1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/pci.h>
23#include <linux/mfd/core.h>
24#include <linux/clkdev.h>
25#include <linux/clk-provider.h>
26#include <linux/dmi.h>
27#include <linux/platform_data/gpio-dwapb.h>
28#include <linux/platform_data/i2c-designware.h>
29
30
31#define MFD_I2C_BAR 0
32#define MFD_GPIO_BAR 1
33
34
35#define MFD_ACPI_MATCH_GPIO 0ULL
36#define MFD_ACPI_MATCH_I2C 1ULL
37
38
39#define INTEL_QUARK_MFD_GPIO_BASE 8
40
41
42#define INTEL_QUARK_MFD_NGPIO 8
43
44
45#define INTEL_QUARK_GPIO_NPORTS 1
46
47#define INTEL_QUARK_IORES_MEM 0
48#define INTEL_QUARK_IORES_IRQ 1
49
50#define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0"
51
52
53#define INTEL_QUARK_I2C_CLK_HZ 33000000
54
55struct intel_quark_mfd {
56 struct pci_dev *pdev;
57 struct clk *i2c_clk;
58 struct clk_lookup *i2c_clk_lookup;
59};
60
61struct i2c_mode_info {
62 const char *name;
63 unsigned int i2c_scl_freq;
64};
65
66static const struct i2c_mode_info platform_i2c_mode_info[] = {
67 {
68 .name = "Galileo",
69 .i2c_scl_freq = 100000,
70 },
71 {
72 .name = "GalileoGen2",
73 .i2c_scl_freq = 400000,
74 },
75 {}
76};
77
78static struct resource intel_quark_i2c_res[] = {
79 [INTEL_QUARK_IORES_MEM] = {
80 .flags = IORESOURCE_MEM,
81 },
82 [INTEL_QUARK_IORES_IRQ] = {
83 .flags = IORESOURCE_IRQ,
84 },
85};
86
87static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = {
88 .adr = MFD_ACPI_MATCH_I2C,
89};
90
91static struct resource intel_quark_gpio_res[] = {
92 [INTEL_QUARK_IORES_MEM] = {
93 .flags = IORESOURCE_MEM,
94 },
95};
96
97static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
98 .adr = MFD_ACPI_MATCH_GPIO,
99};
100
101static struct mfd_cell intel_quark_mfd_cells[] = {
102 {
103 .id = MFD_GPIO_BAR,
104 .name = "gpio-dwapb",
105 .acpi_match = &intel_quark_acpi_match_gpio,
106 .num_resources = ARRAY_SIZE(intel_quark_gpio_res),
107 .resources = intel_quark_gpio_res,
108 .ignore_resource_conflicts = true,
109 },
110 {
111 .id = MFD_I2C_BAR,
112 .name = "i2c_designware",
113 .acpi_match = &intel_quark_acpi_match_i2c,
114 .num_resources = ARRAY_SIZE(intel_quark_i2c_res),
115 .resources = intel_quark_i2c_res,
116 .ignore_resource_conflicts = true,
117 },
118};
119
120static const struct pci_device_id intel_quark_mfd_ids[] = {
121 { PCI_VDEVICE(INTEL, 0x0934), },
122 {},
123};
124MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);
125
126static int intel_quark_register_i2c_clk(struct intel_quark_mfd *quark_mfd)
127{
128 struct pci_dev *pdev = quark_mfd->pdev;
129 struct clk *i2c_clk;
130
131 i2c_clk = clk_register_fixed_rate(&pdev->dev,
132 INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,
133 CLK_IS_ROOT, INTEL_QUARK_I2C_CLK_HZ);
134 if (IS_ERR(i2c_clk))
135 return PTR_ERR(i2c_clk);
136
137 quark_mfd->i2c_clk = i2c_clk;
138 quark_mfd->i2c_clk_lookup = clkdev_create(i2c_clk, NULL,
139 INTEL_QUARK_I2C_CONTROLLER_CLK);
140
141 if (!quark_mfd->i2c_clk_lookup) {
142 dev_err(&pdev->dev, "Fixed clk register failed\n");
143 return -ENOMEM;
144 }
145
146 return 0;
147}
148
149static void intel_quark_unregister_i2c_clk(struct pci_dev *pdev)
150{
151 struct intel_quark_mfd *quark_mfd = dev_get_drvdata(&pdev->dev);
152
153 if (!quark_mfd->i2c_clk || !quark_mfd->i2c_clk_lookup)
154 return;
155
156 clkdev_drop(quark_mfd->i2c_clk_lookup);
157 clk_unregister(quark_mfd->i2c_clk);
158}
159
160static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
161{
162 const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
