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fe20ff5c DB |
1 | /* |
2 | * Synopsys DesignWare I2C adapter driver (master only). | |
3 | * | |
4 | * Based on the TI DAVINCI I2C adapter driver. | |
5 | * | |
6 | * Copyright (C) 2006 Texas Instruments. | |
7 | * Copyright (C) 2007 MontaVista Software Inc. | |
8 | * Copyright (C) 2009 Provigent Ltd. | |
a93ac578 | 9 | * Copyright (C) 2011, 2015 Intel Corporation. |
fe20ff5c DB |
10 | * |
11 | * ---------------------------------------------------------------------------- | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
fe20ff5c DB |
22 | * ---------------------------------------------------------------------------- |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/i2c.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/sched.h> | |
32 | #include <linux/err.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/io.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/pci.h> | |
18dbdda8 | 37 | #include <linux/pm_runtime.h> |
8eb5c87a | 38 | #include <linux/acpi.h> |
fe20ff5c DB |
39 | #include "i2c-designware-core.h" |
40 | ||
41 | #define DRIVER_NAME "i2c-designware-pci" | |
42 | ||
43 | enum dw_pci_ctl_id_t { | |
fe20ff5c DB |
44 | medfield_0, |
45 | medfield_1, | |
46 | medfield_2, | |
47 | medfield_3, | |
48 | medfield_4, | |
49 | medfield_5, | |
089c729a MW |
50 | |
51 | baytrail, | |
157a801e | 52 | haswell, |
fe20ff5c DB |
53 | }; |
54 | ||
8efd1e9e CCE |
55 | struct dw_scl_sda_cfg { |
56 | u32 ss_hcnt; | |
57 | u32 fs_hcnt; | |
58 | u32 ss_lcnt; | |
59 | u32 fs_lcnt; | |
60 | u32 sda_hold; | |
61 | }; | |
62 | ||
fe20ff5c DB |
63 | struct dw_pci_controller { |
64 | u32 bus_num; | |
65 | u32 bus_cfg; | |
66 | u32 tx_fifo_depth; | |
67 | u32 rx_fifo_depth; | |
68 | u32 clk_khz; | |
ceccd298 | 69 | u32 functionality; |
8efd1e9e | 70 | struct dw_scl_sda_cfg *scl_sda_cfg; |
fe20ff5c DB |
71 | }; |
72 | ||
73 | #define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \ | |
74 | DW_IC_CON_SLAVE_DISABLE | \ | |
75 | DW_IC_CON_RESTART_EN) | |
76 | ||
ceccd298 CCE |
77 | #define DW_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C | \ |
78 | I2C_FUNC_SMBUS_BYTE | \ | |
79 | I2C_FUNC_SMBUS_BYTE_DATA | \ | |
80 | I2C_FUNC_SMBUS_WORD_DATA | \ | |
81 | I2C_FUNC_SMBUS_I2C_BLOCK) | |
82 | ||
8efd1e9e CCE |
83 | /* BayTrail HCNT/LCNT/SDA hold time */ |
84 | static struct dw_scl_sda_cfg byt_config = { | |
85 | .ss_hcnt = 0x200, | |
86 | .fs_hcnt = 0x55, | |
87 | .ss_lcnt = 0x200, | |
88 | .fs_lcnt = 0x99, | |
89 | .sda_hold = 0x6, | |
90 | }; | |
91 | ||
157a801e MW |
92 | /* Haswell HCNT/LCNT/SDA hold time */ |
93 | static struct dw_scl_sda_cfg hsw_config = { | |
94 | .ss_hcnt = 0x01b0, | |
95 | .fs_hcnt = 0x48, | |
96 | .ss_lcnt = 0x01fb, | |
97 | .fs_lcnt = 0xa0, | |
98 | .sda_hold = 0x9, | |
99 | }; | |
100 | ||
a93ac578 | 101 | static struct dw_pci_controller dw_pci_controllers[] = { |
fe20ff5c DB |
102 | [medfield_0] = { |
103 | .bus_num = 0, | |
104 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, | |
105 | .tx_fifo_depth = 32, | |
106 | .rx_fifo_depth = 32, | |
107 | .clk_khz = 25000, | |
108 | }, | |
109 | [medfield_1] = { | |
110 | .bus_num = 1, | |
111 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, | |
112 | .tx_fifo_depth = 32, | |
113 | .rx_fifo_depth = 32, | |
114 | .clk_khz = 25000, | |
115 | }, | |
116 | [medfield_2] = { | |
117 | .bus_num = 2, | |
118 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, | |
119 | .tx_fifo_depth = 32, | |
120 | .rx_fifo_depth = 32, | |
121 | .clk_khz = 25000, | |
122 | }, | |
123 | [medfield_3] = { | |
124 | .bus_num = 3, | |
125 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD, | |
126 | .tx_fifo_depth = 32, | |
127 | .rx_fifo_depth = 32, | |
128 | .clk_khz = 25000, | |
