1 // SPDX-License-Identifier: GPL-2.0-only
3 * lpc_sch.c - LPC interface for Intel Poulsbo SCH
5 * LPC bridge function of the Intel SCH contains many other
6 * functional units, such as Interrupt controllers, Timers,
7 * Power Management, System Management, GPIO, RTC, and LPC
8 * Configuration Registers.
10 * Copyright (c) 2010 CompuLab Ltd
11 * Copyright (c) 2014 Intel Corp.
12 * Author: Denis Turischev <denis@compulab.co.il>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/errno.h>
18 #include <linux/acpi.h>
19 #include <linux/pci.h>
20 #include <linux/mfd/core.h>
23 #define SMBUS_IO_SIZE 64
26 #define GPIO_IO_SIZE 64
27 #define GPIO_IO_SIZE_CENTERTON 128
29 /* Intel Quark X1000 GPIO IRQ Number */
30 #define GPIO_IRQ_QUARK_X1000 9
33 #define WDT_IO_SIZE 64
36 LPC_SCH = 0, /* Intel Poulsbo SCH */
37 LPC_ITC, /* Intel Tunnel Creek */
38 LPC_CENTERTON, /* Intel Centerton */
39 LPC_QUARK_X1000, /* Intel Quark X1000 */
43 unsigned int io_size_smbus;
44 unsigned int io_size_gpio;
45 unsigned int io_size_wdt;
49 static struct lpc_sch_info sch_chipset_info[] = {
51 .io_size_smbus = SMBUS_IO_SIZE,
52 .io_size_gpio = GPIO_IO_SIZE,
56 .io_size_smbus = SMBUS_IO_SIZE,
57 .io_size_gpio = GPIO_IO_SIZE,
58 .io_size_wdt = WDT_IO_SIZE,
62 .io_size_smbus = SMBUS_IO_SIZE,
63 .io_size_gpio = GPIO_IO_SIZE_CENTERTON,
64 .io_size_wdt = WDT_IO_SIZE,
68 .io_size_gpio = GPIO_IO_SIZE,
69 .irq_gpio = GPIO_IRQ_QUARK_X1000,
70 .io_size_wdt = WDT_IO_SIZE,
74 static const struct pci_device_id lpc_sch_ids[] = {
75 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC), LPC_SCH },
76 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC), LPC_ITC },
77 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB), LPC_CENTERTON },
78 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB), LPC_QUARK_X1000 },
81 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
83 #define LPC_NO_RESOURCE 1
84 #define LPC_SKIP_RESOURCE 2
86 static int lpc_sch_get_io(struct pci_dev *pdev, int where, const char *name,
87 struct resource *res, int size)
89 unsigned int base_addr_cfg;
90 unsigned short base_addr;
93 return LPC_NO_RESOURCE;
95 pci_read_config_dword(pdev, where, &base_addr_cfg);
97 if (!(base_addr_cfg & (1 << 31)))
98 dev_warn(&pdev->dev, "Decode of the %s I/O range disabled\n",
101 base_addr = (unsigned short)base_addr_cfg;
103 if (base_addr == 0) {
104 dev_warn(&pdev->dev, "I/O space for %s uninitialized\n", name);
105 return LPC_SKIP_RESOURCE;
108 res->start = base_addr;
109 res->end = base_addr + size - 1;
110 res->flags = IORESOURCE_IO;
115 static int lpc_sch_populate_cell(struct pci_dev *pdev, int where,
116 const char *name, int size, int irq,
117 int id, struct mfd_cell *cell)
119 struct resource *res;
122 res = devm_kcalloc(&pdev->dev, 2, sizeof(*res), GFP_KERNEL);
126 ret = lpc_sch_get_io(pdev, where, name, res, size);
130 memset(cell, 0, sizeof(*cell));
133 cell->resources = res;
134 cell->num_resources = 1;
135 cell->ignore_resource_conflicts = true;
138 /* Check if we need to add an IRQ resource */
146 res->flags = IORESOURCE_IRQ;
148 cell->num_resources++;
153 static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id)
155 struct mfd_cell lpc_sch_cells[3];
156 struct lpc_sch_info *info = &sch_chipset_info[id->driver_data];
157 unsigned int cells = 0;
160 ret = lpc_sch_populate_cell(dev, SMBASE, "isch_smbus",
161 info->io_size_smbus, -1,
162 id->device, &lpc_sch_cells[cells]);
168 ret = lpc_sch_populate_cell(dev, GPIOBASE, "sch_gpio",
169 info->io_size_gpio, info->irq_gpio,
170 id->device, &lpc_sch_cells[cells]);
176 ret = lpc_sch_populate_cell(dev, WDTBASE, "ie6xx_wdt",
177 info->io_size_wdt, -1,
178 id->device, &lpc_sch_cells[cells]);
185 dev_err(&dev->dev, "All decode registers disabled.\n");
189 return mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
192 static void lpc_sch_remove(struct pci_dev *dev)
194 mfd_remove_devices(&dev->dev);
197 static struct pci_driver lpc_sch_driver = {
199 .id_table = lpc_sch_ids,
200 .probe = lpc_sch_probe,
201 .remove = lpc_sch_remove,
204 module_pci_driver(lpc_sch_driver);
206 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
207 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
208 MODULE_LICENSE("GPL");