1/* 2 * matrox_w1.c 3 * 4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> 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 <asm/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#include <linux/timer.h> 37 38#include "../w1.h" 39#include "../w1_int.h" 40#include "../w1_log.h" 41 42MODULE_LICENSE("GPL"); 43MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); 44MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio)."); 45 46static struct pci_device_id matrox_w1_tbl[] = { 47 { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) }, 48 { }, 49}; 50MODULE_DEVICE_TABLE(pci, matrox_w1_tbl); 51 52static int __devinit matrox_w1_probe(struct pci_dev *, const struct pci_device_id *); 53static void __devexit matrox_w1_remove(struct pci_dev *); 54 55static struct pci_driver matrox_w1_pci_driver = { 56 .name = "matrox_w1", 57 .id_table = matrox_w1_tbl, 58 .probe = matrox_w1_probe, 59 .remove = __devexit_p(matrox_w1_remove), 60}; 61 62/* 63 * Matrox G400 DDC registers. 64 */ 65 66#define MATROX_G400_DDC_CLK (1<<4) 67#define MATROX_G400_DDC_DATA (1<<1) 68 69#define MATROX_BASE 0x3C00 70#define MATROX_STATUS 0x1e14 71 72#define MATROX_PORT_INDEX_OFFSET 0x00 73#define MATROX_PORT_DATA_OFFSET 0x0A 74 75#define MATROX_GET_CONTROL 0x2A 76#define MATROX_GET_DATA 0x2B 77#define MATROX_CURSOR_CTL 0x06 78 79struct matrox_device 80{ 81 void __iomem *base_addr; 82 void __iomem *port_index; 83 void __iomem *port_data; 84 u8 data_mask; 85 86 unsigned long phys_addr; 87 void __iomem *virt_addr; 88 unsigned long found; 89 90 struct w1_bus_master *bus_master; 91}; 92 93static u8 matrox_w1_read_ddc_bit(void *); 94static void matrox_w1_write_ddc_bit(void *, u8); 95 96/* 97 * These functions read and write DDC Data bit. 98 * 99 * Using tristate pins, since i can't find any open-drain pin in whole motherboard. 100 * Unfortunately we can't connect to Intel's 82801xx IO controller 101 * since we don't know motherboard schema, which has pretty unused(may be not) GPIO. 102 * 103 * I've heard that PIIX also has open drain pin. 104 * 105 * Port mapping. 106 */ 107static __inline__ u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg) 108{ 109 u8 ret; 110 111 writeb(reg, dev->port_index); 112 ret = readb(dev->port_data); 113 barrier(); 114 115 return ret; 116} 117 118static __inline__ void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val) 119{ 120 writeb(reg, dev->port_index); 121 writeb(val, dev->port_data); 122 wmb(); 123} 124 125static void matrox_w1_write_ddc_bit(void *data, u8 bit) 126{ 127 u8 ret; 128 struct matrox_device *dev = data; 129 130 if (bit) 131 bit = 0; 132 else 133 bit = dev->data_mask; 134 135 ret = matrox_w1_read_reg(dev, MATROX_GET_CONTROL); 136 matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit)); 137 matrox_w1_write_reg(dev, MATROX_GET_DATA, 0x00); 138} 139 140static u8 matrox_w1_read_ddc_bit(void *data) 141{ 142 u8 ret; 143 struct matrox_device *dev = data; 144 145 ret = matrox_w1_read_reg(dev, MATROX_GET_DATA); 146 147 return ret; 148} 149 150static void matrox_w1_hw_init(struct matrox_device *dev) 151{ 152 matrox_w1_write_reg(dev, MATROX_GET_DATA, 0xFF); 153 matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00); 154} 155 156static int __devinit matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 157{ 158 struct matrox_device *dev; 159 int err; 160 161 assert(pdev != NULL); 162 assert(ent != NULL); 163 164 if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400) 165 return -ENODEV; 166 167 dev = kmalloc(sizeof(struct matrox_device) + 168 sizeof(struct w1_bus_master), GFP_KERNEL); 169 if (!dev) { 170 dev_err(&pdev->dev, 171 "%s: Failed to create new matrox_device object.\n", 172 __func__); 173 return -ENOMEM; 174 } 175 176 memset(dev, 0, sizeof(struct matrox_device) + sizeof(struct w1_bus_master)); 177 178 dev->bus_master = (struct w1_bus_master *)(dev + 1); 179 180 /* 181 * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c 182 */ 183 184 dev->phys_addr = pci_resource_start(pdev, 1); 185 186 dev->virt_addr = ioremap_nocache(dev->phys_addr, 16384); 187 if (!dev->virt_addr) { 188 dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n", 189 __func__, dev->phys_addr, 16384); 190 err = -EIO; 191 goto err_out_free_device; 192 } 193 194 dev->base_addr = dev->virt_addr + MATROX_BASE; 195 dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET; 196 dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET; 197 dev->data_mask = (MATROX_G400_DDC_DATA); 198 199 matrox_w1_hw_init(dev); 200 201 dev->bus_master->data = dev; 202 dev->bus_master->read_bit = &matrox_w1_read_ddc_bit; 203 dev->bus_master->write_bit = &matrox_w1_write_ddc_bit; 204 205 err = w1_add_master_device(dev->bus_master); 206 if (err) 207 goto err_out_free_device; 208 209 pci_set_drvdata(pdev, dev); 210 211 dev->found = 1; 212 213 dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n"); 214 215 return 0; 216 217err_out_free_device: 218 if (dev->virt_addr) 219 iounmap(dev->virt_addr); 220 kfree(dev); 221 222 return err; 223} 224 225static void __devexit matrox_w1_remove(struct pci_dev *pdev) 226{ 227 struct matrox_device *dev = pci_get_drvdata(pdev); 228 229 assert(dev != NULL); 230 231 if (dev->found) { 232 w1_remove_master_device(dev->bus_master); 233 iounmap(dev->virt_addr); 234 } 235 kfree(dev); 236} 237 238static int __init matrox_w1_init(void) 239{ 240 return pci_register_driver(&matrox_w1_pci_driver); 241} 242 243static void __exit matrox_w1_fini(void) 244{ 245 pci_unregister_driver(&matrox_w1_pci_driver); 246} 247 248module_init(matrox_w1_init); 249module_exit(matrox_w1_fini); 250