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Date: Tue, 20 May 2014 14:34:20 +0200
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To: Antoine Ténart
<antoine.tenart@...e-electrons.com>
Cc: sebastian.hesselbarth@...il.com, tj@...nel.org, kishon@...com,
alexandre.belloni@...e-electrons.com,
thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
jszhang@...vell.com, linux-arm-kernel@...ts.infradead.org,
linux-ide@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/7] phy: add a driver for the Berlin SATA PHY
Hi,
Few minor issues below..
On Tuesday, May 20, 2014 11:04:29 AM Antoine Ténart wrote:
> The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
>
> The mode selection can let us think this PHY can be configured to fit
> other purposes. But there are reasons to think the SATA mode will be
> the only one usable: the PHY registers are only accessible indirectly
> through two registers in the SATA range, the PHY seems to be integrated
> and no information tells us the contrary. For these reasons, make the
> driver a SATA PHY driver.
>
> Signed-off-by: Antoine Ténart <antoine.tenart@...e-electrons.com>
> ---
> drivers/phy/Kconfig | 5 +
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-berlin-sata.c | 230 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 236 insertions(+)
> create mode 100644 drivers/phy/phy-berlin-sata.c
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 4906c27fa3bd..b31b1986fda4 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -15,6 +15,11 @@ config GENERIC_PHY
> phy users can obtain reference to the PHY. All the users of this
> framework should select this config.
>
> +config PHY_BERLIN_SATA
> + bool
Is there any real reason why this cannot be tristate?
> + depends on ARCH_BERLIN && OF
> + select GENERIC_PHY
> +
> config PHY_EXYNOS_MIPI_VIDEO
> tristate "S5P/EXYNOS SoC series MIPI CSI-2/DSI PHY driver"
> depends on HAS_IOMEM
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 7728518572a4..40278706ac1b 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -3,6 +3,7 @@
> #
>
> obj-$(CONFIG_GENERIC_PHY) += phy-core.o
> +obj-$(CONFIG_PHY_BERLIN_SATA) += phy-berlin-sata.o
> obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o
> obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o
> obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o
> diff --git a/drivers/phy/phy-berlin-sata.c b/drivers/phy/phy-berlin-sata.c
> new file mode 100644
> index 000000000000..597f008cae32
> --- /dev/null
> +++ b/drivers/phy/phy-berlin-sata.c
> @@ -0,0 +1,230 @@
> +/*
> + * Marvell Berlin SATA PHY driver
> + *
> + * Copyright (C) 2014 Marvell Technology Group Ltd.
> + *
> + * Antoine Ténart <antoine.tenart@...e-electrons.com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/phy/phy.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +
> +#define HOST_VSA_ADDR 0x0
> +#define HOST_VSA_DATA 0x4
> +#define PORT_VSR_ADDR 0x78
> +#define PORT_VSR_DATA 0x7c
> +#define PORT_SCR_CTL 0x2c
> +
> +#define CONTROL_REGISTER 0x0
> +#define MBUS_SIZE_CONTROL 0x4
> +
> +#define POWER_DOWN_PHY0 BIT(6)
> +#define POWER_DOWN_PHY1 BIT(14)
> +#define MBUS_WRITE_REQUEST_SIZE_128 (BIT(2) << 16)
> +#define MBUS_READ_REQUEST_SIZE_128 (BIT(2) << 19)
> +
> +#define PHY_BASE 0x200
> +
> +/* register 0x01 */
> +#define REF_FREF_SEL_25 BIT(0)
> +#define PHY_MODE_SATA (0x0 << 5)
> +
> +/* register 0x02 */
> +#define USE_MAX_PLL_RATE BIT(12)
> +
> +/* register 0x23 */
> +#define DATA_BIT_WIDTH_10 (0x0 << 10)
> +#define DATA_BIT_WIDTH_20 (0x1 << 10)
> +#define DATA_BIT_WIDTH_40 (0x2 << 10)
> +
> +/* register 0x25 */
> +#define PHY_GEN_MAX_1_5 (0x0 << 10)
> +#define PHY_GEN_MAX_3_0 (0x1 << 10)
> +#define PHY_GEN_MAX_6_0 (0x2 << 10)
> +
> +#define BERLIN_SATA_PHY_NB 2
> +
> +#define to_berlin_sata_phy_priv(desc) \
> + container_of((desc), struct phy_berlin_priv, phys[(desc)->index])
> +
> +struct phy_berlin_desc {
> + struct phy *phy;
> + u32 val;
> + unsigned index;
> +};
> +
> +struct phy_berlin_priv {
> + void __iomem *base;
> + spinlock_t lock;
> + struct phy_berlin_desc phys[BERLIN_SATA_PHY_NB];
> +};
> +
> +static inline void phy_berlin_sata_reg_setbits(void __iomem *ctrl_reg, u32 reg,
> + u32 mask, u32 val)
> +{
> + u32 regval;
> +
> + /* select register */
> + writel(PHY_BASE + reg, ctrl_reg + PORT_VSR_ADDR);
> +
> + /* set bits */
> + regval = readl(ctrl_reg + PORT_VSR_DATA);
> + regval &= ~mask;
> + regval |= val;
> + writel(regval, ctrl_reg + PORT_VSR_DATA);
> +}
> +
