drm/fsl-dcu/fsl_dcu_drm_drv.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright 2015 Freescale Semiconductor, Inc.
0004  *
0005  * Freescale DCU drm device driver
0006  */
0007
0008 #include <linux/clk.h>
0009 #include <linux/clk-provider.h>
0010 #include <linux/console.h>
0011 #include <linux/io.h>
0012 #include <linux/mfd/syscon.h>
0013 #include <linux/mm.h>
0014 #include <linux/module.h>
0015 #include <linux/of_platform.h>
0016 #include <linux/platform_device.h>
0017 #include <linux/pm.h>
0018 #include <linux/pm_runtime.h>
0019 #include <linux/regmap.h>
0020
0021 #include <drm/drm_atomic_helper.h>
0022 #include <drm/drm_drv.h>
0023 #include <drm/drm_fb_cma_helper.h>
0024 #include <drm/drm_fb_helper.h>
0025 #include <drm/drm_gem_cma_helper.h>
0026 #include <drm/drm_modeset_helper.h>
0027 #include <drm/drm_module.h>
0028 #include <drm/drm_probe_helper.h>
0029 #include <drm/drm_vblank.h>
0030
0031 #include "fsl_dcu_drm_crtc.h"
0032 #include "fsl_dcu_drm_drv.h"
0033 #include "fsl_tcon.h"
0034
0035 static int legacyfb_depth = 24;
0036 module_param(legacyfb_depth, int, 0444);
0037
0038 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
0039 {
0040     if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
0041         return true;
0042
0043     return false;
0044 }
0045
0046 static const struct regmap_config fsl_dcu_regmap_config = {
0047     .reg_bits = 32,
0048     .reg_stride = 4,
0049     .val_bits = 32,
0050
0051     .volatile_reg = fsl_dcu_drm_is_volatile_reg,
0052 };
0053
0054 static void fsl_dcu_irq_reset(struct drm_device *dev)
0055 {
0056     struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
0057
0058     regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
0059     regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
0060 }
0061
0062 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
0063 {
0064     struct drm_device *dev = arg;
0065     struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
0066     unsigned int int_status;
0067     int ret;
0068
0069     ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
0070     if (ret) {
0071         dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
0072         return IRQ_NONE;
0073     }
0074
0075     if (int_status & DCU_INT_STATUS_VBLANK)
0076         drm_handle_vblank(dev, 0);
0077
0078     regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
0079
0080     return IRQ_HANDLED;
0081 }
0082
0083 static int fsl_dcu_irq_install(struct drm_device *dev, unsigned int irq)
0084 {
0085     if (irq == IRQ_NOTCONNECTED)
0086         return -ENOTCONN;
0087
0088     fsl_dcu_irq_reset(dev);
0089
0090     return request_irq(irq, fsl_dcu_drm_irq, 0, dev->driver->name, dev);
0091 }
0092
0093 static void fsl_dcu_irq_uninstall(struct drm_device *dev)
0094 {
0095     struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
0096
0097     fsl_dcu_irq_reset(dev);
0098     free_irq(fsl_dev->irq, dev);
0099 }
0100
0101 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
0102 {
0103     struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
0104     int ret;
0105
0106     ret = fsl_dcu_drm_modeset_init(fsl_dev);
0107     if (ret < 0) {
0108         dev_err(dev->dev, "failed to initialize mode setting\n");
0109         return ret;
0110     }
0111
0112     ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
0113     if (ret < 0) {
0114         dev_err(dev->dev, "failed to initialize vblank\n");
0115         goto done_vblank;
0116     }
0117
0118     ret = fsl_dcu_irq_install(dev, fsl_dev->irq);
0119     if (ret < 0) {
0120         dev_err(dev->dev, "failed to install IRQ handler\n");
0121         goto done_irq;
0122     }
0123
0124     if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
