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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * lpc_sch.c - LPC interface for Intel Poulsbo SCH
4 *
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.
9 *
10 * Copyright (c) 2010 CompuLab Ltd
11 * Copyright (c) 2014 Intel Corp.
12 * Author: Denis Turischev <denis@compulab.co.il>
13 */
14
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>
21
22#define SMBASE 0x40
23#define SMBUS_IO_SIZE 64
24
25#define GPIOBASE 0x44
26#define GPIO_IO_SIZE 64
27#define GPIO_IO_SIZE_CENTERTON 128
28
29/* Intel Quark X1000 GPIO IRQ Number */
30#define GPIO_IRQ_QUARK_X1000 9
31
32#define WDTBASE 0x84
33#define WDT_IO_SIZE 64
34
35enum sch_chipsets {
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 */
40};
41
42struct lpc_sch_info {
43 unsigned int io_size_smbus;
44 unsigned int io_size_gpio;
45 unsigned int io_size_wdt;
46 int irq_gpio;
47};
48
49static struct lpc_sch_info sch_chipset_info[] = {
50 [LPC_SCH] = {
51 .io_size_smbus = SMBUS_IO_SIZE,
52 .io_size_gpio = GPIO_IO_SIZE,
53 .irq_gpio = -1,
54 },
55 [LPC_ITC] = {
56 .io_size_smbus = SMBUS_IO_SIZE,
57 .io_size_gpio = GPIO_IO_SIZE,
58 .io_size_wdt = WDT_IO_SIZE,
59 .irq_gpio = -1,
60 },
61 [LPC_CENTERTON] = {
62 .io_size_smbus = SMBUS_IO_SIZE,
63 .io_size_gpio = GPIO_IO_SIZE_CENTERTON,
64 .io_size_wdt = WDT_IO_SIZE,
65 .irq_gpio = -1,
66 },
67 [LPC_QUARK_X1000] = {
68 .io_size_gpio = GPIO_IO_SIZE,
69 .irq_gpio = GPIO_IRQ_QUARK_X1000,
70 .io_size_wdt = WDT_IO_SIZE,
71 },
72};
73
74static 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 },
79 { 0, }
80};
81MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
82
83#define LPC_NO_RESOURCE 1
84#define LPC_SKIP_RESOURCE 2
85
86static int lpc_sch_get_io(struct pci_dev *pdev, int where, const char *name,
87 struct resource *res, int size)
88{
89 unsigned int base_addr_cfg;
90 unsigned short base_addr;
91
92 if (size == 0)
93 return LPC_NO_RESOURCE;
94
95 pci_read_config_dword(pdev, where, &base_addr_cfg);
96 base_addr = 0;
97 if (!(base_addr_cfg & (1 << 31)))
98 dev_warn(&pdev->dev, "Decode of the %s I/O range disabled\n",
99 name);
100 else
101 base_addr = (unsigned short)base_addr_cfg;
102
103 if (base_addr == 0) {
104 dev_warn(&pdev->dev, "I/O space for %s uninitialized\n", name);
105 return LPC_SKIP_RESOURCE;
106 }
107
108 res->start = base_addr;
109 res->end = base_addr + size - 1;
110 res->flags = IORESOURCE_IO;
111
112 return 0;
113}
114
115static 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)
118{
119 struct resource *res;
120 int ret;
121
122 res = devm_kcalloc(&pdev->dev, 2, sizeof(*res), GFP_KERNEL);
123 if (!res)
124 return -ENOMEM;
125
126 ret = lpc_sch_get_io(pdev, where, name, res, size);
127 if (ret)
128 return ret;
129
130 memset(cell, 0, sizeof(*cell));
131
132 cell->name = name;
133 cell->resources = res;
134 cell->num_resources = 1;
135 cell->ignore_resource_conflicts = true;
136 cell->id = id;
137
138 /* Check if we need to add an IRQ resource */
139 if (irq < 0)
140 return 0;
141
142 res++;
143
144 res->start = irq;
145 res->end = irq;
146 res->flags = IORESOURCE_IRQ;
147
148 cell->num_resources++;
149
150 return 0;
151}
152
153static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id)
154{
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;
158 int ret;
159
160 ret = lpc_sch_populate_cell(dev, SMBASE, "isch_smbus",
161 info->io_size_smbus, -1,
162 id->device, &lpc_sch_cells[cells]);
163 if (ret < 0)
164 return ret;
165 if (ret == 0)
166 cells++;
167
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]);
171 if (ret < 0)
172 return ret;
173 if (ret == 0)
174 cells++;
175
176 ret = lpc_sch_populate_cell(dev, WDTBASE, "ie6xx_wdt",
177 info->io_size_wdt, -1,
178 id->device, &lpc_sch_cells[cells]);
179 if (ret < 0)
180 return ret;
181 if (ret == 0)
182 cells++;
183
184 if (cells == 0) {
185 dev_err(&dev->dev, "All decode registers disabled.\n");
186 return -ENODEV;
187 }
188
189 return mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
190}
191
192static void lpc_sch_remove(struct pci_dev *dev)
193{
194 mfd_remove_devices(&dev->dev);
195}
196
197static struct pci_driver lpc_sch_driver = {
198 .name = "lpc_sch",
199 .id_table = lpc_sch_ids,
200 .probe = lpc_sch_probe,
201 .remove = lpc_sch_remove,
202};
203
204module_pci_driver(lpc_sch_driver);
205
206MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
207MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
208MODULE_LICENSE("GPL");
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
43static struct resource smbus_sch_resource = {
44 .flags = IORESOURCE_IO,
45};
46
47static struct resource gpio_sch_resource = {
48 .flags = IORESOURCE_IO,
49};
50
51static struct resource wdt_sch_resource = {
52 .flags = IORESOURCE_IO,
53};
54
55static struct mfd_cell lpc_sch_cells[3];
56
57static 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
64static 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
71static 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
78static 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};
84MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
85
86static 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
164static void lpc_sch_remove(struct pci_dev *dev)
165{
166 mfd_remove_devices(&dev->dev);
167}
168
169static 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
176module_pci_driver(lpc_sch_driver);
177
178MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
179MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
180MODULE_LICENSE("GPL");