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12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/pci.h>
15#include <linux/mfd/core.h>
16#include <linux/clkdev.h>
17#include <linux/clk-provider.h>
18#include <linux/dmi.h>
19#include <linux/i2c.h>
20#include <linux/platform_data/gpio-dwapb.h>
21#include <linux/property.h>
22
23
24#define MFD_I2C_BAR 0
25#define MFD_GPIO_BAR 1
26
27
28#define MFD_ACPI_MATCH_GPIO 0ULL
29#define MFD_ACPI_MATCH_I2C 1ULL
30
31
32#define INTEL_QUARK_MFD_GPIO_BASE 8
33
34
35#define INTEL_QUARK_MFD_NGPIO 8
36
37
38#define INTEL_QUARK_GPIO_NPORTS 1
39
40#define INTEL_QUARK_IORES_MEM 0
41#define INTEL_QUARK_IORES_IRQ 1
42
43#define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0"
44
45
46#define INTEL_QUARK_I2C_CLK_HZ 33000000
47
48struct intel_quark_mfd {
49 struct clk *i2c_clk;
50 struct clk_lookup *i2c_clk_lookup;
51};
52
53static const struct property_entry intel_quark_i2c_controller_standard_properties[] = {
54 PROPERTY_ENTRY_U32("clock-frequency", I2C_MAX_STANDARD_MODE_FREQ),
55 { }
56};
57
58static const struct software_node intel_quark_i2c_controller_standard_node = {
59 .name = "intel-quark-i2c-controller",
60 .properties = intel_quark_i2c_controller_standard_properties,
61};
62
63static const struct property_entry intel_quark_i2c_controller_fast_properties[] = {
64 PROPERTY_ENTRY_U32("clock-frequency", I2C_MAX_FAST_MODE_FREQ),
65 { }
66};
67
68static const struct software_node intel_quark_i2c_controller_fast_node = {
69 .name = "intel-quark-i2c-controller",
70 .properties = intel_quark_i2c_controller_fast_properties,
71};
72
73static const struct dmi_system_id dmi_platform_info[] = {
74 {
75 .matches = {
76 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
77 },
78 .driver_data = (void *)&intel_quark_i2c_controller_standard_node,
79 },
80 {
81 .matches = {
82 DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
83 },
84 .driver_data = (void *)&intel_quark_i2c_controller_fast_node,
85 },
86 {
87 .matches = {
88 DMI_EXACT_MATCH(DMI_BOARD_NAME, "SIMATIC IOT2000"),
89 },
90 .driver_data = (void *)&intel_quark_i2c_controller_fast_node,
91 },
92 {}
93};
94
95
96static struct resource intel_quark_i2c_res[] = {
97 [INTEL_QUARK_IORES_MEM] = {
98 .flags = IORESOURCE_MEM,
99 },
100 [INTEL_QUARK_IORES_IRQ] = {
101 .flags = IORESOURCE_IRQ,
102 },
103};
104
105static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = {
106 .adr = MFD_ACPI_MATCH_I2C,
107};
108
109
110static struct resource intel_quark_gpio_res[] = {
111 [INTEL_QUARK_IORES_MEM] = {
112 .flags = IORESOURCE_MEM,
113 },
114};
115
116static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
117 .adr = MFD_ACPI_MATCH_GPIO,
118};
119
120static struct mfd_cell intel_quark_mfd_cells[] = {
121 [MFD_I2C_BAR] = {
122 .id = MFD_I2C_BAR,
123 .name = "i2c_designware",
124 .acpi_match = &intel_quark_acpi_match_i2c,
125 .num_resources = ARRAY_SIZE(intel_quark_i2c_res),
126 .resources = intel_quark_i2c_res,
127 .ignore_resource_conflicts = true,
128 },
129 [MFD_GPIO_BAR] = {
130 .id = MFD_GPIO_BAR,
131 .name = "gpio-dwapb",
132 .acpi_match = &intel_quark_acpi_match_gpio,
133 .num_resources = ARRAY_SIZE(intel_quark_gpio_res),
134 .resources = intel_quark_gpio_res,
135 .ignore_resource_conflicts = true,
136 },
137};
138
139static const struct pci_device_id intel_quark_mfd_ids[] = {
140 { PCI_VDEVICE(INTEL, 0x0934), },
141 {},
142};
143MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);
144
145static int intel_quark_register_i2c_clk(struct device *dev)
146{
147 struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);
148 struct clk *i2c_clk;
149
150 i2c_clk = clk_register_fixed_rate(dev,
151 INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,
152 0, INTEL_QUARK_I2C_CLK_HZ);
153 if (IS_ERR(i2c_clk))
154 return PTR_ERR(i2c_clk);
155
156 quark_mfd->i2c_clk = i2c_clk;
157 quark_mfd->i2c_clk_lookup = clkdev_create(i2c_clk, NULL,
158 INTEL_QUARK_I2C_CONTROLLER_CLK);
159
160 if (!quark_mfd->i2c_clk_lookup) {
