linux/drivers/gpu/host1x/mipi.c

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/*
* 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_NOISE_FILTER(x) (((x) & 0xf) << 26)
#define MIPI_CAL_CTRL_PRESCALE(x) (((x) & 0x3) << 24)
#define MIPI_CAL_CTRL_CLKEN_OVR (1 << 4)
#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_CSIF 0x0a
#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_DSIA_CLK 0x19
#define MIPI_CAL_CONFIG_DSIB_CLK 0x1a
#define MIPI_CAL_CONFIG_CSIAB_CLK 0x1b
#define MIPI_CAL_CONFIG_DSIC_CLK 0x1c
#define MIPI_CAL_CONFIG_CSICD_CLK 0x1c
#define MIPI_CAL_CONFIG_DSID_CLK 0x1d
#define MIPI_CAL_CONFIG_CSIE_CLK 0x1d
/* for data and clock lanes */
#define MIPI_CAL_CONFIG_SELECT (1 << 21)
/* for data lanes */
#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)
/* for clock lanes */
#define MIPI_CAL_CONFIG_HSCLKPDOSD(x) (((x) & 0x1f) << 8)
#define MIPI_CAL_CONFIG_HSCLKPUOSD(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_DRV_DN_REF(x) (((x) & 0x7) << 16)
#define MIPI_CAL_BIAS_PAD_DRV_UP_REF(x) (((x) & 0x7) << 8)
#define MIPI_CAL_BIAS_PAD_CFG2 0x18
#define MIPI_CAL_BIAS_PAD_VCLAMP(x) (((x) & 0x7) << 16)
#define MIPI_CAL_BIAS_PAD_VAUXP(x) (((x) & 0x7) << 4)
#define MIPI_CAL_BIAS_PAD_PDVREG (1 << 1)
struct tegra_mipi_pad {
unsigned long data;
unsigned long clk;
};
struct tegra_mipi_soc {
bool has_clk_lane;
const struct tegra_mipi_pad *pads;
unsigned int num_pads;
bool clock_enable_override;
bool needs_vclamp_ref;
/* bias pad configuration settings */
u8 pad_drive_down_ref;
u8 pad_drive_up_ref;
u8 pad_vclamp_level;
u8 pad_vauxp_level;
/* calibration settings for data lanes */
u8 hspdos;
u8 hspuos;
u8 termos;
/* calibration settings for clock lanes */
u8 hsclkpdos;
u8 hsclkpuos;
};
struct tegra_mipi {
const struct tegra_mipi_soc *soc;
struct device *dev;
void __iomem *regs;
struct mutex lock;
struct clk *clk;
unsigned long usage_count;
};
struct tegra_mipi_device {
struct platform_device *pdev;
struct tegra_mipi *mipi;
struct device *device;
unsigned long pads;
};
static inline u32 tegra_mipi_readl(struct tegra_mipi *mipi,
unsigned long offset)
{
return readl(mipi->regs + (offset << 2));
}
static inline void tegra_mipi_writel(struct tegra_mipi *mipi, u32 value,
unsigned long offset)
{
writel(value, mipi->regs + (offset << 2));
}
static int tegra_mipi_power_up(struct tegra_mipi *mipi)
{
u32 value;
int err;
err = clk_enable(mipi->clk);
if (err < 0)
return err;
value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG0);
value &= ~MIPI_CAL_BIAS_PAD_PDVCLAMP;
if (mipi->soc->needs_vclamp_ref)
value |= MIPI_CAL_BIAS_PAD_E_VCLAMP_REF;
tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG0);
value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG2);
value &= ~MIPI_CAL_BIAS_PAD_PDVREG;
tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
clk_disable(mipi->clk);
return 0;
}
static int tegra_mipi_power_down(struct tegra_mipi *mipi)
{
u32 value;
int err;
err = clk_enable(mipi->clk);
if (err < 0)
return err;
/*
* The MIPI_CAL_BIAS_PAD_PDVREG controls a voltage regulator that
* supplies the DSI pads. This must be kept enabled until none of the
* DSI lanes are used anymore.
*/
value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG2);
value |= MIPI_CAL_BIAS_PAD_PDVREG;
tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
/*
* MIPI_CAL_BIAS_PAD_PDVCLAMP and MIPI_CAL_BIAS_PAD_E_VCLAMP_REF
* control a regulator that supplies current to the pre-driver logic.
* Powering down this regulator causes DSI to fail, so it must remain
* powered on until none of the DSI lanes are used anymore.
