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Message-ID: <20150521215744.GE4914@htj.duckdns.org>
Date: Thu, 21 May 2015 17:57:44 -0400
From: Tejun Heo <tj@...nel.org>
To: Suneel Garapati <suneel.garapati@...inx.com>
Cc: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
michals@...inx.com, sorenb@...inx.com, devicetree@...r.kernel.org,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH 2/2] drivers: ata: add support for Ceva sata host
controller
(cc'ing Hans and quoting whole body for him)
On Thu, May 21, 2015 at 09:27:05AM +0530, Suneel Garapati wrote:
> Adds support for Ceva sata host controller on Xilinx
> Zynq UltraScale+ MPSoC.
>
> Signed-off-by: Suneel Garapati <suneel.garapati@...inx.com>
> ---
> 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 9dca4b9..ef3cfde 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -124,6 +124,15 @@ 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 40f7865..dc3a320 100644
> --- a/drivers/ata/Makefile
> +++ b/drivers/ata/Makefile
> @@ -10,6 +10,7 @@ obj-$(CONFIG_SATA_INIC162X) += sata_inic162x.o
> obj-$(CONFIG_SATA_SIL24) += sata_sil24.o
> obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o
> obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o libahci.o
> +obj-$(CONFIG_AHCI_CEVA) += ahci_ceva.o libahci.o libahci_platform.o
> obj-$(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..dfcd2f4
> --- /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("GPLv2");
> --
> 2.1.2
> --
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tejun
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