161 clk_unregister(quark_mfd->i2c_clk);
162 dev_err(dev, "Fixed clk register failed\n");
163 return -ENOMEM;
164 }
165
166 return 0;
167}
168
169static void intel_quark_unregister_i2c_clk(struct device *dev)
170{
171 struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);
172
173 if (!quark_mfd->i2c_clk_lookup)
174 return;
175
176 clkdev_drop(quark_mfd->i2c_clk_lookup);
177 clk_unregister(quark_mfd->i2c_clk);
178}
179
180static int intel_quark_i2c_setup(struct pci_dev *pdev)
181{
182 struct mfd_cell *cell = &intel_quark_mfd_cells[MFD_I2C_BAR];
183 struct resource *res = intel_quark_i2c_res;
184 const struct dmi_system_id *dmi_id;
185
186 res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_I2C_BAR);
187 res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_I2C_BAR);
188
189 res[INTEL_QUARK_IORES_IRQ].start = pci_irq_vector(pdev, 0);
190 res[INTEL_QUARK_IORES_IRQ].end = pci_irq_vector(pdev, 0);
191
192
193 cell->swnode = &intel_quark_i2c_controller_standard_node;
194
195 dmi_id = dmi_first_match(dmi_platform_info);
196 if (dmi_id)
197 cell->swnode = (struct software_node *)dmi_id->driver_data;
198
199 return 0;
200}
201
202static int intel_quark_gpio_setup(struct pci_dev *pdev)
203{
204 struct mfd_cell *cell = &intel_quark_mfd_cells[MFD_GPIO_BAR];
205 struct resource *res = intel_quark_gpio_res;
206 struct dwapb_platform_data *pdata;
207 struct device *dev = &pdev->dev;
208
209 res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, MFD_GPIO_BAR);
210 res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, MFD_GPIO_BAR);
211
212 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
213 if (!pdata)
214 return -ENOMEM;
215
216
217 pdata->nports = INTEL_QUARK_GPIO_NPORTS;
218 pdata->properties = devm_kcalloc(dev, pdata->nports,
219 sizeof(*pdata->properties),
220 GFP_KERNEL);
221 if (!pdata->properties)
222 return -ENOMEM;
223
224
225 pdata->properties->fwnode = NULL;
226 pdata->properties->idx = 0;
227 pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO;
228 pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE;
229 pdata->properties->irq[0] = pci_irq_vector(pdev, 0);
230 pdata->properties->irq_shared = true;
231
232 cell->platform_data = pdata;
233 cell->pdata_size = sizeof(*pdata);
234
235 return 0;
236}
237
238static int intel_quark_mfd_probe(struct pci_dev *pdev,
239 const struct pci_device_id *id)
240{
241 struct intel_quark_mfd *quark_mfd;
242 int ret;
243
244 ret = pcim_enable_device(pdev);
245 if (ret)
246 return ret;
247
248 quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL);
249 if (!quark_mfd)
250 return -ENOMEM;
251
252 dev_set_drvdata(&pdev->dev, quark_mfd);
253
254 ret = intel_quark_register_i2c_clk(&pdev->dev);
255 if (ret)
256 return ret;
257
258 pci_set_master(pdev);
259
260
261 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
262 if (ret < 0)
263 goto err_unregister_i2c_clk;
264
265 ret = intel_quark_i2c_setup(pdev);
266 if (ret)
267 goto err_free_irq_vectors;
268
269 ret = intel_quark_gpio_setup(pdev);
270 if (ret)
271 goto err_free_irq_vectors;
272
273 ret = mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
274 ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
275 NULL);
276 if (ret)
277 goto err_free_irq_vectors;
278
279 return 0;
280
281err_free_irq_vectors:
282 pci_free_irq_vectors(pdev);
283err_unregister_i2c_clk:
284 intel_quark_unregister_i2c_clk(&pdev->dev);
285 return ret;
286}
287
288static void intel_quark_mfd_remove(struct pci_dev *pdev)
289{
290 mfd_remove_devices(&pdev->dev);
291 pci_free_irq_vectors(pdev);
292 intel_quark_unregister_i2c_clk(&pdev->dev);
293}
294
295static struct pci_driver intel_quark_mfd_driver = {
296 .name = "intel_quark_mfd_i2c_gpio",
297 .id_table = intel_quark_mfd_ids,
298 .probe = intel_quark_mfd_probe,
299 .remove = intel_quark_mfd_remove,
300};
301
302module_pci_driver(intel_quark_mfd_driver);
303
304MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
305MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO");
306MODULE_LICENSE("GPL v2");
307
