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Linux/drivers/mfd/lpc_sch.c

  1 /*
  2  *  lpc_sch.c - LPC interface for Intel Poulsbo SCH
  3  *
  4  *  LPC bridge function of the Intel SCH contains many other
  5  *  functional units, such as Interrupt controllers, Timers,
  6  *  Power Management, System Management, GPIO, RTC, and LPC
  7  *  Configuration Registers.
  8  *
  9  *  Copyright (c) 2010 CompuLab Ltd
 10  *  Author: Denis Turischev <denis@compulab.co.il>
 11  *
 12  *  This program is free software; you can redistribute it and/or modify
 13  *  it under the terms of the GNU General Public License 2 as published
 14  *  by the Free Software Foundation.
 15  *
 16  *  This program is distributed in the hope that it will be useful,
 17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 19  *  GNU General Public License for more details.
 20  *
 21  *  You should have received a copy of the GNU General Public License
 22  *  along with this program; see the file COPYING.  If not, write to
 23  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 24  */
 25 
 26 #include <linux/kernel.h>
 27 #include <linux/module.h>
 28 #include <linux/errno.h>
 29 #include <linux/acpi.h>
 30 #include <linux/pci.h>
 31 #include <linux/mfd/core.h>
 32 
 33 #define SMBASE          0x40
 34 #define SMBUS_IO_SIZE   64
 35 
 36 #define GPIOBASE        0x44
 37 #define GPIO_IO_SIZE    64
 38 #define GPIO_IO_SIZE_CENTERTON  128
 39 
 40 #define WDTBASE         0x84
 41 #define WDT_IO_SIZE     64
 42 
 43 static struct resource smbus_sch_resource = {
 44                 .flags = IORESOURCE_IO,
 45 };
 46 
 47 static struct resource gpio_sch_resource = {
 48                 .flags = IORESOURCE_IO,
 49 };
 50 
 51 static struct resource wdt_sch_resource = {
 52                 .flags = IORESOURCE_IO,
 53 };
 54 
 55 static struct mfd_cell lpc_sch_cells[3];
 56 
 57 static struct mfd_cell isch_smbus_cell = {
 58         .name = "isch_smbus",
 59         .num_resources = 1,
 60         .resources = &smbus_sch_resource,
 61         .ignore_resource_conflicts = true,
 62 };
 63 
 64 static struct mfd_cell sch_gpio_cell = {
 65         .name = "sch_gpio",
 66         .num_resources = 1,
 67         .resources = &gpio_sch_resource,
 68         .ignore_resource_conflicts = true,
 69 };
 70 
 71 static struct mfd_cell wdt_sch_cell = {
 72         .name = "ie6xx_wdt",
 73         .num_resources = 1,
 74         .resources = &wdt_sch_resource,
 75         .ignore_resource_conflicts = true,
 76 };
 77 
 78 static const struct pci_device_id lpc_sch_ids[] = {
 79         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
 80         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
 81         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB) },
 82         { 0, }
 83 };
 84 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
 85 
 86 static int lpc_sch_probe(struct pci_dev *dev,
 87                                 const struct pci_device_id *id)
 88 {
 89         unsigned int base_addr_cfg;
 90         unsigned short base_addr;
 91         int i, cells = 0;
 92         int ret;
 93 
 94         pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
 95         base_addr = 0;
 96         if (!(base_addr_cfg & (1 << 31)))
 97                 dev_warn(&dev->dev, "Decode of the SMBus I/O range disabled\n");
 98         else
 99                 base_addr = (unsigned short)base_addr_cfg;
100 
101         if (base_addr == 0) {
102                 dev_warn(&dev->dev, "I/O space for SMBus uninitialized\n");
103         } else {
104                 lpc_sch_cells[cells++] = isch_smbus_cell;
105                 smbus_sch_resource.start = base_addr;
106                 smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
107         }
108 
109         pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
110         base_addr = 0;
111         if (!(base_addr_cfg & (1 << 31)))
112                 dev_warn(&dev->dev, "Decode of the GPIO I/O range disabled\n");
113         else
114                 base_addr = (unsigned short)base_addr_cfg;
115 
116         if (base_addr == 0) {
117                 dev_warn(&dev->dev, "I/O space for GPIO uninitialized\n");
118         } else {
119                 lpc_sch_cells[cells++] = sch_gpio_cell;
120                 gpio_sch_resource.start = base_addr;
121                 if (id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB)
122                         gpio_sch_resource.end = base_addr + GPIO_IO_SIZE_CENTERTON - 1;
123                 else
124                         gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
125         }
126 
127         if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC
128             || id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB) {
129                 pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
130                 base_addr = 0;
131                 if (!(base_addr_cfg & (1 << 31)))
132                         dev_warn(&dev->dev, "Decode of the WDT I/O range disabled\n");
133                 else
134                         base_addr = (unsigned short)base_addr_cfg;
135                 if (base_addr == 0)
136                         dev_warn(&dev->dev, "I/O space for WDT uninitialized\n");
137                 else {
138                         lpc_sch_cells[cells++] = wdt_sch_cell;
139                         wdt_sch_resource.start = base_addr;
140                         wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
141                 }
142         }
143 
144         if (WARN_ON(cells > ARRAY_SIZE(lpc_sch_cells))) {
145                 dev_err(&dev->dev, "Cell count exceeds array size");
146                 return -ENODEV;
147         }
148 
149         if (cells == 0) {
150                 dev_err(&dev->dev, "All decode registers disabled.\n");
151                 return -ENODEV;
152         }
153 
154         for (i = 0; i < cells; i++)
155                 lpc_sch_cells[i].id = id->device;
156 
157         ret = mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
158         if (ret)
159                 mfd_remove_devices(&dev->dev);
160 
161         return ret;
162 }
163 
164 static void lpc_sch_remove(struct pci_dev *dev)
165 {
166         mfd_remove_devices(&dev->dev);
167 }
168 
169 static struct pci_driver lpc_sch_driver = {
170         .name           = "lpc_sch",
171         .id_table       = lpc_sch_ids,
172         .probe          = lpc_sch_probe,
173         .remove         = lpc_sch_remove,
174 };
175 
176 module_pci_driver(lpc_sch_driver);
177 
178 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
179 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
180 MODULE_LICENSE("GPL");
181 

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