From patchwork Tue Aug 21 09:44:02 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mohammed Afzal X-Patchwork-Id: 179021 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:4978:20e::2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id C5EA72C008A for ; Tue, 21 Aug 2012 19:45:09 +1000 (EST) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T3l0P-00025r-Op; Tue, 21 Aug 2012 09:44:14 +0000 Received: from devils.ext.ti.com ([198.47.26.153]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1T3l0I-000232-T7 for linux-mtd@lists.infradead.org; Tue, 21 Aug 2012 09:44:08 +0000 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id q7L9i4Fx010164; Tue, 21 Aug 2012 04:44:04 -0500 Received: from DBDE70.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id q7L9i37k017461; Tue, 21 Aug 2012 15:14:03 +0530 (IST) Received: from dbdp32.itg.ti.com (172.24.170.251) by dbde70.ent.ti.com (172.24.170.148) with Microsoft SMTP Server id 14.1.323.3; Tue, 21 Aug 2012 15:14:03 +0530 Received: from udx0156546.apr.dhcp.ti.com (dbdp20.itg.ti.com [172.24.170.38]) by dbdp32.itg.ti.com (8.13.8/8.13.8) with ESMTP id q7L9i2Yd028251; Tue, 21 Aug 2012 15:14:02 +0530 From: Afzal Mohammed To: , , , Subject: [PATCH v3 08/10] ARM: OMAP2+: gpmc: Modify interrupt handling Date: Tue, 21 Aug 2012 15:14:02 +0530 Message-ID: X-Mailer: git-send-email 1.7.1 In-Reply-To: References: MIME-Version: 1.0 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -7.1 (-------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-7.1 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [198.47.26.153 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.2 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: ivan.djelic@parrot.com, Afzal Mohammed X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-mtd-bounces@lists.infradead.org Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Modify interrupt handling such that interrupts can be handled by GPMC client drivers using standard interrupt APIs rather than requiring the drivers to have knowledge about GPMC interrupt handling. Currently only NAND related interrupts has been considered (which is the case even without this change) as the only user of GPMC interrupt is NAND. Signed-off-by: Afzal Mohammed --- arch/arm/mach-omap2/gpmc.c | 136 ++++++++++++++++++++++++++++---- arch/arm/plat-omap/include/plat/gpmc.h | 1 + 2 files changed, 120 insertions(+), 17 deletions(-) diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c index 5cce9b0..39c30d9 100644 --- a/arch/arm/mach-omap2/gpmc.c +++ b/arch/arm/mach-omap2/gpmc.c @@ -78,6 +78,15 @@ #define ENABLE_PREFETCH (0x1 << 7) #define DMA_MPU_MODE 2 +/* XXX: Only NAND irq has been considered,currently these are the only ones used + */ +#define GPMC_NR_IRQ 2 + +struct gpmc_client_irq { + unsigned irq; + u32 bitmask; +}; + /* Structure to save gpmc cs context */ struct gpmc_cs_config { u32 config1; @@ -105,6 +114,10 @@ struct omap3_gpmc_regs { struct gpmc_cs_config cs_context[GPMC_CS_NUM]; }; +static struct gpmc_client_irq gpmc_client_irq[GPMC_NR_IRQ]; +static struct irq_chip gpmc_irq_chip; +static unsigned gpmc_irq_start; + static struct resource gpmc_mem_root; static struct resource gpmc_cs_mem[GPMC_CS_NUM]; static DEFINE_SPINLOCK(gpmc_mem_lock); @@ -702,6 +715,97 @@ void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs) reg->gpmc_bch_result0 = gpmc_base + GPMC_ECC_BCH_RESULT_0; } +int gpmc_get_client_irq(unsigned irq_config) +{ + int i; + + if (hweight32(irq_config) > 1) + return 0; + + for (i = 0; i < GPMC_NR_IRQ; i++) + if (gpmc_client_irq[i].bitmask & irq_config) + return gpmc_client_irq[i].irq; + + return 0; +} + +static int gpmc_irq_endis(unsigned irq, bool endis) +{ + int i; + u32 