Re: [PATCH v2 2/2] drivers: ata: add support for Ceva sata host controller

[Michal Simek <monstr@monstr.eu>]

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On 06/05/2015 08:02 AM, Suneel Garapati wrote:
> Adds support for Ceva sata host controller on Xilinx
> Zynq UltraScale+ MPSoC.
> 
> Signed-off-by: Suneel Garapati <suneel.garapati@xilinx.com>
> ---
> Changes v2
>  - Change module license string to GPL v2
> ---
>  drivers/ata/Kconfig     |   9 ++
>  drivers/ata/Makefile    |   1 +
>  drivers/ata/ahci_ceva.c | 225 ++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 235 insertions(+)
>  create mode 100644 drivers/ata/ahci_ceva.c
> 
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index b4524f4..6d17a3b 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -133,6 +133,15 @@ config AHCI_IMX
> 
> 	  If unsure, say N.
> 
> +config AHCI_CEVA
> +	tristate "CEVA AHCI SATA support"
> +	depends on OF
> +	help
> +	  This option enables support for the CEVA AHCI SATA.
> +	  It can be found on the Xilinx Zynq UltraScale+ MPSoC.
> +
> +	  If unsure, say N.
> +
>  config AHCI_MVEBU
> 	tristate "Marvell EBU AHCI SATA support"
> 	depends on ARCH_MVEBU
> diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
> index 5154753..af70919 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_BRCMSTB)	+= ahci_brcmstb.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-$(CONFIG_AHCI_IMX)		+= ahci_imx.o libahci.o libahci_platform.o
>  obj-$(CONFIG_AHCI_MVEBU)	+= ahci_mvebu.o libahci.o libahci_platform.o
> diff --git a/drivers/ata/ahci_ceva.c b/drivers/ata/ahci_ceva.c
> new file mode 100644
> index 0000000..559d960
> --- /dev/null
> +++ b/drivers/ata/ahci_ceva.c
> @@ -0,0 +1,225 @@
> +/*
> + * Copyright (C) 2015 Xilinx, Inc.
> + * CEVA AHCI SATA platform driver
> + *
> + * 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/ahci_platform.h>
> +#include <linux/kernel.h>
> +#include <linux/libata.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include "ahci.h"
> +
> +/* Vendor Specific Register Offsets */
> +#define AHCI_VEND_PCFG  0xA4
> +#define AHCI_VEND_PPCFG 0xA8
> +#define AHCI_VEND_PP2C  0xAC
> +#define AHCI_VEND_PP3C  0xB0
> +#define AHCI_VEND_PP4C  0xB4
> +#define AHCI_VEND_PP5C  0xB8
> +#define AHCI_VEND_PAXIC 0xC0
> +#define AHCI_VEND_PTC   0xC8
> +
> +/* Vendor Specific Register bit definitions */
> +#define PAXIC_ADBW_BW64 0x1
> +#define PAXIC_MAWIDD	(1 << 8)
> +#define PAXIC_MARIDD	(1 << 16)
> +#define PAXIC_OTL	(0x4 << 20)
> +
> +#define PCFG_TPSS_VAL	(0x32 << 16)
> +#define PCFG_TPRS_VAL	(0x2 << 12)
> +#define PCFG_PAD_VAL	0x2
> +
> +#define PPCFG_TTA	0x1FFFE
> +#define PPCFG_PSSO_EN	(1 << 28)
> +#define PPCFG_PSS_EN	(1 << 29)
> +#define PPCFG_ESDF_EN	(1 << 31)
> +
> +#define PP2C_CIBGMN	0x0F
> +#define PP2C_CIBGMX	(0x25 << 8)
> +#define PP2C_CIBGN	(0x18 << 16)
> +#define PP2C_CINMP	(0x29 << 24)
> +
> +#define PP3C_CWBGMN	0x04
> +#define PP3C_CWBGMX	(0x0B << 8)
> +#define PP3C_CWBGN	(0x08 << 16)
> +#define PP3C_CWNMP	(0x0F << 24)
> +
> +#define PP4C_BMX	0x0a
> +#define PP4C_BNM	(0x08 << 8)
> +#define PP4C_SFD	(0x4a << 16)
> +#define PP4C_PTST	(0x06 << 24)
> +
> +#define PP5C_RIT	0x60216
> +#define PP5C_RCT	(0x7f0 << 20)
> +
> +#define PTC_RX_WM_VAL	0x40
> +#define PTC_RSVD	(1 << 27)
> +
> +#define PORT0_BASE	0x100
> +#define PORT1_BASE	0x180
> +
> +/* Port Control Register Bit Definitions */
> +#define PORT_SCTL_SPD_GEN2	(0x2 << 4)
> +#define PORT_SCTL_SPD_GEN1	(0x1 << 4)
> +#define PORT_SCTL_IPM		(0x3 << 8)
> +
> +#define PORT_BASE	0x100
> +#define PORT_OFFSET	0x80
> +#define NR_PORTS	2
> +#define DRV_NAME	"ahci-ceva"
> +#define CEVA_FLAG_BROKEN_GEN2	1
> +
> +struct ceva_ahci_priv {
> +	struct platform_device *ahci_pdev;
> +	int flags;
> +};
> +
> +static struct ata_port_operations ahci_ceva_ops = {
> +	.inherits = &ahci_platform_ops,
> +};
> +
> +static const struct ata_port_info ahci_ceva_port_info = {
> +	.flags          = AHCI_FLAG_COMMON,
> +	.pio_mask       = ATA_PIO4,
