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/platform_device.h>
15 #include <linux/pm.h>
16 #include <linux/slab.h>
17
18 #include <drm/drm_crtc_helper.h>
19 #include <drm/drm_drv.h>
20 #include <drm/drm_gem_cma_helper.h>
21 #include <drm/drm_irq.h>
22 #include <drm/drm_probe_helper.h>
23 #include <drm/drm_vblank.h>
24
25 #include "shmob_drm_drv.h"
26 #include "shmob_drm_kms.h"
27 #include "shmob_drm_plane.h"
28 #include "shmob_drm_regs.h"
29
30 /* -----------------------------------------------------------------------------
31 * Hardware initialization
32 */
33
shmob_drm_init_interface(struct shmob_drm_device * sdev)34 static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
35 {
36 static const u32 ldmt1r[] = {
37 [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
38 [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
39 [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
40 [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
41 [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
42 [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
43 [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
44 [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
45 [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
46 [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
47 [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
48 [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
49 [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
50 [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
51 [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
52 [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
53 [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
54 [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
55 [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
56 };
57
58 if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
59 dev_err(sdev->dev, "invalid interface type %u\n",
60 sdev->pdata->iface.interface);
61 return -EINVAL;
62 }
63
64 sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
65 return 0;
66 }
67
shmob_drm_setup_clocks(struct shmob_drm_device * sdev,enum shmob_drm_clk_source clksrc)68 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
69 enum shmob_drm_clk_source clksrc)
70 {
71 struct clk *clk;
72 char *clkname;
73
74 switch (clksrc) {
75 case SHMOB_DRM_CLK_BUS:
76 clkname = "bus_clk";
77 sdev->lddckr = LDDCKR_ICKSEL_BUS;
78 break;
79 case SHMOB_DRM_CLK_PERIPHERAL:
80 clkname = "peripheral_clk";
81 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
82 break;
83 case SHMOB_DRM_CLK_EXTERNAL:
84 clkname = NULL;
85 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
86 break;
87 default:
88 return -EINVAL;
89 }
90
91 clk = devm_clk_get(sdev->dev, clkname);
92 if (IS_ERR(clk)) {
93 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
94 return PTR_ERR(clk);
95 }
96
97 sdev->clock = clk;
98 return 0;
99 }
100
101 /* -----------------------------------------------------------------------------
102 * DRM operations
103 */
104
shmob_drm_irq(int irq,void * arg)105 static irqreturn_t shmob_drm_irq(int irq, void *arg)
106 {
107 struct drm_device *dev = arg;
108 struct shmob_drm_device *sdev = dev->dev_private;
109 unsigned long flags;
110 u32 status;
111
112 /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
113 * bits in the same register is really brain-dead design and requires
114 * taking a spinlock.
115 */
116 spin_lock_irqsave(&sdev->irq_lock, flags);
117 status = lcdc_read(sdev, LDINTR);
118 lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
119 spin_unlock_irqrestore(&sdev->irq_lock, flags);
120
121 if (status & LDINTR_VES) {
122 drm_handle_vblank(dev, 0);
123 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
124 }
125
126 return IRQ_HANDLED;
127 }
128
129 DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops);
130
131 static struct drm_driver shmob_drm_driver = {
132 .driver_features = DRIVER_GEM | DRIVER_MODESET,
133 .irq_handler = shmob_drm_irq,
134 DRM_GEM_CMA_DRIVER_OPS,
135 .fops = &shmob_drm_fops,
136 .name = "shmob-drm",
137 .desc = "Renesas SH Mobile DRM",
138 .date = "20120424",
139 .major = 1,
140 .minor = 0,
141 };
142
