276 lines
6.8 KiB
C
276 lines
6.8 KiB
C
/*
|
|
* 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/host1x.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "dev.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,
|
|
};
|