// SPDX-License-Identifier: GPL-2.0-only
/*
* Support for the camera device found on Marvell MMP processors; known
* to work with the Armada 610 as used in the OLPC 1.75 system.
*
* Copyright 2011 Jonathan Corbet <[email protected]>
* Copyright 2018 Lubomir Rintel <[email protected]>
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <linux/platform_data/media/mmp-camera.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/pm.h>
#include <linux/clk.h>
#include "mcam-core.h"
MODULE_ALIAS("platform:mmp-camera");
MODULE_AUTHOR("Jonathan Corbet <[email protected]>");
MODULE_DESCRIPTION("Support for the camera device found on Marvell MMP processors");
MODULE_LICENSE("GPL");
static char *mcam_clks[] = {"axi", "func", "phy"};
struct mmp_camera {
struct platform_device *pdev;
struct mcam_camera mcam;
struct list_head devlist;
struct clk *mipi_clk;
int irq;
};
static inline struct mmp_camera *mcam_to_cam(struct mcam_camera *mcam)
{
return container_of(mcam, struct mmp_camera, mcam);
}
/*
* calc the dphy register values
* There are three dphy registers being used.
* dphy[0] - CSI2_DPHY3
* dphy[1] - CSI2_DPHY5
* dphy[2] - CSI2_DPHY6
* CSI2_DPHY3 and CSI2_DPHY6 can be set with a default value
* or be calculated dynamically
*/
static void mmpcam_calc_dphy(struct mcam_camera *mcam)
{
struct mmp_camera *cam = mcam_to_cam(mcam);
struct mmp_camera_platform_data *pdata = cam->pdev->dev.platform_data;
struct device *dev = &cam->pdev->dev;
unsigned long tx_clk_esc;
/*
* If CSI2_DPHY3 is calculated dynamically,
* pdata->lane_clk should be already set
* either in the board driver statically
* or in the sensor driver dynamically.
*/
/*
* dphy[0] - CSI2_DPHY3:
* bit 0 ~ bit 7: HS Term Enable.
* defines the time that the DPHY
* wait before enabling the data
* lane termination after detecting
* that the sensor has driven the data
* lanes to the LP00 bridge state.
* The value is calculated by:
* (Max T(D_TERM_EN)/Period(DDR)) - 1
* bit 8 ~ bit 15: HS_SETTLE
* Time interval during which the HS
* receiver shall ignore any Data Lane
* HS transitions.
* The value has been calibrated on
* different boards. It seems to work well.
*
* More detail please refer
* MIPI Alliance Spectification for D-PHY
* document for explanation of HS-SETTLE
* and D-TERM-EN.
*/
switch (pdata->dphy3_algo) {
case DPHY3_ALGO_PXA910:
/*
* Calculate CSI2_DPHY3 algo for PXA910
*/
pdata->dphy[0] =
(((1 + (pdata->lane_clk * 80) / 1000) & 0xff) << 8)
| (1 + pdata->lane_clk * 35 / 1000);
break;
case DPHY3_ALGO_PXA2128:
/*
* Calculate CSI2_DPHY3 algo for PXA2128
*/
pdata->dphy[0] =
(((2 + (pdata->lane_clk * 110) / 1000) & 0xff) << 8)
| (1 + pdata->lane_clk * 35 / 1000);
break;
default:
/*
* Use default CSI2_DPHY3 value for PXA688/PXA988
*/
dev_dbg(dev, "camera: use the default CSI2_DPHY3 value\n");
}
/*
* mipi_clk will never be changed, it is a fixed value on MMP
*/
if (IS_ERR(cam->mipi_clk))
return;
/* get the escape clk, this is hard coded */
clk_prepare_enable(cam->mipi_clk);
tx_clk_esc = (clk_get_rate(cam->mipi_clk) / 1000000) / 12;
clk_disable_unprepare(cam->mipi_clk);
/*
* dphy[2] - CSI2_DPHY6:
* bit 0 ~ bit 7: CK Term Enable
* Time for the Clock Lane receiver to enable the HS line
* termination. The value is calculated similarly with
* HS Term Enable
* bit 8 ~ bit 15: CK Settle
* Time interval during which the HS receiver shall ignore
* any Clock Lane HS transitions.
* The value is calibrated on the boards.
*/
pdata->dphy[2] =
((((534 * tx_clk_esc) / 2000 - 1) & 0xff) << 8)
| (((38 * tx_clk_esc) / 1000 - 1) & 0xff);
dev_dbg(dev, "camera: DPHY sets: dphy3=0x%x, dphy5=0x%x, dphy6=0x%x\n",
pdata->dphy[0], pdata->dphy[1], pdata->dphy[2]);
}
static irqreturn_t mmpcam_irq(int irq, void *data)
{
struct mcam_camera *mcam = data;
unsigned int irqs, handled;
spin_lock(&mcam->dev_lock);
irqs = mcam_reg_read(mcam, REG_IRQSTAT);
handled = mccic_irq(mcam, irqs);
spin_unlock(&mcam->dev_lock);
return IRQ_RETVAL(handled);
}
static void mcam_init_clk(struct mcam_camera *mcam)
{
unsigned int i;
for (i = 0; i < NR_MCAM_CLK; i++) {
if (mcam_clks[i] != NULL) {
/* Some clks are not necessary on some boards
* We still try to run even it fails getting clk
*/
mcam->clk[i] = devm_clk_get(mcam->dev, mcam_clks[i]);
if (IS_ERR(mcam->clk[i]))
dev_warn(mcam->dev, "Could not get clk: %s\n",
mcam_clks[i]);
}
}
}
static int mmpcam_probe(struct platform_device *pdev)
{
struct mmp_camera *cam;
struct mcam_camera *mcam;
struct resource *res;
struct fwnode_handle *ep;
struct mmp_camera_platform_data *pdata;
struct v4l2_async_connection *asd;
int ret;
cam = devm_kzalloc(&pdev->dev, sizeof(*cam), GFP_KERNEL);
if (cam == NULL)
return -ENOMEM;
platform_set_drvdata(pdev, cam);
cam->pdev = pdev;
INIT_LIST_HEAD(&cam->devlist);
mcam = &cam->mcam;
mcam->calc_dphy = mmpcam_calc_dphy;
mcam->dev = &pdev->dev;
pdata = pdev->dev.platform_data;
if (pdata) {
mcam->mclk_src = pdata->mclk_src;
mcam->mclk_div = pdata->mclk_div;
mcam->bus_type = pdata->bus_type;
mcam->dphy = pdata->dphy;
mcam->lane = pdata->lane;
} else {
/*
* These are values that used to be hardcoded in mcam-core and
* work well on a OLPC XO 1.75 with a parallel bus sensor.
