1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * shmob_drm_drv.c -- SH Mobile DRM driver 4 * 5 * Copyright (C) 2012 Renesas Electronics Corporation 6 * 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/clients/drm_client_setup.h> 21 #include <drm/drm_atomic_helper.h> 22 #include <drm/drm_drv.h> 23 #include <drm/drm_fbdev_dma.h> 24 #include <drm/drm_fourcc.h> 25 #include <drm/drm_gem_dma_helper.h> 26 #include <drm/drm_modeset_helper.h> 27 #include <drm/drm_module.h> 28 #include <drm/drm_probe_helper.h> 29 #include <drm/drm_vblank.h> 30 31 #include "shmob_drm_drv.h" 32 #include "shmob_drm_kms.h" 33 #include "shmob_drm_plane.h" 34 #include "shmob_drm_regs.h" 35 36 /* ----------------------------------------------------------------------------- 37 * Hardware initialization 38 */ 39 40 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev, 41 enum shmob_drm_clk_source clksrc) 42 { 43 struct clk *clk; 44 char *clkname; 45 46 switch (clksrc) { 47 case SHMOB_DRM_CLK_BUS: 48 clkname = "fck"; 49 sdev->lddckr = LDDCKR_ICKSEL_BUS; 50 break; 51 case SHMOB_DRM_CLK_PERIPHERAL: 52 clkname = "media"; 53 sdev->lddckr = LDDCKR_ICKSEL_MIPI; 54 break; 55 case SHMOB_DRM_CLK_EXTERNAL: 56 clkname = "lclk"; 57 sdev->lddckr = LDDCKR_ICKSEL_HDMI; 58 break; 59 default: 60 return -EINVAL; 61 } 62 63 clk = devm_clk_get(sdev->dev, clkname); 64 if (IS_ERR(clk)) { 65 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname); 66 return PTR_ERR(clk); 67 } 68 69 sdev->clock = clk; 70 return 0; 71 } 72 73 /* ----------------------------------------------------------------------------- 74 * DRM operations 75 */ 76 77 static irqreturn_t shmob_drm_irq(int irq, void *arg) 78 { 79 struct drm_device *dev = arg; 80 struct shmob_drm_device *sdev = to_shmob_device(dev); 81 unsigned long flags; 82 u32 status; 83 84 /* Acknowledge interrupts. Putting interrupt enable and interrupt flag 85 * bits in the same register is really brain-dead design and requires 86 * taking a spinlock. 87 */ 88 spin_lock_irqsave(&sdev->irq_lock, flags); 89 status = lcdc_read(sdev, LDINTR); 90 lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK); 91 spin_unlock_irqrestore(&sdev->irq_lock, flags); 92 93 if (status & LDINTR_VES) { 94 drm_crtc_handle_vblank(&sdev->crtc.base); 95 shmob_drm_crtc_finish_page_flip(&sdev->crtc); 96 } 97 98 return IRQ_HANDLED; 99 } 100 101 DEFINE_DRM_GEM_DMA_FOPS(shmob_drm_fops); 102 103 static const struct drm_driver shmob_drm_driver = { 104 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 105 DRM_GEM_DMA_DRIVER_OPS, 106 DRM_FBDEV_DMA_DRIVER_OPS, 107 .fops = &shmob_drm_fops, 108 .name = "shmob-drm", 109 .desc = "Renesas SH Mobile DRM", 110 .major = 1, 111 .minor = 0, 112 }; 113 114 /* ----------------------------------------------------------------------------- 115 * Power management 116 */ 117 118 static int shmob_drm_pm_suspend(struct device *dev) 119 { 120 struct shmob_drm_device *sdev = dev_get_drvdata(dev); 121 122 return drm_mode_config_helper_suspend(&sdev->ddev); 123 } 124 125 static int shmob_drm_pm_resume(struct device *dev) 126 { 127 struct shmob_drm_device *sdev = dev_get_drvdata(dev); 128 129 return drm_mode_config_helper_resume(&sdev->ddev); 130 } 131 132 static int shmob_drm_pm_runtime_suspend(struct device *dev) 133 { 134 struct shmob_drm_device *sdev = dev_get_drvdata(dev); 135 136 if (sdev->clock) 137 clk_disable_unprepare(sdev->clock); 138 139 return 0; 140 } 141 142 static int shmob_drm_pm_runtime_resume(struct device *dev) 143 { 144 struct shmob_drm_device *sdev = dev_get_drvdata(dev); 145 int ret; 146 147 if (sdev->clock) { 148 ret = clk_prepare_enable(sdev->clock); 149 if (ret < 0) 150 return ret; 151 } 152 153 return 0; 154 } 155 156 static const struct dev_pm_ops shmob_drm_pm_ops = { 157 SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume) 158 RUNTIME_PM_OPS(shmob_drm_pm_runtime_suspend, 