*/
value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG0);
if (mipi->soc->needs_vclamp_ref)
value &= ~MIPI_CAL_BIAS_PAD_E_VCLAMP_REF;
value |= MIPI_CAL_BIAS_PAD_PDVCLAMP;
tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG0);
return 0;
}
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) {
err = -ENOMEM;
goto out;
}
dev->pdev = of_find_device_by_node(args.np);
if (!dev->pdev) {
err = -ENODEV;
goto free;
}
dev->mipi = platform_get_drvdata(dev->pdev);
if (!dev->mipi) {
err = -EPROBE_DEFER;
goto put;
}
of_node_put(args.np);
dev->pads = args.args[0];
dev->device = device;
return dev;
put:
platform_device_put(dev->pdev);
free:
kfree(dev);
out:
of_node_put(args.np);
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);
int tegra_mipi_enable(struct tegra_mipi_device *dev)
{
int err = 0;
mutex_lock(&dev->mipi->lock);
if (dev->mipi->usage_count++ == 0)
err = tegra_mipi_power_up(dev->mipi);
mutex_unlock(&dev->mipi->lock);
return err;
}
EXPORT_SYMBOL(tegra_mipi_enable);
int tegra_mipi_disable(struct tegra_mipi_device *dev)
{
int err = 0;
mutex_lock(&dev->mipi->lock);
if (--dev->mipi->usage_count == 0)
err = tegra_mipi_power_down(dev->mipi);
mutex_unlock(&dev->mipi->lock);
return err;
}
EXPORT_SYMBOL(tegra_mipi_disable);
static int tegra_mipi_wait(struct tegra_mipi *mipi)
{
unsigned long timeout = jiffies + msecs_to_jiffies(250);
u32 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)
{
const struct tegra_mipi_soc *soc = device->mipi->soc;
unsigned int i;
u32 value;
int err;
err = clk_enable(device->mipi->clk);
if (err < 0)
return err;
mutex_lock(&device->mipi->lock);
value = MIPI_CAL_BIAS_PAD_DRV_DN_REF(soc->pad_drive_down_ref) |
MIPI_CAL_BIAS_PAD_DRV_UP_REF(soc->pad_drive_up_ref);
tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG1);
value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG2);
value &= ~MIPI_CAL_BIAS_PAD_VCLAMP(0x7);
value &= ~MIPI_CAL_BIAS_PAD_VAUXP(0x7);
value |= MIPI_CAL_BIAS_PAD_VCLAMP(soc->pad_vclamp_level);
value |= MIPI_CAL_BIAS_PAD_VAUXP(soc->pad_vauxp_level);
tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
for (i = 0; i < soc->num_pads; i++) {
u32 clk = 0, data = 0;
if (device->pads & BIT(i)) {
data = MIPI_CAL_CONFIG_SELECT |
MIPI_CAL_CONFIG_HSPDOS(soc->hspdos) |
MIPI_CAL_CONFIG_HSPUOS(soc->hspuos) |
MIPI_CAL_CONFIG_TERMOS(soc->termos);
clk = MIPI_CAL_CONFIG_SELECT |
MIPI_CAL_CONFIG_HSCLKPDOSD(soc->hsclkpdos) |
MIPI_CAL_CONFIG_HSCLKPUOSD(soc->hsclkpuos);
}
tegra_mipi_writel(device->mipi, data, soc->pads[i].data);
if (soc->has_clk_lane && soc->pads[i].clk != 0)
tegra_mipi_writel(device->mipi, clk, soc->pads[i].clk);
}
value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL);
value &= ~MIPI_CAL_CTRL_NOISE_FILTER(0xf);
value &= ~MIPI_CAL_CTRL_PRESCALE(0x3);
value |= MIPI_CAL_CTRL_NOISE_FILTER(0xa);
value |= MIPI_CAL_CTRL_PRESCALE(0x2);
if (!soc->clock_enable_override)
value &= ~MIPI_CAL_CTRL_CLKEN_OVR;
else
value |= MIPI_CAL_CTRL_CLKEN_OVR;
tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL);
/* clear any pending status bits */
value = tegra_mipi_readl(device->mipi, MIPI_CAL_STATUS);
tegra_mipi_writel(device->mipi, value, MIPI_CAL_STATUS);
value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL);
value |= MIPI_CAL_CTRL_START;
tegra_mipi_writel(device->mipi, value, 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 const struct tegra_mipi_pad tegra114_mipi_pads[] = {
{ .data = MIPI_CAL_CONFIG_CSIA },
{ .data = MIPI_CAL_CONFIG_CSIB },
{ .data = MIPI_CAL_CONFIG_CSIC },
{ .data = MIPI_CAL_CONFIG_CSID },
{ .data = MIPI_CAL_CONFIG_CSIE },
{ .data = MIPI_CAL_CONFIG_DSIA },
{ .data = MIPI_CAL_CONFIG_DSIB },
