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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
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,
37 LPC_ITC,
38 LPC_CENTERTON,
39 LPC_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
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");
209
