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Diffstat (limited to 'drivers/scsi/sgiwd93.c')
-rw-r--r--drivers/scsi/sgiwd93.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/drivers/scsi/sgiwd93.c b/drivers/scsi/sgiwd93.c
new file mode 100644
index 000000000..cf1030c9d
--- /dev/null
+++ b/drivers/scsi/sgiwd93.c
@@ -0,0 +1,324 @@
+/*
+ * 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_sync_single_for_device(hd->dev, hd->dma,
+ (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;
+}
+
+/*
+ * 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_host_reset_handler = wd33c93_host_reset,
+ .can_queue = 16,
+ .this_id = 7,
+ .sg_tablesize = SG_ALL,
+ .cmd_per_lun = 8,
+ .dma_boundary = PAGE_SIZE - 1,
+};
+
+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, DMA_TO_DEVICE, 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,
+ DMA_TO_DEVICE);
+out_put:
+ scsi_host_put(host);
+out:
+
+ return err;
+}
+
+static int 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,
+ DMA_TO_DEVICE);
+ 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 01:55:34 +0000