0125         legacyfb_depth != 32) {
0126         dev_warn(dev->dev,
0127             "Invalid legacyfb_depth.  Defaulting to 24bpp\n");
0128         legacyfb_depth = 24;
0129     }
0130
0131     return 0;
0132 done_irq:
0133     drm_kms_helper_poll_fini(dev);
0134
0135     drm_mode_config_cleanup(dev);
0136 done_vblank:
0137     dev->dev_private = NULL;
0138
0139     return ret;
0140 }
0141
0142 static void fsl_dcu_unload(struct drm_device *dev)
0143 {
0144     drm_atomic_helper_shutdown(dev);
0145     drm_kms_helper_poll_fini(dev);
0146
0147     drm_mode_config_cleanup(dev);
0148     fsl_dcu_irq_uninstall(dev);
0149
0150     dev->dev_private = NULL;
0151 }
0152
0153 DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
0154
0155 static const struct drm_driver fsl_dcu_drm_driver = {
0156     .driver_features    = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
0157     .load           = fsl_dcu_load,
0158     .unload         = fsl_dcu_unload,
0159     DRM_GEM_CMA_DRIVER_OPS,
0160     .fops           = &fsl_dcu_drm_fops,
0161     .name           = "fsl-dcu-drm",
0162     .desc           = "Freescale DCU DRM",
0163     .date           = "20160425",
0164     .major          = 1,
0165     .minor          = 1,
0166 };
0167
0168 #ifdef CONFIG_PM_SLEEP
0169 static int fsl_dcu_drm_pm_suspend(struct device *dev)
0170 {
0171     struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
0172     int ret;
0173
0174     if (!fsl_dev)
0175         return 0;
0176
0177     disable_irq(fsl_dev->irq);
0178
0179     ret = drm_mode_config_helper_suspend(fsl_dev->drm);
0180     if (ret) {
0181         enable_irq(fsl_dev->irq);
0182         return ret;
0183     }
0184
0185     clk_disable_unprepare(fsl_dev->clk);
0186
0187     return 0;
0188 }
0189
0190 static int fsl_dcu_drm_pm_resume(struct device *dev)
0191 {
0192     struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
0193     int ret;
0194
0195     if (!fsl_dev)
0196         return 0;
0197
0198     ret = clk_prepare_enable(fsl_dev->clk);
0199     if (ret < 0) {
0200         dev_err(dev, "failed to enable dcu clk\n");
0201         return ret;
0202     }
0203
0204     if (fsl_dev->tcon)
0205         fsl_tcon_bypass_enable(fsl_dev->tcon);
0206     fsl_dcu_drm_init_planes(fsl_dev->drm);
0207     enable_irq(fsl_dev->irq);
0208
0209     drm_mode_config_helper_resume(fsl_dev->drm);
0210
0211     return 0;
0212 }
0213 #endif
0214
0215 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
0216     SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
0217 };
0218
0219 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
0220     .name = "ls1021a",
0221     .total_layer = 16,
0222     .max_layer = 4,
0223     .layer_regs = LS1021A_LAYER_REG_NUM,
0224 };
0225
0226 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
0227     .name = "vf610",
0228     .total_layer = 64,
0229     .max_layer = 6,
0230     .layer_regs = VF610_LAYER_REG_NUM,
0231 };
0232
0233 static const struct of_device_id fsl_dcu_of_match[] = {
0234     {
0235         .compatible = "fsl,ls1021a-dcu",
0236         .data = &fsl_dcu_ls1021a_data,
0237     }, {
0238         .compatible = "fsl,vf610-dcu",
0239         .data = &fsl_dcu_vf610_data,
0240     }, {
0241     },
0242 };
0243 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
0244
0245 static int fsl_dcu_drm_probe(struct platform_device *pdev)
0246 {
0247     struct fsl_dcu_drm_device *fsl_dev;
0248     struct drm_device *drm;
0249     struct device *dev = &pdev->dev;
0250     struct resource *res;
0251     void __iomem *base;
0252     struct clk *pix_clk_in;
0253     char pix_clk_name[32];
0254     const char *pix_clk_in_name;
0255     const struct of_device_id *id;
0256     int ret;
0257     u8 div_ratio_shift = 0;
