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 00000000000..a591fcb8aab --- /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]); + } |