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jz4780_drv.c
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jz4780_drv.c
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/*
* Copyright (C) 2014 Imagination Technologies
* Author: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
*
* LCDC DRM driver for Ingenic JZ4780, based on the tilcdc driver
*
* 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/>.
*/
#include "jz4780_drv.h"
#include "jz4780_regs.h"
#include "drm_fb_helper.h"
#include "dwc_hdmi.h"
#include "hashtable.h"
#include "reservation.h"
struct jz4780_resobj {
struct hlist_node hlist_node;
struct drm_gem_object *obj;
struct reservation_object resobj;
};
static struct of_device_id jz4780_of_match[];
static DEFINE_HASHTABLE(jz4780_resobj_hlist, 5);
static struct drm_framebuffer *jz4780_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 jz4780_fb_output_poll_changed(struct drm_device *dev)
{
struct jz4780_drm_private *priv = dev->dev_private;
if (priv->fbdev)
drm_fbdev_cma_hotplug_event(priv->fbdev);
}
static const struct drm_mode_config_funcs mode_config_funcs = {
.fb_create = jz4780_fb_create,
.output_poll_changed = jz4780_fb_output_poll_changed,
};
void modeset_init(struct drm_device *dev)
{
struct jz4780_drm_private *priv = dev->dev_private;
priv->crtc = jz4780_crtc_create(dev);
dev->mode_config.min_width = 0;
dev->mode_config.min_height = 0;
dev->mode_config.max_width = 2048;
dev->mode_config.max_height = 2048;
dev->mode_config.async_page_flip = true;
dev->mode_config.funcs = &mode_config_funcs;
}
/*
* DRM operations:
*/
static int jz4780_unload(struct drm_device *dev)
{
struct jz4780_drm_private *priv = dev->dev_private;
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);
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 jz4780_load(struct drm_device *dev, unsigned long flags)
{
struct platform_device *pdev = dev->platformdev;
struct platform_device *hdmi_pdev;
struct device_node *node = pdev->dev.of_node;
struct jz4780_drm_private *priv;
struct resource *res;
struct device_node *hdmi_node;
struct dwc_hdmi *hdmi;
uint32_t hdmi_phandle;
int ret;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
DRM_DEBUG_DRIVER("failed to allocate private data\n");
return -ENOMEM;
}
dev->dev_private = priv;
priv->wq = alloc_ordered_workqueue("jz4780", 0);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
DRM_DEBUG_DRIVER("failed to get memory resource\n");
ret = -EINVAL;
goto fail;
}
priv->mmio = ioremap_nocache(res->start, resource_size(res));
if (!priv->mmio) {
DRM_DEBUG_DRIVER("failed to ioremap\n");
ret = -ENOMEM;
goto fail;
}
priv->clk = clk_get(dev->dev, "lcd_clk");
if (IS_ERR(priv->clk)) {
DRM_DEBUG_DRIVER("failed to get lcd clock\n");
ret = -ENODEV;
goto fail;
}
clk_prepare_enable(priv->clk);
priv->disp_clk = clk_get(dev->dev, "lcd_pixclk");
if (IS_ERR(priv->clk)) {
DRM_DEBUG_DRIVER("failed to get pixel clock\n");
ret = -ENODEV;
goto fail;
}
clk_prepare_enable(priv->disp_clk);
if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
priv->max_bandwidth = JZ4780_DEFAULT_MAX_BANDWIDTH;
if (of_property_read_u32(node, "max-width", &priv->max_width))
priv->max_width = JZ4780_DEFAULT_MAX_WIDTH;
if (of_property_read_u32(node, "max-pixelclock",
&priv->max_pixelclock))
priv->max_pixelclock = JZ4780_DEFAULT_MAX_PIXELCLOCK;
drm_mode_config_init(dev);
