[PATCH v2 0/2] ata: ahci-dm816: new driver

[PATCH v2 0/2] ata: ahci-dm816: new driver

[Bartosz Golaszewski]

Add support for the on-board SATA controller present on TI DM816 SoCs.

This IP suffers from the same issue DA850 does, that is: if we enable
PMP, but connect the drive directly to the board, the disk cannot be
detected. A workaround similar to the one implemented in ahci-da850 is
included in this driver as well.

Tested on DM8168-EVM.

v1 -> v2:
  PATCH 1/2
    - fixed the size of the mapped register region in the example
    - rephrased the clocks property description

Bartosz Golaszewski (2):
  dt-bindings: ata: add DT bindings for ahci-dm816 SATA controller
  ata: ahci: add support for DaVinci DM816 SATA controller

 .../devicetree/bindings/ata/ahci-dm816.txt         |  21 +++
 drivers/ata/Kconfig                                |   9 +
 drivers/ata/Makefile                               |   1 +
 drivers/ata/ahci_dm816.c                           | 200 +++++++++++++++++++++
 4 files changed, 231 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/ata/ahci-dm816.txt
 create mode 100644 drivers/ata/ahci_dm816.c

-- 
2.9.3

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[PATCH v2 0/2] ata: ahci-dm816: new driver

[Bartosz Golaszewski]

Add support for the on-board SATA controller present on TI DM816 SoCs.

This IP suffers from the same issue DA850 does, that is: if we enable
PMP, but connect the drive directly to the board, the disk cannot be
detected. A workaround similar to the one implemented in ahci-da850 is
included in this driver as well.

Tested on DM8168-EVM.

v1 -> v2:
  PATCH 1/2
    - fixed the size of the mapped register region in the example
    - rephrased the clocks property description

Bartosz Golaszewski (2):
  dt-bindings: ata: add DT bindings for ahci-dm816 SATA controller
  ata: ahci: add support for DaVinci DM816 SATA controller

 .../devicetree/bindings/ata/ahci-dm816.txt         |  21 +++
 drivers/ata/Kconfig                                |   9 +
 drivers/ata/Makefile                               |   1 +
 drivers/ata/ahci_dm816.c                           | 200 +++++++++++++++++++++
 4 files changed, 231 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/ata/ahci-dm816.txt
 create mode 100644 drivers/ata/ahci_dm816.c

-- 
2.9.3

[PATCH v2 1/2] dt-bindings: ata: add DT bindings for ahci-dm816 SATA controller

[Bartosz Golaszewski]

Add DT bindings for the onboard SATA controller present on the DM816x
SoCs.

Signed-off-by: Bartosz Golaszewski <bgolaszewski-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
---
 .../devicetree/bindings/ata/ahci-dm816.txt          | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/ata/ahci-dm816.txt

diff --git a/Documentation/devicetree/bindings/ata/ahci-dm816.txt b/Documentation/devicetree/bindings/ata/ahci-dm816.txt
new file mode 100644
index 0000000..f8c535f
--- /dev/null
+++ b/Documentation/devicetree/bindings/ata/ahci-dm816.txt
@@ -0,0 +1,21 @@
+Device tree binding for the TI DM816 AHCI SATA Controller
+---------------------------------------------------------
+
+Required properties:
+  - compatible: must be "ti,dm816-ahci"
+  - reg: physical base address and size of the register region used by
+         the controller (as defined by the AHCI 1.1 standard)
+  - interrupts: interrupt specifier (refer to the interrupt binding)
+  - clocks: list of phandle and clock specifier pairs (or only
+            phandles for clock providers with '0' defined for
+            #clock-cells); two clocks must be specified: the functional
+            clock and an external reference clock
+
+Example:
+
+	sata: sata@4a140000 {
+		compatible = "ti,dm816-ahci";
+		reg = <0x4a140000 0x10000>;
+		interrupts = <16>;
+		clocks = <&sysclk5_ck>, <&sata_refclk>;
+	};
-- 
2.9.3

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[PATCH v2 1/2] dt-bindings: ata: add DT bindings for ahci-dm816 SATA controller

[Bartosz Golaszewski]

