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1640 lines
44 KiB
1640 lines
44 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Parallel SCSI (SPI) transport specific attributes exported to sysfs. |
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* |
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* Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved. |
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* Copyright (c) 2004, 2005 James Bottomley <[email protected]> |
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*/ |
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#include <linux/ctype.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/workqueue.h> |
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#include <linux/blkdev.h> |
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#include <linux/mutex.h> |
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#include <linux/sysfs.h> |
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#include <linux/slab.h> |
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#include <linux/suspend.h> |
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#include <scsi/scsi.h> |
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#include "scsi_priv.h" |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_eh.h> |
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#include <scsi/scsi_tcq.h> |
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#include <scsi/scsi_transport.h> |
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#include <scsi/scsi_transport_spi.h> |
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|
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#define SPI_NUM_ATTRS 14 /* increase this if you add attributes */ |
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#define SPI_OTHER_ATTRS 1 /* Increase this if you add "always |
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* on" attributes */ |
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#define SPI_HOST_ATTRS 1 |
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|
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#define SPI_MAX_ECHO_BUFFER_SIZE 4096 |
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|
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#define DV_LOOPS 3 |
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#define DV_TIMEOUT (10*HZ) |
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#define DV_RETRIES 3 /* should only need at most |
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* two cc/ua clears */ |
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|
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/* Our blacklist flags */ |
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enum { |
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SPI_BLIST_NOIUS = (__force blist_flags_t)0x1, |
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}; |
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|
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/* blacklist table, modelled on scsi_devinfo.c */ |
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static struct { |
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char *vendor; |
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char *model; |
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blist_flags_t flags; |
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} spi_static_device_list[] __initdata = { |
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{"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS }, |
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{"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS }, |
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{NULL, NULL, 0} |
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}; |
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|
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/* Private data accessors (keep these out of the header file) */ |
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#define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress) |
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#define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex) |
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|
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struct spi_internal { |
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struct scsi_transport_template t; |
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struct spi_function_template *f; |
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}; |
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|
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#define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t) |
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|
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static const int ppr_to_ps[] = { |
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/* The PPR values 0-6 are reserved, fill them in when |
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* the committee defines them */ |
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-1, /* 0x00 */ |
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-1, /* 0x01 */ |
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-1, /* 0x02 */ |
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-1, /* 0x03 */ |
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-1, /* 0x04 */ |
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-1, /* 0x05 */ |
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-1, /* 0x06 */ |
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3125, /* 0x07 */ |
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6250, /* 0x08 */ |
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12500, /* 0x09 */ |
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25000, /* 0x0a */ |
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30300, /* 0x0b */ |
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50000, /* 0x0c */ |
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}; |
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/* The PPR values at which you calculate the period in ns by multiplying |
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* by 4 */ |
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#define SPI_STATIC_PPR 0x0c |
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|
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static int sprint_frac(char *dest, int value, int denom) |
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{ |
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int frac = value % denom; |
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int result = sprintf(dest, "%d", value / denom); |
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|
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if (frac == 0) |
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return result; |
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dest[result++] = '.'; |
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|
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do { |
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denom /= 10; |
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sprintf(dest + result, "%d", frac / denom); |
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result++; |
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frac %= denom; |
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} while (frac); |
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|
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dest[result++] = '\0'; |
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return result; |
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} |
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|
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static int spi_execute(struct scsi_device *sdev, const void *cmd, |
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enum dma_data_direction dir, |
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void *buffer, unsigned bufflen, |
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struct scsi_sense_hdr *sshdr) |
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{ |
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int i, result; |
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unsigned char sense[SCSI_SENSE_BUFFERSIZE]; |
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struct scsi_sense_hdr sshdr_tmp; |
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|
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if (!sshdr) |
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sshdr = &sshdr_tmp; |
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|
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for(i = 0; i < DV_RETRIES; i++) { |
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/* |
