Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005 Sascha Hauer, Pengutronix |
| 3 | * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the version 2 of the GNU General Public License |
| 7 | * as published by the Free Software Foundation |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
Jeff Kirsher | 05780d9 | 2013-12-06 06:28:45 -0800 | [diff] [blame] | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 16 | */ |
| 17 | |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/netdevice.h> |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/pci.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/irq.h> |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 26 | #include <linux/can/dev.h> |
| 27 | #include <linux/can/platform/sja1000.h> |
| 28 | #include <linux/io.h> |
Florian Vaussard | 02729c3 | 2014-01-31 14:34:35 +0100 | [diff] [blame] | 29 | #include <linux/of.h> |
| 30 | #include <linux/of_irq.h> |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 31 | |
| 32 | #include "sja1000.h" |
| 33 | |
| 34 | #define DRV_NAME "sja1000_platform" |
Florian Vaussard | 02729c3 | 2014-01-31 14:34:35 +0100 | [diff] [blame] | 35 | #define SP_CAN_CLOCK (16000000 / 2) |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 36 | |
| 37 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); |
Florian Vaussard | 02729c3 | 2014-01-31 14:34:35 +0100 | [diff] [blame] | 38 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 39 | MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus"); |
Marc Kleine-Budde | d8c4386 | 2012-10-12 09:45:14 +0200 | [diff] [blame] | 40 | MODULE_ALIAS("platform:" DRV_NAME); |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 41 | MODULE_LICENSE("GPL v2"); |
| 42 | |
Yegor Yefremov | 986917b | 2010-03-19 00:50:44 +0000 | [diff] [blame] | 43 | static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg) |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 44 | { |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 45 | return ioread8(priv->reg_base + reg); |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 46 | } |
| 47 | |
Yegor Yefremov | 986917b | 2010-03-19 00:50:44 +0000 | [diff] [blame] | 48 | static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val) |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 49 | { |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 50 | iowrite8(val, priv->reg_base + reg); |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 51 | } |
| 52 | |
Yegor Yefremov | 986917b | 2010-03-19 00:50:44 +0000 | [diff] [blame] | 53 | static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg) |
| 54 | { |
| 55 | return ioread8(priv->reg_base + reg * 2); |
| 56 | } |
| 57 | |
| 58 | static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val) |
| 59 | { |
| 60 | iowrite8(val, priv->reg_base + reg * 2); |
| 61 | } |
| 62 | |
| 63 | static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg) |
| 64 | { |
| 65 | return ioread8(priv->reg_base + reg * 4); |
| 66 | } |
| 67 | |
| 68 | static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val) |
| 69 | { |
| 70 | iowrite8(val, priv->reg_base + reg * 4); |
| 71 | } |
| 72 | |
Florian Vaussard | 02729c3 | 2014-01-31 14:34:35 +0100 | [diff] [blame] | 73 | static void sp_populate(struct sja1000_priv *priv, |
| 74 | struct sja1000_platform_data *pdata, |
| 75 | unsigned long resource_mem_flags) |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 76 | { |
