| /* -*- mode: c; c-basic-offset: 8 -*- */ |
| |
| /* NCR (or Symbios) 53c700 and 53c700-66 Driver |
| * |
| * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com |
| **----------------------------------------------------------------------------- |
| ** |
| ** This program is free software; you can redistribute it and/or modify |
| ** it under the terms of the GNU General Public License as published by |
| ** the Free Software Foundation; either version 2 of the License, or |
| ** (at your option) any later version. |
| ** |
| ** This program is distributed in the hope that it will be useful, |
| ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| ** GNU General Public License for more details. |
| ** |
| ** You should have received a copy of the GNU General Public License |
| ** along with this program; if not, write to the Free Software |
| ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| ** |
| **----------------------------------------------------------------------------- |
| */ |
| |
| /* Notes: |
| * |
| * This driver is designed exclusively for these chips (virtually the |
| * earliest of the scripts engine chips). They need their own drivers |
| * because they are missing so many of the scripts and snazzy register |
| * features of their elder brothers (the 710, 720 and 770). |
| * |
| * The 700 is the lowliest of the line, it can only do async SCSI. |
| * The 700-66 can at least do synchronous SCSI up to 10MHz. |
| * |
| * The 700 chip has no host bus interface logic of its own. However, |
| * it is usually mapped to a location with well defined register |
| * offsets. Therefore, if you can determine the base address and the |
| * irq your board incorporating this chip uses, you can probably use |
| * this driver to run it (although you'll probably have to write a |
| * minimal wrapper for the purpose---see the NCR_D700 driver for |
| * details about how to do this). |
| * |
| * |
| * TODO List: |
| * |
| * 1. Better statistics in the proc fs |
| * |
| * 2. Implement message queue (queues SCSI messages like commands) and make |
| * the abort and device reset functions use them. |
| * */ |
| |
| /* CHANGELOG |
| * |
| * Version 2.8 |
| * |
| * Fixed bad bug affecting tag starvation processing (previously the |
| * driver would hang the system if too many tags starved. Also fixed |
| * bad bug having to do with 10 byte command processing and REQUEST |
| * SENSE (the command would loop forever getting a transfer length |
| * mismatch in the CMD phase). |
| * |
| * Version 2.7 |
| * |
| * Fixed scripts problem which caused certain devices (notably CDRWs) |
| * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use |
| * __raw_readl/writel for parisc compatibility (Thomas |
| * Bogendoerfer). Added missing SCp->request_bufflen initialisation |
| * for sense requests (Ryan Bradetich). |
| * |
| * Version 2.6 |
| * |
| * Following test of the 64 bit parisc kernel by Richard Hirst, |
| * several problems have now been corrected. Also adds support for |
| * consistent memory allocation. |
| * |
| * Version 2.5 |
| * |
| * More Compatibility changes for 710 (now actually works). Enhanced |
| * support for odd clock speeds which constrain SDTR negotiations. |
| * correct cacheline separation for scsi messages and status for |
| * incoherent architectures. Use of the pci mapping functions on |
| * buffers to begin support for 64 bit drivers. |
| * |
| * Version 2.4 |
| * |
| * Added support for the 53c710 chip (in 53c700 emulation mode only---no |
| * special 53c710 instructions or registers are used). |
| * |
| * Version 2.3 |
| * |
| * More endianness/cache coherency changes. |
| * |
| * Better bad device handling (handles devices lying about tag |
| * queueing support and devices which fail to provide sense data on |
| * contingent allegiance conditions) |
| * |
| * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently |
| * debugging this driver on the parisc architecture and suggesting |
| * many improvements and bug fixes. |
| * |
| * Thanks also go to Linuxcare Inc. for providing several PARISC |
| * machines for me to debug the driver on. |
| * |
| * Version 2.2 |
| * |
| * Made the driver mem or io mapped; added endian invariance; added |
| * dma cache flushing operations for architectures which need it; |
| * added support for more varied clocking speeds. |
| * |
| * Version 2.1 |
| * |
| * Initial modularisation from the D700. See NCR_D700.c for the rest of |
| * the changelog. |
| * */ |
| #define NCR_700_VERSION "2.8" |
| |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/slab.h> |
| #include <linux/ioport.h> |
| #include <linux/delay.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/init.h> |
| #include <linux/proc_fs.h> |
| #include <linux/blkdev.h> |
| #include <linux/module.h> |
| #include <linux/interrupt.h> |
| #include <linux/device.h> |
| #include <asm/dma.h> |
| #include <asm/io.h> |
| #include <asm/pgtable.h> |
| #include <asm/byteorder.h> |
| |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_dbg.h> |
| #include <scsi/scsi_eh.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_tcq.h> |
| #include <scsi/scsi_transport.h> |
| #include <scsi/scsi_transport_spi.h> |
| |
| #include "53c700.h" |
| |
| /* NOTE: For 64 bit drivers there are points in the code where we use |
| * a non dereferenceable pointer to point to a structure in dma-able |
| * memory (which is 32 bits) so that we can use all of the structure |
| * operations but take the address at the end. This macro allows us |
| * to truncate the 64 bit pointer down to 32 bits without the compiler |
| * complaining */ |
| #define to32bit(x) ((__u32)((unsigned long)(x))) |
| |
| #ifdef NCR_700_DEBUG |
| #define STATIC |
| #else |
| #define STATIC static |
| #endif |
| |
| MODULE_AUTHOR("James Bottomley"); |
| MODULE_DESCRIPTION("53c700 and 53c700-66 Driver"); |
| MODULE_LICENSE("GPL"); |
| |
| /* This is the script */ |
| #include "53c700_d.h" |
| |
| |
| STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *); |
| STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt); |
| STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt); |
| STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt); |
| STATIC void NCR_700_chip_setup(struct Scsi_Host *host); |
| STATIC void NCR_700_chip_reset(struct Scsi_Host *host); |
| STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt); |
| STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt); |
| STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt); |
| static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth, int reason); |
| static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth); |
| |
| STATIC struct device_attribute *NCR_700_dev_attrs[]; |
| |
| STATIC struct scsi_transport_template *NCR_700_transport_template = NULL; |
| |
| static char *NCR_700_phase[] = { |
| "", |
| "after selection", |
| "before command phase", |
| "after command phase", |
| "after status phase", |
| "after data in phase", |
| "after data out phase", |
| "during data phase", |
| }; |
| |
| static char *NCR_700_condition[] = { |
| "", |
| "NOT MSG_OUT", |
| "UNEXPECTED PHASE", |
| "NOT MSG_IN", |
| "UNEXPECTED MSG", |
| "MSG_IN", |
| "SDTR_MSG RECEIVED", |
| "REJECT_MSG RECEIVED", |
| "DISCONNECT_MSG RECEIVED", |
| "MSG_OUT", |
| "DATA_IN", |
| |
| }; |
| |
| static char *NCR_700_fatal_messages[] = { |
| "unexpected message after reselection", |
| "still MSG_OUT after message injection", |
| "not MSG_IN after selection", |
| "Illegal message length received", |
| }; |
| |
| static char *NCR_700_SBCL_bits[] = { |
| "IO ", |
| "CD ", |
| "MSG ", |
| "ATN ", |
| "SEL ", |
| "BSY ", |
| "ACK ", |
| "REQ ", |
| }; |
| |
| static char *NCR_700_SBCL_to_phase[] = { |
| "DATA_OUT", |
| "DATA_IN", |
| "CMD_OUT", |
| "STATE", |
| "ILLEGAL PHASE", |
| "ILLEGAL PHASE", |
| "MSG OUT", |
| "MSG IN", |
| }; |
| |
| /* This translates the SDTR message offset and period to a value |
| * which can be loaded into the SXFER_REG. |
| * |
| * NOTE: According to SCSI-2, the true transfer period (in ns) is |
| * actually four times this period value */ |
| static inline __u8 |
| NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata, |
| __u8 offset, __u8 period) |
| { |
| int XFERP; |
| |
| __u8 min_xferp = (hostdata->chip710 |
| ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP); |
| __u8 max_offset = (hostdata->chip710 |
| ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET); |
| |
| if(offset == 0) |
| return 0; |
| |
| if(period < hostdata->min_period) { |
| printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4); |
| period = hostdata->min_period; |
| } |
| XFERP = (period*4 * hostdata->sync_clock)/1000 - 4; |
| if(offset > max_offset) { |
| printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n", |
| offset, max_offset); |
| offset = max_offset; |
| } |
| if(XFERP < min_xferp) { |
| XFERP = min_xferp; |
| } |
| return (offset & 0x0f) | (XFERP & 0x07)<<4; |
