| /* |
| * matrox_w1.c |
| * |
| * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <asm/types.h> |
| #include <linux/atomic.h> |
| #include <asm/io.h> |
| |
| #include <linux/delay.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/list.h> |
| #include <linux/interrupt.h> |
| #include <linux/spinlock.h> |
| #include <linux/timer.h> |
| #include <linux/slab.h> |
| #include <linux/pci_ids.h> |
| #include <linux/pci.h> |
| |
| #include "../w1.h" |
| #include "../w1_int.h" |
| #include "../w1_log.h" |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); |
| MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio)."); |
| |
| static struct pci_device_id matrox_w1_tbl[] = { |
| { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(pci, matrox_w1_tbl); |
| |
| static int matrox_w1_probe(struct pci_dev *, const struct pci_device_id *); |
| static void matrox_w1_remove(struct pci_dev *); |
| |
| static struct pci_driver matrox_w1_pci_driver = { |
| .name = "matrox_w1", |
| .id_table = matrox_w1_tbl, |
| .probe = matrox_w1_probe, |
| .remove = matrox_w1_remove, |
| }; |
| |
| /* |
| * Matrox G400 DDC registers. |
| */ |
| |
| #define MATROX_G400_DDC_CLK (1<<4) |
| #define MATROX_G400_DDC_DATA (1<<1) |
| |
| #define MATROX_BASE 0x3C00 |
| #define MATROX_STATUS 0x1e14 |
| |
| #define MATROX_PORT_INDEX_OFFSET 0x00 |
| #define MATROX_PORT_DATA_OFFSET 0x0A |
| |
| #define MATROX_GET_CONTROL 0x2A |
| #define MATROX_GET_DATA 0x2B |
| #define MATROX_CURSOR_CTL 0x06 |
| |
| struct matrox_device |
| { |
| void __iomem *base_addr; |
| void __iomem *port_index; |
| void __iomem *port_data; |
| u8 data_mask; |
| |
| unsigned long phys_addr; |
| void __iomem *virt_addr; |
| unsigned long found; |
| |
| struct w1_bus_master *bus_master; |
| }; |
| |
| static u8 matrox_w1_read_ddc_bit(void *); |
| static void matrox_w1_write_ddc_bit(void *, u8); |
| |
| /* |
| * These functions read and write DDC Data bit. |
| * |
| * Using tristate pins, since i can't find any open-drain pin in whole motherboard. |
| * Unfortunately we can't connect to Intel's 82801xx IO controller |
| * since we don't know motherboard schema, which has pretty unused(may be not) GPIO. |
| * |
| * I've heard that PIIX also has open drain pin. |
| * |
| * Port mapping. |
| */ |
| static __inline__ u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg) |
| { |
| u8 ret; |
| |
| writeb(reg, dev->port_index); |
| ret = readb(dev->port_data); |
| barrier(); |
| |
| return ret; |
| } |
| |
| static __inline__ void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val) |
| { |
| writeb(reg, dev->port_index); |
| writeb(val, dev->port_data); |
| wmb(); |
| } |
| |
| static void matrox_w1_write_ddc_bit(void *data, u8 bit) |
| { |
| u8 ret; |
| struct matrox_device *dev = data; |
| |
| if (bit) |
| bit = 0; |
| else |
| bit = dev->data_mask; |
| |
| ret = matrox_w1_read_reg(dev, MATROX_GET_CONTROL); |
| matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit)); |
| matrox_w1_write_reg(dev, MATROX_GET_DATA, 0x00); |
| } |
| |
| static u8 matrox_w1_read_ddc_bit(void *data) |
| { |
| u8 ret; |
| struct matrox_device *dev = data; |
| |
| ret = matrox_w1_read_reg(dev, MATROX_GET_DATA); |
| |
| return ret; |
| } |
| |
| static void matrox_w1_hw_init(struct matrox_device *dev) |
| { |
| matrox_w1_write_reg(dev, MATROX_GET_DATA, 0xFF); |
| matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00); |
| } |
| |
| static int matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent) |
| { |
| struct matrox_device *dev; |
| int err; |
| |
| assert(pdev != NULL); |
| assert(ent != NULL); |
| |
| if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400) |
| return -ENODEV; |
| |
| dev = kzalloc(sizeof(struct matrox_device) + |
| sizeof(struct w1_bus_master), GFP_KERNEL); |
| if (!dev) { |
| dev_err(&pdev->dev, |
| "%s: Failed to create new matrox_device object.\n", |
| __func__); |
| return -ENOMEM; |
| } |
| |
| |
| dev->bus_master = (struct w1_bus_master *)(dev + 1); |
| |
| /* |
| * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c |
| */ |
| |
| dev->phys_addr = pci_resource_start(pdev, 1); |
| |
| dev->virt_addr = ioremap_nocache(dev->phys_addr, 16384); |
| if (!dev->virt_addr) { |
| dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n", |
| __func__, dev->phys_addr, 16384); |
| err = -EIO; |
| goto err_out_free_device; |
| } |
| |
| dev->base_addr = dev->virt_addr + MATROX_BASE; |
| dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET; |
| dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET; |
| dev->data_mask = (MATROX_G400_DDC_DATA); |
| |
| matrox_w1_hw_init(dev); |
| |
| dev->bus_master->data = dev; |
| dev->bus_master->read_bit = &matrox_w1_read_ddc_bit; |
| dev->bus_master->write_bit = &matrox_w1_write_ddc_bit; |
| |
| err = w1_add_master_device(dev->bus_master); |
| if (err) |
| goto err_out_free_device; |
| |
| pci_set_drvdata(pdev, dev); |
| |
| dev->found = 1; |
| |
| dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n"); |
| |
| return 0; |
| |
| err_out_free_device: |
| if (dev->virt_addr) |
| iounmap(dev->virt_addr); |
| kfree(dev); |
| |
| return err; |
| } |
| |
| static void matrox_w1_remove(struct pci_dev *pdev) |
| { |
| struct matrox_device *dev = pci_get_drvdata(pdev); |
| |
| assert(dev != NULL); |
| |
| if (dev->found) { |
| w1_remove_master_device(dev->bus_master); |
| iounmap(dev->virt_addr); |
| } |
| kfree(dev); |
| } |
| module_pci_driver(matrox_w1_pci_driver); |