summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/tilcdc/tilcdc_drv.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--drivers/gpu/drm/tilcdc/tilcdc_drv.c595
1 files changed, 595 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
new file mode 100644
index 000000000..4f5fc3e87
--- /dev/null
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -0,0 +1,595 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Texas Instruments
+ * Author: Rob Clark <robdclark@gmail.com>
+ */
+
+/* LCDC DRM driver, based on da8xx-fb */
+
+#include <linux/component.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_debugfs.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_irq.h>
+#include <drm/drm_mm.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+
+#include "tilcdc_drv.h"
+#include "tilcdc_external.h"
+#include "tilcdc_panel.h"
+#include "tilcdc_regs.h"
+
+static LIST_HEAD(module_list);
+
+static const u32 tilcdc_rev1_formats[] = { DRM_FORMAT_RGB565 };
+
+static const u32 tilcdc_straight_formats[] = { DRM_FORMAT_RGB565,
+ DRM_FORMAT_BGR888,
+ DRM_FORMAT_XBGR8888 };
+
+static const u32 tilcdc_crossed_formats[] = { DRM_FORMAT_BGR565,
+ DRM_FORMAT_RGB888,
+ DRM_FORMAT_XRGB8888 };
+
+static const u32 tilcdc_legacy_formats[] = { DRM_FORMAT_RGB565,
+ DRM_FORMAT_RGB888,
+ DRM_FORMAT_XRGB8888 };
+
+void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
+ const struct tilcdc_module_ops *funcs)
+{
+ mod->name = name;
+ mod->funcs = funcs;
+ INIT_LIST_HEAD(&mod->list);
+ list_add(&mod->list, &module_list);
+}
+
+void tilcdc_module_cleanup(struct tilcdc_module *mod)
+{
+ list_del(&mod->list);
+}
+
+static struct of_device_id tilcdc_of_match[];
+
+static int tilcdc_atomic_check(struct drm_device *dev,
+ struct drm_atomic_state *state)
+{
+ int ret;
+
+ ret = drm_atomic_helper_check_modeset(dev, state);
+ if (ret)
+ return ret;
+
+ ret = drm_atomic_helper_check_planes(dev, state);
+ if (ret)
+ return ret;
+
+ /*
+ * tilcdc ->atomic_check can update ->mode_changed if pixel format
+ * changes, hence will we check modeset changes again.
+ */
+ ret = drm_atomic_helper_check_modeset(dev, state);
+ if (ret)
+ return ret;
+
+ return ret;
+}
+
+static const struct drm_mode_config_funcs mode_config_funcs = {
+ .fb_create = drm_gem_fb_create,
+ .atomic_check = tilcdc_atomic_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static void modeset_init(struct drm_device *dev)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+ struct tilcdc_module *mod;
+
+ list_for_each_entry(mod, &module_list, list) {
+ DBG("loading module: %s", mod->name);
+ mod->funcs->modeset_init(mod, dev);
+ }
+
+ dev->mode_config.min_width = 0;
+ dev->mode_config.min_height = 0;
+ dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
+ dev->mode_config.max_height = 2048;
+ dev->mode_config.funcs = &mode_config_funcs;
+}
+
+#ifdef CONFIG_CPU_FREQ
+static int cpufreq_transition(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ struct tilcdc_drm_private *priv = container_of(nb,
+ struct tilcdc_drm_private, freq_transition);
+
+ if (val == CPUFREQ_POSTCHANGE)
+ tilcdc_crtc_update_clk(priv->crtc);
+
+ return 0;
+}
+#endif
+
+/*
+ * DRM operations:
+ */
+
+static void tilcdc_fini(struct drm_device *dev)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+
+#ifdef CONFIG_CPU_FREQ
+ if (priv->freq_transition.notifier_call)
+ cpufreq_unregister_notifier(&priv->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+#endif
+
+ if (priv->crtc)
+ tilcdc_crtc_shutdown(priv->crtc);
+
+ if (priv->is_registered)
+ drm_dev_unregister(dev);
+
+ drm_kms_helper_poll_fini(dev);