Wolfgang Grandegger | 56e6943b9 | 2010-05-17 22:39:48 -0700 | [diff] [blame] | 77 | /* The CAN clock frequency is half the oscillator clock frequency */ |
| 78 | priv->can.clock.freq = pdata->osc_freq / 2; |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 79 | priv->ocr = pdata->ocr; |
| 80 | priv->cdr = pdata->cdr; |
| 81 | |
Florian Vaussard | 02729c3 | 2014-01-31 14:34:35 +0100 | [diff] [blame] | 82 | switch (resource_mem_flags & IORESOURCE_MEM_TYPE_MASK) { |
Yegor Yefremov | 986917b | 2010-03-19 00:50:44 +0000 | [diff] [blame] | 83 | case IORESOURCE_MEM_32BIT: |
| 84 | priv->read_reg = sp_read_reg32; |
| 85 | priv->write_reg = sp_write_reg32; |
| 86 | break; |
| 87 | case IORESOURCE_MEM_16BIT: |
| 88 | priv->read_reg = sp_read_reg16; |
| 89 | priv->write_reg = sp_write_reg16; |
| 90 | break; |
| 91 | case IORESOURCE_MEM_8BIT: |
| 92 | default: |
| 93 | priv->read_reg = sp_read_reg8; |
| 94 | priv->write_reg = sp_write_reg8; |
| 95 | break; |
| 96 | } |
Florian Vaussard | 02729c3 | 2014-01-31 14:34:35 +0100 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of) |
| 100 | { |
| 101 | int err; |
| 102 | u32 prop; |
| 103 | |
Florian Vaussard | b18ec27 | 2014-01-31 14:34:37 +0100 | [diff] [blame] | 104 | err = of_property_read_u32(of, "reg-io-width", &prop); |
| 105 | if (err) |
| 106 | prop = 1; /* 8 bit is default */ |
| 107 | |
| 108 | switch (prop) { |
| 109 | case 4: |
| 110 | priv->read_reg = sp_read_reg32; |
| 111 | priv->write_reg = sp_write_reg32; |
| 112 | break; |
| 113 | case 2: |
| 114 | priv->read_reg = sp_read_reg16; |
| 115 | priv->write_reg = sp_write_reg16; |
| 116 | break; |
| 117 | case 1: /* fallthrough */ |
| 118 | default: |
| 119 | priv->read_reg = sp_read_reg8; |
| 120 | priv->write_reg = sp_write_reg8; |
| 121 | } |
Florian Vaussard | 02729c3 | 2014-01-31 14:34:35 +0100 | [diff] [blame] | 122 | |
| 123 | err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop); |
| 124 | if (!err) |
| 125 | priv->can.clock.freq = prop / 2; |
| 126 | else |
| 127 | priv->can.clock.freq = SP_CAN_CLOCK; /* default */ |
| 128 | |
| 129 | err = of_property_read_u32(of, "nxp,tx-output-mode", &prop); |
| 130 | if (!err) |
| 131 | priv->ocr |= prop & OCR_MODE_MASK; |
| 132 | else |
| 133 | priv->ocr |= OCR_MODE_NORMAL; /* default */ |
| 134 | |
| 135 | err = of_property_read_u32(of, "nxp,tx-output-config", &prop); |
| 136 | if (!err) |
| 137 | priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK; |
| 138 | else |
| 139 | priv->ocr |= OCR_TX0_PULLDOWN; /* default */ |
| 140 | |
| 141 | err = of_property_read_u32(of, "nxp,clock-out-frequency", &prop); |
| 142 | if (!err && prop) { |
| 143 | u32 divider = priv->can.clock.freq * 2 / prop; |
| 144 | |
| 145 | if (divider > 1) |
| 146 | priv->cdr |= divider / 2 - 1; |
| 147 | else |
| 148 | priv->cdr |= CDR_CLKOUT_MASK; |
| 149 | } else { |
| 150 | priv->cdr |= CDR_CLK_OFF; /* default */ |
| 151 | } |
| 152 | |
| 153 | if (!of_property_read_bool(of, "nxp,no-comparator-bypass")) |
| 154 | priv->cdr |= CDR_CBP; /* default */ |
| 155 | } |
| 156 | |
| 157 | static int sp_probe(struct platform_device *pdev) |
| 158 | { |
| 159 | int err, irq = 0; |
| 160 | void __iomem *addr; |
| 161 | struct net_device *dev; |
| 162 | struct sja1000_priv *priv; |
| 163 | struct resource *res_mem, *res_irq = NULL; |
| 164 | struct sja1000_platform_data *pdata; |
| 165 | struct device_node *of = pdev->dev.of_node; |
| 166 | |
| 167 | pdata = dev_get_platdata(&pdev->dev); |
| 168 | if (!pdata && !of) { |
| 169 | dev_err(&pdev->dev, "No platform data provided!\n"); |
