From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roger Quadros Subject: [PATCH v3 08/27] memory: omap-gpmc: Add IRQ ops for GPMC-NAND interface Date: Fri, 18 Sep 2015 17:53:30 +0300 Message-ID: <1442588029-13769-9-git-send-email-rogerq@ti.com> References: <1442588029-13769-1-git-send-email-rogerq@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1442588029-13769-1-git-send-email-rogerq@ti.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-mtd" Errors-To: linux-mtd-bounces+gldm-linux-mtd-36=gmane.org@lists.infradead.org To: tony@atomide.com Cc: devicetree@vger.kernel.org, linux-omap@vger.kernel.org, nsekhar@ti.com, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, ezequiel@vanguardiasur.com.ar, javier@dowhile0.org, computersforpeace@gmail.com, dwmw2@infradead.org, fcooper@ti.com, Roger Quadros List-Id: devicetree@vger.kernel.org Provide functions to enable/disable NAND IRQs, get NAND event status and clear NAND events. The NAND events of interest are TERMCOUNT and FIFOEVENT. Signed-off-by: Roger Quadros --- drivers/memory/omap-gpmc.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/omap-gpmc.h | 4 ++++ 2 files changed, 54 insertions(+) diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c index a9071bb..e75226d 100644 --- a/drivers/memory/omap-gpmc.c +++ b/drivers/memory/omap-gpmc.c @@ -1078,8 +1078,58 @@ static bool gpmc_nand_writebuffer_empty(void) return false; } +static int gpmc_nand_irq_enable(enum gpmc_nand_irq irq) +{ + u32 reg; + + if (irq > GPMC_NAND_IRQ_TERMCOUNT) + return -EINVAL; + + reg = gpmc_read_reg(GPMC_IRQENABLE); + reg |= BIT(irq); + gpmc_write_reg(GPMC_IRQENABLE, reg); + + return 0; +} + +static int gpmc_nand_irq_disable(enum gpmc_nand_irq irq) +{ + u32 reg; + + if (irq > GPMC_NAND_IRQ_TERMCOUNT) + return -EINVAL; + + reg = gpmc_read_reg(GPMC_IRQENABLE); + reg &= ~BIT(irq); + gpmc_write_reg(GPMC_IRQENABLE, reg); + + return 0; +} + +static void gpmc_nand_irq_clear(enum gpmc_nand_irq irq) +{ + if (irq > GPMC_NAND_IRQ_TERMCOUNT) + return; + + /* setting bit to 1 clears the bit in IRQSTATUS */ + gpmc_write_reg(GPMC_IRQSTATUS, BIT(irq)); +} + +static u32 gpmc_nand_irq_status(void) +{ + u32 reg = gpmc_read_reg(GPMC_IRQSTATUS); + + /* Mask out non-NAND bits */ + reg &= GPMC_IRQENABLE_FIFOEVENT | GPMC_IRQENABLE_TERMCOUNT; + return reg; +} + static struct gpmc_nand_ops nand_ops = { .nand_writebuffer_empty = gpmc_nand_writebuffer_empty, + .nand_irq_enable = gpmc_nand_irq_enable, + .nand_irq_disable = gpmc_nand_irq_disable, + .nand_irq_clear = gpmc_nand_irq_clear, + .nand_irq_status = gpmc_nand_irq_status, }; /** diff --git a/include/linux/omap-gpmc.h b/include/linux/omap-gpmc.h index 58f6bd2..b76cec3 100644 --- a/include/linux/omap-gpmc.h +++ b/include/linux/omap-gpmc.h @@ -11,6 +11,10 @@ #define GPMC_CONFIG_WP 0x00000005 +/* GPMC IRQENABLE/IRQSTATUS BIT defs */ +#define GPMC_IRQENABLE_FIFOEVENT BIT(0) +#define GPMC_IRQENABLE_TERMCOUNT BIT(1) + enum gpmc_nand_irq { GPMC_NAND_IRQ_FIFOEVENT = 0, GPMC_NAND_IRQ_TERMCOUNT, -- 2.1.4 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/