From: Michael Schmitz <schm...@debian.org>

New combined SCSI driver for all ESP based Zorro SCSI boards for
m68k Amiga.

Code largely based on board specific parts of the old drivers (blz1230.c,
blz2060.c, cyberstorm.c, cyberstormII.c, fastlane.c which were removed
after the 2.6 kernel series for lack of maintenance) with contributions
by Tuomas Vainikka (TCQ bug tests and workaround) and Finn Thain (TCQ
bugfix by use of PIO in extended message in transfer).

New Kconfig option and Makefile entries for new Amiga Zorro ESP SCSI
driver included in this patch.

Use DMA transfers wherever possible, with board-specific DMA set-up
functions copied from the old driver code. Three byte reselection messages
do appear to cause DMA timeouts. So wire up a PIO transfer routine for
these instead. esp_reselect_with_tag explicitly sets esp->cmd_block_dma as
target address for the message bytes but PIO requires a virtual address.
Substiute kernel virtual address esp->cmd_block in PIO transfer call if
DMA address is esp->cmd_block_dma and phase is message in.

PIO code taken from mac_esp.c where the reselection timeout issue was
debugged and fixed first, with minor macro and function rename.

Signed-off-by: Michael Schmitz <schmitz...@gmail.com>
Reviewed-by: Finn Thain <fth...@telegraphics.com.au>
Reviewed-by: Christoph Hellwig <h...@lst.de>

---

Changes since v1:

Fixed issues raised by Finn Thain in initial code review:

- use KBUILD_MODNAME for driver name string.
- use pr_fmt() for pr_* format prefix.
- clean up DMA error reporting: clear error flag before each DMA
  operation, set error flag on PIO error. Don't test phase in dma_err hook.
- change confusing comment about semantics of read flag, add comments
  indicating DMA direction to DMA setup hooks.
- drop spurious braces around switch clauses.
- lift cfreq setting out of ID switch clauses.
- fix indentation.
- fix error codes on probe fail.
- drop check for board ID when unmapping DMA regs in error handling:
  the ioaddr > 0xffffff test already catches all cases where the DMA
  registers were ioremapped.
- dynamically alloc zorro_private_data.
- fix use of driver_data field (don't mix host and zorro_esp_priv
  pointers). Note: require esp pointer in zorro_esp_priv to find host
  pointer!
- back out phase bits changes to pio_cmd !write branch introduced
  to cope with ESP SELAS command. We don't use that code so keep
  it in sync with Finn's version.
- use esp_ops.dma_length_limit() to limit transfer size. After review
  of old driver code, use 0xffffff max transfer size throughout.

Fixed issues raised by Geert Uytterhoven:

- dynamically alloc zorro_private_data, store as device drvdata.
- store ctrl_data for CyberStormI in driver private data.
- use dma_sync_single_for_device() instead of cache_push/clear.
- handle case of duplicate board identity - check whether board is
  Zorro III or Zorro II (use ROM resource data for this). Also fix
  up DMA mask for Zorro II boards to 32 bits (these are really CPU
  expansion slot boards).
- remove zorro3 field from driver_data struct (now in private data).
- add braces around ambiguous if - else construct.
- use named structs instead of array for board config data.
- use scsi_option driver data flag for boards with optional ESP.

Other improvements and bugfixes

- fix Zorro device table error (duplicate ID used, also raised
  by Kars de Jong).
- error code fixup in error handling path.
- add separate DMA setup for Blizzard 1230 II board.
- add support for Cyberstorm II board.
- add register structs and DMA setup for Zorro III Fastlane board,
  following logic from old fastlane.c driver. Wire up Fastlane DMA
  and interrupt status routines, map the necessary low 24 bit board
  address space used for DMA target address setting. Clean up DMA
  register space ioremap() branch for Zorro III boards (currently
  Fastlane only) to end confusion about what to do in error recovery.
- use esp_ops.fastlane_esp_dma_invalidate() on Fastlane (and skip
  fastlane_esp_reset_dma() in DMA setup).
- credit Tuomas Vainikka for contributing Blizzard 1230 code (and
  testing).
- clarify comment about unsupported Oktagon SCSI board.
- remove unused const definitions carried over from old driver.

Changes since v2:

- add SPDX-License-Identifier.
- remove unused ratelimit.h.
- drop phys_to_virt() in PIO transfer routine, after ensuring PIO is only
  used for message in transfers to esp->command_block. This obviates any
  need for finding the virtual address corresponding to a DMA handle.
- drop BUG_ON(!(cmd & ESP_CMD_DMA)) assertion in DMA setup. Short of changes
  to the core ESP driver, this can never trigger.
- make ioremap() of DMA address range conditional on zep->zorro3 and use
  that same condition to unmap in error handling and driver exit.
  Omit board ID test as we only support a single Zorro III board, and add
  comment on what to do when adding support for more boards.
- free driver private data in driver exit.
- various whitespace related cleanup.

Changes since v3:

Finn  Thain:
- substitute esp->command_block for transfer address in each board DMA
  set-up, instead of in PIO transfer function.
- use kzalloc for struct zorro_esp_priv.
- clarify comment regarding selecting between Blizzard 1230 II or
  board (both share the ID with the Fastlane board).
- use dev_get|set_drvdata instead of zorro_get|set_drvdata wrapper.
- remove redundant comments.

Geert Uytterhoeven:
- use readb()/writeb() to access DMA registers, obviating the need for
  declaring register structs volatile.
- use const for board config and driver data table.
- drop ZORRO_ESP_GET_PRIV macro.
- add comments to clarify use of addr and fifo variables in PIO macros.
- add braces to Zorro II branch (DMA mask fixup).
- define board ops irq_pending, dma_invalidate and send_dma_cmd via
  function pointers in driver data.

Tuomas Vainikka:
- fix wrong config description in Kconfig (from NCR7xx driver).