{ .data = MIPI_CAL_CONFIG_DSIC },
{ .data = MIPI_CAL_CONFIG_DSID },
};
static const struct tegra_mipi_soc tegra114_mipi_soc = {
.has_clk_lane = false,
.pads = tegra114_mipi_pads,
.num_pads = ARRAY_SIZE(tegra114_mipi_pads),
.clock_enable_override = true,
.needs_vclamp_ref = true,
.pad_drive_down_ref = 0x2,
.pad_drive_up_ref = 0x0,
.pad_vclamp_level = 0x0,
.pad_vauxp_level = 0x0,
.hspdos = 0x0,
.hspuos = 0x4,
.termos = 0x5,
.hsclkpdos = 0x0,
.hsclkpuos = 0x4,
};
static const struct tegra_mipi_pad tegra124_mipi_pads[] = {
{ .data = MIPI_CAL_CONFIG_CSIA, .clk = MIPI_CAL_CONFIG_CSIAB_CLK },
{ .data = MIPI_CAL_CONFIG_CSIB, .clk = MIPI_CAL_CONFIG_CSIAB_CLK },
{ .data = MIPI_CAL_CONFIG_CSIC, .clk = MIPI_CAL_CONFIG_CSICD_CLK },
{ .data = MIPI_CAL_CONFIG_CSID, .clk = MIPI_CAL_CONFIG_CSICD_CLK },
{ .data = MIPI_CAL_CONFIG_CSIE, .clk = MIPI_CAL_CONFIG_CSIE_CLK },
{ .data = MIPI_CAL_CONFIG_DSIA, .clk = MIPI_CAL_CONFIG_DSIA_CLK },
{ .data = MIPI_CAL_CONFIG_DSIB, .clk = MIPI_CAL_CONFIG_DSIB_CLK },
};
static const struct tegra_mipi_soc tegra124_mipi_soc = {
.has_clk_lane = true,
.pads = tegra124_mipi_pads,
.num_pads = ARRAY_SIZE(tegra124_mipi_pads),
.clock_enable_override = true,
.needs_vclamp_ref = true,
.pad_drive_down_ref = 0x2,
.pad_drive_up_ref = 0x0,
.pad_vclamp_level = 0x0,
.pad_vauxp_level = 0x0,
.hspdos = 0x0,
.hspuos = 0x0,
.termos = 0x0,
.hsclkpdos = 0x1,
.hsclkpuos = 0x2,
};
static const struct tegra_mipi_soc tegra132_mipi_soc = {
.has_clk_lane = true,
.pads = tegra124_mipi_pads,
.num_pads = ARRAY_SIZE(tegra124_mipi_pads),
.clock_enable_override = false,
.needs_vclamp_ref = false,
.pad_drive_down_ref = 0x0,
.pad_drive_up_ref = 0x3,
.pad_vclamp_level = 0x0,
.pad_vauxp_level = 0x0,
.hspdos = 0x0,
.hspuos = 0x0,
.termos = 0x0,
.hsclkpdos = 0x3,
.hsclkpuos = 0x2,
};
static const struct tegra_mipi_pad tegra210_mipi_pads[] = {
{ .data = MIPI_CAL_CONFIG_CSIA, .clk = 0 },
{ .data = MIPI_CAL_CONFIG_CSIB, .clk = 0 },
{ .data = MIPI_CAL_CONFIG_CSIC, .clk = 0 },
{ .data = MIPI_CAL_CONFIG_CSID, .clk = 0 },
{ .data = MIPI_CAL_CONFIG_CSIE, .clk = 0 },
{ .data = MIPI_CAL_CONFIG_CSIF, .clk = 0 },
{ .data = MIPI_CAL_CONFIG_DSIA, .clk = MIPI_CAL_CONFIG_DSIA_CLK },
{ .data = MIPI_CAL_CONFIG_DSIB, .clk = MIPI_CAL_CONFIG_DSIB_CLK },
{ .data = MIPI_CAL_CONFIG_DSIC, .clk = MIPI_CAL_CONFIG_DSIC_CLK },
{ .data = MIPI_CAL_CONFIG_DSID, .clk = MIPI_CAL_CONFIG_DSID_CLK },
};
static const struct tegra_mipi_soc tegra210_mipi_soc = {
.has_clk_lane = true,
.pads = tegra210_mipi_pads,
.num_pads = ARRAY_SIZE(tegra210_mipi_pads),
.clock_enable_override = true,
.needs_vclamp_ref = false,
.pad_drive_down_ref = 0x0,
.pad_drive_up_ref = 0x3,
.pad_vclamp_level = 0x1,
.pad_vauxp_level = 0x1,
.hspdos = 0x0,
.hspuos = 0x2,
.termos = 0x0,
.hsclkpdos = 0x0,
.hsclkpuos = 0x2,
};
static const struct of_device_id tegra_mipi_of_match[] = {
{ .compatible = "nvidia,tegra114-mipi", .data = &tegra114_mipi_soc },
{ .compatible = "nvidia,tegra124-mipi", .data = &tegra124_mipi_soc },
{ .compatible = "nvidia,tegra132-mipi", .data = &tegra132_mipi_soc },
{ .compatible = "nvidia,tegra210-mipi", .data = &tegra210_mipi_soc },
{ },
};
static int tegra_mipi_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
struct tegra_mipi *mipi;
struct resource *res;
int err;
match = of_match_node(tegra_mipi_of_match, pdev->dev.of_node);
if (!match)
return -ENODEV;
mipi = devm_kzalloc(&pdev->dev, sizeof(*mipi), GFP_KERNEL);
if (!mipi)
return -ENOMEM;
mipi->soc = match->data;
mipi->dev = &pdev->dev;
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;
}
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,
};