if (of_property_read_u32(node, "hdmi", &hdmi_phandle)) {
dev_warn(&pdev->dev, "could not get hdmi phandle\n");
} else {
hdmi_node = of_find_node_by_phandle(hdmi_phandle);
if (!hdmi_node) {
dev_err(&pdev->dev, "could not get hdmi node\n");
return -ENODEV;
}
hdmi_pdev = of_find_device_by_node(hdmi_node);
if (!hdmi_pdev) {
dev_err(&pdev->dev, "hdmi platform device not found\n");
return -ENODEV;
}
hdmi = platform_get_drvdata(hdmi_pdev);
hdmi->drm = dev;
dwc_hdmi_register(hdmi, dev);
priv->encoders[priv->num_encoders++] = &hdmi->encoder;
priv->connectors[priv->num_connectors++] = &hdmi->connector;
}
modeset_init(dev);
ret = drm_vblank_init(dev, 1);
if (ret < 0) {
DRM_DEBUG_DRIVER("failed to initialize vblank\n");
goto fail;
}
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) {
DRM_DEBUG_DRIVER("failed to install IRQ handler\n");
goto fail;
}
platform_set_drvdata(pdev, dev);
priv->fbdev = drm_fbdev_cma_init(dev, 32,
dev->mode_config.num_crtc,
dev->mode_config.num_connector);
drm_kms_helper_poll_init(dev);
return 0;
fail:
jz4780_unload(dev);
return ret;
}
static void jz4780_preclose(struct drm_device *dev, struct drm_file *file)
{
struct jz4780_drm_private *priv = dev->dev_private;
jz4780_crtc_cancel_page_flip(priv->crtc, file);
}
static void jz4780_lastclose(struct drm_device *dev)
{
struct jz4780_drm_private *priv = dev->dev_private;
drm_fbdev_cma_restore_mode(priv->fbdev);
}
static void jz4780_irq_uninstall(struct drm_device *dev)
{
u32 tmp;
tmp = jz4780_read(dev, LCDC_CTRL);
/* disable irqs that we might have enabled */
jz4780_write(dev, LCDC_CTRL, tmp & ~LCDC_CTRL_EOFM);
}
static irqreturn_t jz4780_irq(int irq, void *arg)
{
struct drm_device *dev = arg;
struct jz4780_drm_private *priv = dev->dev_private;
return jz4780_crtc_irq(priv->crtc);
}
static void enable_vblank(struct drm_device *dev, bool enable)
{
u32 tmp;
/* clear previous EOF flag */
tmp = jz4780_read(dev, LCDC_STATE);
jz4780_write(dev, LCDC_STATE, tmp & ~LCDC_STATE_EOF);
/* enable end of frame interrupt */
tmp = jz4780_read(dev, LCDC_CTRL);
if (enable)
jz4780_write(dev, LCDC_CTRL, tmp | LCDC_CTRL_EOFM);
else
jz4780_write(dev, LCDC_CTRL, tmp & ~LCDC_CTRL_EOFM);
}
static int jz4780_enable_vblank(struct drm_device *dev, int crtc)
{
enable_vblank(dev, true);
return 0;
}
static void jz4780_disable_vblank(struct drm_device *dev, int crtc)
{
enable_vblank(dev, false);
}
static struct jz4780_resobj *jz4780_resobj_lookup(struct drm_gem_object *obj)
{
struct jz4780_resobj *jz4780_resobj_cursor;
struct jz4780_resobj *jz4780_resobj = NULL;
hash_for_each_possible(jz4780_resobj_hlist, jz4780_resobj_cursor,
hlist_node, (unsigned long)obj) {
if (jz4780_resobj_cursor->obj == obj) {
jz4780_resobj = jz4780_resobj_cursor;
break;
}
}
return jz4780_resobj;
}
struct reservation_object *jz4780_drv_lookup_resobj(struct drm_gem_object *obj)
{
struct jz4780_resobj *jz4780_resobj = jz4780_resobj_lookup(obj);
if (!jz4780_resobj) {
jz4780_resobj = kzalloc(sizeof(*jz4780_resobj), GFP_KERNEL);
if (!jz4780_resobj)
return NULL;
jz4780_resobj->obj = obj;
INIT_HLIST_NODE(&jz4780_resobj->hlist_node);
reservation_object_init(&jz4780_resobj->resobj);
hash_add(jz4780_resobj_hlist, &jz4780_resobj->hlist_node,
(unsigned long)obj);
}
return &jz4780_resobj->resobj;
}
static void jz4780_gem_cma_free_object(struct drm_gem_object *obj)
{
struct jz4780_resobj *jz4780_resobj = jz4780_resobj_lookup(obj);
