Re: [PATCH 07/12] scsi: add 'am53c974' driver

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On 21/11/2014 13:41, Hannes Reinecke wrote:
> This patch adds a new implementation for the Tekram DC-390T /
> AMD AM53c974 SCSI controller, based on the generic
> esp_scsi infrastructure.
> 
> Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
> ---
>  drivers/scsi/Kconfig    |  18 ++
>  drivers/scsi/Makefile   |   1 +
>  drivers/scsi/am53c974.c | 531 ++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 550 insertions(+)
>  create mode 100644 drivers/scsi/am53c974.c
> 
> diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
> index 60c67e1..519c3ef 100644
> --- a/drivers/scsi/Kconfig
> +++ b/drivers/scsi/Kconfig
> @@ -1357,6 +1357,24 @@ config SCSI_DC390T
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called tmscsim.
>  
> +config SCSI_AM53C974
> +	tristate "Tekram DC390(T) and Am53/79C974 SCSI support (new driver)"
> +	depends on PCI && SCSI
> +	select SCSI_SPI_ATTRS
> +	---help---
> +	  This driver supports PCI SCSI host adapters based on the Am53C974A
> +	  chip, e.g. Tekram DC390(T), DawiControl 2974 and some onboard
> +	  PCscsi/PCnet (Am53/79C974) solutions.
> +	  This is a new implementation base on the generic esp_scsi driver.
> +
> +	  Documentation can be found in <file:Documentation/scsi/tmscsim.txt>.
> +
> +	  Note that this driver does NOT support Tekram DC390W/U/F, which are
> +	  based on NCR/Symbios chips. Use "NCR53C8XX SCSI support" for those.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called am53c974.
> +
>  config SCSI_T128
>  	tristate "Trantor T128/T128F/T228 SCSI support"
>  	depends on ISA && SCSI
> diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
> index 59f1ce6..79a6571 100644
> --- a/drivers/scsi/Makefile
> +++ b/drivers/scsi/Makefile
> @@ -101,6 +101,7 @@ obj-$(CONFIG_SCSI_7000FASST)	+= wd7000.o
>  obj-$(CONFIG_SCSI_EATA)		+= eata.o
>  obj-$(CONFIG_SCSI_DC395x)	+= dc395x.o
>  obj-$(CONFIG_SCSI_DC390T)	+= tmscsim.o
> +obj-$(CONFIG_SCSI_AM53C974)	+= esp_scsi.o	am53c974.o
>  obj-$(CONFIG_MEGARAID_LEGACY)	+= megaraid.o
>  obj-$(CONFIG_MEGARAID_NEWGEN)	+= megaraid/
>  obj-$(CONFIG_MEGARAID_SAS)	+= megaraid/
> diff --git a/drivers/scsi/am53c974.c b/drivers/scsi/am53c974.c
> new file mode 100644
> index 0000000..86c4c42
> --- /dev/null
> +++ b/drivers/scsi/am53c974.c
> @@ -0,0 +1,531 @@
> +/*
> + * AMD am53c974 driver.
