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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
34/* The base GPIO number under GPIOLIB framework */
35#define INTEL_QUARK_MFD_GPIO_BASE 8
36
37/* The default number of South-Cluster GPIO on Quark. */
38#define INTEL_QUARK_MFD_NGPIO 8
39
40/* The DesignWare GPIO ports on Quark. */
41#define INTEL_QUARK_GPIO_NPORTS 1
42
43#define INTEL_QUARK_IORES_MEM 0
44#define INTEL_QUARK_IORES_IRQ 1
45
46#define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0"
47
48/* The Quark I2C controller source clock */
49#define INTEL_QUARK_I2C_CLK_HZ 33000000
50
51#define INTEL_QUARK_I2C_NCLK 1
52
53struct intel_quark_mfd {
54 struct pci_dev *pdev;
55 struct clk *i2c_clk;
56 struct clk_lookup *i2c_clk_lookup;
57};
58
59struct i2c_mode_info {
60 const char *name;
61 unsigned int i2c_scl_freq;
62};
63
64static const struct i2c_mode_info platform_i2c_mode_info[] = {
65 {
66 .name = "Galileo",
67 .i2c_scl_freq = 100000,
68 },
69 {
70 .name = "GalileoGen2",
71 .i2c_scl_freq = 400000,
72 },
Andy Shevchenkobafc1fa2015-03-25 20:03:55 +020073 {}
Raymond Tan60ae5b92015-02-02 10:52:51 +080074};
75
76static struct resource intel_quark_i2c_res[] = {
77 [INTEL_QUARK_IORES_MEM] = {
78 .flags = IORESOURCE_MEM,
79 },
80 [INTEL_QUARK_IORES_IRQ] = {
81 .flags = IORESOURCE_IRQ,
82 },
83};
84
85static struct resource intel_quark_gpio_res[] = {
86 [INTEL_QUARK_IORES_MEM] = {
87 .flags = IORESOURCE_MEM,
88 },
89};
90
91static struct mfd_cell intel_quark_mfd_cells[] = {
92 {
93 .id = MFD_I2C_BAR,
94 .name = "i2c_designware",
95 .num_resources = ARRAY_SIZE(intel_quark_i2c_res),
96 .resources = intel_quark_i2c_res,
97 .ignore_resource_conflicts = true,
98 },
99 {
100 .id = MFD_GPIO_BAR,
101 .name = "gpio-dwapb",
102 .num_resources = ARRAY_SIZE(intel_quark_gpio_res),
103 .resources = intel_quark_gpio_res,
104 .ignore_resource_conflicts = true,
105 },
106};
107
108static const struct pci_device_id intel_quark_mfd_ids[] = {
109 { PCI_VDEVICE(INTEL, 0x0934), },
110 {},
111};
112MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);
113
114static int intel_quark_register_i2c_clk(struct intel_quark_mfd *quark_mfd)
115{
116 struct pci_dev *pdev = quark_mfd->pdev;
117 struct clk_lookup *i2c_clk_lookup;
118 struct clk *i2c_clk;
119 int ret;
120
121 i2c_clk_lookup = devm_kcalloc(&pdev->dev, INTEL_QUARK_I2C_NCLK,
122 sizeof(*i2c_clk_lookup), GFP_KERNEL);
123 if (!i2c_clk_lookup)
124 return -ENOMEM;
125
126 i2c_clk_lookup[0].dev_id = INTEL_QUARK_I2C_CONTROLLER_CLK;
127
128 i2c_clk = clk_register_fixed_rate(&pdev->dev,
129 INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,
130 CLK_IS_ROOT, INTEL_QUARK_I2C_CLK_HZ);
131
132 quark_mfd->i2c_clk_lookup = i2c_clk_lookup;
133 quark_mfd->i2c_clk = i2c_clk;
134
135 ret = clk_register_clkdevs(i2c_clk, i2c_clk_lookup,
136 INTEL_QUARK_I2C_NCLK);
137 if (ret)
138 dev_err(&pdev->dev, "Fixed clk register failed: %d\n", ret);
139
140 return ret;
141}
142
143static void intel_quark_unregister_i2c_clk(struct pci_dev *pdev)
144{
145 struct intel_quark_mfd *quark_mfd = dev_get_drvdata(&pdev->dev);
146
147 if (!quark_mfd->i2c_clk || !quark_mfd->i2c_clk_lookup)
148 return;
149
150 clkdev_drop(quark_mfd->i2c_clk_lookup);
151 clk_unregister(quark_mfd->i2c_clk);
152}
153
154static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
155{
156 const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
Andy Shevchenkobafc1fa2015-03-25 20:03:55 +0200157 const struct i2c_mode_info *info;
Raymond Tan60ae5b92015-02-02 10:52:51 +0800158 struct dw_i2c_platform_data *pdata;
159 struct resource *res = (struct resource *)cell->resources;