163 const struct i2c_mode_info *info;
164 struct dw_i2c_platform_data *pdata;
165 struct resource *res = (struct resource *)cell->resources;
166 struct device *dev = &pdev->dev;
167
168 res[INTEL_QUARK_IORES_MEM].start =
169 pci_resource_start(pdev, MFD_I2C_BAR);
170 res[INTEL_QUARK_IORES_MEM].end =
171 pci_resource_end(pdev, MFD_I2C_BAR);
172
173 res[INTEL_QUARK_IORES_IRQ].start = pdev->irq;
174 res[INTEL_QUARK_IORES_IRQ].end = pdev->irq;
175
176 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
177 if (!pdata)
178 return -ENOMEM;
179
180
181 pdata->i2c_scl_freq = 100000;
182
183 if (board_name) {
184 for (info = platform_i2c_mode_info; info->name; info++) {
185 if (!strcmp(board_name, info->name)) {
186 pdata->i2c_scl_freq = info->i2c_scl_freq;
187 break;
188 }
189 }
190 }
191
192 cell->platform_data = pdata;
193 cell->pdata_size = sizeof(*pdata);
194
195 return 0;
196}
197
198static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell)
199{
200 struct dwapb_platform_data *pdata;
201 struct resource *res = (struct resource *)cell->resources;
202 struct device *dev = &pdev->dev;
203
204 res[INTEL_QUARK_IORES_MEM].start =
205 pci_resource_start(pdev, MFD_GPIO_BAR);
206 res[INTEL_QUARK_IORES_MEM].end =
207 pci_resource_end(pdev, MFD_GPIO_BAR);
208
209 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
210 if (!pdata)
211 return -ENOMEM;
212
213
214 pdata->nports = INTEL_QUARK_GPIO_NPORTS;
215 pdata->properties = devm_kcalloc(dev, pdata->nports,
216 sizeof(*pdata->properties),
217 GFP_KERNEL);
218 if (!pdata->properties)
219 return -ENOMEM;
220
221
222 pdata->properties->node = NULL;
223 pdata->properties->name = "intel-quark-x1000-gpio-portA";
224 pdata->properties->idx = 0;
225 pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO;
226 pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE;
227 pdata->properties->irq = pdev->irq;
228 pdata->properties->irq_shared = true;
229
230 cell->platform_data = pdata;
231 cell->pdata_size = sizeof(*pdata);
232
233 return 0;
234}
235
236static int intel_quark_mfd_probe(struct pci_dev *pdev,
237 const struct pci_device_id *id)
238{
239 struct intel_quark_mfd *quark_mfd;
240 int ret;
241
242 ret = pcim_enable_device(pdev);
243 if (ret)
244 return ret;
245
246 quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL);
247 if (!quark_mfd)
248 return -ENOMEM;
249 quark_mfd->pdev = pdev;
250
251 ret = intel_quark_register_i2c_clk(quark_mfd);
252 if (ret)
253 return ret;
254
255 dev_set_drvdata(&pdev->dev, quark_mfd);
256
257 ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[1]);
258 if (ret)
259 return ret;
260
261 ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[0]);
262 if (ret)
263 return ret;
264
265 return mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
266 ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
267 NULL);
268}
269
270static void intel_quark_mfd_remove(struct pci_dev *pdev)
271{
272 intel_quark_unregister_i2c_clk(pdev);
273 mfd_remove_devices(&pdev->dev);
274}
275
276static struct pci_driver intel_quark_mfd_driver = {
277 .name = "intel_quark_mfd_i2c_gpio",
278 .id_table = intel_quark_mfd_ids,
279 .probe = intel_quark_mfd_probe,
280 .remove = intel_quark_mfd_remove,
281};
282
283module_pci_driver(intel_quark_mfd_driver);
284
285MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
286MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO");
287MODULE_LICENSE("GPL v2");
288
