2 * Copyright (C) 2013 NVIDIA Corporation
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 #include <linux/clk.h>
24 #include <linux/delay.h>
25 #include <linux/host1x.h>
27 #include <linux/of_platform.h>
28 #include <linux/platform_device.h>
29 #include <linux/slab.h>
33 #define MIPI_CAL_CTRL 0x00
34 #define MIPI_CAL_CTRL_START (1 << 0)
36 #define MIPI_CAL_AUTOCAL_CTRL 0x01
38 #define MIPI_CAL_STATUS 0x02
39 #define MIPI_CAL_STATUS_DONE (1 << 16)
40 #define MIPI_CAL_STATUS_ACTIVE (1 << 0)
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
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
58 /* for data and clock lanes */
59 #define MIPI_CAL_CONFIG_SELECT (1 << 21)
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)
67 #define MIPI_CAL_CONFIG_HSCLKPDOSD(x) (((x) & 0x1f) << 8)
68 #define MIPI_CAL_CONFIG_HSCLKPUOSD(x) (((x) & 0x1f) << 0)
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)
74 #define MIPI_CAL_BIAS_PAD_CFG1 0x17
75 #define MIPI_CAL_BIAS_PAD_DRV_DN_REF(x) (((x) & 0x7) << 16)
77 #define MIPI_CAL_BIAS_PAD_CFG2 0x18
78 #define MIPI_CAL_BIAS_PAD_PDVREG (1 << 1)
80 struct tegra_mipi_pad {
85 struct tegra_mipi_soc {
87 const struct tegra_mipi_pad *pads;
88 unsigned int num_pads;
92 const struct tegra_mipi_soc *soc;
98 struct tegra_mipi_device {
99 struct platform_device *pdev;
100 struct tegra_mipi *mipi;
101 struct device *device;
105 static inline u32 tegra_mipi_readl(struct tegra_mipi *mipi,
106 unsigned long offset)
108 return readl(mipi->regs + (offset << 2));
111 static inline void tegra_mipi_writel(struct tegra_mipi *mipi, u32 value,
112 unsigned long offset)
114 writel(value, mipi->regs + (offset << 2));
117 struct tegra_mipi_device *tegra_mipi_request(struct device *device)
119 struct device_node *np = device->of_node;
120 struct tegra_mipi_device *dev;
121 struct of_phandle_args args;
124 err = of_parse_phandle_with_args(np, "nvidia,mipi-calibrate",
125 "#nvidia,mipi-calibrate-cells", 0,
130 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
136 dev->pdev = of_find_device_by_node(args.np);
142 dev->mipi = platform_get_drvdata(dev->pdev);
148 of_node_put(args.np);
150 dev->pads = args.args[0];
151 dev->device = device;
156 platform_device_put(dev->pdev);
160 of_node_put(args.np);
163 EXPORT_SYMBOL(tegra_mipi_request);
165 void tegra_mipi_free(struct tegra_mipi_device *device)
167 platform_device_put(device->pdev);
170 EXPORT_SYMBOL(tegra_mipi_free);
172 static int tegra_mipi_wait(struct tegra_mipi *mipi)
174 unsigned long timeout = jiffies + msecs_to_jiffies(250);
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)
183 usleep_range(10, 50);
189 int tegra_mipi_calibrate(struct tegra_mipi_device *device)
191 const struct tegra_mipi_soc *soc = device->mipi->soc;
196 err = clk_enable(device->mipi->clk);
200 mutex_lock(&device->mipi->lock);
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);
207 tegra_mipi_writel(device->mipi, MIPI_CAL_BIAS_PAD_DRV_DN_REF(2),
208 MIPI_CAL_BIAS_PAD_CFG1);
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);
214 for (i = 0; i < soc->num_pads; i++) {
215 u32 clk = 0, data = 0;
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);
227 tegra_mipi_writel(device->mipi, data, soc->pads[i].data);
229 if (soc->has_clk_lane)
230 tegra_mipi_writel(device->mipi, clk, soc->pads[i].clk);
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);
237 err = tegra_mipi_wait(device->mipi);
239 mutex_unlock(&device->mipi->lock);
240 clk_disable(device->mipi->clk);
244 EXPORT_SYMBOL(tegra_mipi_calibrate);
246 static 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 },
258 static 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),
264 static 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 },
274 static 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),
280 static 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 },
286 static int tegra_mipi_probe(struct platform_device *pdev)
288 const struct of_device_id *match;
289 struct tegra_mipi *mipi;
290 struct resource *res;
293 match = of_match_node(tegra_mipi_of_match, pdev->dev.of_node);
297 mipi = devm_kzalloc(&pdev->dev, sizeof(*mipi), GFP_KERNEL);
301 mipi->soc = match->data;
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);
308 mutex_init(&mipi->lock);
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);
316 err = clk_prepare(mipi->clk);
320 platform_set_drvdata(pdev, mipi);
325 static int tegra_mipi_remove(struct platform_device *pdev)
327 struct tegra_mipi *mipi = platform_get_drvdata(pdev);
329 clk_unprepare(mipi->clk);
334 struct platform_driver tegra_mipi_driver = {
336 .name = "tegra-mipi",
337 .of_match_table = tegra_mipi_of_match,
339 .probe = tegra_mipi_probe,
340 .remove = tegra_mipi_remove,