Changes since v4:

- change tag line

Kars de Jong:
- fix misspelling of Blizzard 1230 as 1320 in config description

Changes since v5:

Christoph Hellwig:
- fix comment style
- drop initialization to zero in driver data init
- fix alignment in struct declarations
- drop braces around asm macros
- change board_base type to void __iomem *
- drop unneeded void __iomem * cast from ZTWO_VADDR() use
- add comment to explain why ZTWO_VADDR() use is safe
- move board specific functions to per-board esp_ops

Changes since v6:

Finn Thain:
- use z_writel to avoid sparse warnings in Fastlane DMA functions

Changes since v7:

Christoph Hellwig:
- use board type enum to index into board config data array, and
  select Fastlane vs. Blizzard 1230 board setup
- use ZORRO_ID(PHASE5, <board>, 0) version of board ID
- drop file name in header comments

---
 drivers/scsi/Kconfig     |   14 +
 drivers/scsi/Makefile    |    1 +
 drivers/scsi/zorro_esp.c | 1172 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1187 insertions(+), 0 deletions(-)
 create mode 100644 drivers/scsi/zorro_esp.c

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 8a739b7..94eb3f3 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1462,6 +1462,20 @@ config SCSI_ZORRO7XX
              accelerator card for the Amiga 1200,
            - the SCSI controller on the GVP Turbo 040/060 accelerator.
 