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* The purpose of the RQF_PM flag below is to bypass the |
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* SDEV_QUIESCE state. |
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*/ |
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result = scsi_execute(sdev, cmd, dir, buffer, bufflen, sense, |
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sshdr, DV_TIMEOUT, /* retries */ 1, |
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REQ_FAILFAST_DEV | |
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REQ_FAILFAST_TRANSPORT | |
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REQ_FAILFAST_DRIVER, |
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RQF_PM, NULL); |
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if (result < 0 || !scsi_sense_valid(sshdr) || |
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sshdr->sense_key != UNIT_ATTENTION) |
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break; |
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} |
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return result; |
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} |
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|
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static struct { |
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enum spi_signal_type value; |
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char *name; |
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} signal_types[] = { |
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{ SPI_SIGNAL_UNKNOWN, "unknown" }, |
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{ SPI_SIGNAL_SE, "SE" }, |
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{ SPI_SIGNAL_LVD, "LVD" }, |
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{ SPI_SIGNAL_HVD, "HVD" }, |
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}; |
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|
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static inline const char *spi_signal_to_string(enum spi_signal_type type) |
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{ |
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int i; |
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|
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for (i = 0; i < ARRAY_SIZE(signal_types); i++) { |
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if (type == signal_types[i].value) |
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return signal_types[i].name; |
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} |
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return NULL; |
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} |
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static inline enum spi_signal_type spi_signal_to_value(const char *name) |
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{ |
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int i, len; |
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|
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for (i = 0; i < ARRAY_SIZE(signal_types); i++) { |
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len = strlen(signal_types[i].name); |
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if (strncmp(name, signal_types[i].name, len) == 0 && |
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(name[len] == '\n' || name[len] == '\0')) |
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return signal_types[i].value; |
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} |
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return SPI_SIGNAL_UNKNOWN; |
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} |
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|
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static int spi_host_setup(struct transport_container *tc, struct device *dev, |
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struct device *cdev) |
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{ |
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struct Scsi_Host *shost = dev_to_shost(dev); |
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|
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spi_signalling(shost) = SPI_SIGNAL_UNKNOWN; |
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|
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return 0; |
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} |
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|
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static int spi_host_configure(struct transport_container *tc, |
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struct device *dev, |
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struct device *cdev); |
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|
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static DECLARE_TRANSPORT_CLASS(spi_host_class, |
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"spi_host", |
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spi_host_setup, |
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NULL, |
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spi_host_configure); |
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|
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static int spi_host_match(struct attribute_container *cont, |
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struct device *dev) |
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{ |
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struct Scsi_Host *shost; |
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|
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if (!scsi_is_host_device(dev)) |
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return 0; |
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|
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shost = dev_to_shost(dev); |
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if (!shost->transportt || shost->transportt->host_attrs.ac.class |
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!= &spi_host_class.class) |
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return 0; |
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|
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return &shost->transportt->host_attrs.ac == cont; |
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} |
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|
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static int spi_target_configure(struct transport_container *tc, |
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struct device *dev, |
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struct device *cdev); |
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|
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static int spi_device_configure(struct transport_container *tc, |
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struct device *dev, |
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struct device *cdev) |
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{ |
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struct scsi_device *sdev = to_scsi_device(dev); |
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struct scsi_target *starget = sdev->sdev_target; |
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blist_flags_t bflags; |
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|
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bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8], |
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&sdev->inquiry[16], |
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SCSI_DEVINFO_SPI); |
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|
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/* Populate the target capability fields with the values |
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* gleaned from the device inquiry */ |
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|
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spi_support_sync(starget) = scsi_device_sync(sdev); |
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spi_support_wide(starget) = scsi_device_wide(sdev); |
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spi_support_dt(starget) = scsi_device_dt(sdev); |
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spi_support_dt_only(starget) = scsi_device_dt_only(sdev); |
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spi_support_ius(starget) = scsi_device_ius(sdev); |
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if (bflags & SPI_BLIST_NOIUS) { |
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dev_info(dev, "Information Units disabled by blacklist\n"); |
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spi_support_ius(starget) = 0; |
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} |
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spi_support_qas(starget) = scsi_device_qas(sdev); |
