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