diff options
Diffstat (limited to 'drivers/scsi/53c700.c')
| -rw-r--r-- | drivers/scsi/53c700.c | 2175 |
1 files changed, 2175 insertions, 0 deletions
diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c new file mode 100644 index 000000000000..a591fcb8aab1 --- /dev/null +++ b/drivers/scsi/53c700.c @@ -0,0 +1,2175 @@ +/* -*- 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/config.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/ioport.h> +#include <linux/delay.h> +#include <linux/spinlock.h> +#include <linux/completion.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/blkdev.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <asm/dma.h> +#include <asm/system.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_cmnd *, void (*done)(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_dev_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_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); +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", +}; + +static __u8 NCR_700_SDTR_msg[] = { + 0x01, /* Extended message */ + 0x03, /* Extended message Length */ + 0x01, /* SDTR Extended message */ + NCR_700_MIN_PERIOD, + NCR_700_MAX_OFFSET +}; + +/* 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_SDTR_msg[3]*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) { + printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n", + 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; + /* all of these offsets are L1_CACHE_BYTES separated. It is fatal + * if this isn't sufficient separation to avoid dma flushing issues */ + BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment()); + 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_device_reset_handler = NCR_700_dev_reset; + 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->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 < sizeof(SCRIPT)/sizeof(SCRIPT[0]); 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(script, MessageLocation, + pScript + MSGOUT_OFFSET); + script_patch_32(script, StatusAddress, + pScript + STATUS_OFFSET); + script_patch_32(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 = 7; + host->max_lun = NCR_700_MAX_LUNS; + BUG_ON(NCR_700_transport_template == NULL); + host->transportt = NCR_700_transport_template; + host->unique_id = hostdata->base; + host->base = 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; + 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) { + if(SCp->use_sg) { + dma_unmap_sg(hostdata->dev, SCp->buffer, + SCp->use_sg, SCp->sc_data_direction); + } else { + dma_unmap_single(hostdata->dev, slot->dma_handle, + SCp->request_bufflen, + SCp->sc_data_direction); + } + } +} + +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; + + NCR_700_unmap(hostdata, SCp, slot); + dma_unmap_single(hostdata->dev, slot->pCmd, + sizeof(SCp->cmnd), DMA_TO_DEVICE); + if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) { +#ifdef NCR_700_DEBUG + printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n", + SCp, SCp->cmnd[7], result); + scsi_print_sense("53c700", SCp); + +#endif + /* restore the old result if the request sense was + * successful */ + if(result == 0) + result = SCp->cmnd[7]; + /* now restore the original command */ + memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd, + sizeof(SCp->data_cmnd)); + SCp->request_buffer = SCp->buffer; + SCp->request_bufflen = SCp->bufflen; + SCp->use_sg = SCp->old_use_sg; + SCp->cmd_len = SCp->old_cmd_len; + SCp->sc_data_direction = SCp->sc_old_data_direction; + SCp->underflow = SCp->old_underflow; + + } + 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]; + __u32 dcntl_extra = 0; + __u8 min_period; + __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP); + + if(hostdata->chip710) { + __u8 burst_disable = hostdata->burst_disable + ? BURST_DISABLE : 0; + dcntl_extra = COMPAT_700_MODE; + + NCR_700_writeb(dcntl_extra, host, DCNTL_REG); + NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra, + host, DMODE_710_REG); + NCR_700_writeb(burst_disable | (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 | 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 | 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 | 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 | 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 | 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 */ + printk(KERN_WARNING "scsi%d Unexpected SDTR msg\n", + host->host_no); + hostdata->msgout[0] = A_REJECT_MSG; + dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); + script_patch_16(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->msgout, 1, DMA_TO_DEVICE); + script_patch_16(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]); + scsi_print_msg(hostdata->msgin); + printk("\n"); + /* just reject it */ + hostdata->msgout[0] = A_REJECT_MSG; + dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); + script_patch_16(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]); + scsi_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 */ + printk(KERN_WARNING "scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host->host_no, pun, lun); + /* we're done negotiating */ + NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION); + hostdata->tag_negotiated &= ~(1<<SCp->device->id); + SCp->device->tagged_supported = 0; + scsi_deactivate_tcq(SCp->device, host->cmd_per_lun); + } else { + printk(KERN_WARNING "scsi%d (%d:%d) Unexpected REJECT Message %s\n", + host->host_no, 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]); + + scsi_print_msg(hostdata->msgin); + printk("\n"); + /* just reject it */ + hostdata->msgout[0] = A_REJECT_MSG; + dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE); + script_patch_16(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->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(SCp->cmnd[0] == REQUEST_SENSE) { + /* OOPS: bad device, returning another + * contingent allegiance condition */ + printk(KERN_ERR "scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host->host_no, pun, lun); + NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); + } else { +#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); + + SCp->cmnd[0] = REQUEST_SENSE; + SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5; + SCp->cmnd[2] = 0; + SCp->cmnd[3] = 0; + SCp->cmnd[4] = sizeof(SCp->sense_buffer); + SCp->cmnd[5] = 0; + SCp->cmd_len = 6; + /* 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 */ + SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC; + SCp->cmnd[7] = hostdata->status[0]; + SCp->use_sg = 0; + SCp->sc_data_direction = DMA_FROM_DEVICE; + dma_sync_single_for_device(hostdata->dev, slot->pCmd, + SCp->cmd_len, DMA_TO_DEVICE); + SCp->request_bufflen = sizeof(SCp->sense_buffer); + slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE); + slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer)); + 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(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE); + dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE); + + /* queue the command for reissue */ + slot->state = NCR_700_SLOT_QUEUED; + 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) { + // printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun); + // hostdata->tag_negotiated |= (1<<SCp->device->id); + // 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<<SCp->device->id); + // } + //} + NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); + } + } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) { + __u8 i = (dsps & 0xf00) >> 8; + + printk(KERN_ERR "scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n", + host->host_no, pun, lun, + NCR_700_phase[i], + sbcl_to_string(NCR_700_readb(host, SBCL_REG))); + printk(KERN_ERR " 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; + DEBUG(("53c700: %d:%d:%d, reselection is tag %d, slot %p(%d)\n", + host->host_no, SDp->id, SDp->lun, + hostdata->msgin[2], slot, slot->tag)); + } else { + struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG); + if(unlikely(SCp == NULL)) { + printk(KERN_ERR "scsi%d: (%d:%d) no saved request for untagged cmd\n", + host->host_no, reselection_id, lun); + 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->script, CommandAddress, + slot->pCmd); + script_patch_16(hostdata->script, + CommandCount, slot->cmnd->cmd_len); + script_patch_32_abs(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->msgin, + MSG_ARRAY_SIZE, DMA_FROM_DEVICE); + dma_cache_sync(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(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->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) { + scsi_print_command(SCp); + + if(SCp->use_sg) { + for(i = 0; i < SCp->use_sg + 1; i++) { + printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->buffer)[i].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->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 */ + + 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, + SCp->device->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) { + 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<<SCp->device->id)) + && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) { + count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]); + } + + if(hostdata->fast && + NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) { + memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg, + sizeof(NCR_700_SDTR_msg)); + hostdata->msgout[count+3] = spi_period(SCp->device->sdev_target); + hostdata->msgout[count+4] = spi_offset(SCp->device->sdev_target); + count += sizeof(NCR_700_SDTR_msg); + NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); + } + + script_patch_16(hostdata->script, MessageCount, count); + + + script_patch_ID(hostdata->script, + Device_ID, 