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/platform_device.h> 15 #include <linux/pm.h> 16 #include <linux/slab.h> 17 18 #include <drm/drm_drv.h> 19 #include <drm/drm_fbdev_generic.h> 20 #include <drm/drm_gem_dma_helper.h> 21 #include <drm/drm_module.h> 22 #include <drm/drm_probe_helper.h> 23 #include <drm/drm_vblank.h> 24 25 #include "shmob_drm_drv.h" 26 #include "shmob_drm_kms.h" 27 #include "shmob_drm_plane.h" 28 #include "shmob_drm_regs.h" 29 30 /* ----------------------------------------------------------------------------- 31 * Hardware initialization 32 */ 33 34 static int shmob_drm_init_interface(struct shmob_drm_device *sdev) 35 { 36 static const u32 ldmt1r[] = { 37 [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8, 38 [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9, 39 [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A, 40 [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B, 41 [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16, 42 [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18, 43 [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24, 44 [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR, 45 [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A, 46 [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B, 47 [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C, 48 [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D, 49 [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9, 50 [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12, 51 [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A, 52 [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B, 53 [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C, 54 [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18, 55 [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24, 56 }; 57 58 if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) { 59 dev_err(sdev->dev, "invalid interface type %u\n", 60 sdev->pdata->iface.interface); 61 return -EINVAL; 62 } 63 64 sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface]; 65 return 0; 66 } 67 68 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev, 69 enum shmob_drm_clk_source clksrc) 70 { 71 struct clk *clk; 72 char *clkname; 73 74 switch (clksrc) { 75 case SHMOB_DRM_CLK_BUS: 76 clkname = "bus_clk"; 77 sdev->lddckr = LDDCKR_ICKSEL_BUS; 78 break; 79 case SHMOB_DRM_CLK_PERIPHERAL: 80 clkname = "peripheral_clk"; 81 sdev->lddckr = LDDCKR_ICKSEL_MIPI; 82 break; 83 case SHMOB_DRM_CLK_EXTERNAL: 84 clkname = NULL; 85 sdev->lddckr = LDDCKR_ICKSEL_HDMI; 86 break; 87 default: 88 return -EINVAL; 89 } 90 91 clk = devm_clk_get(sdev->dev, clkname); 92 if (IS_ERR(clk)) { 93 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname); 94 return PTR_ERR(clk); 95 } 96 97 sdev->clock = clk; 98 return 0; 99 } 100 101 /* ----------------------------------------------------------------------------- 102 * DRM operations 103 */ 104 105 static irqreturn_t shmob_drm_irq(int irq, void *arg) 106 { 107 struct drm_device *dev = arg; 108 struct shmob_drm_device *sdev = dev->dev_private; 109 unsigned long flags; 110 u32 status; 111 112 /* Acknowledge interrupts. Putting interrupt enable and interrupt flag 113 * bits in the same register is really brain-dead design and requires 114 * taking a spinlock. 115 */ 116 spin_lock_irqsave(&sdev->irq_lock, flags); 117 status = lcdc_read(sdev, LDINTR); 118 lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK); 119 spin_unlock_irqrestore(&sdev->irq_lock, flags); 120 121 if (status & LDINTR_VES) { 122 drm_handle_vblank(dev, 0); 123 shmob_drm_crtc_finish_page_flip(&sdev->crtc); 124 } 125 126 return IRQ_HANDLED; 127 } 128 129 DEFINE_DRM_GEM_DMA_FOPS(shmob_drm_fops); 130 131 static const struct drm_driver shmob_drm_driver = { 132 .driver_features = DRIVER_GEM | DRIVER_MODESET, 133 DRM_GEM_DMA_DRIVER_OPS, 134 .fops = &shmob_drm_fops, 135 .name = "shmob-drm", 136 .desc = "Renesas SH Mobile DRM", 137 .date = "20120424", 138 .major = 1, 139 .minor = 0, 140 }; 141 142 /* ----------------------------------------------------------------------------- 