Initial import

1 files changed, 337 insertions, 0 deletions

diff --git a/drivers/scsi/sgiwd93.c b/drivers/scsi/sgiwd93.c
new file mode 100644
index 000000000..6d215e2fb
--- /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 (davem@davemloft.net)
+ * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
+ * Copyright (C) 2001 Florian Lohoff (flo@rfc822.org)
+ * Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org)
+ * 
+ * (In all truth, Jed Schimmel wrote all this code.)
+ */
+
+#undef DEBUG
+
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/gfp.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#include <asm/sgi/hpc3.h>
+#include <asm/sgi/ip22.h>
+#include <asm/sgi/wd.h>
+
+#include "scsi.h"
+#include "wd33c93.h"
+
+struct ip22_hostdata {
+	struct WD33C93_hostdata wh;
+	dma_addr_t dma;
+	void *cpu;
+	struct device *dev;
+};
+
+#define host_to_hostdata(host) ((struct ip22_hostdata *)((host)->hostdata))
+
+struct hpc_chunk {
+	struct hpc_dma_desc desc;
+	u32 _padding;	/* align to quadword boundary */
+};
+
+/* space for hpc dma descriptors */
+#define HPC_DMA_SIZE   PAGE_SIZE
+
+#define DMA_DIR(d)   ((d == DATA_OUT_DIR) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
+
+static irqreturn_t sgiwd93_intr(int irq, void *dev_id)
+{
+	struct Scsi_Host * 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 ip22_hostdata *hd, struct scsi_cmnd *cmd, int din)
+{
+	unsigned long len = cmd->SCp.this_residual;
+	void *addr = cmd->SCp.ptr;
+	dma_addr_t physaddr;
+	unsigned long count;
+	struct hpc_chunk *hcp;
+
+	physaddr = dma_map_single(hd->dev, addr, len, DMA_DIR(din));
+	cmd->SCp.dma_handle = physaddr;
+	hcp = hd->cpu;
+
+	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;
+	dma_cache_sync(hd->dev, hd->cpu,
+		       (unsigned long)(hcp + 1) - (unsigned long)hd->cpu,
+		       DMA_TO_DEVICE);
+}
+
+static int dma_setup(struct scsi_cmnd *cmd, int datainp)
+{
+	struct ip22_hostdata *hdata = host_to_hostdata(cmd->device->host);
+	struct hpc3_scsiregs *hregs =
+		(struct hpc3_scsiregs *) cmd->device->host->base;
+
+	pr_debug("dma_setup: datainp<%d> hcp<%p> ", datainp, hdata->cpu);
+
+	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(hdata, cmd, datainp);
+
+	pr_debug(" HPCGO\n");
+
+	/* Start up the HPC. */
+	hregs->ndptr = hdata->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, struct scsi_cmnd *SCpnt,
+		     int status)
+{
+	struct ip22_hostdata *hdata = host_to_hostdata(instance);
+	struct hpc3_scsiregs *hregs;
+
+	if (!SCpnt)
+		return;
+
+	if (SCpnt->SCp.ptr == NULL || SCpnt->SCp.this_residual == 0)
+		return;
+
+	hregs = (struct hpc3_scsiregs *) SCpnt->device->host->base;
+
+	pr_debug("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(hdata->dev, SCpnt->SCp.dma_handle,
+			 SCpnt->SCp.this_residual,
+			 DMA_DIR(hdata->wh.dma_dir));
+
+	pr_debug("\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;
+}
+EXPORT_SYMBOL_GPL(sgiwd93_reset);
+
+static inline void init_hpc_chain(struct ip22_hostdata *hdata)
+{
+	struct hpc_chunk *hcp = (struct hpc_chunk *)hdata->cpu;
+	dma_addr_t dma = hdata->dma;
+	unsigned long start, end;
+
+	start = (unsigned long) hcp;
+	end = start + HPC_DMA_SIZE;
+	while (start < end) {
+		hcp->desc.pnext = (u32) (dma + sizeof(struct hpc_chunk));
+		hcp->desc.cntinfo = HPCDMA_EOX;
+		hcp++;
+		dma += sizeof(struct hpc_chunk);
+		start += sizeof(struct hpc_chunk);
+	};
+	hcp--;
+	hcp->desc.pnext = hdata->dma;
+}
+
