diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/sgiwd93.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/scsi/sgiwd93.c')
-rw-r--r-- | drivers/scsi/sgiwd93.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/scsi/sgiwd93.c b/drivers/scsi/sgiwd93.c new file mode 100644 index 0000000..270f2aa --- /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 (dm@engr.sgi.com) + * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu) + * Copyright (C) 2001 Florian Lohoff (flo@rfc822.org) + * Copyright (C) 2003 Ralf Baechle (ralf@linux-mips.org) + * + * (In all truth, Jed Schimmel wrote all this code.) + */ +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/blkdev.h> +#include <linux/version.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/spinlock.h> + +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/sgialib.h> +#include <asm/sgi/sgi.h> +#include <asm/sgi/mc.h> +#include <asm/sgi/hpc3.h> +#include <asm/sgi/ip22.h> +#include <asm/irq.h> +#include <asm/io.h> + +#include "scsi.h" +#include <scsi/scsi_host.h> +#include "wd33c93.h" +#include "sgiwd93.h" + +#include <linux/stat.h> + +#if 0 +#define DPRINTK(args...) printk(args) +#else +#define DPRINTK(args...) +#endif + +#define HDATA(ptr) ((struct ip22_hostdata *)((ptr)->hostdata)) + +struct ip22_hostdata { + struct WD33C93_hostdata wh; + struct hpc_data { + dma_addr_t dma; + void * cpu; + } hd; +}; + +struct hpc_chunk { + struct hpc_dma_desc desc; + u32 _padding; /* align to quadword boundary */ +}; + +struct Scsi_Host *sgiwd93_host; +struct Scsi_Host *sgiwd93_host1; + +/* Wuff wuff, wuff, wd33c93.c, wuff wuff, object oriented, bow wow. */ +static inline void write_wd33c93_count(const wd33c93_regs regs, + unsigned long value) +{ + *regs.SASR = WD_TRANSFER_COUNT_MSB; + mb(); + *regs.SCMD = ((value >> 16) & 0xff); + *regs.SCMD = ((value >> 8) & 0xff); + *regs.SCMD = ((value >> 0) & 0xff); + mb(); +} + +static inline unsigned long read_wd33c93_count(const wd33c93_regs regs) +{ + unsigned long value; + + *regs.SASR = WD_TRANSFER_COUNT_MSB; + mb(); + value = ((*regs.SCMD & 0xff) << 16); + value |= ((*regs.SCMD & 0xff) << 8); + value |= ((*regs.SCMD & 0xff) << 0); + mb(); + return value; +} + +static irqreturn_t sgiwd93_intr(int irq, void *dev_id, struct pt_regs *regs) +{ + struct Scsi_Host * host = (struct Scsi_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 hpc_chunk *hcp, Scsi_Cmnd *cmd, int datainp) +{ + unsigned long len = cmd->SCp.this_residual; + void *addr = cmd->SCp.ptr; + dma_addr_t physaddr; + unsigned long count; + + physaddr = dma_map_single(NULL, addr, len, cmd->sc_data_direction); + cmd->SCp.dma_handle = physaddr; + + 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; +} + +static int dma_setup(Scsi_Cmnd *cmd, int datainp) +{ + struct ip22_hostdata *hdata = HDATA(cmd->device->host); + struct hpc3_scsiregs *hregs = + (struct hpc3_scsiregs *) cmd->device->host->base; + struct hpc_chunk *hcp = (struct hpc_chunk *) hdata->hd.cpu; + + DPRINTK("dma_setup: datainp<%d> hcp<%p> ", datainp, hcp); + + 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(hcp, cmd, datainp); + + DPRINTK(" HPCGO\n"); + + /* Start up the HPC. */ + hregs->ndptr = hdata->hd.