Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Driver for CC770 and AN82527 CAN controllers on the platform bus |
| 3 | * |
| 4 | * Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the version 2 of the GNU General Public License |
| 8 | * as published by the Free Software Foundation |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | /* |
| 17 | * If platform data are used you should have similar definitions |
| 18 | * in your board-specific code: |
| 19 | * |
| 20 | * static struct cc770_platform_data myboard_cc770_pdata = { |
| 21 | * .osc_freq = 16000000, |
| 22 | * .cir = 0x41, |
| 23 | * .cor = 0x20, |
| 24 | * .bcr = 0x40, |
| 25 | * }; |
| 26 | * |
| 27 | * Please see include/linux/can/platform/cc770.h for description of |
| 28 | * above fields. |
| 29 | * |
| 30 | * If the device tree is used, you need a CAN node definition in your |
| 31 | * DTS file similar to: |
| 32 | * |
| 33 | * can@3,100 { |
| 34 | * compatible = "bosch,cc770"; |
| 35 | * reg = <3 0x100 0x80>; |
| 36 | * interrupts = <2 0>; |
| 37 | * interrupt-parent = <&mpic>; |
| 38 | * bosch,external-clock-frequency = <16000000>; |
| 39 | * }; |
| 40 | * |
| 41 | * See "Documentation/devicetree/bindings/net/can/cc770.txt" for further |
| 42 | * information. |
| 43 | */ |
| 44 | |
| 45 | #include <linux/kernel.h> |
| 46 | #include <linux/module.h> |
| 47 | #include <linux/interrupt.h> |
| 48 | #include <linux/netdevice.h> |
| 49 | #include <linux/delay.h> |
| 50 | #include <linux/platform_device.h> |
| 51 | #include <linux/of.h> |
| 52 | #include <linux/can.h> |
| 53 | #include <linux/can/dev.h> |
| 54 | #include <linux/can/platform/cc770.h> |
| 55 | |
| 56 | #include "cc770.h" |
| 57 | |
| 58 | #define DRV_NAME "cc770_platform" |
| 59 | |
| 60 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); |
| 61 | MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the platform bus"); |
| 62 | MODULE_LICENSE("GPL v2"); |
Marc Kleine-Budde | f190a50 | 2012-10-12 09:51:19 +0200 | [diff] [blame] | 63 | MODULE_ALIAS("platform:" DRV_NAME); |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 64 | |
| 65 | #define CC770_PLATFORM_CAN_CLOCK 16000000 |
| 66 | |
| 67 | static u8 cc770_platform_read_reg(const struct cc770_priv *priv, int reg) |
| 68 | { |
| 69 | return ioread8(priv->reg_base + reg); |
| 70 | } |
| 71 | |
| 72 | static void cc770_platform_write_reg(const struct cc770_priv *priv, int reg, |
| 73 | u8 val) |
| 74 | { |
| 75 | iowrite8(val, priv->reg_base + reg); |
| 76 | } |
| 77 | |
Bill Pemberton | 3c8ac0f | 2012-12-03 09:22:44 -0500 | [diff] [blame] | 78 | static int cc770_get_of_node_data(struct platform_device *pdev, |
Greg Kroah-Hartman | 1dd06ae | 2012-12-06 14:30:56 +0000 | [diff] [blame] | 79 | struct cc770_priv *priv) |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 80 | { |
| 81 | struct device_node *np = pdev->dev.of_node; |
| 82 | const u32 *prop; |
| 83 | int prop_size; |
| 84 | u32 clkext; |
| 85 | |
| 86 | prop = of_get_property(np, "bosch,external-clock-frequency", |
| 87 | &prop_size); |
| 88 | if (prop && (prop_size == sizeof(u32))) |
| 89 | clkext = *prop; |
| 90 | else |
| 91 | clkext = CC770_PLATFORM_CAN_CLOCK; /* default */ |
| 92 | priv->can.clock.freq = clkext; |
| 93 | |
| 94 | /* The system clock may not exceed 10 MHz */ |
| 95 | if (priv->can.clock.freq > 10000000) { |
| 96 | priv->cpu_interface |= CPUIF_DSC; |
| 97 | priv->can.clock.freq /= 2; |
| 98 | } |
| 99 | |
| 100 | /* The memory clock may not exceed 8 MHz */ |
| 101 | if (priv->can.clock.freq > 8000000) |
| 102 | priv->cpu_interface |= CPUIF_DMC; |