+static int sgiwd93_bus_reset(struct scsi_cmnd *cmd)
+{
+	/* FIXME perform bus-specific reset */
+
+	/* FIXME 2: kill this function, and let midlayer fallback
+	   to the same result, calling wd33c93_host_reset() */
+
+	spin_lock_irq(cmd->device->host->host_lock);
+	wd33c93_host_reset(cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
+	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 struct scsi_host_template sgiwd93_template = {
+	.module			= THIS_MODULE,
+	.proc_name		= "SGIWD93",
+	.name			= "SGI WD93",
+	.queuecommand		= wd33c93_queuecommand,
+	.eh_abort_handler	= wd33c93_abort,
+	.eh_bus_reset_handler	= sgiwd93_bus_reset,
+	.eh_host_reset_handler	= wd33c93_host_reset,
+	.can_queue		= 16,
+	.this_id		= 7,
+	.sg_tablesize		= SG_ALL,
+	.cmd_per_lun		= 8,
+	.use_clustering		= DISABLE_CLUSTERING,
+};
+
+static int sgiwd93_probe(struct platform_device *pdev)
+{
+	struct sgiwd93_platform_data *pd = pdev->dev.platform_data;
+	unsigned char *wdregs = pd->wdregs;
+	struct hpc3_scsiregs *hregs = pd->hregs;
+	struct ip22_hostdata *hdata;
+	struct Scsi_Host *host;
+	wd33c93_regs regs;
+	unsigned int unit = pd->unit;
+	unsigned int irq = pd->irq;
+	int err;
+
+	host = scsi_host_alloc(&sgiwd93_template, sizeof(struct ip22_hostdata));
+	if (!host) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	host->base = (unsigned long) hregs;
+	host->irq = irq;
+
+	hdata = host_to_hostdata(host);
+	hdata->dev = &pdev->dev;
+	hdata->cpu = dma_alloc_noncoherent(&pdev->dev, HPC_DMA_SIZE,
+					   &hdata->dma, GFP_KERNEL);
+	if (!hdata->cpu) {
+		printk(KERN_WARNING "sgiwd93: Could not allocate memory for "
+		       "host %d buffer.\n", unit);
+		err = -ENOMEM;
+		goto out_put;
+	}
+
+	init_hpc_chain(hdata);
+
+	regs.SASR = wdregs + 3;
+	regs.SCMD = wdregs + 7;
+
+	hdata->wh.no_sync = 0;
+	hdata->wh.fast = 1;
+	hdata->wh.dma_mode = CTRL_BURST;
+
+	wd33c93_init(host, regs, dma_setup, dma_stop, WD33C93_FS_MHZ(20));
+
+	err = request_irq(irq, sgiwd93_intr, 0, "SGI WD93", host);
+	if (err) {
+		printk(KERN_WARNING "sgiwd93: Could not register irq %d "
+		       "for host %d.\n", irq, unit);
+		goto out_free;
+	}
+
+	platform_set_drvdata(pdev, host);
+
+	err = scsi_add_host(host, NULL);
+	if (err)
+		goto out_irq;
+
+	scsi_scan_host(host);
+
+	return 0;
+
+out_irq:
+	free_irq(irq, host);
+out_free:
+	dma_free_noncoherent(&pdev->dev, HPC_DMA_SIZE, hdata->cpu, hdata->dma);
+out_put:
+	scsi_host_put(host);
+out:
+
+	return err;
+}
+
+static int __exit sgiwd93_remove(struct platform_device *pdev)
+{
+	struct Scsi_Host *host = platform_get_drvdata(pdev);
+	struct ip22_hostdata *hdata = (struct ip22_hostdata *) host->hostdata;
+	struct sgiwd93_platform_data *pd = pdev->dev.platform_data;
+
+	scsi_remove_host(host);
+	free_irq(pd->irq, host);
+	dma_free_noncoherent(&pdev->dev, HPC_DMA_SIZE, hdata->cpu, hdata->dma);
+	scsi_host_put(host);
+	return 0;
+}
+
+static struct platform_driver sgiwd93_driver = {
+	.probe  = sgiwd93_probe,
+	.remove = sgiwd93_remove,
+	.driver = {
+		.name   = "sgiwd93",
+	}
+};
+
+static int __init sgiwd93_module_init(void)
+{
+	return platform_driver_register(&sgiwd93_driver);
+}
+
+static void __exit sgiwd93_module_exit(void)
+{
+	return platform_driver_unregister(&sgiwd93_driver);
+}
+
+module_init(sgiwd93_module_init);
+module_exit(sgiwd93_module_exit);
+
+MODULE_DESCRIPTION("SGI WD33C93 driver");
+MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sgiwd93");