| } |
| |
| static inline __u8 |
| NCR_700_get_SXFER(struct scsi_device *SDp) |
| { |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; |
| |
| return NCR_700_offset_period_to_sxfer(hostdata, |
| spi_offset(SDp->sdev_target), |
| spi_period(SDp->sdev_target)); |
| } |
| |
| struct Scsi_Host * |
| NCR_700_detect(struct scsi_host_template *tpnt, |
| struct NCR_700_Host_Parameters *hostdata, struct device *dev) |
| { |
| dma_addr_t pScript, pSlots; |
| __u8 *memory; |
| __u32 *script; |
| struct Scsi_Host *host; |
| static int banner = 0; |
| int j; |
| |
| if(tpnt->sdev_attrs == NULL) |
| tpnt->sdev_attrs = NCR_700_dev_attrs; |
| |
| memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE, |
| &pScript, GFP_KERNEL); |
| if(memory == NULL) { |
| printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n"); |
| return NULL; |
| } |
| |
| script = (__u32 *)memory; |
| hostdata->msgin = memory + MSGIN_OFFSET; |
| hostdata->msgout = memory + MSGOUT_OFFSET; |
| hostdata->status = memory + STATUS_OFFSET; |
| hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET); |
| hostdata->dev = dev; |
| |
| pSlots = pScript + SLOTS_OFFSET; |
| |
| /* Fill in the missing routines from the host template */ |
| tpnt->queuecommand = NCR_700_queuecommand; |
| tpnt->eh_abort_handler = NCR_700_abort; |
| tpnt->eh_bus_reset_handler = NCR_700_bus_reset; |
| tpnt->eh_host_reset_handler = NCR_700_host_reset; |
| tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST; |
| tpnt->sg_tablesize = NCR_700_SG_SEGMENTS; |
| tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN; |
| tpnt->use_clustering = ENABLE_CLUSTERING; |
| tpnt->slave_configure = NCR_700_slave_configure; |
| tpnt->slave_destroy = NCR_700_slave_destroy; |
| tpnt->slave_alloc = NCR_700_slave_alloc; |
| tpnt->change_queue_depth = NCR_700_change_queue_depth; |
| tpnt->change_queue_type = NCR_700_change_queue_type; |
| |
| if(tpnt->name == NULL) |
| tpnt->name = "53c700"; |
| if(tpnt->proc_name == NULL) |
| tpnt->proc_name = "53c700"; |
| |
| host = scsi_host_alloc(tpnt, 4); |
| if (!host) |
| return NULL; |
| memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot) |
| * NCR_700_COMMAND_SLOTS_PER_HOST); |
| for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) { |
| dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0] |
| - (unsigned long)&hostdata->slots[0].SG[0]); |
| hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset)); |
| if(j == 0) |
| hostdata->free_list = &hostdata->slots[j]; |
| else |
| hostdata->slots[j-1].ITL_forw = &hostdata->slots[j]; |
| hostdata->slots[j].state = NCR_700_SLOT_FREE; |
| } |
| |
| for (j = 0; j < ARRAY_SIZE(SCRIPT); j++) |
| script[j] = bS_to_host(SCRIPT[j]); |
| |
| /* adjust all labels to be bus physical */ |
| for (j = 0; j < PATCHES; j++) |
| script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]); |
| /* now patch up fixed addresses. */ |
| script_patch_32(hostdata->dev, script, MessageLocation, |
| pScript + MSGOUT_OFFSET); |
| script_patch_32(hostdata->dev, script, StatusAddress, |
| pScript + STATUS_OFFSET); |
| script_patch_32(hostdata->dev, script, ReceiveMsgAddress, |
| pScript + MSGIN_OFFSET); |
| |
| hostdata->script = script; |
| hostdata->pScript = pScript; |
| dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE); |
| hostdata->state = NCR_700_HOST_FREE; |
| hostdata->cmd = NULL; |
| host->max_id = 8; |
| host->max_lun = NCR_700_MAX_LUNS; |
| BUG_ON(NCR_700_transport_template == NULL); |
| host->transportt = NCR_700_transport_template; |
| host->unique_id = (unsigned long)hostdata->base; |
| hostdata->eh_complete = NULL; |
| host->hostdata[0] = (unsigned long)hostdata; |
| /* kick the chip */ |
| NCR_700_writeb(0xff, host, CTEST9_REG); |
| if (hostdata->chip710) |
| hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f; |
| else |
| hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f; |
| hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0); |
| if (banner == 0) { |
| printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n"); |
| banner = 1; |
| } |
| printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no, |
| hostdata->chip710 ? "53c710" : |
| (hostdata->fast ? "53c700-66" : "53c700"), |
| hostdata->rev, hostdata->differential ? |
| "(Differential)" : ""); |
| /* reset the chip */ |
| NCR_700_chip_reset(host); |
| |
| if (scsi_add_host(host, dev)) { |
| dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n"); |
| scsi_host_put(host); |
| return NULL; |
| } |
| |
| spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD : |
| SPI_SIGNAL_SE; |
| |
| return host; |
| } |
| |
| int |
| NCR_700_release(struct Scsi_Host *host) |
| { |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
| |
| dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE, |
| hostdata->script, hostdata->pScript); |
| return 1; |
| } |
| |
| static inline __u8 |
| NCR_700_identify(int can_disconnect, __u8 lun) |
| { |
| return IDENTIFY_BASE | |
| ((can_disconnect) ? 0x40 : 0) | |
| (lun & NCR_700_LUN_MASK); |
| } |
| |
| /* |
| * Function : static int data_residual (Scsi_Host *host) |
| * |
| * Purpose : return residual data count of what's in the chip. If you |
| * really want to know what this function is doing, it's almost a |
| * direct transcription of the algorithm described in the 53c710 |
| * guide, except that the DBC and DFIFO registers are only 6 bits |
| * wide on a 53c700. |
| * |
| * Inputs : host - SCSI host */ |
| static inline int |
| NCR_700_data_residual (struct Scsi_Host *host) { |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
| int count, synchronous = 0; |
| unsigned int ddir; |
| |
| if(hostdata->chip710) { |
| count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) - |
| (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f; |
| } else { |
| count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) - |
| (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f; |
| } |
| |
| if(hostdata->fast) |
| synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f; |
| |
| /* get the data direction */ |
| ddir = NCR_700_readb(host, CTEST0_REG) & 0x01; |
| |
| if (ddir) { |
| /* Receive */ |
| if (synchronous) |
| count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4; |
| else |
| if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL) |
| ++count; |
| } else { |
| /* Send */ |
| __u8 sstat = NCR_700_readb(host, SSTAT1_REG); |
| if (sstat & SODL_REG_FULL) |
| ++count; |
| if (synchronous && (sstat & SODR_REG_FULL)) |
| ++count; |
| } |
| #ifdef NCR_700_DEBUG |
| if(count) |
| printk("RESIDUAL IS %d (ddir %d)\n", count, ddir); |
| #endif |
| return count; |
| } |
| |
| /* print out the SCSI wires and corresponding phase from the SBCL register |
| * in the chip */ |
| static inline char * |
| sbcl_to_string(__u8 sbcl) |
| { |
| int i; |
| static char ret[256]; |
| |
| ret[0]='\0'; |
| for(i=0; i<8; i++) { |
| if((1<<i) & sbcl) |
| strcat(ret, NCR_700_SBCL_bits[i]); |
| } |
| strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]); |
| return ret; |
| } |
| |
| static inline __u8 |
| bitmap_to_number(__u8 bitmap) |
| { |
| __u8 i; |
| |
| for(i=0; i<8 && !(bitmap &(1<<i)); i++) |
| ; |
| return i; |
| } |
| |
| /* Pull a slot off the free list */ |
| STATIC struct NCR_700_command_slot * |
| find_empty_slot(struct NCR_700_Host_Parameters *hostdata) |
| { |
| struct NCR_700_command_slot *slot = hostdata->free_list; |
| |
| if(slot == NULL) { |
| /* sanity check */ |
| if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST) |
| printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST); |
| return NULL; |
| } |
| |
| if(slot->state != NCR_700_SLOT_FREE) |
| /* should panic! */ |
| printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n"); |
| |
| |
| hostdata->free_list = slot->ITL_forw; |
| slot->ITL_forw = NULL; |
| |
| |
| /* NOTE: set the state to busy here, not queued, since this |
| * indicates the slot is in use and cannot be run by the IRQ |
| * finish routine. If we cannot queue the command when it |
| * is properly build, we then change to NCR_700_SLOT_QUEUED */ |
| slot->state = NCR_700_SLOT_BUSY; |
| slot->flags = 0; |
| hostdata->command_slot_count++; |
| |
| return slot; |
| } |
| |
| STATIC void |
| free_slot(struct NCR_700_command_slot *slot, |
| struct NCR_700_Host_Parameters *hostdata) |
| { |
| if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) { |
| printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot); |
| } |
| if(slot->state == NCR_700_SLOT_FREE) { |
| printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot); |
| } |
| |
| slot->resume_offset = 0; |
| slot->cmnd = NULL; |
| slot->state = NCR_700_SLOT_FREE; |
| slot->ITL_forw = hostdata->free_list; |
| hostdata->free_list = slot; |
| hostdata->command_slot_count--; |
| } |
| |
| |
| /* This routine really does very little. The command is indexed on |
| the ITL and (if tagged) the ITLQ lists in _queuecommand */ |
| STATIC void |
