Oliver Hartkopp | fd734c6 | 2011-09-23 06:59:48 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Sebastian Haas (initial chardev implementation) |
| 3 | * Copyright (C) 2010 Markus Plessing <plessing@ems-wuensche.com> |
| 4 | * Rework for mainline by Oliver Hartkopp <socketcan@hartkopp.net> |
| 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 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/netdevice.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/io.h> |
| 22 | #include <pcmcia/cistpl.h> |
| 23 | #include <pcmcia/ds.h> |
| 24 | #include <linux/can.h> |
| 25 | #include <linux/can/dev.h> |
| 26 | #include "sja1000.h" |
| 27 | |
| 28 | #define DRV_NAME "ems_pcmcia" |
| 29 | |
| 30 | MODULE_AUTHOR("Markus Plessing <plessing@ems-wuensche.com>"); |
| 31 | MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-CARD cards"); |
| 32 | MODULE_SUPPORTED_DEVICE("EMS CPC-CARD CAN card"); |
| 33 | MODULE_LICENSE("GPL v2"); |
| 34 | |
| 35 | #define EMS_PCMCIA_MAX_CHAN 2 |
| 36 | |
| 37 | struct ems_pcmcia_card { |
| 38 | int channels; |
| 39 | struct pcmcia_device *pcmcia_dev; |
| 40 | struct net_device *net_dev[EMS_PCMCIA_MAX_CHAN]; |
| 41 | void __iomem *base_addr; |
| 42 | }; |
| 43 | |
| 44 | #define EMS_PCMCIA_CAN_CLOCK (16000000 / 2) |
| 45 | |
| 46 | /* |
| 47 | * The board configuration is probably following: |
| 48 | * RX1 is connected to ground. |
| 49 | * TX1 is not connected. |
| 50 | * CLKO is not connected. |
| 51 | * Setting the OCR register to 0xDA is a good idea. |
| 52 | * This means normal output mode , push-pull and the correct polarity. |
| 53 | */ |
| 54 | #define EMS_PCMCIA_OCR (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL) |
| 55 | |
| 56 | /* |
| 57 | * In the CDR register, you should set CBP to 1. |
| 58 | * You will probably also want to set the clock divider value to 7 |
| 59 | * (meaning direct oscillator output) because the second SJA1000 chip |
| 60 | * is driven by the first one CLKOUT output. |
| 61 | */ |
| 62 | #define EMS_PCMCIA_CDR (CDR_CBP | CDR_CLKOUT_MASK) |
| 63 | #define EMS_PCMCIA_MEM_SIZE 4096 /* Size of the remapped io-memory */ |
| 64 | #define EMS_PCMCIA_CAN_BASE_OFFSET 0x100 /* Offset where controllers starts */ |
| 65 | #define EMS_PCMCIA_CAN_CTRL_SIZE 0x80 /* Memory size for each controller */ |
| 66 | |
| 67 | #define EMS_CMD_RESET 0x00 /* Perform a reset of the card */ |
| 68 | #define EMS_CMD_MAP 0x03 /* Map CAN controllers into card' memory */ |
| 69 | #define EMS_CMD_UMAP 0x02 /* Unmap CAN controllers from card' memory */ |
| 70 | |
| 71 | static struct pcmcia_device_id ems_pcmcia_tbl[] = { |
| 72 | PCMCIA_DEVICE_PROD_ID123("EMS_T_W", "CPC-Card", "V2.0", 0xeab1ea23, |
| 73 | 0xa338573f, 0xe4575800), |
| 74 | PCMCIA_DEVICE_NULL, |
| 75 | }; |
| 76 | |
| 77 | MODULE_DEVICE_TABLE(pcmcia, ems_pcmcia_tbl); |
| 78 | |
| 79 | static u8 ems_pcmcia_read_reg(const struct sja1000_priv *priv, int port) |
| 80 | { |
| 81 | return readb(priv->reg_base + port); |
| 82 | } |
| 83 | |
| 84 | static void ems_pcmcia_write_reg(const struct sja1000_priv *priv, int port, |
| 85 | u8 val) |
| 86 | { |
| 87 | writeb(val, priv->reg_base + port); |
| 88 | } |
| 89 | |
| 90 | static irqreturn_t ems_pcmcia_interrupt(int irq, void *dev_id) |
| 91 | { |
| 92 | struct ems_pcmcia_card *card = dev_id; |
| 93 | struct net_device *dev; |
| 94 | irqreturn_t retval = IRQ_NONE; |
| 95 | int i, again; |
| 96 | |
| 97 | /* Card not present */ |
| 98 | if (readw(card->base_addr) != 0xAA55) |
| 99 | return IRQ_HANDLED; |
| 100 | |
| 101 | do { |
| 102 | again = 0; |
| 103 | |
| 104 | /* Check interrupt for each channel */ |