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|
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return 0; |
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} |
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|
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static int spi_setup_transport_attrs(struct transport_container *tc, |
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struct device *dev, |
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struct device *cdev) |
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{ |
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struct scsi_target *starget = to_scsi_target(dev); |
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|
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spi_period(starget) = -1; /* illegal value */ |
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spi_min_period(starget) = 0; |
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spi_offset(starget) = 0; /* async */ |
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spi_max_offset(starget) = 255; |
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spi_width(starget) = 0; /* narrow */ |
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spi_max_width(starget) = 1; |
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spi_iu(starget) = 0; /* no IU */ |
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spi_max_iu(starget) = 1; |
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spi_dt(starget) = 0; /* ST */ |
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spi_qas(starget) = 0; |
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spi_max_qas(starget) = 1; |
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spi_wr_flow(starget) = 0; |
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spi_rd_strm(starget) = 0; |
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spi_rti(starget) = 0; |
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spi_pcomp_en(starget) = 0; |
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spi_hold_mcs(starget) = 0; |
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spi_dv_pending(starget) = 0; |
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spi_dv_in_progress(starget) = 0; |
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spi_initial_dv(starget) = 0; |
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mutex_init(&spi_dv_mutex(starget)); |
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|
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return 0; |
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} |
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|
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#define spi_transport_show_simple(field, format_string) \ |
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\ |
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static ssize_t \ |
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show_spi_transport_##field(struct device *dev, \ |
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struct device_attribute *attr, char *buf) \ |
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{ \ |
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struct scsi_target *starget = transport_class_to_starget(dev); \ |
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struct spi_transport_attrs *tp; \ |
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\ |
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tp = (struct spi_transport_attrs *)&starget->starget_data; \ |
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return snprintf(buf, 20, format_string, tp->field); \ |
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} |
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|
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#define spi_transport_store_simple(field, format_string) \ |
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\ |
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static ssize_t \ |
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store_spi_transport_##field(struct device *dev, \ |
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struct device_attribute *attr, \ |
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const char *buf, size_t count) \ |
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{ \ |
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int val; \ |
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struct scsi_target *starget = transport_class_to_starget(dev); \ |
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struct spi_transport_attrs *tp; \ |
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\ |
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tp = (struct spi_transport_attrs *)&starget->starget_data; \ |
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val = simple_strtoul(buf, NULL, 0); \ |
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tp->field = val; \ |
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return count; \ |
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} |
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|
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#define spi_transport_show_function(field, format_string) \ |
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\ |
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static ssize_t \ |
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show_spi_transport_##field(struct device *dev, \ |
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struct device_attribute *attr, char *buf) \ |
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{ \ |
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struct scsi_target *starget = transport_class_to_starget(dev); \ |
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ |
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struct spi_transport_attrs *tp; \ |
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struct spi_internal *i = to_spi_internal(shost->transportt); \ |
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tp = (struct spi_transport_attrs *)&starget->starget_data; \ |
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if (i->f->get_##field) \ |
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i->f->get_##field(starget); \ |
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return snprintf(buf, 20, format_string, tp->field); \ |
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} |
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|
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#define spi_transport_store_function(field, format_string) \ |
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static ssize_t \ |
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store_spi_transport_##field(struct device *dev, \ |
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struct device_attribute *attr, \ |
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const char *buf, size_t count) \ |
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{ \ |
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int val; \ |
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struct scsi_target *starget = transport_class_to_starget(dev); \ |
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ |
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struct spi_internal *i = to_spi_internal(shost->transportt); \ |
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\ |
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if (!i->f->set_##field) \ |
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return -EINVAL; \ |
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val = simple_strtoul(buf, NULL, 0); \ |
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i->f->set_##field(starget, val); \ |
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return count; \ |
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} |
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|
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#define spi_transport_store_max(field, format_string) \ |
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static ssize_t \ |
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store_spi_transport_##field(struct device *dev, \ |
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struct device_attribute *attr, \ |
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const char *buf, size_t count) \ |
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{ \ |
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int val; \ |
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struct scsi_target *starget = transport_class_to_starget(dev); \ |
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ |
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struct spi_internal *i = to_spi_internal(shost->transportt); \ |
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struct spi_transport_attrs *tp \ |