> + * Copyright (c) 2014 Hannes Reinecke, SUSE Linux GmbH
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/delay.h>
> +#include <linux/pci.h>
> +#include <linux/interrupt.h>
> +
> +#include <scsi/scsi_host.h>
> +
> +#include "esp_scsi.h"
> +
> +#define DRV_MODULE_NAME "am53c974"
> +#define DRV_MODULE_VERSION "1.00"
> +
> +// #define ESP_DMA_DEBUG
> +
> +#define ESP_DMA_CMD 0x10
> +#define ESP_DMA_STC 0x11
> +#define ESP_DMA_SPA 0x12
> +#define ESP_DMA_WBC 0x13
> +#define ESP_DMA_WAC 0x14
> +#define ESP_DMA_STATUS 0x15
> +#define ESP_DMA_SMDLA 0x16
> +#define ESP_DMA_WMAC 0x17
> +
> +#define ESP_DMA_CMD_IDLE 0x00
> +#define ESP_DMA_CMD_BLAST 0x01
> +#define ESP_DMA_CMD_ABORT 0x02
> +#define ESP_DMA_CMD_START 0x03
> +#define ESP_DMA_CMD_MASK  0x03
> +#define ESP_DMA_CMD_DIAG 0x04
> +#define ESP_DMA_CMD_MDL 0x10
> +#define ESP_DMA_CMD_INTE_P 0x20
> +#define ESP_DMA_CMD_INTE_D 0x40
> +#define ESP_DMA_CMD_DIR 0x80
> +
> +#define ESP_DMA_STAT_PWDN 0x01
> +#define ESP_DMA_STAT_ERROR 0x02
> +#define ESP_DMA_STAT_ABORT 0x04
> +#define ESP_DMA_STAT_DONE 0x08
> +#define ESP_DMA_STAT_SCSIINT 0x10
> +#define ESP_DMA_STAT_BCMPLT 0x20
> +
> +/* EEPROM is accessed with 16-bit values */
> +#define DC390_EEPROM_READ 0x80
> +#define DC390_EEPROM_LEN 0x40
> +
> +/*
> + * DC390 EEPROM
> + *
> + * 8 * 4 bytes of per-device options
> + * followed by HBA specific options
> + */
> +
> +/* Per-device options */
> +#define DC390_EE_MODE1 0x00
> +#define DC390_EE_SPEED 0x01
> +
> +/* HBA-specific options */
> +#define DC390_EE_ADAPT_SCSI_ID 0x40
> +#define DC390_EE_MODE2 0x41
> +#define DC390_EE_DELAY 0x42
> +#define DC390_EE_TAG_CMD_NUM 0x43
> +
> +#define DC390_EE_MODE1_PARITY_CHK   0x01
> +#define DC390_EE_MODE1_SYNC_NEGO    0x02
> +#define DC390_EE_MODE1_EN_DISC      0x04
> +#define DC390_EE_MODE1_SEND_START   0x08
> +#define DC390_EE_MODE1_TCQ          0x10
> +
> +#define DC390_EE_MODE2_MORE_2DRV    0x01
> +#define DC390_EE_MODE2_GREATER_1G   0x02
> +#define DC390_EE_MODE2_RST_SCSI_BUS 0x04
> +#define DC390_EE_MODE2_ACTIVE_NEGATION 0x08
> +#define DC390_EE_MODE2_NO_SEEK      0x10
> +#define DC390_EE_MODE2_LUN_CHECK    0x20
> +
> +struct pci_esp_priv {
> +	struct esp *esp;
> +	u8 dma_status;
> +};
> +
> +#define PCI_ESP_GET_PRIV(esp) ((struct pci_esp_priv *) \
> +			       pci_get_drvdata((struct pci_dev *) \
> +					       (esp)->dev))
> +
> +static void pci_esp_dma_drain(struct esp *esp);
> +
> +static void pci_esp_write8(struct esp *esp, u8 val, unsigned long reg)
> +{
> +	iowrite8(val, esp->regs + (reg * 4UL));
> +}
> +
> +static u8 pci_esp_read8(struct esp *esp, unsigned long reg)
> +{
> +	return ioread8(esp->regs + (reg * 4UL));
> +}
> +
> +static void pci_esp_write32(struct esp *esp, u32 val, unsigned long reg)
