Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030369AbcJaUVe (ORCPT ); Mon, 31 Oct 2016 16:21:34 -0400 Received: from ns.gsystem.sk ([62.176.172.50]:36105 "EHLO gsystem.sk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S946366AbcJaUSt (ORCPT ); Mon, 31 Oct 2016 16:18:49 -0400 From: Ondrej Zary To: Christoph Hellwig Cc: Finn Thain , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/6] NCR5380: Use probe_irq_*() for IRQ probing Date: Mon, 31 Oct 2016 21:18:27 +0100 Message-Id: <1477945112-25659-2-git-send-email-linux@rainbow-software.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1477945112-25659-1-git-send-email-linux@rainbow-software.org> References: <1477945112-25659-1-git-send-email-linux@rainbow-software.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6477 Lines: 202 Use standard probe_irq_on() and probe_irq_off() functions instead of own implementation. This prevents warning messages like this in the kernel log: genirq: Flags mismatch irq 1. 00000000 (NCR-probe) vs. 00000080 (i8042) Move the IRQ trigger code to a separate function so it can be used for other purposes (testing if the IRQ works) and move the code from NCR5380 to g_NCR5380. Also add missing IRQ reset before and after the probe. Signed-off-by: Ondrej Zary --- drivers/scsi/NCR5380.c | 77 +--------------------------------------------- drivers/scsi/NCR5380.h | 1 - drivers/scsi/g_NCR5380.c | 50 +++++++++++++++++++++++++++++- 3 files changed, 50 insertions(+), 78 deletions(-) diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index d849ffa..4f5ca79 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -97,9 +97,6 @@ * and macros and include this file in your driver. * * These macros control options : - * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be - * defined. - * * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically * for commands that return with a CHECK CONDITION status. * @@ -127,9 +124,7 @@ * NCR5380_dma_residual - residual byte count * * The generic driver is initialized by calling NCR5380_init(instance), - * after setting the appropriate host specific fields and ID. If the - * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, - * possible) function may be used. + * after setting the appropriate host specific fields and ID. */ #ifndef NCR5380_io_delay @@ -351,76 +346,6 @@ static void NCR5380_print_phase(struct Scsi_Host *instance) } #endif - -static int probe_irq; - -/** - * probe_intr - helper for IRQ autoprobe - * @irq: interrupt number - * @dev_id: unused - * @regs: unused - * - * Set a flag to indicate the IRQ in question was received. This is - * used by the IRQ probe code. - */ - -static irqreturn_t probe_intr(int irq, void *dev_id) -{ - probe_irq = irq; - return IRQ_HANDLED; -} - -/** - * NCR5380_probe_irq - find the IRQ of an NCR5380 - * @instance: NCR5380 controller - * @possible: bitmask of ISA IRQ lines - * - * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ - * and then looking to see what interrupt actually turned up. - */ - -static int __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, - int possible) -{ - struct NCR5380_hostdata *hostdata = shost_priv(instance); - unsigned long timeout; - int trying_irqs, i, mask; - - for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1) - if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0)) - trying_irqs |= mask; - - timeout = jiffies + msecs_to_jiffies(250); - probe_irq = NO_IRQ; - - /* - * A interrupt is triggered whenever BSY = false, SEL = true - * and a bit set in the SELECT_ENABLE_REG is asserted on the - * SCSI bus. - * - * Note that the bus is only driven when the phase control signals - * (I/O, C/D, and MSG) match those in the TCR, so we must reset that - * to zero. - */ - - NCR5380_write(TARGET_COMMAND_REG, 0); - NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); - NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); - NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); - - while (probe_irq == NO_IRQ && time_before(jiffies, timeout)) - schedule_timeout_uninterruptible(1); - - NCR5380_write(SELECT_ENABLE_REG, 0); - NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); - - for (i = 1, mask = 2; i < 16; ++i, mask <<= 1) - if (trying_irqs & mask) - free_irq(i, NULL); - - return probe_irq; -} - /** * NCR58380_info - report driver and host information * @instance: relevant scsi host instance diff --git a/drivers/scsi/NCR5380.h b/drivers/scsi/NCR5380.h index 3c6ce54..4724558 100644 --- a/drivers/scsi/NCR5380.h +++ b/drivers/scsi/NCR5380.h @@ -290,7 +290,6 @@ static inline struct scsi_cmnd *NCR5380_to_scmd(struct NCR5380_cmd *ncmd_ptr) #define NCR5380_dprint_phase(flg, arg) do {} while (0) #endif -static int NCR5380_probe_irq(struct Scsi_Host *instance, int possible); static int NCR5380_init(struct Scsi_Host *instance, int flags); static int NCR5380_maybe_reset_bus(struct Scsi_Host *); static void NCR5380_exit(struct Scsi_Host *instance); diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c index 7299ad9..09c660b 100644 --- a/drivers/scsi/g_NCR5380.c +++ b/drivers/scsi/g_NCR5380.c @@ -67,6 +67,54 @@ MODULE_ALIAS("g_NCR5380_mmio"); MODULE_LICENSE("GPL"); +static void NCR5380_trigger_irq(struct Scsi_Host *instance) +{ + struct NCR5380_hostdata *hostdata = shost_priv(instance); + + /* + * An interrupt is triggered whenever BSY = false, SEL = true + * and a bit set in the SELECT_ENABLE_REG is asserted on the + * SCSI bus. + * + * Note that the bus is only driven when the phase control signals + * (I/O, C/D, and MSG) match those in the TCR, so we must reset that + * to zero. + */ + NCR5380_write(TARGET_COMMAND_REG, 0); + NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); + NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); + NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); + + usleep_range(1000, 20000); + + NCR5380_write(SELECT_ENABLE_REG, 0); + NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); +} + +/** + * NCR5380_probe_irq - find the IRQ of an NCR5380 + * @instance: NCR5380 controller + * + * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ + * and then looking to see what interrupt actually turned up. + */ + +static int NCR5380_probe_irq(struct Scsi_Host *instance) +{ + struct NCR5380_hostdata *hostdata = shost_priv(instance); + int irq_mask, irq; + + NCR5380_read(RESET_PARITY_INTERRUPT_REG); + irq_mask = probe_irq_on(); + NCR5380_trigger_irq(instance); + irq = probe_irq_off(irq_mask); + NCR5380_read(RESET_PARITY_INTERRUPT_REG); + if (irq < 0) + irq = NO_IRQ; + + return irq; +} + /* * Configure I/O address of 53C400A or DTC436 by writing magic numbers * to ports 0x779 and 0x379. @@ -265,7 +313,7 @@ static int generic_NCR5380_init_one(struct scsi_host_template *tpnt, if (irq != IRQ_AUTO) instance->irq = irq; else - instance->irq = NCR5380_probe_irq(instance, 0xffff); + instance->irq = NCR5380_probe_irq(instance); /* Compatibility with documented NCR5380 kernel parameters */ if (instance->irq == 255) -- Ondrej Zary