0258
0259     fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
0260     if (!fsl_dev)
0261         return -ENOMEM;
0262
0263     id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
0264     if (!id)
0265         return -ENODEV;
0266     fsl_dev->soc = id->data;
0267
0268     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0269     base = devm_ioremap_resource(dev, res);
0270     if (IS_ERR(base)) {
0271         ret = PTR_ERR(base);
0272         return ret;
0273     }
0274
0275     fsl_dev->irq = platform_get_irq(pdev, 0);
0276     if (fsl_dev->irq < 0) {
0277         dev_err(dev, "failed to get irq\n");
0278         return fsl_dev->irq;
0279     }
0280
0281     fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
0282             &fsl_dcu_regmap_config);
0283     if (IS_ERR(fsl_dev->regmap)) {
0284         dev_err(dev, "regmap init failed\n");
0285         return PTR_ERR(fsl_dev->regmap);
0286     }
0287
0288     fsl_dev->clk = devm_clk_get(dev, "dcu");
0289     if (IS_ERR(fsl_dev->clk)) {
0290         dev_err(dev, "failed to get dcu clock\n");
0291         return PTR_ERR(fsl_dev->clk);
0292     }
0293     ret = clk_prepare_enable(fsl_dev->clk);
0294     if (ret < 0) {
0295         dev_err(dev, "failed to enable dcu clk\n");
0296         return ret;
0297     }
0298
0299     pix_clk_in = devm_clk_get(dev, "pix");
0300     if (IS_ERR(pix_clk_in)) {
0301         /* legancy binding, use dcu clock as pixel clock input */
0302         pix_clk_in = fsl_dev->clk;
0303     }
0304
0305     if (of_property_read_bool(dev->of_node, "big-endian"))
0306         div_ratio_shift = 24;
0307
0308     pix_clk_in_name = __clk_get_name(pix_clk_in);
0309     snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
0310     fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
0311             pix_clk_in_name, 0, base + DCU_DIV_RATIO,
0312             div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
0313     if (IS_ERR(fsl_dev->pix_clk)) {
0314         dev_err(dev, "failed to register pix clk\n");
0315         ret = PTR_ERR(fsl_dev->pix_clk);
0316         goto disable_clk;
0317     }
0318
0319     fsl_dev->tcon = fsl_tcon_init(dev);
0320
0321     drm = drm_dev_alloc(&fsl_dcu_drm_driver, dev);
0322     if (IS_ERR(drm)) {
0323         ret = PTR_ERR(drm);
0324         goto unregister_pix_clk;
0325     }
0326
0327     fsl_dev->dev = dev;
0328     fsl_dev->drm = drm;
0329     fsl_dev->np = dev->of_node;
0330     drm->dev_private = fsl_dev;
0331     dev_set_drvdata(dev, fsl_dev);
0332
0333     ret = drm_dev_register(drm, 0);
0334     if (ret < 0)
0335         goto put;
0336
0337     drm_fbdev_generic_setup(drm, legacyfb_depth);
0338
0339     return 0;
0340
0341 put:
0342     drm_dev_put(drm);
0343 unregister_pix_clk:
0344     clk_unregister(fsl_dev->pix_clk);
0345 disable_clk:
0346     clk_disable_unprepare(fsl_dev->clk);
0347     return ret;
0348 }
0349
0350 static int fsl_dcu_drm_remove(struct platform_device *pdev)
0351 {
0352     struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
0353
0354     drm_dev_unregister(fsl_dev->drm);
0355     drm_dev_put(fsl_dev->drm);
0356     clk_disable_unprepare(fsl_dev->clk);
0357     clk_unregister(fsl_dev->pix_clk);
0358
0359     return 0;
0360 }
0361
0362 static struct platform_driver fsl_dcu_drm_platform_driver = {
0363     .probe      = fsl_dcu_drm_probe,
0364     .remove     = fsl_dcu_drm_remove,
0365     .driver     = {
0366         .name   = "fsl-dcu",
0367         .pm = &fsl_dcu_drm_pm_ops,
0368         .of_match_table = fsl_dcu_of_match,
0369     },
0370 };
0371
0372 drm_module_platform_driver(fsl_dcu_drm_platform_driver);
0373
0374 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
0375 MODULE_LICENSE("GPL");