Add DT bindings for the onboard SATA controller present on the DM816x
SoCs.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 .../devicetree/bindings/ata/ahci-dm816.txt          | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/ata/ahci-dm816.txt

diff --git a/Documentation/devicetree/bindings/ata/ahci-dm816.txt b/Documentation/devicetree/bindings/ata/ahci-dm816.txt
new file mode 100644
index 0000000..f8c535f
--- /dev/null
+++ b/Documentation/devicetree/bindings/ata/ahci-dm816.txt
@@ -0,0 +1,21 @@
+Device tree binding for the TI DM816 AHCI SATA Controller
+---------------------------------------------------------
+
+Required properties:
+  - compatible: must be "ti,dm816-ahci"
+  - reg: physical base address and size of the register region used by
+         the controller (as defined by the AHCI 1.1 standard)
+  - interrupts: interrupt specifier (refer to the interrupt binding)
+  - clocks: list of phandle and clock specifier pairs (or only
+            phandles for clock providers with '0' defined for
+            #clock-cells); two clocks must be specified: the functional
+            clock and an external reference clock
+
+Example:
+
+	sata: sata@4a140000 {
+		compatible = "ti,dm816-ahci";
+		reg = <0x4a140000 0x10000>;
+		interrupts = <16>;
+		clocks = <&sysclk5_ck>, <&sata_refclk>;
+	};
-- 
2.9.3

Re: [PATCH v2 1/2] dt-bindings: ata: add DT bindings for ahci-dm816 SATA controller

[Rob Herring]

On Tue, Mar 14, 2017 at 12:04:50PM +0100, Bartosz Golaszewski wrote:
> Add DT bindings for the onboard SATA controller present on the DM816x
> SoCs.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>  .../devicetree/bindings/ata/ahci-dm816.txt          | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/ata/ahci-dm816.txt

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v2 1/2] dt-bindings: ata: add DT bindings for ahci-dm816 SATA controller

[Bartosz Golaszewski]

2017-03-14 12:04 GMT+01:00 Bartosz Golaszewski <bgolaszewski-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>:
> Add DT bindings for the onboard SATA controller present on the DM816x
> SoCs.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
> ---
>  .../devicetree/bindings/ata/ahci-dm816.txt          | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/ata/ahci-dm816.txt
>
> diff --git a/Documentation/devicetree/bindings/ata/ahci-dm816.txt b/Documentation/devicetree/bindings/ata/ahci-dm816.txt
> new file mode 100644
> index 0000000..f8c535f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ata/ahci-dm816.txt
> @@ -0,0 +1,21 @@
> +Device tree binding for the TI DM816 AHCI SATA Controller
> +---------------------------------------------------------
> +
> +Required properties:
> +  - compatible: must be "ti,dm816-ahci"
> +  - reg: physical base address and size of the register region used by
> +         the controller (as defined by the AHCI 1.1 standard)
> +  - interrupts: interrupt specifier (refer to the interrupt binding)
> +  - clocks: list of phandle and clock specifier pairs (or only
> +            phandles for clock providers with '0' defined for
> +            #clock-cells); two clocks must be specified: the functional
> +            clock and an external reference clock
> +
> +Example:
> +
> +       sata: sata@4a140000 {
> +               compatible = "ti,dm816-ahci";
> +               reg = <0x4a140000 0x10000>;
> +               interrupts = <16>;
> +               clocks = <&sysclk5_ck>, <&sata_refclk>;
> +       };
> --
> 2.9.3
>

Hi Tejun,

can you pick this one up for your tree as well?

Thanks,
Bartosz
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Re: [PATCH v2 1/2] dt-bindings: ata: add DT bindings for ahci-dm816 SATA controller

[Bartosz Golaszewski]