regval; + + for (i = 0; i < GPMC_NR_IRQ; i++) + if (irq == gpmc_client_irq[i].irq) { + regval = gpmc_read_reg(GPMC_IRQENABLE); + if (endis) + regval |= gpmc_client_irq[i].bitmask; + else + regval &= ~gpmc_client_irq[i].bitmask; + gpmc_write_reg(GPMC_IRQENABLE, regval); + break; + } + + return 0; +} + +static void gpmc_irq_disable(struct irq_data *p) +{ + gpmc_irq_endis(p->irq, false); +} + +static void gpmc_irq_enable(struct irq_data *p) +{ + gpmc_irq_endis(p->irq, true); +} + +static void gpmc_irq_noop(struct irq_data *data) { } + +static unsigned int gpmc_irq_noop_ret(struct irq_data *data) { return 0; } + +static int gpmc_setup_irq(int gpmc_irq) +{ + int i; + u32 regval; + + if (!gpmc_irq) + return -EINVAL; + + gpmc_irq_start = irq_alloc_descs(-1, 0, GPMC_NR_IRQ, 0); + if (IS_ERR_VALUE(gpmc_irq_start)) { + pr_err("irq_alloc_descs failed\n"); + return gpmc_irq_start; + } + + gpmc_irq_chip.name = "gpmc"; + gpmc_irq_chip.irq_startup = gpmc_irq_noop_ret; + gpmc_irq_chip.irq_enable = gpmc_irq_enable; + gpmc_irq_chip.irq_disable = gpmc_irq_disable; + gpmc_irq_chip.irq_shutdown = gpmc_irq_noop; + gpmc_irq_chip.irq_ack = gpmc_irq_noop; + gpmc_irq_chip.irq_mask = gpmc_irq_noop; + gpmc_irq_chip.irq_unmask = gpmc_irq_noop; + + gpmc_client_irq[0].bitmask = GPMC_IRQ_FIFOEVENTENABLE; + gpmc_client_irq[1].bitmask = GPMC_IRQ_COUNT_EVENT; + + for (i = 0; i < GPMC_NR_IRQ; i++) { + gpmc_client_irq[i].irq = gpmc_irq_start + i; + irq_set_chip_and_handler(gpmc_client_irq[i].irq, + &gpmc_irq_chip, handle_simple_irq); + set_irq_flags(gpmc_client_irq[i].irq, + IRQF_VALID | IRQF_NOAUTOEN); + } + + /* Disable interrupts */ + gpmc_write_reg(GPMC_IRQENABLE, 0); + + /* clear interrupts */ + regval = gpmc_read_reg(GPMC_IRQSTATUS); + gpmc_write_reg(GPMC_IRQSTATUS, regval); + + return request_irq(gpmc_irq, gpmc_handle_irq, 0, "gpmc", NULL); +} + static void __init gpmc_mem_init(void) { int cs; @@ -731,8 +835,8 @@ static void __init gpmc_mem_init(void) static int __init gpmc_init(void) { - u32 l, irq; - int cs, ret = -EINVAL; + u32 l; + int ret = -EINVAL; int gpmc_irq; char *ck = NULL; @@ -781,16 +885,7 @@ static int __init gpmc_init(void) gpmc_write_reg(GPMC_SYSCONFIG, l); gpmc_mem_init(); - /* initalize the irq_chained */ - irq = OMAP_GPMC_IRQ_BASE; - for (cs = 0; cs < GPMC_CS_NUM; cs++) { - irq_set_chip_and_handler(irq, &dummy_irq_chip, - handle_simple_irq); - set_irq_flags(irq, IRQF_VALID); - irq++; - } - - ret = request_irq(gpmc_irq, gpmc_handle_irq, IRQF_SHARED, "gpmc", NULL); + ret = gpmc_setup_irq(gpmc_irq); if (ret) pr_err("gpmc: irq-%d could not claim: err %d\n", gpmc_irq, ret); @@ -800,12 +895,19 @@ postcore_initcall(gpmc_init); static irqreturn_t gpmc_handle_irq(int irq, void *dev) { - u8 cs; + int i; + u32 regval; + + regval = gpmc_read_reg(GPMC_IRQSTATUS); + + if (!regval) + return IRQ_NONE; + + for (i = 0; i < GPMC_NR_IRQ; i++) + if (regval & gpmc_client_irq[i].bitmask) + generic_handle_irq(gpmc_client_irq[i].irq); - /* check cs to invoke the irq */ - cs = ((gpmc_read_reg(GPMC_PREFETCH_CONFIG1)) >> CS_NUM_SHIFT) & 0x7; - if (OMAP_GPMC_IRQ_BASE+cs <= OMAP_GPMC_IRQ_END) - generic_handle_irq(OMAP_GPMC_IRQ_BASE+cs); + gpmc_write_reg(GPMC_IRQSTATUS, regval); return IRQ_HANDLED; } diff --git a/arch/arm/plat-omap/include/plat/gpmc.h b/arch/arm/plat-omap/include/plat/gpmc.h index 06198a5..2e6e259 100644 --- a/arch/arm/plat-omap/include/plat/gpmc.h +++ b/arch/arm/plat-omap/include/plat/gpmc.h @@ -150,6 +150,7 @@ struct gpmc_nand_regs { }; extern void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs); +extern int gpmc_get_client_irq(unsigned irq_config); extern unsigned int gpmc_ns_to_ticks(unsigned int time_ns); extern unsigned int gpmc_ps_to_ticks(unsigned int time_ps);