| save_for_reselection(struct NCR_700_Host_Parameters *hostdata, |
| struct scsi_cmnd *SCp, __u32 dsp) |
| { |
| /* Its just possible that this gets executed twice */ |
| if(SCp != NULL) { |
| struct NCR_700_command_slot *slot = |
| (struct NCR_700_command_slot *)SCp->host_scribble; |
| |
| slot->resume_offset = dsp; |
| } |
| hostdata->state = NCR_700_HOST_FREE; |
| hostdata->cmd = NULL; |
| } |
| |
| STATIC inline void |
| NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp, |
| struct NCR_700_command_slot *slot) |
| { |
| if(SCp->sc_data_direction != DMA_NONE && |
| SCp->sc_data_direction != DMA_BIDIRECTIONAL) |
| scsi_dma_unmap(SCp); |
| } |
| |
| STATIC inline void |
| NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata, |
| struct scsi_cmnd *SCp, int result) |
| { |
| hostdata->state = NCR_700_HOST_FREE; |
| hostdata->cmd = NULL; |
| |
| if(SCp != NULL) { |
| struct NCR_700_command_slot *slot = |
| (struct NCR_700_command_slot *)SCp->host_scribble; |
| |
| dma_unmap_single(hostdata->dev, slot->pCmd, |
| MAX_COMMAND_SIZE, DMA_TO_DEVICE); |
| if (slot->flags == NCR_700_FLAG_AUTOSENSE) { |
| char *cmnd = NCR_700_get_sense_cmnd(SCp->device); |
| |
| dma_unmap_single(hostdata->dev, slot->dma_handle, |
| SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); |
| /* restore the old result if the request sense was |
| * successful */ |
| if (result == 0) |
| result = cmnd[7]; |
| /* restore the original length */ |
| SCp->cmd_len = cmnd[8]; |
| } else |
| NCR_700_unmap(hostdata, SCp, slot); |
| |
| free_slot(slot, hostdata); |
| #ifdef NCR_700_DEBUG |
| if(NCR_700_get_depth(SCp->device) == 0 || |
| NCR_700_get_depth(SCp->device) > SCp->device->queue_depth) |
| printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n", |
| NCR_700_get_depth(SCp->device)); |
| #endif /* NCR_700_DEBUG */ |
| NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1); |
| |
| SCp->host_scribble = NULL; |
| SCp->result = result; |
| SCp->scsi_done(SCp); |
| } else { |
| printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n"); |
| } |
| } |
| |
| |
| STATIC void |
| NCR_700_internal_bus_reset(struct Scsi_Host *host) |
| { |
| /* Bus reset */ |
| NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG); |
| udelay(50); |
| NCR_700_writeb(0, host, SCNTL1_REG); |
| |
| } |
| |
| STATIC void |
| NCR_700_chip_setup(struct Scsi_Host *host) |
| { |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
| __u8 min_period; |
| __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP); |
| |
| if(hostdata->chip710) { |
| __u8 burst_disable = 0; |
| __u8 burst_length = 0; |
| |
| switch (hostdata->burst_length) { |
| case 1: |
| burst_length = BURST_LENGTH_1; |
| break; |
| case 2: |
| burst_length = BURST_LENGTH_2; |
| break; |
| case 4: |
| burst_length = BURST_LENGTH_4; |
| break; |
| case 8: |
| burst_length = BURST_LENGTH_8; |
| break; |
| default: |
| burst_disable = BURST_DISABLE; |
| break; |
| } |
| hostdata->dcntl_extra |= COMPAT_700_MODE; |
| |
| NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG); |
| NCR_700_writeb(burst_length | hostdata->dmode_extra, |
| host, DMODE_710_REG); |
| NCR_700_writeb(burst_disable | hostdata->ctest7_extra | |
| (hostdata->differential ? DIFF : 0), |
| host, CTEST7_REG); |
| NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG); |
| NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY |
| | AUTO_ATN, host, SCNTL0_REG); |
| } else { |
| NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra, |
| host, DMODE_700_REG); |
| NCR_700_writeb(hostdata->differential ? |
| DIFF : 0, host, CTEST7_REG); |
| if(hostdata->fast) { |
| /* this is for 700-66, does nothing on 700 */ |
| NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION |
| | GENERATE_RECEIVE_PARITY, host, |
| CTEST8_REG); |
| } else { |
| NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY |
| | PARITY | AUTO_ATN, host, SCNTL0_REG); |
| } |
| } |
| |
| NCR_700_writeb(1 << host->this_id, host, SCID_REG); |
| NCR_700_writeb(0, host, SBCL_REG); |
| NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG); |
| |
| NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT |
| | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG); |
| |
| NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG); |
| NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG); |
| if(hostdata->clock > 75) { |
| printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock); |
| /* do the best we can, but the async clock will be out |
| * of spec: sync divider 2, async divider 3 */ |
| DEBUG(("53c700: sync 2 async 3\n")); |
| NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG); |
| NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG); |
| hostdata->sync_clock = hostdata->clock/2; |
| } else if(hostdata->clock > 50 && hostdata->clock <= 75) { |
| /* sync divider 1.5, async divider 3 */ |
| DEBUG(("53c700: sync 1.5 async 3\n")); |
| NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG); |
| NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG); |
| hostdata->sync_clock = hostdata->clock*2; |
| hostdata->sync_clock /= 3; |
| |
| } else if(hostdata->clock > 37 && hostdata->clock <= 50) { |
| /* sync divider 1, async divider 2 */ |
| DEBUG(("53c700: sync 1 async 2\n")); |
| NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); |
| NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG); |
| hostdata->sync_clock = hostdata->clock; |
| } else if(hostdata->clock > 25 && hostdata->clock <=37) { |
| /* sync divider 1, async divider 1.5 */ |
| DEBUG(("53c700: sync 1 async 1.5\n")); |
| NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); |
| NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG); |
| hostdata->sync_clock = hostdata->clock; |
| } else { |
| DEBUG(("53c700: sync 1 async 1\n")); |
| NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); |
| NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG); |
| /* sync divider 1, async divider 1 */ |
| hostdata->sync_clock = hostdata->clock; |
| } |
| /* Calculate the actual minimum period that can be supported |
| * by our synchronous clock speed. See the 710 manual for |
| * exact details of this calculation which is based on a |
| * setting of the SXFER register */ |
| min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock); |
| hostdata->min_period = NCR_700_MIN_PERIOD; |
| if(min_period > NCR_700_MIN_PERIOD) |
| hostdata->min_period = min_period; |
| } |
| |
| STATIC void |
| NCR_700_chip_reset(struct Scsi_Host *host) |
| { |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
| if(hostdata->chip710) { |
| NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG); |
| udelay(100); |
| |
| NCR_700_writeb(0, host, ISTAT_REG); |
| } else { |
| NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG); |
| udelay(100); |
| |
| NCR_700_writeb(0, host, DCNTL_REG); |
| } |
| |
| mdelay(1000); |
| |
| NCR_700_chip_setup(host); |
| } |
| |
| /* The heart of the message processing engine is that the instruction |
| * immediately after the INT is the normal case (and so must be CLEAR |
| * ACK). If we want to do something else, we call that routine in |
| * scripts and set temp to be the normal case + 8 (skipping the CLEAR |
| * ACK) so that the routine returns correctly to resume its activity |
| * */ |
| STATIC __u32 |
| process_extended_message(struct Scsi_Host *host, |
| struct NCR_700_Host_Parameters *hostdata, |
| struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps) |
| { |
| __u32 resume_offset = dsp, temp = dsp + 8; |
| __u8 pun = 0xff, lun = 0xff; |
| |
| if(SCp != NULL) { |
| pun = SCp->device->id; |
| lun = SCp->device->lun; |
| } |
| |
| switch(hostdata->msgin[2]) { |
| case A_SDTR_MSG: |
| if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) { |
| struct scsi_target *starget = SCp->device->sdev_target; |
| __u8 period = hostdata->msgin[3]; |
| __u8 offset = hostdata->msgin[4]; |
| |
| if(offset == 0 || period == 0) { |
| offset = 0; |
| period = 0; |
| } |
| |
| spi_offset(starget) = offset; |
| spi_period(starget) = period; |
| |
| if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) { |
| spi_display_xfer_agreement(starget); |
| NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION); |
| } |
| |
| NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); |
| NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
| |
| NCR_700_writeb(NCR_700_get_SXFER(SCp->device), |
| host, SXFER_REG); |
| |
| } else { |
| /* SDTR message out of the blue, reject it */ |
| shost_printk(KERN_WARNING, host, |
| "Unexpected SDTR msg\n"); |
| hostdata->msgout[0] = A_REJECT_MSG; |
| dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE); |
| script_patch_16(hostdata->dev, hostdata->script, |
| MessageCount, 1); |
| /* SendMsgOut returns, so set up the return |
| * address */ |
| resume_offset = hostdata->pScript + Ent_SendMessageWithATN; |
| } |
| break; |
| |
| case A_WDTR_MSG: |
| printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n", |
| host->host_no, pun, lun); |
