Re: [U-Boot] [RFC 1/3] scsi: ata: Add DM SCSI interface to support None AHCI sata driver

On 2019-09-25 3:54 a.m., Peng Ma wrote:

In driver/ata. If the sata driver support AHCI mode, there will provides a complete set of SCSI interface. If the sata is not support AHCI mode(NONE_AHCI) there will not provides the SCSI interface.

This patch is to support SCSI interface for None AHCI sata such as fsl_sata.c sil_sata.c etc.

The patch rationale seems strange - SATA controllers don't inherently provide a SCSI interface regardless of whether they are AHCI or not. In the Linux kernel, SATA devices are supported using the SCSI layer via SCSI to ATA translation, which is a standardized mapping, largely in order to reuse a bunch of code - and U-Boot could choose to do the same - but AHCI controllers are handled the same way as all other SATA controllers in that regard by Linux, so I'm not sure why that distinction is being made here.

Signed-off-by: Peng Ma peng.ma@nxp.com

drivers/ata/Kconfig | 17 +++- drivers/ata/Makefile | 2 + drivers/ata/ata-uclass.c | 16 ++++ drivers/ata/ata.c | 244 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/ata/sata.c | 2 +- drivers/ata/scsi_ata.h | 43 +++++++++ include/dm/uclass-id.h | 1 + 7 files changed, 323 insertions(+), 2 deletions(-) create mode 100644 drivers/ata/ata-uclass.c create mode 100644 drivers/ata/ata.c create mode 100644 drivers/ata/scsi_ata.h

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig index 87636ae..3d6db2e 100644 --- a/drivers/ata/Kconfig +++ b/drivers/ata/Kconfig @@ -7,6 +7,13 @@ config AHCI operations at present. The block device interface has not been converted to driver model.

+config NONE_AHCI

• bool "Support None AHCI SATA controllers with driver model"
• depends on DM
• help

•  This enables a uclass for disk controllers in U-Boot. such as AHCI. It
  

•  support None AHCI sata with DM mode
  

config SATA bool "Support SATA controllers" select HAVE_BLOCK_DEVICE @@ -32,6 +39,15 @@ config SCSI_AHCI help Enable this to allow interfacing SATA devices via the SCSI layer.

+config SCSI_NONE_AHCI

• bool "Enable SCSI interface to None AHCI SATA devices"
• select LIBATA
• select SCSI
• select DM_SCSI
• help

•  Enable this to allow interfacing None AHCI SATA devices via the DM
  

•  SCSI layer.
  

menu "SATA/SCSI device support"

config AHCI_PCI @@ -49,7 +65,6 @@ config SATA_CEVA ZynqMP. Support up to 2 external devices. Complient with SATA 3.1 and AHCI 1.3 specifications with hot-plug detect feature.

config DWC_AHCI bool "Enable Synopsys DWC AHCI driver support" select SCSI_AHCI diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile index 6e03384..cddbdc8 100644 --- a/drivers/ata/Makefile +++ b/drivers/ata/Makefile @@ -6,8 +6,10 @@ obj-$(CONFIG_DWC_AHCI) += dwc_ahci.o obj-$(CONFIG_FSL_AHCI) += fsl_ahci.o obj-$(CONFIG_AHCI) += ahci-uclass.o +obj-$(CONFIG_NONE_AHCI) += ata-uclass.o obj-$(CONFIG_AHCI_PCI) += ahci-pci.o obj-$(CONFIG_SCSI_AHCI) += ahci.o +obj-$(CONFIG_SCSI_NONE_AHCI) += ata.o obj-$(CONFIG_DWC_AHSATA) += dwc_ahsata.o obj-$(CONFIG_FSL_SATA) += fsl_sata.o obj-$(CONFIG_LIBATA) += libata.o diff --git a/drivers/ata/ata-uclass.c b/drivers/ata/ata-uclass.c new file mode 100644 index 0000000..e2cc499 --- /dev/null +++ b/drivers/ata/ata-uclass.c @@ -0,0 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*

