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Date: Wed, 2 Jul 2014 16:46:37 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Antoine Ténart
<antoine.tenart@...e-electrons.com>,
<sebastian.hesselbarth@...il.com>, <tj@...nel.org>
CC: <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 v8 1/7] phy: add a driver for the Berlin SATA PHY
Hi,
On Monday 30 June 2014 06:39 PM, 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 | 7 ++
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-berlin-sata.c | 262 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 270 insertions(+)
> create mode 100644 drivers/phy/phy-berlin-sata.c
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 16a2f067c242..365ad3651e1c 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -15,6 +15,13 @@ 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
> + tristate "Marvell Berlin SATA PHY driver"
> + depends on ARCH_BERLIN && OF
depends on HAS_IOMEM?
> + select GENERIC_PHY
> + help
> + Enable this to support the SATA PHY on Marvell Berlin SoCs.
> +
> 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 b4f1d5770601..a137a2e23218 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..4446e93e6d82
> --- /dev/null
> +++ b/drivers/phy/phy-berlin-sata.c
> @@ -0,0 +1,262 @@
> +/*
> + * 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/clk.h>
> +#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_SCR_CTL 0x2c
> +#define PORT_VSR_ADDR 0x78
> +#define PORT_VSR_DATA 0x7c
> +
> +#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])
You can get rid of this and use dev_get_drvdata(phy->dev->parent);
> +
> +struct phy_berlin_desc {
> + struct phy *phy;
> + u32 power_bit;
> + unsigned index;
> +};
> +
> +struct phy_berlin_priv {
> + void __iomem *base;
> + spinlock_t lock;
> + struct clk *clk;
> + struct phy_berlin_desc phys[BERLIN_SATA_PHY_NB];
Avoid using fixed array sizes for ports or channels. Refer [1].
[1] -> http://www.spinics.net/lists/linux-sh/msg33350.html
Thanks
Kishon
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