| hostdata->msgout[0] = A_REJECT_MSG; |
| dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE); |
| script_patch_16(hostdata->dev, hostdata->script, MessageCount, |
| 1); |
| resume_offset = hostdata->pScript + Ent_SendMessageWithATN; |
| |
| break; |
| |
| default: |
| printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ", |
| host->host_no, pun, lun, |
| NCR_700_phase[(dsps & 0xf00) >> 8]); |
| spi_print_msg(hostdata->msgin); |
| printk("\n"); |
| /* just reject it */ |
| hostdata->msgout[0] = A_REJECT_MSG; |
| dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE); |
| script_patch_16(hostdata->dev, hostdata->script, MessageCount, |
| 1); |
| /* SendMsgOut returns, so set up the return |
| * address */ |
| resume_offset = hostdata->pScript + Ent_SendMessageWithATN; |
| } |
| NCR_700_writel(temp, host, TEMP_REG); |
| return resume_offset; |
| } |
| |
| STATIC __u32 |
| process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata, |
| struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps) |
| { |
| /* work out where to return to */ |
| __u32 temp = dsp + 8, resume_offset = dsp; |
| __u8 pun = 0xff, lun = 0xff; |
| |
| if(SCp != NULL) { |
| pun = SCp->device->id; |
| lun = SCp->device->lun; |
| } |
| |
| #ifdef NCR_700_DEBUG |
| printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun, |
| NCR_700_phase[(dsps & 0xf00) >> 8]); |
| spi_print_msg(hostdata->msgin); |
| printk("\n"); |
| #endif |
| |
| switch(hostdata->msgin[0]) { |
| |
| case A_EXTENDED_MSG: |
| resume_offset = process_extended_message(host, hostdata, SCp, |
| dsp, dsps); |
| break; |
| |
| case A_REJECT_MSG: |
| if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) { |
| /* Rejected our sync negotiation attempt */ |
| spi_period(SCp->device->sdev_target) = |
| spi_offset(SCp->device->sdev_target) = 0; |
| NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); |
| NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
| } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) { |
| /* rejected our first simple tag message */ |
| scmd_printk(KERN_WARNING, SCp, |
| "Rejected first tag queue attempt, turning off tag queueing\n"); |
| /* we're done negotiating */ |
| NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION); |
| hostdata->tag_negotiated &= ~(1<<scmd_id(SCp)); |
| SCp->device->tagged_supported = 0; |
| scsi_deactivate_tcq(SCp->device, host->cmd_per_lun); |
| } else { |
| shost_printk(KERN_WARNING, host, |
| "(%d:%d) Unexpected REJECT Message %s\n", |
| pun, lun, |
| NCR_700_phase[(dsps & 0xf00) >> 8]); |
| /* however, just ignore it */ |
| } |
| break; |
| |
| case A_PARITY_ERROR_MSG: |
| printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no, |
| pun, lun); |
| NCR_700_internal_bus_reset(host); |
| break; |
| case A_SIMPLE_TAG_MSG: |
| printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no, |
| pun, lun, hostdata->msgin[1], |
| NCR_700_phase[(dsps & 0xf00) >> 8]); |
| /* just ignore it */ |
| break; |
| default: |
| printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ", |
| host->host_no, pun, lun, |
| NCR_700_phase[(dsps & 0xf00) >> 8]); |
| |
| spi_print_msg(hostdata->msgin); |
| printk("\n"); |
| /* just reject it */ |
| hostdata->msgout[0] = A_REJECT_MSG; |
| dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE); |
| script_patch_16(hostdata->dev, hostdata->script, MessageCount, |
| 1); |
| /* SendMsgOut returns, so set up the return |
| * address */ |
| resume_offset = hostdata->pScript + Ent_SendMessageWithATN; |
| |
| break; |
| } |
| NCR_700_writel(temp, host, TEMP_REG); |
| /* set us up to receive another message */ |
| dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE); |
| return resume_offset; |
| } |
| |
| STATIC __u32 |
| process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp, |
| struct Scsi_Host *host, |
| struct NCR_700_Host_Parameters *hostdata) |
| { |
| __u32 resume_offset = 0; |
| __u8 pun = 0xff, lun=0xff; |
| |
| if(SCp != NULL) { |
| pun = SCp->device->id; |
| lun = SCp->device->lun; |
| } |
| |
| if(dsps == A_GOOD_STATUS_AFTER_STATUS) { |
| DEBUG((" COMMAND COMPLETE, status=%02x\n", |
| hostdata->status[0])); |
| /* OK, if TCQ still under negotiation, we now know it works */ |
| if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) |
| NCR_700_set_tag_neg_state(SCp->device, |
| NCR_700_FINISHED_TAG_NEGOTIATION); |
| |
| /* check for contingent allegiance contitions */ |
| if(status_byte(hostdata->status[0]) == CHECK_CONDITION || |
| status_byte(hostdata->status[0]) == COMMAND_TERMINATED) { |
| struct NCR_700_command_slot *slot = |
| (struct NCR_700_command_slot *)SCp->host_scribble; |
| if(slot->flags == NCR_700_FLAG_AUTOSENSE) { |
| /* OOPS: bad device, returning another |
| * contingent allegiance condition */ |
| scmd_printk(KERN_ERR, SCp, |
| "broken device is looping in contingent allegiance: ignoring\n"); |
| NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); |
| } else { |
| char *cmnd = |
| NCR_700_get_sense_cmnd(SCp->device); |
| #ifdef NCR_DEBUG |
| scsi_print_command(SCp); |
| printk(" cmd %p has status %d, requesting sense\n", |
| SCp, hostdata->status[0]); |
| #endif |
| /* we can destroy the command here |
| * because the contingent allegiance |
| * condition will cause a retry which |
| * will re-copy the command from the |
| * saved data_cmnd. We also unmap any |
| * data associated with the command |
| * here */ |
| NCR_700_unmap(hostdata, SCp, slot); |
| dma_unmap_single(hostdata->dev, slot->pCmd, |
| MAX_COMMAND_SIZE, |
| DMA_TO_DEVICE); |
| |
| cmnd[0] = REQUEST_SENSE; |
| cmnd[1] = (lun & 0x7) << 5; |
| cmnd[2] = 0; |
| cmnd[3] = 0; |
| cmnd[4] = SCSI_SENSE_BUFFERSIZE; |
| cmnd[5] = 0; |
| /* Here's a quiet hack: the |
| * REQUEST_SENSE command is six bytes, |
| * so store a flag indicating that |
| * this was an internal sense request |
| * and the original status at the end |
| * of the command */ |
| cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC; |
| cmnd[7] = hostdata->status[0]; |
| cmnd[8] = SCp->cmd_len; |
| SCp->cmd_len = 6; /* command length for |
| * REQUEST_SENSE */ |
| slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE); |
| slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); |
| slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE); |
| slot->SG[0].pAddr = bS_to_host(slot->dma_handle); |
| slot->SG[1].ins = bS_to_host(SCRIPT_RETURN); |
| slot->SG[1].pAddr = 0; |
| slot->resume_offset = hostdata->pScript; |
| dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE); |
| dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); |
| |
| /* queue the command for reissue */ |
| slot->state = NCR_700_SLOT_QUEUED; |
| slot->flags = NCR_700_FLAG_AUTOSENSE; |
| hostdata->state = NCR_700_HOST_FREE; |
| hostdata->cmd = NULL; |
| } |
| } else { |
| // Currently rely on the mid layer evaluation |
| // of the tag queuing capability |
| // |
| //if(status_byte(hostdata->status[0]) == GOOD && |
| // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) { |
| // /* Piggy back the tag queueing support |
| // * on this command */ |
| // dma_sync_single_for_cpu(hostdata->dev, |
| // slot->dma_handle, |
| // SCp->request_bufflen, |
| // DMA_FROM_DEVICE); |
| // if(((char *)SCp->request_buffer)[7] & 0x02) { |
| // scmd_printk(KERN_INFO, SCp, |
| // "Enabling Tag Command Queuing\n"); |
| // hostdata->tag_negotiated |= (1<<scmd_id(SCp)); |
| // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING); |
| // } else { |
| // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING); |
| // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp)); |
| // } |
| //} |
| NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); |
| } |
| } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) { |
| __u8 i = (dsps & 0xf00) >> 8; |
| |
| scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n", |
| NCR_700_phase[i], |
| sbcl_to_string(NCR_700_readb(host, SBCL_REG))); |
| scmd_printk(KERN_ERR, SCp, " len = %d, cmd =", |
| SCp->cmd_len); |
| scsi_print_command(SCp); |
| |
| NCR_700_internal_bus_reset(host); |
| } else if((dsps & 0xfffff000) == A_FATAL) { |
| int i = (dsps & 0xfff); |
| |
| printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n", |
| host->host_no, pun, lun, NCR_700_fatal_messages[i]); |
| if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) { |
| printk(KERN_ERR " msg begins %02x %02x\n", |
| hostdata->msgin[0], hostdata->msgin[1]); |
| } |
| NCR_700_internal_bus_reset(host); |
| } else if((dsps & 0xfffff0f0) == A_DISCONNECT) { |
| #ifdef NCR_700_DEBUG |
| __u8 i = (dsps & 0xf00) >> 8; |
| |
| printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n", |
| host->host_no, pun, lun, |
| i, NCR_700_phase[i]); |
| #endif |
| save_for_reselection(hostdata, SCp, dsp); |
| |
| } else if(dsps == A_RESELECTION_IDENTIFIED) { |
| __u8 lun; |
| struct NCR_700_command_slot *slot; |
| __u8 reselection_id = hostdata->reselection_id; |
| struct scsi_device *SDp; |
| |