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= (struct spi_transport_attrs *)&starget->starget_data; \ |
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\ |
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if (!i->f->set_##field) \ |
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return -EINVAL; \ |
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val = simple_strtoul(buf, NULL, 0); \ |
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if (val > tp->max_##field) \ |
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val = tp->max_##field; \ |
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i->f->set_##field(starget, val); \ |
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return count; \ |
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} |
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|
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#define spi_transport_rd_attr(field, format_string) \ |
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spi_transport_show_function(field, format_string) \ |
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spi_transport_store_function(field, format_string) \ |
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static DEVICE_ATTR(field, S_IRUGO, \ |
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show_spi_transport_##field, \ |
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store_spi_transport_##field); |
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|
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#define spi_transport_simple_attr(field, format_string) \ |
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spi_transport_show_simple(field, format_string) \ |
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spi_transport_store_simple(field, format_string) \ |
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static DEVICE_ATTR(field, S_IRUGO, \ |
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show_spi_transport_##field, \ |
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store_spi_transport_##field); |
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|
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#define spi_transport_max_attr(field, format_string) \ |
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spi_transport_show_function(field, format_string) \ |
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spi_transport_store_max(field, format_string) \ |
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spi_transport_simple_attr(max_##field, format_string) \ |
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static DEVICE_ATTR(field, S_IRUGO, \ |
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show_spi_transport_##field, \ |
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store_spi_transport_##field); |
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|
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/* The Parallel SCSI Tranport Attributes: */ |
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spi_transport_max_attr(offset, "%d\n"); |
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spi_transport_max_attr(width, "%d\n"); |
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spi_transport_max_attr(iu, "%d\n"); |
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spi_transport_rd_attr(dt, "%d\n"); |
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spi_transport_max_attr(qas, "%d\n"); |
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spi_transport_rd_attr(wr_flow, "%d\n"); |
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spi_transport_rd_attr(rd_strm, "%d\n"); |
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spi_transport_rd_attr(rti, "%d\n"); |
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spi_transport_rd_attr(pcomp_en, "%d\n"); |
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spi_transport_rd_attr(hold_mcs, "%d\n"); |
|
|
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/* we only care about the first child device that's a real SCSI device |
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* so we return 1 to terminate the iteration when we find it */ |
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static int child_iter(struct device *dev, void *data) |
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{ |
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if (!scsi_is_sdev_device(dev)) |
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return 0; |
|
|
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spi_dv_device(to_scsi_device(dev)); |
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return 1; |
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} |
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|
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static ssize_t |
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store_spi_revalidate(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct scsi_target *starget = transport_class_to_starget(dev); |
|
|
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device_for_each_child(&starget->dev, NULL, child_iter); |
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return count; |
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} |
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static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate); |
|
|
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/* Translate the period into ns according to the current spec |
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* for SDTR/PPR messages */ |
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static int period_to_str(char *buf, int period) |
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{ |
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int len, picosec; |
|
|
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if (period < 0 || period > 0xff) { |
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picosec = -1; |
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} else if (period <= SPI_STATIC_PPR) { |
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picosec = ppr_to_ps[period]; |
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} else { |
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picosec = period * 4000; |
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} |
|
|
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if (picosec == -1) { |
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len = sprintf(buf, "reserved"); |
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} else { |
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len = sprint_frac(buf, picosec, 1000); |
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} |
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|
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return len; |
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} |
|
|
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static ssize_t |
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show_spi_transport_period_helper(char *buf, int period) |
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{ |
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int len = period_to_str(buf, period); |
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buf[len++] = '\n'; |
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buf[len] = '\0'; |
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return len; |
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} |
|
|
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static ssize_t |
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store_spi_transport_period_helper(struct device *dev, const char *buf, |
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size_t count, int *periodp) |
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{ |
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int j, picosec, period = -1; |
|
char *endp; |
|
|
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picosec = simple_strtoul(buf, &endp, 10) * 1000; |
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if (*endp == '.') { |
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int mult = 100; |
|
do { |
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endp++; |
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if (!isdigit(*endp)) |
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break; |
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picosec += (*endp - '0') * mult; |
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mult /= 10; |
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} while (mult > 0); |
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} |
|
|
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for (j = 0; j <= SPI_STATIC_PPR; j++) { |
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if (ppr_to_ps[j] < picosec) |
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continue; |