> +{
> +	return iowrite32(val, esp->regs + (reg * 4UL));
> +}
> +
> +static dma_addr_t pci_esp_map_single(struct esp *esp, void *buf,
> +				     size_t sz, int dir)
> +{
> +	return pci_map_single(esp->dev, buf, sz, dir);
> +}
> +
> +static int pci_esp_map_sg(struct esp *esp, struct scatterlist *sg,
> +			  int num_sg, int dir)
> +{
> +	return pci_map_sg(esp->dev, sg, num_sg, dir);
> +}
> +
> +static void pci_esp_unmap_single(struct esp *esp, dma_addr_t addr,
> +				 size_t sz, int dir)
> +{
> +	pci_unmap_single(esp->dev, addr, sz, dir);
> +}
> +
> +static void pci_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
> +			     int num_sg, int dir)
> +{
> +	pci_unmap_sg(esp->dev, sg, num_sg, dir);
> +}
> +
> +static int pci_esp_irq_pending(struct esp *esp)
> +{
> +	struct pci_esp_priv *pep = PCI_ESP_GET_PRIV(esp);
> +
> +	pep->dma_status = pci_esp_read8(esp, ESP_DMA_STATUS);
> +#ifdef ESP_DMA_DEBUG
> +	if (pep->dma_status)
> +		shost_printk(KERN_INFO, esp->host, "dma intr dreg[%02x]\n",
> +			     pep->dma_status);
> +#endif
> +	if (pep->dma_status & (ESP_DMA_STAT_ERROR |
> +			       ESP_DMA_STAT_ABORT |
> +			       ESP_DMA_STAT_DONE |
> +			       ESP_DMA_STAT_SCSIINT))
> +		return 1;
> +
> +	return 0;
> +}
> +
> +static void pci_esp_reset_dma(struct esp *esp)
> +{
> +	/* Nothing to do ? */
> +}
> +
> +static void pci_esp_dma_drain(struct esp *esp)
> +{
> +	u8 resid;
> +	int lim = 1000;
> +
> +
> +	if ((esp->sreg & ESP_STAT_PMASK) == ESP_DOP ||
> +	    (esp->sreg & ESP_STAT_PMASK) == ESP_DIP)
> +		/* Data-In or Data-Out, nothing to be done */
> +		return;
> +
> +	while (--lim > 0) {
> +		resid = pci_esp_read8(esp, ESP_FFLAGS) & ESP_FF_FBYTES;
> +		if (resid <= 1)
> +			break;
> +		cpu_relax();
> +	}
> +	if (resid > 1) {
> +		/* FIFO not cleared */
> +		shost_printk(KERN_INFO, esp->host,
> +			     "FIFO not cleared, %d bytes left\n",
> +			     resid);
> +	}
> +
> +	/*
> +	 * When there is a residual BCMPLT will never be set
> +	 * (obviously). But we still have to issue the BLAST
> +	 * command, otherwise the data will not being transferred.
> +	 * But we'll never know when the BLAST operation is
> +	 * finished. So check for some time and give up eventually.
> +	 */
> +	lim = 1000;
> +	pci_esp_write8(esp, ESP_DMA_CMD_DIR | ESP_DMA_CMD_BLAST, ESP_DMA_CMD);
> +	while (pci_esp_read8(esp, ESP_DMA_STATUS) & ESP_DMA_STAT_BCMPLT) {
> +		if (--lim == 0)
> +			break;
> +		cpu_relax();
> +	}
> +	pci_esp_write8(esp, ESP_DMA_CMD_DIR | ESP_DMA_CMD_IDLE, ESP_DMA_CMD);
> +#ifdef ESP_DMA_DEBUG
> +	shost_printk(KERN_INFO, esp->host,
> +		     "DMA blast done (%d tries, %d bytes left)\n", lim, resid);
> +#endif
> +}
> +
> +static void pci_esp_dma_invalidate(struct esp *esp)
> +{
