From patchwork Wed Oct 21 06:04:31 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "majun (F)" X-Patchwork-Id: 7454611 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 057839F36A for ; Wed, 21 Oct 2015 06:11:46 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B39D6208A0 for ; Wed, 21 Oct 2015 06:11:44 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E16B320828 for ; Wed, 21 Oct 2015 06:11:39 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZombG-0006rV-3S; Wed, 21 Oct 2015 06:10:14 +0000 Received: from szxga02-in.huawei.com ([119.145.14.65]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Zomb1-0004Tz-T1 for linux-arm-kernel@lists.infradead.org; Wed, 21 Oct 2015 06:10:01 +0000 Received: from 172.24.1.49 (EHLO szxeml422-hub.china.huawei.com) ([172.24.1.49]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CUQ29351; Wed, 21 Oct 2015 14:04:44 +0800 (CST) Received: from localhost (10.177.235.245) by szxeml422-hub.china.huawei.com (10.82.67.152) with Microsoft SMTP Server id 14.3.235.1; Wed, 21 Oct 2015 14:04:37 +0800 From: MaJun To: , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v7 3/4] irqchip:create irq domain for each mbigen device Date: Wed, 21 Oct 2015 14:04:31 +0800 Message-ID: <1445407472-6120-4-git-send-email-majun258@huawei.com> X-Mailer: git-send-email 1.9.5.msysgit.1 In-Reply-To: <1445407472-6120-1-git-send-email-majun258@huawei.com> References: <1445407472-6120-1-git-send-email-majun258@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.177.235.245] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151020_231000_750478_E6C814F4 X-CRM114-Status: GOOD ( 18.83 ) X-Spam-Score: -4.2 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Ma Jun For peripheral devices which connect to mbigen,mbigen is a interrupt controller. So, we create irq domain for each mbigen device and add mbigen irq domain into irq hierarchy structure. Signed-off-by: Ma Jun --- drivers/irqchip/irq-mbigen.c | 160 ++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 160 insertions(+), 0 deletions(-) diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c index f18132f..a0bbc2d 100644 --- a/drivers/irqchip/irq-mbigen.c +++ b/drivers/irqchip/irq-mbigen.c @@ -16,27 +16,172 @@ * along with this program. If not, see . */ +#include +#include #include +#include #include #include #include #include #include +/* Interrupt numbers per mbigen node supported */ +#define IRQS_PER_MBIGEN_NODE 128 + +/* 16 irqs (Pin0-pin15) are reserved for each mbigen chip */ +#define RESERVED_IRQ_PER_MBIGEN_CHIP 16 + +/** + * In mbigen vector register + * bit[21:12]: event id value + * bit[11:0]: device id + */ +#define IRQ_EVENT_ID_SHIFT 12 +#define IRQ_EVENT_ID_MASK 0x3ff + +/* register range of each mbigen node */ +#define MBIGEN_NODE_OFFSET 0x1000 + +/* offset of vector register in mbigen node */ +#define REG_MBIGEN_VEC_OFFSET 0x200 + /** * struct mbigen_device - holds the information of mbigen device. * * @pdev: pointer to the platform device structure of mbigen chip. * @base: mapped address of this mbigen chip. + * @domain: pointer to the irq domain */ struct mbigen_device { struct platform_device *pdev; void __iomem *base; + struct irq_domain *domain; +}; + +/** + * struct mbigen_irq_data - private data of each irq + * + * @base: mapped address of mbigen chip + * @reg_vec: addr offset of interrupt vector register. + */ +struct mbigen_irq_data { + void __iomem *base; + unsigned int reg_vec; +}; + +static inline int get_mbigen_vec_reg(u32 nid, u32 offset) +{ + return (offset * 