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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  *  Copyright (c) 2014 Intel Corp.
 11  *  Author: Denis Turischev <denis@compulab.co.il>
 12  *
 13  *  This program is free software; you can redistribute it and/or modify
 14  *  it under the terms of the GNU General Public License 2 as published
 15  *  by the Free Software Foundation.
 16  *
 17  *  This program is distributed in the hope that it will be useful,
 18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 20  *  GNU General Public License for more details.
 21  */
 22 
 23 #include <linux/kernel.h>
 24 #include <linux/module.h>
 25 #include <linux/errno.h>
 26 #include <linux/acpi.h>
 27 #include <linux/pci.h>
 28 #include <linux/mfd/core.h>
 29 
 30 #define SMBASE          0x40
 31 #define SMBUS_IO_SIZE   64
 32 
 33 #define GPIOBASE        0x44
 34 #define GPIO_IO_SIZE    64
 35 #define GPIO_IO_SIZE_CENTERTON  128
 36 
 37 /* Intel Quark X1000 GPIO IRQ Number */
 38 #define GPIO_IRQ_QUARK_X1000    9
 39 
 40 #define WDTBASE         0x84
 41 #define WDT_IO_SIZE     64
 42 
 43 enum sch_chipsets {
 44         LPC_SCH = 0,            /* Intel Poulsbo SCH */
 45         LPC_ITC,                /* Intel Tunnel Creek */
 46         LPC_CENTERTON,          /* Intel Centerton */
 47         LPC_QUARK_X1000,        /* Intel Quark X1000 */
 48 };
 49 
 50 struct lpc_sch_info {
 51         unsigned int io_size_smbus;
 52         unsigned int io_size_gpio;
 53         unsigned int io_size_wdt;
 54         int irq_gpio;
 55 };
 56 
 57 static struct lpc_sch_info sch_chipset_info[] = {
 58         [LPC_SCH] = {
 59                 .io_size_smbus = SMBUS_IO_SIZE,
 60                 .io_size_gpio = GPIO_IO_SIZE,
 61                 .irq_gpio = -1,
 62         },
 63         [LPC_ITC] = {
 64                 .io_size_smbus = SMBUS_IO_SIZE,
 65                 .io_size_gpio = GPIO_IO_SIZE,
 66                 .io_size_wdt = WDT_IO_SIZE,
 67                 .irq_gpio = -1,
 68         },
 69         [LPC_CENTERTON] = {
 70                 .io_size_smbus = SMBUS_IO_SIZE,
 71                 .io_size_gpio = GPIO_IO_SIZE_CENTERTON,
 72                 .io_size_wdt = WDT_IO_SIZE,
 73                 .irq_gpio = -1,
 74         },
 75         [LPC_QUARK_X1000] = {
 76                 .io_size_gpio = GPIO_IO_SIZE,
 77                 .irq_gpio = GPIO_IRQ_QUARK_X1000,
 78                 .io_size_wdt = WDT_IO_SIZE,
 79         },
 80 };
 81 
 82 static const struct pci_device_id lpc_sch_ids[] = {
 83         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC), LPC_SCH },
 84         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC), LPC_ITC },
 85         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB), LPC_CENTERTON },
 86         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB), LPC_QUARK_X1000 },
 87         { 0, }
 88 };
 89 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
 90 
 91 #define LPC_NO_RESOURCE         1
 92 #define LPC_SKIP_RESOURCE       2
 93 
 94 static int lpc_sch_get_io(struct pci_dev *pdev, int where, const char *name,
 95                           struct resource *res, int size)
 96 {
 97         unsigned int base_addr_cfg;
 98         unsigned short base_addr;
 99 
100         if (size == 0)
101                 return LPC_NO_RESOURCE;
102 
103         pci_read_config_dword(pdev, where, &base_addr_cfg);
104         base_addr = 0;
105         if (!(base_addr_cfg & (1 << 31)))
106                 dev_warn(&pdev->dev, "Decode of the %s I/O range disabled\n",
107                          name);
108         else
109                 base_addr = (unsigned short)base_addr_cfg;
110 
111         if (base_addr == 0) {
112                 dev_warn(&pdev->dev, "I/O space for %s uninitialized\n", name);
113                 return LPC_SKIP_RESOURCE;
114         }
115 
116         res->start = base_addr;
117         res->end = base_addr + size - 1;
118         res->flags = IORESOURCE_IO;
119 
120         return 0;
121 }
122 
123 static int lpc_sch_populate_cell(struct pci_dev *pdev, int where,
124                                  const char *name, int size, int irq,
125                                  int id, struct mfd_cell *cell)
126 {
127         struct resource *res;
128         int ret;
129 
130         res = devm_kcalloc(&pdev->dev, 2, sizeof(*res), GFP_KERNEL);
131         if (!res)
132                 return -ENOMEM;
133 
134         ret = lpc_sch_get_io(pdev, where, name, res, size);
135         if (ret)
136                 return ret;
137 
138         memset(cell, 0, sizeof(*cell));
139 
140         cell->name = name;
141         cell->resources = res;
142         cell->num_resources = 1;
143         cell->ignore_resource_conflicts = true;
144         cell->id = id;
145 
146         /* Check if we need to add an IRQ resource */
147         if (irq < 0)
148                 return 0;
149 
150         res++;
151 
152         res->start = irq;
153         res->end = irq;
154         res->flags = IORESOURCE_IRQ;
155 
156         cell->num_resources++;
157 
158         return 0;
159 }
160 
161 static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id)
162 {
163         struct mfd_cell lpc_sch_cells[3];
164         struct lpc_sch_info *info = &sch_chipset_info[id->driver_data];
165         unsigned int cells = 0;
166         int ret;
167 
168         ret = lpc_sch_populate_cell(dev, SMBASE, "isch_smbus",
169                                     info->io_size_smbus, -1,
170                                     id->device, &lpc_sch_cells[cells]);
171         if (ret < 0)
172                 return ret;
173         if (ret == 0)
174                 cells++;
175 
176         ret = lpc_sch_populate_cell(dev, GPIOBASE, "sch_gpio",
177                                     info->io_size_gpio, info->irq_gpio,
178                                     id->device, &lpc_sch_cells[cells]);
179         if (ret < 0)
180                 return ret;
181         if (ret == 0)
182                 cells++;
183 
184         ret = lpc_sch_populate_cell(dev, WDTBASE, "ie6xx_wdt",
185                                     info->io_size_wdt, -1,
186                                     id->device, &lpc_sch_cells[cells]);
187         if (ret < 0)
188                 return ret;
189         if (ret == 0)
190                 cells++;
191 
192         if (cells == 0) {
193                 dev_err(&dev->dev, "All decode registers disabled.\n");
194                 return -ENODEV;
195         }
196 
197         return mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
198 }
199 
200 static void lpc_sch_remove(struct pci_dev *dev)
201 {
202         mfd_remove_devices(&dev->dev);
203 }
204 
205 static struct pci_driver lpc_sch_driver = {
206         .name           = "lpc_sch",
207         .id_table       = lpc_sch_ids,
208         .probe          = lpc_sch_probe,
209         .remove         = lpc_sch_remove,
210 };
211 
212 module_pci_driver(lpc_sch_driver);
213 
214 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
215 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
216 MODULE_LICENSE("GPL");
217 

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