shmob_drm_drv.c (7619B)
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_crtc_helper.h> 19#include <drm/drm_drv.h> 20#include <drm/drm_gem_cma_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 34static 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 68static 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 105static 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 129DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops); 130 131static const struct drm_driver shmob_drm_driver = { 132 .driver_features = DRIVER_GEM | DRIVER_MODESET, 133 DRM_GEM_CMA_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#ifdef CONFIG_PM_SLEEP 147static int shmob_drm_pm_suspend(struct device *dev) 148{ 149 struct shmob_drm_device *sdev = dev_get_drvdata(dev); 150 151 drm_kms_helper_poll_disable(sdev->ddev); 152 shmob_drm_crtc_suspend(&sdev->crtc); 153 154 return 0; 155} 156 157static int shmob_drm_pm_resume(struct device *dev) 158{ 159 struct shmob_drm_device *sdev = dev_get_drvdata(dev); 160 161 drm_modeset_lock_all(sdev->ddev); 162 shmob_drm_crtc_resume(&sdev->crtc); 163 drm_modeset_unlock_all(sdev->ddev); 164 165 drm_kms_helper_poll_enable(sdev->ddev); 166 return 0; 167} 168#endif 169 170static const struct dev_pm_ops shmob_drm_pm_ops = { 171 SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume) 172}; 173 174/* ----------------------------------------------------------------------------- 175 * Platform driver 176 */ 177 178static int shmob_drm_remove(struct platform_device *pdev) 179{ 180 struct shmob_drm_device *sdev = platform_get_drvdata(pdev); 181 struct drm_device *ddev = sdev->ddev; 182 183 drm_dev_unregister(ddev); 184 drm_kms_helper_poll_fini(ddev); 185 free_irq(sdev->irq, ddev); 186 drm_dev_put(ddev); 187 188 return 0; 189} 190 191static int shmob_drm_probe(struct platform_device *pdev) 192{ 193 struct shmob_drm_platform_data *pdata = pdev->dev.platform_data; 194 struct shmob_drm_device *sdev; 195 struct drm_device *ddev; 196 unsigned int i; 197 int ret; 198 199 if (pdata == NULL) { 200 dev_err(&pdev->dev, "no platform data\n"); 201 return -EINVAL; 202 } 203 204 /* 205 * Allocate and initialize the driver private data, I/O resources and 206 * clocks. 207 */ 208 sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL); 209 if (sdev == NULL) 210 return -ENOMEM; 211 212 sdev->dev = &pdev->dev; 213 sdev->pdata = pdata; 214 spin_lock_init(&sdev->irq_lock); 215 216 platform_set_drvdata(pdev, sdev); 217 218 sdev->mmio = devm_platform_ioremap_resource(pdev, 0); 219 if (IS_ERR(sdev->mmio)) 220 return PTR_ERR(sdev->mmio); 221 222 ret = shmob_drm_setup_clocks(sdev, pdata->clk_source); 223 if (ret < 0) 224 return ret; 225 226 ret = shmob_drm_init_interface(sdev); 227 if (ret < 0) 228 return ret; 229 230 /* Allocate and initialize the DRM device. */ 231 ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev); 232 if (IS_ERR(ddev)) 233 return PTR_ERR(ddev); 234 235 sdev->ddev = ddev; 236 ddev->dev_private = sdev; 237 238 ret = shmob_drm_modeset_init(sdev); 239 if (ret < 0) { 240 dev_err(&pdev->dev, "failed to initialize mode setting\n"); 241 goto err_free_drm_dev; 242 } 243 244 for (i = 0; i < 4; ++i) { 245 ret = shmob_drm_plane_create(sdev, i); 246 if (ret < 0) { 247 dev_err(&pdev->dev, "failed to create plane %u\n", i); 248 goto err_modeset_cleanup; 249 } 250 } 251 252 ret = drm_vblank_init(ddev, 1); 253 if (ret < 0) { 254 dev_err(&pdev->dev, "failed to initialize vblank\n"); 255 goto err_modeset_cleanup; 256 } 257 258 ret = platform_get_irq(pdev, 0); 259 if (ret < 0) 260 goto err_modeset_cleanup; 261 sdev->irq = ret; 262 263 ret = request_irq(sdev->irq, shmob_drm_irq, 0, ddev->driver->name, 264 ddev); 265 if (ret < 0) { 266 dev_err(&pdev->dev, "failed to install IRQ handler\n"); 267 goto err_modeset_cleanup; 268 } 269 270 /* 271 * Register the DRM device with the core and the connectors with 272 * sysfs. 273 */ 274 ret = drm_dev_register(ddev, 0); 275 if (ret < 0) 276 goto err_irq_uninstall; 277 278 return 0; 279 280err_irq_uninstall: 281 free_irq(sdev->irq, ddev); 282err_modeset_cleanup: 283 drm_kms_helper_poll_fini(ddev); 284err_free_drm_dev: 285 drm_dev_put(ddev); 286 287 return ret; 288} 289 290static struct platform_driver shmob_drm_platform_driver = { 291 .probe = shmob_drm_probe, 292 .remove = shmob_drm_remove, 293 .driver = { 294 .name = "shmob-drm", 295 .pm = &shmob_drm_pm_ops, 296 }, 297}; 298 299drm_module_platform_driver(shmob_drm_platform_driver); 300 301MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); 302MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver"); 303MODULE_LICENSE("GPL");