1 /* 2 * B53 register access through memory mapped registers 3 * 4 * Copyright (C) 2012-2013 Jonas Gorski <jogo@openwrt.org> 5 * 6 * Permission to use, copy, modify, and/or distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/kconfig.h> 21 #include <linux/module.h> 22 #include <linux/io.h> 23 #include <linux/platform_device.h> 24 #include <linux/platform_data/b53.h> 25 26 #include "b53_priv.h" 27 28 struct b53_mmap_priv { 29 void __iomem *regs; 30 }; 31 32 static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val) 33 { 34 u8 __iomem *regs = dev->priv; 35 36 *val = readb(regs + (page << 8) + reg); 37 38 return 0; 39 } 40 41 static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val) 42 { 43 u8 __iomem *regs = dev->priv; 44 45 if (WARN_ON(reg % 2)) 46 return -EINVAL; 47 48 if (dev->pdata && dev->pdata->big_endian) 49 *val = ioread16be(regs + (page << 8) + reg); 50 else 51 *val = readw(regs + (page << 8) + reg); 52 53 return 0; 54 } 55 56 static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val) 57 { 58 u8 __iomem *regs = dev->priv; 59 60 if (WARN_ON(reg % 4)) 61 return -EINVAL; 62 63 if (dev->pdata && dev->pdata->big_endian) 64 *val = ioread32be(regs + (page << 8) + reg); 65 else 66 *val = readl(regs + (page << 8) + reg); 67 68 return 0; 69 } 70 71 static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val) 72 { 73 if (WARN_ON(reg % 2)) 74 return -EINVAL; 75 76 if (reg % 4) { 77 u16 lo; 78 u32 hi; 79 80 b53_mmap_read16(dev, page, reg, &lo); 81 b53_mmap_read32(dev, page, reg + 2, &hi); 82 83 *val = ((u64)hi << 16) | lo; 84 } else { 85 u32 lo; 86 u16 hi; 87 88 b53_mmap_read32(dev, page, reg, &lo); 89 b53_mmap_read16(dev, page, reg + 4, &hi); 90 91 *val = ((u64)hi << 32) | lo; 92 } 93 94 return 0; 95 } 96 97 static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val) 98 { 99 u32 hi, lo; 100 101 if (WARN_ON(reg % 4)) 102 return -EINVAL; 103 104 b53_mmap_read32(dev, page, reg, &lo); 105 b53_mmap_read32(dev, page, reg + 4, &hi); 106 107 *val = ((u64)hi << 32) | lo; 108 109 return 0; 110 } 111 112 static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value) 113 { 114 u8 __iomem *regs = dev->priv; 115 116 writeb(value, regs + (page << 8) + reg); 117 118 return 0; 119 } 120 121 static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg, 122 u16 value) 123 { 124 u8 __iomem *regs = dev->priv; 125 126 if (WARN_ON(reg % 2)) 127 return -EINVAL; 128 129 if (dev->pdata && dev->pdata->big_endian) 130 iowrite16be(value, regs + (page << 8) + reg); 131 else 132 writew(value, regs + (page << 8) + reg); 133 134 return 0; 135 } 136 137 static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg, 138 u32 value) 139 { 140 u8 __iomem *regs = dev->priv; 141 142 if (WARN_ON(reg % 4)) 143 return -EINVAL; 144 145 if (dev->pdata && dev->pdata->big_endian) 146 iowrite32be(value, regs + (page << 8) + reg); 147 else 148 writel(value, regs + (page << 8) + reg); 149 150 return 0; 151 } 152 153 static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg, 154 u64 value) 155 { 156 if (WARN_ON(reg % 2)) 157 return -EINVAL; 158 159 if (reg % 4) { 160 u32 hi = (u32)(value >> 16); 161 u16 lo = (u16)value; 162 163 b53_mmap_write16(dev, page, reg, lo); 164 b53_mmap_write32(dev, page, reg + 2, hi); 165 } else { 166 u16 hi = (u16)(value >> 32); 167 u32 lo = (u32)value; 168 169 b53_mmap_write32(dev, page, reg, lo); 170 b53_mmap_write16(dev, page, reg + 4, hi); 171 } 172 173 return 0; 174 } 175 176 static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg, 177 u64 value) 178 { 179 u32 hi, lo; 180 181 hi = upper_32_bits(value); 182 lo = lower_32_bits(value); 183 184 if (WARN_ON(reg % 4)) 185 return -EINVAL; 186 187 b53_mmap_write32(dev, page, reg, lo); 188 b53_mmap_write32(dev, page, reg + 4, hi); 189 190 return 0; 191 } 192 193 static struct b53_io_ops b53_mmap_ops = { 194 .read8 = b53_mmap_read8, 195 .read16 = b53_mmap_read16, 196 .read32 = b53_mmap_read32, 197 .read48 = b53_mmap_read48, 198 .read64 = b53_mmap_read64, 199 .write8 = b53_mmap_write8, 200 .write16 = b53_mmap_write16, 201 .write32 = b53_mmap_write32, 202 .write48 = b53_mmap_write48, 203 .write64 = b53_mmap_write64, 204 }; 205 206 static int b53_mmap_probe(struct platform_device *pdev) 207 { 208 struct b53_platform_data *pdata = pdev->dev.platform_data; 209 struct b53_device *dev; 210 211 if (!pdata) 212 return -EINVAL; 213 214 dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, pdata->regs); 215 if (!dev) 216 return -ENOMEM; 217 218 if (pdata) 219 dev->pdata = pdata; 220 221 platform_set_drvdata(pdev, dev); 222 223 return b53_switch_register(dev); 224 } 225 226 static int b53_mmap_remove(struct platform_device *pdev) 227 { 228 struct b53_device *dev = platform_get_drvdata(pdev); 229 230 if (dev) 231 b53_switch_remove(dev); 232 233 return 0; 234 } 235 236 static const struct of_device_id b53_mmap_of_table[] = { 237 { .compatible = "brcm,bcm3384-switch" }, 238 { .compatible = "brcm,bcm6328-switch" }, 239 { .compatible = "brcm,bcm6368-switch" }, 240 { .compatible = "brcm,bcm63xx-switch" }, 241 { /* sentinel */ }, 242 }; 243 244 static struct platform_driver b53_mmap_driver = { 245 .probe = b53_mmap_probe, 246 .remove = b53_mmap_remove, 247 .driver = { 248 .name = "b53-switch", 249 .of_match_table = b53_mmap_of_table, 250 }, 251 }; 252 253 module_platform_driver(b53_mmap_driver); 254 MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>"); 255 MODULE_DESCRIPTION("B53 MMAP access driver"); 256 MODULE_LICENSE("Dual BSD/GPL"); 257