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Linux/drivers/gpu/drm/shmobile/shmob_drm_drv.c

  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_crtc.h"
 27 #include "shmob_drm_drv.h"
 28 #include "shmob_drm_kms.h"
 29 #include "shmob_drm_plane.h"
 30 #include "shmob_drm_regs.h"
 31 
 32 /* -----------------------------------------------------------------------------
 33  * Hardware initialization
 34  */
 35 
 36 static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
 37 {
 38         static const u32 ldmt1r[] = {
 39                 [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
 40                 [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
 41                 [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
 42                 [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
 43                 [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
 44                 [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
 45                 [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
 46                 [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
 47                 [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
 48                 [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
 49                 [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
 50                 [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
 51                 [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
 52                 [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
 53                 [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
 54                 [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
 55                 [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
 56                 [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
 57                 [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
 58         };
 59 
 60         if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
 61                 dev_err(sdev->dev, "invalid interface type %u\n",
 62                         sdev->pdata->iface.interface);
 63                 return -EINVAL;
 64         }
 65 
 66         sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
 67         return 0;
 68 }
 69 
 70 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
 71                                             enum shmob_drm_clk_source clksrc)
 72 {
 73         struct clk *clk;
 74         char *clkname;
 75 
 76         switch (clksrc) {
 77         case SHMOB_DRM_CLK_BUS:
 78                 clkname = "bus_clk";
 79                 sdev->lddckr = LDDCKR_ICKSEL_BUS;
 80                 break;
 81         case SHMOB_DRM_CLK_PERIPHERAL:
 82                 clkname = "peripheral_clk";
 83                 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
 84                 break;
 85         case SHMOB_DRM_CLK_EXTERNAL:
 86                 clkname = NULL;
 87                 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
 88                 break;
 89         default:
 90                 return -EINVAL;
 91         }
 92 
 93         clk = devm_clk_get(sdev->dev, clkname);
 94         if (IS_ERR(clk)) {
 95                 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
 96                 return PTR_ERR(clk);
 97         }
 98 
 99         sdev->clock = clk;
100         return 0;
101 }
102 
103 /* -----------------------------------------------------------------------------
104  * DRM operations
105  */
106 
107 static int shmob_drm_unload(struct drm_device *dev)
108 {
109         drm_kms_helper_poll_fini(dev);
110         drm_mode_config_cleanup(dev);
111         drm_vblank_cleanup(dev);
112         drm_irq_uninstall(dev);
113 
114         dev->dev_private = NULL;
115 
116         return 0;
117 }
118 
119 static int shmob_drm_load(struct drm_device *dev, unsigned long flags)
120 {
121         struct shmob_drm_platform_data *pdata = dev->dev->platform_data;
122         struct platform_device *pdev = dev->platformdev;
123         struct shmob_drm_device *sdev;
124         struct resource *res;
125         unsigned int i;
126         int ret;
127 
128         if (pdata == NULL) {
129                 dev_err(dev->dev, "no platform data\n");
130                 return -EINVAL;
131         }
132 
133         sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
134         if (sdev == NULL) {
135                 dev_err(dev->dev, "failed to allocate private data\n");
136                 return -ENOMEM;
137         }
138 
139         sdev->dev = &pdev->dev;
140         sdev->pdata = pdata;
141         spin_lock_init(&sdev->irq_lock);
142 
143         sdev->ddev = dev;
144         dev->dev_private = sdev;
145 
146         /* I/O resources and clocks */
147         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
148         if (res == NULL) {
149                 dev_err(&pdev->dev, "failed to get memory resource\n");
150                 return -EINVAL;
151         }
152 
153         sdev->mmio = devm_ioremap_nocache(&pdev->dev, res->start,
154                                           resource_size(res));
155         if (sdev->mmio == NULL) {
156                 dev_err(&pdev->dev, "failed to remap memory resource\n");
157                 return -ENOMEM;
158         }
159 
160         ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
161         if (ret < 0)
162                 return ret;
163 
164         ret = shmob_drm_init_interface(sdev);
165         if (ret < 0)
166                 return ret;
167 
168         ret = shmob_drm_modeset_init(sdev);
169         if (ret < 0) {
170                 dev_err(&pdev->dev, "failed to initialize mode setting\n");
171                 return ret;
172         }
173 
174         for (i = 0; i < 4; ++i) {
175                 ret = shmob_drm_plane_create(sdev, i);
176                 if (ret < 0) {
177                         dev_err(&pdev->dev, "failed to create plane %u\n", i);
178                         goto done;
179                 }
180         }
181 
182         ret = drm_vblank_init(dev, 1);
183         if (ret < 0) {
184                 dev_err(&pdev->dev, "failed to initialize vblank\n");
185                 goto done;
186         }
187 
188         ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
189         if (ret < 0) {
190                 dev_err(&pdev->dev, "failed to install IRQ handler\n");
191                 goto done;
192         }
193 
194         platform_set_drvdata(pdev, sdev);
195 
196 done:
197         if (ret)
198                 shmob_drm_unload(dev);
199 
200         return ret;
201 }
202 
203 static irqreturn_t shmob_drm_irq(int irq, void *arg)
204 {
205         struct drm_device *dev = arg;
206         struct shmob_drm_device *sdev = dev->dev_private;
207         unsigned long flags;
208         u32 status;
209 
210         /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
211          * bits in the same register is really brain-dead design and requires
212          * taking a spinlock.
