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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (C) 2016 Marek Vasut <marex@denx.de>4 *5 * This code is based on drivers/video/fbdev/mxsfb.c :6 * Copyright (C) 2010 Juergen Beisert, Pengutronix7 * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.8 * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.9 */10 11#include <linux/clk.h>12#include <linux/dma-mapping.h>13#include <linux/io.h>14#include <linux/mod_devicetable.h>15#include <linux/module.h>16#include <linux/platform_device.h>17#include <linux/property.h>18#include <linux/pm_runtime.h>19 20#include <drm/drm_atomic_helper.h>21#include <drm/drm_bridge.h>22#include <drm/drm_connector.h>23#include <drm/drm_drv.h>24#include <drm/drm_fbdev_dma.h>25#include <drm/drm_fourcc.h>26#include <drm/drm_gem_dma_helper.h>27#include <drm/drm_gem_framebuffer_helper.h>28#include <drm/drm_mode_config.h>29#include <drm/drm_module.h>30#include <drm/drm_of.h>31#include <drm/drm_probe_helper.h>32#include <drm/drm_vblank.h>33 34#include "mxsfb_drv.h"35#include "mxsfb_regs.h"36 37enum mxsfb_devtype {38 MXSFB_V3,39 MXSFB_V4,40 /*41 * Starting at i.MX6 the hardware version register is gone, use the42 * i.MX family number as the version.43 */44 MXSFB_V6,45};46 47static const struct mxsfb_devdata mxsfb_devdata[] = {48 [MXSFB_V3] = {49 .transfer_count = LCDC_V3_TRANSFER_COUNT,50 .cur_buf = LCDC_V3_CUR_BUF,51 .next_buf = LCDC_V3_NEXT_BUF,52 .hs_wdth_mask = 0xff,53 .hs_wdth_shift = 24,54 .has_overlay = false,55 .has_ctrl2 = false,56 .has_crc32 = false,57 },58 [MXSFB_V4] = {59 .transfer_count = LCDC_V4_TRANSFER_COUNT,60 .cur_buf = LCDC_V4_CUR_BUF,61 .next_buf = LCDC_V4_NEXT_BUF,62 .hs_wdth_mask = 0x3fff,63 .hs_wdth_shift = 18,64 .has_overlay = false,65 .has_ctrl2 = true,66 .has_crc32 = true,67 },68 [MXSFB_V6] = {69 .transfer_count = LCDC_V4_TRANSFER_COUNT,70 .cur_buf = LCDC_V4_CUR_BUF,71 .next_buf = LCDC_V4_NEXT_BUF,72 .hs_wdth_mask = 0x3fff,73 .hs_wdth_shift = 18,74 .has_overlay = true,75 .has_ctrl2 = true,76 .has_crc32 = true,77 },78};79 80void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)81{82 clk_prepare_enable(mxsfb->clk_axi);83}84 85void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)86{87 clk_disable_unprepare(mxsfb->clk_axi);88}89 90static struct drm_framebuffer *91mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv,92 const struct drm_mode_fb_cmd2 *mode_cmd)93{94 const struct drm_format_info *info;95 96 info = drm_get_format_info(dev, mode_cmd);97 if (!info)98 return ERR_PTR(-EINVAL);99 100 if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) {101 dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n");102 return ERR_PTR(-EINVAL);103 }104 105 return drm_gem_fb_create(dev, file_priv, mode_cmd);106}107 108static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {109 .fb_create = mxsfb_fb_create,110 .atomic_check = drm_atomic_helper_check,111 .atomic_commit = drm_atomic_helper_commit,112};113 114static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {115 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,116};117 118static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)119{120 struct drm_device *drm = mxsfb->drm;121 struct drm_connector_list_iter iter;122 struct drm_panel *panel;123 struct drm_bridge *bridge;124 int ret;125 126 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,127 &bridge);128 if (ret)129 return ret;130 131 if (panel) {132 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel,133 DRM_MODE_CONNECTOR_DPI);134 if (IS_ERR(bridge))135 return PTR_ERR(bridge);136 }137 138 if (!bridge)139 return -ENODEV;140 141 ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0);142 if (ret)143 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");144 145 mxsfb->bridge = bridge;146 147 /*148 * Get hold of the connector. This is a bit of a hack, until the bridge149 * API gives us bus flags and formats.150 */151 drm_connector_list_iter_begin(drm, &iter);152 mxsfb->connector = drm_connector_list_iter_next(&iter);153 drm_connector_list_iter_end(&iter);154 155 return 0;156}157 158static irqreturn_t mxsfb_irq_handler(int irq, void *data)159{160 struct drm_device *drm = data;161 struct mxsfb_drm_private *mxsfb = drm->dev_private;162 u32 reg, crc;163 u64 vbc;164 165 reg = readl(mxsfb->base + LCDC_CTRL1);166 167 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) {168 drm_crtc_handle_vblank(&mxsfb->crtc);169 if (mxsfb->crc_active) {170 crc = readl(mxsfb->base + LCDC_V4_CRC_STAT);171 vbc = drm_crtc_accurate_vblank_count(&mxsfb->crtc);172 drm_crtc_add_crc_entry(&mxsfb->crtc, true, vbc, &crc);173 }174 }175 176 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);177 178 return IRQ_HANDLED;179}180 181static void mxsfb_irq_disable(struct drm_device *drm)182{183 struct mxsfb_drm_private *mxsfb = drm->dev_private;184 185 mxsfb_enable_axi_clk(mxsfb);186 187 /* Disable and clear VBLANK IRQ */188 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);189 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);190 191 mxsfb_disable_axi_clk(mxsfb);192}193 194static int mxsfb_irq_install(struct drm_device *dev, int irq)195{196 if (irq == IRQ_NOTCONNECTED)197 return -ENOTCONN;198 199 mxsfb_irq_disable(dev);200 201 return request_irq(irq, mxsfb_irq_handler, 0, dev->driver->name, dev);202}203 204static void mxsfb_irq_uninstall(struct drm_device *dev)205{206 struct mxsfb_drm_private *mxsfb = dev->dev_private;207 208 mxsfb_irq_disable(dev);209 free_irq(mxsfb->irq, dev);210}211 212static int mxsfb_load(struct drm_device *drm,213 const struct mxsfb_devdata *devdata)214{215 struct platform_device *pdev = to_platform_device(drm->dev);216 struct mxsfb_drm_private *mxsfb;217 struct resource *res;218 int ret;219 220 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);221 if (!mxsfb)222 return -ENOMEM;223 224 mxsfb->drm = drm;225 drm->dev_private = mxsfb;226 mxsfb->devdata = devdata;227 228 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);229 mxsfb->base = devm_ioremap_resource(drm->dev, res);230 if (IS_ERR(mxsfb->base))231 return PTR_ERR(mxsfb->base);232 233 mxsfb->clk = devm_clk_get(drm->dev, NULL);234 if (IS_ERR(mxsfb->clk))235 return PTR_ERR(mxsfb->clk);236 237 mxsfb->clk_axi = devm_clk_get_optional(drm->dev, "axi");238 if (IS_ERR(mxsfb->clk_axi))239 return PTR_ERR(mxsfb->clk_axi);240 241 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");242 if (IS_ERR(mxsfb->clk_disp_axi))243 mxsfb->clk_disp_axi = NULL;244 245 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));246 if (ret)247 return ret;248 249 pm_runtime_enable(drm->dev);250 251 /* Modeset init */252 ret = drmm_mode_config_init(drm);253 if (ret) {254 dev_err(drm->dev, "Failed to initialize mode config\n");255 goto err_vblank;256 }257 258 ret = mxsfb_kms_init(mxsfb);259 if (ret < 0) {260 dev_err(drm->dev, "Failed to initialize KMS pipeline\n");261 goto err_vblank;262 }263 264 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);265 if (ret < 0) {266 dev_err(drm->dev, "Failed to initialise vblank\n");267 goto err_vblank;268 }269 270 /* Start with vertical blanking interrupt reporting disabled. */271 drm_crtc_vblank_off(&mxsfb->crtc);272 273 ret = mxsfb_attach_bridge(mxsfb);274 if (ret) {275 dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");276 goto err_vblank;277 }278 279 drm->mode_config.min_width = MXSFB_MIN_XRES;280 drm->mode_config.min_height = MXSFB_MIN_YRES;281 drm->mode_config.max_width = MXSFB_MAX_XRES;282 drm->mode_config.max_height = MXSFB_MAX_YRES;283 drm->mode_config.funcs = &mxsfb_mode_config_funcs;284 drm->mode_config.helper_private = &mxsfb_mode_config_helpers;285 286 drm_mode_config_reset(drm);287 288 ret = platform_get_irq(pdev, 0);289 if (ret < 0)290 goto err_vblank;291 mxsfb->irq = ret;292 293 pm_runtime_get_sync(drm->dev);294 ret = mxsfb_irq_install(drm, mxsfb->irq);295 pm_runtime_put_sync(drm->dev);296 297 if (ret < 0) {298 dev_err(drm->dev, "Failed to install IRQ handler\n");299 goto err_vblank;300 }301 302 drm_kms_helper_poll_init(drm);303 304 platform_set_drvdata(pdev, drm);305 306 drm_helper_hpd_irq_event(drm);307 308 return 0;309 310err_vblank:311 pm_runtime_disable(drm->dev);312 313 return ret;314}315 316static void mxsfb_unload(struct drm_device *drm)317{318 drm_kms_helper_poll_fini(drm);319 320 pm_runtime_get_sync(drm->dev);321 mxsfb_irq_uninstall(drm);322 pm_runtime_put_sync(drm->dev);323 324 drm->dev_private = NULL;325 326 pm_runtime_disable(drm->dev);327}328 329DEFINE_DRM_GEM_DMA_FOPS(fops);330 331static const struct drm_driver mxsfb_driver = {332 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,333 DRM_GEM_DMA_DRIVER_OPS,334 .fops = &fops,335 .name = "mxsfb-drm",336 .desc = "MXSFB Controller DRM",337 .date = "20160824",338 .major = 1,339 .minor = 0,340};341 342static const struct of_device_id mxsfb_dt_ids[] = {343 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], },344 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], },345 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], },346 { /* sentinel */ }347};348MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);349 350static int mxsfb_probe(struct platform_device *pdev)351{352 struct drm_device *drm;353 int ret;354 355 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);356 if (IS_ERR(drm))357 return PTR_ERR(drm);358 359 ret = mxsfb_load(drm, device_get_match_data(&pdev->dev));360 if (ret)361 goto err_free;362 363 ret = drm_dev_register(drm, 0);364 if (ret)365 goto err_unload;366 367 drm_fbdev_dma_setup(drm, 32);368 369 return 0;370 371err_unload:372 mxsfb_unload(drm);373err_free:374 drm_dev_put(drm);375 376 return ret;377}378 379static void mxsfb_remove(struct platform_device *pdev)380{381 struct drm_device *drm = platform_get_drvdata(pdev);382 383 drm_dev_unregister(drm);384 drm_atomic_helper_shutdown(drm);385 mxsfb_unload(drm);386 drm_dev_put(drm);387}388 389static void mxsfb_shutdown(struct platform_device *pdev)390{391 struct drm_device *drm = platform_get_drvdata(pdev);392 393 drm_atomic_helper_shutdown(drm);394}395 396#ifdef CONFIG_PM_SLEEP397static int mxsfb_suspend(struct device *dev)398{399 struct drm_device *drm = dev_get_drvdata(dev);400 401 return drm_mode_config_helper_suspend(drm);402}403 404static int mxsfb_resume(struct device *dev)405{406 struct drm_device *drm = dev_get_drvdata(dev);407 408 return drm_mode_config_helper_resume(drm);409}410#endif411 412static const struct dev_pm_ops mxsfb_pm_ops = {413 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)414};415 416static struct platform_driver mxsfb_platform_driver = {417 .probe = mxsfb_probe,418 .remove_new = mxsfb_remove,419 .shutdown = mxsfb_shutdown,420 .driver = {421 .name = "mxsfb",422 .of_match_table = mxsfb_dt_ids,423 .pm = &mxsfb_pm_ops,424 },425};426 427drm_module_platform_driver(mxsfb_platform_driver);428 429MODULE_AUTHOR("Marek Vasut <marex@denx.de>");430MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");431MODULE_LICENSE("GPL");432