> +static int phy_berlin_sata_power_on(struct phy *phy)
> +{
> + struct phy_berlin_desc *desc = phy_get_drvdata(phy);
> + struct phy_berlin_priv *priv = to_berlin_sata_phy_priv(desc);
> + void __iomem *ctrl_reg = priv->base + 0x60 + (desc->index * 0x80);
> + int ret = 0;
> + u32 regval;
> +
> + spin_lock(&priv->lock);
> +
> + /* Power on PHY */
> + writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
> + regval = readl(priv->base + HOST_VSA_DATA);
> + regval &= ~(desc->val);
> + writel(regval, priv->base + HOST_VSA_DATA);
> +
> + /* Configure MBus */
> + writel(MBUS_SIZE_CONTROL, priv->base + HOST_VSA_ADDR);
> + regval = readl(priv->base + HOST_VSA_DATA);
> + regval |= MBUS_WRITE_REQUEST_SIZE_128 | MBUS_READ_REQUEST_SIZE_128;
> + writel(regval, priv->base + HOST_VSA_DATA);
> +
> + /* set PHY mode and ref freq to 25 MHz */
> + phy_berlin_sata_reg_setbits(ctrl_reg, 0x1, 0xff,
> + REF_FREF_SEL_25 | PHY_MODE_SATA);
> +
> + /* set PHY up to 6 Gbps */
> + phy_berlin_sata_reg_setbits(ctrl_reg, 0x25, 0xc00, PHY_GEN_MAX_6_0);
> +
> + /* set 40 bits width */
> + phy_berlin_sata_reg_setbits(ctrl_reg, 0x23, 0xc00, DATA_BIT_WIDTH_40);
> +
> + /* use max pll rate */
> + phy_berlin_sata_reg_setbits(ctrl_reg, 0x2, 0x0, USE_MAX_PLL_RATE);
> +
> + /* set the controller speed */
> + writel(0x31, ctrl_reg + PORT_SCR_CTL);
> +
> + spin_unlock(&priv->lock);
> +
> + return ret;
> +}
> +
> +static int phy_berlin_sata_power_off(struct phy *phy)
> +{
> + struct phy_berlin_desc *desc = phy_get_drvdata(phy);
> + struct phy_berlin_priv *priv = to_berlin_sata_phy_priv(desc);
> + u32 regval;
> +
> + spin_lock(&priv->lock);
> +
> + /* Power down PHY */
> + writel(CONTROL_REGISTER, priv->base + HOST_VSA_ADDR);
> + regval = readl(priv->base + HOST_VSA_DATA);
> + regval |= desc->val;
> + writel(regval, priv->base + HOST_VSA_DATA);
> +
> + spin_unlock(&priv->lock);
> +
> + return 0;
> +}
> +
> +static struct phy *phy_berlin_sata_phy_xlate(struct device *dev,
> + struct of_phandle_args *args)
> +{
> + struct phy_berlin_priv *priv = dev_get_drvdata(dev);
> +
> + if (WARN_ON(args->args[0] >= BERLIN_SATA_PHY_NB))
> + return ERR_PTR(-ENODEV);
> +
> + return priv->phys[args->args[0]].phy;
> +}
> +
> +static struct phy_ops phy_berlin_sata_ops = {
> + .power_on = phy_berlin_sata_power_on,
> + .power_off = phy_berlin_sata_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static struct phy_berlin_desc desc[] = {
> + { .val = POWER_DOWN_PHY0 },
> + { .val = POWER_DOWN_PHY1 },
Only .val entry of struct phy_berlin_desc is initialized and needed,
it seems that u32 vals[] should be used instead of desc[].
> + { },
> +};
> +
> +static int phy_berlin_sata_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct phy *phy;
> + struct phy_provider *phy_provider;
> + struct phy_berlin_priv *priv;
> + struct resource *res;
> + int i;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + priv->base = devm_ioremap(dev, res->start, resource_size(res));
> + if (IS_ERR(priv->base))
> + return PTR_ERR(priv->base);
devm_ioremap() (contrary to devm_ioremap_resource()) returns a valid
pointer or NULL so return value checking should be fixed.
> + dev_set_drvdata(dev, priv);
> + spin_lock_init(&priv->lock);
> +
> + for (i = 0; i < BERLIN_SATA_PHY_NB; i++) {
> + phy = devm_phy_create(dev, &phy_berlin_sata_ops, NULL);
> + if (IS_ERR(phy)) {
> + dev_err(dev, "failed to create PHY %d\n", i);
> + return PTR_ERR(phy);
> + }
> +
> + priv->phys[i].phy = phy;
> + priv->phys[i].val = desc[i].val;
> + priv->phys[i].index = i;
> + phy_set_drvdata(phy, &priv->phys[i]);
> +
> + /* Make sure the PHY is off */
> + phy_berlin_sata_power_off(phy);
> + }
> +
> + phy_provider =
> + devm_of_phy_provider_register(dev, phy_berlin_sata_phy_xlate);
> + if (IS_ERR(phy_provider))
> + return PTR_ERR(phy_provider);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id phy_berlin_sata_of_match[] = {
> + { .compatible = "marvell,berlin-sata-phy" },
> + { },
> +};
> +
> +static struct platform_driver phy_berlin_sata_driver = {
> + .probe = phy_berlin_sata_probe,
> + .driver = {
> + .name = "phy-berlin-sata",
> + .owner = THIS_MODULE,
> + .of_match_table = phy_berlin_sata_of_match,
> + },
> +};
> +module_platform_driver(phy_berlin_sata_driver);
> +
> +MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver");
> +MODULE_AUTHOR("Antoine Ténart <antoine.tenart@...e-electrons.com>");
> +MODULE_LICENSE("GPL v2");
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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