if (jz4780_resobj) {
hash_del(&jz4780_resobj->hlist_node);
reservation_object_wait_timeout_rcu(&jz4780_resobj->resobj,
true, false, MAX_SCHEDULE_TIMEOUT);
reservation_object_fini(&jz4780_resobj->resobj);
kfree(jz4780_resobj);
}
drm_gem_cma_free_object(obj);
}
static struct dma_buf *jz4780_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj, int flags)
{
/* Read/write access required */
flags |= O_RDWR;
return drm_gem_prime_export(dev, obj, flags);
}
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 jz4780_driver = {
.driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET |
DRIVER_PRIME,
.load = jz4780_load,
.unload = jz4780_unload,
.preclose = jz4780_preclose,
.lastclose = jz4780_lastclose,
.set_busid = drm_platform_set_busid,
.irq_handler = jz4780_irq,
.irq_uninstall = jz4780_irq_uninstall,
.get_vblank_counter = drm_vblank_count,
.enable_vblank = jz4780_enable_vblank,
.disable_vblank = jz4780_disable_vblank,
.gem_free_object = jz4780_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,
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import = drm_gem_prime_import,
.gem_prime_export = jz4780_gem_prime_export,
.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
.gem_prime_vmap = drm_gem_cma_prime_vmap,
.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
.gem_prime_mmap = drm_gem_cma_prime_mmap,
.gem_prime_res_obj = jz4780_drv_lookup_resobj,
.fops = &fops,
.name = "jz4780",
.desc = "Ingenic LCD Controller DRM",
.date = "20140623",
.major = 1,
.minor = 0,
};
/*
* Platform driver:
*/
static int jz4780_pdev_probe(struct platform_device *pdev)
{
struct device_node *hdmi_node;
struct device_node *ddc_node;
uint32_t hdmi_phandle;
void * ddc;
/* bail out early if no DT data: */
if (!pdev->dev.of_node) {
DRM_DEBUG_DRIVER("device-tree data is missing\n");
return -ENXIO;
}
ddc_node = of_parse_phandle(pdev->dev.of_node, "ddc", 0);
if (ddc_node) {
ddc = of_find_i2c_adapter_by_node(ddc_node);
if (!ddc) {
dev_dbg(&pdev->dev, "failed to read i2c ddc node\n");
return -EPROBE_DEFER;
}
}
if (of_property_read_u32(pdev->dev.of_node, "hdmi", &hdmi_phandle)) {
dev_warn(&pdev->dev, "could not get hdmi phandle\n");
} else {
hdmi_node = of_find_node_by_phandle(hdmi_phandle);
if (!hdmi_node) {
dev_err(&pdev->dev, "could not get hdmi node\n");
return -EPROBE_DEFER;
}
}
return drm_platform_init(&jz4780_driver, pdev);
}
static int jz4780_pdev_remove(struct platform_device *pdev)
{
drm_put_dev(platform_get_drvdata(pdev));
return 0;
}
static struct of_device_id jz4780_of_match[] = {
{ .compatible = "ingenic,jz4780-lcd", },
{ },
};
MODULE_DEVICE_TABLE(of, jz4780_of_match);
static struct platform_driver jz4780_platform_driver = {
.probe = jz4780_pdev_probe,
.remove = jz4780_pdev_remove,
.driver = {
.owner = THIS_MODULE,
.name = "jz4780_drm",
.of_match_table = jz4780_of_match,
},
};
static int __init jz4780_drm_init(void)
{
DRM_DEBUG_DRIVER("init");
return platform_driver_register(&jz4780_platform_driver);
}
static void __exit jz4780_drm_fini(void)
{
DRM_DEBUG_DRIVER("fini");
platform_driver_unregister(&jz4780_platform_driver);
}
late_initcall(jz4780_drm_init);
module_init(jz4780_drm_init);
module_exit(jz4780_drm_fini);
MODULE_AUTHOR("Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>");
MODULE_DESCRIPTION("Ingenic JZ4780 LCD/HDMI Driver");
MODULE_LICENSE("GPL");