| lun = hostdata->msgin[0] & 0x1f; |
| |
| hostdata->reselection_id = 0xff; |
| DEBUG(("scsi%d: (%d:%d) RESELECTED!\n", |
| host->host_no, reselection_id, lun)); |
| /* clear the reselection indicator */ |
| SDp = __scsi_device_lookup(host, 0, reselection_id, lun); |
| if(unlikely(SDp == NULL)) { |
| printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n", |
| host->host_no, reselection_id, lun); |
| BUG(); |
| } |
| if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) { |
| struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]); |
| if(unlikely(SCp == NULL)) { |
| printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", |
| host->host_no, reselection_id, lun, hostdata->msgin[2]); |
| BUG(); |
| } |
| |
| slot = (struct NCR_700_command_slot *)SCp->host_scribble; |
| DDEBUG(KERN_DEBUG, SDp, |
| "reselection is tag %d, slot %p(%d)\n", |
| hostdata->msgin[2], slot, slot->tag); |
| } else { |
| struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG); |
| if(unlikely(SCp == NULL)) { |
| sdev_printk(KERN_ERR, SDp, |
| "no saved request for untagged cmd\n"); |
| BUG(); |
| } |
| slot = (struct NCR_700_command_slot *)SCp->host_scribble; |
| } |
| |
| if(slot == NULL) { |
| printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n", |
| host->host_no, reselection_id, lun, |
| hostdata->msgin[0], hostdata->msgin[1], |
| hostdata->msgin[2]); |
| } else { |
| if(hostdata->state != NCR_700_HOST_BUSY) |
| printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n", |
| host->host_no); |
| resume_offset = slot->resume_offset; |
| hostdata->cmd = slot->cmnd; |
| |
| /* re-patch for this command */ |
| script_patch_32_abs(hostdata->dev, hostdata->script, |
| CommandAddress, slot->pCmd); |
| script_patch_16(hostdata->dev, hostdata->script, |
| CommandCount, slot->cmnd->cmd_len); |
| script_patch_32_abs(hostdata->dev, hostdata->script, |
| SGScriptStartAddress, |
| to32bit(&slot->pSG[0].ins)); |
| |
| /* Note: setting SXFER only works if we're |
| * still in the MESSAGE phase, so it is vital |
| * that ACK is still asserted when we process |
| * the reselection message. The resume offset |
| * should therefore always clear ACK */ |
| NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device), |
| host, SXFER_REG); |
| dma_cache_sync(hostdata->dev, hostdata->msgin, |
| MSG_ARRAY_SIZE, DMA_FROM_DEVICE); |
| dma_cache_sync(hostdata->dev, hostdata->msgout, |
| MSG_ARRAY_SIZE, DMA_TO_DEVICE); |
| /* I'm just being paranoid here, the command should |
| * already have been flushed from the cache */ |
| dma_cache_sync(hostdata->dev, slot->cmnd->cmnd, |
| slot->cmnd->cmd_len, DMA_TO_DEVICE); |
| |
| |
| |
| } |
| } else if(dsps == A_RESELECTED_DURING_SELECTION) { |
| |
| /* This section is full of debugging code because I've |
| * never managed to reach it. I think what happens is |
| * that, because the 700 runs with selection |
| * interrupts enabled the whole time that we take a |
| * selection interrupt before we manage to get to the |
| * reselected script interrupt */ |
| |
| __u8 reselection_id = NCR_700_readb(host, SFBR_REG); |
| struct NCR_700_command_slot *slot; |
| |
| /* Take out our own ID */ |
| reselection_id &= ~(1<<host->this_id); |
| |
| /* I've never seen this happen, so keep this as a printk rather |
| * than a debug */ |
| printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n", |
| host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count); |
| |
| { |
| /* FIXME: DEBUGGING CODE */ |
| __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]); |
| int i; |
| |
| for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) { |
| if(SG >= to32bit(&hostdata->slots[i].pSG[0]) |
| && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS])) |
| break; |
| } |
| printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset); |
| SCp = hostdata->slots[i].cmnd; |
| } |
| |
| if(SCp != NULL) { |
| slot = (struct NCR_700_command_slot *)SCp->host_scribble; |
| /* change slot from busy to queued to redo command */ |
| slot->state = NCR_700_SLOT_QUEUED; |
| } |
| hostdata->cmd = NULL; |
| |
| if(reselection_id == 0) { |
| if(hostdata->reselection_id == 0xff) { |
| printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no); |
| return 0; |
| } else { |
| printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n", |
| host->host_no); |
| reselection_id = hostdata->reselection_id; |
| } |
| } else { |
| |
| /* convert to real ID */ |
| reselection_id = bitmap_to_number(reselection_id); |
| } |
| hostdata->reselection_id = reselection_id; |
| /* just in case we have a stale simple tag message, clear it */ |
| hostdata->msgin[1] = 0; |
| dma_cache_sync(hostdata->dev, hostdata->msgin, |
| MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL); |
| if(hostdata->tag_negotiated & (1<<reselection_id)) { |
| resume_offset = hostdata->pScript + Ent_GetReselectionWithTag; |
| } else { |
| resume_offset = hostdata->pScript + Ent_GetReselectionData; |
| } |
| } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) { |
| /* we've just disconnected from the bus, do nothing since |
| * a return here will re-run the queued command slot |
| * that may have been interrupted by the initial selection */ |
| DEBUG((" SELECTION COMPLETED\n")); |
| } else if((dsps & 0xfffff0f0) == A_MSG_IN) { |
| resume_offset = process_message(host, hostdata, SCp, |
| dsp, dsps); |
| } else if((dsps & 0xfffff000) == 0) { |
| __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8; |
| printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n", |
| host->host_no, pun, lun, NCR_700_condition[i], |
| NCR_700_phase[j], dsp - hostdata->pScript); |
| if(SCp != NULL) { |
| struct scatterlist *sg; |
| |
| scsi_print_command(SCp); |
| scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) { |
| printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr); |
| } |
| } |
| NCR_700_internal_bus_reset(host); |
| } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) { |
| printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n", |
| host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript); |
| resume_offset = dsp; |
| } else { |
| printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n", |
| host->host_no, pun, lun, dsps, dsp - hostdata->pScript); |
| NCR_700_internal_bus_reset(host); |
| } |
| return resume_offset; |
| } |
| |
| /* We run the 53c700 with selection interrupts always enabled. This |
| * means that the chip may be selected as soon as the bus frees. On a |
| * busy bus, this can be before the scripts engine finishes its |
| * processing. Therefore, part of the selection processing has to be |
| * to find out what the scripts engine is doing and complete the |
| * function if necessary (i.e. process the pending disconnect or save |
| * the interrupted initial selection */ |
| STATIC inline __u32 |
| process_selection(struct Scsi_Host *host, __u32 dsp) |
| { |
| __u8 id = 0; /* Squash compiler warning */ |
| int count = 0; |
| __u32 resume_offset = 0; |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
| struct scsi_cmnd *SCp = hostdata->cmd; |
| __u8 sbcl; |
| |
| for(count = 0; count < 5; count++) { |
| id = NCR_700_readb(host, hostdata->chip710 ? |
| CTEST9_REG : SFBR_REG); |
| |
| /* Take out our own ID */ |
| id &= ~(1<<host->this_id); |
| if(id != 0) |
| break; |
| udelay(5); |
| } |
| sbcl = NCR_700_readb(host, SBCL_REG); |
| if((sbcl & SBCL_IO) == 0) { |
| /* mark as having been selected rather than reselected */ |
| id = 0xff; |
| } else { |
| /* convert to real ID */ |
| hostdata->reselection_id = id = bitmap_to_number(id); |
| DEBUG(("scsi%d: Reselected by %d\n", |
| host->host_no, id)); |
| } |
| if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) { |
| struct NCR_700_command_slot *slot = |
| (struct NCR_700_command_slot *)SCp->host_scribble; |
| DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset)); |
| |
| switch(dsp - hostdata->pScript) { |
| case Ent_Disconnect1: |
| case Ent_Disconnect2: |
| save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript); |
| break; |
| case Ent_Disconnect3: |
| case Ent_Disconnect4: |
| save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript); |
| break; |
| case Ent_Disconnect5: |
| case Ent_Disconnect6: |
| save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript); |
| break; |
| case Ent_Disconnect7: |
| case Ent_Disconnect8: |
| save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript); |
| break; |
| case Ent_Finish1: |
| case Ent_Finish2: |
| process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata); |
| break; |
| |
| default: |
| slot->state = NCR_700_SLOT_QUEUED; |
| break; |
| } |
| } |
| hostdata->state = NCR_700_HOST_BUSY; |
| hostdata->cmd = NULL; |
| /* clear any stale simple tag message */ |
| hostdata->msgin[1] = 0; |
| dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, |
| DMA_BIDIRECTIONAL); |
| |
| if(id == 0xff) { |
| /* Selected as target, Ignore */ |
| resume_offset = hostdata->pScript + Ent_SelectedAsTarget; |
