1 /*
2 * shmob_drm_drv.c -- SH Mobile DRM driver
3 *
4 * Copyright (C) 2012 Renesas Electronics Corporation
5 *
6 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/io.h>
16 #include <linux/mm.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/pm.h>
20 #include <linux/slab.h>
21
22 #include <drm/drmP.h>
23 #include <drm/drm_crtc_helper.h>
24 #include <drm/drm_gem_cma_helper.h>
25
26 #include "shmob_drm_drv.h"
27 #include "shmob_drm_kms.h"
28 #include "shmob_drm_plane.h"
29 #include "shmob_drm_regs.h"
30
31 /* -----------------------------------------------------------------------------
32 * Hardware initialization
33 */
34
shmob_drm_init_interface(struct shmob_drm_device * sdev)35 static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
36 {
37 static const u32 ldmt1r[] = {
38 [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
39 [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
40 [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
41 [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
42 [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
43 [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
44 [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
45 [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
46 [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
47 [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
48 [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
49 [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
50 [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
51 [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
52 [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
53 [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
54 [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
55 [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
56 [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
57 };
58
59 if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
60 dev_err(sdev->dev, "invalid interface type %u\n",
61 sdev->pdata->iface.interface);
62 return -EINVAL;
63 }
64
65 sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
66 return 0;
67 }
68
shmob_drm_setup_clocks(struct shmob_drm_device * sdev,enum shmob_drm_clk_source clksrc)69 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
70 enum shmob_drm_clk_source clksrc)
71 {
72 struct clk *clk;
73 char *clkname;
74
75 switch (clksrc) {
76 case SHMOB_DRM_CLK_BUS:
77 clkname = "bus_clk";
78 sdev->lddckr = LDDCKR_ICKSEL_BUS;
79 break;
80 case SHMOB_DRM_CLK_PERIPHERAL:
81 clkname = "peripheral_clk";
82 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
83 break;
84 case SHMOB_DRM_CLK_EXTERNAL:
85 clkname = NULL;
86 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
87 break;
88 default:
89 return -EINVAL;
90 }
91
92 clk = devm_clk_get(sdev->dev, clkname);
93 if (IS_ERR(clk)) {
94 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
95 return PTR_ERR(clk);
96 }
97
98 sdev->clock = clk;
99 return 0;
100 }
101
102 /* -----------------------------------------------------------------------------
103 * DRM operations
104 */
105
shmob_drm_irq(int irq,void * arg)106 static irqreturn_t shmob_drm_irq(int irq, void *arg)
107 {
108 struct drm_device *dev = arg;
109 struct shmob_drm_device *sdev = dev->dev_private;
110 unsigned long flags;
111 u32 status;
112
113 /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
114 * bits in the same register is really brain-dead design and requires
115 * taking a spinlock.
116 */
117 spin_lock_irqsave(&sdev->irq_lock, flags);
118 status = lcdc_read(sdev, LDINTR);
119 lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
120 spin_unlock_irqrestore(&sdev->irq_lock, flags);
121
122 if (status & LDINTR_VES) {
123 drm_handle_vblank(dev, 0);
124 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
125 }
126
127 return IRQ_HANDLED;
128 }
129
130 DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops);
131
132 static struct drm_driver shmob_drm_driver = {
133 .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
134 | DRIVER_PRIME,
135 .irq_handler = shmob_drm_irq,
136 .gem_free_object_unlocked = drm_gem_cma_free_object,
137 .gem_vm_ops = &drm_gem_cma_vm_ops,
138 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
139 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
140 .gem_prime_import = drm_gem_prime_import,
141 .gem_prime_export = drm_gem_prime_export,
142 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
143 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
144 .gem_prime_vmap = drm_gem_cma_prime_vmap,