+config SCSI_ZORRO_ESP
+       tristate "Zorro ESP SCSI support"
+       depends on ZORRO && SCSI
+       select SCSI_SPI_ATTRS
+       help
+         Support for various NCR53C9x (ESP) based SCSI controllers on Zorro
+         expansion boards for the Amiga.
+         This includes:
+           - the Phase5 Blizzard 1230 II and IV SCSI controllers,
+           - the Phase5 Blizzard 2060 SCSI controller,
+           - the Phase5 Blizzard Cyberstorm and Cyberstorm II SCSI
+             controllers,
+           - the Fastlane Zorro III SCSI controller.
+
 config ATARI_SCSI
        tristate "Atari native SCSI support"
        depends on ATARI && SCSI
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index de1b3fc..20992d7 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_INFINIBAND_ISER)         += libiscsi.o
 obj-$(CONFIG_ISCSI_BOOT_SYSFS) += iscsi_boot_sysfs.o
 obj-$(CONFIG_SCSI_A4000T)      += 53c700.o     a4000t.o
 obj-$(CONFIG_SCSI_ZORRO7XX)    += 53c700.o     zorro7xx.o
+obj-$(CONFIG_SCSI_ZORRO_ESP)   += esp_scsi.o   zorro_esp.o
 obj-$(CONFIG_A3000_SCSI)       += a3000.o      wd33c93.o
 obj-$(CONFIG_A2091_SCSI)       += a2091.o      wd33c93.o
 obj-$(CONFIG_GVP11_SCSI)       += gvp11.o      wd33c93.o
diff --git a/drivers/scsi/zorro_esp.c b/drivers/scsi/zorro_esp.c
new file mode 100644
index 0000000..654163d
--- /dev/null
+++ b/drivers/scsi/zorro_esp.c
@@ -0,0 +1,1172 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ESP front-end for Amiga ZORRO SCSI systems.
+ *
+ * Copyright (C) 1996 Jesper Skov (js...@cygnus.co.uk)
+ *
+ * Copyright (C) 2011,2018 Michael Schmitz (schm...@debian.org) for
+ *               migration to ESP SCSI core
+ *
+ * Copyright (C) 2013 Tuomas Vainikka (tuomas.vaini...@aalto.fi) for
+ *               Blizzard 1230 DMA and probe function fixes
+ *
+ * Copyright (C) 2017 Finn Thain for PIO code from Mac ESP driver adapted here
+ */
+/*
+ * ZORRO bus code from:
+ */
+/*
+ * Detection routine for the NCR53c710 based Amiga SCSI Controllers for Linux.
+ *             Amiga MacroSystemUS WarpEngine SCSI controller.
+ *             Amiga Technologies/DKB A4091 SCSI controller.
+ *
+ * Written 1997 by Alan Hourihane <al...@fairlite.demon.co.uk>
+ * plus modifications of the 53c7xx.c driver to support the Amiga.
+ *
+ * Rewritten to use 53c700.c by Kars de Jong <jo...@linux-m68k.org>
+ */
+
+#define pr_fmt(fmt)        KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+#include <linux/delay.h>
+#include <linux/zorro.h>
+#include <linux/slab.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/cacheflush.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport_spi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+
+#include "esp_scsi.h"
+
+MODULE_AUTHOR("Michael Schmitz <schm...@debian.org>");
+MODULE_DESCRIPTION("Amiga Zorro NCR5C9x (ESP) driver");
+MODULE_LICENSE("GPL");
+
+/* per-board register layout definitions */
+
+/* Blizzard 1230 DMA interface */
+
+struct blz1230_dma_registers {
+       unsigned char dma_addr;         /* DMA address      [0x0000] */
+       unsigned char dmapad2[0x7fff];
+       unsigned char dma_latch;        /* DMA latch        [0x8000] */
+};
+
+/* Blizzard 1230II DMA interface */
+
+struct blz1230II_dma_registers {
+       unsigned char dma_addr;         /* DMA address      [0x0000] */
+       unsigned char dmapad2[0xf];
+       unsigned char dma_latch;        /* DMA latch        [0x0010] */
+};
+
+/* Blizzard 2060 DMA interface */
+
+struct blz2060_dma_registers {
+       unsigned char dma_led_ctrl;     /* DMA led control   [0x000] */
+       unsigned char dmapad1[0x0f];
+       unsigned char dma_addr0;        /* DMA address (MSB) [0x010] */
+       unsigned char dmapad2[0x03];
+       unsigned char dma_addr1;        /* DMA address       [0x014] */
+       unsigned char dmapad3[0x03];
+       unsigned char dma_addr2;        /* DMA address       [0x018] */
+       unsigned char dmapad4[0x03];
+       unsigned char dma_addr3;        /* DMA address (LSB) [0x01c] */
+};
+
+/* DMA control bits */
+#define DMA_WRITE 0x80000000
+
+/* Cyberstorm DMA interface */
+
+struct cyber_dma_registers {
+       unsigned char dma_addr0;        /* DMA address (MSB) [0x000] */
+       unsigned char dmapad1[1];
+       unsigned char dma_addr1;        /* DMA address       [0x002] */
+       unsigned char dmapad2[1];
+       unsigned char dma_addr2;        /* DMA address       [0x004] */
+       unsigned char dmapad3[1];
+       unsigned char dma_addr3;        /* DMA address (LSB) [0x006] */
+       unsigned char dmapad4[0x3fb];
+       unsigned char cond_reg;         /* DMA cond    (ro)  [0x402] */
+#define ctrl_reg  cond_reg             /* DMA control (wo)  [0x402] */
+};
+
+/* DMA control bits */
+#define CYBER_DMA_WRITE  0x40  /* DMA direction. 1 = write */
+#define CYBER_DMA_Z3     0x20  /* 16 (Z2) or 32 (CHIP/Z3) bit DMA transfer */
+
+/* DMA status bits */
+#define CYBER_DMA_HNDL_INTR 0x80       /* DMA IRQ pending? */
+
+/* The CyberStorm II DMA interface */
+struct cyberII_dma_registers {
+       unsigned char cond_reg;         /* DMA cond    (ro)  [0x000] */
+#define ctrl_reg  cond_reg             /* DMA control (wo)  [0x000] */
+       unsigned char dmapad4[0x3f];
+       unsigned char dma_addr0;        /* DMA address (MSB) [0x040] */
+       unsigned char dmapad1[3];
+       unsigned char dma_addr1;        /* DMA address       [0x044] */
+       unsigned char dmapad2[3];
+       unsigned char dma_addr2;        /* DMA address       [0x048] */
+       unsigned char dmapad3[3];
+       unsigned char dma_addr3;        /* DMA address (LSB) [0x04c] */
+};
+
+/* Fastlane DMA interface */
+
+struct fastlane_dma_registers {
+       unsigned char cond_reg;         /* DMA status  (ro) [0x0000] */
+#define ctrl_reg  cond_reg             /* DMA control (wo) [0x0000] */
+       char dmapad1[0x3f];
+       unsigned char clear_strobe;     /* DMA clear   (wo) [0x0040] */
+};
+
+/*
+ * The controller registers can be found in the Z2 config area at these
+ * offsets:
+ */
+#define FASTLANE_ESP_ADDR      0x1000001
+
+/* DMA status bits */
+#define FASTLANE_DMA_MINT      0x80
+#define FASTLANE_DMA_IACT      0x40
+#define FASTLANE_DMA_CREQ      0x20
+
+/* DMA control bits */
+#define FASTLANE_DMA_FCODE     0xa0
+#define FASTLANE_DMA_MASK      0xf3
+#define FASTLANE_DMA_WRITE     0x08    /* 1 = write */
+#define FASTLANE_DMA_ENABLE    0x04    /* Enable DMA */
+#define FASTLANE_DMA_EDI       0x02    /* Enable DMA IRQ ? */
+#define FASTLANE_DMA_ESI       0x01    /* Enable SCSI IRQ */
+
+/*
+ * private data used for driver
+ */
+struct zorro_esp_priv {
+       struct esp *esp;                /* our ESP instance - for Scsi_host* */
+       void __iomem *board_base;       /* virtual address (Zorro III board) */
+       int error;                      /* PIO error flag */
+       int zorro3;                     /* board is Zorro III */
