--- /dev/null
+/*
+ * Copyright (C) 2012 Texas Instruments
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* LCDC DRM driver, based on da8xx-fb */
+
+#include "tilcdc_drv.h"
+#include "tilcdc_regs.h"
+#include "tilcdc_tfp410.h"
+#include "tilcdc_slave.h"
+#include "tilcdc_panel.h"
+
+#include "drm_fb_helper.h"
+
+static LIST_HEAD(module_list);
+static bool slave_probing;
+
+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);
+}
+
+void tilcdc_slave_probedefer(bool defered)
+{
+ slave_probing = defered;
+}
+
+static struct of_device_id tilcdc_of_match[];
+
+static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
+ struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
+{
+ return drm_fb_cma_create(dev, file_priv, mode_cmd);
+}
+
+static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+ drm_fbdev_cma_hotplug_event(priv->fbdev);
+}
+
+static const struct drm_mode_config_funcs mode_config_funcs = {
+ .fb_create = tilcdc_fb_create,
+ .output_poll_changed = tilcdc_fb_output_poll_changed,
+};
+
+static int modeset_init(struct drm_device *dev)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+ struct tilcdc_module *mod;
+
+ drm_mode_config_init(dev);
+
+ priv->crtc = tilcdc_crtc_create(dev);
+
+ list_for_each_entry(mod, &module_list, list) {
+ DBG("loading module: %s", mod->name);
+ mod->funcs->modeset_init(mod, dev);
+ }
+
+ if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
+ /* oh nos! */
+ dev_err(dev->dev, "no encoders/connectors found\n");
+ drm_mode_config_cleanup(dev);
+ return -ENXIO;
+ }
+
+ 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;
+
+ return 0;
+}
+
+#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) {
+ if (priv->lcd_fck_rate != clk_get_rate(priv->clk)) {
+ priv->lcd_fck_rate = clk_get_rate(priv->clk);
+ tilcdc_crtc_update_clk(priv->crtc);
+ }
+ }
+
+ return 0;
+}
+#endif
+
+/*
+ * DRM operations:
+ */
+
+static int tilcdc_unload(struct drm_device *dev)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+
+ drm_fbdev_cma_fini(priv->fbdev);
+ drm_kms_helper_poll_fini(dev);
+ drm_mode_config_cleanup(dev);
+ drm_vblank_cleanup(dev);
+
+ pm_runtime_get_sync(dev->dev);
+ drm_irq_uninstall(dev);
+ pm_runtime_put_sync(dev->dev);
+
+#ifdef CONFIG_CPU_FREQ
+ cpufreq_unregister_notifier(&priv->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+#endif
+
+ if (priv->clk)
+ clk_put(priv->clk);
+
+ if (priv->mmio)
+ iounmap(priv->mmio);
+
+ flush_workqueue(priv->wq);
+ destroy_workqueue(priv->wq);
+
+ dev->dev_private = NULL;
+
+ pm_runtime_disable(dev->dev);
+
+ kfree(priv);
+
+ return 0;
+}
+
+static int tilcdc_load(struct drm_device *dev, unsigned long flags)
+{
+ struct platform_device *pdev = dev->platformdev;
+ struct device_node *node = pdev->dev.of_node;
+ struct tilcdc_drm_private *priv;
+ struct tilcdc_module *mod;
+ struct resource *res;
+ u32 bpp = 0;
+ int ret;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv) {
+ dev_err(dev->dev, "failed to allocate private data\n");
+ return -ENOMEM;
+ }
+
+ dev->dev_private = priv;
+
+ priv->wq = alloc_ordered_workqueue("tilcdc", 0);
+ if (!priv->wq) {
+ ret = -ENOMEM;
