1 /* 2 * Linux multi-function-device driver (MFD) for the integrated peripherals 3 * of the VIA VX855 chipset 4 * 5 * Copyright (C) 2009 VIA Technologies, Inc. 6 * Copyright (C) 2010 One Laptop per Child 7 * Author: Harald Welte <HaraldWelte@viatech.com> 8 * All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation; either version 2 of 13 * the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 23 * MA 02111-1307 USA 24 * 25 */ 26 27 #include <linux/kernel.h> 28 #include <linux/module.h> 29 #include <linux/device.h> 30 #include <linux/platform_device.h> 31 #include <linux/pci.h> 32 #include <linux/mfd/core.h> 33 34 /* offset into pci config space indicating the 16bit register containing 35 * the power management IO space base */ 36 #define VX855_CFG_PMIO_OFFSET 0x88 37 38 /* ACPI I/O Space registers */ 39 #define VX855_PMIO_ACPI 0x00 40 #define VX855_PMIO_ACPI_LEN 0x0b 41 42 /* Processor Power Management */ 43 #define VX855_PMIO_PPM 0x10 44 #define VX855_PMIO_PPM_LEN 0x08 45 46 /* General Purpose Power Management */ 47 #define VX855_PMIO_GPPM 0x20 48 #define VX855_PMIO_R_GPI 0x48 49 #define VX855_PMIO_R_GPO 0x4c 50 #define VX855_PMIO_GPPM_LEN 0x33 51 52 #define VSPIC_MMIO_SIZE 0x1000 53 54 static struct resource vx855_gpio_resources[] = { 55 { 56 .flags = IORESOURCE_IO, 57 }, 58 { 59 .flags = IORESOURCE_IO, 60 }, 61 }; 62 63 static struct mfd_cell vx855_cells[] = { 64 { 65 .name = "vx855_gpio", 66 .num_resources = ARRAY_SIZE(vx855_gpio_resources), 67 .resources = vx855_gpio_resources, 68 69 /* we must ignore resource conflicts, for reasons outlined in 70 * the vx855_gpio driver */ 71 .ignore_resource_conflicts = true, 72 }, 73 }; 74 75 static int vx855_probe(struct pci_dev *pdev, 76 const struct pci_device_id *id) 77 { 78 int ret; 79 u16 gpio_io_offset; 80 81 ret = pci_enable_device(pdev); 82 if (ret) 83 return -ENODEV; 84 85 pci_read_config_word(pdev, VX855_CFG_PMIO_OFFSET, &gpio_io_offset); 86 if (!gpio_io_offset) { 87 dev_warn(&pdev->dev, 88 "BIOS did not assign PMIO base offset?!?\n"); 89 ret = -ENODEV; 90 goto out; 91 } 92 93 /* mask out the lowest seven bits, as they are always zero, but 94 * hardware returns them as 0x01 */ 95 gpio_io_offset &= 0xff80; 96 97 /* As the region identified here includes many non-GPIO things, we 98 * only work with the specific registers that concern us. */ 99 vx855_gpio_resources[0].start = gpio_io_offset + VX855_PMIO_R_GPI; 100 vx855_gpio_resources[0].end = vx855_gpio_resources[0].start + 3; 101 vx855_gpio_resources[1].start = gpio_io_offset + VX855_PMIO_R_GPO; 102 vx855_gpio_resources[1].end = vx855_gpio_resources[1].start + 3; 103 104 ret = mfd_add_devices(&pdev->dev, -1, vx855_cells, ARRAY_SIZE(vx855_cells), 105 NULL, 0, NULL); 106 107 /* we always return -ENODEV here in order to enable other 108 * drivers like old, not-yet-platform_device ported i2c-viapro */ 109 return -ENODEV; 110 out: 111 pci_disable_device(pdev); 112 return ret; 113 } 114 115 static void vx855_remove(struct pci_dev *pdev) 116 { 117 mfd_remove_devices(&pdev->dev); 118 pci_disable_device(pdev); 119 } 120 121 static DEFINE_PCI_DEVICE_TABLE(vx855_pci_tbl) = { 122 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) }, 123 { 0, } 124 }; 125 MODULE_DEVICE_TABLE(pci, vx855_pci_tbl); 126 127 static struct pci_driver vx855_pci_driver = { 128 .name = "vx855", 129 .id_table = vx855_pci_tbl, 130 .probe = vx855_probe, 131 .remove = vx855_remove, 132 }; 133 134 module_pci_driver(vx855_pci_driver); 135 136 MODULE_LICENSE("GPL"); 137 MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); 138 MODULE_DESCRIPTION("Driver for the VIA VX855 chipset"); 139