* If it turns out other setups make sense, the values should
* be obtained from the device tree.
*/
mcam->mclk_src = 3;
mcam->mclk_div = 2;
}
if (mcam->bus_type == V4L2_MBUS_CSI2_DPHY) {
cam->mipi_clk = devm_clk_get(mcam->dev, "mipi");
if ((IS_ERR(cam->mipi_clk) && mcam->dphy[2] == 0))
return PTR_ERR(cam->mipi_clk);
}
mcam->mipi_enabled = false;
mcam->chip_id = MCAM_ARMADA610;
mcam->buffer_mode = B_DMA_sg;
strscpy(mcam->bus_info, "platform:mmp-camera", sizeof(mcam->bus_info));
spin_lock_init(&mcam->dev_lock);
/*
* Get our I/O memory.
*/
mcam->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(mcam->regs))
return PTR_ERR(mcam->regs);
mcam->regs_size = resource_size(res);
mcam_init_clk(mcam);
/*
* Create a match of the sensor against its OF node.
*/
ep = fwnode_graph_get_next_endpoint(of_fwnode_handle(pdev->dev.of_node),
NULL);
if (!ep)
return -ENODEV;
v4l2_async_nf_init(&mcam->notifier, &mcam->v4l2_dev);
asd = v4l2_async_nf_add_fwnode_remote(&mcam->notifier, ep,
struct v4l2_async_connection);
fwnode_handle_put(ep);
if (IS_ERR(asd)) {
ret = PTR_ERR(asd);
goto out;
}
/*
* Register the device with the core.
*/
ret = mccic_register(mcam);
if (ret)
goto out;
/*
* Add OF clock provider.
*/
ret = of_clk_add_provider(pdev->dev.of_node, of_clk_src_simple_get,
mcam->mclk);
if (ret) {
dev_err(&pdev->dev, "can't add DT clock provider\n");
goto out;
}
/*
* Finally, set up our IRQ now that the core is ready to
* deal with it.
*/
ret = platform_get_irq(pdev, 0);
if (ret < 0)
goto out;
cam->irq = ret;
ret = devm_request_irq(&pdev->dev, cam->irq, mmpcam_irq, IRQF_SHARED,
"mmp-camera", mcam);
if (ret)
goto out;
pm_runtime_enable(&pdev->dev);
return 0;
out:
mccic_shutdown(mcam);
return ret;
}
static void mmpcam_remove(struct platform_device *pdev)
{
struct mmp_camera *cam = platform_get_drvdata(pdev);
struct mcam_camera *mcam = &cam->mcam;
mccic_shutdown(mcam);
pm_runtime_force_suspend(mcam->dev);
}
/*
* Suspend/resume support.
*/
static int __maybe_unused mmpcam_runtime_resume(struct device *dev)
{
struct mmp_camera *cam = dev_get_drvdata(dev);
struct mcam_camera *mcam = &cam->mcam;
unsigned int i;
for (i = 0; i < NR_MCAM_CLK; i++) {
if (!IS_ERR(mcam->clk[i]))
clk_prepare_enable(mcam->clk[i]);
}
return 0;
}
static int __maybe_unused mmpcam_runtime_suspend(struct device *dev)
{
struct mmp_camera *cam = dev_get_drvdata(dev);
struct mcam_camera *mcam = &cam->mcam;
int i;
for (i = NR_MCAM_CLK - 1; i >= 0; i--) {
if (!IS_ERR(mcam->clk[i]))
clk_disable_unprepare(mcam->clk[i]);
}
return 0;
}
static int __maybe_unused mmpcam_suspend(struct device *dev)
{
struct mmp_camera *cam = dev_get_drvdata(dev);
if (!pm_runtime_suspended(dev))
mccic_suspend(&cam->mcam);
return 0;
}
static int __maybe_unused mmpcam_resume(struct device *dev)
{
struct mmp_camera *cam = dev_get_drvdata(dev);
if (!pm_runtime_suspended(dev))
return mccic_resume(&cam->mcam);
return 0;
}
static const struct dev_pm_ops mmpcam_pm_ops = {
SET_RUNTIME_PM_OPS(mmpcam_runtime_suspend, mmpcam_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(mmpcam_suspend, mmpcam_resume)
};
static const struct of_device_id mmpcam_of_match[] = {
{ .compatible = "marvell,mmp2-ccic", },
{},
};
MODULE_DEVICE_TABLE(of, mmpcam_of_match);
static struct platform_driver mmpcam_driver = {
.probe = mmpcam_probe,
.remove_new = mmpcam_remove,
.driver = {
.name = "mmp-camera",
.of_match_table = mmpcam_of_match,
.pm = &mmpcam_pm_ops,
}
};
module_platform_driver(mmpcam_driver);
Codebase Browser
linux