143 /* -----------------------------------------------------------------------------
144 * Power management
145 */
146
147 #ifdef CONFIG_PM_SLEEP
shmob_drm_pm_suspend(struct device * dev)148 static int shmob_drm_pm_suspend(struct device *dev)
149 {
150 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
151
152 drm_kms_helper_poll_disable(sdev->ddev);
153 shmob_drm_crtc_suspend(&sdev->crtc);
154
155 return 0;
156 }
157
shmob_drm_pm_resume(struct device * dev)158 static int shmob_drm_pm_resume(struct device *dev)
159 {
160 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
161
162 drm_modeset_lock_all(sdev->ddev);
163 shmob_drm_crtc_resume(&sdev->crtc);
164 drm_modeset_unlock_all(sdev->ddev);
165
166 drm_kms_helper_poll_enable(sdev->ddev);
167 return 0;
168 }
169 #endif
170
171 static const struct dev_pm_ops shmob_drm_pm_ops = {
172 SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
173 };
174
175 /* -----------------------------------------------------------------------------
176 * Platform driver
177 */
178
shmob_drm_remove(struct platform_device * pdev)179 static int shmob_drm_remove(struct platform_device *pdev)
180 {
181 struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
182 struct drm_device *ddev = sdev->ddev;
183
184 drm_dev_unregister(ddev);
185 drm_kms_helper_poll_fini(ddev);
186 drm_irq_uninstall(ddev);
187 drm_dev_put(ddev);
188
189 return 0;
190 }
191
shmob_drm_probe(struct platform_device * pdev)192 static int shmob_drm_probe(struct platform_device *pdev)
193 {
194 struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
195 struct shmob_drm_device *sdev;
196 struct drm_device *ddev;
197 struct resource *res;
198 unsigned int i;
199 int ret;
200
201 if (pdata == NULL) {
202 dev_err(&pdev->dev, "no platform data\n");
203 return -EINVAL;
204 }
205
206 /*
207 * Allocate and initialize the driver private data, I/O resources and
208 * clocks.
209 */
210 sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
211 if (sdev == NULL)
212 return -ENOMEM;
213
214 sdev->dev = &pdev->dev;
215 sdev->pdata = pdata;
216 spin_lock_init(&sdev->irq_lock);
217
218 platform_set_drvdata(pdev, sdev);
219
220 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
221 sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
222 if (IS_ERR(sdev->mmio))
223 return PTR_ERR(sdev->mmio);
224
225 ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
226 if (ret < 0)
227 return ret;
228
229 ret = shmob_drm_init_interface(sdev);
230 if (ret < 0)
231 return ret;
232
233 /* Allocate and initialize the DRM device. */
234 ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev);
235 if (IS_ERR(ddev))
236 return PTR_ERR(ddev);
237
238 sdev->ddev = ddev;
239 ddev->dev_private = sdev;
240
241 ret = shmob_drm_modeset_init(sdev);
242 if (ret < 0) {
243 dev_err(&pdev->dev, "failed to initialize mode setting\n");
244 goto err_free_drm_dev;
245 }
246
247 for (i = 0; i < 4; ++i) {
248 ret = shmob_drm_plane_create(sdev, i);
249 if (ret < 0) {
250 dev_err(&pdev->dev, "failed to create plane %u\n", i);
251 goto err_modeset_cleanup;
252 }
253 }
254
255 ret = drm_vblank_init(ddev, 1);
256 if (ret < 0) {
257 dev_err(&pdev->dev, "failed to initialize vblank\n");
258 goto err_modeset_cleanup;
259 }
260
261 ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
262 if (ret < 0) {
263 dev_err(&pdev->dev, "failed to install IRQ handler\n");
264 goto err_modeset_cleanup;
265 }
266
267 /*
268 * Register the DRM device with the core and the connectors with
269 * sysfs.
270 */
271 ret = drm_dev_register(ddev, 0);
272 if (ret < 0)
273 goto err_irq_uninstall;
274
275 return 0;
276
277 err_irq_uninstall:
278 drm_irq_uninstall(ddev);
279 err_modeset_cleanup:
280 drm_kms_helper_poll_fini(ddev);
281 err_free_drm_dev:
282 drm_dev_put(ddev);
283
284 return ret;
285 }
286
287 static struct platform_driver shmob_drm_platform_driver = {
288 .probe = shmob_drm_probe,
289 .remove = shmob_drm_remove,
290 .driver = {
291 .name = "shmob-drm",
292 .pm = &shmob_drm_pm_ops,
293 },
294 };
295
296 module_platform_driver(shmob_drm_platform_driver);
297
298 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
299 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
300 MODULE_LICENSE("GPL");
301