scsi: fdomain: Resurrect driver - ISA support

Future Domain 16xx ISA SCSI support card support.

Tested on IBM 92F0330 card (18C50 chip) with v1.00 BIOS.

Signed-off-by: Ondrej Zary <linux@zary.sk>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

3 files changed, 237 insertions, 0 deletions

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index b66c624affb0..e365787bf698 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -662,6 +662,20 @@ config SCSI_FDOMAIN_PCI
           To compile this driver as a module, choose M here: the
           module will be called fdomain_pci.
 
+config SCSI_FDOMAIN_ISA
+        tristate "Future Domain 16xx ISA SCSI support"
+        depends on ISA && SCSI
+        select CHECK_SIGNATURE
+        select SCSI_FDOMAIN
+        help
+          This is support for Future Domain's 16-bit SCSI host adapters
+          (TMC-1660/1680, TMC-1650/1670, TMC-1610M/MER/MEX) and other adapters
+          with ISA bus based on the Future Domain chipsets (Quantum ISA-200S,
+          ISA-250MG; and at least one IBM board).
+
+          To compile this driver as a module, choose M here: the
+          module will be called fdomain_isa.
+
 config SCSI_GDTH
         tristate "Intel/ICP (former GDT SCSI Disk Array) RAID Controller support"
         depends on PCI && SCSI
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index f2cea7032419..aeda53901064 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -78,6 +78,7 @@ obj-$(CONFIG_SCSI_ISCI)		+= isci/
 obj-$(CONFIG_SCSI_IPS)          += ips.o
 obj-$(CONFIG_SCSI_FDOMAIN)      += fdomain.o
 obj-$(CONFIG_SCSI_FDOMAIN_PCI)  += fdomain_pci.o
+obj-$(CONFIG_SCSI_FDOMAIN_ISA)  += fdomain_isa.o
 obj-$(CONFIG_SCSI_GENERIC_NCR5380) += g_NCR5380.o
 obj-$(CONFIG_SCSI_QLOGIC_FAS)   += qlogicfas408.o       qlogicfas.o
 obj-$(CONFIG_PCMCIA_QLOGIC)     += qlogicfas408.o
diff --git a/drivers/scsi/fdomain_isa.c b/drivers/scsi/fdomain_isa.c
new file mode 100644
index 000000000000..bca5d56f12aa
--- /dev/null
+++ b/drivers/scsi/fdomain_isa.c
@@ -0,0 +1,222 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/isa.h>
+#include <scsi/scsi_host.h>
+#include "fdomain.h"
+
+#define MAXBOARDS_PARAM 4
+static int io[MAXBOARDS_PARAM] = { 0, 0, 0, 0 };
+module_param_hw_array(io, int, ioport, NULL, 0);
+MODULE_PARM_DESC(io, "base I/O address of controller (0x140, 0x150, 0x160, 0x170)");
+
+static int irq[MAXBOARDS_PARAM] = { 0, 0, 0, 0 };
+module_param_hw_array(irq, int, irq, NULL, 0);
+MODULE_PARM_DESC(irq, "IRQ of controller (0=auto [default])");
+
+static int scsi_id[MAXBOARDS_PARAM] = { 0, 0, 0, 0 };
+module_param_hw_array(scsi_id, int, other, NULL, 0);
+MODULE_PARM_DESC(scsi_id, "SCSI ID of controller (default = 7)");
+
+static unsigned long addresses[] = {
+        0xc8000,
+        0xca000,
+        0xce000,
+        0xde000,
+};
+#define ADDRESS_COUNT ARRAY_SIZE(addresses)
+
+static unsigned short ports[] = { 0x140, 0x150, 0x160, 0x170 };
+#define PORT_COUNT ARRAY_SIZE(ports)
+
+static unsigned short irqs[] = { 3, 5, 10, 11, 12, 14, 15, 0 };
+
+/* This driver works *ONLY* for Future Domain cards using the TMC-1800,
+ * TMC-18C50, or TMC-18C30 chip.  This includes models TMC-1650, 1660, 1670,
+ * and 1680. These are all 16-bit cards.
+ * BIOS versions prior to 3.2 assigned SCSI ID 6 to SCSI adapter.
+ *
+ * The following BIOS signature signatures are for boards which do *NOT*
+ * work with this driver (these TMC-8xx and TMC-9xx boards may work with the