129 | }, | |
130 | [medfield_4] = { | |
131 | .bus_num = 4, | |
132 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, | |
133 | .tx_fifo_depth = 32, | |
134 | .rx_fifo_depth = 32, | |
135 | .clk_khz = 25000, | |
136 | }, | |
137 | [medfield_5] = { | |
138 | .bus_num = 5, | |
139 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, | |
140 | .tx_fifo_depth = 32, | |
141 | .rx_fifo_depth = 32, | |
142 | .clk_khz = 25000, | |
143 | }, | |
089c729a MW |
144 | [baytrail] = { |
145 | .bus_num = -1, | |
146 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, | |
147 | .tx_fifo_depth = 32, | |
148 | .rx_fifo_depth = 32, | |
ceccd298 | 149 | .functionality = I2C_FUNC_10BIT_ADDR, |
8efd1e9e | 150 | .scl_sda_cfg = &byt_config, |
089c729a | 151 | }, |
157a801e MW |
152 | [haswell] = { |
153 | .bus_num = -1, | |
154 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, | |
155 | .tx_fifo_depth = 32, | |
156 | .rx_fifo_depth = 32, | |
157a801e MW |
157 | .functionality = I2C_FUNC_10BIT_ADDR, |
158 | .scl_sda_cfg = &hsw_config, | |
159 | }, | |
fe20ff5c | 160 | }; |
0409516a | 161 | |
be58eda7 | 162 | #ifdef CONFIG_PM |
52c28433 | 163 | static int i2c_dw_pci_suspend(struct device *dev) |
18dbdda8 | 164 | { |
238c44a7 | 165 | struct pci_dev *pdev = to_pci_dev(dev); |
18dbdda8 | 166 | |
be58eda7 | 167 | i2c_dw_disable(pci_get_drvdata(pdev)); |
18dbdda8 DB |
168 | return 0; |
169 | } | |
170 | ||
52c28433 | 171 | static int i2c_dw_pci_resume(struct device *dev) |
18dbdda8 | 172 | { |
238c44a7 | 173 | struct pci_dev *pdev = to_pci_dev(dev); |
18dbdda8 | 174 | |
be58eda7 | 175 | return i2c_dw_init(pci_get_drvdata(pdev)); |
18dbdda8 | 176 | } |
be58eda7 | 177 | #endif |
18dbdda8 | 178 | |
be58eda7 MW |
179 | static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend, |
180 | i2c_dw_pci_resume, NULL); | |
18dbdda8 | 181 | |
fe20ff5c DB |
182 | static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) |
183 | { | |
184 | return dev->controller->clk_khz; | |
185 | } | |
186 | ||
0b255e92 | 187 | static int i2c_dw_pci_probe(struct pci_dev *pdev, |
ca0c1ff5 | 188 | const struct pci_device_id *id) |
fe20ff5c DB |
189 | { |
190 | struct dw_i2c_dev *dev; | |
191 | struct i2c_adapter *adap; | |
fe20ff5c DB |
192 | int r; |
193 | struct dw_pci_controller *controller; | |
8efd1e9e | 194 | struct dw_scl_sda_cfg *cfg; |
fe20ff5c DB |
195 | |
196 | if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) { | |
ca0c1ff5 | 197 | dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__, |
fe20ff5c DB |
198 | id->driver_data); |
199 | return -EINVAL; | |
200 | } | |
201 | ||
202 | controller = &dw_pci_controllers[id->driver_data]; | |
203 | ||
76cf3fc8 | 204 | r = pcim_enable_device(pdev); |
fe20ff5c DB |
205 | if (r) { |
206 | dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n", | |
207 | r); | |
76cf3fc8 | 208 | return r; |
fe20ff5c DB |
209 | } |
210 | ||
76cf3fc8 | 211 | r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev)); |
fe20ff5c | 212 | if (r) { |
fe20ff5c | 213 | dev_err(&pdev->dev, "I/O memory remapping failed\n"); |
76cf3fc8 | 214 | return r; |
fe20ff5c DB |
215 | } |
216 | ||
76cf3fc8 AS |
217 | dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); |
218 | if (!dev) | |
219 | return -ENOMEM; | |
fe20ff5c | 220 | |
fe20ff5c DB |
221 | dev->clk = NULL; |
222 | dev->controller = controller; | |
223 | dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; | |
76cf3fc8 AS |
224 | dev->base = pcim_iomap_table(pdev)[0]; |
225 | dev->dev = &pdev->dev; | |
d80d1341 | 226 | dev->irq = pdev->irq; |
ceccd298 CCE |
227 | dev->functionality = controller->functionality | |
228 | DW_DEFAULT_FUNCTIONALITY; | |
229 | ||
a93ac578 | 230 | dev->master_cfg = controller->bus_cfg; |
8efd1e9e CCE |
