diff options
| author | Hou Zhiqiang <b48286@freescale.com> | 2013-12-12 02:08:13 (GMT) |
|---|---|---|
| committer | Jose Rivera <German.Rivera@freescale.com> | 2014-03-13 21:08:08 (GMT) |
| commit | fce941b03e4fd7ba4fc32a61cf7e6d57ce3c8e91 (patch) | |
| tree | 27337b11fe5cb314e177f41c2a94eef21fd2f8d5 /drivers/spi | |
| parent | 135026cb0dc7ecff5c6846484265ea633b740ad2 (diff) | |
| download | linux-fsl-qoriq-fce941b03e4fd7ba4fc32a61cf7e6d57ce3c8e91.tar.xz | |
spi/fsl-espi: Add Power Management support for eSPI controller
Add PM support for eSPI controller using callback function suspend
and resume in .driver.pm of platform_driver.
Signed-off-by: Hou Zhiqiang <b48286@freescale.com>
Change-Id: Ibc1dbdbe830f136ffc26a3610f6a4a1581e0e8cb
Reviewed-on: http://git.am.freescale.net:8181/9579
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Mingkai Hu <Mingkai.Hu@freescale.com>
Reviewed-by: Jose Rivera <German.Rivera@freescale.com>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-fsl-espi.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c index 80d8f40..5ca6482 100644 --- a/drivers/spi/spi-fsl-espi.c +++ b/drivers/spi/spi-fsl-espi.c @@ -727,6 +727,66 @@ static int of_fsl_espi_remove(struct platform_device *dev) return mpc8xxx_spi_remove(&dev->dev); } +#ifdef CONFIG_PM_SLEEP +static int of_fsl_espi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mpc8xxx_spi *mpc8xxx_spi; + struct fsl_espi_reg *reg_base; + u32 regval; + int ret; + + mpc8xxx_spi = spi_master_get_devdata(master); + reg_base = mpc8xxx_spi->reg_base; + + ret = spi_master_suspend(master); + if (ret) { + dev_warn(dev, "cannot suspend master\n"); + return ret; + } + + regval = mpc8xxx_spi_read_reg(®_base->mode); + regval &= ~SPMODE_ENABLE; + mpc8xxx_spi_write_reg(®_base->mode, regval); + + return 0; +} + +static int of_fsl_espi_resume(struct device *dev) +{ + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct spi_master *master = dev_get_drvdata(dev); + struct mpc8xxx_spi *mpc8xxx_spi; + struct fsl_espi_reg *reg_base; + u32 regval; + int i; + + mpc8xxx_spi = spi_master_get_devdata(master); + reg_base = mpc8xxx_spi->reg_base; + + /* SPI controller initializations */ + mpc8xxx_spi_write_reg(®_base->mode, 0); + mpc8xxx_spi_write_reg(®_base->mask, 0); + mpc8xxx_spi_write_reg(®_base->command, 0); + mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); + + /* Init eSPI CS mode register */ + for (i = 0; i < pdata->max_chipselect; i++) + mpc8xxx_spi_write_reg(®_base->csmode[i], CSMODE_INIT_VAL); + + /* Enable SPI interface */ + regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; + + mpc8xxx_spi_write_reg(®_base->mode, regval); + + return spi_master_resume(master); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops espi_pm = { + SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume) +}; + static const struct of_device_id of_fsl_espi_match[] = { { .compatible = "fsl,mpc8536-espi" }, {} @@ -738,6 +798,7 @@ static struct platform_driver fsl_espi_driver = { .name = "fsl_espi", .owner = THIS_MODULE, .of_match_table = of_fsl_espi_match, + .pm = &espi_pm, }, .probe = of_fsl_espi_probe, .remove = of_fsl_espi_remove, |