• • Copyright (c) 2019 NXP, Inc
• • Written by Peng Mapeng.ma@nxp.com
• */

+#include <common.h> +#include <dm.h> +#include <scsi.h> +#include "scsi_ata.h"

+UCLASS_DRIVER(ata) = {

• .id = UCLASS_NONE_AHCI,
• .name = "ata",
• .per_device_auto_alloc_size = sizeof(struct ata_uc_priv),

+}; diff --git a/drivers/ata/ata.c b/drivers/ata/ata.c new file mode 100644 index 0000000..bdb7403 --- /dev/null +++ b/drivers/ata/ata.c @@ -0,0 +1,244 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*

• • Copyright (C) NXP, Inc. 2019.
• • Author: Peng Mapeng.ma@nxp.com
• • with the reference on libata and none ahci drvier in kernel
• • This driver provides a DM SCSI interface to None AHCI SATA.
• */

+#include <common.h> +#include <dm/lists.h> +#include <dm.h> +#include <scsi.h> +#include <libata.h> +#include <sata.h> +#include <malloc.h> +#include <memalign.h> +#include <fis.h>

+#include "scsi_ata.h"

+int ata_bind_scsi(struct udevice *ata_dev, struct udevice **devp) +{

• int ret;
• struct udevice *dev;
• ret = device_bind_driver(ata_dev, "ata_scsi", "ata_scsi", &dev);
• if (ret)

• return ret;
  

• *devp = dev;
• return 0;

+}

+static int scsi_exec_internal(struct udevice *dev, struct scsi_cmd *pccb,

• 	      bool is_write)
  

+{

• u32 temp;
• u16 blocks = 0;
• int ret = -ENODEV;
• lbaint_t start = 0;
• u8 port = pccb->target;
• u8 *buffer = pccb->pdata;
• struct ata_uc_priv *uc_priv = dev_get_uclass_priv(dev);
• /* Retrieve the base LBA number from the ccb structure. */
• if (pccb->cmd[0] == SCSI_READ16) {

• memcpy(&start, pccb->cmd + 2, 8);
  

• start = be64_to_cpu(start);
  

• } else {

• memcpy(&temp, pccb->cmd + 2, 4);
  

• start = be32_to_cpu(temp);
  

• }
• if (pccb->cmd[0] == SCSI_READ16)

• blocks = (((u16)pccb->cmd[13]) << 8) | ((u16)pccb->cmd[14]);
  

• else

• blocks = (((u16)pccb->cmd[7]) << 8) | ((u16)pccb->cmd[8]);
  

• debug("scsi_ata: %s %u blocks starting from lba 0x" LBAFU "\n",

•      is_write ?  "write" : "read", blocks, start);
  

• if (is_write)

• if (uc_priv->write)
  

• 	ret = uc_priv->write(dev, start, blocks, buffer, port);
  

• else
  

• 	pr_err("scsi_ata: write ptr is NULL\n");
  

• else

• if (uc_priv->read)
  

• 	ret = uc_priv->read(dev, start, blocks, buffer, port);
  

• else
  

• 	pr_err("scsi_ata: read ptr is NULL\n");
  

• return ret;

+}

+static char *fsl_ata_id_strcpy(u16 *target, u16 *src, int len) +{

• int i;
• for (i = 0; i < len / 2; i++)

• target[i] = src[i];
  

• return (char *)target;

+}

+static int ata_scsiop_inquiry(struct udevice *dev, struct scsi_cmd *pccb) +{

• u8 port;
• u16 *idbuf;
• struct ata_uc_priv *uc_priv = dev_get_uclass_priv(dev);
• ALLOC_CACHE_ALIGN_BUFFER(u16, tmpid, ATA_ID_WORDS);
• /* Clean ccb data buffer */
• memset(pccb->pdata, 0, pccb->datalen);
• if (pccb->datalen <= 35)

