diff options
| author | Hannes Reinecke <hare@suse.de> | 2014-11-24 17:37:27 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2014-11-24 18:13:16 +0300 |
| commit | eeea2f9c2f2ecc5f3217edcacc95817047b143c2 (patch) | |
| tree | 30ae59b8af6754aca843d83a334f040459f1a031 /drivers/scsi/esp_scsi.c | |
| parent | 6df388f2d549d3a2a7ad58b632d2ecd25fc0ff3f (diff) | |
| download | linux-eeea2f9c2f2ecc5f3217edcacc95817047b143c2.tar.xz | |
esp_scsi: correctly detect am53c974
The am53c974 returns the same ID as the FAS236, but implements
things slightly differently. So detect the am53c974 by checking
for ESP_CONFIG4 register.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/esp_scsi.c')
| -rw-r--r-- | drivers/scsi/esp_scsi.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c index 4366011cd400..3fb6a00934bc 100644 --- a/drivers/scsi/esp_scsi.c +++ b/drivers/scsi/esp_scsi.c @@ -268,6 +268,19 @@ static void esp_reset_esp(struct esp *esp) } else { esp->min_period = ((5 * esp->ccycle) / 1000); } + if (esp->rev == FAS236) { + /* + * The AM53c974 chip returns the same ID as FAS236; + * try to configure glitch eater. + */ + u8 config4 = ESP_CONFIG4_GE1; + esp_write8(config4, ESP_CFG4); + config4 = esp_read8(ESP_CFG4); + if (config4 & ESP_CONFIG4_GE1) { + esp->rev = PCSCSI; + esp_write8(esp->config4, ESP_CFG4); + } + } esp->max_period = (esp->max_period + 3)>>2; esp->min_period = (esp->min_period + 3)>>2; @@ -293,7 +306,8 @@ static void esp_reset_esp(struct esp *esp) /* fallthrough... */ case FAS236: - /* Fast 236 or HME */ + case PCSCSI: + /* Fast 236, AM53c974 or HME */ esp_write8(esp->config2, ESP_CFG2); if (esp->rev == FASHME) { u8 cfg3 = esp->target[0].esp_config3; @@ -2364,6 +2378,7 @@ static const char *esp_chip_names[] = { "FAS100A", "FAST", "FASHME", + "AM53C974", }; static struct scsi_transport_template *esp_transport_template; |