4) + nid * MBIGEN_NODE_OFFSET + + REG_MBIGEN_VEC_OFFSET; +} + + +static struct irq_chip mbigen_irq_chip = { + .name = "mbigen-v2", +}; + +static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg) +{ + struct mbigen_irq_data *mgn_irq_data = irq_get_chip_data(desc->irq); + u32 val; + + val = readl_relaxed(mgn_irq_data->reg_vec + mgn_irq_data->base); + + val &= ~(IRQ_EVENT_ID_MASK << IRQ_EVENT_ID_SHIFT); + val |= (msg->data << IRQ_EVENT_ID_SHIFT); + + writel_relaxed(val, mgn_irq_data->reg_vec + mgn_irq_data->base); +} + +static struct mbigen_irq_data *set_mbigen_irq_data(int hwirq) +{ + struct mbigen_irq_data *datap; + unsigned int nid, pin_offset; + + datap = kzalloc(sizeof(*datap), GFP_KERNEL); + if (!datap) + return NULL; + + /* get the mbigen node number */ + nid = (hwirq - RESERVED_IRQ_PER_MBIGEN_CHIP) / IRQS_PER_MBIGEN_NODE + 1; + + pin_offset = (hwirq - RESERVED_IRQ_PER_MBIGEN_CHIP) + % IRQS_PER_MBIGEN_NODE; + + datap->reg_vec = get_mbigen_vec_reg(nid, pin_offset); + + return datap; +} + +static int mbigen_domain_translate(struct irq_domain *d, + struct irq_fwspec *fwspec, + unsigned long *hwirq, + unsigned int *type) +{ + if (is_of_node(fwspec->fwnode)) { + if (fwspec->param_count != 2) + return -EINVAL; + + *hwirq = fwspec->param[0]; + *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK; + + return 0; + } + return -EINVAL; +} + +static int mbigen_irq_domain_alloc(struct irq_domain *domain, + unsigned int virq, + unsigned int nr_irqs, + void *args) +{ + struct irq_fwspec *fwspec = args; + irq_hw_number_t hwirq = fwspec->param[0]; + struct mbigen_device *mgn_chip; + struct mbigen_irq_data *mgn_irq_data; + int i, err; + + err = platform_msi_domain_alloc(domain, virq, nr_irqs); + if (err) + return err; + + /* set related information of this irq */ + mgn_irq_data = set_mbigen_irq_data(hwirq); + if (!mgn_irq_data) + return err; + + mgn_chip = platform_msi_get_host_data(domain); + mgn_irq_data->base = mgn_chip->base; + + for (i = 0; i < nr_irqs; i++) + irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, + &mbigen_irq_chip, mgn_irq_data); + + return 0; +} + +static void mbigen_domain_free(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + struct irq_data *d = irq_domain_get_irq_data(domain, virq); + struct mbigen_irq_data *mgn_irq_data = irq_data_get_irq_chip_data(d); + + kfree(mgn_irq_data); + irq_domain_free_irqs_common(domain, virq, nr_irqs); +} + +static struct irq_domain_ops mbigen_domain_ops = { + .translate = mbigen_domain_translate, + .alloc = mbigen_irq_domain_alloc, + .free = mbigen_domain_free, }; static int mbigen_device_probe(struct platform_device *pdev) { struct mbigen_device *mgn_chip; + struct irq_domain *domain; + u32 num_msis; mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL); if (!mgn_chip) @@ -45,6 +190,20 @@ static int mbigen_device_probe(struct platform_device *pdev) mgn_chip->pdev = pdev; mgn_chip->base = of_iomap(pdev->dev.of_node, 0); + /* If there is no "num-msi" property, assume 64... */ + if (of_property_read_u32(pdev->dev.of_node, "num-msis", &num_msis) < 0) + num_msis = 64; + + domain = platform_msi_create_device_domain(&pdev->dev, num_msis, + mbigen_write_msg, + &mbigen_domain_ops, + mgn_chip); + + if (!domain) + return -ENOMEM; + + mgn_chip->domain = domain; + platform_set_drvdata(pdev, mgn_chip); return 0; @@ -54,6 +213,7 @@ static int mbigen_device_remove(struct platform_device *pdev) { struct mbigen_device *mgn_chip = platform_get_drvdata(pdev); + irq_domain_remove(mgn_chip->domain); iounmap(mgn_chip->base); return 0;