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period = j; |
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break; |
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} |
|
|
|
if (period == -1) |
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period = picosec / 4000; |
|
|
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if (period > 0xff) |
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period = 0xff; |
|
|
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*periodp = period; |
|
|
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return count; |
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} |
|
|
|
static ssize_t |
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show_spi_transport_period(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct scsi_target *starget = transport_class_to_starget(dev); |
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
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struct spi_internal *i = to_spi_internal(shost->transportt); |
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struct spi_transport_attrs *tp = |
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(struct spi_transport_attrs *)&starget->starget_data; |
|
|
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if (i->f->get_period) |
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i->f->get_period(starget); |
|
|
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return show_spi_transport_period_helper(buf, tp->period); |
|
} |
|
|
|
static ssize_t |
|
store_spi_transport_period(struct device *cdev, struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct scsi_target *starget = transport_class_to_starget(cdev); |
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
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struct spi_internal *i = to_spi_internal(shost->transportt); |
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struct spi_transport_attrs *tp = |
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(struct spi_transport_attrs *)&starget->starget_data; |
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int period, retval; |
|
|
|
if (!i->f->set_period) |
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return -EINVAL; |
|
|
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retval = store_spi_transport_period_helper(cdev, buf, count, &period); |
|
|
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if (period < tp->min_period) |
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period = tp->min_period; |
|
|
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i->f->set_period(starget, period); |
|
|
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return retval; |
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} |
|
|
|
static DEVICE_ATTR(period, S_IRUGO, |
|
show_spi_transport_period, |
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store_spi_transport_period); |
|
|
|
static ssize_t |
|
show_spi_transport_min_period(struct device *cdev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct scsi_target *starget = transport_class_to_starget(cdev); |
|
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
|
struct spi_internal *i = to_spi_internal(shost->transportt); |
|
struct spi_transport_attrs *tp = |
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(struct spi_transport_attrs *)&starget->starget_data; |
|
|
|
if (!i->f->set_period) |
|
return -EINVAL; |
|
|
|
return show_spi_transport_period_helper(buf, tp->min_period); |
|
} |
|
|
|
static ssize_t |
|
store_spi_transport_min_period(struct device *cdev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct scsi_target *starget = transport_class_to_starget(cdev); |
|
struct spi_transport_attrs *tp = |
|
(struct spi_transport_attrs *)&starget->starget_data; |
|
|
|
return store_spi_transport_period_helper(cdev, buf, count, |
|
&tp->min_period); |
|
} |
|
|
|
|
|
static DEVICE_ATTR(min_period, S_IRUGO, |
|
show_spi_transport_min_period, |
|
store_spi_transport_min_period); |
|
|
|
|
|
static ssize_t show_spi_host_signalling(struct device *cdev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct Scsi_Host *shost = transport_class_to_shost(cdev); |
|
struct spi_internal *i = to_spi_internal(shost->transportt); |
|
|
|
if (i->f->get_signalling) |
|
i->f->get_signalling(shost); |
|
|
|
return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost))); |
|
} |
|
static ssize_t store_spi_host_signalling(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct Scsi_Host *shost = transport_class_to_shost(dev); |
|
struct spi_internal *i = to_spi_internal(shost->transportt); |
|
enum spi_signal_type type = spi_signal_to_value(buf); |
|
|
|
if (!i->f->set_signalling) |
|
return -EINVAL; |
|
|
|
if (type != SPI_SIGNAL_UNKNOWN) |
|
i->f->set_signalling(shost, type); |
|
|
|
return count; |
|
} |
|
static DEVICE_ATTR(signalling, S_IRUGO, |
|
show_spi_host_signalling, |
|
store_spi_host_signalling); |
|
|
|
static ssize_t show_spi_host_width(struct device *cdev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct Scsi_Host *shost = transport_class_to_shost(cdev); |
|
|
|
return sprintf(buf, "%s\n", shost->max_id == 16 ? "wide" : "narrow"); |
|
} |
|
static DEVICE_ATTR(host_width, S_IRUGO, |
|
show_spi_host_width, NULL); |
|
|
|
static ssize_t show_spi_host_hba_id(struct device *cdev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct Scsi_Host *shost = transport_class_to_shost(cdev); |
|
|
|
return sprintf(buf, "%d\n", shost->this_id); |
|
} |
|
static DEVICE_ATTR(hba_id, S_IRUGO, |
|
show_spi_host_hba_id, NULL); |
|
|
|
#define DV_SET(x, y) \ |
|
if(i->f->set_##x) \ |
|
i->f->set_##x(sdev->sdev_target, y) |
|
|
|
enum spi_compare_returns { |
|
SPI_COMPARE_SUCCESS, |
|
SPI_COMPARE_FAILURE, |
|
SPI_COMPARE_SKIP_TEST, |
|
}; |
|
|
|
|
|
/* This is for read/write Domain Validation: If the device supports |
|
* an echo buffer, we do read/write tests to it */ |
|
static enum spi_compare_returns |
|
spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer, |
|
u8 *ptr, const int retries) |
|
{ |
|
int len = ptr - buffer; |
|
int j, k, r, result; |
|
unsigned int pattern = 0x0000ffff; |
|
struct scsi_sense_hdr sshdr; |
|
|
|
const char spi_write_buffer[] = { |
|
WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 |
|
}; |
|
const char spi_read_buffer[] = { |
|
READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 |
|
}; |
|
|
|
/* set up the pattern buffer. Doesn't matter if we spill |
|
* slightly beyond since that's where the read buffer is */ |
|
for (j = 0; j < len; ) { |
|
|
|
/* fill the buffer with counting (test a) */ |
|
for ( ; j < min(len, 32); j++) |
|
buffer[j] = j; |
|
k = j; |
|
/* fill the buffer with alternating words of 0x0 and |
|
* 0xffff (test b) */ |
|
for ( ; j < min(len, k + 32); j += 2) { |
|
u16 *word = (u16 *)&buffer[j]; |
|
|
|
*word = (j & 0x02) ? 0x0000 : 0xffff; |
|
} |
|
k = j; |
|
/* fill with crosstalk (alternating 0x5555 0xaaa) |
|
* (test c) */ |
|
for ( ; j < min(len, k + 32); j += 2) { |
|
u16 *word = (u16 *)&buffer[j]; |
|
|
|
*word = (j & 0x02) ? 0x5555 : 0xaaaa; |
|
} |
|
k = j; |
|
/* fill with shifting bits (test d) */ |
|
for ( ; j < min(len, k + 32); j += 4) { |
|
u32 *word = (unsigned int *)&buffer[j]; |
|
u32 roll = (pattern & 0x80000000) ? 1 : 0; |
|
|
|
*word = pattern; |
|
pattern = (pattern << 1) | roll; |
|
} |
|
/* don't bother with random data (test e) */ |
|
} |
|
|
|
for (r = 0; r < retries; r++) { |
|
result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE, |
|
buffer, len, &sshdr); |
|
if(result || !scsi_device_online(sdev)) { |
|
|
|
scsi_device_set_state(sdev, SDEV_QUIESCE); |
|
if (scsi_sense_valid(&sshdr) |
|
&& sshdr.sense_key == ILLEGAL_REQUEST |
|
/* INVALID FIELD IN CDB */ |
|
&& sshdr.asc == 0x24 && sshdr.ascq == 0x00) |
|
/* This would mean that the drive lied |
|
* to us about supporting an echo |
|
* buffer (unfortunately some Western |
|
* Digital drives do precisely this) |
|
*/ |
|
return SPI_COMPARE_SKIP_TEST; |
|
|
|
|
|
sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result); |
|
return SPI_COMPARE_FAILURE; |
|
} |
|
|
|
memset(ptr, 0, len); |
|
spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE, |
|
ptr, len, NULL); |
|
scsi_device_set_state(sdev, SDEV_QUIESCE); |
|
|
|
if (memcmp(buffer, ptr, len) != 0) |
|
return SPI_COMPARE_FAILURE; |
|
} |
|
return SPI_COMPARE_SUCCESS; |
|
} |
|
|
|
/* This is for the simplest form of Domain Validation: a read test |
|
* on the inquiry data from the device */ |
|
static enum spi_compare_returns |
|
spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer, |
|
u8 *ptr, const int retries) |
|
{ |
|
int r, result; |
|
const int len = sdev->inquiry_len; |
|
const char spi_inquiry[] = { |
|
INQUIRY, 0, 0, 0, len, 0 |
|
}; |
|
|
|
for (r = 0; r < retries; r++) { |
|
memset(ptr, 0, len); |
|
|
|
result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE, |
|
ptr, len, NULL); |
|
|
|
if(result || !scsi_device_online(sdev)) { |
|