2017-03-14 12:04 GMT+01:00 Bartosz Golaszewski <bgolaszewski@baylibre.com>:
> Add DT bindings for the onboard SATA controller present on the DM816x
> SoCs.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>  .../devicetree/bindings/ata/ahci-dm816.txt          | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/ata/ahci-dm816.txt
>
> diff --git a/Documentation/devicetree/bindings/ata/ahci-dm816.txt b/Documentation/devicetree/bindings/ata/ahci-dm816.txt
> new file mode 100644
> index 0000000..f8c535f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ata/ahci-dm816.txt
> @@ -0,0 +1,21 @@
> +Device tree binding for the TI DM816 AHCI SATA Controller
> +---------------------------------------------------------
> +
> +Required properties:
> +  - compatible: must be "ti,dm816-ahci"
> +  - reg: physical base address and size of the register region used by
> +         the controller (as defined by the AHCI 1.1 standard)
> +  - interrupts: interrupt specifier (refer to the interrupt binding)
> +  - clocks: list of phandle and clock specifier pairs (or only
> +            phandles for clock providers with '0' defined for
> +            #clock-cells); two clocks must be specified: the functional
> +            clock and an external reference clock
> +
> +Example:
> +
> +       sata: sata@4a140000 {
> +               compatible = "ti,dm816-ahci";
> +               reg = <0x4a140000 0x10000>;
> +               interrupts = <16>;
> +               clocks = <&sysclk5_ck>, <&sata_refclk>;
> +       };
> --
> 2.9.3
>

Hi Tejun,

can you pick this one up for your tree as well?

Thanks,
Bartosz

Re: [PATCH v2 1/2] dt-bindings: ata: add DT bindings for ahci-dm816 SATA controller

[Tejun Heo]

On Tue, Mar 14, 2017 at 12:04:50PM +0100, Bartosz Golaszewski wrote:
> Add DT bindings for the onboard SATA controller present on the DM816x
> SoCs.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Applied to libata/for-4.12.

Thanks.

-- 
tejun

[PATCH v2 2/2] ata: ahci: add support for DaVinci DM816 SATA controller

[Bartosz Golaszewski]

This SATA controller is quite similar to the one present on the DA850
SoC, but the PHY configuration is different and it supports two HBA
ports.

The IP suffers from the same PMP issue the DA850 does - if we enable
PMP but don't use it - softreset fails. Appropriate workaround was
implemented in this driver as well.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/ata/Kconfig      |   9 +++
 drivers/ata/Makefile     |   1 +
 drivers/ata/ahci_dm816.c | 200 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 210 insertions(+)
 create mode 100644 drivers/ata/ahci_dm816.c

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 70b57d2..7f59a7a 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -118,6 +118,15 @@ config AHCI_DA850
 
 	  If unsure, say N.
 