159 shmob_drm_pm_runtime_resume, NULL) 160 }; 161 162 /* ----------------------------------------------------------------------------- 163 * Platform driver 164 */ 165 166 static void shmob_drm_remove(struct platform_device *pdev) 167 { 168 struct shmob_drm_device *sdev = platform_get_drvdata(pdev); 169 struct drm_device *ddev = &sdev->ddev; 170 171 drm_dev_unregister(ddev); 172 drm_atomic_helper_shutdown(ddev); 173 drm_kms_helper_poll_fini(ddev); 174 } 175 176 static void shmob_drm_shutdown(struct platform_device *pdev) 177 { 178 struct shmob_drm_device *sdev = platform_get_drvdata(pdev); 179 180 drm_atomic_helper_shutdown(&sdev->ddev); 181 } 182 183 static int shmob_drm_probe(struct platform_device *pdev) 184 { 185 struct shmob_drm_platform_data *pdata = pdev->dev.platform_data; 186 const struct shmob_drm_config *config; 187 struct shmob_drm_device *sdev; 188 struct drm_device *ddev; 189 int ret; 190 191 config = of_device_get_match_data(&pdev->dev); 192 if (!config && !pdata) { 193 dev_err(&pdev->dev, "no platform data\n"); 194 return -EINVAL; 195 } 196 197 /* 198 * Allocate and initialize the DRM device, driver private data, I/O 199 * resources and clocks. 200 */ 201 sdev = devm_drm_dev_alloc(&pdev->dev, &shmob_drm_driver, 202 struct shmob_drm_device, ddev); 203 if (IS_ERR(sdev)) 204 return PTR_ERR(sdev); 205 206 ddev = &sdev->ddev; 207 sdev->dev = &pdev->dev; 208 if (config) { 209 sdev->config = *config; 210 } else { 211 sdev->pdata = pdata; 212 sdev->config.clk_source = pdata->clk_source; 213 sdev->config.clk_div = pdata->iface.clk_div; 214 } 215 spin_lock_init(&sdev->irq_lock); 216 217 platform_set_drvdata(pdev, sdev); 218 219 sdev->mmio = devm_platform_ioremap_resource(pdev, 0); 220 if (IS_ERR(sdev->mmio)) 221 return PTR_ERR(sdev->mmio); 222 223 ret = shmob_drm_setup_clocks(sdev, sdev->config.clk_source); 224 if (ret < 0) 225 return ret; 226 227 ret = devm_pm_runtime_enable(&pdev->dev); 228 if (ret) 229 return ret; 230 231 ret = drm_vblank_init(ddev, 1); 232 if (ret < 0) { 233 dev_err(&pdev->dev, "failed to initialize vblank\n"); 234 return ret; 235 } 236 237 ret = shmob_drm_modeset_init(sdev); 238 if (ret < 0) 239 return dev_err_probe(&pdev->dev, ret, 240 "failed to initialize mode setting\n"); 241 242 ret = platform_get_irq(pdev, 0); 243 if (ret < 0) 244 goto err_modeset_cleanup; 245 sdev->irq = ret; 246 247 ret = devm_request_irq(&pdev->dev, sdev->irq, shmob_drm_irq, 0, 248 ddev->driver->name, ddev); 249 if (ret < 0) { 250 dev_err(&pdev->dev, "failed to install IRQ handler\n"); 251 goto err_modeset_cleanup; 252 } 253 254 /* 255 * Register the DRM device with the core and the connectors with 256 * sysfs. 257 */ 258 ret = drm_dev_register(ddev, 0); 259 if (ret < 0) 260 goto err_modeset_cleanup; 261 262 drm_client_setup_with_fourcc(ddev, DRM_FORMAT_RGB565); 263 264 return 0; 265 266 err_modeset_cleanup: 267 drm_kms_helper_poll_fini(ddev); 268 return ret; 269 } 270 271 static const struct shmob_drm_config shmob_arm_config = { 272 .clk_source = SHMOB_DRM_CLK_BUS, 273 .clk_div = 5, 274 }; 275 276 static const struct of_device_id shmob_drm_of_table[] __maybe_unused = { 277 { .compatible = "renesas,r8a7740-lcdc", .data = &shmob_arm_config, }, 278 { .compatible = "renesas,sh73a0-lcdc", .data = &shmob_arm_config, }, 279 { /* sentinel */ } 280 }; 281 282 static struct platform_driver shmob_drm_platform_driver = { 283 .probe = shmob_drm_probe, 284 .remove = shmob_drm_remove, 285 .shutdown = shmob_drm_shutdown, 286 .driver = { 287 .name = "shmob-drm", 288 .of_match_table = of_match_ptr(shmob_drm_of_table), 289 .pm = &shmob_drm_pm_ops, 290 }, 291 }; 292 293 drm_module_platform_driver(shmob_drm_platform_driver); 294 295 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); 296 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver"); 297 MODULE_LICENSE("GPL"); 298