+ drm_irq_uninstall(dev);
+ drm_mode_config_cleanup(dev);
+
+ if (priv->clk)
+ clk_put(priv->clk);
+
+ if (priv->mmio)
+ iounmap(priv->mmio);
+
+ if (priv->wq) {
+ flush_workqueue(priv->wq);
+ destroy_workqueue(priv->wq);
+ }
+
+ dev->dev_private = NULL;
+
+ pm_runtime_disable(dev->dev);
+
+ drm_dev_put(dev);
+}
+
+static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
+{
+ struct drm_device *ddev;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct device_node *node = dev->of_node;
+ struct tilcdc_drm_private *priv;
+ struct resource *res;
+ u32 bpp = 0;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ ddev = drm_dev_alloc(ddrv, dev);
+ if (IS_ERR(ddev))
+ return PTR_ERR(ddev);
+
+ ddev->dev_private = priv;
+ platform_set_drvdata(pdev, ddev);
+ drm_mode_config_init(ddev);
+
+ priv->is_componentized =
+ tilcdc_get_external_components(dev, NULL) > 0;
+
+ priv->wq = alloc_ordered_workqueue("tilcdc", 0);
+ if (!priv->wq) {
+ ret = -ENOMEM;
+ goto init_failed;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "failed to get memory resource\n");
+ ret = -EINVAL;
+ goto init_failed;
+ }
+
+ priv->mmio = ioremap(res->start, resource_size(res));
+ if (!priv->mmio) {
+ dev_err(dev, "failed to ioremap\n");
+ ret = -ENOMEM;
+ goto init_failed;
+ }
+
+ priv->clk = clk_get(dev, "fck");
+ if (IS_ERR(priv->clk)) {
+ dev_err(dev, "failed to get functional clock\n");
+ ret = -ENODEV;
+ goto init_failed;
+ }
+
+ if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
+ priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
+
+ DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
+
+ if (of_property_read_u32(node, "max-width", &priv->max_width))
+ priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
+
+ DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
+
+ if (of_property_read_u32(node, "max-pixelclock",
+ &priv->max_pixelclock))
+ priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
+
+ DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
+
+ pm_runtime_enable(dev);
+
+ /* Determine LCD IP Version */
+ pm_runtime_get_sync(dev);
+ switch (tilcdc_read(ddev, LCDC_PID_REG)) {
+ case 0x4c100102:
+ priv->rev = 1;
+ break;
+ case 0x4f200800:
+ case 0x4f201000:
+ priv->rev = 2;
+ break;
+ default:
+ dev_warn(dev, "Unknown PID Reg value 0x%08x, "
+ "defaulting to LCD revision 1\n",
+ tilcdc_read(ddev, LCDC_PID_REG));
+ priv->rev = 1;
+ break;
+ }
+
+ pm_runtime_put_sync(dev);
+
+ if (priv->rev == 1) {
+ DBG("Revision 1 LCDC supports only RGB565 format");
+ priv->pixelformats = tilcdc_rev1_formats;
+ priv->num_pixelformats = ARRAY_SIZE(tilcdc_rev1_formats);
+ bpp = 16;
+ } else {
+ const char *str = "\0";
+
+ of_property_read_string(node, "blue-and-red-wiring", &str);
+ if (0 == strcmp(str, "crossed")) {
+ DBG("Configured for crossed blue and red wires");
+ priv->pixelformats = tilcdc_crossed_formats;
+ priv->num_pixelformats =
+ ARRAY_SIZE(tilcdc_crossed_formats);
+ bpp = 32; /* Choose bpp with RGB support for fbdef */
+ } else if (0 == strcmp(str, "straight")) {
+ DBG("Configured for straight blue and red wires");
+ priv->pixelformats = tilcdc_straight_formats;
+ priv->num_pixelformats =
+ ARRAY_SIZE(tilcdc_straight_formats);
+ bpp = 16; /* Choose bpp with RGB support for fbdef */
+ } else {
+ DBG("Blue and red wiring '%s' unknown, use legacy mode",
+ str);
+ priv->pixelformats = tilcdc_legacy_formats;
+ priv->num_pixelformats =
+ ARRAY_SIZE(tilcdc_legacy_formats);
+ bpp = 16; /* This is just a guess */
+ }
+ }
+
+ ret = tilcdc_crtc_create(ddev);
+ if (ret < 0) {
+ dev_err(dev, "failed to create crtc\n");
+ goto init_failed;
