Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[pandora-kernel.git] / drivers / net / can / sja1000 / peak_pci.c
1 /*
2  * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
3  *
4  * Derived from the PCAN project file driver/src/pcan_pci.c:
5  *
6  * Copyright (C) 2001-2006  PEAK System-Technik GmbH
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the version 2 of the GNU General Public License
10  * as published by the Free Software Foundation
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software Foundation,
19  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */
21
22 #include <linux/kernel.h>
23 #include <linux/version.h>
24 #include <linux/module.h>
25 #include <linux/interrupt.h>
26 #include <linux/netdevice.h>
27 #include <linux/delay.h>
28 #include <linux/pci.h>
29 #include <linux/io.h>
30 #include <linux/can.h>
31 #include <linux/can/dev.h>
32
33 #include "sja1000.h"
34
35 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
36 MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI/PCIe cards");
37 MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe CAN card");
38 MODULE_LICENSE("GPL v2");
39
40 #define DRV_NAME  "peak_pci"
41
42 struct peak_pci_chan {
43         void __iomem *cfg_base;      /* Common for all channels */
44         struct net_device *next_dev; /* Chain of network devices */
45         u16 icr_mask;                /* Interrupt mask for fast ack */
46 };
47
48 #define PEAK_PCI_CAN_CLOCK      (16000000 / 2)
49
50 #define PEAK_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
51 #define PEAK_PCI_OCR            OCR_TX0_PUSHPULL
52
53 /*
54  * Important PITA registers
55  */
56 #define PITA_ICR                0x00    /* Interrupt control register */
57 #define PITA_GPIOICR            0x18    /* GPIO interface control register */
58 #define PITA_MISC               0x1C    /* Miscellaneous register */
59
60 #define PEAK_PCI_CFG_SIZE       0x1000  /* Size of the config PCI bar */
61 #define PEAK_PCI_CHAN_SIZE      0x0400  /* Size used by the channel */
62
63 #define PEAK_PCI_VENDOR_ID      0x001C  /* The PCI device and vendor IDs */
64 #define PEAK_PCI_DEVICE_ID      0x0001  /* for PCI/PCIe slot cards */
65
66 static const u16 peak_pci_icr_masks[] = {0x02, 0x01, 0x40, 0x80};
67
68 static DEFINE_PCI_DEVICE_TABLE(peak_pci_tbl) = {
69         {PEAK_PCI_VENDOR_ID, PEAK_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
70         {0,}
71 };
72
73 MODULE_DEVICE_TABLE(pci, peak_pci_tbl);
74
75 static u8 peak_pci_read_reg(const struct sja1000_priv *priv, int port)
76 {
77         return readb(priv->reg_base + (port << 2));
78 }
79
80 static void peak_pci_write_reg(const struct sja1000_priv *priv,
81                                int port, u8 val)
82 {
83         writeb(val, priv->reg_base + (port << 2));
84 }
85
86 static void peak_pci_post_irq(const struct sja1000_priv *priv)
87 {
88         struct peak_pci_chan *chan = priv->priv;
89         u16 icr;
90
91         /* Select and clear in PITA stored interrupt */
92         icr = readw(chan->cfg_base + PITA_ICR);
93         if (icr & chan->icr_mask)
94                 writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
95 }
96
97 static int __devinit peak_pci_probe(struct pci_dev *pdev,
98                                     const struct pci_device_id *ent)
99 {
100         struct sja1000_priv *priv;
101         struct peak_pci_chan *chan;
102         struct net_device *dev, *dev0 = NULL;
103         void __iomem *cfg_base, *reg_base;
104         u16 sub_sys_id, icr;
105         int i, err, channels;
106
107         err = pci_enable_device(pdev);
108         if (err)
109                 return err;
110
111         err = pci_request_regions(pdev, DRV_NAME);
112         if (err)
113                 goto failure_disable_pci;
114
115         err = pci_read_config_word(pdev, 0x2e, &sub_sys_id);
116         if (err)
117                 goto failure_release_regions;
118
119         dev_dbg(&pdev->dev, "probing device %04x:%04x:%04x\n",
120                 pdev->vendor, pdev->device, sub_sys_id);
121
122         err = pci_write_config_word(pdev, 0x44, 0);
123         if (err)
124                 goto failure_release_regions;
125
126         if (sub_sys_id >= 12)
127                 channels = 4;
128         else if (sub_sys_id >= 10)
129                 channels = 3;
130         else if (sub_sys_id >= 4)
131                 channels = 2;
132         else
133                 channels = 1;
134
135         cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE);
136         if (!cfg_base) {
137                 dev_err(&pdev->dev, "failed to map PCI resource #0\n");
138                 goto failure_release_regions;
139         }
140
141         reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels);
142         if (!reg_base) {
143                 dev_err(&pdev->dev, "failed to map PCI resource #1\n");
144                 goto failure_unmap_cfg_base;
145         }
146
147         /* Set GPIO control register */
