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Denis Turischeve82c60a2010-02-19 11:26:25 +01001/*
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/init.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/acpi.h>
31#include <linux/pci.h>
32#include <linux/mfd/core.h>
33
34#define SMBASE 0x40
35#define SMBUS_IO_SIZE 64
36
37#define GPIOBASE 0x44
38#define GPIO_IO_SIZE 64
Seth Heasley8ee3c2a2012-04-17 14:09:22 -070039#define GPIO_IO_SIZE_CENTERTON 128
Denis Turischeve82c60a2010-02-19 11:26:25 +010040
Alexander Stein19921ef2011-06-16 13:05:49 +020041#define WDTBASE 0x84
42#define WDT_IO_SIZE 64
43
Denis Turischeve82c60a2010-02-19 11:26:25 +010044static struct resource smbus_sch_resource = {
45 .flags = IORESOURCE_IO,
46};
47
48
49static struct resource gpio_sch_resource = {
50 .flags = IORESOURCE_IO,
51};
52
53static struct mfd_cell lpc_sch_cells[] = {
54 {
55 .name = "isch_smbus",
56 .num_resources = 1,
57 .resources = &smbus_sch_resource,
58 },
59 {
60 .name = "sch_gpio",
61 .num_resources = 1,
62 .resources = &gpio_sch_resource,
63 },
64};
65
Alexander Stein19921ef2011-06-16 13:05:49 +020066static struct resource wdt_sch_resource = {
67 .flags = IORESOURCE_IO,
68};
69
70static struct mfd_cell tunnelcreek_cells[] = {
71 {
Wim Van Sebroeck805b2372012-05-10 20:54:32 +020072 .name = "ie6xx_wdt",
Alexander Stein19921ef2011-06-16 13:05:49 +020073 .num_resources = 1,
74 .resources = &wdt_sch_resource,
75 },
76};
77
Axel Lin61485c62011-12-01 09:41:03 +080078static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
Denis Turischeve82c60a2010-02-19 11:26:25 +010079 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
Denis Turischeve967f772011-03-13 17:28:59 +020080 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
Seth Heasley8ee3c2a2012-04-17 14:09:22 -070081 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB) },
Denis Turischeve82c60a2010-02-19 11:26:25 +010082 { 0, }
83};
84MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
85
86static int __devinit 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;
Denis Turischeve967f772011-03-13 17:28:59 +020091 int i;
Alexander Stein19921ef2011-06-16 13:05:49 +020092 int ret;
Denis Turischeve82c60a2010-02-19 11:26:25 +010093
94 pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
95 if (!(base_addr_cfg & (1 << 31))) {
96 dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
97 return -ENODEV;
98 }
99 base_addr = (unsigned short)base_addr_cfg;
100 if (base_addr == 0) {
101 dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
102 return -ENODEV;
103 }
104
105 smbus_sch_resource.start = base_addr;
106 smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
107
108 pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
109 if (!(base_addr_cfg & (1 << 31))) {
110 dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
111 return -ENODEV;
112 }
113 base_addr = (unsigned short)base_addr_cfg;
114 if (base_addr == 0) {
115 dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
116 return -ENODEV;
117 }
118
119 gpio_sch_resource.start = base_addr;
Seth Heasley8ee3c2a2012-04-17 14:09:22 -0700120
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;
Denis Turischeve82c60a2010-02-19 11:26:25 +0100125
Denis Turischeve967f772011-03-13 17:28:59 +0200126 for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
127 lpc_sch_cells[i].id = id->device;
128
Alexander Stein19921ef2011-06-16 13:05:49 +0200129 ret = mfd_add_devices(&dev->dev, 0,
Denis Turischeve82c60a2010-02-19 11:26:25 +0100130 lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
Alexander Stein19921ef2011-06-16 13:05:49 +0200131 if (ret)
132 goto out_dev;
133
Seth Heasley8ee3c2a2012-04-17 14:09:22 -0700134 if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC
135 || id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB) {
Alexander Stein19921ef2011-06-16 13:05:49 +0200136 pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
137 if (!(base_addr_cfg & (1 << 31))) {
138 dev_err(&dev->dev, "Decode of the WDT I/O range disabled\n");
139 ret = -ENODEV;
140 goto out_dev;
141 }
142 base_addr = (unsigned short)base_addr_cfg;
143 if (base_addr == 0) {
144 dev_err(&dev->dev, "I/O space for WDT uninitialized\n");
145 ret = -ENODEV;
146 goto out_dev;
147 }
148
149 wdt_sch_resource.start = base_addr;
150 wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
151
152 for (i = 0; i < ARRAY_SIZE(tunnelcreek_cells); i++)
153 tunnelcreek_cells[i].id = id->device;
154
155 ret = mfd_add_devices(&dev->dev, 0, tunnelcreek_cells,
156 ARRAY_SIZE(tunnelcreek_cells), NULL, 0);
157 }
158
159 return ret;
160out_dev:
161 mfd_remove_devices(&dev->dev);
162 return ret;
Denis Turischeve82c60a2010-02-19 11:26:25 +0100163}
164
165static void __devexit lpc_sch_remove(struct pci_dev *dev)
166{
167 mfd_remove_devices(&dev->dev);
168}
169
170static struct pci_driver lpc_sch_driver = {
171 .name = "lpc_sch",
172 .id_table = lpc_sch_ids,
173 .probe = lpc_sch_probe,
174 .remove = __devexit_p(lpc_sch_remove),
175};
176
Axel Lin38a36f52012-04-03 09:09:19 +0800177module_pci_driver(lpc_sch_driver);
Denis Turischeve82c60a2010-02-19 11:26:25 +0100178
179MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
180MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
181MODULE_LICENSE("GPL");