> +	struct pci_esp_priv *pep = PCI_ESP_GET_PRIV(esp);
> +
> +#ifdef ESP_DMA_DEBUG
> +	shost_printk(KERN_INFO, esp->host, "invalidate DMA\n");
> +#endif
> +	pci_esp_write8(esp, ESP_DMA_CMD_IDLE, ESP_DMA_CMD);
> +	pep->dma_status = 0;
> +}
> +
> +static int pci_esp_dma_error(struct esp *esp)
> +{
> +	struct pci_esp_priv *pep = PCI_ESP_GET_PRIV(esp);
> +
> +	if (pep->dma_status & ESP_DMA_STAT_ERROR) {
> +		u8 dma_cmd = pci_esp_read8(esp, ESP_DMA_CMD);
> +
> +		if ((dma_cmd & ESP_DMA_CMD_MASK) == ESP_DMA_CMD_START)
> +			pci_esp_write8(esp, ESP_DMA_CMD_ABORT, ESP_DMA_CMD);
> +
> +		return 1;
> +	}
> +	if (pep->dma_status & ESP_DMA_STAT_ABORT) {
> +		pci_esp_write8(esp, ESP_DMA_CMD_IDLE, ESP_DMA_CMD);
> +		pep->dma_status = pci_esp_read8(esp, ESP_DMA_CMD);
> +		return 1;
> +	}
> +	return 0;
> +}
> +
> +static void pci_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
> +				 u32 dma_count, int write, u8 cmd)
> +{
> +	struct pci_esp_priv *pep = PCI_ESP_GET_PRIV(esp);
> +	u32 val = 0;
> +
> +	BUG_ON(!(cmd & ESP_CMD_DMA));
> +
> +	pep->dma_status = 0;
> +
> +	/* Set DMA engine to IDLE */
> +	if (write)
> +		/* DMA write direction logic is inverted */
> +		val |= ESP_DMA_CMD_DIR;
> +	pci_esp_write8(esp, ESP_DMA_CMD_IDLE | val, ESP_DMA_CMD);
> +
> +	pci_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
> +	pci_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
> +
> +	pci_esp_write32(esp, esp_count, ESP_DMA_STC);
> +	pci_esp_write32(esp, addr, ESP_DMA_SPA);
> +
> +#ifdef ESP_DMA_DEBUG
> +	shost_printk(KERN_INFO, esp->host, "start dma addr[%x] count[%d:%d]\n",
> +		     addr, esp_count, dma_count);
> +#endif
> +	scsi_esp_cmd(esp, cmd);
> +	/* Send DMA Start command */
> +	pci_esp_write8(esp, ESP_DMA_CMD_START | val, ESP_DMA_CMD);
> +}
> +
> +static const struct esp_driver_ops pci_esp_ops = {
> +	.esp_write8	=	pci_esp_write8,
> +	.esp_read8	=	pci_esp_read8,
> +	.map_single	=	pci_esp_map_single,
> +	.map_sg		=	pci_esp_map_sg,
> +	.unmap_single	=	pci_esp_unmap_single,
> +	.unmap_sg	=	pci_esp_unmap_sg,
> +	.irq_pending	=	pci_esp_irq_pending,
> +	.reset_dma	=	pci_esp_reset_dma,
> +	.dma_drain	=	pci_esp_dma_drain,
> +	.dma_invalidate	=	pci_esp_dma_invalidate,
> +	.send_dma_cmd	=	pci_esp_send_dma_cmd,
> +	.dma_error	=	pci_esp_dma_error,
> +};
> +
> +/*
> + * Read DC-390 eeprom
> + */
> +static void dc390_eeprom_prepare_read(struct pci_dev *pdev, u8 cmd)
> +{
> +	u8 carryFlag = 1, j = 0x80, bval;
> +	int i;
> +
> +	for (i = 0; i < 9; i++) {
> +		if (carryFlag) {
> +			pci_write_config_byte(pdev, 0x80, 0x40);
> +			bval = 0xc0;
> +		} else
> +			bval = 0x80;
> +
> +		udelay(160);
> +		pci_write_config_byte(pdev, 0x80, bval);
> +		udelay(160);
> +		pci_write_config_byte(pdev, 0x80, 0);
> +		udelay(160);
> +
