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23#include <linux/clk.h>
24#include <linux/delay.h>
25#include <linux/host1x.h>
26#include <linux/io.h>
27#include <linux/of_platform.h>
28#include <linux/platform_device.h>
29#include <linux/slab.h>
30
31#include "dev.h"
32
33#define MIPI_CAL_CTRL 0x00
34#define MIPI_CAL_CTRL_START (1 << 0)
35
36#define MIPI_CAL_AUTOCAL_CTRL 0x01
37
38#define MIPI_CAL_STATUS 0x02
39#define MIPI_CAL_STATUS_DONE (1 << 16)
40#define MIPI_CAL_STATUS_ACTIVE (1 << 0)
41
42#define MIPI_CAL_CONFIG_CSIA 0x05
43#define MIPI_CAL_CONFIG_CSIB 0x06
44#define MIPI_CAL_CONFIG_CSIC 0x07
45#define MIPI_CAL_CONFIG_CSID 0x08
46#define MIPI_CAL_CONFIG_CSIE 0x09
47#define MIPI_CAL_CONFIG_DSIA 0x0e
48#define MIPI_CAL_CONFIG_DSIB 0x0f
49#define MIPI_CAL_CONFIG_DSIC 0x10
50#define MIPI_CAL_CONFIG_DSID 0x11
51
52#define MIPI_CAL_CONFIG_DSIAB_CLK 0x19
53#define MIPI_CAL_CONFIG_DSICD_CLK 0x1a
54#define MIPI_CAL_CONFIG_CSIAB_CLK 0x1b
55#define MIPI_CAL_CONFIG_CSICD_CLK 0x1c
56#define MIPI_CAL_CONFIG_CSIE_CLK 0x1d
57
58
59#define MIPI_CAL_CONFIG_SELECT (1 << 21)
60
61
62#define MIPI_CAL_CONFIG_HSPDOS(x) (((x) & 0x1f) << 16)
63#define MIPI_CAL_CONFIG_HSPUOS(x) (((x) & 0x1f) << 8)
64#define MIPI_CAL_CONFIG_TERMOS(x) (((x) & 0x1f) << 0)
65
66
67#define MIPI_CAL_CONFIG_HSCLKPDOSD(x) (((x) & 0x1f) << 8)
68#define MIPI_CAL_CONFIG_HSCLKPUOSD(x) (((x) & 0x1f) << 0)
69
70#define MIPI_CAL_BIAS_PAD_CFG0 0x16
71#define MIPI_CAL_BIAS_PAD_PDVCLAMP (1 << 1)
72#define MIPI_CAL_BIAS_PAD_E_VCLAMP_REF (1 << 0)
73
74#define MIPI_CAL_BIAS_PAD_CFG1 0x17
75#define MIPI_CAL_BIAS_PAD_DRV_DN_REF(x) (((x) & 0x7) << 16)
76
77#define MIPI_CAL_BIAS_PAD_CFG2 0x18
78#define MIPI_CAL_BIAS_PAD_PDVREG (1 << 1)
79
80struct tegra_mipi_pad {
81 unsigned long data;
82 unsigned long clk;
83};
84
85struct tegra_mipi_soc {
86 bool has_clk_lane;
87 const struct tegra_mipi_pad *pads;
88 unsigned int num_pads;
89};
90
91struct tegra_mipi {
92 const struct tegra_mipi_soc *soc;
93 void __iomem *regs;
94 struct mutex lock;
95 struct clk *clk;
96};
97
98struct tegra_mipi_device {
99 struct platform_device *pdev;
100 struct tegra_mipi *mipi;
101 struct device *device;
102 unsigned long pads;
103};
104
105static inline u32 tegra_mipi_readl(struct tegra_mipi *mipi,
106 unsigned long offset)
107{
108 return readl(mipi->regs + (offset << 2));
109}
110
111static inline void tegra_mipi_writel(struct tegra_mipi *mipi, u32 value,
112 unsigned long offset)
113{
114 writel(value, mipi->regs + (offset << 2));
115}
116
117struct tegra_mipi_device *tegra_mipi_request(struct device *device)
118{
119 struct device_node *np = device->of_node;
120 struct tegra_mipi_device *dev;
121 struct of_phandle_args args;
122 int err;
123
124 err = of_parse_phandle_with_args(np, "nvidia,mipi-calibrate",
125 "#nvidia,mipi-calibrate-cells", 0,
126 &args);
127 if (err < 0)
128 return ERR_PTR(err);
129