| 103 | |
| 104 | if (of_get_property(np, "bosch,divide-memory-clock", NULL)) |
| 105 | priv->cpu_interface |= CPUIF_DMC; |
| 106 | if (of_get_property(np, "bosch,iso-low-speed-mux", NULL)) |
| 107 | priv->cpu_interface |= CPUIF_MUX; |
| 108 | |
| 109 | if (!of_get_property(np, "bosch,no-comperator-bypass", NULL)) |
| 110 | priv->bus_config |= BUSCFG_CBY; |
| 111 | if (of_get_property(np, "bosch,disconnect-rx0-input", NULL)) |
| 112 | priv->bus_config |= BUSCFG_DR0; |
| 113 | if (of_get_property(np, "bosch,disconnect-rx1-input", NULL)) |
| 114 | priv->bus_config |= BUSCFG_DR1; |
| 115 | if (of_get_property(np, "bosch,disconnect-tx1-output", NULL)) |
| 116 | priv->bus_config |= BUSCFG_DT1; |
| 117 | if (of_get_property(np, "bosch,polarity-dominant", NULL)) |
| 118 | priv->bus_config |= BUSCFG_POL; |
| 119 | |
| 120 | prop = of_get_property(np, "bosch,clock-out-frequency", &prop_size); |
| 121 | if (prop && (prop_size == sizeof(u32)) && *prop > 0) { |
| 122 | u32 cdv = clkext / *prop; |
| 123 | int slew; |
| 124 | |
| 125 | if (cdv > 0 && cdv < 16) { |
| 126 | priv->cpu_interface |= CPUIF_CEN; |
| 127 | priv->clkout |= (cdv - 1) & CLKOUT_CD_MASK; |
| 128 | |
| 129 | prop = of_get_property(np, "bosch,slew-rate", |
| 130 | &prop_size); |
| 131 | if (prop && (prop_size == sizeof(u32))) { |
| 132 | slew = *prop; |
| 133 | } else { |
| 134 | /* Determine default slew rate */ |
| 135 | slew = (CLKOUT_SL_MASK >> |
| 136 | CLKOUT_SL_SHIFT) - |
| 137 | ((cdv * clkext - 1) / 8000000); |
| 138 | if (slew < 0) |
| 139 | slew = 0; |
| 140 | } |
| 141 | priv->clkout |= (slew << CLKOUT_SL_SHIFT) & |
| 142 | CLKOUT_SL_MASK; |
| 143 | } else { |
| 144 | dev_dbg(&pdev->dev, "invalid clock-out-frequency\n"); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
Bill Pemberton | 3c8ac0f | 2012-12-03 09:22:44 -0500 | [diff] [blame] | 151 | static int cc770_get_platform_data(struct platform_device *pdev, |
Greg Kroah-Hartman | 1dd06ae | 2012-12-06 14:30:56 +0000 | [diff] [blame] | 152 | struct cc770_priv *priv) |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 153 | { |
| 154 | |
Jingoo Han | e19f030 | 2013-09-10 17:41:07 +0900 | [diff] [blame] | 155 | struct cc770_platform_data *pdata = dev_get_platdata(&pdev->dev); |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 156 | |
| 157 | priv->can.clock.freq = pdata->osc_freq; |
Joe Perches | dc605db | 2012-05-30 13:25:55 -0700 | [diff] [blame] | 158 | if (priv->cpu_interface & CPUIF_DSC) |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 159 | priv->can.clock.freq /= 2; |
| 160 | priv->clkout = pdata->cor; |
| 161 | priv->bus_config = pdata->bcr; |
| 162 | priv->cpu_interface = pdata->cir; |
| 163 | |
| 164 | return 0; |
| 165 | } |
| 166 | |
Bill Pemberton | 3c8ac0f | 2012-12-03 09:22:44 -0500 | [diff] [blame] | 167 | static int cc770_platform_probe(struct platform_device *pdev) |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 168 | { |
| 169 | struct net_device *dev; |
| 170 | struct cc770_priv *priv; |
| 171 | struct resource *mem; |
| 172 | resource_size_t mem_size; |
| 173 | void __iomem *base; |
| 174 | int err, irq; |
| 175 | |
| 176 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 177 | irq = platform_get_irq(pdev, 0); |
| 178 | if (!mem || irq <= 0) |
| 179 | return -ENODEV; |
| 180 | |
| 181 | mem_size = resource_size(mem); |
| 182 | if (!request_mem_region(mem->start, mem_size, pdev->name)) |
| 183 | return -EBUSY; |
| 184 | |
| 185 | base = ioremap(mem->start, mem_size); |
| 186 | if (!base) { |
| 187 | err = -ENOMEM; |
| 188 | goto exit_release_mem; |
| 189 | } |
| 190 | |