| } else if(hostdata->tag_negotiated & (1<<id)) { |
| resume_offset = hostdata->pScript + Ent_GetReselectionWithTag; |
| } else { |
| resume_offset = hostdata->pScript + Ent_GetReselectionData; |
| } |
| return resume_offset; |
| } |
| |
| static inline void |
| NCR_700_clear_fifo(struct Scsi_Host *host) { |
| const struct NCR_700_Host_Parameters *hostdata |
| = (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
| if(hostdata->chip710) { |
| NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG); |
| } else { |
| NCR_700_writeb(CLR_FIFO, host, DFIFO_REG); |
| } |
| } |
| |
| static inline void |
| NCR_700_flush_fifo(struct Scsi_Host *host) { |
| const struct NCR_700_Host_Parameters *hostdata |
| = (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
| if(hostdata->chip710) { |
| NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG); |
| udelay(10); |
| NCR_700_writeb(0, host, CTEST8_REG); |
| } else { |
| NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG); |
| udelay(10); |
| NCR_700_writeb(0, host, DFIFO_REG); |
| } |
| } |
| |
| |
| /* The queue lock with interrupts disabled must be held on entry to |
| * this function */ |
| STATIC int |
| NCR_700_start_command(struct scsi_cmnd *SCp) |
| { |
| struct NCR_700_command_slot *slot = |
| (struct NCR_700_command_slot *)SCp->host_scribble; |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; |
| __u16 count = 1; /* for IDENTIFY message */ |
| u8 lun = SCp->device->lun; |
| |
| if(hostdata->state != NCR_700_HOST_FREE) { |
| /* keep this inside the lock to close the race window where |
| * the running command finishes on another CPU while we don't |
| * change the state to queued on this one */ |
| slot->state = NCR_700_SLOT_QUEUED; |
| |
| DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n", |
| SCp->device->host->host_no, slot->cmnd, slot)); |
| return 0; |
| } |
| hostdata->state = NCR_700_HOST_BUSY; |
| hostdata->cmd = SCp; |
| slot->state = NCR_700_SLOT_BUSY; |
| /* keep interrupts disabled until we have the command correctly |
| * set up so we cannot take a selection interrupt */ |
| |
| hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE && |
| slot->flags != NCR_700_FLAG_AUTOSENSE), |
| lun); |
| /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure |
| * if the negotiated transfer parameters still hold, so |
| * always renegotiate them */ |
| if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE || |
| slot->flags == NCR_700_FLAG_AUTOSENSE) { |
| NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); |
| } |
| |
| /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status. |
| * If a contingent allegiance condition exists, the device |
| * will refuse all tags, so send the request sense as untagged |
| * */ |
| if((hostdata->tag_negotiated & (1<<scmd_id(SCp))) |
| && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE && |
| slot->flags != NCR_700_FLAG_AUTOSENSE)) { |
| count += spi_populate_tag_msg(&hostdata->msgout[count], SCp); |
| } |
| |
| if(hostdata->fast && |
| NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) { |
| count += spi_populate_sync_msg(&hostdata->msgout[count], |
| spi_period(SCp->device->sdev_target), |
| spi_offset(SCp->device->sdev_target)); |
| NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
| } |
| |
| script_patch_16(hostdata->dev, hostdata->script, MessageCount, count); |
| |
| |
| script_patch_ID(hostdata->dev, hostdata->script, |
| Device_ID, 1<<scmd_id(SCp)); |
| |
| script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress, |
| slot->pCmd); |
| script_patch_16(hostdata->dev, hostdata->script, CommandCount, |
| SCp->cmd_len); |
| /* finally plumb the beginning of the SG list into the script |
| * */ |
| script_patch_32_abs(hostdata->dev, hostdata->script, |
| SGScriptStartAddress, to32bit(&slot->pSG[0].ins)); |
| NCR_700_clear_fifo(SCp->device->host); |
| |
| if(slot->resume_offset == 0) |
| slot->resume_offset = hostdata->pScript; |
| /* now perform all the writebacks and invalidates */ |
| dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE); |
| dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, |
| DMA_FROM_DEVICE); |
| dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE); |
| dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE); |
| |
| /* set the synchronous period/offset */ |
| NCR_700_writeb(NCR_700_get_SXFER(SCp->device), |
| SCp->device->host, SXFER_REG); |
| NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG); |
| NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG); |
| |
| return 1; |
| } |
| |
| irqreturn_t |
| NCR_700_intr(int irq, void *dev_id) |
| { |
| struct Scsi_Host *host = (struct Scsi_Host *)dev_id; |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
| __u8 istat; |
| __u32 resume_offset = 0; |
| __u8 pun = 0xff, lun = 0xff; |
| unsigned long flags; |
| int handled = 0; |
| |
| /* Use the host lock to serialise access to the 53c700 |
| * hardware. Note: In future, we may need to take the queue |
| * lock to enter the done routines. When that happens, we |
| * need to ensure that for this driver, the host lock and the |
| * queue lock point to the same thing. */ |
| spin_lock_irqsave(host->host_lock, flags); |
| if((istat = NCR_700_readb(host, ISTAT_REG)) |
| & (SCSI_INT_PENDING | DMA_INT_PENDING)) { |
| __u32 dsps; |
| __u8 sstat0 = 0, dstat = 0; |
| __u32 dsp; |
| struct scsi_cmnd *SCp = hostdata->cmd; |
| enum NCR_700_Host_State state; |
| |
| handled = 1; |
| state = hostdata->state; |
| SCp = hostdata->cmd; |
| |
| if(istat & SCSI_INT_PENDING) { |
| udelay(10); |
| |
| sstat0 = NCR_700_readb(host, SSTAT0_REG); |
| } |
| |
| if(istat & DMA_INT_PENDING) { |
| udelay(10); |
| |
| dstat = NCR_700_readb(host, DSTAT_REG); |
| } |
| |
| dsps = NCR_700_readl(host, DSPS_REG); |
| dsp = NCR_700_readl(host, DSP_REG); |
| |
| DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n", |
| host->host_no, istat, sstat0, dstat, |
| (dsp - (__u32)(hostdata->pScript))/4, |
| dsp, dsps)); |
| |
| if(SCp != NULL) { |
| pun = SCp->device->id; |
| lun = SCp->device->lun; |
| } |
| |
| if(sstat0 & SCSI_RESET_DETECTED) { |
| struct scsi_device *SDp; |
| int i; |
| |
| hostdata->state = NCR_700_HOST_BUSY; |
| |
| printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n", |
| host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript); |
| |
| scsi_report_bus_reset(host, 0); |
| |
| /* clear all the negotiated parameters */ |
| __shost_for_each_device(SDp, host) |
| NCR_700_clear_flag(SDp, ~0); |
| |
| /* clear all the slots and their pending commands */ |
| for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) { |
| struct scsi_cmnd *SCp; |
| struct NCR_700_command_slot *slot = |
| &hostdata->slots[i]; |
| |
| if(slot->state == NCR_700_SLOT_FREE) |
| continue; |
| |
| SCp = slot->cmnd; |
| printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n", |
| slot, SCp); |
| free_slot(slot, hostdata); |
| SCp->host_scribble = NULL; |
| NCR_700_set_depth(SCp->device, 0); |
| /* NOTE: deadlock potential here: we |
| * rely on mid-layer guarantees that |
| * scsi_done won't try to issue the |
| * command again otherwise we'll |
| * deadlock on the |
| * hostdata->state_lock */ |
| SCp->result = DID_RESET << 16; |
| SCp->scsi_done(SCp); |
| } |
| mdelay(25); |
| NCR_700_chip_setup(host); |
| |
| hostdata->state = NCR_700_HOST_FREE; |
| hostdata->cmd = NULL; |
| /* signal back if this was an eh induced reset */ |
| if(hostdata->eh_complete != NULL) |
| complete(hostdata->eh_complete); |
| goto out_unlock; |
| } else if(sstat0 & SELECTION_TIMEOUT) { |
| DEBUG(("scsi%d: (%d:%d) selection timeout\n", |
| host->host_no, pun, lun)); |
| NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16); |
| } else if(sstat0 & PHASE_MISMATCH) { |
| struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL : |
| (struct NCR_700_command_slot *)SCp->host_scribble; |
| |
| if(dsp == Ent_SendMessage + 8 + hostdata->pScript) { |
| /* It wants to reply to some part of |
| * our message */ |
| #ifdef NCR_700_DEBUG |
| __u32 temp = NCR_700_readl(host, TEMP_REG); |
| int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host)); |
| printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG))); |
| #endif |
| resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch; |
| } else if(dsp >= to32bit(&slot->pSG[0].ins) && |
| dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) { |
| int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff; |
| int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List); |
| int residual = NCR_700_data_residual(host); |
| int i; |
| #ifdef NCR_700_DEBUG |
| __u32 naddr = NCR_700_readl(host, DNAD_REG); |
| |
| printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n", |
| host->host_no, pun, lun, |
| SGcount, data_transfer); |
| scsi_print_command(SCp); |
| if(residual) { |
| printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n", |
| host->host_no, pun, lun, |
