Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com> |
| 3 | * Copyright (C) 2008 Markus Plessing <plessing@ems-wuensche.com> |
| 4 | * Copyright (C) 2008 Sebastian Haas <haas@ems-wuensche.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 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software Foundation, |
| 17 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/netdevice.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/pci.h> |
| 26 | #include <linux/can.h> |
| 27 | #include <linux/can/dev.h> |
| 28 | #include <linux/io.h> |
| 29 | |
| 30 | #include "sja1000.h" |
| 31 | |
| 32 | #define DRV_NAME "ems_pci" |
| 33 | |
| 34 | MODULE_AUTHOR("Sebastian Haas <haas@ems-wuenche.com>"); |
| 35 | MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-PCI/PCIe CAN cards"); |
| 36 | MODULE_SUPPORTED_DEVICE("EMS CPC-PCI/PCIe CAN card"); |
| 37 | MODULE_LICENSE("GPL v2"); |
| 38 | |
| 39 | #define EMS_PCI_MAX_CHAN 2 |
| 40 | |
| 41 | struct ems_pci_card { |
| 42 | int channels; |
| 43 | |
| 44 | struct pci_dev *pci_dev; |
| 45 | struct net_device *net_dev[EMS_PCI_MAX_CHAN]; |
| 46 | |
| 47 | void __iomem *conf_addr; |
| 48 | void __iomem *base_addr; |
| 49 | }; |
| 50 | |
| 51 | #define EMS_PCI_CAN_CLOCK (16000000 / 2) |
| 52 | |
| 53 | /* |
| 54 | * Register definitions and descriptions are from LinCAN 0.3.3. |
| 55 | * |
| 56 | * PSB4610 PITA-2 bridge control registers |
| 57 | */ |
| 58 | #define PITA2_ICR 0x00 /* Interrupt Control Register */ |
| 59 | #define PITA2_ICR_INT0 0x00000002 /* [RC] INT0 Active/Clear */ |
| 60 | #define PITA2_ICR_INT0_EN 0x00020000 /* [RW] Enable INT0 */ |
| 61 | |
| 62 | #define PITA2_MISC 0x1c /* Miscellaneous Register */ |
| 63 | #define PITA2_MISC_CONFIG 0x04000000 /* Multiplexed parallel interface */ |
| 64 | |
| 65 | /* |
| 66 | * The board configuration is probably following: |
| 67 | * RX1 is connected to ground. |
| 68 | * TX1 is not connected. |
| 69 | * CLKO is not connected. |
| 70 | * Setting the OCR register to 0xDA is a good idea. |
| 71 | * This means normal output mode , push-pull and the correct polarity. |
| 72 | */ |
| 73 | #define EMS_PCI_OCR (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL) |
| 74 | |
| 75 | /* |
| 76 | * In the CDR register, you should set CBP to 1. |
| 77 | * You will probably also want to set the clock divider value to 7 |
| 78 | * (meaning direct oscillator output) because the second SJA1000 chip |
| 79 | * is driven by the first one CLKOUT output. |
| 80 | */ |
| 81 | #define EMS_PCI_CDR (CDR_CBP | CDR_CLKOUT_MASK) |
| 82 | #define EMS_PCI_MEM_SIZE 4096 /* Size of the remapped io-memory */ |
| 83 | #define EMS_PCI_CAN_BASE_OFFSET 0x400 /* offset where the controllers starts */ |
| 84 | #define EMS_PCI_CAN_CTRL_SIZE 0x200 /* memory size for each controller */ |
| 85 | |
| 86 | #define EMS_PCI_PORT_BYTES 0x4 /* Each register occupies 4 bytes */ |
| 87 | |
| 88 | #define EMS_PCI_VENDOR_ID 0x110a /* PCI device and vendor ID */ |
| 89 | #define EMS_PCI_DEVICE_ID 0x2104 |
| 90 | |
| 91 | static struct pci_device_id ems_pci_tbl[] = { |
| 92 | {EMS_PCI_VENDOR_ID, EMS_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, |
| 93 | {0,} |
| 94 | }; |
| 95 | MODULE_DEVICE_TABLE(pci, ems_pci_tbl); |
| 96 | |
| 97 | /* |
| 98 | * Helper to read internal registers from card logic (not CAN) |
| 99 | */ |
| 100 | static u8 ems_pci_readb(struct ems_pci_card *card, unsigned int port) |
| 101 | { |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 102 | return readb(card->base_addr + (port * EMS_PCI_PORT_BYTES)); |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 103 | } |
| 104 | |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 105 | static u8 ems_pci_read_reg(const struct sja1000_priv *priv, int port) |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 106 | { |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 107 | return readb(priv->reg_base + (port * EMS_PCI_PORT_BYTES)); |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 108 | } |
