2 * lpc_sch.c - LPC interface for Intel Poulsbo SCH
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.
9 * Copyright (c) 2010 CompuLab Ltd
10 * Copyright (c) 2014 Intel Corp.
11 * Author: Denis Turischev <denis@compulab.co.il>
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.
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.
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>
31 #define SMBUS_IO_SIZE 64
34 #define GPIO_IO_SIZE 64
35 #define GPIO_IO_SIZE_CENTERTON 128
37 /* Intel Quark X1000 GPIO IRQ Number */
38 #define GPIO_IRQ_QUARK_X1000 9
41 #define WDT_IO_SIZE 64
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 */
51 unsigned int io_size_smbus;
52 unsigned int io_size_gpio;
53 unsigned int io_size_wdt;
57 static struct lpc_sch_info sch_chipset_info[] = {
59 .io_size_smbus = SMBUS_IO_SIZE,
60 .io_size_gpio = GPIO_IO_SIZE,
64 .io_size_smbus = SMBUS_IO_SIZE,
65 .io_size_gpio = GPIO_IO_SIZE,
66 .io_size_wdt = WDT_IO_SIZE,
70 .io_size_smbus = SMBUS_IO_SIZE,
71 .io_size_gpio = GPIO_IO_SIZE_CENTERTON,
72 .io_size_wdt = WDT_IO_SIZE,
76 .io_size_gpio = GPIO_IO_SIZE,
77 .irq_gpio = GPIO_IRQ_QUARK_X1000,
81 static const struct pci_device_id lpc_sch_ids[] = {
82 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC), LPC_SCH },
83 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC), LPC_ITC },
84 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB), LPC_CENTERTON },
85 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB), LPC_QUARK_X1000 },
88 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
90 #define LPC_NO_RESOURCE 1
91 #define LPC_SKIP_RESOURCE 2
93 static int lpc_sch_get_io(struct pci_dev *pdev, int where, const char *name,
94 struct resource *res, int size)
96 unsigned int base_addr_cfg;
97 unsigned short base_addr;
100 return LPC_NO_RESOURCE;
102 pci_read_config_dword(pdev, where, &base_addr_cfg);
104 if (!(base_addr_cfg & (1 << 31)))
105 dev_warn(&pdev->dev, "Decode of the %s I/O range disabled\n",
108 base_addr = (unsigned short)base_addr_cfg;
110 if (base_addr == 0) {
111 dev_warn(&pdev->dev, "I/O space for %s uninitialized\n", name);
112 return LPC_SKIP_RESOURCE;
115 res->start = base_addr;
116 res->end = base_addr + size - 1;
117 res->flags = IORESOURCE_IO;
122 static int lpc_sch_populate_cell(struct pci_dev *pdev, int where,
123 const char *name, int size, int irq,
124 int id, struct mfd_cell *cell)
126 struct resource *res;
129 res = devm_kcalloc(&pdev->dev, 2, sizeof(*res), GFP_KERNEL);
133 ret = lpc_sch_get_io(pdev, where, name, res, size);
137 memset(cell, 0, sizeof(*cell));
140 cell->resources = res;
141 cell->num_resources = 1;
142 cell->ignore_resource_conflicts = true;
145 /* Check if we need to add an IRQ resource */
153 res->flags = IORESOURCE_IRQ;
155 cell->num_resources++;
160 static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id)
162 struct mfd_cell lpc_sch_cells[3];
163 struct lpc_sch_info *info = &sch_chipset_info[id->driver_data];
164 unsigned int cells = 0;
167 ret = lpc_sch_populate_cell(dev, SMBASE, "isch_smbus",
168 info->io_size_smbus, -1,
169 id->device, &lpc_sch_cells[cells]);
175 ret = lpc_sch_populate_cell(dev, GPIOBASE, "sch_gpio",
176 info->io_size_gpio, info->irq_gpio,
177 id->device, &lpc_sch_cells[cells]);
183 ret = lpc_sch_populate_cell(dev, WDTBASE, "ie6xx_wdt",
184 info->io_size_wdt, -1,
185 id->device, &lpc_sch_cells[cells]);
192 dev_err(&dev->dev, "All decode registers disabled.\n");
196 return mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
199 static void lpc_sch_remove(struct pci_dev *dev)
201 mfd_remove_devices(&dev->dev);
204 static struct pci_driver lpc_sch_driver = {
206 .id_table = lpc_sch_ids,
207 .probe = lpc_sch_probe,
208 .remove = lpc_sch_remove,
211 module_pci_driver(lpc_sch_driver);
213 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
214 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
215 MODULE_LICENSE("GPL");