160 struct device *dev = &pdev->dev;
Raymond Tan60ae5b92015-02-02 10:52:51 +0800161
162 res[INTEL_QUARK_IORES_MEM].start =
163 pci_resource_start(pdev, MFD_I2C_BAR);
164 res[INTEL_QUARK_IORES_MEM].end =
165 pci_resource_end(pdev, MFD_I2C_BAR);
166
167 res[INTEL_QUARK_IORES_IRQ].start = pdev->irq;
168 res[INTEL_QUARK_IORES_IRQ].end = pdev->irq;
169
170 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
171 if (!pdata)
172 return -ENOMEM;
173
Andy Shevchenkobafc1fa2015-03-25 20:03:55 +0200174 /* Normal mode by default */
175 pdata->i2c_scl_freq = 100000;
Raymond Tan60ae5b92015-02-02 10:52:51 +0800176
Andy Shevchenkobafc1fa2015-03-25 20:03:55 +0200177 if (board_name) {
178 for (info = platform_i2c_mode_info; info->name; info++) {
179 if (!strcmp(board_name, info->name)) {
180 pdata->i2c_scl_freq = info->i2c_scl_freq;
181 break;
182 }
183 }
184 }
Raymond Tan60ae5b92015-02-02 10:52:51 +0800185
186 cell->platform_data = pdata;
187 cell->pdata_size = sizeof(*pdata);
188
189 return 0;
190}
191
192static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell)
193{
194 struct dwapb_platform_data *pdata;
195 struct resource *res = (struct resource *)cell->resources;
196 struct device *dev = &pdev->dev;
197
198 res[INTEL_QUARK_IORES_MEM].start =
199 pci_resource_start(pdev, MFD_GPIO_BAR);
200 res[INTEL_QUARK_IORES_MEM].end =
201 pci_resource_end(pdev, MFD_GPIO_BAR);
202
203 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
204 if (!pdata)
205 return -ENOMEM;
206
207 /* For intel quark x1000, it has only one port: portA */
208 pdata->nports = INTEL_QUARK_GPIO_NPORTS;
209 pdata->properties = devm_kcalloc(dev, pdata->nports,
210 sizeof(*pdata->properties),
211 GFP_KERNEL);
212 if (!pdata->properties)
213 return -ENOMEM;
214
215 /* Set the properties for portA */
216 pdata->properties->node = NULL;
217 pdata->properties->name = "intel-quark-x1000-gpio-portA";
218 pdata->properties->idx = 0;
219 pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO;
220 pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE;
221 pdata->properties->irq = pdev->irq;
222 pdata->properties->irq_shared = true;
223
224 cell->platform_data = pdata;
225 cell->pdata_size = sizeof(*pdata);
226
227 return 0;
228}
229
230static int intel_quark_mfd_probe(struct pci_dev *pdev,
231 const struct pci_device_id *id)
232{
233 struct intel_quark_mfd *quark_mfd;
234 int ret;
235
236 ret = pcim_enable_device(pdev);
237 if (ret)
238 return ret;
239
240 quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL);
241 if (!quark_mfd)
242 return -ENOMEM;
243 quark_mfd->pdev = pdev;
244
245 ret = intel_quark_register_i2c_clk(quark_mfd);
246 if (ret)
247 return ret;
248
249 dev_set_drvdata(&pdev->dev, quark_mfd);
250
251 ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[MFD_I2C_BAR]);
252 if (ret)
253 return ret;
254
255 ret = intel_quark_gpio_setup(pdev,
256 &intel_quark_mfd_cells[MFD_GPIO_BAR]);
257 if (ret)
258 return ret;
259
260 return mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
261 ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
262 NULL);
263}
264
265static void intel_quark_mfd_remove(struct pci_dev *pdev)
266{
267 intel_quark_unregister_i2c_clk(pdev);
268 mfd_remove_devices(&pdev->dev);
269}
270
271static struct pci_driver intel_quark_mfd_driver = {
272 .name = "intel_quark_mfd_i2c_gpio",
273 .id_table = intel_quark_mfd_ids,
274 .probe = intel_quark_mfd_probe,
275 .remove = intel_quark_mfd_remove,
276};
277
278module_pci_driver(intel_quark_mfd_driver);
279
280MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
281MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO");
282MODULE_LICENSE("GPL v2");