+ goto fail_free_priv;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev->dev, "failed to get memory resource\n");
+ ret = -EINVAL;
+ goto fail_free_wq;
+ }
+
+ priv->mmio = ioremap_nocache(res->start, resource_size(res));
+ if (!priv->mmio) {
+ dev_err(dev->dev, "failed to ioremap\n");
+ ret = -ENOMEM;
+ goto fail_free_wq;
+ }
+
+ priv->clk = clk_get(dev->dev, "fck");
+ if (IS_ERR(priv->clk)) {
+ dev_err(dev->dev, "failed to get functional clock\n");
+ ret = -ENODEV;
+ goto fail_iounmap;
+ }
+
+ priv->disp_clk = clk_get(dev->dev, "dpll_disp_ck");
+ if (IS_ERR(priv->clk)) {
+ dev_err(dev->dev, "failed to get display clock\n");
+ ret = -ENODEV;
+ goto fail_put_clk;
+ }
+
+#ifdef CONFIG_CPU_FREQ
+ priv->lcd_fck_rate = clk_get_rate(priv->clk);
+ priv->freq_transition.notifier_call = cpufreq_transition;
+ ret = cpufreq_register_notifier(&priv->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ if (ret) {
+ dev_err(dev->dev, "failed to register cpufreq notifier\n");
+ goto fail_put_disp_clk;
+ }
+#endif
+
+ 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, "ti,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, "ti,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->dev);
+
+ /* Determine LCD IP Version */
+ pm_runtime_get_sync(dev->dev);
+ switch (tilcdc_read(dev, LCDC_PID_REG)) {
+ case 0x4c100102:
+ priv->rev = 1;
+ break;
+ case 0x4f200800:
+ case 0x4f201000:
+ priv->rev = 2;
+ break;
+ default:
+ dev_warn(dev->dev, "Unknown PID Reg value 0x%08x, "
+ "defaulting to LCD revision 1\n",
+ tilcdc_read(dev, LCDC_PID_REG));
+ priv->rev = 1;
+ break;
+ }
+
+ pm_runtime_put_sync(dev->dev);
+
+ ret = modeset_init(dev);
+ if (ret < 0) {
+ dev_err(dev->dev, "failed to initialize mode setting\n");
+ goto fail_cpufreq_unregister;
+ }
+
+ ret = drm_vblank_init(dev, 1);
+ if (ret < 0) {
+ dev_err(dev->dev, "failed to initialize vblank\n");
+ goto fail_mode_config_cleanup;
+ }
+
+ pm_runtime_get_sync(dev->dev);
+ ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
+ pm_runtime_put_sync(dev->dev);
+ if (ret < 0) {
+ dev_err(dev->dev, "failed to install IRQ handler\n");
+ goto fail_vblank_cleanup;
+ }
+
+ platform_set_drvdata(pdev, dev);
+
+
+ list_for_each_entry(mod, &module_list, list) {
+ DBG("%s: preferred_bpp: %d", mod->name, mod->preferred_bpp);
+ bpp = mod->preferred_bpp;
+ if (bpp > 0)
+ break;
+ }
+
+ priv->fbdev = drm_fbdev_cma_init(dev, bpp,
+ dev->mode_config.num_crtc,
+ dev->mode_config.num_connector);
+ if (IS_ERR(priv->fbdev)) {
+ ret = PTR_ERR(priv->fbdev);
+ goto fail_irq_uninstall;
+ }
+
+ drm_kms_helper_poll_init(dev);
+
+ return 0;
+
+fail_irq_uninstall:
+ pm_runtime_get_sync(dev->dev);
+ drm_irq_uninstall(dev);
+ pm_runtime_put_sync(dev->dev);
+
+fail_vblank_cleanup:
+ drm_vblank_cleanup(dev);
+
+fail_mode_config_cleanup:
+ drm_mode_config_cleanup(dev);
+
+fail_cpufreq_unregister:
+ pm_runtime_disable(dev->dev);
+#ifdef CONFIG_CPU_FREQ
+ cpufreq_unregister_notifier(&priv->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+fail_put_disp_clk:
+ clk_put(priv->disp_clk);
+#endif
+
+fail_put_clk:
+ clk_put(priv->clk);
+
+fail_iounmap:
+ iounmap(priv->mmio);
+
+fail_free_wq:
+ flush_workqueue(priv->wq);