130 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
131 if (!dev) {
132 err = -ENOMEM;
133 goto out;
134 }
135
136 dev->pdev = of_find_device_by_node(args.np);
137 if (!dev->pdev) {
138 err = -ENODEV;
139 goto free;
140 }
141
142 dev->mipi = platform_get_drvdata(dev->pdev);
143 if (!dev->mipi) {
144 err = -EPROBE_DEFER;
145 goto put;
146 }
147
148 of_node_put(args.np);
149
150 dev->pads = args.args[0];
151 dev->device = device;
152
153 return dev;
154
155put:
156 platform_device_put(dev->pdev);
157free:
158 kfree(dev);
159out:
160 of_node_put(args.np);
161 return ERR_PTR(err);
162}
163EXPORT_SYMBOL(tegra_mipi_request);
164
165void tegra_mipi_free(struct tegra_mipi_device *device)
166{
167 platform_device_put(device->pdev);
168 kfree(device);
169}
170EXPORT_SYMBOL(tegra_mipi_free);
171
172static int tegra_mipi_wait(struct tegra_mipi *mipi)
173{
174 unsigned long timeout = jiffies + msecs_to_jiffies(250);
175 u32 value;
176
177 while (time_before(jiffies, timeout)) {
178 value = tegra_mipi_readl(mipi, MIPI_CAL_STATUS);
179 if ((value & MIPI_CAL_STATUS_ACTIVE) == 0 &&
180 (value & MIPI_CAL_STATUS_DONE) != 0)
181 return 0;
182
183 usleep_range(10, 50);
184 }
185
186 return -ETIMEDOUT;
187}
188
189int tegra_mipi_calibrate(struct tegra_mipi_device *device)
190{
191 const struct tegra_mipi_soc *soc = device->mipi->soc;
192 unsigned int i;
193 u32 value;
194 int err;
195
196 err = clk_enable(device->mipi->clk);
197 if (err < 0)
198 return err;
199
200 mutex_lock(&device->mipi->lock);
201
202 value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG0);
203 value &= ~MIPI_CAL_BIAS_PAD_PDVCLAMP;
204 value |= MIPI_CAL_BIAS_PAD_E_VCLAMP_REF;
205 tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG0);
206
207 tegra_mipi_writel(device->mipi, MIPI_CAL_BIAS_PAD_DRV_DN_REF(2),
208 MIPI_CAL_BIAS_PAD_CFG1);
209
210 value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG2);
211 value &= ~MIPI_CAL_BIAS_PAD_PDVREG;
212 tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
213
214 for (i = 0; i < soc->num_pads; i++) {
215 u32 clk = 0, data = 0;
216
217 if (device->pads & BIT(i)) {
218 data = MIPI_CAL_CONFIG_SELECT |
219 MIPI_CAL_CONFIG_HSPDOS(0) |
220 MIPI_CAL_CONFIG_HSPUOS(4) |
221 MIPI_CAL_CONFIG_TERMOS(5);
222 clk = MIPI_CAL_CONFIG_SELECT |
223 MIPI_CAL_CONFIG_HSCLKPDOSD(0) |
224 MIPI_CAL_CONFIG_HSCLKPUOSD(4);
225 }
226
227 tegra_mipi_writel(device->mipi, data, soc->pads[i].data);
228
229 if (soc->has_clk_lane)
230 tegra_mipi_writel(device->mipi, clk, soc->pads[i].clk);
231 }
232
233 value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL);
234 value |= MIPI_CAL_CTRL_START;
235 tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL);
236
237 err = tegra_mipi_wait(device->mipi);
238
239 mutex_unlock(&device->mipi->lock);
240 clk_disable(device->mipi->clk);
241
242 return err;
243}
244EXPORT_SYMBOL(tegra_mipi_calibrate);
245