| 105 | for (i = 0; i < card->channels; i++) { |
| 106 | dev = card->net_dev[i]; |
| 107 | if (!dev) |
| 108 | continue; |
| 109 | |
| 110 | if (sja1000_interrupt(irq, dev) == IRQ_HANDLED) |
| 111 | again = 1; |
| 112 | } |
| 113 | /* At least one channel handled the interrupt */ |
| 114 | if (again) |
| 115 | retval = IRQ_HANDLED; |
| 116 | |
| 117 | } while (again); |
| 118 | |
| 119 | return retval; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Check if a CAN controller is present at the specified location |
| 124 | * by trying to set 'em into the PeliCAN mode |
| 125 | */ |
| 126 | static inline int ems_pcmcia_check_chan(struct sja1000_priv *priv) |
| 127 | { |
| 128 | /* Make sure SJA1000 is in reset mode */ |
| 129 | ems_pcmcia_write_reg(priv, REG_MOD, 1); |
| 130 | ems_pcmcia_write_reg(priv, REG_CDR, CDR_PELICAN); |
| 131 | |
| 132 | /* read reset-values */ |
| 133 | if (ems_pcmcia_read_reg(priv, REG_CDR) == CDR_PELICAN) |
| 134 | return 1; |
| 135 | |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | static void ems_pcmcia_del_card(struct pcmcia_device *pdev) |
| 140 | { |
| 141 | struct ems_pcmcia_card *card = pdev->priv; |
| 142 | struct net_device *dev; |
| 143 | int i; |
| 144 | |
| 145 | free_irq(pdev->irq, card); |
| 146 | |
| 147 | for (i = 0; i < card->channels; i++) { |
| 148 | dev = card->net_dev[i]; |
| 149 | if (!dev) |
| 150 | continue; |
| 151 | |
| 152 | printk(KERN_INFO "%s: removing %s on channel #%d\n", |
| 153 | DRV_NAME, dev->name, i); |
| 154 | unregister_sja1000dev(dev); |
| 155 | free_sja1000dev(dev); |
| 156 | } |
| 157 | |
| 158 | writeb(EMS_CMD_UMAP, card->base_addr); |
| 159 | iounmap(card->base_addr); |
| 160 | kfree(card); |
| 161 | |
| 162 | pdev->priv = NULL; |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * Probe PCI device for EMS CAN signature and register each available |
| 167 | * CAN channel to SJA1000 Socket-CAN subsystem. |
| 168 | */ |
Greg Kroah-Hartman | 1dd06ae | 2012-12-06 14:30:56 +0000 | [diff] [blame] | 169 | static int ems_pcmcia_add_card(struct pcmcia_device *pdev, unsigned long base) |
Oliver Hartkopp | fd734c6 | 2011-09-23 06:59:48 +0000 | [diff] [blame] | 170 | { |
| 171 | struct sja1000_priv *priv; |
| 172 | struct net_device *dev; |
| 173 | struct ems_pcmcia_card *card; |
| 174 | int err, i; |
| 175 | |
| 176 | /* Allocating card structures to hold addresses, ... */ |
| 177 | card = kzalloc(sizeof(struct ems_pcmcia_card), GFP_KERNEL); |
| 178 | if (!card) |
| 179 | return -ENOMEM; |
| 180 | |
| 181 | pdev->priv = card; |
| 182 | card->channels = 0; |
| 183 | |
| 184 | card->base_addr = ioremap(base, EMS_PCMCIA_MEM_SIZE); |
| 185 | if (!card->base_addr) { |
| 186 | err = -ENOMEM; |
| 187 | goto failure_cleanup; |
| 188 | } |
| 189 | |
| 190 | /* Check for unique EMS CAN signature */ |
| 191 | if (readw(card->base_addr) != 0xAA55) { |
| 192 | err = -ENODEV; |
| 193 | goto failure_cleanup; |
| 194 | } |
| 195 | |
| 196 | /* Request board reset */ |
| 197 | writeb(EMS_CMD_RESET, card->base_addr); |
| 198 | |
| 199 | /* Make sure CAN controllers are mapped into card's memory space */ |
| 200 | writeb(EMS_CMD_MAP, card->base_addr); |
| 201 | |
| 202 | /* Detect available channels */ |
| 203 | for (i = 0; i < EMS_PCMCIA_MAX_CHAN; i++) { |
| 204 | dev = alloc_sja1000dev(0); |
| 205 | if (!dev) { |
| 206 | err = -ENOMEM; |
| 207 | goto failure_cleanup; |
| 208 | } |
| 209 | |
| 210 | card->net_dev[i] = dev; |
| 211 | priv = netdev_priv(dev); |
| 212 | priv->priv = card; |
| 213 | SET_NETDEV_DEV(dev, &pdev->dev); |
| 214 | |
| 215 | priv->irq_flags = IRQF_SHARED; |
