From patchwork Wed Aug 7 07:48:53 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tero Kristo X-Patchwork-Id: 11081393 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 57AA31399 for ; Wed, 7 Aug 2019 07:49:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4B2E2287A8 for ; Wed, 7 Aug 2019 07:49:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3F52D287C1; Wed, 7 Aug 2019 07:49:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9A8A1287EA for ; Wed, 7 Aug 2019 07:49:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387414AbfHGHth (ORCPT ); Wed, 7 Aug 2019 03:49:37 -0400 Received: from lelv0143.ext.ti.com ([198.47.23.248]:57896 "EHLO lelv0143.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387396AbfHGHth (ORCPT ); Wed, 7 Aug 2019 03:49:37 -0400 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id x777nTvs026490; Wed, 7 Aug 2019 02:49:29 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1565164169; bh=LLlI9QgqZvxHRCe0+bEdCU1oHYk2BhHjSLG9+Km2gc0=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=XXpIr4TPTjrFWaPc7P9GiHwxFpchkO/Jffdzp2+l1gRl9Ko+W8zI0Xzg5fWiFUKW6 /gASTq81yndGNXqc5jR6+9yUa/fctDb+Ra5X5SW2EHksOwgpgGvwlRwGoV77pcvDJe 38oGDN5m7tROdddlnu2sEvbhToOg2oyvBKxAzrCw= Received: from DFLE109.ent.ti.com (dfle109.ent.ti.com [10.64.6.30]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x777nTfa050698 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 7 Aug 2019 02:49:29 -0500 Received: from DFLE108.ent.ti.com (10.64.6.29) by DFLE109.ent.ti.com (10.64.6.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Wed, 7 Aug 2019 02:49:28 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Wed, 7 Aug 2019 02:49:28 -0500 Received: from gomoku.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id x777nNHe118711; Wed, 7 Aug 2019 02:49:27 -0500 From: Tero Kristo To: , , , CC: , , Subject: [PATCH 2/8] soc: ti: add initial PRM driver with reset control support Date: Wed, 7 Aug 2019 10:48:53 +0300 Message-ID: <1565164139-21886-3-git-send-email-t-kristo@ti.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1565164139-21886-1-git-send-email-t-kristo@ti.com> References: <1565164139-21886-1-git-send-email-t-kristo@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add initial PRM (Power and Reset Management) driver for TI OMAP class SoCs. Initially this driver only supports reset control, but can be extended to support rest of the functionality, like powerdomain control, PRCM irq support etc. Signed-off-by: Tero Kristo --- arch/arm/mach-omap2/Kconfig | 1 + drivers/soc/ti/Makefile | 1 + drivers/soc/ti/omap_prm.c | 216 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 218 insertions(+) create mode 100644 drivers/soc/ti/omap_prm.c diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig index fdb6743..42ad063 100644 --- a/arch/arm/mach-omap2/Kconfig +++ b/arch/arm/mach-omap2/Kconfig @@ -109,6 +109,7 @@ config ARCH_OMAP2PLUS select TI_SYSC select OMAP_IRQCHIP select CLKSRC_TI_32K + select RESET_CONTROLLER help Systems based on OMAP2, OMAP3, OMAP4 or OMAP5 diff --git a/drivers/soc/ti/Makefile b/drivers/soc/ti/Makefile index b3868d3..788b5cd 100644 --- a/drivers/soc/ti/Makefile +++ b/drivers/soc/ti/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_KEYSTONE_NAVIGATOR_QMSS) += knav_qmss.o knav_qmss-y := knav_qmss_queue.o knav_qmss_acc.o obj-$(CONFIG_KEYSTONE_NAVIGATOR_DMA) += knav_dma.o obj-$(CONFIG_AMX3_PM) += pm33xx.o +obj-$(CONFIG_ARCH_OMAP2PLUS) += omap_prm.o obj-$(CONFIG_WKUP_M3_IPC) += wkup_m3_ipc.o obj-$(CONFIG_TI_SCI_PM_DOMAINS) += ti_sci_pm_domains.o obj-$(CONFIG_TI_SCI_INTA_MSI_DOMAIN) += ti_sci_inta_msi.o diff --git a/drivers/soc/ti/omap_prm.c b/drivers/soc/ti/omap_prm.c new file mode 100644 index 0000000..7c89eb8 --- /dev/null +++ b/drivers/soc/ti/omap_prm.c @@ -0,0 +1,216 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * OMAP2+ PRM driver + * + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ + * Tero Kristo + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct omap_rst_map { + s8 rst; + s8 st; +}; + +struct omap_prm_data { + u32 base; + const char *name; + u16 pwstctrl; + u16 pwstst; + u16 rstctl; + u16 rstst; + struct omap_rst_map *rstmap; + u8 flags; +}; + +struct omap_prm { + const struct omap_prm_data *data; + void __iomem *base; +}; + +struct omap_reset_data { + struct reset_controller_dev rcdev; + struct omap_prm *prm; +}; + +#define to_omap_reset_data(p) container_of((p), struct omap_reset_data, rcdev) + +#define OMAP_MAX_RESETS 8 +#define OMAP_RESET_MAX_WAIT 10000 + +#define OMAP_PRM_NO_RSTST BIT(0) + +static const struct of_device_id omap_prm_id_table[] = { + { }, +}; + +static int omap_reset_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct omap_reset_data *reset = to_omap_reset_data(rcdev); + u32 v; + + v = readl_relaxed(reset->prm->base + reset->prm->data->rstst); + v &= 1 << id; + v >>= id; + + return v; +} + +static int omap_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct omap_reset_data *reset = to_omap_reset_data(rcdev); + u32 v; + + /* assert the reset control line */ + v = readl_relaxed(reset->prm->base + reset->prm->data->rstctl); + v |= 1 << id; + writel_relaxed(v, reset->prm->base + reset->prm->data->rstctl); + + return 0; +} + +static int omap_reset_get_st_bit(struct omap_reset_data *reset, + unsigned long id) +{ + struct omap_rst_map *map = reset->prm->data->rstmap; + + while (map && map->rst >= 0) { + if (map->rst == id) + return map->st; + + map++; + } + + return id; +} + +/* + * Note that status will not change until clocks are on, and clocks cannot be + * enabled until reset is deasserted. Consumer drivers must check status + * separately after enabling clocks. + */ +static int omap_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct omap_reset_data *reset = to_omap_reset_data(rcdev); + u32 v; + int st_bit = id; + bool has_rstst; + + /* check the current status to avoid de-asserting the line twice */ + v = readl_relaxed(reset->prm->base + reset->prm->data->rstctl); + if (!(v & BIT(id))) + return -EEXIST; + + has_rstst = !(reset->prm->data->flags & OMAP_PRM_NO_RSTST); + + if (has_rstst) { + st_bit = omap_reset_get_st_bit(reset, id); + + /* Clear the reset status by writing 1 to the status bit */ + v = readl_relaxed(reset->prm->base + reset->prm->data->rstst); + v |= 1 << st_bit; + writel_relaxed(v, reset->prm->base + reset->prm->data->rstst); + } + + /* de-assert the reset control line */ + v = readl_relaxed(reset->prm->base + reset->prm->data->rstctl); + v &= ~(1 << id); + writel_relaxed(v, reset->prm->base + reset->prm->data->rstctl); + + return 0; +} + +static const struct reset_control_ops omap_reset_ops = { + .assert = omap_reset_assert, + .deassert = omap_reset_deassert, + .status = omap_reset_status, +}; + +static int omap_prm_reset_probe(struct platform_device *pdev, + struct omap_prm *prm) +{ + struct omap_reset_data *reset; + + /* + * Check if we have resets. If either rstctl or rstst is + * non-zero, we have reset registers in place. Additionally + * the flag OMAP_PRM_NO_RSTST implies that we have resets. + */ + if (!prm->data->rstctl && !prm->data->rstst && + !(prm->data->flags & OMAP_PRM_NO_RSTST)) + return 0; + + reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL); + if (!reset) + return -ENOMEM; + + reset->rcdev.owner = THIS_MODULE; + reset->rcdev.ops = &omap_reset_ops; + reset->rcdev.of_node = pdev->dev.of_node; + reset->rcdev.nr_resets = OMAP_MAX_RESETS; + + reset->prm = prm; + + return devm_reset_controller_register(&pdev->dev, &reset->rcdev); +} + +static int omap_prm_probe(struct platform_device *pdev) +{ + struct resource *res; + const struct omap_prm_data *data; + struct omap_prm *prm; + const struct of_device_id *match; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + match = of_match_device(omap_prm_id_table, &pdev->dev); + if (!match) + return -ENOTSUPP; + + prm = devm_kzalloc(&pdev->dev, sizeof(*prm), GFP_KERNEL); + if (!prm) + return -ENOMEM; + + data = match->data; + + while (data->base != res->start) { + if (!data->base) + return -EINVAL; + data++; + } + + prm->data = data; + + prm->base = devm_ioremap_resource(&pdev->dev, res); + if (!prm->base) + return -ENOMEM; + + return omap_prm_reset_probe(pdev, prm); +} + +static struct platform_driver omap_prm_driver = { + .probe = omap_prm_probe, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = omap_prm_id_table, + }, +}; +builtin_platform_driver(omap_prm_driver); + +MODULE_ALIAS("platform:prm"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("omap2+ prm driver");