| SGcount, data_transfer, residual); |
| } |
| #endif |
| data_transfer += residual; |
| |
| if(data_transfer != 0) { |
| int count; |
| __u32 pAddr; |
| |
| SGcount--; |
| |
| count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff); |
| DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer)); |
| slot->SG[SGcount].ins &= bS_to_host(0xff000000); |
| slot->SG[SGcount].ins |= bS_to_host(data_transfer); |
| pAddr = bS_to_cpu(slot->SG[SGcount].pAddr); |
| pAddr += (count - data_transfer); |
| #ifdef NCR_700_DEBUG |
| if(pAddr != naddr) { |
| printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual); |
| } |
| #endif |
| slot->SG[SGcount].pAddr = bS_to_host(pAddr); |
| } |
| /* set the executed moves to nops */ |
| for(i=0; i<SGcount; i++) { |
| slot->SG[i].ins = bS_to_host(SCRIPT_NOP); |
| slot->SG[i].pAddr = 0; |
| } |
| dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE); |
| /* and pretend we disconnected after |
| * the command phase */ |
| resume_offset = hostdata->pScript + Ent_MsgInDuringData; |
| /* make sure all the data is flushed */ |
| NCR_700_flush_fifo(host); |
| } else { |
| __u8 sbcl = NCR_700_readb(host, SBCL_REG); |
| printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n", |
| host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl)); |
| NCR_700_internal_bus_reset(host); |
| } |
| |
| } else if(sstat0 & SCSI_GROSS_ERROR) { |
| printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n", |
| host->host_no, pun, lun); |
| NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); |
| } else if(sstat0 & PARITY_ERROR) { |
| printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n", |
| host->host_no, pun, lun); |
| NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); |
| } else if(dstat & SCRIPT_INT_RECEIVED) { |
| DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n", |
| host->host_no, pun, lun)); |
| resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata); |
| } else if(dstat & (ILGL_INST_DETECTED)) { |
| printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n" |
| " Please email James.Bottomley@HansenPartnership.com with the details\n", |
| host->host_no, pun, lun, |
| dsp, dsp - hostdata->pScript); |
| NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); |
| } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) { |
| printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n", |
| host->host_no, pun, lun, dstat); |
| NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); |
| } |
| |
| |
| /* NOTE: selection interrupt processing MUST occur |
| * after script interrupt processing to correctly cope |
| * with the case where we process a disconnect and |
| * then get reselected before we process the |
| * disconnection */ |
| if(sstat0 & SELECTED) { |
| /* FIXME: It currently takes at least FOUR |
| * interrupts to complete a command that |
| * disconnects: one for the disconnect, one |
| * for the reselection, one to get the |
| * reselection data and one to complete the |
| * command. If we guess the reselected |
| * command here and prepare it, we only need |
| * to get a reselection data interrupt if we |
| * guessed wrongly. Since the interrupt |
| * overhead is much greater than the command |
| * setup, this would be an efficient |
| * optimisation particularly as we probably |
| * only have one outstanding command on a |
| * target most of the time */ |
| |
| resume_offset = process_selection(host, dsp); |
| |
| } |
| |
| } |
| |
| if(resume_offset) { |
| if(hostdata->state != NCR_700_HOST_BUSY) { |
| printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n", |
| host->host_no, resume_offset, resume_offset - hostdata->pScript); |
| hostdata->state = NCR_700_HOST_BUSY; |
| } |
| |
| DEBUG(("Attempting to resume at %x\n", resume_offset)); |
| NCR_700_clear_fifo(host); |
| NCR_700_writel(resume_offset, host, DSP_REG); |
| } |
| /* There is probably a technical no-no about this: If we're a |
| * shared interrupt and we got this interrupt because the |
| * other device needs servicing not us, we're still going to |
| * check our queued commands here---of course, there shouldn't |
| * be any outstanding.... */ |
| if(hostdata->state == NCR_700_HOST_FREE) { |
| int i; |
| |
| for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) { |
| /* fairness: always run the queue from the last |
| * position we left off */ |
| int j = (i + hostdata->saved_slot_position) |
| % NCR_700_COMMAND_SLOTS_PER_HOST; |
| |
| if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED) |
| continue; |
| if(NCR_700_start_command(hostdata->slots[j].cmnd)) { |
| DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n", |
| host->host_no, &hostdata->slots[j], |
| hostdata->slots[j].cmnd)); |
| hostdata->saved_slot_position = j + 1; |
| } |
| |
| break; |
| } |
| } |
| out_unlock: |
| spin_unlock_irqrestore(host->host_lock, flags); |
| return IRQ_RETVAL(handled); |
| } |
| |
| static int |
| NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *)) |
| { |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; |
| __u32 move_ins; |
| enum dma_data_direction direction; |
| struct NCR_700_command_slot *slot; |
| |
| if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) { |
| /* We're over our allocation, this should never happen |
| * since we report the max allocation to the mid layer */ |
| printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no); |
| return 1; |
| } |
| /* check for untagged commands. We cannot have any outstanding |
| * commands if we accept them. Commands could be untagged because: |
| * |
| * - The tag negotiated bitmap is clear |
| * - The blk layer sent and untagged command |
| */ |
| if(NCR_700_get_depth(SCp->device) != 0 |
| && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp))) |
| || !(SCp->flags & SCMD_TAGGED))) { |
| CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n", |
| NCR_700_get_depth(SCp->device)); |
| return SCSI_MLQUEUE_DEVICE_BUSY; |
| } |
| if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) { |
| CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n", |
| NCR_700_get_depth(SCp->device)); |
| return SCSI_MLQUEUE_DEVICE_BUSY; |
| } |
| NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1); |
| |
| /* begin the command here */ |
| /* no need to check for NULL, test for command_slot_count above |
| * ensures a slot is free */ |
| slot = find_empty_slot(hostdata); |
| |
| slot->cmnd = SCp; |
| |
| SCp->scsi_done = done; |
| SCp->host_scribble = (unsigned char *)slot; |
| SCp->SCp.ptr = NULL; |
| SCp->SCp.buffer = NULL; |
| |
| #ifdef NCR_700_DEBUG |
| printk("53c700: scsi%d, command ", SCp->device->host->host_no); |
| scsi_print_command(SCp); |
| #endif |
| if ((SCp->flags & SCMD_TAGGED) |
| && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0 |
| && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) { |
| scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n"); |
| hostdata->tag_negotiated |= (1<<scmd_id(SCp)); |
| NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION); |
| } |
| |
| /* here we may have to process an untagged command. The gate |
| * above ensures that this will be the only one outstanding, |
| * so clear the tag negotiated bit. |
| * |
| * FIXME: This will royally screw up on multiple LUN devices |
| * */ |
| if (!(SCp->flags & SCMD_TAGGED) |
| && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) { |
| scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n"); |
| hostdata->tag_negotiated &= ~(1<<scmd_id(SCp)); |
| } |
| |
| if((hostdata->tag_negotiated &(1<<scmd_id(SCp))) |
| && scsi_get_tag_type(SCp->device)) { |
| slot->tag = SCp->request->tag; |
| CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n", |
| slot->tag, slot); |
| } else { |
| slot->tag = SCSI_NO_TAG; |
| /* must populate current_cmnd for scsi_find_tag to work */ |
| SCp->device->current_cmnd = SCp; |
| } |
| /* sanity check: some of the commands generated by the mid-layer |
| * have an eccentric idea of their sc_data_direction */ |
| if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) && |
| SCp->sc_data_direction != DMA_NONE) { |
| #ifdef NCR_700_DEBUG |
| printk("53c700: Command"); |
| scsi_print_command(SCp); |
| printk("Has wrong data direction %d\n", SCp->sc_data_direction); |
| #endif |
| SCp->sc_data_direction = DMA_NONE; |
| } |
| |
| switch (SCp->cmnd[0]) { |
| case REQUEST_SENSE: |
| /* clear the internal sense magic */ |
| SCp->cmnd[6] = 0; |
| /* fall through */ |
| default: |
| /* OK, get it from the command */ |
| switch(SCp->sc_data_direction) { |
| case DMA_BIDIRECTIONAL: |
| default: |
| printk(KERN_ERR "53c700: Unknown command for data direction "); |
| scsi_print_command(SCp); |
| |
| move_ins = 0; |
| break; |
| case DMA_NONE: |
| move_ins = 0; |
| break; |
| case DMA_FROM_DEVICE: |
| move_ins = SCRIPT_MOVE_DATA_IN; |
| break; |
| case DMA_TO_DEVICE: |
| move_ins = SCRIPT_MOVE_DATA_OUT; |
| break; |
| } |
| } |
| |
| /* now build the scatter gather list */ |
