1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * shmob_drm_drv.c -- SH Mobile DRM driver
4 *
5 * Copyright (C) 2012 Renesas Electronics Corporation
6 *
7 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8 */
9
10 #include <linux/clk.h>
11 #include <linux/io.h>
12 #include <linux/mm.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/slab.h>
19
20 #include <drm/drm_atomic_helper.h>
21 #include <drm/drm_drv.h>
22 #include <drm/drm_fbdev_generic.h>
23 #include <drm/drm_gem_dma_helper.h>
24 #include <drm/drm_modeset_helper.h>
25 #include <drm/drm_module.h>
26 #include <drm/drm_probe_helper.h>
27 #include <drm/drm_vblank.h>
28
29 #include "shmob_drm_drv.h"
30 #include "shmob_drm_kms.h"
31 #include "shmob_drm_plane.h"
32 #include "shmob_drm_regs.h"
33
34 /* -----------------------------------------------------------------------------
35 * Hardware initialization
36 */
37
shmob_drm_setup_clocks(struct shmob_drm_device * sdev,enum shmob_drm_clk_source clksrc)38 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
39 enum shmob_drm_clk_source clksrc)
40 {
41 struct clk *clk;
42 char *clkname;
43
44 switch (clksrc) {
45 case SHMOB_DRM_CLK_BUS:
46 clkname = "fck";
47 sdev->lddckr = LDDCKR_ICKSEL_BUS;
48 break;
49 case SHMOB_DRM_CLK_PERIPHERAL:
50 clkname = "media";
51 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
52 break;
53 case SHMOB_DRM_CLK_EXTERNAL:
54 clkname = "lclk";
55 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
56 break;
57 default:
58 return -EINVAL;
59 }
60
61 clk = devm_clk_get(sdev->dev, clkname);
62 if (IS_ERR(clk)) {
63 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
64 return PTR_ERR(clk);
65 }
66
67 sdev->clock = clk;
68 return 0;
69 }
70
71 /* -----------------------------------------------------------------------------
72 * DRM operations
73 */
74
shmob_drm_irq(int irq,void * arg)75 static irqreturn_t shmob_drm_irq(int irq, void *arg)
76 {
77 struct drm_device *dev = arg;
78 struct shmob_drm_device *sdev = to_shmob_device(dev);
79 unsigned long flags;
80 u32 status;
81
82 /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
83 * bits in the same register is really brain-dead design and requires
84 * taking a spinlock.
85 */
86 spin_lock_irqsave(&sdev->irq_lock, flags);
87 status = lcdc_read(sdev, LDINTR);
88 lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
89 spin_unlock_irqrestore(&sdev->irq_lock, flags);
90
91 if (status & LDINTR_VES) {
92 drm_crtc_handle_vblank(&sdev->crtc.base);
93 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
94 }
95
96 return IRQ_HANDLED;
97 }
98
99 DEFINE_DRM_GEM_DMA_FOPS(shmob_drm_fops);
100
101 static const struct drm_driver shmob_drm_driver = {
102 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
103 DRM_GEM_DMA_DRIVER_OPS,
104 .fops = &shmob_drm_fops,
105 .name = "shmob-drm",
106 .desc = "Renesas SH Mobile DRM",
107 .date = "20120424",
108 .major = 1,
109 .minor = 0,
110 };
111
112 /* -----------------------------------------------------------------------------
113 * Power management
114 */
115
shmob_drm_pm_suspend(struct device * dev)116 static int shmob_drm_pm_suspend(struct device *dev)
117 {
118 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
119
120 return drm_mode_config_helper_suspend(&sdev->ddev);
121 }
122
shmob_drm_pm_resume(struct device * dev)123 static int shmob_drm_pm_resume(struct device *dev)
124 {
125 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
126
127 return drm_mode_config_helper_resume(&sdev->ddev);
128 }
129
shmob_drm_pm_runtime_suspend(struct device * dev)130 static int shmob_drm_pm_runtime_suspend(struct device *dev)
131 {
132 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
133
134 if (sdev->clock)
135 clk_disable_unprepare(sdev->clock);
136
137 return 0;
138 }
139
shmob_drm_pm_runtime_resume(struct device * dev)140 static int shmob_drm_pm_runtime_resume(struct device *dev)
141 {
142 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
143 int ret;
144
145 if (sdev->clock) {
146 ret = clk_prepare_enable(sdev->clock);
147 if (ret < 0)
148 return ret;
149 }
150
151 return 0;
152 }
153
154 static const struct dev_pm_ops shmob_drm_pm_ops = {
155 SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
156 RUNTIME_PM_OPS(shmob_drm_pm_runtime_suspend,
157 shmob_drm_pm_runtime_resume, NULL)
158 };
159
160 /* -----------------------------------------------------------------------------
161 * Platform driver
162 */
163
shmob_drm_remove(struct platform_device * pdev)164 static void shmob_drm_remove(struct platform_device *pdev)
165 {
166 struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
167 struct drm_device *ddev = &sdev->ddev;
168
169 drm_dev_unregister(ddev);
170 drm_atomic_helper_shutdown(ddev);
171 drm_kms_helper_poll_fini(ddev);
172 }
173
shmob_drm_probe(struct platform_device * pdev)174 static int shmob_drm_probe(struct platform_device *pdev)
175 {
176 struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
177 const struct shmob_drm_config *config;
178 struct shmob_drm_device *sdev;
179 struct drm_device *ddev;
180 int ret;
181
182 config = of_device_get_match_data(&pdev->dev);
183 if (!config && !pdata) {
184 dev_err(&pdev->dev, "no platform data\n");
185 return -EINVAL;
186 }
187
188 /*
189 * Allocate and initialize the DRM device, driver private data, I/O
190 * resources and clocks.