213          */
214         spin_lock_irqsave(&sdev->irq_lock, flags);
215         status = lcdc_read(sdev, LDINTR);
216         lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
217         spin_unlock_irqrestore(&sdev->irq_lock, flags);
218 
219         if (status & LDINTR_VES) {
220                 drm_handle_vblank(dev, 0);
221                 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
222         }
223 
224         return IRQ_HANDLED;
225 }
226 
227 static int shmob_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
228 {
229         struct shmob_drm_device *sdev = dev->dev_private;
230 
231         shmob_drm_crtc_enable_vblank(sdev, true);
232 
233         return 0;
234 }
235 
236 static void shmob_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
237 {
238         struct shmob_drm_device *sdev = dev->dev_private;
239 
240         shmob_drm_crtc_enable_vblank(sdev, false);
241 }
242 
243 static const struct file_operations shmob_drm_fops = {
244         .owner          = THIS_MODULE,
245         .open           = drm_open,
246         .release        = drm_release,
247         .unlocked_ioctl = drm_ioctl,
248         .compat_ioctl   = drm_compat_ioctl,
249         .poll           = drm_poll,
250         .read           = drm_read,
251         .llseek         = no_llseek,
252         .mmap           = drm_gem_cma_mmap,
253 };
254 
255 static struct drm_driver shmob_drm_driver = {
256         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
257                                 | DRIVER_PRIME,
258         .load                   = shmob_drm_load,
259         .unload                 = shmob_drm_unload,
260         .irq_handler            = shmob_drm_irq,
261         .get_vblank_counter     = drm_vblank_no_hw_counter,
262         .enable_vblank          = shmob_drm_enable_vblank,
263         .disable_vblank         = shmob_drm_disable_vblank,
264         .gem_free_object_unlocked = drm_gem_cma_free_object,
265         .gem_vm_ops             = &drm_gem_cma_vm_ops,
266         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
267         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
268         .gem_prime_import       = drm_gem_prime_import,
269         .gem_prime_export       = drm_gem_prime_export,
270         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
271         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
272         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
273         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
274         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
275         .dumb_create            = drm_gem_cma_dumb_create,
276         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
277         .dumb_destroy           = drm_gem_dumb_destroy,
278         .fops                   = &shmob_drm_fops,
279         .name                   = "shmob-drm",
280         .desc                   = "Renesas SH Mobile DRM",
281         .date                   = "20120424",
282         .major                  = 1,
283         .minor                  = 0,
284 };
285 
286 /* -----------------------------------------------------------------------------
287  * Power management
288  */
289 
290 #ifdef CONFIG_PM_SLEEP
291 static int shmob_drm_pm_suspend(struct device *dev)
292 {
293         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
294 
295         drm_kms_helper_poll_disable(sdev->ddev);
296         shmob_drm_crtc_suspend(&sdev->crtc);
297 
298         return 0;
299 }
300 
301 static int shmob_drm_pm_resume(struct device *dev)
302 {
303         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
304 
305         drm_modeset_lock_all(sdev->ddev);
306         shmob_drm_crtc_resume(&sdev->crtc);
307         drm_modeset_unlock_all(sdev->ddev);
308 
309         drm_kms_helper_poll_enable(sdev->ddev);
310         return 0;
311 }
312 #endif
313 
314 static const struct dev_pm_ops shmob_drm_pm_ops = {
315         SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
316 };
317 
318 /* -----------------------------------------------------------------------------
319  * Platform driver
320  */
321 
322 static int shmob_drm_probe(struct platform_device *pdev)
323 {
324         return drm_platform_init(&shmob_drm_driver, pdev);
325 }
326 
327 static int shmob_drm_remove(struct platform_device *pdev)
328 {
329         struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
330 
331         drm_put_dev(sdev->ddev);
332 
333         return 0;
334 }
335 
336 static struct platform_driver shmob_drm_platform_driver = {
337         .probe          = shmob_drm_probe,
338         .remove         = shmob_drm_remove,
339         .driver         = {
340                 .name   = "shmob-drm",
341                 .pm     = &shmob_drm_pm_ops,
342         },
343 };
344 
345 module_platform_driver(shmob_drm_platform_driver);
346 
347 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
348 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
349 MODULE_LICENSE("GPL");
350 

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