+config AHCI_DM816
+	tristate "DaVinci DM816 AHCI SATA support"
+	depends on ARCH_OMAP2PLUS
+	help
+	  This option enables support for the DaVinci DM816 SoC's
+	  onboard AHCI SATA controller.
+
+	  If unsure, say N.
+
 config AHCI_ST
 	tristate "ST AHCI SATA support"
 	depends on ARCH_STI
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 89a0a19..3052c0a 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_SATA_HIGHBANK)	+= sata_highbank.o libahci.o
 obj-$(CONFIG_AHCI_BRCM)		+= ahci_brcm.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_CEVA)		+= ahci_ceva.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_DA850)	+= ahci_da850.o libahci.o libahci_platform.o
+obj-$(CONFIG_AHCI_DM816)	+= ahci_dm816.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_IMX)		+= ahci_imx.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_MVEBU)	+= ahci_mvebu.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_OCTEON)	+= ahci_octeon.o
diff --git a/drivers/ata/ahci_dm816.c b/drivers/ata/ahci_dm816.c
new file mode 100644
index 0000000..fbd827c
--- /dev/null
+++ b/drivers/ata/ahci_dm816.c
@@ -0,0 +1,200 @@
+/*
+ * DaVinci DM816 AHCI SATA platform driver
+ *
+ * Copyright (C) 2017 BayLibre SAS
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/pm.h>
+#include <linux/platform_device.h>
+#include <linux/libata.h>
+#include <linux/ahci_platform.h>
+
+#include "ahci.h"
+
+#define AHCI_DM816_DRV_NAME		"ahci-dm816"
+
+#define AHCI_DM816_PHY_ENPLL(x)		((x) << 0)
+#define AHCI_DM816_PHY_MPY(x)		((x) << 1)
+#define AHCI_DM816_PHY_LOS(x)		((x) << 12)
+#define AHCI_DM816_PHY_RXCDR(x)		((x) << 13)
+#define AHCI_DM816_PHY_RXEQ(x)		((x) << 16)
+#define AHCI_DM816_PHY_TXSWING(x)	((x) << 23)
+
+#define AHCI_DM816_P0PHYCR_REG		0x178
+#define AHCI_DM816_P1PHYCR_REG		0x1f8
+
+#define AHCI_DM816_PLL_OUT		1500000000LU
+
+static const unsigned long pll_mpy_table[] = {
+	  400,  500,  600,  800,  825, 1000, 1200,
+	 1250, 1500, 1600, 1650, 2000, 2200, 2500
+};
+
+static int ahci_dm816_get_mpy_bits(unsigned long refclk_rate)
+{
+	unsigned long pll_multiplier;
+	int i;
+
+	/*
+	 * We need to determine the value of the multiplier (MPY) bits.
+	 * In order to include the 8.25 multiplier we need to first divide
+	 * the refclk rate by 100.
+	 */
+	pll_multiplier = AHCI_DM816_PLL_OUT / (refclk_rate / 100);
+
+	for (i = 0; i < ARRAY_SIZE(pll_mpy_table); i++) {
+		if (pll_mpy_table[i] == pll_multiplier)
+			return i;
+	}
+
+	/*
+	 * We should have divided evenly - if not, return an invalid
+	 * value.
+	 */
+	return -1;
+}
+
+static int ahci_dm816_phy_init(struct ahci_host_priv *hpriv, struct device *dev)
+{
+	unsigned long refclk_rate;
+	int mpy;
+	u32 val;
+
+	/*
+	 * We should have been supplied two clocks: the functional and
+	 * keep-alive clock and the external reference clock. We need the
+	 * rate of the latter to calculate the correct value of MPY bits.
+	 */
+	if (!hpriv->clks[1]) {
+		dev_err(dev, "reference clock not supplied\n");
+		return -EINVAL;
+	}
+
+	refclk_rate = clk_get_rate(hpriv->clks[1]);
+	if ((refclk_rate % 100) != 0) {
+		dev_err(dev, "reference clock rate must be divisible by 100\n");
+		return -EINVAL;
+	}
+
+	mpy = ahci_dm816_get_mpy_bits(refclk_rate);
+	if (mpy < 0) {
+		dev_err(dev, "can't calculate the MPY bits value\n");
+		return -EINVAL;
+	}
+
+	/* Enable the PHY and configure the first HBA port. */
+	val = AHCI_DM816_PHY_MPY(mpy) | AHCI_DM816_PHY_LOS(1) |
+	      AHCI_DM816_PHY_RXCDR(4) | AHCI_DM816_PHY_RXEQ(1) |
+	      AHCI_DM816_PHY_TXSWING(3) | AHCI_DM816_PHY_ENPLL(1);
+	writel(val, hpriv->mmio + AHCI_DM816_P0PHYCR_REG);
+
+	/* Configure the second HBA port. */
+	val = AHCI_DM816_PHY_LOS(1) | AHCI_DM816_PHY_RXCDR(4) |
+	      AHCI_DM816_PHY_RXEQ(1) | AHCI_DM816_PHY_TXSWING(3);
+	writel(val, hpriv->mmio + AHCI_DM816_P1PHYCR_REG);
+
+	return 0;
+}
+
+static int ahci_dm816_softreset(struct ata_link *link,
+				unsigned int *class, unsigned long deadline)
+{
+	int pmp, ret;
+
+	pmp = sata_srst_pmp(link);
+
+	/*
+	 * There's an issue with the SATA controller on DM816 SoC: if we
+	 * enable Port Multiplier support, but the drive is connected directly
+	 * to the board, it can't be detected. As a workaround: if PMP is
+	 * enabled, we first call ahci_do_softreset() and pass it the result of
+	 * sata_srst_pmp(). If this call fails, we retry with pmp = 0.
+	 */
+	ret = ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
+	if (pmp && ret == -EBUSY)
+		return ahci_do_softreset(link, class, 0,
+					 deadline, ahci_check_ready);
+
+	return ret;
+}
+
+static struct ata_port_operations ahci_dm816_port_ops = {
+	.inherits = &ahci_platform_ops,
+	.softreset = ahci_dm816_softreset,
+};
+
+static const struct ata_port_info ahci_dm816_port_info = {
+	.flags		= AHCI_FLAG_COMMON,
+	.pio_mask	= ATA_PIO4,
+	.udma_mask	= ATA_UDMA6,
+	.port_ops	= &ahci_dm816_port_ops,
+};
+
+static struct scsi_host_template ahci_dm816_platform_sht = {
+	AHCI_SHT(AHCI_DM816_DRV_NAME),
+};
+
+static int ahci_dm816_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ahci_host_priv *hpriv;
+	int rc;
+
+	hpriv = ahci_platform_get_resources(pdev);
+	if (IS_ERR(hpriv))
+		return PTR_ERR(hpriv);
+
+	rc = ahci_platform_enable_resources(hpriv);
+	if (rc)
+		return rc;
+
+	rc = ahci_dm816_phy_init(hpriv, dev);
+	if (rc)
+		goto disable_resources;
+
+	rc = ahci_platform_init_host(pdev, hpriv,
+				     &ahci_dm816_port_info,
+				     &ahci_dm816_platform_sht);
+	if (rc)
+		goto disable_resources;
+
+	return 0;
+
+disable_resources:
+	ahci_platform_disable_resources(hpriv);
+
+	return rc;
+}
+
+static SIMPLE_DEV_PM_OPS(ahci_dm816_pm_ops,
+			 ahci_platform_suspend,
+			 ahci_platform_resume);
+
+static const struct of_device_id ahci_dm816_of_match[] = {
+	{ .compatible = "ti,dm816-ahci", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ahci_dm816_of_match);
+
+static struct platform_driver ahci_dm816_driver = {
+	.probe = ahci_dm816_probe,
+	.remove = ata_platform_remove_one,
+	.driver = {
+		.name = AHCI_DM816_DRV_NAME,
+		.of_match_table = ahci_dm816_of_match,
+		.pm = &ahci_dm816_pm_ops,
+	},
+};
+module_platform_driver(ahci_dm816_driver);
+
+MODULE_DESCRIPTION("DaVinci DM816 AHCI SATA platform driver");
+MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
+MODULE_LICENSE("GPL");
-- 
2.9.3

