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Diffstat (limited to 'drivers/scsi/sgiwd93.c')
-rw-r--r--drivers/scsi/sgiwd93.c337
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/scsi/sgiwd93.c b/drivers/scsi/sgiwd93.c
new file mode 100644
index 000000000000..270f2aa88faa
--- /dev/null
+++ b/drivers/scsi/sgiwd93.c
@@ -0,0 +1,337 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
+ * Copyright (C) 2001 Florian Lohoff (flo@rfc822.org)
+ * Copyright (C) 2003 Ralf Baechle (ralf@linux-mips.org)
+ *
+ * (In all truth, Jed Schimmel wrote all this code.)
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/blkdev.h>
+#include <linux/version.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/spinlock.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/sgialib.h>
+#include <asm/sgi/sgi.h>
+#include <asm/sgi/mc.h>
+#include <asm/sgi/hpc3.h>
+#include <asm/sgi/ip22.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "wd33c93.h"
+#include "sgiwd93.h"
+
+#include <linux/stat.h>
+
+#if 0
+#define DPRINTK(args...) printk(args)
+#else
+#define DPRINTK(args...)
+#endif
+
+#define HDATA(ptr) ((struct ip22_hostdata *)((ptr)->hostdata))
+
+struct ip22_hostdata {
+ struct WD33C93_hostdata wh;
+ struct hpc_data {
+ dma_addr_t dma;
+ void * cpu;
+ } hd;
+};
+
+struct hpc_chunk {
+ struct hpc_dma_desc desc;
+ u32 _padding; /* align to quadword boundary */
+};
+
+struct Scsi_Host *sgiwd93_host;
+struct Scsi_Host *sgiwd93_host1;
+
+/* Wuff wuff, wuff, wd33c93.c, wuff wuff, object oriented, bow wow. */
+static inline void write_wd33c93_count(const wd33c93_regs regs,
+ unsigned long value)
+{
+ *regs.SASR = WD_TRANSFER_COUNT_MSB;
+ mb();
+ *regs.SCMD = ((value >> 16) & 0xff);
+ *regs.SCMD = ((value >> 8) & 0xff);
+ *regs.SCMD = ((value >> 0) & 0xff);
+ mb();
+}
+
+static inline unsigned long read_wd33c93_count(const wd33c93_regs regs)
+{
+ unsigned long value;
+
+ *regs.SASR = WD_TRANSFER_COUNT_MSB;
+ mb();
+ value = ((*regs.SCMD & 0xff) << 16);
+ value |= ((*regs.SCMD & 0xff) << 8);
+ value |= ((*regs.SCMD & 0xff) << 0);
+ mb();
+ return value;
+}
+
+static irqreturn_t sgiwd93_intr(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct Scsi_Host * host = (struct Scsi_Host *) dev_id;
+ unsigned long flags;
+
+ spin_lock_irqsave(host->host_lock, flags);
+ wd33c93_intr(host);
+ spin_unlock_irqrestore(host->host_lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static inline
+void fill_hpc_entries(struct hpc_chunk *hcp, Scsi_Cmnd *cmd, int datainp)
+{
+ unsigned long len = cmd->SCp.this_residual;
+ void *addr = cmd->SCp.ptr;
+ dma_addr_t physaddr;
+ unsigned long count;
+
+ physaddr = dma_map_single(NULL, addr, len, cmd->sc_data_direction);
+ cmd->SCp.dma_handle = physaddr;
+
+ while (len) {
+ /*
+ * even cntinfo could be up to 16383, without
+ * magic only 8192 works correctly
+ */
+ count = len > 8192 ? 8192 : len;
+ hcp->desc.pbuf = physaddr;
+ hcp->desc.cntinfo = count;
+ hcp++;
+ len -= count;
+ physaddr += count;
+ }
+
+ /*
+ * To make sure, if we trip an HPC bug, that we transfer every single
+ * byte, we tag on an extra zero length dma descriptor at the end of
+ * the chain.