scsi_device_set_state(sdev, SDEV_QUIESCE); |
|
return SPI_COMPARE_FAILURE; |
|
} |
|
|
|
/* If we don't have the inquiry data already, the |
|
* first read gets it */ |
|
if (ptr == buffer) { |
|
ptr += len; |
|
--r; |
|
continue; |
|
} |
|
|
|
if (memcmp(buffer, ptr, len) != 0) |
|
/* failure */ |
|
return SPI_COMPARE_FAILURE; |
|
} |
|
return SPI_COMPARE_SUCCESS; |
|
} |
|
|
|
static enum spi_compare_returns |
|
spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr, |
|
enum spi_compare_returns |
|
(*compare_fn)(struct scsi_device *, u8 *, u8 *, int)) |
|
{ |
|
struct spi_internal *i = to_spi_internal(sdev->host->transportt); |
|
struct scsi_target *starget = sdev->sdev_target; |
|
int period = 0, prevperiod = 0; |
|
enum spi_compare_returns retval; |
|
|
|
|
|
for (;;) { |
|
int newperiod; |
|
retval = compare_fn(sdev, buffer, ptr, DV_LOOPS); |
|
|
|
if (retval == SPI_COMPARE_SUCCESS |
|
|| retval == SPI_COMPARE_SKIP_TEST) |
|
break; |
|
|
|
/* OK, retrain, fallback */ |
|
if (i->f->get_iu) |
|
i->f->get_iu(starget); |
|
if (i->f->get_qas) |
|
i->f->get_qas(starget); |
|
if (i->f->get_period) |
|
i->f->get_period(sdev->sdev_target); |
|
|
|
/* Here's the fallback sequence; first try turning off |
|
* IU, then QAS (if we can control them), then finally |
|
* fall down the periods */ |
|
if (i->f->set_iu && spi_iu(starget)) { |
|
starget_printk(KERN_ERR, starget, "Domain Validation Disabling Information Units\n"); |
|
DV_SET(iu, 0); |
|
} else if (i->f->set_qas && spi_qas(starget)) { |
|
starget_printk(KERN_ERR, starget, "Domain Validation Disabling Quick Arbitration and Selection\n"); |
|
DV_SET(qas, 0); |
|
} else { |
|
newperiod = spi_period(starget); |
|
period = newperiod > period ? newperiod : period; |
|
if (period < 0x0d) |
|
period++; |
|
else |
|
period += period >> 1; |
|
|
|
if (unlikely(period > 0xff || period == prevperiod)) { |
|
/* Total failure; set to async and return */ |
|
starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n"); |
|
DV_SET(offset, 0); |
|
return SPI_COMPARE_FAILURE; |
|
} |
|
starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n"); |
|
DV_SET(period, period); |
|
prevperiod = period; |
|
} |
|
} |
|
return retval; |
|
} |
|
|
|
static int |
|
spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer) |
|
{ |
|
int l, result; |
|
|
|
/* first off do a test unit ready. This can error out |
|
* because of reservations or some other reason. If it |
|
* fails, the device won't let us write to the echo buffer |
|
* so just return failure */ |
|
|
|
static const char spi_test_unit_ready[] = { |
|
TEST_UNIT_READY, 0, 0, 0, 0, 0 |
|
}; |
|
|
|
static const char spi_read_buffer_descriptor[] = { |
|
READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0 |
|
}; |
|
|
|
|
|
/* We send a set of three TURs to clear any outstanding |
|
* unit attention conditions if they exist (Otherwise the |
|
* buffer tests won't be happy). If the TUR still fails |
|
* (reservation conflict, device not ready, etc) just |
|
* skip the write tests */ |
|
for (l = 0; ; l++) { |
|
result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, |
|
NULL, 0, NULL); |
|
|
|
if(result) { |
|
if(l >= 3) |
|
return 0; |
|
} else { |
|
/* TUR succeeded */ |
|
break; |
|
} |
|
} |
|
|
|
result = spi_execute(sdev, spi_read_buffer_descriptor, |
|
DMA_FROM_DEVICE, buffer, 4, NULL); |
|
|
|
if (result) |
|
/* Device has no echo buffer */ |
|
return 0; |
|
|
|
return buffer[3] + ((buffer[2] & 0x1f) << 8); |
|
} |
|
|
|
static void |
|
spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer) |
|
{ |
|
struct spi_internal *i = to_spi_internal(sdev->host->transportt); |
|
struct scsi_target *starget = sdev->sdev_target; |
|
struct Scsi_Host *shost = sdev->host; |
|
int len = sdev->inquiry_len; |
|
int min_period = spi_min_period(starget); |
|
int max_width = spi_max_width(starget); |
|
/* first set us up for narrow async */ |
|
DV_SET(offset, 0); |
|
DV_SET(width, 0); |
|
|
|
if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS) |
|
!= SPI_COMPARE_SUCCESS) { |
|
starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n"); |
|
/* FIXME: should probably offline the device here? */ |
|
return; |
|
} |
|
|
|
if (!spi_support_wide(starget)) { |
|
spi_max_width(starget) = 0; |
|
max_width = 0; |
|
} |
|
|
|
/* test width */ |
|
if (i->f->set_width && max_width) { |
|
i->f->set_width(starget, 1); |
|
|
|
if (spi_dv_device_compare_inquiry(sdev, buffer, |
|
buffer + len, |
|
DV_LOOPS) |
|
!= SPI_COMPARE_SUCCESS) { |
|
starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n"); |
|
i->f->set_width(starget, 0); |
|
/* Make sure we don't force wide back on by asking |
|
* for a transfer period that requires it */ |
|
max_width = 0; |
|
if (min_period < 10) |
|
min_period = 10; |
|
} |
|
} |
|
|
|
if (!i->f->set_period) |
|
return; |
|
|
|
/* device can't handle synchronous */ |
|
if (!spi_support_sync(starget) && !spi_support_dt(starget)) |
|
return; |
|
|
|
/* len == -1 is the signal that we need to ascertain the |
|
* presence of an echo buffer before trying to use it. len == |
|
* 0 means we don't have an echo buffer */ |
|
len = -1; |
|
|
|
retry: |
|
|
|
/* now set up to the maximum */ |
|
DV_SET(offset, spi_max_offset(starget)); |
|
DV_SET(period, min_period); |
|
|
|
/* try QAS requests; this should be harmless to set if the |
|
* target supports it */ |
|
if (spi_support_qas(starget) && spi_max_qas(starget)) { |
|
DV_SET(qas, 1); |
|
} else { |
|
DV_SET(qas, 0); |
|
} |
|
|
|
if (spi_support_ius(starget) && spi_max_iu(starget) && |
|
min_period < 9) { |
|
/* This u320 (or u640). Set IU transfers */ |
|
DV_SET(iu, 1); |
|
/* Then set the optional parameters */ |
|
DV_SET(rd_strm, 1); |
|
DV_SET(wr_flow, 1); |
|
DV_SET(rti, 1); |
|
if (min_period == 8) |
|
DV_SET(pcomp_en, 1); |
|
} else { |
|
DV_SET(iu, 0); |
|
} |
|
|
|
/* now that we've done all this, actually check the bus |
|
* signal type (if known). Some devices are stupid on |
|
* a SE bus and still claim they can try LVD only settings */ |
|
if (i->f->get_signalling) |
|
i->f->get_signalling(shost); |
|
if (spi_signalling(shost) == SPI_SIGNAL_SE || |
|
spi_signalling(shost) == SPI_SIGNAL_HVD || |
|
!spi_support_dt(starget)) { |
|
DV_SET(dt, 0); |
|
} else { |
|
DV_SET(dt, 1); |
|
} |
|
/* set width last because it will pull all the other |
|
* parameters down to required values */ |
|
DV_SET(width, max_width); |
|
|
|
/* Do the read only INQUIRY tests */ |
|
spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len, |
|
spi_dv_device_compare_inquiry); |
|
/* See if we actually managed to negotiate and sustain DT */ |
|
if (i->f->get_dt) |
|
i->f->get_dt(starget); |
|
|
|
/* see if the device has an echo buffer. If it does we can do |
|
* the SPI pattern write tests. Because of some broken |
|
* devices, we *only* try this on a device that has actually |
|
* negotiated DT */ |
|
|
|
if (len == -1 && spi_dt(starget)) |
|
len = spi_dv_device_get_echo_buffer(sdev, buffer); |
|
|
|
if (len <= 0) { |
|
starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n"); |
|
return; |
|
} |
|
|
|
if (len > SPI_MAX_ECHO_BUFFER_SIZE) { |
|
starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE); |
|
len = SPI_MAX_ECHO_BUFFER_SIZE; |
|
} |
|
|
|
if (spi_dv_retrain(sdev, buffer, buffer + len, |
|
spi_dv_device_echo_buffer) |
|
== SPI_COMPARE_SKIP_TEST) { |
|
/* OK, the stupid drive can't do a write echo buffer |
|
* test after all, fall back to the read tests */ |
|
len = 0; |
|
goto retry; |
|
} |
|
} |
|
|
|
|
|
/** spi_dv_device - Do Domain Validation on the device |
|
* @sdev: scsi device to validate |
|
* |
|
* Performs the domain validation on the given device in the |
|
* current execution thread. Since DV operations may sleep, |
|
* the current thread must have user context. Also no SCSI |
|
* related locks that would deadlock I/O issued by the DV may |
|
* be held. |
|
*/ |
|
void |
|
spi_dv_device(struct scsi_device *sdev) |
|
{ |
|
struct scsi_target *starget = sdev->sdev_target; |
|
u8 *buffer; |
|
const int len = SPI_MAX_ECHO_BUFFER_SIZE*2; |
|
|
|
/* |
|
* Because this function and the power management code both call |
|
* scsi_device_quiesce(), it is not safe to perform domain validation |
|
* while suspend or resume is in progress. Hence the |
|
* lock/unlock_system_sleep() calls. |
|
*/ |
|
lock_system_sleep(); |
|
|
|
if (scsi_autopm_get_device(sdev)) |
|
goto unlock_system_sleep; |
|
|
|
if (unlikely(spi_dv_in_progress(starget))) |
|
goto put_autopm; |
|
|
|
if (unlikely(scsi_device_get(sdev))) |
|
goto put_autopm; |
|
|
|
spi_dv_in_progress(starget) = 1; |
|
|
|
buffer = kzalloc(len, GFP_KERNEL); |
|
|
|
if (unlikely(!buffer)) |
|
goto put_sdev; |
|
|
|
/* We need to verify that the actual device will quiesce; the |
|
* later target quiesce is just a nice to have */ |
|
if (unlikely(scsi_device_quiesce(sdev))) |
|
goto free_buffer; |
|
|
|
scsi_target_quiesce(starget); |
|
|
|
spi_dv_pending(starget) = 1; |
|
mutex_lock(&spi_dv_mutex(starget)); |