246static const struct tegra_mipi_pad tegra114_mipi_pads[] = {
247 { .data = MIPI_CAL_CONFIG_CSIA },
248 { .data = MIPI_CAL_CONFIG_CSIB },
249 { .data = MIPI_CAL_CONFIG_CSIC },
250 { .data = MIPI_CAL_CONFIG_CSID },
251 { .data = MIPI_CAL_CONFIG_CSIE },
252 { .data = MIPI_CAL_CONFIG_DSIA },
253 { .data = MIPI_CAL_CONFIG_DSIB },
254 { .data = MIPI_CAL_CONFIG_DSIC },
255 { .data = MIPI_CAL_CONFIG_DSID },
256};
257
258static const struct tegra_mipi_soc tegra114_mipi_soc = {
259 .has_clk_lane = false,
260 .pads = tegra114_mipi_pads,
261 .num_pads = ARRAY_SIZE(tegra114_mipi_pads),
262};
263
264static const struct tegra_mipi_pad tegra124_mipi_pads[] = {
265 { .data = MIPI_CAL_CONFIG_CSIA, .clk = MIPI_CAL_CONFIG_CSIAB_CLK },
266 { .data = MIPI_CAL_CONFIG_CSIB, .clk = MIPI_CAL_CONFIG_CSIAB_CLK },
267 { .data = MIPI_CAL_CONFIG_CSIC, .clk = MIPI_CAL_CONFIG_CSICD_CLK },
268 { .data = MIPI_CAL_CONFIG_CSID, .clk = MIPI_CAL_CONFIG_CSICD_CLK },
269 { .data = MIPI_CAL_CONFIG_CSIE, .clk = MIPI_CAL_CONFIG_CSIE_CLK },
270 { .data = MIPI_CAL_CONFIG_DSIA, .clk = MIPI_CAL_CONFIG_DSIAB_CLK },
271 { .data = MIPI_CAL_CONFIG_DSIB, .clk = MIPI_CAL_CONFIG_DSIAB_CLK },
272};
273
274static const struct tegra_mipi_soc tegra124_mipi_soc = {
275 .has_clk_lane = true,
276 .pads = tegra124_mipi_pads,
277 .num_pads = ARRAY_SIZE(tegra124_mipi_pads),
278};
279
280static struct of_device_id tegra_mipi_of_match[] = {
281 { .compatible = "nvidia,tegra114-mipi", .data = &tegra114_mipi_soc },
282 { .compatible = "nvidia,tegra124-mipi", .data = &tegra124_mipi_soc },
283 { },
284};
285
286static int tegra_mipi_probe(struct platform_device *pdev)
287{
288 const struct of_device_id *match;
289 struct tegra_mipi *mipi;
290 struct resource *res;
291 int err;
292
293 match = of_match_node(tegra_mipi_of_match, pdev->dev.of_node);
294 if (!match)
295 return -ENODEV;
296
297 mipi = devm_kzalloc(&pdev->dev, sizeof(*mipi), GFP_KERNEL);
298 if (!mipi)
299 return -ENOMEM;
300
301 mipi->soc = match->data;
302
303 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
304 mipi->regs = devm_ioremap_resource(&pdev->dev, res);
305 if (IS_ERR(mipi->regs))
306 return PTR_ERR(mipi->regs);
307
308 mutex_init(&mipi->lock);
309
310 mipi->clk = devm_clk_get(&pdev->dev, NULL);
311 if (IS_ERR(mipi->clk)) {
312 dev_err(&pdev->dev, "failed to get clock\n");
313 return PTR_ERR(mipi->clk);
314 }
315
316 err = clk_prepare(mipi->clk);
317 if (err < 0)
318 return err;
319
320 platform_set_drvdata(pdev, mipi);
321
322 return 0;
323}
324
325static int tegra_mipi_remove(struct platform_device *pdev)
326{
327 struct tegra_mipi *mipi = platform_get_drvdata(pdev);
328
329 clk_unprepare(mipi->clk);
330
331 return 0;
332}
333
334struct platform_driver tegra_mipi_driver = {
335 .driver = {
336 .name = "tegra-mipi",
337 .of_match_table = tegra_mipi_of_match,
338 },
339 .probe = tegra_mipi_probe,
340 .remove = tegra_mipi_remove,
341};
342
