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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