148         writew(0x0005, cfg_base + PITA_GPIOICR + 2);
149         /* Enable all channels of this card */
150         writeb(0x00, cfg_base + PITA_GPIOICR);
151         /* Toggle reset */
152         writeb(0x05, cfg_base + PITA_MISC + 3);
153         mdelay(5);
154         /* Leave parport mux mode */
155         writeb(0x04, cfg_base + PITA_MISC + 3);
156
157         icr = readw(cfg_base + PITA_ICR + 2);
158
159         for (i = 0; i < channels; i++) {
160                 dev = alloc_sja1000dev(sizeof(struct peak_pci_chan));
161                 if (!dev) {
162                         err = -ENOMEM;
163                         goto failure_remove_channels;
164                 }
165
166                 priv = netdev_priv(dev);
167                 chan = priv->priv;
168
169                 chan->cfg_base = cfg_base;
170                 priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;
171
172                 priv->read_reg = peak_pci_read_reg;
173                 priv->write_reg = peak_pci_write_reg;
174                 priv->post_irq = peak_pci_post_irq;
175
176                 priv->can.clock.freq = PEAK_PCI_CAN_CLOCK;
177                 priv->ocr = PEAK_PCI_OCR;
178                 priv->cdr = PEAK_PCI_CDR;
179                 /* Neither a slave nor a single device distributes the clock */
180                 if (channels == 1 || i > 0)
181                         priv->cdr |= CDR_CLK_OFF;
182
183                 /* Setup interrupt handling */
184                 priv->irq_flags = IRQF_SHARED;
185                 dev->irq = pdev->irq;
186
187                 chan->icr_mask = peak_pci_icr_masks[i];
188                 icr |= chan->icr_mask;
189
190                 SET_NETDEV_DEV(dev, &pdev->dev);
191
192                 err = register_sja1000dev(dev);
193                 if (err) {
194                         dev_err(&pdev->dev, "failed to register device\n");
195                         free_sja1000dev(dev);
196                         goto failure_remove_channels;
197                 }
198
199                 /* Create chain of SJA1000 devices */
200                 if (i == 0)
201                         dev0 = dev;
202                 else
203                         chan->next_dev = dev;
204
205                 dev_info(&pdev->dev,
206                          "%s at reg_base=0x%p cfg_base=0x%p irq=%d\n",
207                          dev->name, priv->reg_base, chan->cfg_base, dev->irq);
208         }
209
210         pci_set_drvdata(pdev, dev0);
211
212         /* Enable interrupts */
213         writew(icr, cfg_base + PITA_ICR + 2);
214
215         return 0;
216
217 failure_remove_channels:
218         /* Disable interrupts */
219         writew(0x0, cfg_base + PITA_ICR + 2);
220
221         for (dev = dev0; dev; dev = chan->next_dev) {
222                 unregister_sja1000dev(dev);
223                 free_sja1000dev(dev);
224                 priv = netdev_priv(dev);
225                 chan = priv->priv;
226                 dev = chan->next_dev;
227         }
228
229         pci_iounmap(pdev, reg_base);
230
231 failure_unmap_cfg_base:
232         pci_iounmap(pdev, cfg_base);
233
234 failure_release_regions:
235         pci_release_regions(pdev);
236
237 failure_disable_pci:
238         pci_disable_device(pdev);
239
240         return err;
241 }
242
243 static void __devexit peak_pci_remove(struct pci_dev *pdev)
244 {
245         struct net_device *dev = pci_get_drvdata(pdev); /* First device */
246         struct sja1000_priv *priv = netdev_priv(dev);
247         struct peak_pci_chan *chan = priv->priv;
248         void __iomem *cfg_base = chan->cfg_base;
249         void __iomem *reg_base = priv->reg_base;
250
251         /* Disable interrupts */
252         writew(0x0, cfg_base + PITA_ICR + 2);
253
254         /* Loop over all registered devices */
255         while (1) {
256                 dev_info(&pdev->dev, "removing device %s\n", dev->name);
257                 unregister_sja1000dev(dev);
258                 free_sja1000dev(dev);
259                 dev = chan->next_dev;
260                 if (!dev)
261                         break;
262                 priv = netdev_priv(dev);
263                 chan = priv->priv;
264         }
265
266         pci_iounmap(pdev, reg_base);
267         pci_iounmap(pdev, cfg_base);
268         pci_release_regions(pdev);
269         pci_disable_device(pdev);
270
271         pci_set_drvdata(pdev, NULL);
272 }
273
274 static struct pci_driver peak_pci_driver = {
275         .name = DRV_NAME,
276         .id_table = peak_pci_tbl,
277         .probe = peak_pci_probe,
278         .remove = __devexit_p(peak_pci_remove),
279 };
280
281 static int __init peak_pci_init(void)
282 {
283         return pci_register_driver(&peak_pci_driver);
284 }
285 module_init(peak_pci_init);
286
287 static void __exit peak_pci_exit(void)
288 {
289         pci_unregister_driver(&peak_pci_driver);
290 }
291 module_exit(peak_pci_exit);