+ destroy_workqueue(priv->wq);
+
+fail_free_priv:
+ dev->dev_private = NULL;
+ kfree(priv);
+ return ret;
+}
+
+static void tilcdc_preclose(struct drm_device *dev, struct drm_file *file)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+
+ tilcdc_crtc_cancel_page_flip(priv->crtc, file);
+}
+
+static void tilcdc_lastclose(struct drm_device *dev)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+ drm_fbdev_cma_restore_mode(priv->fbdev);
+}
+
+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);
+}
+
+static void tilcdc_irq_preinstall(struct drm_device *dev)
+{
+ tilcdc_clear_irqstatus(dev, 0xffffffff);
+}
+
+static int tilcdc_irq_postinstall(struct drm_device *dev)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+
+ /* enable FIFO underflow irq: */
+ if (priv->rev == 1)
+ tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_UNDERFLOW_INT_ENA);
+ else
+ tilcdc_set(dev, LCDC_INT_ENABLE_SET_REG, LCDC_V2_UNDERFLOW_INT_ENA);
+
+ return 0;
+}
+
+static void tilcdc_irq_uninstall(struct drm_device *dev)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+
+ /* disable irqs that we might have enabled: */
+ if (priv->rev == 1) {
+ tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
+ LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
+ tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_V1_END_OF_FRAME_INT_ENA);
+ } else {
+ tilcdc_clear(dev, LCDC_INT_ENABLE_SET_REG,
+ LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
+ LCDC_V2_END_OF_FRAME0_INT_ENA | LCDC_V2_END_OF_FRAME1_INT_ENA |
+ LCDC_FRAME_DONE);
+ }
+
+}
+
+static void enable_vblank(struct drm_device *dev, bool enable)
+{
+ struct tilcdc_drm_private *priv = dev->dev_private;
+ u32 reg, mask;
+
+ if (priv->rev == 1) {
+ reg = LCDC_DMA_CTRL_REG;
+ mask = LCDC_V1_END_OF_FRAME_INT_ENA;
+ } else {
+ reg = LCDC_INT_ENABLE_SET_REG;
+ mask = LCDC_V2_END_OF_FRAME0_INT_ENA |
+ LCDC_V2_END_OF_FRAME1_INT_ENA | LCDC_FRAME_DONE;
+ }
+
+ if (enable)
+ tilcdc_set(dev, reg, mask);
+ else
+ tilcdc_clear(dev, reg, mask);
+}
+
+static int tilcdc_enable_vblank(struct drm_device *dev, int crtc)
+{
+ enable_vblank(dev, true);
+ return 0;
+}
+
+static void tilcdc_disable_vblank(struct drm_device *dev, int crtc)
+{
+ enable_vblank(dev, false);
+}
+
+#if defined(CONFIG_DEBUG_FS) || defined(CONFIG_PM_SLEEP)
+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, false, 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),
+ REG(2, true, LCDC_INT_ENABLE_SET_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;
+ return drm_mm_dump_table(m, &dev->vma_offset_manager->vm_addr_space_mm);
+}
+
+static struct drm_info_list tilcdc_debugfs_list[] = {
+ { "regs", tilcdc_regs_show, 0 },
+ { "mm", tilcdc_mm_show, 0 },
+ { "fb", drm_fb_cma_debugfs_show, 0 },
+};
+
+static int tilcdc_debugfs_init(struct drm_minor *minor)
+{
+ struct drm_device *dev = minor->dev;
+ struct tilcdc_module *mod;
+ int ret;
+
+ ret = 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);
+
+ if (ret) {
+ dev_err(dev->dev, "could not install tilcdc_debugfs_list\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static void tilcdc_debugfs_cleanup(struct drm_minor *minor)
+{