+ * Seagate driver):
+ *
+ * FUTURE DOMAIN CORP. (C) 1986-1988 V4.0I 03/16/88
+ * FUTURE DOMAIN CORP. (C) 1986-1989 V5.0C2/14/89
+ * FUTURE DOMAIN CORP. (C) 1986-1989 V6.0A7/28/89
+ * FUTURE DOMAIN CORP. (C) 1986-1990 V6.0105/31/90
+ * FUTURE DOMAIN CORP. (C) 1986-1990 V6.0209/18/90
+ * FUTURE DOMAIN CORP. (C) 1986-1990 V7.009/18/90
+ * FUTURE DOMAIN CORP. (C) 1992 V8.00.004/02/92
+ *
+ * (The cards which do *NOT* work are all 8-bit cards -- although some of
+ * them have a 16-bit form-factor, the upper 8-bits are used only for IRQs
+ * and are *NOT* used for data. You can tell the difference by following
+ * the tracings on the circuit board -- if only the IRQ lines are involved,
+ * you have a "8-bit" card, and should *NOT* use this driver.)
+ */
+
+static struct signature {
+        const char *signature;
+        int offset;
+        int length;
+        int this_id;
+        int base_offset;
+} signatures[] = {
+/*          1         2         3         4         5         6 */
+/* 123456789012345678901234567890123456789012345678901234567890 */
+{ "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V2.07/28/89",  5, 50,  6, 0x1fcc },
+{ "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V1.07/28/89",  5, 50,  6, 0x1fcc },
+{ "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V2.07/28/89", 72, 50,  6, 0x1fa2 },
+{ "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V2.0",        73, 43,  6, 0x1fa2 },
+{ "FUTURE DOMAIN CORP. (C) 1991 1800-V2.0.",            72, 39,  6, 0x1fa3 },
+{ "FUTURE DOMAIN CORP. (C) 1992 V3.00.004/02/92",        5, 44,  6, 0 },
+{ "FUTURE DOMAIN TMC-18XX (C) 1993 V3.203/12/93",        5, 44,  7, 0 },
+{ "IBM F1 P2 BIOS v1.0011/09/92",                        5, 28,  7, 0x1ff3 },
+{ "IBM F1 P2 BIOS v1.0104/29/93",                        5, 28,  7, 0 },
+{ "Future Domain Corp. V1.0008/18/93",                   5, 33,  7, 0 },
+{ "Future Domain Corp. V2.0108/18/93",                   5, 33,  7, 0 },
+{ "FUTURE DOMAIN CORP.  V3.5008/18/93",                  5, 34,  7, 0 },
+{ "FUTURE DOMAIN 18c30/18c50/1800 (C) 1994 V3.5",        5, 44,  7, 0 },
+{ "FUTURE DOMAIN CORP.  V3.6008/18/93",                  5, 34,  7, 0 },
+{ "FUTURE DOMAIN CORP.  V3.6108/18/93",                  5, 34,  7, 0 },
+};
+#define SIGNATURE_COUNT ARRAY_SIZE(signatures)
+
+static int fdomain_isa_match(struct device *dev, unsigned int ndev)
+{
+        struct Scsi_Host *sh;
+        int i, base = 0, irq = 0;
+        unsigned long bios_base = 0;
+        struct signature *sig = NULL;
+        void __iomem *p;
+        static struct signature *saved_sig;
+        int this_id = 7;
+
+        if (ndev < ADDRESS_COUNT) {     /* scan supported ISA BIOS addresses */
+                p = ioremap(addresses[ndev], FDOMAIN_BIOS_SIZE);
+                if (!p)
+                        return 0;
+                for (i = 0; i < SIGNATURE_COUNT; i++)
+                        if (check_signature(p + signatures[i].offset,
+                                            signatures[i].signature,
+                                            signatures[i].length))
+                                break;
+                if (i == SIGNATURE_COUNT)       /* no signature found */
+                        goto fail_unmap;
+                sig = &signatures[i];
+                bios_base = addresses[ndev];
+                /* read I/O base from BIOS area */
+                if (sig->base_offset)