> +		carryFlag = (cmd & j) ? 1 : 0;
> +		j >>= 1;
> +	}
> +}
> +
> +static u16 dc390_eeprom_get_data(struct pci_dev *pdev)
> +{
> +	int i;
> +	u16 wval = 0;
> +	u8 bval;
> +
> +	for (i = 0; i < 16; i++) {
> +		wval <<= 1;
> +
> +		pci_write_config_byte(pdev, 0x80, 0x80);
> +		udelay(160);
> +		pci_write_config_byte(pdev, 0x80, 0x40);
> +		udelay(160);
> +		pci_read_config_byte(pdev, 0x00, &bval);
> +
> +		if (bval == 0x22)
> +			wval |= 1;
> +	}
> +
> +	return wval;
> +}
> +
> +static void dc390_read_eeprom(struct pci_dev *pdev, u16 *ptr)
> +{
> +	u8 cmd = DC390_EEPROM_READ, i;
> +
> +	for (i = 0; i < DC390_EEPROM_LEN; i++) {
> +		pci_write_config_byte(pdev, 0xc0, 0);
> +		udelay(160);
> +
> +		dc390_eeprom_prepare_read(pdev, cmd++);
> +		*ptr++ = dc390_eeprom_get_data(pdev);
> +
> +		pci_write_config_byte(pdev, 0x80, 0);
> +		pci_write_config_byte(pdev, 0x80, 0);
> +		udelay(160);
> +	}
> +}
> +
> +static void dc390_check_eeprom(struct esp *esp)
> +{
> +	u8 EEbuf[128];
> +	u16 *ptr = (u16 *)EEbuf, wval = 0;
> +	int i;
> +
> +	dc390_read_eeprom((struct pci_dev *)esp->dev, ptr);
> +
> +	for (i = 0; i < DC390_EEPROM_LEN; i++, ptr++)
> +		wval += *ptr;
> +
> +	/* no Tekram EEprom found */
> +	if (wval != 0x1234) {
> +		struct pci_dev *pdev = esp->dev;
> +		dev_printk(KERN_INFO, &pdev->dev,
> +			   "No valid Tekram EEprom found\n");
> +		return;
> +	}
> +	esp->scsi_id = EEbuf[DC390_EE_ADAPT_SCSI_ID];
> +	esp->num_tags = 2 << EEbuf[DC390_EE_TAG_CMD_NUM];
> +}
> +
> +static int pci_esp_probe_one(struct pci_dev *pdev,
> +			      const struct pci_device_id *id)
> +{
> +	struct scsi_host_template *hostt = &scsi_esp_template;
> +	int err = -ENODEV;
> +	struct Scsi_Host *shost;
> +	struct esp *esp;
> +	struct pci_esp_priv *pep;
> +
> +	if (pci_enable_device(pdev)) {
> +		dev_printk(KERN_INFO, &pdev->dev, "cannot enable device\n");
> +		return -ENODEV;
> +	}
> +
> +	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
> +		dev_printk(KERN_INFO, &pdev->dev,
> +			   "failed to set 32bit DMA mask\n");
> +		goto fail_disable_device;
> +	}
> +
> +	shost = scsi_host_alloc(hostt, sizeof(struct esp));
> +	if (!shost) {
> +		dev_printk(KERN_INFO, &pdev->dev,
> +			   "failed to allocate scsi host\n");
> +		err = -ENOMEM;
> +		goto fail_disable_device;
> +	}
> +
> +	pep = kzalloc(sizeof(struct pci_esp_priv), GFP_KERNEL);
> +	if (!pep) {
> +		dev_printk(KERN_INFO, &pdev->dev,
> +			   "failed to allocate esp_priv\n");
> +		err = -ENOMEM;
> +		goto fail_host_alloc;
> +	}
> +
> +	esp = shost_priv(shost);
> +	esp->host = shost;
> +	esp->dev = pdev;
> +	esp->ops = &pci_esp_ops;
> +	/*
> +	 * The am53c974 HBA has a design flaw of generating
> +	 * spurious DMA completion interrupts when using
> +	 * DMA for command submission.