|
|
|
starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n"); |
|
|
|
spi_dv_device_internal(sdev, buffer); |
|
|
|
starget_printk(KERN_INFO, starget, "Ending Domain Validation\n"); |
|
|
|
mutex_unlock(&spi_dv_mutex(starget)); |
|
spi_dv_pending(starget) = 0; |
|
|
|
scsi_target_resume(starget); |
|
|
|
spi_initial_dv(starget) = 1; |
|
|
|
free_buffer: |
|
kfree(buffer); |
|
|
|
put_sdev: |
|
spi_dv_in_progress(starget) = 0; |
|
scsi_device_put(sdev); |
|
put_autopm: |
|
scsi_autopm_put_device(sdev); |
|
|
|
unlock_system_sleep: |
|
unlock_system_sleep(); |
|
} |
|
EXPORT_SYMBOL(spi_dv_device); |
|
|
|
struct work_queue_wrapper { |
|
struct work_struct work; |
|
struct scsi_device *sdev; |
|
}; |
|
|
|
static void |
|
spi_dv_device_work_wrapper(struct work_struct *work) |
|
{ |
|
struct work_queue_wrapper *wqw = |
|
container_of(work, struct work_queue_wrapper, work); |
|
struct scsi_device *sdev = wqw->sdev; |
|
|
|
kfree(wqw); |
|
spi_dv_device(sdev); |
|
spi_dv_pending(sdev->sdev_target) = 0; |
|
scsi_device_put(sdev); |
|
} |
|
|
|
|
|
/** |
|
* spi_schedule_dv_device - schedule domain validation to occur on the device |
|
* @sdev: The device to validate |
|
* |
|
* Identical to spi_dv_device() above, except that the DV will be |
|
* scheduled to occur in a workqueue later. All memory allocations |
|
* are atomic, so may be called from any context including those holding |
|
* SCSI locks. |
|
*/ |
|
void |
|
spi_schedule_dv_device(struct scsi_device *sdev) |
|
{ |
|
struct work_queue_wrapper *wqw = |
|
kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC); |
|
|
|
if (unlikely(!wqw)) |
|
return; |
|
|
|
if (unlikely(spi_dv_pending(sdev->sdev_target))) { |
|
kfree(wqw); |
|
return; |
|
} |
|
/* Set pending early (dv_device doesn't check it, only sets it) */ |
|
spi_dv_pending(sdev->sdev_target) = 1; |
|
if (unlikely(scsi_device_get(sdev))) { |
|
kfree(wqw); |
|
spi_dv_pending(sdev->sdev_target) = 0; |
|
return; |
|
} |
|
|
|
INIT_WORK(&wqw->work, spi_dv_device_work_wrapper); |
|
wqw->sdev = sdev; |
|
|
|
schedule_work(&wqw->work); |
|
} |
|
EXPORT_SYMBOL(spi_schedule_dv_device); |
|
|
|
/** |
|
* spi_display_xfer_agreement - Print the current target transfer agreement |
|
* @starget: The target for which to display the agreement |
|
* |
|
* Each SPI port is required to maintain a transfer agreement for each |
|
* other port on the bus. This function prints a one-line summary of |
|
* the current agreement; more detailed information is available in sysfs. |
|
*/ |
|
void spi_display_xfer_agreement(struct scsi_target *starget) |
|
{ |
|
struct spi_transport_attrs *tp; |
|
tp = (struct spi_transport_attrs *)&starget->starget_data; |
|
|
|
if (tp->offset > 0 && tp->period > 0) { |
|
unsigned int picosec, kb100; |
|
char *scsi = "FAST-?"; |
|
char tmp[8]; |
|
|
|
if (tp->period <= SPI_STATIC_PPR) { |
|
picosec = ppr_to_ps[tp->period]; |
|
switch (tp->period) { |
|
case 7: scsi = "FAST-320"; break; |
|
case 8: scsi = "FAST-160"; break; |
|
case 9: scsi = "FAST-80"; break; |
|
case 10: |
|
case 11: scsi = "FAST-40"; break; |
|
case 12: scsi = "FAST-20"; break; |
|
} |
|
} else { |
|
picosec = tp->period * 4000; |
|
if (tp->period < 25) |
|
scsi = "FAST-20"; |
|
else if (tp->period < 50) |
|
scsi = "FAST-10"; |
|
else |
|
scsi = "FAST-5"; |
|
} |
|
|
|
kb100 = (10000000 + picosec / 2) / picosec; |
|
if (tp->width) |
|
kb100 *= 2; |
|
sprint_frac(tmp, picosec, 1000); |
|
|
|
dev_info(&starget->dev, |
|
"%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n", |
|
scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10, |
|
tp->dt ? "DT" : "ST", |
|
tp->iu ? " IU" : "", |
|
tp->qas ? " QAS" : "", |
|
tp->rd_strm ? " RDSTRM" : "", |
|
tp->rti ? " RTI" : "", |
|
tp->wr_flow ? " WRFLOW" : "", |
|
tp->pcomp_en ? " PCOMP" : "", |
|
tp->hold_mcs ? " HMCS" : "", |
|
tmp, tp->offset); |
|
} else { |
|
dev_info(&starget->dev, "%sasynchronous\n", |
|
tp->width ? "wide " : ""); |
|
} |
|
} |
|
EXPORT_SYMBOL(spi_display_xfer_agreement); |
|
|
|
int spi_populate_width_msg(unsigned char *msg, int width) |
|
{ |
|
msg[0] = EXTENDED_MESSAGE; |
|
msg[1] = 2; |
|
msg[2] = EXTENDED_WDTR; |
|
msg[3] = width; |
|
return 4; |
|
} |
|
EXPORT_SYMBOL_GPL(spi_populate_width_msg); |
|
|
|
int spi_populate_sync_msg(unsigned char *msg, int period, int offset) |
|
{ |
|
msg[0] = EXTENDED_MESSAGE; |
|
msg[1] = 3; |
|
msg[2] = EXTENDED_SDTR; |
|
msg[3] = period; |
|
msg[4] = offset; |
|
return 5; |
|
} |
|
EXPORT_SYMBOL_GPL(spi_populate_sync_msg); |
|
|
|
int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, |
|
int width, int options) |
|
{ |
|
msg[0] = EXTENDED_MESSAGE; |
|
msg[1] = 6; |
|
msg[2] = EXTENDED_PPR; |
|
msg[3] = period; |
|
msg[4] = 0; |
|
msg[5] = offset; |
|
msg[6] = width; |
|
msg[7] = options; |
|
return 8; |
|
} |
|
EXPORT_SYMBOL_GPL(spi_populate_ppr_msg); |
|
|
|
/** |
|
* spi_populate_tag_msg - place a tag message in a buffer |
|
* @msg: pointer to the area to place the tag |
|
* @cmd: pointer to the scsi command for the tag |
|
* |
|
* Notes: |
|
* designed to create the correct type of tag message for the |
|
* particular request. Returns the size of the tag message. |
|
* May return 0 if TCQ is disabled for this device. |
|
**/ |
|
int spi_populate_tag_msg(unsigned char *msg, struct scsi_cmnd *cmd) |
|
{ |
|
if (cmd->flags & SCMD_TAGGED) { |
|
*msg++ = SIMPLE_QUEUE_TAG; |
|
*msg++ = scsi_cmd_to_rq(cmd)->tag; |
|
return 2; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(spi_populate_tag_msg); |
|
|
|
#ifdef CONFIG_SCSI_CONSTANTS |
|
static const char * const one_byte_msgs[] = { |
|
/* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers", |
|
/* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", |
|
/* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error", |
|
/* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag", |
|
/* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", |
|
/* 0x0f */ "Initiate Recovery", "Release Recovery", |
|
/* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable", |
|
/* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset" |
|
}; |
|
|
|
static const char * const two_byte_msgs[] = { |
|
/* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag", |
|
/* 0x23 */ "Ignore Wide Residue", "ACA" |
|
}; |
|
|
|
static const char * const extended_msgs[] = { |
|
/* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request", |
|
/* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request", |
|
/* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer" |
|
}; |
|
|
|
static void print_nego(const unsigned char *msg, int per, int off, int width) |
|
{ |
|
if (per) { |
|
char buf[20]; |
|
period_to_str(buf, msg[per]); |
|
printk("period = %s ns ", buf); |
|
} |
|
|
|
if (off) |
|
printk("offset = %d ", msg[off]); |
|
if (width) |
|
printk("width = %d ", 8 << msg[width]); |
|
} |
|
|
|
static void print_ptr(const unsigned char *msg, int msb, const char *desc) |
|
{ |
|
int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) | |
|
msg[msb+3]; |
|
printk("%s = %d ", desc, ptr); |
|
} |
|
|
|
int spi_print_msg(const unsigned char *msg) |
|
{ |
|
int len = 1, i; |
|
if (msg[0] == EXTENDED_MESSAGE) { |
|
len = 2 + msg[1]; |
|
if (len == 2) |
|
len += 256; |
|
if (msg[2] < ARRAY_SIZE(extended_msgs)) |
|
printk ("%s ", extended_msgs[msg[2]]); |
|
else |
|
printk ("Extended Message, reserved code (0x%02x) ", |
|
(int) msg[2]); |
|
switch (msg[2]) { |
|
case EXTENDED_MODIFY_DATA_POINTER: |
|
print_ptr(msg, 3, "pointer"); |
|
break; |
|
case EXTENDED_SDTR: |
|
print_nego(msg, 3, 4, 0); |
|
break; |
|
case EXTENDED_WDTR: |
|
print_nego(msg, 0, 0, 3); |
|
break; |
|
case EXTENDED_PPR: |
|
print_nego(msg, 3, 5, 6); |
|
break; |
|
case EXTENDED_MODIFY_BIDI_DATA_PTR: |
|
print_ptr(msg, 3, "out"); |
|
print_ptr(msg, 7, "in"); |
|
break; |
|
default: |
|
for (i = 2; i < len; ++i) |
|
printk("%02x ", msg[i]); |
|
} |
|
/* Identify */ |
|
} else if (msg[0] & 0x80) { |
|
printk("Identify disconnect %sallowed %s %d ", |
|
(msg[0] & 0x40) ? "" : "not ", |
|
(msg[0] & 0x20) ? "target routine" : "lun", |
|
msg[0] & 0x7); |
|
/* Normal One byte */ |
|
} else if (msg[0] < 0x1f) { |
|
if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]]) |
|
printk("%s ", one_byte_msgs[msg[0]]); |
|
else |
|
printk("reserved (%02x) ", msg[0]); |
|
} else if (msg[0] == 0x55) { |
|
printk("QAS Request "); |
|
/* Two byte */ |
|
} else if (msg[0] <= 0x2f) { |
|
if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs)) |
|
printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], |
|
msg[1]); |
|
else |
|
printk("reserved two byte (%02x %02x) ", |
|
msg[0], msg[1]); |
|
len = 2; |
|
} else |
|
printk("reserved "); |
|
return len; |
|
} |
|
EXPORT_SYMBOL(spi_print_msg); |
|
|
|
#else /* ifndef CONFIG_SCSI_CONSTANTS */ |
|
|
|
int spi_print_msg(const unsigned char *msg) |
|
{ |
|
int len = 1, i; |
|
|
|
if (msg[0] == EXTENDED_MESSAGE) { |
|
len = 2 + msg[1]; |
|
if (len == 2) |
|
len += 256; |
|