1<<SCp->device->id); + + script_patch_32_abs(hostdata->script, CommandAddress, + slot->pCmd); + script_patch_16(hostdata->script, CommandCount, SCp->cmd_len); + /* finally plumb the beginning of the SG list into the script + * */ + script_patch_32_abs(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->msgout, count, DMA_TO_DEVICE); + dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, + DMA_FROM_DEVICE); + dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE); + dma_cache_sync(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 pt_regs *regs) +{ + 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 acess 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) + SDp->hostdata = NULL; + + /* 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(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(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<<SCp->device->id)) + || !blk_rq_tagged(SCp->request))) { + DEBUG((KERN_ERR "scsi%d (%d:%d) has non zero depth %d\n", + SCp->device->host->host_no, SCp->device->id, SCp->device->lun, + NCR_700_get_depth(SCp->device))); + return SCSI_MLQUEUE_DEVICE_BUSY; + } + if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) { + DEBUG((KERN_ERR "scsi%d (%d:%d) has max tag depth %d\n", + SCp->device->host->host_no, SCp->device->id, SCp->device->lun, + 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(blk_rq_tagged(SCp->request) + && (hostdata->tag_negotiated &(1<<SCp->device->id)) == 0 + && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) { + printk(KERN_ERR "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun); + hostdata->tag_negotiated |= (1<<SCp->device->id); + 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(!blk_rq_tagged(SCp->request) + && (hostdata->tag_negotiated &(1<<SCp->device->id))) { + printk(KERN_INFO "scsi%d: (%d:%d) Disabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun); + hostdata->tag_negotiated &= ~(1<<SCp->device->id); + } + + if((hostdata->tag_negotiated &(1<<SCp->device->id)) + && scsi_get_tag_type(SCp->device)) { + slot->tag = SCp->request->tag; + DEBUG(("53c700 %d:%d:%d, sending out tag %d, slot %p\n", + SCp->device->host->host_no, SCp->device->id, SCp->device->lun, 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(!SCp->use_sg && !SCp->request_bufflen + && 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; + __u32 count = 0; + + if(SCp->use_sg) { + sg_count = dma_map_sg(hostdata->dev, SCp->buffer, + SCp->use_sg, direction); + } else { + vPtr = dma_map_single(hostdata->dev, + SCp->request_buffer, + SCp->request_bufflen, + direction); + count = SCp->request_bufflen; + slot->dma_handle = vPtr; + sg_count = 1; + } + + + for(i = 0; i < sg_count; i++) { + + if(SCp->use_sg) { + struct scatterlist *sg = SCp->buffer; + + vPtr = sg_dma_address(&sg[i]); + count = sg_dma_len(&sg[i]); + } + + 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(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, + sizeof(SCp->cmnd), DMA_TO_DEVICE); + NCR_700_start_command(SCp); + return 0; +} + +STATIC int +NCR_700_abort(struct scsi_cmnd * SCp) +{ + struct NCR_700_command_slot *slot; + + printk(KERN_INFO "scsi%d (%d:%d) New error handler wants to abort command\n\t", + SCp->device->host->host_no, SCp->device->id, SCp->device->lun); + scsi_print_command(SCp); + + 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(complete); + struct NCR_700_Host_Parameters *hostdata = + (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; + + printk(KERN_INFO "scsi%d (%d:%d) New error handler wants BUS reset, cmd %p\n\t", + SCp->device->host->host_no, SCp->device->id, SCp->device->lun, 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 */ + 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); + return SUCCESS; +} + +STATIC int +NCR_700_dev_reset(struct scsi_cmnd * SCp) +{ + printk(KERN_INFO "scsi%d (%d:%d) New error handler wants device reset\n\t", + SCp->device->host->host_no, SCp->device->id, SCp->device->lun); + scsi_print_command(SCp); + + return FAILED; +} + +STATIC int +NCR_700_host_reset(struct scsi_cmnd * SCp) +{ + printk(KERN_INFO "scsi%d (%d:%d) New error handler wants HOST reset\n\t", + SCp->device->host->host_no, SCp->device->id, SCp->device->lun); + scsi_print_command(SCp); + + NCR_700_internal_bus_reset(SCp->device->host); + NCR_700_chip_reset(SCp->device->host); + 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_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) +{ + /* to do here: deallocate memory */ +} + +static int +NCR_700_change_queue_depth(struct scsi_device *SDp, int depth) +{ + 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 << SDp->id); + } 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, 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); + |