> +	 */
> +	esp->flags |= ESP_FLAG_USE_FIFO;
> +	pep->esp = esp;
> +
> +	if (pci_request_regions(pdev, DRV_MODULE_NAME)) {
> +		dev_printk(KERN_ERR, &pdev->dev,
> +			   "pci memory selection failed\n");
> +		goto fail_priv_alloc;
> +	}
> +
> +	esp->regs = pci_iomap(pdev, 0, pci_resource_len(pdev, 0));
> +	if (!esp->regs) {
> +		dev_printk(KERN_ERR, &pdev->dev, "pci I/O map failed\n");
> +		goto fail_release_regions;
> +	}
> +	esp->dma_regs = esp->regs;
> +
> +	pci_set_master(pdev);
> +
> +	esp->command_block = pci_alloc_consistent(pdev, 16,
> +						  &esp->command_block_dma);
> +	if (!esp->command_block) {
> +		dev_printk(KERN_ERR, &pdev->dev,
> +			   "failed to allocate command block\n");
> +		err = -ENOMEM;
> +		goto fail_unmap_regs;
> +	}
> +
> +	if (request_irq(pdev->irq, scsi_esp_intr, IRQF_SHARED,
> +			DRV_MODULE_NAME, esp)) {
> +		dev_printk(KERN_ERR, &pdev->dev, "failed to register IRQ\n");
> +		goto fail_unmap_command_block;
> +	}
> +
> +	esp->scsi_id = 7;
> +	dc390_check_eeprom(esp);
> +
> +	shost->this_id = esp->scsi_id;
> +	shost->max_id = 8;
> +	shost->irq = pdev->irq;
> +	shost->io_port = pci_resource_start(pdev, 0);
> +	shost->n_io_port = pci_resource_len(pdev, 0);
> +	shost->unique_id = shost->io_port;
> +	esp->scsi_id_mask = (1 << esp->scsi_id);
> +	/* Assume 40MHz clock */
> +	esp->cfreq = 40000000;
> +
> +	pci_set_drvdata(pdev, pep);
> +
> +	err = scsi_esp_register(esp, &pdev->dev);
> +	if (err)
> +		goto fail_free_irq;
> +
> +	return 0;
> +
> +fail_free_irq:
> +	free_irq(pdev->irq, esp);
> +fail_unmap_command_block:
> +	pci_free_consistent(pdev, 16, esp->command_block,
> +			    esp->command_block_dma);
> +fail_unmap_regs:
> +	pci_iounmap(pdev, esp->regs);
> +fail_release_regions:
> +	pci_release_regions(pdev);
> +fail_priv_alloc:
> +	kfree(pep);
> +fail_host_alloc:
> +	scsi_host_put(shost);
> +fail_disable_device:
> +	pci_disable_device(pdev);
> +
> +	return err;
> +}
> +
> +static void pci_esp_remove_one(struct pci_dev *pdev)
> +{
> +	struct pci_esp_priv *pep = pci_get_drvdata(pdev);
> +	struct esp *esp = pep->esp;
> +
> +	scsi_esp_unregister(esp);
> +	free_irq(pdev->irq, esp);
> +	pci_free_consistent(pdev, 16, esp->command_block,
> +			    esp->command_block_dma);
> +	pci_iounmap(pdev, esp->regs);
> +	pci_release_regions(pdev);
> +	pci_disable_device(pdev);
> +	kfree(pep);
> +
> +	scsi_host_put(esp->host);
> +}
> +
> +static struct pci_device_id am53c974_pci_tbl[] = {
> +	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_SCSI,
> +		PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(pci, am53c974_pci_tbl);
> +
> +static struct pci_driver am53c974_driver = {
> +	.name           = DRV_MODULE_NAME,
> +	.id_table       = am53c974_pci_tbl,
> +	.probe          = pci_esp_probe_one,
> +	.remove         = pci_esp_remove_one,
> +};
> +
> +static int __init am53c974_module_init(void)
> +{
> +	return pci_register_driver(&am53c974_driver);
> +}
> +
> +static void __exit am53c974_module_exit(void)
> +{
> +	pci_unregister_driver(&am53c974_driver);
> +}
> +
> +MODULE_DESCRIPTION("AM53C974 SCSI driver");
> +MODULE_AUTHOR("Hannes Reinecke <hare@xxxxxxx>");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION(DRV_MODULE_VERSION);
> +
> +module_init(am53c974_module_init);
> +module_exit(am53c974_module_exit);
> 

Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
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