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Raymond Tan60ae5b92015-02-02 10:52:51 +08001/*
2 * Intel Quark MFD PCI driver for I2C & GPIO
3 *
4 * Copyright(c) 2014 Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * Intel Quark PCI device for I2C and GPIO controller sharing the same
16 * PCI function. This PCI driver will split the 2 devices into their
17 * respective drivers.
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/* PCI BAR for register base address */
31#define MFD_I2C_BAR 0
32#define MFD_GPIO_BAR 1
33
Andy Shevchenko918fe702015-10-23 12:16:43 +030034/* ACPI _ADR value to match the child node */
35#define MFD_ACPI_MATCH_GPIO 0ULL
36#define MFD_ACPI_MATCH_I2C 1ULL
37
Raymond Tan60ae5b92015-02-02 10:52:51 +080038/* The base GPIO number under GPIOLIB framework */
39#define INTEL_QUARK_MFD_GPIO_BASE 8
40
41/* The default number of South-Cluster GPIO on Quark. */
42#define INTEL_QUARK_MFD_NGPIO 8
43
44/* The DesignWare GPIO ports on Quark. */
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/* The Quark I2C controller source clock */
53#define INTEL_QUARK_I2C_CLK_HZ 33000000
54
55#define INTEL_QUARK_I2C_NCLK 1
56
57struct intel_quark_mfd {
58 struct pci_dev *pdev;
59 struct clk *i2c_clk;
60 struct clk_lookup *i2c_clk_lookup;
61};
62
63struct i2c_mode_info {
64 const char *name;
65 unsigned int i2c_scl_freq;
66};
67
68static const struct i2c_mode_info platform_i2c_mode_info[] = {
69 {
70 .name = "Galileo",
71 .i2c_scl_freq = 100000,
72 },
73 {
74 .name = "GalileoGen2",
75 .i2c_scl_freq = 400000,
76 },
Andy Shevchenkobafc1fa2015-03-25 20:03:55 +020077 {}
Raymond Tan60ae5b92015-02-02 10:52:51 +080078};
79
80static struct resource intel_quark_i2c_res[] = {
81 [INTEL_QUARK_IORES_MEM] = {
82 .flags = IORESOURCE_MEM,
83 },
84 [INTEL_QUARK_IORES_IRQ] = {
85 .flags = IORESOURCE_IRQ,
86 },
87};
88
Andy Shevchenko918fe702015-10-23 12:16:43 +030089static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = {
90 .adr = MFD_ACPI_MATCH_I2C,
91};
92
Raymond Tan60ae5b92015-02-02 10:52:51 +080093static struct resource intel_quark_gpio_res[] = {
94 [INTEL_QUARK_IORES_MEM] = {
95 .flags = IORESOURCE_MEM,
96 },
97};
98
Andy Shevchenko918fe702015-10-23 12:16:43 +030099static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
100 .adr = MFD_ACPI_MATCH_GPIO,
101};
102
Raymond Tan60ae5b92015-02-02 10:52:51 +0800103static struct mfd_cell intel_quark_mfd_cells[] = {
104 {
Raymond Tan60ae5b92015-02-02 10:52:51 +0800105 .id = MFD_GPIO_BAR,
106 .name = "gpio-dwapb",
Andy Shevchenko918fe702015-10-23 12:16:43 +0300107 .acpi_match = &intel_quark_acpi_match_gpio,
Raymond Tan60ae5b92015-02-02 10:52:51 +0800108 .num_resources = ARRAY_SIZE(intel_quark_gpio_res),
109 .resources = intel_quark_gpio_res,
110 .ignore_resource_conflicts = true,
111 },
Andy Shevchenko236fd462015-10-23 12:16:42 +0300112 {
113 .id = MFD_I2C_BAR,
114 .name = "i2c_designware",
Andy Shevchenko918fe702015-10-23 12:16:43 +0300115 .acpi_match = &intel_quark_acpi_match_i2c,
Andy Shevchenko236fd462015-10-23 12:16:42 +0300116 .num_resources = ARRAY_SIZE(intel_quark_i2c_res),
117 .resources = intel_quark_i2c_res,
118 .ignore_resource_conflicts = true,
119 },
Raymond Tan60ae5b92015-02-02 10:52:51 +0800120};
121
122static const struct pci_device_id intel_quark_mfd_ids[] = {
123 { PCI_VDEVICE(INTEL, 0x0934), },
124 {},
125};
126MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);
127
128static int intel_quark_register_i2c_clk(struct intel_quark_mfd *quark_mfd)
129{
130 struct pci_dev *pdev = quark_mfd->pdev;
131 struct clk_lookup *i2c_clk_lookup;
132 struct clk *i2c_clk;
133 int ret;
134
135 i2c_clk_lookup = devm_kcalloc(&pdev->dev, INTEL_QUARK_I2C_NCLK,
136 sizeof(*i2c_clk_lookup), GFP_KERNEL);
137 if (!i2c_clk_lookup)
138 return -ENOMEM;
139
140 i2c_clk_lookup[0].dev_id = INTEL_QUARK_I2C_CONTROLLER_CLK;
141
142 i2c_clk = clk_register_fixed_rate(&pdev->dev,
143 INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,
144 CLK_IS_ROOT, INTEL_QUARK_I2C_CLK_HZ);
145
146 quark_mfd->i2c_clk_lookup = i2c_clk_lookup;
147 quark_mfd->i2c_clk = i2c_clk;
148
149 ret = clk_register_clkdevs(i2c_clk, i2c_clk_lookup,
150 INTEL_QUARK_I2C_NCLK);
151 if (ret)
152 dev_err(&pdev->dev, "Fixed clk register failed: %d\n", ret);
153
154 return ret;
155}
156
157static void intel_quark_unregister_i2c_clk(struct pci_dev *pdev)
158{
