Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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"