| 109 | |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 110 | static void ems_pci_write_reg(const struct sja1000_priv *priv, int port, u8 val) |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 111 | { |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 112 | writeb(val, priv->reg_base + (port * EMS_PCI_PORT_BYTES)); |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 113 | } |
| 114 | |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 115 | static void ems_pci_post_irq(const struct sja1000_priv *priv) |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 116 | { |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 117 | struct ems_pci_card *card = (struct ems_pci_card *)priv->priv; |
| 118 | |
| 119 | /* reset int flag of pita */ |
| 120 | writel(PITA2_ICR_INT0_EN | PITA2_ICR_INT0, card->conf_addr |
| 121 | + PITA2_ICR); |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * Check if a CAN controller is present at the specified location |
| 126 | * by trying to set 'em into the PeliCAN mode |
| 127 | */ |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 128 | static inline int ems_pci_check_chan(const struct sja1000_priv *priv) |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 129 | { |
| 130 | unsigned char res; |
| 131 | |
| 132 | /* Make sure SJA1000 is in reset mode */ |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 133 | ems_pci_write_reg(priv, REG_MOD, 1); |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 134 | |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 135 | ems_pci_write_reg(priv, REG_CDR, CDR_PELICAN); |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 136 | |
| 137 | /* read reset-values */ |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 138 | res = ems_pci_read_reg(priv, REG_CDR); |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 139 | |
| 140 | if (res == CDR_PELICAN) |
| 141 | return 1; |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static void ems_pci_del_card(struct pci_dev *pdev) |
| 147 | { |
| 148 | struct ems_pci_card *card = pci_get_drvdata(pdev); |
| 149 | struct net_device *dev; |
| 150 | int i = 0; |
| 151 | |
| 152 | for (i = 0; i < card->channels; i++) { |
| 153 | dev = card->net_dev[i]; |
| 154 | |
| 155 | if (!dev) |
| 156 | continue; |
| 157 | |
| 158 | dev_info(&pdev->dev, "Removing %s.\n", dev->name); |
| 159 | unregister_sja1000dev(dev); |
| 160 | free_sja1000dev(dev); |
| 161 | } |
| 162 | |
| 163 | if (card->base_addr != NULL) |
| 164 | pci_iounmap(card->pci_dev, card->base_addr); |
| 165 | |
| 166 | if (card->conf_addr != NULL) |
| 167 | pci_iounmap(card->pci_dev, card->conf_addr); |
| 168 | |
| 169 | kfree(card); |
| 170 | |
| 171 | pci_disable_device(pdev); |
| 172 | pci_set_drvdata(pdev, NULL); |
| 173 | } |
| 174 | |
| 175 | static void ems_pci_card_reset(struct ems_pci_card *card) |
| 176 | { |
| 177 | /* Request board reset */ |
| 178 | writeb(0, card->base_addr); |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * Probe PCI device for EMS CAN signature and register each available |
| 183 | * CAN channel to SJA1000 Socket-CAN subsystem. |
| 184 | */ |
| 185 | static int __devinit ems_pci_add_card(struct pci_dev *pdev, |
| 186 | const struct pci_device_id *ent) |
| 187 | { |
| 188 | struct sja1000_priv *priv; |
| 189 | struct net_device *dev; |
| 190 | struct ems_pci_card *card; |
| 191 | int err, i; |
| 192 | |
| 193 | /* Enabling PCI device */ |
| 194 | if (pci_enable_device(pdev) < 0) { |
| 195 | dev_err(&pdev->dev, "Enabling PCI device failed\n"); |
| 196 | return -ENODEV; |
| 197 | } |
| 198 | |
| 199 | /* Allocating card structures to hold addresses, ... */ |
| 200 | card = kzalloc(sizeof(struct ems_pci_card), GFP_KERNEL); |
| 201 | if (card == NULL) { |
| 202 | dev_err(&pdev->dev, "Unable to allocate memory\n"); |
| 203 | pci_disable_device(pdev); |
| 204 | return -ENOMEM; |
| 205 | } |
| 206 | |
| 207 | pci_set_drvdata(pdev, card); |
| 208 | |
| 209 | card->pci_dev = pdev; |