143 * Power management 144 */ 145 146 static int shmob_drm_pm_suspend(struct device *dev) 147 { 148 struct shmob_drm_device *sdev = dev_get_drvdata(dev); 149 150 drm_kms_helper_poll_disable(sdev->ddev); 151 shmob_drm_crtc_suspend(&sdev->crtc); 152 153 return 0; 154 } 155 156 static int shmob_drm_pm_resume(struct device *dev) 157 { 158 struct shmob_drm_device *sdev = dev_get_drvdata(dev); 159 160 drm_modeset_lock_all(sdev->ddev); 161 shmob_drm_crtc_resume(&sdev->crtc); 162 drm_modeset_unlock_all(sdev->ddev); 163 164 drm_kms_helper_poll_enable(sdev->ddev); 165 return 0; 166 } 167 168 static DEFINE_SIMPLE_DEV_PM_OPS(shmob_drm_pm_ops, 169 shmob_drm_pm_suspend, shmob_drm_pm_resume); 170 171 /* ----------------------------------------------------------------------------- 172 * Platform driver 173 */ 174 175 static int shmob_drm_remove(struct platform_device *pdev) 176 { 177 struct shmob_drm_device *sdev = platform_get_drvdata(pdev); 178 struct drm_device *ddev = sdev->ddev; 179 180 drm_dev_unregister(ddev); 181 drm_kms_helper_poll_fini(ddev); 182 free_irq(sdev->irq, ddev); 183 drm_dev_put(ddev); 184 185 return 0; 186 } 187 188 static int shmob_drm_probe(struct platform_device *pdev) 189 { 190 struct shmob_drm_platform_data *pdata = pdev->dev.platform_data; 191 struct shmob_drm_device *sdev; 192 struct drm_device *ddev; 193 unsigned int i; 194 int ret; 195 196 if (pdata == NULL) { 197 dev_err(&pdev->dev, "no platform data\n"); 198 return -EINVAL; 199 } 200 201 /* 202 * Allocate and initialize the driver private data, I/O resources and 203 * clocks. 204 */ 205 sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL); 206 if (sdev == NULL) 207 return -ENOMEM; 208 209 sdev->dev = &pdev->dev; 210 sdev->pdata = pdata; 211 spin_lock_init(&sdev->irq_lock); 212 213 platform_set_drvdata(pdev, sdev); 214 215 sdev->mmio = devm_platform_ioremap_resource(pdev, 0); 216 if (IS_ERR(sdev->mmio)) 217 return PTR_ERR(sdev->mmio); 218 219 ret = shmob_drm_setup_clocks(sdev, pdata->clk_source); 220 if (ret < 0) 221 return ret; 222 223 ret = shmob_drm_init_interface(sdev); 224 if (ret < 0) 225 return ret; 226 227 /* Allocate and initialize the DRM device. */ 228 ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev); 229 if (IS_ERR(ddev)) 230 return PTR_ERR(ddev); 231 232 sdev->ddev = ddev; 233 ddev->dev_private = sdev; 234 235 ret = shmob_drm_modeset_init(sdev); 236 if (ret < 0) { 237 dev_err(&pdev->dev, "failed to initialize mode setting\n"); 238 goto err_free_drm_dev; 239 } 240 241 for (i = 0; i < 4; ++i) { 242 ret = shmob_drm_plane_create(sdev, i); 243 if (ret < 0) { 244 dev_err(&pdev->dev, "failed to create plane %u\n", i); 245 goto err_modeset_cleanup; 246 } 247 } 248 249 ret = drm_vblank_init(ddev, 1); 250 if (ret < 0) { 251 dev_err(&pdev->dev, "failed to initialize vblank\n"); 252 goto err_modeset_cleanup; 253 } 254 255 ret = platform_get_irq(pdev, 0); 256 if (ret < 0) 257 goto err_modeset_cleanup; 258 sdev->irq = ret; 259 260 ret = request_irq(sdev->irq, shmob_drm_irq, 0, ddev->driver->name, 261 ddev); 262 if (ret < 0) { 263 dev_err(&pdev->dev, "failed to install IRQ handler\n"); 264 goto err_modeset_cleanup; 265 } 266 267 /* 268 * Register the DRM device with the core and the connectors with 269 * sysfs. 270 */ 271 ret = drm_dev_register(ddev, 0); 272 if (ret < 0) 273 goto err_irq_uninstall; 274 275 drm_fbdev_generic_setup(ddev, 16); 276 277 return 0; 278 279 err_irq_uninstall: 280 free_irq(sdev->irq, ddev); 281 err_modeset_cleanup: 282 drm_kms_helper_poll_fini(ddev); 283 err_free_drm_dev: 284 drm_dev_put(ddev); 285 286 return ret; 287 } 288 289 static struct platform_driver shmob_drm_platform_driver = { 290 .probe = shmob_drm_probe, 291 .remove = shmob_drm_remove, 292 .driver = { 293 .name = "shmob-drm", 294 .pm = pm_sleep_ptr(&shmob_drm_pm_ops), 295 }, 296 }; 297 298 drm_module_platform_driver(shmob_drm_platform_driver); 299 300 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); 301 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver"); 302 MODULE_LICENSE("GPL"); 303