2 * Copyright 2015 Freescale Semiconductor, Inc.
4 * Freescale DCU drm device driver
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
12 #include <linux/clk.h>
13 #include <linux/clk-provider.h>
14 #include <linux/console.h>
16 #include <linux/mfd/syscon.h>
18 #include <linux/module.h>
19 #include <linux/of_platform.h>
20 #include <linux/platform_device.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/regmap.h>
26 #include <drm/drm_atomic_helper.h>
27 #include <drm/drm_crtc_helper.h>
28 #include <drm/drm_fb_cma_helper.h>
29 #include <drm/drm_gem_cma_helper.h>
31 #include "fsl_dcu_drm_crtc.h"
32 #include "fsl_dcu_drm_drv.h"
35 static int legacyfb_depth = 24;
36 module_param(legacyfb_depth, int, 0444);
38 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
40 if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
46 static const struct regmap_config fsl_dcu_regmap_config = {
51 .volatile_reg = fsl_dcu_drm_is_volatile_reg,
54 static void fsl_dcu_irq_uninstall(struct drm_device *dev)
56 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
58 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
59 regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
62 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
64 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
67 ret = fsl_dcu_drm_modeset_init(fsl_dev);
69 dev_err(dev->dev, "failed to initialize mode setting\n");
73 ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
75 dev_err(dev->dev, "failed to initialize vblank\n");
79 ret = drm_irq_install(dev, fsl_dev->irq);
81 dev_err(dev->dev, "failed to install IRQ handler\n");
85 if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
86 legacyfb_depth != 32) {
88 "Invalid legacyfb_depth. Defaulting to 24bpp\n");
91 fsl_dev->fbdev = drm_fbdev_cma_init(dev, legacyfb_depth, 1);
92 if (IS_ERR(fsl_dev->fbdev)) {
93 ret = PTR_ERR(fsl_dev->fbdev);
94 fsl_dev->fbdev = NULL;
100 drm_kms_helper_poll_fini(dev);
103 drm_fbdev_cma_fini(fsl_dev->fbdev);
105 drm_mode_config_cleanup(dev);
106 drm_irq_uninstall(dev);
107 dev->dev_private = NULL;
112 static void fsl_dcu_unload(struct drm_device *dev)
114 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
116 drm_atomic_helper_shutdown(dev);
117 drm_kms_helper_poll_fini(dev);
120 drm_fbdev_cma_fini(fsl_dev->fbdev);
122 drm_mode_config_cleanup(dev);
123 drm_irq_uninstall(dev);
125 dev->dev_private = NULL;
128 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
130 struct drm_device *dev = arg;
131 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
132 unsigned int int_status;
135 ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
137 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
141 if (int_status & DCU_INT_STATUS_VBLANK)
142 drm_handle_vblank(dev, 0);
144 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
149 static void fsl_dcu_drm_lastclose(struct drm_device *dev)
151 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
153 drm_fbdev_cma_restore_mode(fsl_dev->fbdev);
156 DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
158 static struct drm_driver fsl_dcu_drm_driver = {
159 .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
160 | DRIVER_PRIME | DRIVER_ATOMIC,
161 .lastclose = fsl_dcu_drm_lastclose,
162 .load = fsl_dcu_load,
163 .unload = fsl_dcu_unload,
164 .irq_handler = fsl_dcu_drm_irq,
165 .irq_preinstall = fsl_dcu_irq_uninstall,
166 .irq_uninstall = fsl_dcu_irq_uninstall,
167 .gem_free_object_unlocked = drm_gem_cma_free_object,
168 .gem_vm_ops = &drm_gem_cma_vm_ops,
169 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
170 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
171 .gem_prime_import = drm_gem_prime_import,
172 .gem_prime_export = drm_gem_prime_export,
173 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
174 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
175 .gem_prime_vmap = drm_gem_cma_prime_vmap,
176 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
177 .gem_prime_mmap = drm_gem_cma_prime_mmap,
178 .dumb_create = drm_gem_cma_dumb_create,
179 .fops = &fsl_dcu_drm_fops,
180 .name = "fsl-dcu-drm",
181 .desc = "Freescale DCU DRM",
187 #ifdef CONFIG_PM_SLEEP
188 static int fsl_dcu_drm_pm_suspend(struct device *dev)
190 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
195 disable_irq(fsl_dev->irq);