+ */
+ hcp->desc.pbuf = 0;
+ hcp->desc.cntinfo = HPCDMA_EOX;
+}
+
+static int dma_setup(Scsi_Cmnd *cmd, int datainp)
+{
+ struct ip22_hostdata *hdata = HDATA(cmd->device->host);
+ struct hpc3_scsiregs *hregs =
+ (struct hpc3_scsiregs *) cmd->device->host->base;
+ struct hpc_chunk *hcp = (struct hpc_chunk *) hdata->hd.cpu;
+
+ DPRINTK("dma_setup: datainp<%d> hcp<%p> ", datainp, hcp);
+
+ hdata->wh.dma_dir = datainp;
+
+ /*
+ * wd33c93 shouldn't pass us bogus dma_setups, but it does:-( The
+ * other wd33c93 drivers deal with it the same way (which isn't that
+ * obvious). IMHO a better fix would be, not to do these dma setups
+ * in the first place.
+ */
+ if (cmd->SCp.ptr == NULL || cmd->SCp.this_residual == 0)
+ return 1;
+
+ fill_hpc_entries(hcp, cmd, datainp);
+
+ DPRINTK(" HPCGO\n");
+
+ /* Start up the HPC. */
+ hregs->ndptr = hdata->hd.dma;
+ if (datainp)
+ hregs->ctrl = HPC3_SCTRL_ACTIVE;
+ else
+ hregs->ctrl = HPC3_SCTRL_ACTIVE | HPC3_SCTRL_DIR;
+
+ return 0;
+}
+
+static void dma_stop(struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
+ int status)
+{
+ struct ip22_hostdata *hdata = HDATA(instance);
+ struct hpc3_scsiregs *hregs;
+
+ if (!SCpnt)
+ return;
+
+ hregs = (struct hpc3_scsiregs *) SCpnt->device->host->base;
+
+ DPRINTK("dma_stop: status<%d> ", status);
+
+ /* First stop the HPC and flush it's FIFO. */
+ if (hdata->wh.dma_dir) {
+ hregs->ctrl |= HPC3_SCTRL_FLUSH;
+ while (hregs->ctrl & HPC3_SCTRL_ACTIVE)
+ barrier();
+ }
+ hregs->ctrl = 0;
+ dma_unmap_single(NULL, SCpnt->SCp.dma_handle, SCpnt->SCp.this_residual,
+ SCpnt->sc_data_direction);
+
+ DPRINTK("\n");
+}
+
+void sgiwd93_reset(unsigned long base)
+{
+ struct hpc3_scsiregs *hregs = (struct hpc3_scsiregs *) base;
+
+ hregs->ctrl = HPC3_SCTRL_CRESET;
+ udelay(50);
+ hregs->ctrl = 0;
+}
+
+static inline void init_hpc_chain(struct hpc_data *hd)
+{
+ struct hpc_chunk *hcp = (struct hpc_chunk *) hd->cpu;
+ struct hpc_chunk *dma = (struct hpc_chunk *) hd->dma;
+ unsigned long start, end;
+
+ start = (unsigned long) hcp;
+ end = start + PAGE_SIZE;
+ while (start < end) {
+ hcp->desc.pnext = (u32) (dma + 1);
+ hcp->desc.cntinfo = HPCDMA_EOX;
+ hcp++; dma++;
+ start += sizeof(struct hpc_chunk);
+ };
+ hcp--;
+ hcp->desc.pnext = hd->dma;
+}
+
+static struct Scsi_Host * __init sgiwd93_setup_scsi(
+ Scsi_Host_Template *SGIblows, int unit, int irq,
+ struct hpc3_scsiregs *hregs, unsigned char *wdregs)
+{
+ struct ip22_hostdata *hdata;
+ struct Scsi_Host *host;
+ wd33c93_regs regs;
+
+ host = scsi_register(SGIblows, sizeof(struct ip22_hostdata));
+ if (!host)
+ return NULL;
+
+ host->base = (unsigned long) hregs;
+ host->irq = irq;