> +	.udma_mask      = ATA_UDMA6,
> +	.port_ops	= &ahci_ceva_ops,
> +};
> +
> +static void ahci_ceva_setup(struct ahci_host_priv *hpriv)
> +{
> +	void __iomem *mmio = hpriv->mmio;
> +	struct ceva_ahci_priv *cevapriv = hpriv->plat_data;
> +	u32 tmp;
> +	int i;
> +
> +	/*
> +	 * AXI Data bus width to 64
> +	 * Set Mem Addr Read, Write ID for data transfers
> +	 * Transfer limit to 72 DWord
> +	 */
> +	tmp = PAXIC_ADBW_BW64 | PAXIC_MAWIDD | PAXIC_MARIDD | PAXIC_OTL;
> +	writel(tmp, mmio + AHCI_VEND_PAXIC);
> +
> +	/* Set AHCI Enable */
> +	tmp = readl(mmio + HOST_CTL);
> +	tmp |= HOST_AHCI_EN;
> +	writel(tmp, mmio + HOST_CTL);
> +
> +	for (i = 0; i < NR_PORTS; i++) {
> +		/* TPSS TPRS scalars, CISE and Port Addr */
> +		tmp = PCFG_TPSS_VAL | PCFG_TPRS_VAL | (PCFG_PAD_VAL + i);
> +		writel(tmp, mmio + AHCI_VEND_PCFG);
> +
> +		/* Port Phy Cfg register enables */
> +		tmp = PPCFG_TTA | PPCFG_PSS_EN | PPCFG_ESDF_EN;
> +		writel(tmp, mmio + AHCI_VEND_PPCFG);
> +
> +		/* Phy Control OOB timing parameters COMINIT */
> +		tmp = PP2C_CIBGMN | PP2C_CIBGMX | PP2C_CIBGN | PP2C_CINMP;
> +		writel(tmp, mmio + AHCI_VEND_PP2C);
> +
> +		/* Phy Control OOB timing parameters COMWAKE */
> +		tmp = PP3C_CWBGMN | PP3C_CWBGMX | PP3C_CWBGN | PP3C_CWNMP;
> +		writel(tmp, mmio + AHCI_VEND_PP3C);
> +
> +		/* Phy Control Burst timing setting */
> +		tmp = PP4C_BMX | PP4C_BNM | PP4C_SFD | PP4C_PTST;
> +		writel(tmp, mmio + AHCI_VEND_PP4C);
> +
> +		/* Rate Change Timer and Retry Interval Timer setting */
> +		tmp = PP5C_RIT | PP5C_RCT;
> +		writel(tmp, mmio + AHCI_VEND_PP5C);
> +
> +		/* Rx Watermark setting  */
> +		tmp = PTC_RX_WM_VAL | PTC_RSVD;
> +		writel(tmp, mmio + AHCI_VEND_PTC);
> +
> +		/* Default to Gen 2 Speed and Gen 1 if Gen2 is broken */
> +		tmp = PORT_SCTL_SPD_GEN2 | PORT_SCTL_IPM;
> +		if (cevapriv->flags & CEVA_FLAG_BROKEN_GEN2)
> +			tmp = PORT_SCTL_SPD_GEN1 | PORT_SCTL_IPM;
> +		writel(tmp, mmio + PORT_SCR_CTL + PORT_BASE + PORT_OFFSET * i);
> +	}
> +}
> +
> +static struct scsi_host_template ahci_platform_sht = {
> +	AHCI_SHT(DRV_NAME),
> +};
> +
> +static int ceva_ahci_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct device *dev = &pdev->dev;
> +	struct ahci_host_priv *hpriv;
> +	struct ceva_ahci_priv *cevapriv;
> +
> +	cevapriv = devm_kzalloc(dev, sizeof(*cevapriv), GFP_KERNEL);
> +	if (!cevapriv)
> +		return -ENOMEM;
> +
> +	cevapriv->ahci_pdev = pdev;
> +
> +	hpriv = ahci_platform_get_resources(pdev);
> +	if (IS_ERR(hpriv))
> +		return PTR_ERR(hpriv);
> +
> +	if (of_property_read_bool(np, "ceva,broken-gen2"))
> +		cevapriv->flags = CEVA_FLAG_BROKEN_GEN2;
> +
> +	hpriv->plat_data = cevapriv;
> +
> +	/* CEVA specific initialization */
> +	ahci_ceva_setup(hpriv);
> +
> +	return ahci_platform_init_host(pdev, hpriv, &ahci_ceva_port_info,
> +					&ahci_platform_sht);
> +}
> +
> +static int __maybe_unused ceva_ahci_suspend(struct device *dev)
> +{
> +	return ahci_platform_suspend_host(dev);
> +}
> +
> +static int __maybe_unused ceva_ahci_resume(struct device *dev)
> +{
> +	return ahci_platform_resume_host(dev);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(ahci_ceva_pm_ops, ceva_ahci_suspend, ceva_ahci_resume);
> +
> +static const struct of_device_id ceva_ahci_of_match[] = {
> +	{ .compatible = "ceva,ahci-1v84" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, ceva_ahci_of_match);
> +
> +static struct platform_driver ceva_ahci_driver = {
> +	.probe = ceva_ahci_probe,
> +	.remove = ata_platform_remove_one,
> +	.driver = {
> +		.name = DRV_NAME,
> +		.of_match_table = ceva_ahci_of_match,
> +		.pm = &ahci_ceva_pm_ops,
> +	},
> +};
> +module_platform_driver(ceva_ahci_driver);
> +
> +MODULE_DESCRIPTION("CEVA AHCI SATA platform driver");
> +MODULE_AUTHOR("Xilinx Inc.");
> +MODULE_LICENSE("GPL v2");
> --
> 2.1.2

Tested-by: Michal Simek <michal.simek@xilinx.com>

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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