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 .gem_free_object_unlocked = drm_gem_cma_free_object,
135 .gem_vm_ops = &drm_gem_cma_vm_ops,
136 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
137 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
138 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
139 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
140 .gem_prime_vmap = drm_gem_cma_prime_vmap,
141 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
142 .gem_prime_mmap = drm_gem_cma_prime_mmap,
143 .dumb_create = drm_gem_cma_dumb_create,
144 .fops = &shmob_drm_fops,
145 .name = "shmob-drm",
146 .desc = "Renesas SH Mobile DRM",
147 .date = "20120424",
148 .major = 1,
149 .minor = 0,
150 };
151
152 /* -----------------------------------------------------------------------------
153 * Power management
154 */
155
156 #ifdef CONFIG_PM_SLEEP
shmob_drm_pm_suspend(struct device * dev)157 static int shmob_drm_pm_suspend(struct device *dev)
158 {
159 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
160
161 drm_kms_helper_poll_disable(sdev->ddev);
162 shmob_drm_crtc_suspend(&sdev->crtc);
163
164 return 0;
165 }
166
shmob_drm_pm_resume(struct device * dev)167 static int shmob_drm_pm_resume(struct device *dev)
168 {
169 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
170
171 drm_modeset_lock_all(sdev->ddev);
172 shmob_drm_crtc_resume(&sdev->crtc);
173 drm_modeset_unlock_all(sdev->ddev);
174
175 drm_kms_helper_poll_enable(sdev->ddev);
176 return 0;
177 }
178 #endif
179
180 static const struct dev_pm_ops shmob_drm_pm_ops = {
181 SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
182 };
183
184 /* -----------------------------------------------------------------------------
185 * Platform driver
186 */
187
shmob_drm_remove(struct platform_device * pdev)188 static int shmob_drm_remove(struct platform_device *pdev)
189 {
190 struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
191 struct drm_device *ddev = sdev->ddev;
192
193 drm_dev_unregister(ddev);
194 drm_kms_helper_poll_fini(ddev);
195 drm_mode_config_cleanup(ddev);
196 drm_irq_uninstall(ddev);
197 drm_dev_put(ddev);
198
199 return 0;
200 }
201
shmob_drm_probe(struct platform_device * pdev)202 static int shmob_drm_probe(struct platform_device *pdev)
203 {
204 struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
205 struct shmob_drm_device *sdev;
206 struct drm_device *ddev;
207 struct resource *res;
208 unsigned int i;
209 int ret;
210
211 if (pdata == NULL) {
212 dev_err(&pdev->dev, "no platform data\n");
213 return -EINVAL;
214 }
215
216 /*
217 * Allocate and initialize the driver private data, I/O resources and
218 * clocks.
219 */
220 sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
221 if (sdev == NULL)
222 return -ENOMEM;
223
224 sdev->dev = &pdev->dev;
225 sdev->pdata = pdata;
226 spin_lock_init(&sdev->irq_lock);
227
228 platform_set_drvdata(pdev, sdev);
229
230 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
231 sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
232 if (IS_ERR(sdev->mmio))
233 return PTR_ERR(sdev->mmio);
234
235 ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
236 if (ret < 0)
237 return ret;
238
239 ret = shmob_drm_init_interface(sdev);
240 if (ret < 0)
241 return ret;
242
243 /* Allocate and initialize the DRM device. */
244 ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev);
245 if (IS_ERR(ddev))
246 return PTR_ERR(ddev);
247
248 sdev->ddev = ddev;
249 ddev->dev_private = sdev;
250
251 ret = shmob_drm_modeset_init(sdev);
252 if (ret < 0) {
253 dev_err(&pdev->dev, "failed to initialize mode setting\n");
254 goto err_free_drm_dev;
255 }
256
257 for (i = 0; i < 4; ++i) {
258 ret = shmob_drm_plane_create(sdev, i);
259 if (ret < 0) {
260 dev_err(&pdev->dev, "failed to create plane %u\n", i);
261 goto err_modeset_cleanup;
262 }
263 }
264
265 ret = drm_vblank_init(ddev, 1);
266 if (ret < 0) {
267 dev_err(&pdev->dev, "failed to initialize vblank\n");
268 goto err_modeset_cleanup;
269 }
270
271 ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
272 if (ret < 0) {
273 dev_err(&pdev->dev, "failed to install IRQ handler\n");
274 goto err_modeset_cleanup;
275 }
276
277 /*
278 * Register the DRM device with the core and the connectors with
279 * sysfs.
280 */
281 ret = drm_dev_register(ddev, 0);
282 if (ret < 0)
283 goto err_irq_uninstall;
284
285 return 0;
286
287 err_irq_uninstall:
288 drm_irq_uninstall(ddev);
289 err_modeset_cleanup:
290 drm_kms_helper_poll_fini(ddev);
291 drm_mode_config_cleanup(ddev);
292 err_free_drm_dev:
293 drm_dev_put(ddev);
294
295 return ret;
296 }
297
298 static struct platform_driver shmob_drm_platform_driver = {
299 .probe = shmob_drm_probe,
300 .remove = shmob_drm_remove,
301 .driver = {
302 .name = "shmob-drm",
303 .pm = &shmob_drm_pm_ops,
304 },
305 };
306
307 module_platform_driver(shmob_drm_platform_driver);
308
309 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
310 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
311 MODULE_LICENSE("GPL");
312