+
+ hdata = HDATA(host);
+ hdata->hd.cpu = dma_alloc_coherent(NULL, PAGE_SIZE, &hdata->hd.dma,
+ GFP_KERNEL);
+ if (!hdata->hd.cpu) {
+ printk(KERN_WARNING "sgiwd93: Could not allocate memory for "
+ "host %d buffer.\n", unit);
+ goto out_unregister;
+ }
+ init_hpc_chain(&hdata->hd);
+
+ regs.SASR = wdregs + 3;
+ regs.SCMD = wdregs + 7;
+
+ wd33c93_init(host, regs, dma_setup, dma_stop, WD33C93_FS_16_20);
+
+ hdata->wh.no_sync = 0;
+
+ if (request_irq(irq, sgiwd93_intr, 0, "SGI WD93", (void *) host)) {
+ printk(KERN_WARNING "sgiwd93: Could not register irq %d "
+ "for host %d.\n", irq, unit);
+ goto out_free;
+ }
+ return host;
+
+out_free:
+ dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma);
+ wd33c93_release();
+
+out_unregister:
+ scsi_unregister(host);
+
+ return NULL;
+}
+
+int __init sgiwd93_detect(Scsi_Host_Template *SGIblows)
+{
+ int found = 0;
+
+ SGIblows->proc_name = "SGIWD93";
+ sgiwd93_host = sgiwd93_setup_scsi(SGIblows, 0, SGI_WD93_0_IRQ,
+ &hpc3c0->scsi_chan0,
+ (unsigned char *)hpc3c0->scsi0_ext);
+ if (sgiwd93_host)
+ found++;
+
+ /* Set up second controller on the Indigo2 */
+ if (ip22_is_fullhouse()) {
+ sgiwd93_host1 = sgiwd93_setup_scsi(SGIblows, 1, SGI_WD93_1_IRQ,
+ &hpc3c0->scsi_chan1,
+ (unsigned char *)hpc3c0->scsi1_ext);
+ if (sgiwd93_host1)
+ found++;
+ }
+
+ return found;
+}
+
+int sgiwd93_release(struct Scsi_Host *instance)
+{
+ struct ip22_hostdata *hdata = HDATA(instance);
+ int irq = 0;
+
+ if (sgiwd93_host && sgiwd93_host == instance)
+ irq = SGI_WD93_0_IRQ;
+ else if (sgiwd93_host1 && sgiwd93_host1 == instance)
+ irq = SGI_WD93_1_IRQ;
+
+ free_irq(irq, sgiwd93_intr);
+ dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma);
+ wd33c93_release();
+
+ return 1;
+}
+
+static int sgiwd93_bus_reset(Scsi_Cmnd *cmd)
+{
+ /* FIXME perform bus-specific reset */
+ wd33c93_host_reset(cmd);
+ return SUCCESS;
+}
+
+/*
+ * Kludge alert - the SCSI code calls the abort and reset method with int
+ * arguments not with pointers. So this is going to blow up beautyfully
+ * on 64-bit systems with memory outside the compat address spaces.
+ */
+static Scsi_Host_Template driver_template = {
+ .proc_name = "SGIWD93",
+ .name = "SGI WD93",
+ .detect = sgiwd93_detect,
+ .release = sgiwd93_release,
+ .queuecommand = wd33c93_queuecommand,
+ .eh_abort_handler = wd33c93_abort,
+ .eh_bus_reset_handler = sgiwd93_bus_reset,
+ .eh_host_reset_handler = wd33c93_host_reset,
+ .can_queue = CAN_QUEUE,
+ .this_id = 7,
+ .sg_tablesize = SG_ALL,
+ .cmd_per_lun = CMD_PER_LUN,
+ .use_clustering = DISABLE_CLUSTERING,
+};
+#include "scsi_module.c"
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