linux/drivers/gpu/drm/shmobile/shmob_drm_drv.c
Daniel Vetter b0e898ac55 drm: remove FASYNC support
So I've stumbled over drm_fasync and wondered what it does. Digging
that up is quite a story.

First I've had to read up on what this does and ended up being rather
bewildered why peopled loved signals so much back in the days that
they've created SIGIO just for that ...

Then I wondered how this ever works, and what that strange "No-op."
comment right above it should mean. After all calling the core fasync
helper is pretty obviously not a noop. After reading through the
kernels FASYNC implementation I've noticed that signals are only sent
out to the processes attached with FASYNC by calling kill_fasync.

No merged drm driver has ever done that.

After more digging I've found out that the only driver that ever used
this is the so called GAMMA driver. I've frankly never heard of such a
gpu brand ever before. Now FASYNC seems to not have been the only bad
thing with that driver, since Dave Airlie removed it from the drm
driver with prejudice:

commit 1430163b4bbf7b00367ea1066c1c5fe85dbeefed
Author: Dave Airlie <airlied@linux.ie>
Date:   Sun Aug 29 12:04:35 2004 +0000

    Drop GAMMA DRM from a great height ...

Long story short, the drm fasync support seems to be doing absolutely
nothing. And the only user of it was never merged into the upstream
kernel. And we don't need any fops->fasync callback since the fcntl
implementation in the kernel already implements the noop case
correctly.

So stop this particular cargo-cult and rip it all out.

v2: Kill drm_fasync assignments in rcar (newly added) and imx drivers
(somehow I've missed that one in staging). Also drop the reference in
the drm DocBook. ARM compile-fail reported by Rob Clark.

v3: Move the removal of dev->buf_asnyc assignment in drm_setup to this
patch here.

v4: Actually git add ... tsk.

Cc: Dave Airlie <airlied@linux.ie>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Rob Clark <robdclark@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2013-08-19 10:05:17 +10:00