+       unsigned char ctrl_data;        /* shadow copy of ctrl_reg */
+};
+
+/*
+ * On all implementations except for the Oktagon, padding between ESP
+ * registers is three bytes.
+ * On Oktagon, it is one byte - use a different accessor there.
+ *
+ * Oktagon needs PDMA - currently unsupported!
+ */
+
+static void zorro_esp_write8(struct esp *esp, u8 val, unsigned long reg)
+{
+       writeb(val, esp->regs + (reg * 4UL));
+}
+
+static u8 zorro_esp_read8(struct esp *esp, unsigned long reg)
+{
+       return readb(esp->regs + (reg * 4UL));
+}
+
+static dma_addr_t zorro_esp_map_single(struct esp *esp, void *buf,
+                                     size_t sz, int dir)
+{
+       return dma_map_single(esp->dev, buf, sz, dir);
+}
+
+static int zorro_esp_map_sg(struct esp *esp, struct scatterlist *sg,
+                                 int num_sg, int dir)
+{
+       return dma_map_sg(esp->dev, sg, num_sg, dir);
+}
+
+static void zorro_esp_unmap_single(struct esp *esp, dma_addr_t addr,
+                                 size_t sz, int dir)
+{
+       dma_unmap_single(esp->dev, addr, sz, dir);
+}
+
+static void zorro_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
+                             int num_sg, int dir)
+{
+       dma_unmap_sg(esp->dev, sg, num_sg, dir);
+}
+
+static int zorro_esp_irq_pending(struct esp *esp)
+{
+       /* check ESP status register; DMA has no status reg. */
+       if (zorro_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
+               return 1;
+
+       return 0;
+}
+
+static int cyber_esp_irq_pending(struct esp *esp)
+{
+       struct cyber_dma_registers __iomem *dregs = esp->dma_regs;
+       unsigned char dma_status = readb(&dregs->cond_reg);
+
+       /* It's important to check the DMA IRQ bit in the correct way! */
+       return ((zorro_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR) &&
+               (dma_status & CYBER_DMA_HNDL_INTR));
+}
+
+static int fastlane_esp_irq_pending(struct esp *esp)
+{
+       struct fastlane_dma_registers __iomem *dregs = esp->dma_regs;
+       unsigned char dma_status;
+
+       dma_status = readb(&dregs->cond_reg);
+
+       if (dma_status & FASTLANE_DMA_IACT)
+               return 0;       /* not our IRQ */
+
+       /* Return non-zero if ESP requested IRQ */
+       return (
+          (dma_status & FASTLANE_DMA_CREQ) &&
+          (!(dma_status & FASTLANE_DMA_MINT)) &&
+          (zorro_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR));
+}
+
+static u32 zorro_esp_dma_length_limit(struct esp *esp, u32 dma_addr,
+                                       u32 dma_len)
+{
+       return dma_len > 0xFFFFFF ? 0xFFFFFF : dma_len;
+}
+
+static void zorro_esp_reset_dma(struct esp *esp)
+{
+       /* nothing to do here */
+}
+
+static void zorro_esp_dma_drain(struct esp *esp)
+{
+       /* nothing to do here */
+}
+
+static void zorro_esp_dma_invalidate(struct esp *esp)
+{
+       /* nothing to do here */
+}
+
+static void fastlane_esp_dma_invalidate(struct esp *esp)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+       struct fastlane_dma_registers __iomem *dregs = esp->dma_regs;
+       unsigned char *ctrl_data = &zep->ctrl_data;
+
+       *ctrl_data = (*ctrl_data & FASTLANE_DMA_MASK);
+       writeb(0, &dregs->clear_strobe);
+       z_writel(0, zep->board_base);
+}
+
+/*
+ * Programmed IO routines follow.
+ */
+
+static inline unsigned int zorro_esp_wait_for_fifo(struct esp *esp)
+{
+       int i = 500000;
+
+       do {
+               unsigned int fbytes = zorro_esp_read8(esp, ESP_FFLAGS)
+                                                       & ESP_FF_FBYTES;
+
+               if (fbytes)
+                       return fbytes;
+
+               udelay(2);
+       } while (--i);
+
+       pr_err("FIFO is empty (sreg %02x)\n",
+              zorro_esp_read8(esp, ESP_STATUS));
+       return 0;
+}
+
+static inline int zorro_esp_wait_for_intr(struct esp *esp)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+       int i = 500000;
+
+       do {
+               esp->sreg = zorro_esp_read8(esp, ESP_STATUS);
+               if (esp->sreg & ESP_STAT_INTR)
+                       return 0;
+
+               udelay(2);
+       } while (--i);
+
+       pr_err("IRQ timeout (sreg %02x)\n", esp->sreg);
+       zep->error = 1;
+       return 1;
+}
+
+/*
+ * PIO macros as used in mac_esp.c.
+ * Note that addr and fifo arguments are local-scope variables declared
+ * in zorro_esp_send_pio_cmd(), the macros are only used in that function,
+ * and addr and fifo are referenced in each use of the macros so there
+ * is no need to pass them as macro parameters.
+ */
+#define ZORRO_ESP_PIO_LOOP(operands, reg1) \
+       asm volatile ( \
+            "1:     moveb " operands "\n" \
+            "       subqw #1,%1       \n" \
+            "       jbne 1b           \n" \
+            : "+a" (addr), "+r" (reg1) \
+            : "a" (fifo));
+
+#define ZORRO_ESP_PIO_FILL(operands, reg1) \
+       asm volatile ( \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       moveb " operands "\n" \
+            "       subqw #8,%1       \n" \
+            "       subqw #8,%1       \n" \
+            : "+a" (addr), "+r" (reg1) \
+            : "a" (fifo));
+
+#define ZORRO_ESP_FIFO_SIZE 16
+
+static void zorro_esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count,
+                                u32 dma_count, int write, u8 cmd)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+       u8 __iomem *fifo = esp->regs + ESP_FDATA * 16;
+       u8 phase = esp->sreg & ESP_STAT_PMASK;
+
+       cmd &= ~ESP_CMD_DMA;
+
+       if (write) {
+               u8 *dst = (u8 *)addr;
+               u8 mask = ~(phase == ESP_MIP ? ESP_INTR_FDONE : ESP_INTR_BSERV);
+
+               scsi_esp_cmd(esp, cmd);
+
+               while (1) {
+                       if (!zorro_esp_wait_for_fifo(esp))
+                               break;
+
+                       *dst++ = zorro_esp_read8(esp, ESP_FDATA);
+                       --esp_count;
+
+                       if (!esp_count)
+                               break;
+
+                       if (zorro_esp_wait_for_intr(esp))
+                               break;
+
+                       if ((esp->sreg & ESP_STAT_PMASK) != phase)
+                               break;
+
+                       esp->ireg = zorro_esp_read8(esp, ESP_INTRPT);
+                       if (esp->ireg & mask) {
+                               zep->error = 1;
+                               break;
+                       }
+
+                       if (phase == ESP_MIP)
+                               scsi_esp_cmd(esp, ESP_CMD_MOK);
+
+                       scsi_esp_cmd(esp, ESP_CMD_TI);
+               }
+       } else {        /* unused, as long as we only handle MIP here */
+               scsi_esp_cmd(esp, ESP_CMD_FLUSH);
+
+               if (esp_count >= ZORRO_ESP_FIFO_SIZE)
