Commit 4de6a2d6 authored by Thierry Reding's avatar Thierry Reding

gpu: host1x: Add MIPI pad calibration support

This driver adds support to perform calibration of the MIPI pads for CSI
and DSI.
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 4c48140a
......@@ -7,6 +7,7 @@ host1x-y = \
channel.o \
job.o \
debug.o \
mipi.o \
hw/host1x01.o \
hw/host1x02.o
......
......@@ -210,17 +210,26 @@ static int __init tegra_host1x_init(void)
return err;
err = platform_driver_register(&tegra_host1x_driver);
if (err < 0) {
host1x_bus_exit();
return err;
}
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:
host1x_bus_exit();
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);
host1x_bus_exit();
}
......
......@@ -306,4 +306,6 @@ static inline void host1x_hw_show_mlocks(struct host1x *host, struct output *o)
host->debug_op->show_mlocks(host, o);
}
extern struct platform_driver tegra_mipi_driver;
#endif
/*
* Copyright (C) 2013 NVIDIA Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#define MIPI_CAL_CTRL 0x00
#define MIPI_CAL_CTRL_START (1 << 0)
#define MIPI_CAL_AUTOCAL_CTRL 0x01
#define MIPI_CAL_STATUS 0x02
#define MIPI_CAL_STATUS_DONE (1 << 16)
#define MIPI_CAL_STATUS_ACTIVE (1 << 0)
#define MIPI_CAL_CONFIG_CSIA 0x05
#define MIPI_CAL_CONFIG_CSIB 0x06
#define MIPI_CAL_CONFIG_CSIC 0x07
#define MIPI_CAL_CONFIG_CSID 0x08
#define MIPI_CAL_CONFIG_CSIE 0x09
#define MIPI_CAL_CONFIG_DSIA 0x0e
#define MIPI_CAL_CONFIG_DSIB 0x0f
#define MIPI_CAL_CONFIG_DSIC 0x10
#define MIPI_CAL_CONFIG_DSID 0x11
#define MIPI_CAL_CONFIG_SELECT (1 << 21)
#define MIPI_CAL_CONFIG_HSPDOS(x) (((x) & 0x1f) << 16)
#define MIPI_CAL_CONFIG_HSPUOS(x) (((x) & 0x1f) << 8)
#define MIPI_CAL_CONFIG_TERMOS(x) (((x) & 0x1f) << 0)
#define MIPI_CAL_BIAS_PAD_CFG0 0x16
#define MIPI_CAL_BIAS_PAD_PDVCLAMP (1 << 1)
#define MIPI_CAL_BIAS_PAD_E_VCLAMP_REF (1 << 0)
#define MIPI_CAL_BIAS_PAD_CFG1 0x17
#define MIPI_CAL_BIAS_PAD_CFG2 0x18
#define MIPI_CAL_BIAS_PAD_PDVREG (1 << 1)
static const struct module {
unsigned long reg;
} modules[] = {
{ .reg = MIPI_CAL_CONFIG_CSIA },
{ .reg = MIPI_CAL_CONFIG_CSIB },
{ .reg = MIPI_CAL_CONFIG_CSIC },
{ .reg = MIPI_CAL_CONFIG_CSID },
{ .reg = MIPI_CAL_CONFIG_CSIE },
{ .reg = MIPI_CAL_CONFIG_DSIA },
{ .reg = MIPI_CAL_CONFIG_DSIB },
{ .reg = MIPI_CAL_CONFIG_DSIC },
{ .reg = MIPI_CAL_CONFIG_DSID },
};
struct tegra_mipi {
void __iomem *regs;
struct mutex lock;
struct clk *clk;
};
struct tegra_mipi_device {
struct platform_device *pdev;
struct tegra_mipi *mipi;
struct device *device;
unsigned long pads;
};
static inline unsigned long tegra_mipi_readl(struct tegra_mipi *mipi,
unsigned long reg)
{
return readl(mipi->regs + (reg << 2));
}
static inline void tegra_mipi_writel(struct tegra_mipi *mipi,
unsigned long value, unsigned long reg)
{
writel(value, mipi->regs + (reg << 2));
}
struct tegra_mipi_device *tegra_mipi_request(struct device *device)
{
struct device_node *np = device->of_node;
struct tegra_mipi_device *dev;
struct of_phandle_args args;
int err;
err = of_parse_phandle_with_args(np, "nvidia,mipi-calibrate",
"#nvidia,mipi-calibrate-cells", 0,
&args);
if (err < 0)
return ERR_PTR(err);
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
of_node_put(args.np);
err = -ENOMEM;
goto out;
}
dev->pdev = of_find_device_by_node(args.np);
if (!dev->pdev) {
of_node_put(args.np);
err = -ENODEV;
goto free;
}
of_node_put(args.np);
