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0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * shmob_drm_drv.c  --  SH Mobile DRM driver
0004  *
0005  * Copyright (C) 2012 Renesas Electronics Corporation
0006  *
0007  * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
0008  */
0009 
0010 #include <linux/clk.h>
0011 #include <linux/io.h>
0012 #include <linux/mm.h>
0013 #include <linux/module.h>
0014 #include <linux/platform_device.h>
0015 #include <linux/pm.h>
0016 #include <linux/slab.h>
0017 
0018 #include <drm/drm_crtc_helper.h>
0019 #include <drm/drm_drv.h>
0020 #include <drm/drm_gem_cma_helper.h>
0021 #include <drm/drm_module.h>
0022 #include <drm/drm_probe_helper.h>
0023 #include <drm/drm_vblank.h>
0024 
0025 #include "shmob_drm_drv.h"
0026 #include "shmob_drm_kms.h"
0027 #include "shmob_drm_plane.h"
0028 #include "shmob_drm_regs.h"
0029 
0030 /* -----------------------------------------------------------------------------
0031  * Hardware initialization
0032  */
0033 
0034 static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
0035 {
0036     static const u32 ldmt1r[] = {
0037         [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
0038         [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
0039         [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
0040         [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
0041         [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
0042         [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
0043         [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
0044         [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
0045         [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
0046         [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
0047         [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
0048         [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
0049         [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
0050         [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
0051         [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
0052         [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
0053         [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
0054         [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
0055         [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
0056     };
0057 
0058     if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
0059         dev_err(sdev->dev, "invalid interface type %u\n",
0060             sdev->pdata->iface.interface);
0061         return -EINVAL;
0062     }
0063 
0064     sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
0065     return 0;
0066 }
0067 
0068 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
0069                         enum shmob_drm_clk_source clksrc)
0070 {
0071     struct clk *clk;
0072     char *clkname;
0073 
0074     switch (clksrc) {
0075     case SHMOB_DRM_CLK_BUS:
0076         clkname = "bus_clk";
0077         sdev->lddckr = LDDCKR_ICKSEL_BUS;
0078         break;
0079     case SHMOB_DRM_CLK_PERIPHERAL:
0080         clkname = "peripheral_clk";
0081         sdev->lddckr = LDDCKR_ICKSEL_MIPI;
0082         break;
0083     case SHMOB_DRM_CLK_EXTERNAL:
0084         clkname = NULL;
0085         sdev->lddckr = LDDCKR_ICKSEL_HDMI;
0086         break;
0087     default:
0088         return -EINVAL;
0089     }
0090 
0091     clk = devm_clk_get(sdev->dev, clkname);
0092     if (IS_ERR(clk)) {
0093         dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
0094         return PTR_ERR(clk);
0095     }
0096 
0097     sdev->clock = clk;
0098     return 0;
0099 }
0100 
0101 /* -----------------------------------------------------------------------------
0102  * DRM operations
0103  */
0104 
0105 static irqreturn_t shmob_drm_irq(int irq, void *arg)
0106 {
0107     struct drm_device *dev = arg;
0108     struct shmob_drm_device *sdev = dev->dev_private;
0109     unsigned long flags;
0110     u32 status;
0111 
0112     /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
0113      * bits in the same register is really brain-dead design and requires
0114      * taking a spinlock.
0115      */
0116     spin_lock_irqsave(&sdev->irq_lock, flags);
0117     status = lcdc_read(sdev, LDINTR);
0118     lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
0119     spin_unlock_irqrestore(&sdev->irq_lock, flags);
0120 
0121     if (status & LDINTR_VES) {
0122         drm_handle_vblank(dev, 0);
0123         shmob_drm_crtc_finish_page_flip(&sdev->crtc);
0124     }
0125 
0126     return IRQ_HANDLED;
0127 }
0128 
0129 DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops);
0130 
0131 static const struct drm_driver shmob_drm_driver = {
0132     .driver_features    = DRIVER_GEM | DRIVER_MODESET,
0133     DRM_GEM_CMA_DRIVER_OPS,
0134     .fops           = &shmob_drm_fops,
0135     .name           = "shmob-drm",