+                        base = readb(p + sig->base_offset) +
+                              (readb(p + sig->base_offset + 1) << 8);
+                iounmap(p);
+                if (base)
+                        dev_info(dev, "BIOS at 0x%lx specifies I/O base 0x%x\n",
+                                 bios_base, base);
+                else
+                        dev_info(dev, "BIOS at 0x%lx\n", bios_base);
+                if (!base) {    /* no I/O base in BIOS area */
+                        /* save BIOS signature for later use in port probing */
+                        saved_sig = sig;
+                        return 0;
+                }
+        } else  /* scan supported I/O ports */
+                base = ports[ndev - ADDRESS_COUNT];
+
+        /* use saved BIOS signature if present */
+        if (!sig && saved_sig)
+                sig = saved_sig;
+
+        if (!request_region(base, FDOMAIN_REGION_SIZE, "fdomain_isa"))
+                return 0;
+
+        irq = irqs[(inb(base + Configuration1) & 0x0e) >> 1];
+
+
+        if (sig)
+                this_id = sig->this_id;
+
+        sh = fdomain_create(base, irq, this_id, dev);
+        if (!sh) {
+                release_region(base, FDOMAIN_REGION_SIZE);
+                return 0;
+        }
+
+        dev_set_drvdata(dev, sh);
+        return 1;
+fail_unmap:
+        iounmap(p);
+        return 0;
+}
+
+static int fdomain_isa_param_match(struct device *dev, unsigned int ndev)
+{
+        struct Scsi_Host *sh;
+        int irq_ = irq[ndev];
+
+        if (!io[ndev])
+                return 0;
+
+        if (!request_region(io[ndev], FDOMAIN_REGION_SIZE, "fdomain_isa")) {
+                dev_err(dev, "base 0x%x already in use", io[ndev]);
+                return 0;
+        }
+
+        if (irq_ <= 0)
+                irq_ = irqs[(inb(io[ndev] + Configuration1) & 0x0e) >> 1];
+
+        sh = fdomain_create(io[ndev], irq_, scsi_id[ndev], dev);
+        if (!sh) {
+                dev_err(dev, "controller not found at base 0x%x", io[ndev]);
+                release_region(io[ndev], FDOMAIN_REGION_SIZE);
+                return 0;
+        }
+
+        dev_set_drvdata(dev, sh);
+        return 1;
+}
+
+static int fdomain_isa_remove(struct device *dev, unsigned int ndev)
+{
+        struct Scsi_Host *sh = dev_get_drvdata(dev);
+        int base = sh->io_port;
+
+        fdomain_destroy(sh);
+        release_region(base, FDOMAIN_REGION_SIZE);
+        dev_set_drvdata(dev, NULL);
+        return 0;
+}
+
+static struct isa_driver fdomain_isa_driver = {
+        .match          = fdomain_isa_match,
+        .remove         = fdomain_isa_remove,
+        .driver = {
+                .name   = "fdomain_isa",
+                .pm     = FDOMAIN_PM_OPS,
+        },
+};
+
+static int __init fdomain_isa_init(void)
+{
+        int isa_probe_count = ADDRESS_COUNT + PORT_COUNT;
+
+        if (io[0]) {    /* use module parameters if present */
+                fdomain_isa_driver.match = fdomain_isa_param_match;
+                isa_probe_count = MAXBOARDS_PARAM;
+        }
+
+        return isa_register_driver(&fdomain_isa_driver, isa_probe_count);
+}
+
+static void __exit fdomain_isa_exit(void)
+{
+        isa_unregister_driver(&fdomain_isa_driver);
+}
+
+module_init(fdomain_isa_init);
+module_exit(fdomain_isa_exit);
+
+MODULE_AUTHOR("Ondrej Zary, Rickard E. Faith");
+MODULE_DESCRIPTION("Future Domain TMC-16x0 ISA SCSI driver");
+MODULE_LICENSE("GPL");