191 */
192 sdev = devm_drm_dev_alloc(&pdev->dev, &shmob_drm_driver,
193 struct shmob_drm_device, ddev);
194 if (IS_ERR(sdev))
195 return PTR_ERR(sdev);
196
197 ddev = &sdev->ddev;
198 sdev->dev = &pdev->dev;
199 if (config) {
200 sdev->config = *config;
201 } else {
202 sdev->pdata = pdata;
203 sdev->config.clk_source = pdata->clk_source;
204 sdev->config.clk_div = pdata->iface.clk_div;
205 }
206 spin_lock_init(&sdev->irq_lock);
207
208 platform_set_drvdata(pdev, sdev);
209
210 sdev->mmio = devm_platform_ioremap_resource(pdev, 0);
211 if (IS_ERR(sdev->mmio))
212 return PTR_ERR(sdev->mmio);
213
214 ret = shmob_drm_setup_clocks(sdev, sdev->config.clk_source);
215 if (ret < 0)
216 return ret;
217
218 ret = devm_pm_runtime_enable(&pdev->dev);
219 if (ret)
220 return ret;
221
222 ret = drm_vblank_init(ddev, 1);
223 if (ret < 0) {
224 dev_err(&pdev->dev, "failed to initialize vblank\n");
225 return ret;
226 }
227
228 ret = shmob_drm_modeset_init(sdev);
229 if (ret < 0)
230 return dev_err_probe(&pdev->dev, ret,
231 "failed to initialize mode setting\n");
232
233 ret = platform_get_irq(pdev, 0);
234 if (ret < 0)
235 goto err_modeset_cleanup;
236 sdev->irq = ret;
237
238 ret = devm_request_irq(&pdev->dev, sdev->irq, shmob_drm_irq, 0,
239 ddev->driver->name, ddev);
240 if (ret < 0) {
241 dev_err(&pdev->dev, "failed to install IRQ handler\n");
242 goto err_modeset_cleanup;
243 }
244
245 /*
246 * Register the DRM device with the core and the connectors with
247 * sysfs.
248 */
249 ret = drm_dev_register(ddev, 0);
250 if (ret < 0)
251 goto err_modeset_cleanup;
252
253 drm_fbdev_generic_setup(ddev, 16);
254
255 return 0;
256
257 err_modeset_cleanup:
258 drm_kms_helper_poll_fini(ddev);
259 return ret;
260 }
261
262 static const struct shmob_drm_config shmob_arm_config = {
263 .clk_source = SHMOB_DRM_CLK_BUS,
264 .clk_div = 5,
265 };
266
267 static const struct of_device_id shmob_drm_of_table[] __maybe_unused = {
268 { .compatible = "renesas,r8a7740-lcdc", .data = &shmob_arm_config, },
269 { .compatible = "renesas,sh73a0-lcdc", .data = &shmob_arm_config, },
270 { /* sentinel */ }
271 };
272
273 static struct platform_driver shmob_drm_platform_driver = {
274 .probe = shmob_drm_probe,
275 .remove_new = shmob_drm_remove,
276 .driver = {
277 .name = "shmob-drm",
278 .of_match_table = of_match_ptr(shmob_drm_of_table),
279 .pm = &shmob_drm_pm_ops,
280 },
281 };
282
283 drm_module_platform_driver(shmob_drm_platform_driver);
284
285 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
286 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
287 MODULE_LICENSE("GPL");
288