Hi, On Tuesday, October 01, 2013 12:03:01 PM Yuvaraj Kumar C D wrote: > Exynos5250 contains one Synopsys AHCI SATA controller.The avalaible > ahci_platform driver is not sufficient to handle the AHCI PHY and PHY > clock related initialization. > > This patch adds exynos specific ahci sata driver,contained the exynos > specific initialized codes, re-use the generic ahci_platform driver, and > keep the generic ahci_platform driver clean as much as possible. > > This patch depends on the below patch > [1].drivers: phy: add generic PHY framework > by Kishon Vijay Abraham I<kis...@ti.com> > > Signed-off-by: Yuvaraj Kumar C D <yuvaraj...@samsung.com> > --- > drivers/ata/Kconfig | 9 ++ > drivers/ata/Makefile | 1 + > drivers/ata/ahci_exynos.c | 226 > +++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 236 insertions(+) > create mode 100644 drivers/ata/ahci_exynos.c > > diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig > index 4e73772..99b2392 100644 > --- a/drivers/ata/Kconfig > +++ b/drivers/ata/Kconfig > @@ -106,6 +106,15 @@ config AHCI_IMX > > If unsure, say N. > > +config AHCI_EXYNOS > + tristate "Samsung Exynos AHCI SATA support" > + depends on SATA_AHCI_PLATFORM
This should also depend on SOC_EXYNOS5250. > + help > + This option enables support for the Samsung's Exynos SoC's > + onboard AHCI SATA. > + > + If unsure, say N. > + > config SATA_FSL > tristate "Freescale 3.0Gbps SATA support" > depends on FSL_SOC > diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile > index 46518c6..0e1f420f 100644 > --- a/drivers/ata/Makefile > +++ b/drivers/ata/Makefile > @@ -11,6 +11,7 @@ obj-$(CONFIG_SATA_SIL24) += sata_sil24.o > obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o > obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o libahci.o > obj-$(CONFIG_AHCI_IMX) += ahci_imx.o > +obj-$(CONFIG_AHCI_EXYNOS) += ahci_exynos.o > > # SFF w/ custom DMA > obj-$(CONFIG_PDC_ADMA) += pdc_adma.o > diff --git a/drivers/ata/ahci_exynos.c b/drivers/ata/ahci_exynos.c > new file mode 100644 > index 0000000..7f0af00 > --- /dev/null > +++ b/drivers/ata/ahci_exynos.c > @@ -0,0 +1,226 @@ > +/* > + * Samsung AHCI SATA platform driver > + * Copyright 2013 Samsung Electronics Co., Ltd. > + * > + * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms and conditions of the GNU General Public License, > + * version 2, as published by the Free Software Foundation. > + * > + * This program is distributed in the hope it will be useful, but WITHOUT > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for > + * more details. > + * > + * You should have received a copy of the GNU General Public License along > with > + * this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/i2c.h> This include doesn't seem to be needed. > +#include <linux/io.h> > +#include <linux/ahci_platform.h> > +#include <linux/of_device.h> > +#include <linux/phy/phy.h> > +#include "ahci.h" > + > +#define MHZ (1000 * 1000) > + > +struct exynos_ahci_priv { > + struct platform_device *ahci_pdev; > + struct clk *sclk; > + unsigned int freq; > + struct phy *phy; > +}; > + > +static int exynos_sata_init(struct device *dev, void __iomem *mmio) > +{ > + struct exynos_ahci_priv *priv = dev_get_drvdata(dev->parent); > + int ret; > + > + priv->phy = devm_phy_get(dev , "sata-phy"); > + if (IS_ERR(priv->phy)) > + return PTR_ERR(priv->phy); This should happen in ->probe (exynos_sata_init() is also called in exynos_sata_resume() so the above code will be executed on every resume operation which is incorrect). Also please take a look at the following patch: https://lkml.org/lkml/2013/9/19/173 it adds PHY support to ahci_platform driver, maybe it can be used for your needs as well. > + ret = phy_init(priv->phy); > + if (ret < 0) { > + dev_err(dev, "failed to init SATA PHY\n"); > + return ret; > + } > + > + ret = clk_prepare_enable(priv->sclk); > + if (ret < 0) { > + dev_err(dev, "failed to enable source clk\n"); > + return ret; > + } > + > + ret = clk_set_rate(priv->sclk, priv->freq * MHZ); > + if (ret < 0) { > + dev_err(dev, "failed to set clk frequency\n"); > + clk_disable_unprepare(priv->sclk); > + return ret; > + } > + > + return 0; > +} > + > +static void exynos_sata_exit(struct device *dev) > +{ > + struct exynos_ahci_priv *priv = dev_get_drvdata(dev->parent); > + if (!IS_ERR(priv->sclk)) > + clk_disable_unprepare(priv->sclk); > +} > + > +static int exynos_sata_suspend(struct device *dev) > +{ > + struct exynos_ahci_priv *priv = dev_get_drvdata(dev->parent); > + > + if (!IS_ERR(priv->sclk)) > + clk_disable_unprepare(priv->sclk); > + phy_power_off(priv->phy); > + return 0; > +} > + > +static int exynos_sata_resume(struct device *dev) > +{ > + struct exynos_ahci_priv *priv = dev_get_drvdata(dev->parent); > + phy_power_on(priv->phy); > + exynos_sata_init(dev, NULL); > + return 0; It should be: return exynos_sata_init(dev, NULL); Also please fix exynos_sata_suspend() to call exynos_sata_exit(). [...] Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
