Add support for the Atari ST DMA chip to the NCR5380.c core driver. This code is copied from atari_NCR5380.c. Signed-off-by: Finn Thain Reviewed-by: Hannes Reinecke Tested-by: Michael Schmitz Tested-by: Ondrej Zary --- drivers/scsi/NCR5380.c | 32 ++++++++++++++++++++++++++++++++ drivers/scsi/atari_scsi.c | 6 +++--- 2 files changed, 35 insertions(+), 3 deletions(-) Index: linux/drivers/scsi/NCR5380.c =================================================================== --- linux.orig/drivers/scsi/NCR5380.c 2016-03-23 21:09:47.000000000 +1100 +++ linux/drivers/scsi/NCR5380.c 2016-03-23 21:09:51.000000000 +1100 @@ -29,6 +29,8 @@ * Ronald van Cuijlenborg, Alan Cox and others. */ +/* Ported to Atari by Roman Hodek and others. */ + /* * Further development / testing that should be done : * @@ -141,6 +143,14 @@ #define NCR5380_io_delay(x) #endif +#ifndef NCR5380_acquire_dma_irq +#define NCR5380_acquire_dma_irq(x) (1) +#endif + +#ifndef NCR5380_release_dma_irq +#define NCR5380_release_dma_irq(x) +#endif + static int do_abort(struct Scsi_Host *); static void do_reset(struct Scsi_Host *); @@ -658,6 +668,9 @@ static int NCR5380_queue_command(struct cmd->result = 0; + if (!NCR5380_acquire_dma_irq(instance)) + return SCSI_MLQUEUE_HOST_BUSY; + spin_lock_irqsave(&hostdata->lock, flags); /* @@ -682,6 +695,19 @@ static int NCR5380_queue_command(struct return 0; } +static inline void maybe_release_dma_irq(struct Scsi_Host *instance) +{ + struct NCR5380_hostdata *hostdata = shost_priv(instance); + + /* Caller does the locking needed to set & test these data atomically */ + if (list_empty(&hostdata->disconnected) && + list_empty(&hostdata->unissued) && + list_empty(&hostdata->autosense) && + !hostdata->connected && + !hostdata->selecting) + NCR5380_release_dma_irq(instance); +} + /** * dequeue_next_cmd - dequeue a command for processing * @instance: the scsi host instance @@ -783,6 +809,7 @@ static void NCR5380_main(struct work_str if (!NCR5380_select(instance, cmd)) { dsprintk(NDEBUG_MAIN, instance, "main: select complete\n"); + maybe_release_dma_irq(instance); } else { dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, instance, "main: select failed, returning %p to queue\n", cmd); @@ -1828,6 +1855,8 @@ static void NCR5380_information_transfer /* Enable reselect interrupts */ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); + + maybe_release_dma_irq(instance); return; case MESSAGE_REJECT: /* Accept message by clearing ACK */ @@ -1963,6 +1992,7 @@ static void NCR5380_information_transfer hostdata->connected = NULL; cmd->result = DID_ERROR << 16; complete_cmd(instance, cmd); + maybe_release_dma_irq(instance); NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); return; } @@ -2256,6 +2286,7 @@ out: dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd); queue_work(hostdata->work_q, &hostdata->main_task); + maybe_release_dma_irq(instance); spin_unlock_irqrestore(&hostdata->lock, flags); return result; @@ -2336,6 +2367,7 @@ static int NCR5380_bus_reset(struct scsi hostdata->dma_len = 0; queue_work(hostdata->work_q, &hostdata->main_task); + maybe_release_dma_irq(instance); spin_unlock_irqrestore(&hostdata->lock, flags); return SUCCESS; Index: linux/drivers/scsi/atari_scsi.c =================================================================== --- linux.orig/drivers/scsi/atari_scsi.c 2016-03-23 21:09:44.000000000 +1100 +++ linux/drivers/scsi/atari_scsi.c 2016-03-23 21:09:51.000000000 +1100 @@ -99,9 +99,9 @@ #define NCR5380_abort atari_scsi_abort #define NCR5380_info atari_scsi_info -#define NCR5380_dma_read_setup(instance, data, count) \ +#define NCR5380_dma_recv_setup(instance, data, count) \ atari_scsi_dma_setup(instance, data, count, 0) -#define NCR5380_dma_write_setup(instance, data, count) \ +#define NCR5380_dma_send_setup(instance, data, count) \ atari_scsi_dma_setup(instance, data, count, 1) #define NCR5380_dma_residual(instance) \ atari_scsi_dma_residual(instance) @@ -715,7 +715,7 @@ static void atari_scsi_falcon_reg_write( } -#include "atari_NCR5380.c" +#include "NCR5380.c" static int atari_scsi_bus_reset(struct scsi_cmnd *cmd) {