+ }
+ modeset_init(ddev);
+
+#ifdef CONFIG_CPU_FREQ
+ priv->freq_transition.notifier_call = cpufreq_transition;
+ ret = cpufreq_register_notifier(&priv->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ if (ret) {
+ dev_err(dev, "failed to register cpufreq notifier\n");
+ priv->freq_transition.notifier_call = NULL;
+ goto init_failed;
+ }
+#endif
+
+ if (priv->is_componentized) {
+ ret = component_bind_all(dev, ddev);
+ if (ret < 0)
+ goto init_failed;
+
+ ret = tilcdc_add_component_encoder(ddev);
+ if (ret < 0)
+ goto init_failed;
+ } else {
+ ret = tilcdc_attach_external_device(ddev);
+ if (ret)
+ goto init_failed;
+ }
+
+ if (!priv->external_connector &&
+ ((priv->num_encoders == 0) || (priv->num_connectors == 0))) {
+ dev_err(dev, "no encoders/connectors found\n");
+ ret = -EPROBE_DEFER;
+ goto init_failed;
+ }
+
+ ret = drm_vblank_init(ddev, 1);
+ if (ret < 0) {
+ dev_err(dev, "failed to initialize vblank\n");
+ goto init_failed;
+ }
+
+ ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
+ if (ret < 0) {
+ dev_err(dev, "failed to install IRQ handler\n");
+ goto init_failed;
+ }
+
+ drm_mode_config_reset(ddev);
+
+ drm_kms_helper_poll_init(ddev);
+
+ ret = drm_dev_register(ddev, 0);
+ if (ret)
+ goto init_failed;
+ priv->is_registered = true;
+
+ drm_fbdev_generic_setup(ddev, bpp);
+ return 0;
+
+init_failed:
+ tilcdc_fini(ddev);
+
+ return ret;
+}
+
+static irqreturn_t tilcdc_irq(int irq, void *arg)
+{
+ struct drm_device *dev = arg;
+ struct tilcdc_drm_private *priv = dev->dev_private;
+ return tilcdc_crtc_irq(priv->crtc);
+}
+
+#if defined(CONFIG_DEBUG_FS)
+static const struct {
+ const char *name;
+ uint8_t rev;
+ uint8_t save;
+ uint32_t reg;
+} registers[] = {
+#define REG(rev, save, reg) { #reg, rev, save, reg }
+ /* exists in revision 1: */
+ REG(1, false, LCDC_PID_REG),
+ REG(1, true, LCDC_CTRL_REG),
+ REG(1, false, LCDC_STAT_REG),
+ REG(1, true, LCDC_RASTER_CTRL_REG),
+ REG(1, true, LCDC_RASTER_TIMING_0_REG),
+ REG(1, true, LCDC_RASTER_TIMING_1_REG),
+ REG(1, true, LCDC_RASTER_TIMING_2_REG),
+ REG(1, true, LCDC_DMA_CTRL_REG),
+ REG(1, true, LCDC_DMA_FB_BASE_ADDR_0_REG),
+ REG(1, true, LCDC_DMA_FB_CEILING_ADDR_0_REG),
+ REG(1, true, LCDC_DMA_FB_BASE_ADDR_1_REG),
+ REG(1, true, LCDC_DMA_FB_CEILING_ADDR_1_REG),
+ /* new in revision 2: */
+ REG(2, false, LCDC_RAW_STAT_REG),
+ REG(2, false, LCDC_MASKED_STAT_REG),
+ REG(2, true, LCDC_INT_ENABLE_SET_REG),
+ REG(2, false, LCDC_INT_ENABLE_CLR_REG),
+ REG(2, false, LCDC_END_OF_INT_IND_REG),
+ REG(2, true, LCDC_CLK_ENABLE_REG),
+#undef REG
+};
+
+#endif
+
+#ifdef CONFIG_DEBUG_FS
+static int tilcdc_regs_show(struct seq_file *m, void *arg)
+{
+ struct drm_info_node *node = (struct drm_info_node *) m->private;
+ struct drm_device *dev = node->minor->dev;
+ struct tilcdc_drm_private *priv = dev->dev_private;
+ unsigned i;
+
+ pm_runtime_get_sync(dev->dev);
+
+ seq_printf(m, "revision: %d\n", priv->rev);
+
+ for (i = 0; i < ARRAY_SIZE(registers); i++)
+ if (priv->rev >= registers[i].rev)
+ seq_printf(m, "%s:\t %08x\n", registers[i].name,
+ tilcdc_read(dev, registers[i].reg));
+
+ pm_runtime_put_sync(dev->dev);
+
+ return 0;
+}
+
+static int tilcdc_mm_show(struct seq_file *m, void *arg)
+{
+ struct drm_info_node *node = (struct drm_info_node *) m->private;
+ struct drm_device *dev = node->minor->dev;
+ struct drm_printer p = drm_seq_file_printer(m);
+ drm_mm_print(&dev->vma_offset_manager->vm_addr_space_mm, &p);
+ return 0;
+}
+
+static struct drm_info_list tilcdc_debugfs_list[] = {
+ { "regs", tilcdc_regs_show, 0 },
+ { "mm", tilcdc_mm_show, 0 },
+};
+