dev->mipi = platform_get_drvdata(dev->pdev);
if (!dev->mipi) {
err = -EPROBE_DEFER;
goto pdev_put;
}
dev->pads = args.args[0];
dev->device = device;
return dev;
pdev_put:
platform_device_put(dev->pdev);
free:
kfree(dev);
out:
return ERR_PTR(err);
}
EXPORT_SYMBOL(tegra_mipi_request);
void tegra_mipi_free(struct tegra_mipi_device *device)
{
platform_device_put(device->pdev);
kfree(device);
}
EXPORT_SYMBOL(tegra_mipi_free);
static int tegra_mipi_wait(struct tegra_mipi *mipi)
{
unsigned long timeout = jiffies + msecs_to_jiffies(250);
unsigned long value;
while (time_before(jiffies, timeout)) {
value = tegra_mipi_readl(mipi, MIPI_CAL_STATUS);
if ((value & MIPI_CAL_STATUS_ACTIVE) == 0 &&
(value & MIPI_CAL_STATUS_DONE) != 0)
return 0;
usleep_range(10, 50);
}
return -ETIMEDOUT;
}
int tegra_mipi_calibrate(struct tegra_mipi_device *device)
{
unsigned long value;
unsigned int i;
int err;
err = clk_enable(device->mipi->clk);
if (err < 0)
return err;
mutex_lock(&device->mipi->lock);
value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG0);
value &= ~MIPI_CAL_BIAS_PAD_PDVCLAMP;
value |= MIPI_CAL_BIAS_PAD_E_VCLAMP_REF;
tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG0);
value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG2);
value &= ~MIPI_CAL_BIAS_PAD_PDVREG;
tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
for (i = 0; i < ARRAY_SIZE(modules); i++) {
if (device->pads & BIT(i))
value = MIPI_CAL_CONFIG_SELECT |
MIPI_CAL_CONFIG_HSPDOS(0) |
MIPI_CAL_CONFIG_HSPUOS(4) |
MIPI_CAL_CONFIG_TERMOS(5);
else
value = 0;
tegra_mipi_writel(device->mipi, value, modules[i].reg);
}
tegra_mipi_writel(device->mipi, MIPI_CAL_CTRL_START, MIPI_CAL_CTRL);
err = tegra_mipi_wait(device->mipi);
mutex_unlock(&device->mipi->lock);
clk_disable(device->mipi->clk);
return err;
}
EXPORT_SYMBOL(tegra_mipi_calibrate);
static int tegra_mipi_probe(struct platform_device *pdev)
{
struct tegra_mipi *mipi;
struct resource *res;
int err;
mipi = devm_kzalloc(&pdev->dev, sizeof(*mipi), GFP_KERNEL);
if (!mipi)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mipi->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(mipi->regs))
return PTR_ERR(mipi->regs);
mutex_init(&mipi->lock);
mipi->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(mipi->clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
return PTR_ERR(mipi->clk);
}
err = clk_prepare(mipi->clk);
if (err < 0)
return err;
platform_set_drvdata(pdev, mipi);
return 0;
}
static int tegra_mipi_remove(struct platform_device *pdev)
{
struct tegra_mipi *mipi = platform_get_drvdata(pdev);
clk_unprepare(mipi->clk);
return 0;
}
static struct of_device_id tegra_mipi_of_match[] = {
{ .compatible = "nvidia,tegra114-mipi", },
{ },
};
struct platform_driver tegra_mipi_driver = {
.driver = {
.name = "tegra-mipi",
.of_match_table = tegra_mipi_of_match,
},
.probe = tegra_mipi_probe,
.remove = tegra_mipi_remove,
};
......@@ -281,4 +281,10 @@ int host1x_device_exit(struct host1x_device *device);
int host1x_client_register(struct host1x_client *client);
int host1x_client_unregister(struct host1x_client *client);
struct tegra_mipi_device;
struct tegra_mipi_device *tegra_mipi_request(struct device *device);
void tegra_mipi_free(struct tegra_mipi_device *device);
int tegra_mipi_calibrate(struct tegra_mipi_device *device);
#endif
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