• return 0;
  

• /* Read id from sata */
• port = pccb->target;
• if (uc_priv->ata_inquiry) {

• uc_priv->ata_inquiry(dev, (u16 *)tmpid, port);
  

• } else {

• pr_err("scsi_ata: ata_inquiry ptr is NULL\n");
  

• return -ENODEV;
  

• }
• if (!uc_priv->ataid[port]) {

• uc_priv->ataid[port] = malloc(ATA_ID_WORDS * 2);
  

• if (!uc_priv->ataid[port]) {
  

• 	pr_err("%s: No memory for ataid[port]\n", __func__);
  

• 	return -ENOMEM;
  

• }
  

• }
• idbuf = uc_priv->ataid[port];
• memcpy(idbuf, tmpid, ATA_ID_WORDS * 2);
• memcpy(&pccb->pdata[8], "ATA ", 8);
• fsl_ata_id_strcpy((u16 *)&pccb->pdata[16], &idbuf[ATA_ID_PROD], 16);
• fsl_ata_id_strcpy((u16 *)&pccb->pdata[32], &idbuf[ATA_ID_FW_REV], 4);

+#ifdef DEBUG

• ata_dump_id(idbuf);

+#endif

• return 0;

+}

+/*

• • SCSI READ CAPACITY10 command operation.
• */

+static int ata_scsiop_read_capacity10(struct ata_uc_priv *uc_priv,

• 		      struct scsi_cmd *pccb)
  

+{

• u32 cap;
• u64 cap64;
• u32 block_size;
• if (!uc_priv->ataid[pccb->target]) {

• pr_err("scsi_ata: SCSI READ CAPACITY10 command failure.");
  

• pr_err("\tNo ATA info!\n");
  

• pr_err("\tPlease run SCSI command INQUIRY first!\n");
  

• return -EPERM;
  

• }
• cap64 = ata_id_n_sectors(uc_priv->ataid[pccb->target]);
• if (cap64 > 0x100000000ULL)

• cap64 = 0xffffffff;
  

• cap = cpu_to_be32(cap64);
• memcpy(pccb->pdata, &cap, sizeof(cap));
• block_size = cpu_to_be32((u32)512);
• memcpy(&pccb->pdata[4], &block_size, 4);
• return 0;

+}

+/*

• • SCSI READ CAPACITY16 command operation.
• */

+static int ata_scsiop_read_capacity16(struct ata_uc_priv *uc_priv,

• 		      struct scsi_cmd *pccb)
  

+{

• u64 cap;
• u64 block_size;
• if (!uc_priv->ataid[pccb->target]) {

• pr_err("scsi_ata: SCSI READ CAPACITY16 command failure.");
  

• pr_err("\tNo ATA info!\n");
  

• pr_err("\tPlease run SCSI command INQUIRY first!\n");
  

• return -EPERM;
  

• }
• cap = ata_id_n_sectors(uc_priv->ataid[pccb->target]);
• cap = cpu_to_be64(cap);
• memcpy(pccb->pdata, &cap, sizeof(cap));
• block_size = cpu_to_be64((u64)512);
• memcpy(&pccb->pdata[8], &block_size, 8);
• return 0;

+}

+/*

• • SCSI TEST UNIT READY command operation.
• */

+static int ata_scsiop_test_unit_ready(struct ata_uc_priv *uc_priv,

• 		      struct scsi_cmd *pccb)
  

+{

• return (uc_priv->ataid[pccb->target]) ? 0 : -EPERM;

+}

+static int ata_scsi_exec(struct udevice *dev, struct scsi_cmd *pccb) +{

• struct ata_uc_priv *uc_priv = dev_get_uclass_priv(dev->parent);
• int ret;
• switch (pccb->cmd[0]) {
• case SCSI_READ16:
• case SCSI_READ10:

• ret = scsi_exec_internal(dev->parent, pccb, 0);
  

• break;
  

• case SCSI_WRITE10:

• ret = scsi_exec_internal(dev->parent, pccb, 1);
  

• break;
  

• case SCSI_RD_CAPAC10:

• ret = ata_scsiop_read_capacity10(uc_priv, pccb);
  

• break;
  

• case SCSI_RD_CAPAC16:

• ret = ata_scsiop_read_capacity16(uc_priv, pccb);
  

• break;
  

• case SCSI_TST_U_RDY:

• ret = ata_scsiop_test_unit_ready(uc_priv, pccb);
  

• break;
  

• case SCSI_INQUIRY:

• ret = ata_scsiop_inquiry(dev->parent, pccb);
  

• break;
  

• default:

• pr_err("Unsupport SCSI command 0x%02x\n", pccb->cmd[0]);
  

• return -ENOTSUPP;
  

• }
• if (ret) {

• debug("SCSI command 0x%02x ret errno %d\n", pccb->cmd[0], ret);
  

• return ret;
  

• }
• return 0;

+}

+struct scsi_ops ata_scsi_ops = {

• .exec = ata_scsi_exec,

+};

+U_BOOT_DRIVER(ata_scsi) = {

• .name = "ata_scsi",
• .id = UCLASS_SCSI,
• .ops = &ata_scsi_ops,

+}; diff --git a/drivers/ata/sata.c b/drivers/ata/sata.c index e384b80..1fee375 100644 --- a/drivers/ata/sata.c +++ b/drivers/ata/sata.c @@ -83,7 +83,7 @@ static unsigned long sata_bwrite(struct blk_desc *block_dev, lbaint_t start, } #endif

-#ifndef CONFIG_AHCI +#ifndef CONFIG_SCSI int __sata_initialize(void) { int rc, ret = -1; diff --git a/drivers/ata/scsi_ata.h b/drivers/ata/scsi_ata.h new file mode 100644 index 0000000..472a562 --- /dev/null +++ b/drivers/ata/scsi_ata.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/*

• • Copyright (C) NXP Inc. 2019.
• • Author: Peng Mapeng.ma@nxp.com
• */

+#ifndef _AHCI_H_ +#define _AHCI_H_

+#include <pci.h>

+#define ATA_MAX_PORTS 32 +/**

• • struct ata_uc_priv - information about an ATA controller
• • When driver model is used, this is accessible using dev_get_uclass_priv(dev)
• • where dev is the controller (although at present it sometimes stands alone).
• */

+struct ata_uc_priv { +#if defined(CONFIG_DM_PCI) || defined(CONFIG_DM_SCSI)

• struct udevice *dev;

+#else

• pci_dev_t dev;

+#endif

• u16 *ataid[ATA_MAX_PORTS];
• ulong (*read)(struct udevice *dev, lbaint_t start, u16 blkcnt,

•       void *buffer, u8 port);
  

• ulong (*write)(struct udevice *dev, lbaint_t start, u16 blkcnt,

•        const void *buffer, u8 port);
  

• int (*ata_inquiry)(struct udevice *dev, u16 *buffer, u8 port);

+};

+/**

• • ata_bind_scsi() - bind a new SCSI bus as a child
• • Note that the SCSI bus device will itself bind block devices
• • @ahci_dev: AHCI parent device
• • @devp: Returns new SCSI bus device
• • @return 0 if OK, -ve on error
• */

+int ata_bind_scsi(struct udevice *ahci_dev, struct udevice **devp); +#endif diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index d4d9610..087cd2d 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -29,6 +29,7 @@ enum uclass_id { /* U-Boot uclasses start here - in alphabetical order */ UCLASS_ADC, /* Analog-to-digital converter */ UCLASS_AHCI, /* SATA disk controller */

• UCLASS_NONE_AHCI, /* SATA disk controller of None AHCI */ UCLASS_AUDIO_CODEC, /* Audio codec with control and data path */ UCLASS_AXI, /* AXI bus */ UCLASS_BLK, /* Block device */