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, Scsi_Cmnd *SCpnt, + int status) +{ + struct ip22_hostdata *hdata = HDATA(instance); + struct hpc3_scsiregs *hregs; + + if (!SCpnt) + return; + + hregs = (struct hpc3_scsiregs *) SCpnt->device->host->base; + + DPRINTK("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(NULL, SCpnt->SCp.dma_handle, SCpnt->SCp.this_residual, + SCpnt->sc_data_direction); + + DPRINTK("\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; +} + +static inline void init_hpc_chain(struct hpc_data *hd) +{ + struct hpc_chunk *hcp = (struct hpc_chunk *) hd->cpu; + struct hpc_chunk *dma = (struct hpc_chunk *) hd->dma; + unsigned long start, end; + + start = (unsigned long) hcp; + end = start + PAGE_SIZE; + while (start < end) { + hcp->desc.pnext = (u32) (dma + 1); + hcp->desc.cntinfo = HPCDMA_EOX; + hcp++; dma++; + start += sizeof(struct hpc_chunk); + }; + hcp--; + hcp->desc.pnext = hd->dma; +} + +static struct Scsi_Host * __init sgiwd93_setup_scsi( + Scsi_Host_Template *SGIblows, int unit, int irq, + struct hpc3_scsiregs *hregs, unsigned char *wdregs) +{ + struct ip22_hostdata *hdata; + struct Scsi_Host *host; + wd33c93_regs regs; + + host = scsi_register(SGIblows, sizeof(struct ip22_hostdata)); + if (!host) + return NULL; + + host->base = (unsigned long) hregs; + host->irq = irq; + + hdata = HDATA(host); + hdata->hd.cpu = dma_alloc_coherent(NULL, PAGE_SIZE, &hdata->hd.dma, + GFP_KERNEL); + if (!hdata->hd.cpu) { + printk(KERN_WARNING "sgiwd93: Could not allocate memory for " + "host %d buffer.\n", unit); + goto out_unregister; + } + init_hpc_chain(&hdata->hd); + + regs.SASR = wdregs + 3; + regs.SCMD = wdregs + 7; + + wd33c93_init(host, regs, dma_setup, dma_stop, WD33C93_FS_16_20); + + hdata->wh.no_sync = 0; + + if (request_irq(irq, sgiwd93_intr, 0, "SGI WD93", (void *) host)) { + printk(KERN_WARNING "sgiwd93: Could not register irq %d " + "for host %d.\n", irq, unit); + goto out_free; + } + return host; + +out_free: + dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma); + wd33c93_release(); + +out_unregister: + scsi_unregister(host); + + return NULL; +} + +int __init sgiwd93_detect(Scsi_Host_Template *SGIblows) +{ + int found = 0; + + SGIblows->proc_name = "SGIWD93"; + sgiwd93_host = sgiwd93_setup_scsi(SGIblows, 0, SGI_WD93_0_IRQ, + &hpc3c0->scsi_chan0, + (unsigned char *)hpc3c0->scsi0_ext); + if (sgiwd93_host) + found++; + + /* Set up second controller on the Indigo2 */ + if (ip22_is_fullhouse()) { + sgiwd93_host1 = sgiwd93_setup_scsi(SGIblows, 1, SGI_WD93_1_IRQ, + &hpc3c0->scsi_chan1, + (unsigned char *)hpc3c0->scsi1_ext); + if (sgiwd93_host1) + found++; + } + + return found; +} + +int sgiwd93_release(struct Scsi_Host *instance) +{ + struct ip22_hostdata *hdata = HDATA(instance); + int irq = 0; + + if (sgiwd93_host && sgiwd93_host == instance) + irq = SGI_WD93_0_IRQ; + else if (sgiwd93_host1 && sgiwd93_host1 == instance) + irq = SGI_WD93_1_IRQ; + + free_irq(irq, sgiwd93_intr); + dma_free_coherent(NULL, PAGE_SIZE, hdata->hd.cpu, hdata->hd.dma); + wd33c93_release(); + + return 1; +} + +static int sgiwd93_bus_reset(Scsi_Cmnd *cmd) +{ + /* FIXME perform bus-specific reset */ + wd33c93_host_reset(cmd); + 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 Scsi_Host_Template driver_template = { + .proc_name = "SGIWD93", + .name = "SGI WD93", + .detect = sgiwd93_detect, + .release = sgiwd93_release, + .queuecommand = wd33c93_queuecommand, + .eh_abort_handler = wd33c93_abort, + .eh_bus_reset_handler = sgiwd93_bus_reset, + .eh_host_reset_handler = wd33c93_host_reset, + .can_queue = CAN_QUEUE, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = CMD_PER_LUN, + .use_clustering = DISABLE_CLUSTERING, +}; +#include "scsi_module.c" |