+ struct tilcdc_module *mod;
+ drm_debugfs_remove_files(tilcdc_debugfs_list,
+ ARRAY_SIZE(tilcdc_debugfs_list), minor);
+
+ list_for_each_entry(mod, &module_list, list)
+ if (mod->funcs->debugfs_cleanup)
+ mod->funcs->debugfs_cleanup(mod, minor);
+}
+#endif
+
+static const struct file_operations fops = {
+ .owner = THIS_MODULE,
+ .open = drm_open,
+ .release = drm_release,
+ .unlocked_ioctl = drm_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = drm_compat_ioctl,
+#endif
+ .poll = drm_poll,
+ .read = drm_read,
+ .llseek = no_llseek,
+ .mmap = drm_gem_cma_mmap,
+};
+
+static struct drm_driver tilcdc_driver = {
+ .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
+ .load = tilcdc_load,
+ .unload = tilcdc_unload,
+ .preclose = tilcdc_preclose,
+ .lastclose = tilcdc_lastclose,
+ .set_busid = drm_platform_set_busid,
+ .irq_handler = tilcdc_irq,
+ .irq_preinstall = tilcdc_irq_preinstall,
+ .irq_postinstall = tilcdc_irq_postinstall,
+ .irq_uninstall = tilcdc_irq_uninstall,
+ .get_vblank_counter = drm_vblank_count,
+ .enable_vblank = tilcdc_enable_vblank,
+ .disable_vblank = tilcdc_disable_vblank,
+ .gem_free_object = drm_gem_cma_free_object,
+ .gem_vm_ops = &drm_gem_cma_vm_ops,
+ .dumb_create = drm_gem_cma_dumb_create,
+ .dumb_map_offset = drm_gem_cma_dumb_map_offset,
+ .dumb_destroy = drm_gem_dumb_destroy,
+#ifdef CONFIG_DEBUG_FS
+ .debugfs_init = tilcdc_debugfs_init,
+ .debugfs_cleanup = tilcdc_debugfs_cleanup,
+#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);
+ struct tilcdc_drm_private *priv = ddev->dev_private;
+ unsigned i, n = 0;
+
+ drm_kms_helper_poll_disable(ddev);
+
+ /* Save register state: */
+ for (i = 0; i < ARRAY_SIZE(registers); i++)
+ if (registers[i].save && (priv->rev >= registers[i].rev))
+ priv->saved_register[n++] = tilcdc_read(ddev, registers[i].reg);
+
+ return 0;
+}
+
+static int tilcdc_pm_resume(struct device *dev)
+{
+ struct drm_device *ddev = dev_get_drvdata(dev);
+ struct tilcdc_drm_private *priv = ddev->dev_private;
+ unsigned i, n = 0;
+
+ /* Restore register state: */
+ for (i = 0; i < ARRAY_SIZE(registers); i++)
+ if (registers[i].save && (priv->rev >= registers[i].rev))
+ tilcdc_write(ddev, registers[i].reg, priv->saved_register[n++]);
+
+ drm_kms_helper_poll_enable(ddev);
+
+ return 0;
+}
+#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_pdev_probe(struct platform_device *pdev)
+{
+ /* bail out early if no DT data: */
+ if (!pdev->dev.of_node) {
+ dev_err(&pdev->dev, "device-tree data is missing\n");
+ return -ENXIO;
+ }
+
+ /* defer probing if slave is in deferred probing */
+ if (slave_probing == true)
+ return -EPROBE_DEFER;
+
+ return drm_platform_init(&tilcdc_driver, pdev);
+}
+
+static int tilcdc_pdev_remove(struct platform_device *pdev)
+{
+ drm_put_dev(platform_get_drvdata(pdev));
+
+ return 0;
+}
+
+static struct of_device_id tilcdc_of_match[] = {
+ { .compatible = "ti,am33xx-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_tfp410_init();
+ tilcdc_slave_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();
+ tilcdc_slave_fini();
+ tilcdc_tfp410_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");
Code Review / kvmfornfv.git / blobdiff