0136     .desc           = "Renesas SH Mobile DRM",
0137     .date           = "20120424",
0138     .major          = 1,
0139     .minor          = 0,
0140 };
0141 
0142 /* -----------------------------------------------------------------------------
0143  * Power management
0144  */
0145 
0146 #ifdef CONFIG_PM_SLEEP
0147 static int shmob_drm_pm_suspend(struct device *dev)
0148 {
0149     struct shmob_drm_device *sdev = dev_get_drvdata(dev);
0150 
0151     drm_kms_helper_poll_disable(sdev->ddev);
0152     shmob_drm_crtc_suspend(&sdev->crtc);
0153 
0154     return 0;
0155 }
0156 
0157 static int shmob_drm_pm_resume(struct device *dev)
0158 {
0159     struct shmob_drm_device *sdev = dev_get_drvdata(dev);
0160 
0161     drm_modeset_lock_all(sdev->ddev);
0162     shmob_drm_crtc_resume(&sdev->crtc);
0163     drm_modeset_unlock_all(sdev->ddev);
0164 
0165     drm_kms_helper_poll_enable(sdev->ddev);
0166     return 0;
0167 }
0168 #endif
0169 
0170 static const struct dev_pm_ops shmob_drm_pm_ops = {
0171     SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
0172 };
0173 
0174 /* -----------------------------------------------------------------------------
0175  * Platform driver
0176  */
0177 
0178 static int shmob_drm_remove(struct platform_device *pdev)
0179 {
0180     struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
0181     struct drm_device *ddev = sdev->ddev;
0182 
0183     drm_dev_unregister(ddev);
0184     drm_kms_helper_poll_fini(ddev);
0185     free_irq(sdev->irq, ddev);
0186     drm_dev_put(ddev);
0187 
0188     return 0;
0189 }
0190 
0191 static int shmob_drm_probe(struct platform_device *pdev)
0192 {
0193     struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
0194     struct shmob_drm_device *sdev;
0195     struct drm_device *ddev;
0196     unsigned int i;
0197     int ret;
0198 
0199     if (pdata == NULL) {
0200         dev_err(&pdev->dev, "no platform data\n");
0201         return -EINVAL;
0202     }
0203 
0204     /*
0205      * Allocate and initialize the driver private data, I/O resources and
0206      * clocks.
0207      */
0208     sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
0209     if (sdev == NULL)
0210         return -ENOMEM;
0211 
0212     sdev->dev = &pdev->dev;
0213     sdev->pdata = pdata;
0214     spin_lock_init(&sdev->irq_lock);
0215 
0216     platform_set_drvdata(pdev, sdev);
0217 
0218     sdev->mmio = devm_platform_ioremap_resource(pdev, 0);
0219     if (IS_ERR(sdev->mmio))
0220         return PTR_ERR(sdev->mmio);
0221 
0222     ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
0223     if (ret < 0)
0224         return ret;
0225 
0226     ret = shmob_drm_init_interface(sdev);
0227     if (ret < 0)
0228         return ret;
0229 
0230     /* Allocate and initialize the DRM device. */
0231     ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev);
0232     if (IS_ERR(ddev))
0233         return PTR_ERR(ddev);
0234 
0235     sdev->ddev = ddev;
0236     ddev->dev_private = sdev;
0237 
0238     ret = shmob_drm_modeset_init(sdev);
0239     if (ret < 0) {
0240         dev_err(&pdev->dev, "failed to initialize mode setting\n");
0241         goto err_free_drm_dev;
0242     }
0243 
0244     for (i = 0; i < 4; ++i) {
0245         ret = shmob_drm_plane_create(sdev, i);
0246         if (ret < 0) {
0247             dev_err(&pdev->dev, "failed to create plane %u\n", i);
0248             goto err_modeset_cleanup;
0249         }
0250     }
0251 
0252     ret = drm_vblank_init(ddev, 1);
0253     if (ret < 0) {
0254         dev_err(&pdev->dev, "failed to initialize vblank\n");
0255         goto err_modeset_cleanup;
0256     }
0257 
0258     ret = platform_get_irq(pdev, 0);
0259     if (ret < 0)
0260         goto err_modeset_cleanup;
0261     sdev->irq = ret;
0262 
0263     ret = request_irq(sdev->irq, shmob_drm_irq, 0, ddev->driver->name,
0264               ddev);
0265     if (ret < 0) {
0266         dev_err(&pdev->dev, "failed to install IRQ handler\n");
0267         goto err_modeset_cleanup;
0268     }
0269 
0270     /*
0271      * Register the DRM device with the core and the connectors with
0272      * sysfs.
0273      */
0274     ret = drm_dev_register(ddev, 0);
0275     if (ret < 0)
0276         goto err_irq_uninstall;
0277 
0278     return 0;
0279 
0280 err_irq_uninstall:
0281     free_irq(sdev->irq, ddev);
0282 err_modeset_cleanup:
0283     drm_kms_helper_poll_fini(ddev);
0284 err_free_drm_dev:
0285     drm_dev_put(ddev);
0286 
0287     return ret;
0288 }
0289 
0290 static struct platform_driver shmob_drm_platform_driver = {
0291     .probe      = shmob_drm_probe,
0292     .remove     = shmob_drm_remove,
0293     .driver     = {
0294         .name   = "shmob-drm",
0295         .pm = &shmob_drm_pm_ops,
0296     },
0297 };
0298 
0299 drm_module_platform_driver(shmob_drm_platform_driver);
0300 
0301 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
0302 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
0303 MODULE_LICENSE("GPL");