for (i = 0; i < len; ++i) |
|
printk("%02x ", msg[i]); |
|
/* Identify */ |
|
} else if (msg[0] & 0x80) { |
|
printk("%02x ", msg[0]); |
|
/* Normal One byte */ |
|
} else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) { |
|
printk("%02x ", msg[0]); |
|
/* Two byte */ |
|
} else if (msg[0] <= 0x2f) { |
|
printk("%02x %02x", msg[0], msg[1]); |
|
len = 2; |
|
} else |
|
printk("%02x ", msg[0]); |
|
return len; |
|
} |
|
EXPORT_SYMBOL(spi_print_msg); |
|
#endif /* ! CONFIG_SCSI_CONSTANTS */ |
|
|
|
static int spi_device_match(struct attribute_container *cont, |
|
struct device *dev) |
|
{ |
|
struct scsi_device *sdev; |
|
struct Scsi_Host *shost; |
|
struct spi_internal *i; |
|
|
|
if (!scsi_is_sdev_device(dev)) |
|
return 0; |
|
|
|
sdev = to_scsi_device(dev); |
|
shost = sdev->host; |
|
if (!shost->transportt || shost->transportt->host_attrs.ac.class |
|
!= &spi_host_class.class) |
|
return 0; |
|
/* Note: this class has no device attributes, so it has |
|
* no per-HBA allocation and thus we don't need to distinguish |
|
* the attribute containers for the device */ |
|
i = to_spi_internal(shost->transportt); |
|
if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target)) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
static int spi_target_match(struct attribute_container *cont, |
|
struct device *dev) |
|
{ |
|
struct Scsi_Host *shost; |
|
struct scsi_target *starget; |
|
struct spi_internal *i; |
|
|
|
if (!scsi_is_target_device(dev)) |
|
return 0; |
|
|
|
shost = dev_to_shost(dev->parent); |
|
if (!shost->transportt || shost->transportt->host_attrs.ac.class |
|
!= &spi_host_class.class) |
|
return 0; |
|
|
|
i = to_spi_internal(shost->transportt); |
|
starget = to_scsi_target(dev); |
|
|
|
if (i->f->deny_binding && i->f->deny_binding(starget)) |
|
return 0; |
|
|
|
return &i->t.target_attrs.ac == cont; |
|
} |
|
|
|
static DECLARE_TRANSPORT_CLASS(spi_transport_class, |
|
"spi_transport", |
|
spi_setup_transport_attrs, |
|
NULL, |
|
spi_target_configure); |
|
|
|
static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class, |
|
spi_device_match, |
|
spi_device_configure); |
|
|
|
static struct attribute *host_attributes[] = { |
|
&dev_attr_signalling.attr, |
|
&dev_attr_host_width.attr, |
|
&dev_attr_hba_id.attr, |
|
NULL |
|
}; |
|
|
|
static struct attribute_group host_attribute_group = { |
|
.attrs = host_attributes, |
|
}; |
|
|
|
static int spi_host_configure(struct transport_container *tc, |
|
struct device *dev, |
|
struct device *cdev) |
|
{ |
|
struct kobject *kobj = &cdev->kobj; |
|
struct Scsi_Host *shost = transport_class_to_shost(cdev); |
|
struct spi_internal *si = to_spi_internal(shost->transportt); |
|
struct attribute *attr = &dev_attr_signalling.attr; |
|
int rc = 0; |
|
|
|
if (si->f->set_signalling) |
|
rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR); |
|
|
|
return rc; |
|
} |
|
|
|
/* returns true if we should be showing the variable. Also |
|
* overloads the return by setting 1<<1 if the attribute should |
|
* be writeable */ |
|
#define TARGET_ATTRIBUTE_HELPER(name) \ |
|
(si->f->show_##name ? S_IRUGO : 0) | \ |
|
(si->f->set_##name ? S_IWUSR : 0) |
|
|
|
static umode_t target_attribute_is_visible(struct kobject *kobj, |
|
struct attribute *attr, int i) |
|
{ |
|
struct device *cdev = container_of(kobj, struct device, kobj); |
|
struct scsi_target *starget = transport_class_to_starget(cdev); |
|
struct Scsi_Host *shost = transport_class_to_shost(cdev); |
|
struct spi_internal *si = to_spi_internal(shost->transportt); |
|
|
|
if (attr == &dev_attr_period.attr && |
|
spi_support_sync(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(period); |
|
else if (attr == &dev_attr_min_period.attr && |
|
spi_support_sync(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(period); |
|
else if (attr == &dev_attr_offset.attr && |
|
spi_support_sync(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(offset); |
|
else if (attr == &dev_attr_max_offset.attr && |
|
spi_support_sync(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(offset); |
|
else if (attr == &dev_attr_width.attr && |
|
spi_support_wide(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(width); |
|
else if (attr == &dev_attr_max_width.attr && |
|
spi_support_wide(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(width); |
|
else if (attr == &dev_attr_iu.attr && |
|
spi_support_ius(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(iu); |
|
else if (attr == &dev_attr_max_iu.attr && |
|
spi_support_ius(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(iu); |
|
else if (attr == &dev_attr_dt.attr && |
|
spi_support_dt(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(dt); |
|
else if (attr == &dev_attr_qas.attr && |
|
spi_support_qas(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(qas); |
|
else if (attr == &dev_attr_max_qas.attr && |
|
spi_support_qas(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(qas); |
|
else if (attr == &dev_attr_wr_flow.attr && |
|
spi_support_ius(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(wr_flow); |
|
else if (attr == &dev_attr_rd_strm.attr && |
|
spi_support_ius(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(rd_strm); |
|
else if (attr == &dev_attr_rti.attr && |
|
spi_support_ius(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(rti); |
|
else if (attr == &dev_attr_pcomp_en.attr && |
|
spi_support_ius(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(pcomp_en); |
|
else if (attr == &dev_attr_hold_mcs.attr && |
|
spi_support_ius(starget)) |
|
return TARGET_ATTRIBUTE_HELPER(hold_mcs); |
|
else if (attr == &dev_attr_revalidate.attr) |
|
return S_IWUSR; |
|
|
|
return 0; |
|
} |
|
|
|
static struct attribute *target_attributes[] = { |
|
&dev_attr_period.attr, |
|
&dev_attr_min_period.attr, |
|
&dev_attr_offset.attr, |
|
&dev_attr_max_offset.attr, |
|
&dev_attr_width.attr, |
|
&dev_attr_max_width.attr, |
|
&dev_attr_iu.attr, |
|
&dev_attr_max_iu.attr, |
|
&dev_attr_dt.attr, |
|
&dev_attr_qas.attr, |
|
&dev_attr_max_qas.attr, |
|
&dev_attr_wr_flow.attr, |
|
&dev_attr_rd_strm.attr, |
|
&dev_attr_rti.attr, |
|
&dev_attr_pcomp_en.attr, |
|
&dev_attr_hold_mcs.attr, |
|
&dev_attr_revalidate.attr, |
|
NULL |
|
}; |
|
|
|
static struct attribute_group target_attribute_group = { |
|
.attrs = target_attributes, |
|
.is_visible = target_attribute_is_visible, |
|
}; |
|
|
|
static int spi_target_configure(struct transport_container *tc, |
|
struct device *dev, |
|
struct device *cdev) |
|
{ |
|
struct kobject *kobj = &cdev->kobj; |
|
|
|
/* force an update based on parameters read from the device */ |
|
sysfs_update_group(kobj, &target_attribute_group); |
|
|
|
return 0; |
|
} |
|
|
|
struct scsi_transport_template * |
|
spi_attach_transport(struct spi_function_template *ft) |
|
{ |
|
struct spi_internal *i = kzalloc(sizeof(struct spi_internal), |
|
GFP_KERNEL); |
|
|
|
if (unlikely(!i)) |
|
return NULL; |
|
|
|
i->t.target_attrs.ac.class = &spi_transport_class.class; |
|
i->t.target_attrs.ac.grp = &target_attribute_group; |
|
i->t.target_attrs.ac.match = spi_target_match; |
|
transport_container_register(&i->t.target_attrs); |
|
i->t.target_size = sizeof(struct spi_transport_attrs); |
|
i->t.host_attrs.ac.class = &spi_host_class.class; |
|
i->t.host_attrs.ac.grp = &host_attribute_group; |
|
i->t.host_attrs.ac.match = spi_host_match; |
|
transport_container_register(&i->t.host_attrs); |
|
i->t.host_size = sizeof(struct spi_host_attrs); |
|
i->f = ft; |
|
|
|
return &i->t; |
|
} |
|
EXPORT_SYMBOL(spi_attach_transport); |
|
|
|
void spi_release_transport(struct scsi_transport_template *t) |
|
{ |
|
struct spi_internal *i = to_spi_internal(t); |
|
|
|
transport_container_unregister(&i->t.target_attrs); |
|
transport_container_unregister(&i->t.host_attrs); |
|
|
|
kfree(i); |
|
} |
|
EXPORT_SYMBOL(spi_release_transport); |
|
|
|
static __init int spi_transport_init(void) |
|
{ |
|
int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI, |
|
"SCSI Parallel Transport Class"); |
|
if (!error) { |
|
int i; |
|
|
|
for (i = 0; spi_static_device_list[i].vendor; i++) |
|
scsi_dev_info_list_add_keyed(1, /* compatible */ |
|
spi_static_device_list[i].vendor, |
|
spi_static_device_list[i].model, |
|
NULL, |
|
spi_static_device_list[i].flags, |
|
SCSI_DEVINFO_SPI); |
|
} |
|
|
|
error = transport_class_register(&spi_transport_class); |
|
if (error) |
|
return error; |
|
error = anon_transport_class_register(&spi_device_class); |
|
return transport_class_register(&spi_host_class); |
|
} |
|
|
|
static void __exit spi_transport_exit(void) |
|
{ |
|
transport_class_unregister(&spi_transport_class); |
|
anon_transport_class_unregister(&spi_device_class); |
|
transport_class_unregister(&spi_host_class); |
|
scsi_dev_info_remove_list(SCSI_DEVINFO_SPI); |
|
} |
|
|
|
MODULE_AUTHOR("Martin Hicks"); |
|
MODULE_DESCRIPTION("SPI Transport Attributes"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
module_init(spi_transport_init); |
|
module_exit(spi_transport_exit);
|
|
|