| direction = SCp->sc_data_direction; |
| if(move_ins != 0) { |
| int i; |
| int sg_count; |
| dma_addr_t vPtr = 0; |
| struct scatterlist *sg; |
| __u32 count = 0; |
| |
| sg_count = scsi_dma_map(SCp); |
| BUG_ON(sg_count < 0); |
| |
| scsi_for_each_sg(SCp, sg, sg_count, i) { |
| vPtr = sg_dma_address(sg); |
| count = sg_dma_len(sg); |
| |
| slot->SG[i].ins = bS_to_host(move_ins | count); |
| DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n", |
| i, count, slot->SG[i].ins, (unsigned long)vPtr)); |
| slot->SG[i].pAddr = bS_to_host(vPtr); |
| } |
| slot->SG[i].ins = bS_to_host(SCRIPT_RETURN); |
| slot->SG[i].pAddr = 0; |
| dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE); |
| DEBUG((" SETTING %08lx to %x\n", |
| (&slot->pSG[i].ins), |
| slot->SG[i].ins)); |
| } |
| slot->resume_offset = 0; |
| slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd, |
| MAX_COMMAND_SIZE, DMA_TO_DEVICE); |
| NCR_700_start_command(SCp); |
| return 0; |
| } |
| |
| STATIC DEF_SCSI_QCMD(NCR_700_queuecommand) |
| |
| STATIC int |
| NCR_700_abort(struct scsi_cmnd * SCp) |
| { |
| struct NCR_700_command_slot *slot; |
| |
| scmd_printk(KERN_INFO, SCp, "abort command\n"); |
| |
| slot = (struct NCR_700_command_slot *)SCp->host_scribble; |
| |
| if(slot == NULL) |
| /* no outstanding command to abort */ |
| return SUCCESS; |
| if(SCp->cmnd[0] == TEST_UNIT_READY) { |
| /* FIXME: This is because of a problem in the new |
| * error handler. When it is in error recovery, it |
| * will send a TUR to a device it thinks may still be |
| * showing a problem. If the TUR isn't responded to, |
| * it will abort it and mark the device off line. |
| * Unfortunately, it does no other error recovery, so |
| * this would leave us with an outstanding command |
| * occupying a slot. Rather than allow this to |
| * happen, we issue a bus reset to force all |
| * outstanding commands to terminate here. */ |
| NCR_700_internal_bus_reset(SCp->device->host); |
| /* still drop through and return failed */ |
| } |
| return FAILED; |
| |
| } |
| |
| STATIC int |
| NCR_700_bus_reset(struct scsi_cmnd * SCp) |
| { |
| DECLARE_COMPLETION_ONSTACK(complete); |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; |
| |
| scmd_printk(KERN_INFO, SCp, |
| "New error handler wants BUS reset, cmd %p\n\t", SCp); |
| scsi_print_command(SCp); |
| |
| /* In theory, eh_complete should always be null because the |
| * eh is single threaded, but just in case we're handling a |
| * reset via sg or something */ |
| spin_lock_irq(SCp->device->host->host_lock); |
| while (hostdata->eh_complete != NULL) { |
| spin_unlock_irq(SCp->device->host->host_lock); |
| msleep_interruptible(100); |
| spin_lock_irq(SCp->device->host->host_lock); |
| } |
| |
| hostdata->eh_complete = &complete; |
| NCR_700_internal_bus_reset(SCp->device->host); |
| |
| spin_unlock_irq(SCp->device->host->host_lock); |
| wait_for_completion(&complete); |
| spin_lock_irq(SCp->device->host->host_lock); |
| |
| hostdata->eh_complete = NULL; |
| /* Revalidate the transport parameters of the failing device */ |
| if(hostdata->fast) |
| spi_schedule_dv_device(SCp->device); |
| |
| spin_unlock_irq(SCp->device->host->host_lock); |
| return SUCCESS; |
| } |
| |
| STATIC int |
| NCR_700_host_reset(struct scsi_cmnd * SCp) |
| { |
| scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t"); |
| scsi_print_command(SCp); |
| |
| spin_lock_irq(SCp->device->host->host_lock); |
| |
| NCR_700_internal_bus_reset(SCp->device->host); |
| NCR_700_chip_reset(SCp->device->host); |
| |
| spin_unlock_irq(SCp->device->host->host_lock); |
| |
| return SUCCESS; |
| } |
| |
| STATIC void |
| NCR_700_set_period(struct scsi_target *STp, int period) |
| { |
| struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent); |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)SHp->hostdata[0]; |
| |
| if(!hostdata->fast) |
| return; |
| |
| if(period < hostdata->min_period) |
| period = hostdata->min_period; |
| |
| spi_period(STp) = period; |
| spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC | |
| NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
| spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION; |
| } |
| |
| STATIC void |
| NCR_700_set_offset(struct scsi_target *STp, int offset) |
| { |
| struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent); |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)SHp->hostdata[0]; |
| int max_offset = hostdata->chip710 |
| ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET; |
| |
| if(!hostdata->fast) |
| return; |
| |
| if(offset > max_offset) |
| offset = max_offset; |
| |
| /* if we're currently async, make sure the period is reasonable */ |
| if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period || |
| spi_period(STp) > 0xff)) |
| spi_period(STp) = hostdata->min_period; |
| |
| spi_offset(STp) = offset; |
| spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC | |
| NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
| spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION; |
| } |
| |
| STATIC int |
| NCR_700_slave_alloc(struct scsi_device *SDp) |
| { |
| SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters), |
| GFP_KERNEL); |
| |
| if (!SDp->hostdata) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| STATIC int |
| NCR_700_slave_configure(struct scsi_device *SDp) |
| { |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; |
| |
| /* to do here: allocate memory; build a queue_full list */ |
| if(SDp->tagged_supported) { |
| scsi_set_tag_type(SDp, MSG_ORDERED_TAG); |
| scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS); |
| NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION); |
| } else { |
| /* initialise to default depth */ |
| scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun); |
| } |
| if(hostdata->fast) { |
| /* Find the correct offset and period via domain validation */ |
| if (!spi_initial_dv(SDp->sdev_target)) |
| spi_dv_device(SDp); |
| } else { |
| spi_offset(SDp->sdev_target) = 0; |
| spi_period(SDp->sdev_target) = 0; |
| } |
| return 0; |
| } |
| |
| STATIC void |
| NCR_700_slave_destroy(struct scsi_device *SDp) |
| { |
| kfree(SDp->hostdata); |
| SDp->hostdata = NULL; |
| } |
| |
| static int |
| NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason) |
| { |
| if (reason != SCSI_QDEPTH_DEFAULT) |
| return -EOPNOTSUPP; |
| |
| if (depth > NCR_700_MAX_TAGS) |
| depth = NCR_700_MAX_TAGS; |
| |
| scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth); |
| return depth; |
| } |
| |
| static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type) |
| { |
| int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0) |
| || (tag_type != 0 && scsi_get_tag_type(SDp) == 0)); |
| struct NCR_700_Host_Parameters *hostdata = |
| (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; |
| |
| scsi_set_tag_type(SDp, tag_type); |
| |
| /* We have a global (per target) flag to track whether TCQ is |
| * enabled, so we'll be turning it off for the entire target here. |
| * our tag algorithm will fail if we mix tagged and untagged commands, |
| * so quiesce the device before doing this */ |
| if (change_tag) |
| scsi_target_quiesce(SDp->sdev_target); |
| |
| if (!tag_type) { |
| /* shift back to the default unqueued number of commands |
| * (the user can still raise this) */ |
| scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun); |
| hostdata->tag_negotiated &= ~(1 << sdev_id(SDp)); |
| } else { |
| /* Here, we cleared the negotiation flag above, so this |
| * will force the driver to renegotiate */ |
| scsi_activate_tcq(SDp, SDp->queue_depth); |
| if (change_tag) |
| NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION); |
| } |
| if (change_tag) |
| scsi_target_resume(SDp->sdev_target); |
| |
| return tag_type; |
| } |
| |
| static ssize_t |
| NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct scsi_device *SDp = to_scsi_device(dev); |
| |
| return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp)); |
| } |
| |
| static struct device_attribute NCR_700_active_tags_attr = { |
| .attr = { |
| .name = "active_tags", |
| .mode = S_IRUGO, |
| }, |
| .show = NCR_700_show_active_tags, |
| }; |
| |
| STATIC struct device_attribute *NCR_700_dev_attrs[] = { |
| &NCR_700_active_tags_attr, |
| NULL, |
| }; |
| |
| EXPORT_SYMBOL(NCR_700_detect); |
| EXPORT_SYMBOL(NCR_700_release); |
| EXPORT_SYMBOL(NCR_700_intr); |
| |
| static struct spi_function_template NCR_700_transport_functions = { |
| .set_period = NCR_700_set_period, |
| .show_period = 1, |
| .set_offset = NCR_700_set_offset, |
| .show_offset = 1, |
| }; |
| |
| static int __init NCR_700_init(void) |
| { |
| NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions); |
| if(!NCR_700_transport_template) |
| return -ENODEV; |
| return 0; |
| } |
| |
| static void __exit NCR_700_exit(void) |
| { |
| spi_release_transport(NCR_700_transport_template); |
| } |
| |
| module_init(NCR_700_init); |
| module_exit(NCR_700_exit); |
| |