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324 lines
7.8 KiB
324 lines
7.8 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1996 David S. Miller ([email protected]) |
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* Copyright (C) 1999 Andrew R. Baker ([email protected]) |
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* Copyright (C) 2001 Florian Lohoff ([email protected]) |
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* Copyright (C) 2003, 07 Ralf Baechle ([email protected]) |
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* |
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* (In all truth, Jed Schimmel wrote all this code.) |
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*/ |
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#undef DEBUG |
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#include <linux/delay.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/gfp.h> |
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#include <linux/interrupt.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/spinlock.h> |
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#include <asm/sgi/hpc3.h> |
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#include <asm/sgi/ip22.h> |
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#include <asm/sgi/wd.h> |
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#include "scsi.h" |
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#include "wd33c93.h" |
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struct ip22_hostdata { |
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struct WD33C93_hostdata wh; |
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dma_addr_t dma; |
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void *cpu; |
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struct device *dev; |
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}; |
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#define host_to_hostdata(host) ((struct ip22_hostdata *)((host)->hostdata)) |
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struct hpc_chunk { |
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struct hpc_dma_desc desc; |
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u32 _padding; /* align to quadword boundary */ |
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}; |
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/* space for hpc dma descriptors */ |
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#define HPC_DMA_SIZE PAGE_SIZE |
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#define DMA_DIR(d) ((d == DATA_OUT_DIR) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) |
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static irqreturn_t sgiwd93_intr(int irq, void *dev_id) |
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{ |
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struct Scsi_Host * host = dev_id; |
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unsigned long flags; |
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spin_lock_irqsave(host->host_lock, flags); |
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wd33c93_intr(host); |
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spin_unlock_irqrestore(host->host_lock, flags); |
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return IRQ_HANDLED; |
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} |
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static inline |
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void fill_hpc_entries(struct ip22_hostdata *hd, struct scsi_cmnd *cmd, int din) |
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{ |
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unsigned long len = cmd->SCp.this_residual; |
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void *addr = cmd->SCp.ptr; |
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dma_addr_t physaddr; |
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unsigned long count; |
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struct hpc_chunk *hcp; |
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physaddr = dma_map_single(hd->dev, addr, len, DMA_DIR(din)); |
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cmd->SCp.dma_handle = physaddr; |
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hcp = hd->cpu; |
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while (len) { |
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/* |
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* even cntinfo could be up to 16383, without |
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* magic only 8192 works correctly |
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*/ |
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count = len > 8192 ? 8192 : len; |
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hcp->desc.pbuf = physaddr; |
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hcp->desc.cntinfo = count; |
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hcp++; |
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len -= count; |
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physaddr += count; |
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} |
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/* |
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* To make sure, if we trip an HPC bug, that we transfer every single |
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* byte, we tag on an extra zero length dma descriptor at the end of |
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* the chain. |
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*/ |
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hcp->desc.pbuf = 0; |
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hcp->desc.cntinfo = HPCDMA_EOX; |
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dma_sync_single_for_device(hd->dev, hd->dma, |
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(unsigned long)(hcp + 1) - (unsigned long)hd->cpu, |
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DMA_TO_DEVICE); |
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} |
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static int dma_setup(struct scsi_cmnd *cmd, int datainp) |
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{ |
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struct ip22_hostdata *hdata = host_to_hostdata(cmd->device->host); |
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struct hpc3_scsiregs *hregs = |
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(struct hpc3_scsiregs *) cmd->device->host->base; |
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pr_debug("dma_setup: datainp<%d> hcp<%p> ", datainp, hdata->cpu); |
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hdata->wh.dma_dir = datainp; |
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/* |
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* wd33c93 shouldn't pass us bogus dma_setups, but it does:-( The |
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* other wd33c93 drivers deal with it the same way (which isn't that |
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* obvious). IMHO a better fix would be, not to do these dma setups |
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* in the first place. |
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*/ |
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if (cmd->SCp.ptr == NULL || cmd->SCp.this_residual == 0) |
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return 1; |
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fill_hpc_entries(hdata, cmd, datainp); |
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pr_debug(" HPCGO\n"); |
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/* Start up the HPC. */ |
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hregs->ndptr = hdata->dma; |
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if (datainp) |
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hregs->ctrl = HPC3_SCTRL_ACTIVE; |
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else |
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hregs->ctrl = HPC3_SCTRL_ACTIVE | HPC3_SCTRL_DIR; |
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return 0; |
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} |
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static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, |
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int status) |
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{ |
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struct ip22_hostdata *hdata = host_to_hostdata(instance); |
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struct hpc3_scsiregs *hregs; |
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if (!SCpnt) |
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return; |
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if (SCpnt->SCp.ptr == NULL || SCpnt->SCp.this_residual == 0) |
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return; |
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hregs = (struct hpc3_scsiregs *) SCpnt->device->host->base; |
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pr_debug("dma_stop: status<%d> ", status); |
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/* First stop the HPC and flush it's FIFO. */ |
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if (hdata->wh.dma_dir) { |
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hregs->ctrl |= HPC3_SCTRL_FLUSH; |
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while (hregs->ctrl & HPC3_SCTRL_ACTIVE) |
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barrier(); |
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} |
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hregs->ctrl = 0; |
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dma_unmap_single(hdata->dev, SCpnt->SCp.dma_handle, |
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SCpnt->SCp.this_residual, |
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DMA_DIR(hdata->wh.dma_dir)); |
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pr_debug("\n"); |
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} |
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void sgiwd93_reset(unsigned long base) |
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{ |
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struct hpc3_scsiregs *hregs = (struct hpc3_scsiregs *) base; |