| 216 | dev->irq = pdev->irq; |
| 217 | priv->reg_base = card->base_addr + EMS_PCMCIA_CAN_BASE_OFFSET + |
| 218 | (i * EMS_PCMCIA_CAN_CTRL_SIZE); |
| 219 | |
| 220 | /* Check if channel is present */ |
| 221 | if (ems_pcmcia_check_chan(priv)) { |
| 222 | priv->read_reg = ems_pcmcia_read_reg; |
| 223 | priv->write_reg = ems_pcmcia_write_reg; |
| 224 | priv->can.clock.freq = EMS_PCMCIA_CAN_CLOCK; |
| 225 | priv->ocr = EMS_PCMCIA_OCR; |
| 226 | priv->cdr = EMS_PCMCIA_CDR; |
| 227 | priv->flags |= SJA1000_CUSTOM_IRQ_HANDLER; |
| 228 | |
| 229 | /* Register SJA1000 device */ |
| 230 | err = register_sja1000dev(dev); |
| 231 | if (err) { |
| 232 | free_sja1000dev(dev); |
| 233 | goto failure_cleanup; |
| 234 | } |
| 235 | |
| 236 | card->channels++; |
| 237 | |
| 238 | printk(KERN_INFO "%s: registered %s on channel " |
| 239 | "#%d at 0x%p, irq %d\n", DRV_NAME, dev->name, |
| 240 | i, priv->reg_base, dev->irq); |
| 241 | } else |
| 242 | free_sja1000dev(dev); |
| 243 | } |
| 244 | |
| 245 | err = request_irq(dev->irq, &ems_pcmcia_interrupt, IRQF_SHARED, |
| 246 | DRV_NAME, card); |
| 247 | if (!err) |
| 248 | return 0; |
| 249 | |
| 250 | failure_cleanup: |
| 251 | ems_pcmcia_del_card(pdev); |
| 252 | return err; |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Setup PCMCIA socket and probe for EMS CPC-CARD |
| 257 | */ |
Bill Pemberton | 3c8ac0f | 2012-12-03 09:22:44 -0500 | [diff] [blame] | 258 | static int ems_pcmcia_probe(struct pcmcia_device *dev) |
Oliver Hartkopp | fd734c6 | 2011-09-23 06:59:48 +0000 | [diff] [blame] | 259 | { |
| 260 | int csval; |
| 261 | |
| 262 | /* General socket configuration */ |
| 263 | dev->config_flags |= CONF_ENABLE_IRQ; |
| 264 | dev->config_index = 1; |
| 265 | dev->config_regs = PRESENT_OPTION; |
| 266 | |
| 267 | /* The io structure describes IO port mapping */ |
| 268 | dev->resource[0]->end = 16; |
| 269 | dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8; |
| 270 | dev->resource[1]->end = 16; |
| 271 | dev->resource[1]->flags |= IO_DATA_PATH_WIDTH_16; |
| 272 | dev->io_lines = 5; |
| 273 | |
| 274 | /* Allocate a memory window */ |
| 275 | dev->resource[2]->flags = |
| 276 | (WIN_DATA_WIDTH_8 | WIN_MEMORY_TYPE_CM | WIN_ENABLE); |
| 277 | dev->resource[2]->start = dev->resource[2]->end = 0; |
| 278 | |
| 279 | csval = pcmcia_request_window(dev, dev->resource[2], 0); |
| 280 | if (csval) { |
| 281 | dev_err(&dev->dev, "pcmcia_request_window failed (err=%d)\n", |
| 282 | csval); |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | csval = pcmcia_map_mem_page(dev, dev->resource[2], dev->config_base); |
| 287 | if (csval) { |
| 288 | dev_err(&dev->dev, "pcmcia_map_mem_page failed (err=%d)\n", |
| 289 | csval); |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | csval = pcmcia_enable_device(dev); |
| 294 | if (csval) { |
| 295 | dev_err(&dev->dev, "pcmcia_enable_device failed (err=%d)\n", |
| 296 | csval); |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | ems_pcmcia_add_card(dev, dev->resource[2]->start); |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * Release claimed resources |
| 306 | */ |
| 307 | static void ems_pcmcia_remove(struct pcmcia_device *dev) |
| 308 | { |
| 309 | ems_pcmcia_del_card(dev); |
| 310 | pcmcia_disable_device(dev); |
| 311 | } |
| 312 | |
| 313 | static struct pcmcia_driver ems_pcmcia_driver = { |
| 314 | .name = DRV_NAME, |
| 315 | .probe = ems_pcmcia_probe, |
| 316 | .remove = ems_pcmcia_remove, |
| 317 | .id_table = ems_pcmcia_tbl, |
| 318 | }; |
H Hartley Sweeten | fdd3f29 | 2013-03-06 11:27:43 -0700 | [diff] [blame^] | 319 | module_pcmcia_driver(ems_pcmcia_driver); |