196 drm_kms_helper_poll_disable(fsl_dev->drm);
199 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 1);
202 fsl_dev->state = drm_atomic_helper_suspend(fsl_dev->drm);
203 if (IS_ERR(fsl_dev->state)) {
205 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
208 drm_kms_helper_poll_enable(fsl_dev->drm);
209 enable_irq(fsl_dev->irq);
210 return PTR_ERR(fsl_dev->state);
213 clk_disable_unprepare(fsl_dev->clk);
218 static int fsl_dcu_drm_pm_resume(struct device *dev)
220 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
226 ret = clk_prepare_enable(fsl_dev->clk);
228 dev_err(dev, "failed to enable dcu clk\n");
233 fsl_tcon_bypass_enable(fsl_dev->tcon);
234 fsl_dcu_drm_init_planes(fsl_dev->drm);
235 enable_irq(fsl_dev->irq);
236 drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state);
239 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
242 drm_kms_helper_poll_enable(fsl_dev->drm);
248 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
249 SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
252 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
256 .layer_regs = LS1021A_LAYER_REG_NUM,
259 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
263 .layer_regs = VF610_LAYER_REG_NUM,
266 static const struct of_device_id fsl_dcu_of_match[] = {
268 .compatible = "fsl,ls1021a-dcu",
269 .data = &fsl_dcu_ls1021a_data,
271 .compatible = "fsl,vf610-dcu",
272 .data = &fsl_dcu_vf610_data,
276 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
278 static int fsl_dcu_drm_probe(struct platform_device *pdev)
280 struct fsl_dcu_drm_device *fsl_dev;
281 struct drm_device *drm;
282 struct device *dev = &pdev->dev;
283 struct resource *res;
285 struct drm_driver *driver = &fsl_dcu_drm_driver;
286 struct clk *pix_clk_in;
287 char pix_clk_name[32];
288 const char *pix_clk_in_name;
289 const struct of_device_id *id;
291 u8 div_ratio_shift = 0;
293 fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
297 id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
300 fsl_dev->soc = id->data;
302 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
303 base = devm_ioremap_resource(dev, res);
309 fsl_dev->irq = platform_get_irq(pdev, 0);
310 if (fsl_dev->irq < 0) {
311 dev_err(dev, "failed to get irq\n");
315 fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
316 &fsl_dcu_regmap_config);
317 if (IS_ERR(fsl_dev->regmap)) {
318 dev_err(dev, "regmap init failed\n");
319 return PTR_ERR(fsl_dev->regmap);
322 fsl_dev->clk = devm_clk_get(dev, "dcu");
323 if (IS_ERR(fsl_dev->clk)) {
324 dev_err(dev, "failed to get dcu clock\n");
325 return PTR_ERR(fsl_dev->clk);
327 ret = clk_prepare_enable(fsl_dev->clk);
329 dev_err(dev, "failed to enable dcu clk\n");
333 pix_clk_in = devm_clk_get(dev, "pix");
334 if (IS_ERR(pix_clk_in)) {
335 /* legancy binding, use dcu clock as pixel clock input */
336 pix_clk_in = fsl_dev->clk;
339 if (of_property_read_bool(dev->of_node, "big-endian"))
340 div_ratio_shift = 24;
342 pix_clk_in_name = __clk_get_name(pix_clk_in);
343 snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
344 fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
345 pix_clk_in_name, 0, base + DCU_DIV_RATIO,
346 div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
347 if (IS_ERR(fsl_dev->pix_clk)) {
348 dev_err(dev, "failed to register pix clk\n");
349 ret = PTR_ERR(fsl_dev->pix_clk);
353 fsl_dev->tcon = fsl_tcon_init(dev);
355 drm = drm_dev_alloc(driver, dev);
358 goto unregister_pix_clk;
363 fsl_dev->np = dev->of_node;
364 drm->dev_private = fsl_dev;
365 dev_set_drvdata(dev, fsl_dev);
367 ret = drm_dev_register(drm, 0);
376 clk_unregister(fsl_dev->pix_clk);
378 clk_disable_unprepare(fsl_dev->clk);
382 static int fsl_dcu_drm_remove(struct platform_device *pdev)
384 struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
386 drm_dev_unregister(fsl_dev->drm);
387 drm_dev_unref(fsl_dev->drm);
388 clk_disable_unprepare(fsl_dev->clk);
389 clk_unregister(fsl_dev->pix_clk);
394 static struct platform_driver fsl_dcu_drm_platform_driver = {
395 .probe = fsl_dcu_drm_probe,
396 .remove = fsl_dcu_drm_remove,
399 .pm = &fsl_dcu_drm_pm_ops,
400 .of_match_table = fsl_dcu_of_match,
404 module_platform_driver(fsl_dcu_drm_platform_driver);
406 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
407 MODULE_LICENSE("GPL");