Daniel Drake | 375fc77 | 2010-09-30 21:55:41 +0100 | [diff] [blame] | 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 | |
Geert Uytterhoeven | 5ac9855 | 2013-11-18 14:33:06 +0100 | [diff] [blame] | 63 | static const struct mfd_cell vx855_cells[] = { |
Daniel Drake | 375fc77 | 2010-09-30 21:55:41 +0100 | [diff] [blame] | 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 | |
Bill Pemberton | f791be4 | 2012-11-19 13:23:04 -0500 | [diff] [blame] | 75 | static int vx855_probe(struct pci_dev *pdev, |
Daniel Drake | 375fc77 | 2010-09-30 21:55:41 +0100 | [diff] [blame] | 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), |
Mark Brown | 0848c94 | 2012-09-11 15:16:36 +0800 | [diff] [blame] | 105 | NULL, 0, NULL); |
Daniel Drake | 375fc77 | 2010-09-30 21:55:41 +0100 | [diff] [blame] | 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 | |
Bill Pemberton | 4740f73 | 2012-11-19 13:26:01 -0500 | [diff] [blame] | 115 | static void vx855_remove(struct pci_dev *pdev) |
Daniel Drake | 375fc77 | 2010-09-30 21:55:41 +0100 | [diff] [blame] | 116 | { |
| 117 | mfd_remove_devices(&pdev->dev); |
| 118 | pci_disable_device(pdev); |
| 119 | } |
| 120 | |
Axel Lin | 61485c6 | 2011-12-01 09:41:03 +0800 | [diff] [blame] | 121 | static DEFINE_PCI_DEVICE_TABLE(vx855_pci_tbl) = { |
Daniel Drake | 375fc77 | 2010-09-30 21:55:41 +0100 | [diff] [blame] | 122 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) }, |
| 123 | { 0, } |
| 124 | }; |
Axel Lin | bcd2f63 | 2011-02-28 14:34:27 +0800 | [diff] [blame] | 125 | MODULE_DEVICE_TABLE(pci, vx855_pci_tbl); |
Daniel Drake | 375fc77 | 2010-09-30 21:55:41 +0100 | [diff] [blame] | 126 | |
| 127 | static struct pci_driver vx855_pci_driver = { |
| 128 | .name = "vx855", |
| 129 | .id_table = vx855_pci_tbl, |
| 130 | .probe = vx855_probe, |
Bill Pemberton | 8444921 | 2012-11-19 13:20:24 -0500 | [diff] [blame] | 131 | .remove = vx855_remove, |
Daniel Drake | 375fc77 | 2010-09-30 21:55:41 +0100 | [diff] [blame] | 132 | }; |
| 133 | |
Axel Lin | 38a36f5 | 2012-04-03 09:09:19 +0800 | [diff] [blame] | 134 | module_pci_driver(vx855_pci_driver); |
Daniel Drake | 375fc77 | 2010-09-30 21:55:41 +0100 | [diff] [blame] | 135 | |
| 136 | MODULE_LICENSE("GPL"); |
| 137 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); |
| 138 | MODULE_DESCRIPTION("Driver for the VIA VX855 chipset"); |