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serial: xilinx_uartps: Add pm runtime support

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Adds pm runtime support to xilinx uart ps.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shubhrajyoti Datta 2017-03-09 11:19:07 +05:30 committed by Greg Kroah-Hartman
parent f48180a70e
commit d62100f1aa
1 changed files with 42 additions and 8 deletions
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50
drivers/tty/serial/xilinx_uartps.c
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@ -30,6 +30,7 @@
#include <linux/io.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#define CDNS_UART_TTY_NAME "ttyPS"
#define CDNS_UART_NAME "xuartps"
@ -176,6 +177,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
#define CDNS_UART_BDIV_MIN 4
#define CDNS_UART_BDIV_MAX 255
#define CDNS_UART_CD_MAX 65535
#define UART_AUTOSUSPEND_TIMEOUT 3000
/**
* struct cdns_uart - device data
@ -1065,16 +1067,13 @@ static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c)
static void cdns_uart_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
struct cdns_uart *cdns_uart = port->private_data;
switch (state) {
case UART_PM_STATE_OFF:
clk_disable(cdns_uart->uartclk);
clk_disable(cdns_uart->pclk);
pm_runtime_mark_last_busy(port->dev);
pm_runtime_put_autosuspend(port->dev);
break;
default:
clk_enable(cdns_uart->pclk);
clk_enable(cdns_uart->uartclk);
pm_runtime_get_sync(port->dev);
break;
}
}
@ -1436,9 +1435,33 @@ static int cdns_uart_resume(struct device *device)
return uart_resume_port(&cdns_uart_uart_driver, port);
}
#endif /* ! CONFIG_PM_SLEEP */
static int __maybe_unused cdns_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct uart_port *port = platform_get_drvdata(pdev);
struct cdns_uart *cdns_uart = port->private_data;
static SIMPLE_DEV_PM_OPS(cdns_uart_dev_pm_ops, cdns_uart_suspend,
cdns_uart_resume);
clk_disable(cdns_uart->uartclk);
clk_disable(cdns_uart->pclk);
return 0;
};
static int __maybe_unused cdns_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct uart_port *port = platform_get_drvdata(pdev);
struct cdns_uart *cdns_uart = port->private_data;
clk_enable(cdns_uart->pclk);
clk_enable(cdns_uart->uartclk);
return 0;
};
static const struct dev_pm_ops cdns_uart_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(cdns_uart_suspend, cdns_uart_resume)
SET_RUNTIME_PM_OPS(cdns_runtime_suspend,
cdns_runtime_resume, NULL)
};
static const struct cdns_platform_data zynqmp_uart_def = {
.quirks = CDNS_UART_RXBS_SUPPORT, };
@ -1558,6 +1581,11 @@ static int cdns_uart_probe(struct platform_device *pdev)
cdns_uart_data->port = port;
platform_set_drvdata(pdev, port);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT);
pm_runtime_enable(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
rc = uart_add_one_port(&cdns_uart_uart_driver, port);
if (rc) {
dev_err(&pdev->dev,
@ -1573,6 +1601,9 @@ err_out_notif_unreg:
&cdns_uart_data->clk_rate_change_nb);
#endif
err_out_clk_disable:
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
clk_unprepare(cdns_uart_data->uartclk);
err_out_clk_dis_pclk:
clk_unprepare(cdns_uart_data->pclk);
@ -1601,6 +1632,9 @@ static int cdns_uart_remove(struct platform_device *pdev)
port->mapbase = 0;
clk_unprepare(cdns_uart_data->uartclk);
clk_unprepare(cdns_uart_data->pclk);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
return rc;
}