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 42 MODULE_LICENSE("GPL"); 43 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); 44 MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio)."); 45 46 static struct pci_device_id matrox_w1_tbl[] = { 47 { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) }, 48 { }, 49 }; 50 MODULE_DEVICE_TABLE(pci, matrox_w1_tbl); 51 52 static int __devinit matrox_w1_probe(struct pci_dev *, const struct pci_device_id *); 53 static void __devexit matrox_w1_remove(struct pci_dev *); 54 55 static 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 79 struct 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 93 static u8 matrox_w1_read_ddc_bit(void *); 94 static 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 */ 107 static __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 } 117 118 static __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 } 124 125 static 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 } 139 140 static 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 } 149 150 static 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 } 155 156 static 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; 216 217 err_out_free_device: 218 kfree(dev); 219 220 return err; 221 } 222 223 static void __devexit 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