359 lines
9.1 KiB
C

/*
* shmob_drm_drv.c -- SH Mobile DRM driver
*
* Copyright (C) 2012 Renesas Corporation
*
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include "shmob_drm_crtc.h"
#include "shmob_drm_drv.h"
#include "shmob_drm_kms.h"
#include "shmob_drm_plane.h"
#include "shmob_drm_regs.h"
/* -----------------------------------------------------------------------------
* Hardware initialization
*/
static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
{
static const u32 ldmt1r[] = {
[SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
[SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
[SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
[SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
[SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
[SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
[SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
[SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
[SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
[SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
[SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
[SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
[SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
[SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
[SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
[SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
[SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
[SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
[SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
};
if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
dev_err(sdev->dev, "invalid interface type %u\n",
sdev->pdata->iface.interface);
return -EINVAL;
}
sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
return 0;
}
static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
enum shmob_drm_clk_source clksrc)
{
struct clk *clk;
char *clkname;
switch (clksrc) {
case SHMOB_DRM_CLK_BUS:
clkname = "bus_clk";
sdev->lddckr = LDDCKR_ICKSEL_BUS;
break;
case SHMOB_DRM_CLK_PERIPHERAL:
clkname = "peripheral_clk";
sdev->lddckr = LDDCKR_ICKSEL_MIPI;
break;
case SHMOB_DRM_CLK_EXTERNAL:
clkname = NULL;
sdev->lddckr = LDDCKR_ICKSEL_HDMI;
break;
default:
return -EINVAL;
}
clk = devm_clk_get(sdev->dev, clkname);
if (IS_ERR(clk)) {
dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
return PTR_ERR(clk);
}
sdev->clock = clk;
return 0;
}
/* -----------------------------------------------------------------------------
* DRM operations
*/
static int shmob_drm_unload(struct drm_device *dev)
{
drm_kms_helper_poll_fini(dev);
drm_mode_config_cleanup(dev);
drm_vblank_cleanup(dev);
drm_irq_uninstall(dev);
dev->dev_private = NULL;
return 0;
}
static int shmob_drm_load(struct drm_device *dev, unsigned long flags)
{
struct shmob_drm_platform_data *pdata = dev->dev->platform_data;
struct platform_device *pdev = dev->platformdev;
struct shmob_drm_device *sdev;
struct resource *res;
unsigned int i;
int ret;
if (pdata == NULL) {
dev_err(dev->dev, "no platform data\n");
return -EINVAL;
}
sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
if (sdev == NULL) {
dev_err(dev->dev, "failed to allocate private data\n");
return -ENOMEM;
}
sdev->dev = &pdev->dev;
sdev->pdata = pdata;
spin_lock_init(&sdev->irq_lock);
sdev->ddev = dev;
dev->dev_private = sdev;
/* I/O resources and clocks */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "failed to get memory resource\n");
return -EINVAL;
}
sdev->mmio = devm_ioremap_nocache(&pdev->dev, res->start,
resource_size(res));
if (sdev->mmio == NULL) {
dev_err(&pdev->dev, "failed to remap memory resource\n");
return -ENOMEM;
}
ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
if (ret < 0)
return ret;
ret = shmob_drm_init_interface(sdev);
if (ret < 0)
return ret;
ret = shmob_drm_modeset_init(sdev);
if (ret < 0) {
dev_err(&pdev->dev, "failed to initialize mode setting\n");
return ret;
}
for (i = 0; i < 4; ++i) {
ret = shmob_drm_plane_create(sdev, i);
if (ret < 0) {
dev_err(&pdev->dev, "failed to create plane %u\n", i);
goto done;
}
}
ret = drm_vblank_init(dev, 1);
if (ret < 0) {
dev_err(&pdev->dev, "failed to initialize vblank\n");
goto done;
}
ret = drm_irq_install(dev);
if (ret < 0) {
dev_err(&pdev->dev, "failed to install IRQ handler\n");
goto done;
}
platform_set_drvdata(pdev, sdev);
done:
if (ret)
shmob_drm_unload(dev);
return ret;
}
static void shmob_drm_preclose(struct drm_device *dev, struct drm_file *file)
{
struct shmob_drm_device *sdev = dev->dev_private;
shmob_drm_crtc_cancel_page_flip(&sdev->crtc, file);
}
static irqreturn_t shmob_drm_irq(int irq, void *arg)
{
struct drm_device *dev = arg;
struct shmob_drm_device *sdev = dev->dev_private;
unsigned long flags;
u32 status;
/* Acknowledge interrupts. Putting interrupt enable and interrupt flag
* bits in the same register is really brain-dead design and requires
* taking a spinlock.
*/
spin_lock_irqsave(&sdev->irq_lock, flags);
status = lcdc_read(sdev, LDINTR);
lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
spin_unlock_irqrestore(&sdev->irq_lock, flags);
if (status & LDINTR_VES) {
drm_handle_vblank(dev, 0);
shmob_drm_crtc_finish_page_flip(&sdev->crtc);
}
return IRQ_HANDLED;
}
static int shmob_drm_enable_vblank(struct drm_device *dev, int crtc)
{
struct shmob_drm_device *sdev = dev->dev_private;
shmob_drm_crtc_enable_vblank(sdev, true);
return 0;
}
static void shmob_drm_disable_vblank(struct drm_device *dev, int crtc)
{
struct shmob_drm_device *sdev = dev->dev_private;
shmob_drm_crtc_enable_vblank(sdev, false);
}
static const struct file_operations shmob_drm_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 shmob_drm_driver = {
.driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
| DRIVER_PRIME,
.load = shmob_drm_load,
.unload = shmob_drm_unload,
.preclose = shmob_drm_preclose,
.irq_handler = shmob_drm_irq,
.get_vblank_counter = drm_vblank_count,
.enable_vblank = shmob_drm_enable_vblank,
.disable_vblank = shmob_drm_disable_vblank,
.gem_free_object = drm_gem_cma_free_object,
.gem_vm_ops = &drm_gem_cma_vm_ops,
.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 = drm_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,
.dumb_create = drm_gem_cma_dumb_create,
.dumb_map_offset = drm_gem_cma_dumb_map_offset,
.dumb_destroy = drm_gem_dumb_destroy,
.fops = &shmob_drm_fops,
.name = "shmob-drm",
.desc = "Renesas SH Mobile DRM",
.date = "20120424",
.major = 1,
.minor = 0,
};
/* -----------------------------------------------------------------------------
* Power management
*/
#if CONFIG_PM_SLEEP
static int shmob_drm_pm_suspend(struct device *dev)
{
struct shmob_drm_device *sdev = dev_get_drvdata(dev);
drm_kms_helper_poll_disable(sdev->ddev);
shmob_drm_crtc_suspend(&sdev->crtc);
return 0;
}
static int shmob_drm_pm_resume(struct device *dev)
{
struct shmob_drm_device *sdev = dev_get_drvdata(dev);
drm_modeset_lock_all(sdev->ddev);
shmob_drm_crtc_resume(&sdev->crtc);
drm_modeset_unlock_all(sdev->ddev);
drm_kms_helper_poll_enable(sdev->ddev);
return 0;
}
#endif
static const struct dev_pm_ops shmob_drm_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
};
/* -----------------------------------------------------------------------------
* Platform driver
*/
static int shmob_drm_probe(struct platform_device *pdev)
{
return drm_platform_init(&shmob_drm_driver, pdev);
}
static int shmob_drm_remove(struct platform_device *pdev)
{
drm_platform_exit(&shmob_drm_driver, pdev);
return 0;
}
static struct platform_driver shmob_drm_platform_driver = {
.probe = shmob_drm_probe,
.remove = shmob_drm_remove,
.driver = {
.owner = THIS_MODULE,
.name = "shmob-drm",
.pm = &shmob_drm_pm_ops,
},
};
module_platform_driver(shmob_drm_platform_driver);
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
MODULE_LICENSE("GPL");