159 struct intel_quark_mfd *quark_mfd = dev_get_drvdata(&pdev->dev);
160
161 if (!quark_mfd->i2c_clk || !quark_mfd->i2c_clk_lookup)
162 return;
163
164 clkdev_drop(quark_mfd->i2c_clk_lookup);
165 clk_unregister(quark_mfd->i2c_clk);
166}
167
168static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
169{
170 const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
Andy Shevchenkobafc1fa2015-03-25 20:03:55 +0200171 const struct i2c_mode_info *info;
Raymond Tan60ae5b92015-02-02 10:52:51 +0800172 struct dw_i2c_platform_data *pdata;
173 struct resource *res = (struct resource *)cell->resources;
174 struct device *dev = &pdev->dev;
Raymond Tan60ae5b92015-02-02 10:52:51 +0800175
176 res[INTEL_QUARK_IORES_MEM].start =
177 pci_resource_start(pdev, MFD_I2C_BAR);
178 res[INTEL_QUARK_IORES_MEM].end =
179 pci_resource_end(pdev, MFD_I2C_BAR);
180
181 res[INTEL_QUARK_IORES_IRQ].start = pdev->irq;
182 res[INTEL_QUARK_IORES_IRQ].end = pdev->irq;
183
184 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
185 if (!pdata)
186 return -ENOMEM;
187
Andy Shevchenkobafc1fa2015-03-25 20:03:55 +0200188 /* Normal mode by default */
189 pdata->i2c_scl_freq = 100000;
Raymond Tan60ae5b92015-02-02 10:52:51 +0800190
Andy Shevchenkobafc1fa2015-03-25 20:03:55 +0200191 if (board_name) {
192 for (info = platform_i2c_mode_info; info->name; info++) {
193 if (!strcmp(board_name, info->name)) {
194 pdata->i2c_scl_freq = info->i2c_scl_freq;
195 break;
196 }
197 }
198 }
Raymond Tan60ae5b92015-02-02 10:52:51 +0800199
200 cell->platform_data = pdata;
201 cell->pdata_size = sizeof(*pdata);
202
203 return 0;
204}
205
206static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell)
207{
208 struct dwapb_platform_data *pdata;
209 struct resource *res = (struct resource *)cell->resources;
210 struct device *dev = &pdev->dev;
211
212 res[INTEL_QUARK_IORES_MEM].start =
213 pci_resource_start(pdev, MFD_GPIO_BAR);
214 res[INTEL_QUARK_IORES_MEM].end =
215 pci_resource_end(pdev, MFD_GPIO_BAR);
216
217 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
218 if (!pdata)
219 return -ENOMEM;
220
221 /* For intel quark x1000, it has only one port: portA */
222 pdata->nports = INTEL_QUARK_GPIO_NPORTS;
223 pdata->properties = devm_kcalloc(dev, pdata->nports,
224 sizeof(*pdata->properties),
225 GFP_KERNEL);
226 if (!pdata->properties)
227 return -ENOMEM;
228
229 /* Set the properties for portA */
230 pdata->properties->node = NULL;
231 pdata->properties->name = "intel-quark-x1000-gpio-portA";
232 pdata->properties->idx = 0;
233 pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO;
234 pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE;
235 pdata->properties->irq = pdev->irq;
236 pdata->properties->irq_shared = true;
237
238 cell->platform_data = pdata;
239 cell->pdata_size = sizeof(*pdata);
240
241 return 0;
242}
243
244static int intel_quark_mfd_probe(struct pci_dev *pdev,
245 const struct pci_device_id *id)
246{
247 struct intel_quark_mfd *quark_mfd;
248 int ret;
249
250 ret = pcim_enable_device(pdev);
251 if (ret)
252 return ret;
253
254 quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL);
255 if (!quark_mfd)
256 return -ENOMEM;
257 quark_mfd->pdev = pdev;
258
259 ret = intel_quark_register_i2c_clk(quark_mfd);
260 if (ret)
261 return ret;
262
263 dev_set_drvdata(&pdev->dev, quark_mfd);
264
Andy Shevchenko236fd462015-10-23 12:16:42 +0300265 ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[1]);
Raymond Tan60ae5b92015-02-02 10:52:51 +0800266 if (ret)
267 return ret;
268
Andy Shevchenko236fd462015-10-23 12:16:42 +0300269 ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[0]);
Raymond Tan60ae5b92015-02-02 10:52:51 +0800270 if (ret)
271 return ret;
272
273 return mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
274 ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
275 NULL);
276}
277
278static void intel_quark_mfd_remove(struct pci_dev *pdev)
279{
280 intel_quark_unregister_i2c_clk(pdev);
281 mfd_remove_devices(&pdev->dev);
282}
283
284static struct pci_driver intel_quark_mfd_driver = {
285 .name = "intel_quark_mfd_i2c_gpio",
286 .id_table = intel_quark_mfd_ids,
287 .probe = intel_quark_mfd_probe,
288 .remove = intel_quark_mfd_remove,
289};
290
291module_pci_driver(intel_quark_mfd_driver);
292
293MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
294MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO");
295MODULE_LICENSE("GPL v2");