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1// SPDX-License-Identifier: GPL-2.0+2/*3 * shmob_drm_drv.c -- SH Mobile DRM driver4 *5 * Copyright (C) 2012 Renesas Electronics Corporation6 *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/of.h>15#include <linux/platform_device.h>16#include <linux/pm.h>17#include <linux/pm_runtime.h>18#include <linux/slab.h>19 20#include <drm/drm_atomic_helper.h>21#include <drm/drm_drv.h>22#include <drm/drm_fbdev_dma.h>23#include <drm/drm_gem_dma_helper.h>24#include <drm/drm_modeset_helper.h>25#include <drm/drm_module.h>26#include <drm/drm_probe_helper.h>27#include <drm/drm_vblank.h>28 29#include "shmob_drm_drv.h"30#include "shmob_drm_kms.h"31#include "shmob_drm_plane.h"32#include "shmob_drm_regs.h"33 34/* -----------------------------------------------------------------------------35 * Hardware initialization36 */37 38static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,39 enum shmob_drm_clk_source clksrc)40{41 struct clk *clk;42 char *clkname;43 44 switch (clksrc) {45 case SHMOB_DRM_CLK_BUS:46 clkname = "fck";47 sdev->lddckr = LDDCKR_ICKSEL_BUS;48 break;49 case SHMOB_DRM_CLK_PERIPHERAL:50 clkname = "media";51 sdev->lddckr = LDDCKR_ICKSEL_MIPI;52 break;53 case SHMOB_DRM_CLK_EXTERNAL:54 clkname = "lclk";55 sdev->lddckr = LDDCKR_ICKSEL_HDMI;56 break;57 default:58 return -EINVAL;59 }60 61 clk = devm_clk_get(sdev->dev, clkname);62 if (IS_ERR(clk)) {63 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);64 return PTR_ERR(clk);65 }66 67 sdev->clock = clk;68 return 0;69}70 71/* -----------------------------------------------------------------------------72 * DRM operations73 */74 75static irqreturn_t shmob_drm_irq(int irq, void *arg)76{77 struct drm_device *dev = arg;78 struct shmob_drm_device *sdev = to_shmob_device(dev);79 unsigned long flags;80 u32 status;81 82 /* Acknowledge interrupts. Putting interrupt enable and interrupt flag83 * bits in the same register is really brain-dead design and requires84 * taking a spinlock.85 */86 spin_lock_irqsave(&sdev->irq_lock, flags);87 status = lcdc_read(sdev, LDINTR);88 lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);89 spin_unlock_irqrestore(&sdev->irq_lock, flags);90 91 if (status & LDINTR_VES) {92 drm_crtc_handle_vblank(&sdev->crtc.base);93 shmob_drm_crtc_finish_page_flip(&sdev->crtc);94 }95 96 return IRQ_HANDLED;97}98 99DEFINE_DRM_GEM_DMA_FOPS(shmob_drm_fops);100 101static const struct drm_driver shmob_drm_driver = {102 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,103 DRM_GEM_DMA_DRIVER_OPS,104 .fops = &shmob_drm_fops,105 .name = "shmob-drm",106 .desc = "Renesas SH Mobile DRM",107 .date = "20120424",108 .major = 1,109 .minor = 0,110};111 112/* -----------------------------------------------------------------------------113 * Power management114 */115 116static int shmob_drm_pm_suspend(struct device *dev)117{118 struct shmob_drm_device *sdev = dev_get_drvdata(dev);119 120 return drm_mode_config_helper_suspend(&sdev->ddev);121}122 123static int shmob_drm_pm_resume(struct device *dev)124{125 struct shmob_drm_device *sdev = dev_get_drvdata(dev);126 127 return drm_mode_config_helper_resume(&sdev->ddev);128}129 130static int shmob_drm_pm_runtime_suspend(struct device *dev)131{132 struct shmob_drm_device *sdev = dev_get_drvdata(dev);133 134 if (sdev->clock)135 clk_disable_unprepare(sdev->clock);136 137 return 0;138}139 140static int shmob_drm_pm_runtime_resume(struct device *dev)141{142 struct shmob_drm_device *sdev = dev_get_drvdata(dev);143 int ret;144 145 if (sdev->clock) {146 ret = clk_prepare_enable(sdev->clock);147 if (ret < 0)148 return ret;149 }150 151 return 0;152}153 154static const struct dev_pm_ops shmob_drm_pm_ops = {155 SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)156 