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

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
......@@ -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);
......
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