| 191 | dev = alloc_cc770dev(0); |
| 192 | if (!dev) { |
| 193 | err = -ENOMEM; |
| 194 | goto exit_unmap_mem; |
| 195 | } |
| 196 | |
| 197 | dev->irq = irq; |
| 198 | priv = netdev_priv(dev); |
| 199 | priv->read_reg = cc770_platform_read_reg; |
| 200 | priv->write_reg = cc770_platform_write_reg; |
| 201 | priv->irq_flags = IRQF_SHARED; |
| 202 | priv->reg_base = base; |
| 203 | |
| 204 | if (pdev->dev.of_node) |
| 205 | err = cc770_get_of_node_data(pdev, priv); |
Jingoo Han | e19f030 | 2013-09-10 17:41:07 +0900 | [diff] [blame] | 206 | else if (dev_get_platdata(&pdev->dev)) |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 207 | err = cc770_get_platform_data(pdev, priv); |
| 208 | else |
| 209 | err = -ENODEV; |
| 210 | if (err) |
| 211 | goto exit_free_cc770; |
| 212 | |
| 213 | dev_dbg(&pdev->dev, |
| 214 | "reg_base=0x%p irq=%d clock=%d cpu_interface=0x%02x " |
| 215 | "bus_config=0x%02x clkout=0x%02x\n", |
| 216 | priv->reg_base, dev->irq, priv->can.clock.freq, |
| 217 | priv->cpu_interface, priv->bus_config, priv->clkout); |
| 218 | |
Jingoo Han | 00e4bbc | 2013-05-23 19:47:58 +0900 | [diff] [blame] | 219 | platform_set_drvdata(pdev, dev); |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 220 | SET_NETDEV_DEV(dev, &pdev->dev); |
| 221 | |
| 222 | err = register_cc770dev(dev); |
| 223 | if (err) { |
| 224 | dev_err(&pdev->dev, |
| 225 | "couldn't register CC700 device (err=%d)\n", err); |
| 226 | goto exit_free_cc770; |
| 227 | } |
| 228 | |
| 229 | return 0; |
| 230 | |
| 231 | exit_free_cc770: |
| 232 | free_cc770dev(dev); |
| 233 | exit_unmap_mem: |
| 234 | iounmap(base); |
| 235 | exit_release_mem: |
| 236 | release_mem_region(mem->start, mem_size); |
| 237 | |
| 238 | return err; |
| 239 | } |
| 240 | |
Bill Pemberton | 3c8ac0f | 2012-12-03 09:22:44 -0500 | [diff] [blame] | 241 | static int cc770_platform_remove(struct platform_device *pdev) |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 242 | { |
Jingoo Han | 00e4bbc | 2013-05-23 19:47:58 +0900 | [diff] [blame] | 243 | struct net_device *dev = platform_get_drvdata(pdev); |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 244 | struct cc770_priv *priv = netdev_priv(dev); |
| 245 | struct resource *mem; |
| 246 | |
| 247 | unregister_cc770dev(dev); |
| 248 | iounmap(priv->reg_base); |
| 249 | free_cc770dev(dev); |
| 250 | |
| 251 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 252 | release_mem_region(mem->start, resource_size(mem)); |
| 253 | |
| 254 | return 0; |
| 255 | } |
| 256 | |
Bill Pemberton | 3c8ac0f | 2012-12-03 09:22:44 -0500 | [diff] [blame] | 257 | static struct of_device_id cc770_platform_table[] = { |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 258 | {.compatible = "bosch,cc770"}, /* CC770 from Bosch */ |
| 259 | {.compatible = "intc,82527"}, /* AN82527 from Intel CP */ |
| 260 | {}, |
| 261 | }; |
Marc Kleine-Budde | f190a50 | 2012-10-12 09:51:19 +0200 | [diff] [blame] | 262 | MODULE_DEVICE_TABLE(of, cc770_platform_table); |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 263 | |
| 264 | static struct platform_driver cc770_platform_driver = { |
| 265 | .driver = { |
| 266 | .name = DRV_NAME, |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 267 | .of_match_table = cc770_platform_table, |
| 268 | }, |
| 269 | .probe = cc770_platform_probe, |
Bill Pemberton | 3c8ac0f | 2012-12-03 09:22:44 -0500 | [diff] [blame] | 270 | .remove = cc770_platform_remove, |
Wolfgang Grandegger | e285e44 | 2011-11-30 23:41:20 +0000 | [diff] [blame] | 271 | }; |
| 272 | |
| 273 | module_platform_driver(cc770_platform_driver); |