+                       ZORRO_ESP_PIO_FILL("%0@+,%2@", esp_count)
+               else
+                       ZORRO_ESP_PIO_LOOP("%0@+,%2@", esp_count)
+
+               scsi_esp_cmd(esp, cmd);
+
+               while (esp_count) {
+                       unsigned int n;
+
+                       if (zorro_esp_wait_for_intr(esp))
+                               break;
+
+                       if ((esp->sreg & ESP_STAT_PMASK) != phase)
+                               break;
+
+                       esp->ireg = zorro_esp_read8(esp, ESP_INTRPT);
+                       if (esp->ireg & ~ESP_INTR_BSERV) {
+                               zep->error = 1;
+                               break;
+                       }
+
+                       n = ZORRO_ESP_FIFO_SIZE -
+                           (zorro_esp_read8(esp, ESP_FFLAGS) & ESP_FF_FBYTES);
+                       if (n > esp_count)
+                               n = esp_count;
+
+                       if (n == ZORRO_ESP_FIFO_SIZE)
+                               ZORRO_ESP_PIO_FILL("%0@+,%2@", esp_count)
+                       else {
+                               esp_count -= n;
+                               ZORRO_ESP_PIO_LOOP("%0@+,%2@", n)
+                       }
+
+                       scsi_esp_cmd(esp, ESP_CMD_TI);
+               }
+       }
+}
+
+/* Blizzard 1230/60 SCSI-IV DMA */
+
+static void zorro_esp_send_blz1230_dma_cmd(struct esp *esp, u32 addr,
+                       u32 esp_count, u32 dma_count, int write, u8 cmd)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+       struct blz1230_dma_registers __iomem *dregs = esp->dma_regs;
+       u8 phase = esp->sreg & ESP_STAT_PMASK;
+
+       zep->error = 0;
+       /*
+        * Use PIO if transferring message bytes to esp->command_block_dma.
+        * PIO requires a virtual address, so substitute esp->command_block
+        * for addr.
+        */
+       if (phase == ESP_MIP && addr == esp->command_block_dma) {
+               zorro_esp_send_pio_cmd(esp, (u32) esp->command_block,
+                                       esp_count, dma_count, write, cmd);
+               return;
+       }
+
+       if (write)
+               /* DMA receive */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_FROM_DEVICE);
+       else
+               /* DMA send */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_TO_DEVICE);
+
+       addr >>= 1;
+       if (write)
+               addr &= ~(DMA_WRITE);
+       else
+               addr |= DMA_WRITE;
+
+       writeb((addr >> 24) & 0xff, &dregs->dma_latch);
+       writeb((addr >> 24) & 0xff, &dregs->dma_addr);
+       writeb((addr >> 16) & 0xff, &dregs->dma_addr);
+       writeb((addr >>  8) & 0xff, &dregs->dma_addr);
+       writeb(addr & 0xff, &dregs->dma_addr);
+
+       scsi_esp_cmd(esp, ESP_CMD_DMA);
+       zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
+       zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
+       zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
+
+       scsi_esp_cmd(esp, cmd);
+}
+
+/* Blizzard 1230-II DMA */
+
+static void zorro_esp_send_blz1230II_dma_cmd(struct esp *esp, u32 addr,
+                       u32 esp_count, u32 dma_count, int write, u8 cmd)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+       struct blz1230II_dma_registers __iomem *dregs = esp->dma_regs;
+       u8 phase = esp->sreg & ESP_STAT_PMASK;
+
+       zep->error = 0;
+       /* Use PIO if transferring message bytes to esp->command_block_dma */
+       if (phase == ESP_MIP && addr == esp->command_block_dma) {
+               zorro_esp_send_pio_cmd(esp, (u32) esp->command_block,
+                                       esp_count, dma_count, write, cmd);
+               return;
+       }
+
+       if (write)
+               /* DMA receive */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_FROM_DEVICE);
+       else
+               /* DMA send */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_TO_DEVICE);
+
+       addr >>= 1;
+       if (write)
+               addr &= ~(DMA_WRITE);
+       else
+               addr |= DMA_WRITE;
+
+       writeb((addr >> 24) & 0xff, &dregs->dma_latch);
+       writeb((addr >> 16) & 0xff, &dregs->dma_addr);
+       writeb((addr >>  8) & 0xff, &dregs->dma_addr);
+       writeb(addr & 0xff, &dregs->dma_addr);
+
+       scsi_esp_cmd(esp, ESP_CMD_DMA);
+       zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
+       zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
+       zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
+
+       scsi_esp_cmd(esp, cmd);
+}
+
+/* Blizzard 2060 DMA */
+
+static void zorro_esp_send_blz2060_dma_cmd(struct esp *esp, u32 addr,
+                       u32 esp_count, u32 dma_count, int write, u8 cmd)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+       struct blz2060_dma_registers __iomem *dregs = esp->dma_regs;
+       u8 phase = esp->sreg & ESP_STAT_PMASK;
+
+       zep->error = 0;
+       /* Use PIO if transferring message bytes to esp->command_block_dma */
+       if (phase == ESP_MIP && addr == esp->command_block_dma) {
+               zorro_esp_send_pio_cmd(esp, (u32) esp->command_block,
+                                       esp_count, dma_count, write, cmd);
+               return;
+       }
+
+       if (write)
+               /* DMA receive */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_FROM_DEVICE);
+       else
+               /* DMA send */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_TO_DEVICE);
+
+       addr >>= 1;
+       if (write)
+               addr &= ~(DMA_WRITE);
+       else
+               addr |= DMA_WRITE;
+
+       writeb(addr & 0xff, &dregs->dma_addr3);
+       writeb((addr >>  8) & 0xff, &dregs->dma_addr2);
+       writeb((addr >> 16) & 0xff, &dregs->dma_addr1);
+       writeb((addr >> 24) & 0xff, &dregs->dma_addr0);
+
+       scsi_esp_cmd(esp, ESP_CMD_DMA);
+       zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
+       zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
+       zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
+
+       scsi_esp_cmd(esp, cmd);
+}
+
+/* Cyberstorm I DMA */
+
+static void zorro_esp_send_cyber_dma_cmd(struct esp *esp, u32 addr,
+                       u32 esp_count, u32 dma_count, int write, u8 cmd)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+       struct cyber_dma_registers __iomem *dregs = esp->dma_regs;
+       u8 phase = esp->sreg & ESP_STAT_PMASK;
+       unsigned char *ctrl_data = &zep->ctrl_data;
+
+       zep->error = 0;
+       /* Use PIO if transferring message bytes to esp->command_block_dma */
+       if (phase == ESP_MIP && addr == esp->command_block_dma) {
+               zorro_esp_send_pio_cmd(esp, (u32) esp->command_block,
+                                       esp_count, dma_count, write, cmd);
+               return;
+       }
+
+       zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
