arch/sh/drivers/superhyway/ops-sh4-202.c

   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
 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
 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
 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