| 170 | return -ENODEV; |
| 171 | } |
| 172 | |
| 173 | res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 174 | if (!res_mem) |
| 175 | return -ENODEV; |
| 176 | |
| 177 | if (!devm_request_mem_region(&pdev->dev, res_mem->start, |
| 178 | resource_size(res_mem), DRV_NAME)) |
| 179 | return -EBUSY; |
| 180 | |
| 181 | addr = devm_ioremap_nocache(&pdev->dev, res_mem->start, |
| 182 | resource_size(res_mem)); |
| 183 | if (!addr) |
| 184 | return -ENOMEM; |
| 185 | |
| 186 | if (of) |
| 187 | irq = irq_of_parse_and_map(of, 0); |
| 188 | else |
| 189 | res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| 190 | |
| 191 | if (!irq && !res_irq) |
| 192 | return -ENODEV; |
| 193 | |
| 194 | dev = alloc_sja1000dev(0); |
| 195 | if (!dev) |
| 196 | return -ENOMEM; |
| 197 | priv = netdev_priv(dev); |
| 198 | |
| 199 | if (res_irq) { |
| 200 | irq = res_irq->start; |
| 201 | priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK; |
| 202 | if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE) |
| 203 | priv->irq_flags |= IRQF_SHARED; |
| 204 | } else { |
| 205 | priv->irq_flags = IRQF_SHARED; |
| 206 | } |
| 207 | |
| 208 | dev->irq = irq; |
| 209 | priv->reg_base = addr; |
| 210 | |
| 211 | if (of) |
| 212 | sp_populate_of(priv, of); |
| 213 | else |
| 214 | sp_populate(priv, pdata, res_mem->flags); |
Yegor Yefremov | 986917b | 2010-03-19 00:50:44 +0000 | [diff] [blame] | 215 | |
Jingoo Han | 00e4bbc | 2013-05-23 19:47:58 +0900 | [diff] [blame] | 216 | platform_set_drvdata(pdev, dev); |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 217 | SET_NETDEV_DEV(dev, &pdev->dev); |
| 218 | |
| 219 | err = register_sja1000dev(dev); |
| 220 | if (err) { |
| 221 | dev_err(&pdev->dev, "registering %s failed (err=%d)\n", |
| 222 | DRV_NAME, err); |
| 223 | goto exit_free; |
| 224 | } |
| 225 | |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 226 | dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n", |
| 227 | DRV_NAME, priv->reg_base, dev->irq); |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 228 | return 0; |
| 229 | |
| 230 | exit_free: |
| 231 | free_sja1000dev(dev); |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 232 | return err; |
| 233 | } |
| 234 | |
| 235 | static int sp_remove(struct platform_device *pdev) |
| 236 | { |
Jingoo Han | 00e4bbc | 2013-05-23 19:47:58 +0900 | [diff] [blame] | 237 | struct net_device *dev = platform_get_drvdata(pdev); |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 238 | |
| 239 | unregister_sja1000dev(dev); |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 240 | free_sja1000dev(dev); |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
Florian Vaussard | 02729c3 | 2014-01-31 14:34:35 +0100 | [diff] [blame] | 245 | static struct of_device_id sp_of_table[] = { |
| 246 | {.compatible = "nxp,sja1000"}, |
| 247 | {}, |
| 248 | }; |
| 249 | MODULE_DEVICE_TABLE(of, sp_of_table); |
| 250 | |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 251 | static struct platform_driver sp_driver = { |
| 252 | .probe = sp_probe, |
| 253 | .remove = sp_remove, |
| 254 | .driver = { |
| 255 | .name = DRV_NAME, |
| 256 | .owner = THIS_MODULE, |
Florian Vaussard | 02729c3 | 2014-01-31 14:34:35 +0100 | [diff] [blame] | 257 | .of_match_table = sp_of_table, |
Wolfgang Grandegger | f534e52 | 2009-05-15 23:39:31 +0000 | [diff] [blame] | 258 | }, |
| 259 | }; |
| 260 | |
Axel Lin | 871d337 | 2011-11-27 15:42:31 +0000 | [diff] [blame] | 261 | module_platform_driver(sp_driver); |