| 210 | |
| 211 | card->channels = 0; |
| 212 | |
| 213 | /* Remap PITA configuration space, and controller memory area */ |
| 214 | card->conf_addr = pci_iomap(pdev, 0, EMS_PCI_MEM_SIZE); |
| 215 | if (card->conf_addr == NULL) { |
| 216 | err = -ENOMEM; |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 217 | goto failure_cleanup; |
| 218 | } |
| 219 | |
| 220 | card->base_addr = pci_iomap(pdev, 1, EMS_PCI_MEM_SIZE); |
| 221 | if (card->base_addr == NULL) { |
| 222 | err = -ENOMEM; |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 223 | goto failure_cleanup; |
| 224 | } |
| 225 | |
| 226 | /* Configure PITA-2 parallel interface (enable MUX) */ |
| 227 | writel(PITA2_MISC_CONFIG, card->conf_addr + PITA2_MISC); |
| 228 | |
| 229 | /* Check for unique EMS CAN signature */ |
| 230 | if (ems_pci_readb(card, 0) != 0x55 || |
| 231 | ems_pci_readb(card, 1) != 0xAA || |
| 232 | ems_pci_readb(card, 2) != 0x01 || |
| 233 | ems_pci_readb(card, 3) != 0xCB || |
| 234 | ems_pci_readb(card, 4) != 0x11) { |
| 235 | dev_err(&pdev->dev, "Not EMS Dr. Thomas Wuensche interface\n"); |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 236 | err = -ENODEV; |
| 237 | goto failure_cleanup; |
| 238 | } |
| 239 | |
| 240 | ems_pci_card_reset(card); |
| 241 | |
| 242 | /* Detect available channels */ |
| 243 | for (i = 0; i < EMS_PCI_MAX_CHAN; i++) { |
| 244 | dev = alloc_sja1000dev(0); |
| 245 | if (dev == NULL) { |
| 246 | err = -ENOMEM; |
| 247 | goto failure_cleanup; |
| 248 | } |
| 249 | |
| 250 | card->net_dev[i] = dev; |
| 251 | priv = netdev_priv(dev); |
| 252 | priv->priv = card; |
| 253 | priv->irq_flags = IRQF_SHARED; |
| 254 | |
| 255 | dev->irq = pdev->irq; |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 256 | priv->reg_base = card->base_addr + EMS_PCI_CAN_BASE_OFFSET |
| 257 | + (i * EMS_PCI_CAN_CTRL_SIZE); |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 258 | |
| 259 | /* Check if channel is present */ |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 260 | if (ems_pci_check_chan(priv)) { |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 261 | priv->read_reg = ems_pci_read_reg; |
| 262 | priv->write_reg = ems_pci_write_reg; |
| 263 | priv->post_irq = ems_pci_post_irq; |
| 264 | priv->can.clock.freq = EMS_PCI_CAN_CLOCK; |
| 265 | priv->ocr = EMS_PCI_OCR; |
| 266 | priv->cdr = EMS_PCI_CDR; |
| 267 | |
| 268 | SET_NETDEV_DEV(dev, &pdev->dev); |
| 269 | |
| 270 | /* Enable interrupts from card */ |
| 271 | writel(PITA2_ICR_INT0_EN, card->conf_addr + PITA2_ICR); |
| 272 | |
| 273 | /* Register SJA1000 device */ |
| 274 | err = register_sja1000dev(dev); |
| 275 | if (err) { |
| 276 | dev_err(&pdev->dev, "Registering device failed " |
| 277 | "(err=%d)\n", err); |
| 278 | free_sja1000dev(dev); |
| 279 | goto failure_cleanup; |
| 280 | } |
| 281 | |
| 282 | card->channels++; |
| 283 | |
Wolfgang Grandegger | 255a915 | 2009-05-30 07:55:49 +0000 | [diff] [blame] | 284 | dev_info(&pdev->dev, "Channel #%d at 0x%p, irq %d\n", |
| 285 | i + 1, priv->reg_base, dev->irq); |
Wolfgang Grandegger | a61a842 | 2009-05-15 23:39:32 +0000 | [diff] [blame] | 286 | } else { |
| 287 | free_sja1000dev(dev); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | return 0; |
| 292 | |
| 293 | failure_cleanup: |
| 294 | dev_err(&pdev->dev, "Error: %d. Cleaning Up.\n", err); |
| 295 | |
| 296 | ems_pci_del_card(pdev); |
| 297 | |
| 298 | return err; |
| 299 | } |
| 300 | |
| 301 | static struct pci_driver ems_pci_driver = { |
| 302 | .name = DRV_NAME, |
| 303 | .id_table = ems_pci_tbl, |
| 304 | .probe = ems_pci_add_card, |
| 305 | .remove = ems_pci_del_card, |
| 306 | }; |
| 307 | |
| 308 | static int __init ems_pci_init(void) |
| 309 | { |
| 310 | return pci_register_driver(&ems_pci_driver); |
| 311 | } |
| 312 | |
| 313 | static void __exit ems_pci_exit(void) |
| 314 | { |
| 315 | pci_unregister_driver(&ems_pci_driver); |
| 316 | } |
| 317 | |
| 318 | module_init(ems_pci_init); |
| 319 | module_exit(ems_pci_exit); |
| 320 | |