145 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
146 .gem_prime_mmap = drm_gem_cma_prime_mmap,
147 .dumb_create = drm_gem_cma_dumb_create,
148 .fops = &shmob_drm_fops,
149 .name = "shmob-drm",
150 .desc = "Renesas SH Mobile DRM",
151 .date = "20120424",
152 .major = 1,
153 .minor = 0,
154 };
155
156 /* -----------------------------------------------------------------------------
157 * Power management
158 */
159
160 #ifdef CONFIG_PM_SLEEP
shmob_drm_pm_suspend(struct device * dev)161 static int shmob_drm_pm_suspend(struct device *dev)
162 {
163 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
164
165 drm_kms_helper_poll_disable(sdev->ddev);
166 shmob_drm_crtc_suspend(&sdev->crtc);
167
168 return 0;
169 }
170
shmob_drm_pm_resume(struct device * dev)171 static int shmob_drm_pm_resume(struct device *dev)
172 {
173 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
174
175 drm_modeset_lock_all(sdev->ddev);
176 shmob_drm_crtc_resume(&sdev->crtc);
177 drm_modeset_unlock_all(sdev->ddev);
178
179 drm_kms_helper_poll_enable(sdev->ddev);
180 return 0;
181 }
182 #endif
183
184 static const struct dev_pm_ops shmob_drm_pm_ops = {
185 SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
186 };
187
188 /* -----------------------------------------------------------------------------
189 * Platform driver
190 */
191
shmob_drm_remove(struct platform_device * pdev)192 static int shmob_drm_remove(struct platform_device *pdev)
193 {
194 struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
195 struct drm_device *ddev = sdev->ddev;
196
197 drm_dev_unregister(ddev);
198 drm_kms_helper_poll_fini(ddev);
199 drm_mode_config_cleanup(ddev);
200 drm_irq_uninstall(ddev);
201 drm_dev_unref(ddev);
202
203 return 0;
204 }
205
shmob_drm_probe(struct platform_device * pdev)206 static int shmob_drm_probe(struct platform_device *pdev)
207 {
208 struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
209 struct shmob_drm_device *sdev;
210 struct drm_device *ddev;
211 struct resource *res;
212 unsigned int i;
213 int ret;
214
215 if (pdata == NULL) {
216 dev_err(&pdev->dev, "no platform data\n");
217 return -EINVAL;
218 }
219
220 /*
221 * Allocate and initialize the driver private data, I/O resources and
222 * clocks.
223 */
224 sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
225 if (sdev == NULL)
226 return -ENOMEM;
227
228 sdev->dev = &pdev->dev;
229 sdev->pdata = pdata;
230 spin_lock_init(&sdev->irq_lock);
231
232 platform_set_drvdata(pdev, sdev);
233
234 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
235 sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
236 if (IS_ERR(sdev->mmio))
237 return PTR_ERR(sdev->mmio);
238
239 ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
240 if (ret < 0)
241 return ret;
242
243 ret = shmob_drm_init_interface(sdev);
244 if (ret < 0)
245 return ret;
246
247 /* Allocate and initialize the DRM device. */
248 ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev);
249 if (IS_ERR(ddev))
250 return PTR_ERR(ddev);
251
252 sdev->ddev = ddev;
253 ddev->dev_private = sdev;
254
255 ret = shmob_drm_modeset_init(sdev);
256 if (ret < 0) {
257 dev_err(&pdev->dev, "failed to initialize mode setting\n");
258 goto err_free_drm_dev;
259 }
260
261 for (i = 0; i < 4; ++i) {
262 ret = shmob_drm_plane_create(sdev, i);
263 if (ret < 0) {
264 dev_err(&pdev->dev, "failed to create plane %u\n", i);
265 goto err_modeset_cleanup;
266 }
267 }
268
269 ret = drm_vblank_init(ddev, 1);
270 if (ret < 0) {
271 dev_err(&pdev->dev, "failed to initialize vblank\n");
272 goto err_modeset_cleanup;
273 }
274
275 ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
276 if (ret < 0) {
277 dev_err(&pdev->dev, "failed to install IRQ handler\n");
278 goto err_modeset_cleanup;
279 }
280
281 /*
282 * Register the DRM device with the core and the connectors with
283 * sysfs.
284 */
285 ret = drm_dev_register(ddev, 0);
286 if (ret < 0)
287 goto err_irq_uninstall;
288
289 return 0;
290
291 err_irq_uninstall:
292 drm_irq_uninstall(ddev);
293 err_modeset_cleanup:
294 drm_kms_helper_poll_fini(ddev);
295 drm_mode_config_cleanup(ddev);
296 err_free_drm_dev:
297 drm_dev_unref(ddev);
298
299 return ret;
300 }
301
302 static struct platform_driver shmob_drm_platform_driver = {
303 .probe = shmob_drm_probe,
304 .remove = shmob_drm_remove,
305 .driver = {
306 .name = "shmob-drm",
307 .pm = &shmob_drm_pm_ops,
308 },
309 };
310
311 module_platform_driver(shmob_drm_platform_driver);
312
313 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
314 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
315 MODULE_LICENSE("GPL");
316