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hregs->ctrl = HPC3_SCTRL_CRESET; |
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udelay(50); |
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hregs->ctrl = 0; |
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} |
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EXPORT_SYMBOL_GPL(sgiwd93_reset); |
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static inline void init_hpc_chain(struct ip22_hostdata *hdata) |
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{ |
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struct hpc_chunk *hcp = (struct hpc_chunk *)hdata->cpu; |
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dma_addr_t dma = hdata->dma; |
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unsigned long start, end; |
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start = (unsigned long) hcp; |
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end = start + HPC_DMA_SIZE; |
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while (start < end) { |
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hcp->desc.pnext = (u32) (dma + sizeof(struct hpc_chunk)); |
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hcp->desc.cntinfo = HPCDMA_EOX; |
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hcp++; |
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dma += sizeof(struct hpc_chunk); |
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start += sizeof(struct hpc_chunk); |
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} |
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hcp--; |
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hcp->desc.pnext = hdata->dma; |
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} |
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/* |
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* Kludge alert - the SCSI code calls the abort and reset method with int |
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* arguments not with pointers. So this is going to blow up beautyfully |
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* on 64-bit systems with memory outside the compat address spaces. |
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*/ |
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static struct scsi_host_template sgiwd93_template = { |
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.module = THIS_MODULE, |
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.proc_name = "SGIWD93", |
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.name = "SGI WD93", |
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.queuecommand = wd33c93_queuecommand, |
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.eh_abort_handler = wd33c93_abort, |
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.eh_host_reset_handler = wd33c93_host_reset, |
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.can_queue = 16, |
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.this_id = 7, |
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.sg_tablesize = SG_ALL, |
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.cmd_per_lun = 8, |
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.dma_boundary = PAGE_SIZE - 1, |
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}; |
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static int sgiwd93_probe(struct platform_device *pdev) |
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{ |
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struct sgiwd93_platform_data *pd = pdev->dev.platform_data; |
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unsigned char *wdregs = pd->wdregs; |
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struct hpc3_scsiregs *hregs = pd->hregs; |
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struct ip22_hostdata *hdata; |
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struct Scsi_Host *host; |
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wd33c93_regs regs; |
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unsigned int unit = pd->unit; |
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unsigned int irq = pd->irq; |
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int err; |
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host = scsi_host_alloc(&sgiwd93_template, sizeof(struct ip22_hostdata)); |
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if (!host) { |
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err = -ENOMEM; |
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goto out; |
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} |
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host->base = (unsigned long) hregs; |
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host->irq = irq; |
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hdata = host_to_hostdata(host); |
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hdata->dev = &pdev->dev; |
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hdata->cpu = dma_alloc_noncoherent(&pdev->dev, HPC_DMA_SIZE, |
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&hdata->dma, DMA_TO_DEVICE, GFP_KERNEL); |
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if (!hdata->cpu) { |
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printk(KERN_WARNING "sgiwd93: Could not allocate memory for " |
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"host %d buffer.\n", unit); |
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err = -ENOMEM; |
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goto out_put; |
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} |
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init_hpc_chain(hdata); |
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regs.SASR = wdregs + 3; |
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regs.SCMD = wdregs + 7; |
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hdata->wh.no_sync = 0; |
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hdata->wh.fast = 1; |
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hdata->wh.dma_mode = CTRL_BURST; |
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wd33c93_init(host, regs, dma_setup, dma_stop, WD33C93_FS_MHZ(20)); |
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err = request_irq(irq, sgiwd93_intr, 0, "SGI WD93", host); |
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if (err) { |
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printk(KERN_WARNING "sgiwd93: Could not register irq %d " |
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"for host %d.\n", irq, unit); |
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goto out_free; |
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} |
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platform_set_drvdata(pdev, host); |
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err = scsi_add_host(host, NULL); |
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if (err) |
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goto out_irq; |
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scsi_scan_host(host); |
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return 0; |
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out_irq: |
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free_irq(irq, host); |
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out_free: |
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dma_free_noncoherent(&pdev->dev, HPC_DMA_SIZE, hdata->cpu, hdata->dma, |
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DMA_TO_DEVICE); |
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out_put: |
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scsi_host_put(host); |
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out: |
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return err; |
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} |
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static int sgiwd93_remove(struct platform_device *pdev) |
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{ |
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struct Scsi_Host *host = platform_get_drvdata(pdev); |
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struct ip22_hostdata *hdata = (struct ip22_hostdata *) host->hostdata; |
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struct sgiwd93_platform_data *pd = pdev->dev.platform_data; |
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scsi_remove_host(host); |
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free_irq(pd->irq, host); |
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dma_free_noncoherent(&pdev->dev, HPC_DMA_SIZE, hdata->cpu, hdata->dma, |
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DMA_TO_DEVICE); |
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scsi_host_put(host); |
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return 0; |
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} |
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static struct platform_driver sgiwd93_driver = { |
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.probe = sgiwd93_probe, |
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.remove = sgiwd93_remove, |
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.driver = { |
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.name = "sgiwd93", |
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} |
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}; |
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static int __init sgiwd93_module_init(void) |
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{ |
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return platform_driver_register(&sgiwd93_driver); |
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} |
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static void __exit sgiwd93_module_exit(void) |
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{ |
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return platform_driver_unregister(&sgiwd93_driver); |
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} |
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module_init(sgiwd93_module_init); |
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module_exit(sgiwd93_module_exit); |
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MODULE_DESCRIPTION("SGI WD33C93 driver"); |
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MODULE_AUTHOR("Ralf Baechle <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:sgiwd93");
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