+       zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
+       zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
+
+       if (write) {
+               /* DMA receive */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_FROM_DEVICE);
+               addr &= ~(1);
+       } else {
+               /* DMA send */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_TO_DEVICE);
+               addr |= 1;
+       }
+
+       writeb((addr >> 24) & 0xff, &dregs->dma_addr0);
+       writeb((addr >> 16) & 0xff, &dregs->dma_addr1);
+       writeb((addr >>  8) & 0xff, &dregs->dma_addr2);
+       writeb(addr & 0xff, &dregs->dma_addr3);
+
+       if (write)
+               *ctrl_data &= ~(CYBER_DMA_WRITE);
+       else
+               *ctrl_data |= CYBER_DMA_WRITE;
+
+       *ctrl_data &= ~(CYBER_DMA_Z3);  /* Z2, do 16 bit DMA */
+
+       writeb(*ctrl_data, &dregs->ctrl_reg);
+
+       scsi_esp_cmd(esp, cmd);
+}
+
+/* Cyberstorm II DMA */
+
+static void zorro_esp_send_cyberII_dma_cmd(struct esp *esp, u32 addr,
+                       u32 esp_count, u32 dma_count, int write, u8 cmd)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+       struct cyberII_dma_registers __iomem *dregs = esp->dma_regs;
+       u8 phase = esp->sreg & ESP_STAT_PMASK;
+
+       zep->error = 0;
+       /* Use PIO if transferring message bytes to esp->command_block_dma */
+       if (phase == ESP_MIP && addr == esp->command_block_dma) {
+               zorro_esp_send_pio_cmd(esp, (u32) esp->command_block,
+                                       esp_count, dma_count, write, cmd);
+               return;
+       }
+
+       zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
+       zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
+       zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
+
+       if (write) {
+               /* DMA receive */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_FROM_DEVICE);
+               addr &= ~(1);
+       } else {
+               /* DMA send */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_TO_DEVICE);
+               addr |= 1;
+       }
+
+       writeb((addr >> 24) & 0xff, &dregs->dma_addr0);
+       writeb((addr >> 16) & 0xff, &dregs->dma_addr1);
+       writeb((addr >>  8) & 0xff, &dregs->dma_addr2);
+       writeb(addr & 0xff, &dregs->dma_addr3);
+
+       scsi_esp_cmd(esp, cmd);
+}
+
+/* Fastlane DMA */
+
+static void zorro_esp_send_fastlane_dma_cmd(struct esp *esp, u32 addr,
+                       u32 esp_count, u32 dma_count, int write, u8 cmd)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+       struct fastlane_dma_registers __iomem *dregs = esp->dma_regs;
+       u8 phase = esp->sreg & ESP_STAT_PMASK;
+       unsigned char *ctrl_data = &zep->ctrl_data;
+
+       zep->error = 0;
+       /* Use PIO if transferring message bytes to esp->command_block_dma */
+       if (phase == ESP_MIP && addr == esp->command_block_dma) {
+               zorro_esp_send_pio_cmd(esp, (u32) esp->command_block,
+                                       esp_count, dma_count, write, cmd);
+               return;
+       }
+
+       zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
+       zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
+       zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
+
+       if (write) {
+               /* DMA receive */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_FROM_DEVICE);
+               addr &= ~(1);
+       } else {
+               /* DMA send */
+               dma_sync_single_for_device(esp->dev, addr, esp_count,
+                               DMA_TO_DEVICE);
+               addr |= 1;
+       }
+
+       writeb(0, &dregs->clear_strobe);
+       z_writel(addr, ((addr & 0x00ffffff) + zep->board_base));
+
+       if (write) {
+               *ctrl_data = (*ctrl_data & FASTLANE_DMA_MASK) |
+                               FASTLANE_DMA_ENABLE;
+       } else {
+               *ctrl_data = ((*ctrl_data & FASTLANE_DMA_MASK) |
+                               FASTLANE_DMA_ENABLE |
+                               FASTLANE_DMA_WRITE);
+       }
+
+       writeb(*ctrl_data, &dregs->ctrl_reg);
+
+       scsi_esp_cmd(esp, cmd);
+}
+
+static int zorro_esp_dma_error(struct esp *esp)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(esp->dev);
+
+       /* check for error in case we've been doing PIO */
+       if (zep->error == 1)
+               return 1;
+
+       /* do nothing - there seems to be no way to check for DMA errors */
+       return 0;
+}
+
+/* per-board ESP driver ops */
+
+static const struct esp_driver_ops blz1230_esp_ops = {
+       .esp_write8             = zorro_esp_write8,
+       .esp_read8              = zorro_esp_read8,
+       .map_single             = zorro_esp_map_single,
+       .map_sg                 = zorro_esp_map_sg,
+       .unmap_single           = zorro_esp_unmap_single,
+       .unmap_sg               = zorro_esp_unmap_sg,
+       .irq_pending            = zorro_esp_irq_pending,
+       .dma_length_limit       = zorro_esp_dma_length_limit,
+       .reset_dma              = zorro_esp_reset_dma,
+       .dma_drain              = zorro_esp_dma_drain,
+       .dma_invalidate         = zorro_esp_dma_invalidate,
+       .send_dma_cmd           = zorro_esp_send_blz1230_dma_cmd,
+       .dma_error              = zorro_esp_dma_error,
+};
+
+static const struct esp_driver_ops blz1230II_esp_ops = {
+       .esp_write8             = zorro_esp_write8,
+       .esp_read8              = zorro_esp_read8,
+       .map_single             = zorro_esp_map_single,
+       .map_sg                 = zorro_esp_map_sg,
+       .unmap_single           = zorro_esp_unmap_single,
+       .unmap_sg               = zorro_esp_unmap_sg,
+       .irq_pending            = zorro_esp_irq_pending,
+       .dma_length_limit       = zorro_esp_dma_length_limit,
+       .reset_dma              = zorro_esp_reset_dma,
+       .dma_drain              = zorro_esp_dma_drain,
+       .dma_invalidate         = zorro_esp_dma_invalidate,
+       .send_dma_cmd           = zorro_esp_send_blz1230II_dma_cmd,
+       .dma_error              = zorro_esp_dma_error,
+};
+
+static const struct esp_driver_ops blz2060_esp_ops = {
+       .esp_write8             = zorro_esp_write8,
+       .esp_read8              = zorro_esp_read8,
+       .map_single             = zorro_esp_map_single,
+       .map_sg                 = zorro_esp_map_sg,
+       .unmap_single           = zorro_esp_unmap_single,
+       .unmap_sg               = zorro_esp_unmap_sg,
+       .irq_pending            = zorro_esp_irq_pending,
+       .dma_length_limit       = zorro_esp_dma_length_limit,
+       .reset_dma              = zorro_esp_reset_dma,
+       .dma_drain              = zorro_esp_dma_drain,
+       .dma_invalidate         = zorro_esp_dma_invalidate,
+       .send_dma_cmd           = zorro_esp_send_blz2060_dma_cmd,
+       .dma_error              = zorro_esp_dma_error,