Re: [PATCH v2 2/2] ata: ahci: add support for DaVinci DM816 SATA controller

[Bartosz Golaszewski]

2017-03-14 12:04 GMT+01:00 Bartosz Golaszewski <bgolaszewski@baylibre.com>:
> This SATA controller is quite similar to the one present on the DA850
> SoC, but the PHY configuration is different and it supports two HBA
> ports.
>
> The IP suffers from the same PMP issue the DA850 does - if we enable
> PMP but don't use it - softreset fails. Appropriate workaround was
> implemented in this driver as well.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>  drivers/ata/Kconfig      |   9 +++
>  drivers/ata/Makefile     |   1 +
>  drivers/ata/ahci_dm816.c | 200 +++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 210 insertions(+)
>  create mode 100644 drivers/ata/ahci_dm816.c
>

Hi Tejun,

the DT bindings have been acked by Rob Herring and Tony Lindgren has
picked up the arch/arm patches. If there are no objections, could you
merge this driver and DT bindings for 4.12?

Thanks,
Bartosz

Re: [PATCH v2 2/2] ata: ahci: add support for DaVinci DM816 SATA controller

[Tejun Heo]

On Tue, Mar 14, 2017 at 12:04:51PM +0100, Bartosz Golaszewski wrote:
> This SATA controller is quite similar to the one present on the DA850
> SoC, but the PHY configuration is different and it supports two HBA
> ports.
> 
> The IP suffers from the same PMP issue the DA850 does - if we enable
> PMP but don't use it - softreset fails. Appropriate workaround was
> implemented in this driver as well.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>

Applied to libata/for-4.12.

Thanks.

-- 
tejun
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Re: [PATCH v2 2/2] ata: ahci: add support for DaVinci DM816 SATA controller

[Tejun Heo]

On Tue, Mar 14, 2017 at 12:04:51PM +0100, Bartosz Golaszewski wrote:
> This SATA controller is quite similar to the one present on the DA850
> SoC, but the PHY configuration is different and it supports two HBA
> ports.
> 
> The IP suffers from the same PMP issue the DA850 does - if we enable
> PMP but don't use it - softreset fails. Appropriate workaround was
> implemented in this driver as well.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Applied to libata/for-4.12.

Thanks.

-- 
tejun