231 | if (controller->scl_sda_cfg) { |
232 | cfg = controller->scl_sda_cfg; | |
233 | dev->ss_hcnt = cfg->ss_hcnt; | |
234 | dev->fs_hcnt = cfg->fs_hcnt; | |
235 | dev->ss_lcnt = cfg->ss_lcnt; | |
236 | dev->fs_lcnt = cfg->fs_lcnt; | |
237 | dev->sda_hold_time = cfg->sda_hold; | |
238 | } | |
fe20ff5c DB |
239 | |
240 | pci_set_drvdata(pdev, dev); | |
241 | ||
242 | dev->tx_fifo_depth = controller->tx_fifo_depth; | |
243 | dev->rx_fifo_depth = controller->rx_fifo_depth; | |
fe20ff5c DB |
244 | |
245 | adap = &dev->adapter; | |
fe20ff5c DB |
246 | adap->owner = THIS_MODULE; |
247 | adap->class = 0; | |
8eb5c87a | 248 | ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); |
fe20ff5c | 249 | adap->nr = controller->bus_num; |
089c729a | 250 | |
d80d1341 JN |
251 | r = i2c_dw_probe(dev); |
252 | if (r) | |
76cf3fc8 | 253 | return r; |
fe20ff5c | 254 | |
43452335 MW |
255 | pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); |
256 | pm_runtime_use_autosuspend(&pdev->dev); | |
be58eda7 | 257 | pm_runtime_put_autosuspend(&pdev->dev); |
18dbdda8 DB |
258 | pm_runtime_allow(&pdev->dev); |
259 | ||
fe20ff5c | 260 | return 0; |
fe20ff5c DB |
261 | } |
262 | ||
0b255e92 | 263 | static void i2c_dw_pci_remove(struct pci_dev *pdev) |
fe20ff5c DB |
264 | { |
265 | struct dw_i2c_dev *dev = pci_get_drvdata(pdev); | |
266 | ||
18dbdda8 DB |
267 | i2c_dw_disable(dev); |
268 | pm_runtime_forbid(&pdev->dev); | |
269 | pm_runtime_get_noresume(&pdev->dev); | |
270 | ||
fe20ff5c | 271 | i2c_del_adapter(&dev->adapter); |
fe20ff5c DB |
272 | } |
273 | ||
274 | /* work with hotplug and coldplug */ | |
275 | MODULE_ALIAS("i2c_designware-pci"); | |
276 | ||
392debf1 | 277 | static const struct pci_device_id i2_designware_pci_ids[] = { |
fe20ff5c | 278 | /* Medfield */ |
a93ac578 | 279 | { PCI_VDEVICE(INTEL, 0x0817), medfield_3 }, |
fe20ff5c DB |
280 | { PCI_VDEVICE(INTEL, 0x0818), medfield_4 }, |
281 | { PCI_VDEVICE(INTEL, 0x0819), medfield_5 }, | |
282 | { PCI_VDEVICE(INTEL, 0x082C), medfield_0 }, | |
283 | { PCI_VDEVICE(INTEL, 0x082D), medfield_1 }, | |
284 | { PCI_VDEVICE(INTEL, 0x082E), medfield_2 }, | |
089c729a MW |
285 | /* Baytrail */ |
286 | { PCI_VDEVICE(INTEL, 0x0F41), baytrail }, | |
287 | { PCI_VDEVICE(INTEL, 0x0F42), baytrail }, | |
288 | { PCI_VDEVICE(INTEL, 0x0F43), baytrail }, | |
289 | { PCI_VDEVICE(INTEL, 0x0F44), baytrail }, | |
290 | { PCI_VDEVICE(INTEL, 0x0F45), baytrail }, | |
291 | { PCI_VDEVICE(INTEL, 0x0F46), baytrail }, | |
292 | { PCI_VDEVICE(INTEL, 0x0F47), baytrail }, | |
157a801e MW |
293 | /* Haswell */ |
294 | { PCI_VDEVICE(INTEL, 0x9c61), haswell }, | |
295 | { PCI_VDEVICE(INTEL, 0x9c62), haswell }, | |
0409516a | 296 | /* Braswell / Cherrytrail */ |
a93ac578 | 297 | { PCI_VDEVICE(INTEL, 0x22C1), baytrail }, |
0409516a AC |
298 | { PCI_VDEVICE(INTEL, 0x22C2), baytrail }, |
299 | { PCI_VDEVICE(INTEL, 0x22C3), baytrail }, | |
300 | { PCI_VDEVICE(INTEL, 0x22C4), baytrail }, | |
301 | { PCI_VDEVICE(INTEL, 0x22C5), baytrail }, | |
302 | { PCI_VDEVICE(INTEL, 0x22C6), baytrail }, | |
303 | { PCI_VDEVICE(INTEL, 0x22C7), baytrail }, | |
fe20ff5c DB |
304 | { 0,} |
305 | }; | |
306 | MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids); | |
307 | ||
308 | static struct pci_driver dw_i2c_driver = { | |
309 | .name = DRIVER_NAME, | |
310 | .id_table = i2_designware_pci_ids, | |
311 | .probe = i2c_dw_pci_probe, | |
0b255e92 | 312 | .remove = i2c_dw_pci_remove, |
18dbdda8 DB |
313 | .driver = { |
314 | .pm = &i2c_dw_pm_ops, | |
315 | }, | |
fe20ff5c DB |
316 | }; |
317 | ||
56f21788 | 318 | module_pci_driver(dw_i2c_driver); |
fe20ff5c DB |
319 | |
320 | MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); | |
321 | MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter"); | |
322 | MODULE_LICENSE("GPL"); |