+static void tilcdc_debugfs_init(struct drm_minor *minor)
+{
+ struct tilcdc_module *mod;
+
+ drm_debugfs_create_files(tilcdc_debugfs_list,
+ ARRAY_SIZE(tilcdc_debugfs_list),
+ minor->debugfs_root, minor);
+
+ list_for_each_entry(mod, &module_list, list)
+ if (mod->funcs->debugfs_init)
+ mod->funcs->debugfs_init(mod, minor);
+}
+#endif
+
+DEFINE_DRM_GEM_CMA_FOPS(fops);
+
+static struct drm_driver tilcdc_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+ .irq_handler = tilcdc_irq,
+ DRM_GEM_CMA_DRIVER_OPS,
+#ifdef CONFIG_DEBUG_FS
+ .debugfs_init = tilcdc_debugfs_init,
+#endif
+ .fops = &fops,
+ .name = "tilcdc",
+ .desc = "TI LCD Controller DRM",
+ .date = "20121205",
+ .major = 1,
+ .minor = 0,
+};
+
+/*
+ * Power management:
+ */
+
+#ifdef CONFIG_PM_SLEEP
+static int tilcdc_pm_suspend(struct device *dev)
+{
+ struct drm_device *ddev = dev_get_drvdata(dev);
+ int ret = 0;
+
+ ret = drm_mode_config_helper_suspend(ddev);
+
+ /* Select sleep pin state */
+ pinctrl_pm_select_sleep_state(dev);
+
+ return ret;
+}
+
+static int tilcdc_pm_resume(struct device *dev)
+{
+ struct drm_device *ddev = dev_get_drvdata(dev);
+
+ /* Select default pin state */
+ pinctrl_pm_select_default_state(dev);
+ return drm_mode_config_helper_resume(ddev);
+}
+#endif
+
+static const struct dev_pm_ops tilcdc_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend, tilcdc_pm_resume)
+};
+
+/*
+ * Platform driver:
+ */
+static int tilcdc_bind(struct device *dev)
+{
+ return tilcdc_init(&tilcdc_driver, dev);
+}
+
+static void tilcdc_unbind(struct device *dev)
+{
+ struct drm_device *ddev = dev_get_drvdata(dev);
+
+ /* Check if a subcomponent has already triggered the unloading. */
+ if (!ddev->dev_private)
+ return;
+
+ tilcdc_fini(dev_get_drvdata(dev));
+}
+
+static const struct component_master_ops tilcdc_comp_ops = {
+ .bind = tilcdc_bind,
+ .unbind = tilcdc_unbind,
+};
+
+static int tilcdc_pdev_probe(struct platform_device *pdev)
+{
+ struct component_match *match = NULL;
+ int ret;
+
+ /* bail out early if no DT data: */
+ if (!pdev->dev.of_node) {
+ dev_err(&pdev->dev, "device-tree data is missing\n");
+ return -ENXIO;
+ }
+
+ ret = tilcdc_get_external_components(&pdev->dev, &match);
+ if (ret < 0)
+ return ret;
+ else if (ret == 0)
+ return tilcdc_init(&tilcdc_driver, &pdev->dev);
+ else
+ return component_master_add_with_match(&pdev->dev,
+ &tilcdc_comp_ops,
+ match);
+}
+
+static int tilcdc_pdev_remove(struct platform_device *pdev)
+{
+ int ret;
+
+ ret = tilcdc_get_external_components(&pdev->dev, NULL);
+ if (ret < 0)
+ return ret;
+ else if (ret == 0)
+ tilcdc_fini(platform_get_drvdata(pdev));
+ else
+ component_master_del(&pdev->dev, &tilcdc_comp_ops);
+
+ return 0;
+}
+
+static struct of_device_id tilcdc_of_match[] = {
+ { .compatible = "ti,am33xx-tilcdc", },
+ { .compatible = "ti,da850-tilcdc", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tilcdc_of_match);
+
+static struct platform_driver tilcdc_platform_driver = {
+ .probe = tilcdc_pdev_probe,
+ .remove = tilcdc_pdev_remove,
+ .driver = {
+ .name = "tilcdc",
+ .pm = &tilcdc_pm_ops,
+ .of_match_table = tilcdc_of_match,
+ },
+};
+
+static int __init tilcdc_drm_init(void)
+{
+ DBG("init");
+ tilcdc_panel_init();
+ return platform_driver_register(&tilcdc_platform_driver);
+}
+
+static void __exit tilcdc_drm_fini(void)
+{
+ DBG("fini");
+ platform_driver_unregister(&tilcdc_platform_driver);
+ tilcdc_panel_fini();
+}
+
+module_init(tilcdc_drm_init);
+module_exit(tilcdc_drm_fini);
+
+MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
+MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 03:27:59 +0000