diff options
Diffstat (limited to 'drivers/scsi/sgiwd93.c')
| -rw-r--r-- | drivers/scsi/sgiwd93.c | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/drivers/scsi/sgiwd93.c b/drivers/scsi/sgiwd93.c new file mode 100644 index 000000000..57d5dff62 --- /dev/null +++ b/drivers/scsi/sgiwd93.c @@ -0,0 +1,332 @@ +/* + * 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/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_tcq.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) +{ + struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd); + unsigned long len = scsi_pointer->this_residual; + void *addr = scsi_pointer->ptr; + dma_addr_t physaddr; + unsigned long count; + struct hpc_chunk *hcp; + + physaddr = dma_map_single(hd->dev, addr, len, DMA_DIR(din)); + scsi_pointer->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 scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd); + 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 (scsi_pointer->ptr == NULL || scsi_pointer->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 scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(SCpnt); + struct ip22_hostdata *hdata = host_to_hostdata(instance); + struct hpc3_scsiregs *hregs; + + if (!SCpnt) + return; + + if (scsi_pointer->ptr == NULL || scsi_pointer->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, scsi_pointer->dma_handle, + scsi_pointer->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, + .cmd_size = sizeof(struct scsi_pointer), +}; + +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"); |