linux/drivers/gpu/host1x/dev.c
Thierry Reding f4c5cf88fb gpu: host1x: Provide a proper struct bus_type
Previously the struct bus_type exported by the host1x infrastructure was
only a very basic skeleton. Turn that implementation into a more full-
fledged bus to support proper probe ordering and power management.

Note that the bus infrastructure needs to be available before any of the
drivers can be registered. This is automatically ensured if all drivers
are built as loadable modules (via symbol dependencies). If all drivers
are built-in there are no such guarantees and the link order determines
the initcall ordering. Adjust drivers/gpu/Makefile to make sure that the
host1x bus infrastructure is initialized prior to any of its users (only
drm/tegra currently).

v2: Fix building host1x and tegra-drm as modules
    Reported-by: Dave Airlie <airlied@gmail.com>

Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Mark Zhang <markz@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
2015-01-27 10:09:14 +01:00

253 lines
5.7 KiB
C

/*
* Tegra host1x driver
*
* Copyright (c) 2010-2013, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <linux/module.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#define CREATE_TRACE_POINTS
#include <trace/events/host1x.h>
#include "bus.h"
#include "dev.h"
#include "intr.h"
#include "channel.h"
#include "debug.h"
#include "hw/host1x01.h"
#include "hw/host1x02.h"
#include "hw/host1x04.h"
void host1x_sync_writel(struct host1x *host1x, u32 v, u32 r)
{
void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
writel(v, sync_regs + r);
}
u32 host1x_sync_readl(struct host1x *host1x, u32 r)
{
void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
return readl(sync_regs + r);
}
void host1x_ch_writel(struct host1x_channel *ch, u32 v, u32 r)
{
writel(v, ch->regs + r);
}
u32 host1x_ch_readl(struct host1x_channel *ch, u32 r)
{
return readl(ch->regs + r);
}
static const struct host1x_info host1x01_info = {
.nb_channels = 8,
.nb_pts = 32,
.nb_mlocks = 16,
.nb_bases = 8,
.init = host1x01_init,
.sync_offset = 0x3000,
};
static const struct host1x_info host1x02_info = {
.nb_channels = 9,
.nb_pts = 32,
.nb_mlocks = 16,
.nb_bases = 12,
.init = host1x02_init,
.sync_offset = 0x3000,
};
static const struct host1x_info host1x04_info = {
.nb_channels = 12,
.nb_pts = 192,
.nb_mlocks = 16,
.nb_bases = 64,
.init = host1x04_init,
.sync_offset = 0x2100,
};
static struct of_device_id host1x_of_match[] = {
{ .compatible = "nvidia,tegra124-host1x", .data = &host1x04_info, },
{ .compatible = "nvidia,tegra114-host1x", .data = &host1x02_info, },
{ .compatible = "nvidia,tegra30-host1x", .data = &host1x01_info, },
{ .compatible = "nvidia,tegra20-host1x", .data = &host1x01_info, },
{ },
};
MODULE_DEVICE_TABLE(of, host1x_of_match);
static int host1x_probe(struct platform_device *pdev)
{
const struct of_device_id *id;
struct host1x *host;
struct resource *regs;
int syncpt_irq;
int err;
id = of_match_device(host1x_of_match, &pdev->dev);
if (!id)
return -EINVAL;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs) {
dev_err(&pdev->dev, "failed to get registers\n");
return -ENXIO;
}
syncpt_irq = platform_get_irq(pdev, 0);
if (syncpt_irq < 0) {
dev_err(&pdev->dev, "failed to get IRQ\n");
return -ENXIO;
}
host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
mutex_init(&host->devices_lock);
INIT_LIST_HEAD(&host->devices);
INIT_LIST_HEAD(&host->list);
host->dev = &pdev->dev;
host->info = id->data;
/* set common host1x device data */
platform_set_drvdata(pdev, host);
host->regs = devm_ioremap_resource(&pdev->dev, regs);
if (IS_ERR(host->regs))
return PTR_ERR(host->regs);
if (host->info->init) {
err = host->info->init(host);
if (err)
return err;
}
host->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(host->clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
err = PTR_ERR(host->clk);
return err;
}
err = host1x_channel_list_init(host);
if (err) {
dev_err(&pdev->dev, "failed to initialize channel list\n");
return err;
}
err = clk_prepare_enable(host->clk);
if (err < 0) {
dev_err(&pdev->dev, "failed to enable clock\n");
return err;
}
err = host1x_syncpt_init(host);
if (err) {
dev_err(&pdev->dev, "failed to initialize syncpts\n");
goto fail_unprepare_disable;
}
err = host1x_intr_init(host, syncpt_irq);
if (err) {
dev_err(&pdev->dev, "failed to initialize interrupts\n");
goto fail_deinit_syncpt;
}
host1x_debug_init(host);
err = host1x_register(host);
if (err < 0)
goto fail_deinit_intr;
return 0;
fail_deinit_intr:
host1x_intr_deinit(host);
fail_deinit_syncpt:
host1x_syncpt_deinit(host);
fail_unprepare_disable:
clk_disable_unprepare(host->clk);
return err;
}
static int host1x_remove(struct platform_device *pdev)
{
struct host1x *host = platform_get_drvdata(pdev);
host1x_unregister(host);
host1x_intr_deinit(host);
host1x_syncpt_deinit(host);
clk_disable_unprepare(host->clk);
return 0;
}
static struct platform_driver tegra_host1x_driver = {
.driver = {
.name = "tegra-host1x",
.of_match_table = host1x_of_match,
},
.probe = host1x_probe,
.remove = host1x_remove,
};
static int __init tegra_host1x_init(void)
{
int err;
err = bus_register(&host1x_bus_type);
if (err < 0)
return err;
err = platform_driver_register(&tegra_host1x_driver);
if (err < 0)
goto unregister_bus;
err = platform_driver_register(&tegra_mipi_driver);
if (err < 0)
goto unregister_host1x;
return 0;
unregister_host1x:
platform_driver_unregister(&tegra_host1x_driver);
unregister_bus:
bus_unregister(&host1x_bus_type);
return err;
}
module_init(tegra_host1x_init);
static void __exit tegra_host1x_exit(void)
{
platform_driver_unregister(&tegra_mipi_driver);
platform_driver_unregister(&tegra_host1x_driver);
bus_unregister(&host1x_bus_type);
}
module_exit(tegra_host1x_exit);
MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
MODULE_AUTHOR("Terje Bergstrom <tbergstrom@nvidia.com>");
MODULE_DESCRIPTION("Host1x driver for Tegra products");
MODULE_LICENSE("GPL");