RUNTIME_PM_OPS(shmob_drm_pm_runtime_suspend,157 shmob_drm_pm_runtime_resume, NULL)158};159 160/* -----------------------------------------------------------------------------161 * Platform driver162 */163 164static void shmob_drm_remove(struct platform_device *pdev)165{166 struct shmob_drm_device *sdev = platform_get_drvdata(pdev);167 struct drm_device *ddev = &sdev->ddev;168 169 drm_dev_unregister(ddev);170 drm_atomic_helper_shutdown(ddev);171 drm_kms_helper_poll_fini(ddev);172}173 174static void shmob_drm_shutdown(struct platform_device *pdev)175{176 struct shmob_drm_device *sdev = platform_get_drvdata(pdev);177 178 drm_atomic_helper_shutdown(&sdev->ddev);179}180 181static int shmob_drm_probe(struct platform_device *pdev)182{183 struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;184 const struct shmob_drm_config *config;185 struct shmob_drm_device *sdev;186 struct drm_device *ddev;187 int ret;188 189 config = of_device_get_match_data(&pdev->dev);190 if (!config && !pdata) {191 dev_err(&pdev->dev, "no platform data\n");192 return -EINVAL;193 }194 195 /*196 * Allocate and initialize the DRM device, driver private data, I/O197 * resources and clocks.198 */199 sdev = devm_drm_dev_alloc(&pdev->dev, &shmob_drm_driver,200 struct shmob_drm_device, ddev);201 if (IS_ERR(sdev))202 return PTR_ERR(sdev);203 204 ddev = &sdev->ddev;205 sdev->dev = &pdev->dev;206 if (config) {207 sdev->config = *config;208 } else {209 sdev->pdata = pdata;210 sdev->config.clk_source = pdata->clk_source;211 sdev->config.clk_div = pdata->iface.clk_div;212 }213 spin_lock_init(&sdev->irq_lock);214 215 platform_set_drvdata(pdev, sdev);216 217 sdev->mmio = devm_platform_ioremap_resource(pdev, 0);218 if (IS_ERR(sdev->mmio))219 return PTR_ERR(sdev->mmio);220 221 ret = shmob_drm_setup_clocks(sdev, sdev->config.clk_source);222 if (ret < 0)223 return ret;224 225 ret = devm_pm_runtime_enable(&pdev->dev);226 if (ret)227 return ret;228 229 ret = drm_vblank_init(ddev, 1);230 if (ret < 0) {231 dev_err(&pdev->dev, "failed to initialize vblank\n");232 return ret;233 }234 235 ret = shmob_drm_modeset_init(sdev);236 if (ret < 0)237 return dev_err_probe(&pdev->dev, ret,238 "failed to initialize mode setting\n");239 240 ret = platform_get_irq(pdev, 0);241 if (ret < 0)242 goto err_modeset_cleanup;243 sdev->irq = ret;244 245 ret = devm_request_irq(&pdev->dev, sdev->irq, shmob_drm_irq, 0,246 ddev->driver->name, ddev);247 if (ret < 0) {248 dev_err(&pdev->dev, "failed to install IRQ handler\n");249 goto err_modeset_cleanup;250 }251 252 /*253 * Register the DRM device with the core and the connectors with254 * sysfs.255 */256 ret = drm_dev_register(ddev, 0);257 if (ret < 0)258 goto err_modeset_cleanup;259 260 drm_fbdev_dma_setup(ddev, 16);261 262 return 0;263 264err_modeset_cleanup:265 drm_kms_helper_poll_fini(ddev);266 return ret;267}268 269static const struct shmob_drm_config shmob_arm_config = {270 .clk_source = SHMOB_DRM_CLK_BUS,271 .clk_div = 5,272};273 274static const struct of_device_id shmob_drm_of_table[] __maybe_unused = {275 { .compatible = "renesas,r8a7740-lcdc", .data = &shmob_arm_config, },276 { .compatible = "renesas,sh73a0-lcdc", .data = &shmob_arm_config, },277 { /* sentinel */ }278};279 280static struct platform_driver shmob_drm_platform_driver = {281 .probe = shmob_drm_probe,282 .remove_new = shmob_drm_remove,283 .shutdown = shmob_drm_shutdown,284 .driver = {285 .name = "shmob-drm",286 .of_match_table = of_match_ptr(shmob_drm_of_table),287 .pm = &shmob_drm_pm_ops,288 },289};290 291drm_module_platform_driver(shmob_drm_platform_driver);292 293MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");294MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");295MODULE_LICENSE("GPL");296