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Linux/drivers/mfd/vx855.c

  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 const 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 const struct pci_device_id 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 

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