
29         [0] = {
30                 .start  = PHYS_EMI_CBLOCK,
31                 .end    = PHYS_EMI_CBLOCK + 0x00300000 - 1,
32                 .flags  = IORESOURCE_MEM,
33         },
34         [1] = {
35                 .start  = PHYS_EMI_DBLOCK,
36                 .end    = PHYS_EMI_DBLOCK + 0x08000000 - 1,
37                 .flags  = IORESOURCE_MEM,
38         },
39 };
40
41 static struct superhyway_device emi_device = {
42         .name           = "emi",
43         .num_resources  = ARRAY_SIZE(emi_resources),
44         .resource       = emi_resources,
45 };
46
47 static struct resource femi_resources[] = {
48         [0] = {
49                 .start  = PHYS_FEMI_CBLOCK,
50                 .end    = PHYS_FEMI_CBLOCK + 0x00100000 - 1,
51                 .flags  = IORESOURCE_MEM,
52         },
53         [1] = {
54                 .start  = PHYS_FEMI_DBLOCK,
55                 .end    = PHYS_FEMI_DBLOCK + 0x08000000 - 1,
56                 .flags  = IORESOURCE_MEM,
57         },
58 };
59
60 static struct superhyway_device femi_device = {
61         .name           = "femi",
62         .num_resources  = ARRAY_SIZE(femi_resources),
63         .resource       = femi_resources,
64 };
65
66 static struct resource epbr_resources[] = {
67         [0] = {
68                 .start  = P4SEGADDR(0x1e7ffff8),
69                 .end    = P4SEGADDR(0x1e7ffff8 + (sizeof(u32) * 2) - 1),
70                 .flags  = IORESOURCE_MEM,
71         },
72         [1] = {
73                 .start  = PHYS_EPBR_BLOCK,
74                 .end    = PHYS_EPBR_BLOCK + 0x00a00000 - 1,
75                 .flags  = IORESOURCE_MEM,
76         },
77 };
78
79 static struct superhyway_device epbr_device = {
80         .name           = "epbr",
81         .num_resources  = ARRAY_SIZE(epbr_resources),
82         .resource       = epbr_resources,
83 };
84
85 static struct resource dmac_resource = {
86         .start  = PHYS_DMAC_BLOCK,
87         .end    = PHYS_DMAC_BLOCK + 0x00100000 - 1,
88         .flags  = IORESOURCE_MEM,
89 };
90
91 static struct superhyway_device dmac_device = {
92         .name           = "dmac",
93         .num_resources  = 1,
94         .resource       = &dmac_resource,
95 };
96
97 static struct resource pbr_resources[] = {
98         [0] = {
99                 .start  = P4SEGADDR(0x1ffffff8),
100                 .end    = P4SEGADDR(0x1ffffff8 + (sizeof(u32) * 2) - 1),
101                 .flags  = IORESOURCE_MEM,
102         },
103         [1] = {
104                 .start  = PHYS_PBR_BLOCK,
105                 .end    = PHYS_PBR_BLOCK + 0x00400000 - (sizeof(u32) * 2) - 1,
106                 .flags  = IORESOURCE_MEM,
107         },
108 };
109
110 static struct superhyway_device pbr_device = {
111         .name           = "pbr",
112         .num_resources  = ARRAY_SIZE(pbr_resources),
113         .resource       = pbr_resources,
114 };
115
116 static struct superhyway_device *sh4202_devices[] __initdata = {
117         &emi_device, &femi_device, &epbr_device, &dmac_device, &pbr_device,
118 };
119
120 static int sh4202_read_vcr(unsigned long base, struct superhyway_vcr_info *vcr)
121 {
122         u32 vcrh, vcrl;
123         u64 tmp;
124
125         /*
126          * XXX: Even though the SH4-202 Evaluation Device documentation
127          * indicates that VCRL is mapped first with VCRH at a + 0x04
128          * offset, the opposite seems to be true.
129          *
130          * Some modules (PBR and ePBR for instance) also appear to have
131          * VCRL/VCRH flipped in the documentation, but on the SH4-202
132          * itself it appears that these are all consistently mapped with
133          * VCRH preceding VCRL.
134          *
135          * Do not trust the documentation, for it is evil.
136          */
137         vcrh = __raw_readl(base);
138         vcrl = __raw_readl(base + sizeof(u32));
139
140         tmp = ((u64)vcrh << 32) | vcrl;
141         memcpy(vcr, &tmp, sizeof(u64));
142
143         return 0;
144 }
145
146 static int sh4202_write_vcr(unsigned long base, struct superhyway_vcr_info vcr)
147 {
148         u64 tmp = *(u64 *)&vcr;
149
150         __raw_writel((tmp >> 32) & 0xffffffff, base);
151         __raw_writel(tmp & 0xffffffff, base + sizeof(u32));
152
153         return 0;
154 }
155
156 static struct superhyway_ops sh4202_superhyway_ops = {
157         .read_vcr       = sh4202_read_vcr,
158         .write_vcr      = sh4202_write_vcr,
159 };
160
161 struct superhyway_bus superhyway_channels[] = {
162         { &sh4202_superhyway_ops, },
163         { 0, },
164 };
165
166 int __init superhyway_scan_bus(struct superhyway_bus *bus)
167 {
168         return superhyway_add_devices(bus, sh4202_devices,
169                                       ARRAY_SIZE(sh4202_devices));
170 }
171