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Linux/drivers/w1/masters/matrox_w1.c

  1 /*
  2  *      matrox_w1.c
  3  *
  4  * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
  5  *
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 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
 19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 20  */
 21 
 22 #include <asm/types.h>
 23 #include <linux/atomic.h>
 24 #include <asm/io.h>
 25 
 26 #include <linux/delay.h>
 27 #include <linux/kernel.h>
 28 #include <linux/module.h>
 29 #include <linux/list.h>
 30 #include <linux/interrupt.h>
 31 #include <linux/spinlock.h>
 32 #include <linux/timer.h>
 33 #include <linux/slab.h>
 34 #include <linux/pci_ids.h>
 35 #include <linux/pci.h>
 36 
 37 #include "../w1.h"
 38 #include "../w1_int.h"
 39 #include "../w1_log.h"
 40 
 41 MODULE_LICENSE("GPL");
 42 MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
 43 MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio).");
 44 
 45 static struct pci_device_id matrox_w1_tbl[] = {
 46         { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) },
 47         { },
 48 };
 49 MODULE_DEVICE_TABLE(pci, matrox_w1_tbl);
 50 
 51 static int matrox_w1_probe(struct pci_dev *, const struct pci_device_id *);
 52 static void matrox_w1_remove(struct pci_dev *);
 53 
 54 static struct pci_driver matrox_w1_pci_driver = {
 55         .name = "matrox_w1",
 56         .id_table = matrox_w1_tbl,
 57         .probe = matrox_w1_probe,
 58         .remove = matrox_w1_remove,
 59 };
 60 
 61 /*
 62  * Matrox G400 DDC registers.
 63  */
 64 
 65 #define MATROX_G400_DDC_CLK             (1<<4)
 66 #define MATROX_G400_DDC_DATA            (1<<1)
 67 
 68 #define MATROX_BASE                     0x3C00
 69 #define MATROX_STATUS                   0x1e14
 70 
 71 #define MATROX_PORT_INDEX_OFFSET        0x00
 72 #define MATROX_PORT_DATA_OFFSET         0x0A
 73 
 74 #define MATROX_GET_CONTROL              0x2A
 75 #define MATROX_GET_DATA                 0x2B
 76 #define MATROX_CURSOR_CTL               0x06
 77 
 78 struct matrox_device
 79 {
 80         void __iomem *base_addr;
 81         void __iomem *port_index;
 82         void __iomem *port_data;
 83         u8 data_mask;
 84 
 85         unsigned long phys_addr;
 86         void __iomem *virt_addr;
 87         unsigned long found;
 88 
 89         struct w1_bus_master *bus_master;
 90 };
 91 
 92 static u8 matrox_w1_read_ddc_bit(void *);
 93 static void matrox_w1_write_ddc_bit(void *, u8);
 94 
 95 /*
 96  * These functions read and write DDC Data bit.
 97  *
 98  * Using tristate pins, since i can't find any open-drain pin in whole motherboard.
 99  * Unfortunately we can't connect to Intel's 82801xx IO controller
100  * since we don't know motherboard schema, which has pretty unused(may be not) GPIO.
101  *
102  * I've heard that PIIX also has open drain pin.
103  *
104  * Port mapping.
105  */
106 static __inline__ u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg)
107 {
108         u8 ret;
109 
110         writeb(reg, dev->port_index);
111         ret = readb(dev->port_data);
112         barrier();
113 
114         return ret;
115 }
116 
117 static __inline__ void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val)
118 {
119         writeb(reg, dev->port_index);
120         writeb(val, dev->port_data);
121         wmb();
122 }
123 
124 static void matrox_w1_write_ddc_bit(void *data, u8 bit)
125 {
126         u8 ret;
127         struct matrox_device *dev = data;
128 
129         if (bit)
130                 bit = 0;
131         else
132                 bit = dev->data_mask;
133 
134         ret = matrox_w1_read_reg(dev, MATROX_GET_CONTROL);
135         matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit));
136         matrox_w1_write_reg(dev, MATROX_GET_DATA, 0x00);
137 }
138 
139 static u8 matrox_w1_read_ddc_bit(void *data)
140 {
141         u8 ret;
142         struct matrox_device *dev = data;
143 
144         ret = matrox_w1_read_reg(dev, MATROX_GET_DATA);
145 
146         return ret;
147 }
148 
149 static void matrox_w1_hw_init(struct matrox_device *dev)
150 {
151         matrox_w1_write_reg(dev, MATROX_GET_DATA, 0xFF);
152         matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00);
153 }
154 
155 static int matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
156 {
157         struct matrox_device *dev;
158         int err;
159 
160         assert(pdev != NULL);
161         assert(ent != NULL);
162 
163         if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400)
164                 return -ENODEV;
165 
166         dev = kzalloc(sizeof(struct matrox_device) +
167                        sizeof(struct w1_bus_master), GFP_KERNEL);
168         if (!dev) {
169                 dev_err(&pdev->dev,
170                         "%s: Failed to create new matrox_device object.\n",
171                         __func__);
172                 return -ENOMEM;
173         }
174 
175 
176         dev->bus_master = (struct w1_bus_master *)(dev + 1);
177 
178         /*
179          * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c
180          */
181 
182         dev->phys_addr = pci_resource_start(pdev, 1);
183 
184         dev->virt_addr = ioremap_nocache(dev->phys_addr, 16384);
185         if (!dev->virt_addr) {
186                 dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n",
187                         __func__, dev->phys_addr, 16384);
188                 err = -EIO;
189                 goto err_out_free_device;
190         }
191 
192         dev->base_addr = dev->virt_addr + MATROX_BASE;
193         dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET;
194         dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET;
195         dev->data_mask = (MATROX_G400_DDC_DATA);
196 
197         matrox_w1_hw_init(dev);
198 
199         dev->bus_master->data = dev;
200         dev->bus_master->read_bit = &matrox_w1_read_ddc_bit;
201         dev->bus_master->write_bit = &matrox_w1_write_ddc_bit;
202 
203         err = w1_add_master_device(dev->bus_master);
204         if (err)
205                 goto err_out_free_device;
206 
207         pci_set_drvdata(pdev, dev);
208 
209         dev->found = 1;
210 
211         dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n");
212 
213         return 0;
214 
215 err_out_free_device:
216         if (dev->virt_addr)
217                 iounmap(dev->virt_addr);
218         kfree(dev);
219 
220         return err;
221 }
222 
223 static void matrox_w1_remove(struct pci_dev *pdev)
224 {
225         struct matrox_device *dev = pci_get_drvdata(pdev);
226 
227         assert(dev != NULL);
228 
229         if (dev->found) {
230                 w1_remove_master_device(dev->bus_master);
231                 iounmap(dev->virt_addr);
232         }
233         kfree(dev);
234 }
235 
236 static int __init matrox_w1_init(void)
237 {
238         return pci_register_driver(&matrox_w1_pci_driver);
239 }
240 
241 static void __exit matrox_w1_fini(void)
242 {
243         pci_unregister_driver(&matrox_w1_pci_driver);
244 }
245 
246 module_init(matrox_w1_init);
247 module_exit(matrox_w1_fini);
248 

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