/* * 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, 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 __init 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 = __devexit_p(sgiwd93_remove), .driver = { .name = "sgiwd93", .owner = THIS_MODULE, } }; 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");