+};
+
+static const struct esp_driver_ops cyber_esp_ops = {
+       .esp_write8             = zorro_esp_write8,
+       .esp_read8              = zorro_esp_read8,
+       .map_single             = zorro_esp_map_single,
+       .map_sg                 = zorro_esp_map_sg,
+       .unmap_single           = zorro_esp_unmap_single,
+       .unmap_sg               = zorro_esp_unmap_sg,
+       .irq_pending            = cyber_esp_irq_pending,
+       .dma_length_limit       = zorro_esp_dma_length_limit,
+       .reset_dma              = zorro_esp_reset_dma,
+       .dma_drain              = zorro_esp_dma_drain,
+       .dma_invalidate         = zorro_esp_dma_invalidate,
+       .send_dma_cmd           = zorro_esp_send_cyber_dma_cmd,
+       .dma_error              = zorro_esp_dma_error,
+};
+
+static const struct esp_driver_ops cyberII_esp_ops = {
+       .esp_write8             = zorro_esp_write8,
+       .esp_read8              = zorro_esp_read8,
+       .map_single             = zorro_esp_map_single,
+       .map_sg                 = zorro_esp_map_sg,
+       .unmap_single           = zorro_esp_unmap_single,
+       .unmap_sg               = zorro_esp_unmap_sg,
+       .irq_pending            = zorro_esp_irq_pending,
+       .dma_length_limit       = zorro_esp_dma_length_limit,
+       .reset_dma              = zorro_esp_reset_dma,
+       .dma_drain              = zorro_esp_dma_drain,
+       .dma_invalidate         = zorro_esp_dma_invalidate,
+       .send_dma_cmd           = zorro_esp_send_cyberII_dma_cmd,
+       .dma_error              = zorro_esp_dma_error,
+};
+
+static const struct esp_driver_ops fastlane_esp_ops = {
+       .esp_write8             = zorro_esp_write8,
+       .esp_read8              = zorro_esp_read8,
+       .map_single             = zorro_esp_map_single,
+       .map_sg                 = zorro_esp_map_sg,
+       .unmap_single           = zorro_esp_unmap_single,
+       .unmap_sg               = zorro_esp_unmap_sg,
+       .irq_pending            = fastlane_esp_irq_pending,
+       .dma_length_limit       = zorro_esp_dma_length_limit,
+       .reset_dma              = zorro_esp_reset_dma,
+       .dma_drain              = zorro_esp_dma_drain,
+       .dma_invalidate         = fastlane_esp_dma_invalidate,
+       .send_dma_cmd           = zorro_esp_send_fastlane_dma_cmd,
+       .dma_error              = zorro_esp_dma_error,
+};
+
+/* Zorro driver config data */
+
+struct zorro_driver_data {
+       const char *name;
+       unsigned long offset;
+       unsigned long dma_offset;
+       int absolute;   /* offset is absolute address */
+       int scsi_option;
+       const struct esp_driver_ops *esp_ops;
+};
+
+/* board types */
+
+enum {
+       ZORRO_BLZ1230,
+       ZORRO_BLZ1230II,
+       ZORRO_BLZ2060,
+       ZORRO_CYBER,
+       ZORRO_CYBERII,
+       ZORRO_FASTLANE,
+};
+
+/* per-board config data */
+
+static const struct zorro_driver_data zorro_esp_boards[] = {
+       [ZORRO_BLZ1230] = {
+                               .name           = "Blizzard 1230",
+                               .offset         = 0x8000,
+                               .dma_offset     = 0x10000,
+                               .scsi_option    = 1,
+                               .esp_ops        = &blz1230_esp_ops,
+       },
+       [ZORRO_BLZ1230II] = {
+                               .name           = "Blizzard 1230II",
+                               .offset         = 0x10000,
+                               .dma_offset     = 0x10021,
+                               .scsi_option    = 1,
+                               .esp_ops        = &blz1230II_esp_ops,
+       },
+       [ZORRO_BLZ2060] = {
+                               .name           = "Blizzard 2060",
+                               .offset         = 0x1ff00,
+                               .dma_offset     = 0x1ffe0,
+                               .esp_ops        = &blz2060_esp_ops,
+       },
+       [ZORRO_CYBER] = {
+                               .name           = "CyberStormI",
+                               .offset         = 0xf400,
+                               .dma_offset     = 0xf800,
+                               .esp_ops        = &cyber_esp_ops,
+       },
+       [ZORRO_CYBERII] = {
+                               .name           = "CyberStormII",
+                               .offset         = 0x1ff03,
+                               .dma_offset     = 0x1ff43,
+                               .scsi_option    = 1,
+                               .esp_ops        = &cyberII_esp_ops,
+       },
+       [ZORRO_FASTLANE] = {
+                               .name           = "Fastlane",
+                               .offset         = 0x1000001,
+                               .dma_offset     = 0x1000041,
+                               .esp_ops        = &fastlane_esp_ops,
+       },
+};
+
+static const struct zorro_device_id zorro_esp_zorro_tbl[] = {
+       {       /* Blizzard 1230 IV */
+               .id = ZORRO_ID(PHASE5, 0x11, 0),
+               .driver_data = (unsigned long)ZORRO_BLZ1230,
+       },
+       {       /* Blizzard 1230 II (Zorro II) or Fastlane (Zorro III) */
+               .id = ZORRO_ID(PHASE5, 0x0B, 0),
+               .driver_data = (unsigned long)ZORRO_BLZ1230II,
+       },
+       {       /* Blizzard 2060 */
+               .id = ZORRO_ID(PHASE5, 0x18, 0),
+               .driver_data = (unsigned long)ZORRO_BLZ2060,
+       },
+       {       /* Cyberstorm */
+               .id = ZORRO_ID(PHASE5, 0x0C, 0),
+               .driver_data = (unsigned long)ZORRO_CYBER,
+       },
+       {       /* Cyberstorm II */
+               .id = ZORRO_ID(PHASE5, 0x19, 0),
+               .driver_data = (unsigned long)ZORRO_CYBERII,
+       },
+       { 0 }
+};
+MODULE_DEVICE_TABLE(zorro, zorro_esp_zorro_tbl);
+
+static int zorro_esp_probe(struct zorro_dev *z,
+                                      const struct zorro_device_id *ent)
+{
+       struct scsi_host_template *tpnt = &scsi_esp_template;
+       struct Scsi_Host *host;
+       struct esp *esp;
+       const struct zorro_driver_data *zdd;
+       struct zorro_esp_priv *zep;
+       unsigned long board, ioaddr, dmaaddr;
+       int err;
+
+       board = zorro_resource_start(z);
+       zdd = &zorro_esp_boards[(unsigned long)ent->driver_data];
+
+       pr_info("%s found at address 0x%lx.\n", zdd->name, board);
+
+       zep = kzalloc(sizeof(*zep), GFP_KERNEL);
+       if (!zep) {
+               pr_err("Can't allocate device private data!\n");
+               return -ENOMEM;
+       }
+
+       /* let's figure out whether we have a Zorro II or Zorro III board */
+       if ((z->rom.er_Type & ERT_TYPEMASK) == ERT_ZORROIII) {
+               if (board > 0xffffff)
+                       zep->zorro3 = 1;
+       } else {
+               /*
+                * Even though most of these boards identify as Zorro II,
