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Unverified Commit 9e3a0003 authored by Naga Sureshkumar Relli's avatar Naga Sureshkumar Relli Committed by Mark Brown
Browse files

spi: zynqmp: Add pm runtime support 



This patch adds runtime pm functions.

Signed-off-by: default avatarShubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: default avatarNaga Sureshkumar Relli <nagasure@xilinx.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 51093cba

drivers/spi/spi-zynqmp-gqspi.c

+70 −16
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/of_irq.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/spi/spi.h>

#include <linux/spinlock.h>

#include <linux/workqueue.h>
@@ -135,6 +136,7 @@ 
#define GQSPI_DMA_UNALIGN		0x3

#define GQSPI_DEFAULT_NUM_CS	1	/* Default number of chip selects */



#define SPI_AUTOSUSPEND_TIMEOUT		3000

enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};



/**
@@ -356,21 +358,9 @@ static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi, 
static int zynqmp_prepare_transfer_hardware(struct spi_master *master)

{

	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);

	int ret;



	ret = clk_enable(xqspi->refclk);

	if (ret)

		return ret;



	ret = clk_enable(xqspi->pclk);

	if (ret)

		goto clk_err;



	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);

	return 0;

clk_err:

	clk_disable(xqspi->refclk);

	return ret;

}



/**
@@ -387,8 +377,6 @@ static int zynqmp_unprepare_transfer_hardware(struct spi_master *master) 
	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);



	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);

	clk_disable(xqspi->refclk);

	clk_disable(xqspi->pclk);

	return 0;

}
@@ -959,11 +947,67 @@ static int __maybe_unused zynqmp_qspi_resume(struct device *dev) 


	spi_master_resume(master);



	clk_disable(xqspi->refclk);

	clk_disable(xqspi->pclk);

	return 0;

}



static SIMPLE_DEV_PM_OPS(zynqmp_qspi_dev_pm_ops, zynqmp_qspi_suspend,

			 zynqmp_qspi_resume);

/**

 * zynqmp_runtime_suspend - Runtime suspend method for the SPI driver

 * @dev:	Address of the platform_device structure

 *

 * This function disables the clocks

 *

 * Return:	Always 0

 */

static int __maybe_unused zynqmp_runtime_suspend(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct spi_master *master = platform_get_drvdata(pdev);

	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);



	clk_disable(xqspi->refclk);

	clk_disable(xqspi->pclk);



	return 0;

}



/**

 * zynqmp_runtime_resume - Runtime resume method for the SPI driver

 * @dev:	Address of the platform_device structure

 *

 * This function enables the clocks

 *

 * Return:	0 on success and error value on error

 */

static int __maybe_unused zynqmp_runtime_resume(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct spi_master *master = platform_get_drvdata(pdev);

	struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);

	int ret;



	ret = clk_enable(xqspi->pclk);

	if (ret) {

		dev_err(dev, "Cannot enable APB clock.\n");

		return ret;

	}



	ret = clk_enable(xqspi->refclk);

	if (ret) {

		dev_err(dev, "Cannot enable device clock.\n");

		clk_disable(xqspi->pclk);

		return ret;

	}



	return 0;

}



static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = {

	SET_RUNTIME_PM_OPS(zynqmp_runtime_suspend,

			   zynqmp_runtime_resume, NULL)

	SET_SYSTEM_SLEEP_PM_OPS(zynqmp_qspi_suspend, zynqmp_qspi_resume)

};



/**

 * zynqmp_qspi_probe:	Probe method for the QSPI driver
@@ -1023,9 +1067,15 @@ static int zynqmp_qspi_probe(struct platform_device *pdev) 
		goto clk_dis_pclk;

	}



	pm_runtime_use_autosuspend(&pdev->dev);

	pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);

	pm_runtime_set_active(&pdev->dev);

	pm_runtime_enable(&pdev->dev);

	/* QSPI controller initializations */

	zynqmp_qspi_init_hw(xqspi);



	pm_runtime_mark_last_busy(&pdev->dev);

	pm_runtime_put_autosuspend(&pdev->dev);

	xqspi->irq = platform_get_irq(pdev, 0);

	if (xqspi->irq <= 0) {

		ret = -ENXIO;
@@ -1063,6 +1113,8 @@ static int zynqmp_qspi_probe(struct platform_device *pdev) 
	return 0;



clk_dis_all:

	pm_runtime_set_suspended(&pdev->dev);

	pm_runtime_disable(&pdev->dev);

	clk_disable_unprepare(xqspi->refclk);

clk_dis_pclk:

	clk_disable_unprepare(xqspi->pclk);
@@ -1090,6 +1142,8 @@ static int zynqmp_qspi_remove(struct platform_device *pdev) 
	zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);

	clk_disable_unprepare(xqspi->refclk);

	clk_disable_unprepare(xqspi->pclk);

	pm_runtime_set_suspended(&pdev->dev);

	pm_runtime_disable(&pdev->dev);



	spi_unregister_master(master);