From patchwork Mon Jun 6 14:18:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= X-Patchwork-Id: 579250 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 445E5C433EF for ; Mon, 6 Jun 2022 14:19:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239469AbiFFOTR (ORCPT ); Mon, 6 Jun 2022 10:19:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44672 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239412AbiFFOTO (ORCPT ); Mon, 6 Jun 2022 10:19:14 -0400 Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [217.70.183.199]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E1585BD03; Mon, 6 Jun 2022 07:19:10 -0700 (PDT) Received: (Authenticated sender: clement.leger@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id D5982FF80B; Mon, 6 Jun 2022 14:19:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1654525149; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=UVNkQODBqVWRRDx3JRrIjnQHpW+gqO3sjXdNdYZmSAU=; b=BLTSh4W+RL3xkfxy7OYjW+rJz/hgJbdOv68JduJhHKPy3WPRubAktfY96L0P3YajocO5l1 M0fO+e6jZ0NhMEwGBMyqYzhZtsnTVpxTcsvpnzeUPSJnXeZeBk+EuQGH4XjOeQNJk616yQ 3nOyN9NvCLc+VPOiMpBSXa+6CTHqh4KGEiK/QtU4fSfePFtvlC2QFM9cQxDxpOCSL6rRRP AsSO3y2dPhMBvE8XfJQKbbDauFBrs5blgY9OUnZv6xKjSP6zEMeSgAWJv25y4fO+cHrj2p RbM5KJvgFE1F5bDDcZyBYsjwlmAIRqEEWduUsyhr4lz0vCg/TAuEnWCV2IrOFQ== From: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= To: Alan Stern , Greg Kroah-Hartman , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea Cc: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= , linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] usb: host: ohci-at91: add support to enter suspend using SMC Date: Mon, 6 Jun 2022 16:18:02 +0200 Message-Id: <20220606141802.165252-1-clement.leger@bootlin.com> X-Mailer: git-send-email 2.36.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org When Linux is running under OP-TEE, the SFR is set as secured and thus the AT91_OHCIICR_USB_SUSPEND register isn't accessible. Add a SMC to do the appropriate call to suspend the controller. The SMC id is fetched from the device-tree property "microchip,suspend-smc-id". if present, then the syscon regmap is not used to enter suspend and a SMC is issued. Signed-off-by: Clément Léger --- drivers/usb/host/ohci-at91.c | 69 ++++++++++++++++++++++++------------ 1 file changed, 46 insertions(+), 23 deletions(-) diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c index a24aea3d2759..e73fda4af278 100644 --- a/drivers/usb/host/ohci-at91.c +++ b/drivers/usb/host/ohci-at91.c @@ -13,6 +13,7 @@ * This file is licenced under the GPL. */ +#include #include #include #include @@ -55,6 +56,7 @@ struct ohci_at91_priv { bool clocked; bool wakeup; /* Saved wake-up state for resume */ struct regmap *sfr_regmap; + u32 smc_id; }; /* interface and function clocks; sometimes also an AHB clock */ @@ -135,6 +137,19 @@ static void at91_stop_hc(struct platform_device *pdev) static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *); +static u32 at91_dt_suspend_smc(struct device *dev) +{ + u32 smc_id; + + if (!dev->of_node) + return 0; + + if (of_property_read_u32(dev->of_node, "microchip,suspend-smc-id", &smc_id)) + return 0; + + return smc_id; +} + static struct regmap *at91_dt_syscon_sfr(void) { struct regmap *regmap; @@ -215,9 +230,13 @@ static int usb_hcd_at91_probe(const struct hc_driver *driver, goto err; } - ohci_at91->sfr_regmap = at91_dt_syscon_sfr(); - if (!ohci_at91->sfr_regmap) - dev_dbg(dev, "failed to find sfr node\n"); + ohci_at91->smc_id = at91_dt_suspend_smc(dev); + if (!ohci_at91->smc_id) { + dev_dbg(dev, "failed to find sfr suspend smc id, using regmap\n"); + ohci_at91->sfr_regmap = at91_dt_syscon_sfr(); + if (!ohci_at91->sfr_regmap) + dev_dbg(dev, "failed to find sfr node\n"); + } board = hcd->self.controller->platform_data; ohci = hcd_to_ohci(hcd); @@ -303,24 +322,30 @@ static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf) return length; } -static int ohci_at91_port_suspend(struct regmap *regmap, u8 set) +static int ohci_at91_port_suspend(struct ohci_at91_priv *ohci_at91, u8 set) { + struct regmap *regmap = ohci_at91->sfr_regmap; u32 regval; int ret; - if (!regmap) - return 0; + if (regmap) { + ret = regmap_read(regmap, AT91_SFR_OHCIICR, ®val); + if (ret) + return ret; - ret = regmap_read(regmap, AT91_SFR_OHCIICR, ®val); - if (ret) - return ret; + if (set) + regval |= AT91_OHCIICR_USB_SUSPEND; + else + regval &= ~AT91_OHCIICR_USB_SUSPEND; - if (set) - regval |= AT91_OHCIICR_USB_SUSPEND; - else - regval &= ~AT91_OHCIICR_USB_SUSPEND; + regmap_write(regmap, AT91_SFR_OHCIICR, regval); + } else if (ohci_at91->smc_id) { + struct arm_smccc_res res; - regmap_write(regmap, AT91_SFR_OHCIICR, regval); + arm_smccc_smc(ohci_at91->smc_id, set, 0, 0, 0, 0, 0, 0, &res); + if (res.a0) + return -EINVAL; + } return 0; } @@ -357,9 +382,8 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, case USB_PORT_FEAT_SUSPEND: dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n"); - if (valid_port(wIndex) && ohci_at91->sfr_regmap) { - ohci_at91_port_suspend(ohci_at91->sfr_regmap, - 1); + if (valid_port(wIndex)) { + ohci_at91_port_suspend(ohci_at91, 1); return 0; } break; @@ -400,9 +424,8 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, case USB_PORT_FEAT_SUSPEND: dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n"); - if (valid_port(wIndex) && ohci_at91->sfr_regmap) { - ohci_at91_port_suspend(ohci_at91->sfr_regmap, - 0); + if (valid_port(wIndex)) { + ohci_at91_port_suspend(ohci_at91, 0); return 0; } break; @@ -630,10 +653,10 @@ ohci_hcd_at91_drv_suspend(struct device *dev) /* flush the writes */ (void) ohci_readl (ohci, &ohci->regs->control); msleep(1); - ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1); + ohci_at91_port_suspend(ohci_at91, 1); at91_stop_clock(ohci_at91); } else { - ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1); + ohci_at91_port_suspend(ohci_at91, 1); } return ret; @@ -645,7 +668,7 @@ ohci_hcd_at91_drv_resume(struct device *dev) struct usb_hcd *hcd = dev_get_drvdata(dev); struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); - ohci_at91_port_suspend(ohci_at91->sfr_regmap, 0); + ohci_at91_port_suspend(ohci_at91, 0); if (ohci_at91->wakeup) disable_irq_wake(hcd->irq);