+                * they are in fact CPU expansion slot boards and have full
+                * access to all of memory. Fix up DMA bitmask here.
+                */
+               z->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+       }
+
+       /*
+        * If Zorro III and ID matches Fastlane, our device table entry
+        * contains data for the Blizzard 1230 II board which does share the
+        * same ID. Fix up device table entry here.
+        * TODO: Some Cyberstom060 boards also share this ID but would need
+        * to use the Cyberstorm I driver data ... we catch this by checking
+        * for presence of ESP chip later, but don't try to fix up yet.
+        */
+       if (zep->zorro3 && ent->driver_data == (unsigned long)ZORRO_BLZ1230II) {
+               pr_info("%s at address 0x%lx is Fastlane Z3, fixing data!\n",
+                       zdd->name, board);
+               zdd = &zorro_esp_boards[(unsigned long)ZORRO_FASTLANE];
+       }
+
+       if (zdd->absolute) {
+               ioaddr  = zdd->offset;
+               dmaaddr = zdd->dma_offset;
+       } else {
+               ioaddr  = board + zdd->offset;
+               dmaaddr = board + zdd->dma_offset;
+       }
+
+       if (!zorro_request_device(z, zdd->name)) {
+               pr_err("cannot reserve region 0x%lx, abort\n",
+                      board);
+               err = -EBUSY;
+               goto fail_free_zep;
+       }
+
+       host = scsi_host_alloc(tpnt, sizeof(struct esp));
+
+       if (!host) {
+               pr_err("No host detected; board configuration problem?\n");
+               err = -ENOMEM;
+               goto fail_release_device;
+       }
+
+       host->base              = ioaddr;
+       host->this_id           = 7;
+
+       esp                     = shost_priv(host);
+       esp->host               = host;
+       esp->dev                = &z->dev;
+
+       esp->scsi_id            = host->this_id;
+       esp->scsi_id_mask       = (1 << esp->scsi_id);
+
+       esp->cfreq = 40000000;
+
+       zep->esp = esp;
+
+       dev_set_drvdata(esp->dev, zep);
+
+       /* additional setup required for Fastlane */
+       if (zep->zorro3 && ent->driver_data == (unsigned long)ZORRO_BLZ1230II) {
+               /* map full address space up to ESP base for DMA */
+               zep->board_base = ioremap_nocache(board,
+                                               FASTLANE_ESP_ADDR-1);
+               if (!zep->board_base) {
+                       pr_err("Cannot allocate board address space\n");
+                       err = -ENOMEM;
+                       goto fail_free_host;
+               }
+               /* initialize DMA control shadow register */
+               zep->ctrl_data = (FASTLANE_DMA_FCODE |
+                                 FASTLANE_DMA_EDI | FASTLANE_DMA_ESI);
+       }
+
+       esp->ops = zdd->esp_ops;
+
+       if (ioaddr > 0xffffff)
+               esp->regs = ioremap_nocache(ioaddr, 0x20);
+       else
+               /* ZorroII address space remapped nocache by early startup */
+               esp->regs = ZTWO_VADDR(ioaddr);
+
+       if (!esp->regs) {
+               err = -ENOMEM;
+               goto fail_unmap_fastlane;
+       }
+
+       /* Check whether a Blizzard 12x0 or CyberstormII really has SCSI */
+       if (zdd->scsi_option) {
+               zorro_esp_write8(esp, (ESP_CONFIG1_PENABLE | 7), ESP_CFG1);
+               if (zorro_esp_read8(esp, ESP_CFG1) != (ESP_CONFIG1_PENABLE|7)) {
+                       err = -ENODEV;
+                       goto fail_unmap_regs;
+               }
+       }
+
+       if (zep->zorro3) {
+               /*
+                * Only Fastlane Z3 for now - add switch for correct struct
+                * dma_registers size if adding any more
+                */
+               esp->dma_regs = ioremap_nocache(dmaaddr,
+                               sizeof(struct fastlane_dma_registers));
+       } else
+               /* ZorroII address space remapped nocache by early startup */
+               esp->dma_regs = ZTWO_VADDR(dmaaddr);
+
+       if (!esp->dma_regs) {
+               err = -ENOMEM;
+               goto fail_unmap_regs;
+       }
+
+       esp->command_block = dma_alloc_coherent(esp->dev, 16,
+                                               &esp->command_block_dma,
+                                               GFP_KERNEL);
+
+       if (!esp->command_block) {
+               err = -ENOMEM;
+               goto fail_unmap_dma_regs;
+       }
+
+       host->irq = IRQ_AMIGA_PORTS;
+       err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED,
+                         "Amiga Zorro ESP", esp);
+       if (err < 0) {
+               err = -ENODEV;
+               goto fail_free_command_block;
+       }
+
+       /* register the chip */
+       err = scsi_esp_register(esp, &z->dev);
+
+       if (err) {
+               err = -ENOMEM;
+               goto fail_free_irq;
+       }
+
+       return 0;
+
+fail_free_irq:
+       free_irq(host->irq, esp);
+
+fail_free_command_block:
+       dma_free_coherent(esp->dev, 16,
+                         esp->command_block,
+                         esp->command_block_dma);
+
+fail_unmap_dma_regs:
+       if (zep->zorro3)
+               iounmap(esp->dma_regs);
+
+fail_unmap_regs:
+       if (ioaddr > 0xffffff)
+               iounmap(esp->regs);
+
+fail_unmap_fastlane:
+       if (zep->zorro3)
+               iounmap(zep->board_base);
+
+fail_free_host:
+       scsi_host_put(host);
+
+fail_release_device:
+       zorro_release_device(z);
+
+fail_free_zep:
+       kfree(zep);
+
+       return err;
+}
+
+static void zorro_esp_remove(struct zorro_dev *z)
+{
+       struct zorro_esp_priv *zep = dev_get_drvdata(&z->dev);
+       struct esp *esp = zep->esp;
+       struct Scsi_Host *host = esp->host;
+
+       scsi_esp_unregister(esp);
+
+       free_irq(host->irq, esp);
+       dma_free_coherent(esp->dev, 16,
+                         esp->command_block,
+                         esp->command_block_dma);
+
+       if (zep->zorro3) {
+               iounmap(zep->board_base);
+               iounmap(esp->dma_regs);
+       }
+
+       if (host->base > 0xffffff)
+               iounmap(esp->regs);
+
+       scsi_host_put(host);
+
+       zorro_release_device(z);
+
+       kfree(zep);
+}
+
+static struct zorro_driver zorro_esp_driver = {
+       .name     = KBUILD_MODNAME,
+       .id_table = zorro_esp_zorro_tbl,
+       .probe    = zorro_esp_probe,
+       .remove   = zorro_esp_remove,
+};
+
+static int __init zorro_esp_scsi_init(void)
+{
+       return zorro_register_driver(&zorro_esp_driver);
+}
+
+static void __exit zorro_esp_scsi_exit(void)
+{
+       zorro_unregister_driver(&zorro_esp_driver);
+}
+
+module_init(zorro_esp_scsi_init);
+module_exit(zorro_esp_scsi_exit);
-- 
1.7.0.4

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