From patchwork Mon Oct 20 02:19:12 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Zhu X-Patchwork-Id: 5101861 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id CC3B59F30B for ; Mon, 20 Oct 2014 02:50:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5A662201ED for ; Mon, 20 Oct 2014 02:50:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E7B80201BB for ; Mon, 20 Oct 2014 02:50:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751569AbaJTCt6 (ORCPT ); Sun, 19 Oct 2014 22:49:58 -0400 Received: from [65.55.169.138] ([65.55.169.138]:4086 "EHLO na01-bl2-obe.outbound.protection.outlook.com" rhost-flags-FAIL-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751691AbaJTCty (ORCPT ); Sun, 19 Oct 2014 22:49:54 -0400 Received: from CH1PR03CA010.namprd03.prod.outlook.com (10.255.156.155) by BN3PR0301MB0850.namprd03.prod.outlook.com (25.160.154.148) with Microsoft SMTP Server (TLS) id 15.0.1054.13; Mon, 20 Oct 2014 02:49:45 +0000 Received: from BN1AFFO11FD037.protection.gbl (10.255.156.132) by CH1PR03CA010.outlook.office365.com (10.255.156.155) with Microsoft SMTP Server (TLS) id 15.0.1054.13 via Frontend Transport; Mon, 20 Oct 2014 02:49:44 +0000 Received: from az84smr01.freescale.net (192.88.158.2) by BN1AFFO11FD037.mail.protection.outlook.com (10.58.52.241) with Microsoft SMTP Server (TLS) id 15.0.1049.20 via Frontend Transport; Mon, 20 Oct 2014 02:49:44 +0000 Received: from shlinux1.ap.freescale.net (shlinux1.ap.freescale.net [10.192.225.216]) by az84smr01.freescale.net (8.14.3/8.14.0) with ESMTP id s9K2nc2H019778; Sun, 19 Oct 2014 19:49:41 -0700 Received: by shlinux1.ap.freescale.net (Postfix, from userid 1003) id 12C111AE212; Mon, 20 Oct 2014 10:19:18 +0800 (CST) From: Richard Zhu To: CC: , , , , Richard Zhu , Richard Zhu Subject: [PATCH v7 09/13] PCI: imx6: Add imx6sx pcie support Date: Mon, 20 Oct 2014 10:19:12 +0800 Message-ID: <1413771556-32212-10-git-send-email-richard.zhu@freescale.com> X-Mailer: git-send-email 1.7.8 In-Reply-To: <1413771556-32212-1-git-send-email-richard.zhu@freescale.com> References: <1413771556-32212-1-git-send-email-richard.zhu@freescale.com> X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:192.88.158.2; CTRY:US; IPV:CAL; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(10019020)(6009001)(428002)(189002)(199003)(97736003)(92726001)(50986999)(103686003)(105586002)(92566001)(48376002)(50466002)(62966002)(85306004)(47776003)(20776003)(93916002)(36756003)(95666004)(106466001)(229853001)(81156004)(84676001)(2351001)(107046002)(76176999)(77156001)(89996001)(21056001)(6806004)(87936001)(64706001)(88136002)(104166001)(87286001)(33646002)(4396001)(69596002)(19580395003)(19580405001)(68736004)(44976005)(50226001)(77096002)(46386002)(45336002)(46102003)(110136001)(42186005)(26826002)(99396003)(120916001)(101416001)(85852003)(52956003)(80022003)(76482002)(102836001)(16796002)(31966008)(32563001)(90966001); DIR:OUT; SFP:1102; SCL:1; SRVR:BN3PR0301MB0850; H:az84smr01.freescale.net; FPR:; MLV:ovrnspm; PTR:InfoDomainNonexistent; MX:1; A:0; LANG:en; MIME-Version: 1.0 X-Microsoft-Antispam: UriScan:; X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:;SRVR:BN3PR0301MB0850; X-Forefront-PRVS: 03706074BC Received-SPF: None (protection.outlook.com: shlinux1.ap.freescale.net does not designate permitted sender hosts) Authentication-Results: spf=none (sender IP is 192.88.158.2) smtp.mailfrom=r65037@shlinux1.ap.freescale.net; X-OriginatorOrg: freescale.com Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-8.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham 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: Richard Zhu - imx6sx pcie has its own standalone pcie power supply. In order to turn on the imx6sx pcie power during initialization. Add the pcie regulator and the gpc regmap into the imx6sx pcie structure. - imx6sx pcie has the new added reset mechanism, add the reset operations into the initialization. - register one PM call-back, enter/exit L2 state during system suspend/resume. use noirq pm_ops instead of the general pm_ops in dev_pm_ops, since cfg read/write may occurs after suspend and before resume. do msi store/re-store in suspend/resume callbacks, since controller maybe turned off, and these msi cfg maybe lost in suspend. - disp_axi clock is required by pcie inbound axi port actually. Add one more clock named pcie_inbound_axi for imx6sx pcie. - host init maybe failed, return negative value when there is a failure in the host init. - assert per-reset in suspend, and de-assert it in resume. Signed-off-by: Richard Zhu --- drivers/pci/host/pci-imx6.c | 265 ++++++++++++++++++++++++++++++++++++-------- 1 file changed, 217 insertions(+), 48 deletions(-) diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index eac96fb..5d5abe1 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -35,9 +36,12 @@ struct imx6_pcie { int reset_gpio; struct clk *pcie_bus; struct clk *pcie_phy; + struct clk *pcie_inbound_axi; struct clk *pcie; struct pcie_port pp; struct regmap *iomuxc_gpr; + struct regmap *gpc_ips_reg; + struct regulator *pcie_phy_regulator; void __iomem *mem_base; }; @@ -77,6 +81,18 @@ struct imx6_pcie { #define PHY_RX_OVRD_IN_LO_RX_DATA_EN (1 << 5) #define PHY_RX_OVRD_IN_LO_RX_PLL_EN (1 << 3) +/* GPC PCIE PHY bit definitions */ +#define GPC_CNTR 0 +#define GPC_CNTR_PCIE_PHY_PUP_REQ BIT(7) + +static inline bool is_imx6sx_pcie(struct imx6_pcie *imx6_pcie) +{ + struct pcie_port *pp = &imx6_pcie->pp; + struct device_node *np = pp->dev->of_node; + + return of_device_is_compatible(np, "fsl,imx6sx-pcie"); +} + static int pcie_phy_poll_ack(void __iomem *dbi_base, int exp_val) { u32 val; @@ -219,35 +235,46 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp); u32 val, gpr1, gpr12; - /* - * If the bootloader already enabled the link we need some special - * handling to get the core back into a state where it is safe to - * touch it for configuration. As there is no dedicated reset signal - * wired up for MX6QDL, we need to manually force LTSSM into "detect" - * state before completely disabling LTSSM, which is a prerequisite - * for core configuration. - * - * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong - * indication that the bootloader activated the link. - */ - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1); - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12); - - if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) && - (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) { - val = readl(pp->dbi_base + PCIE_PL_PFLR); - val &= ~PCIE_PL_PFLR_LINK_STATE_MASK; - val |= PCIE_PL_PFLR_FORCE_LINK; - writel(val, pp->dbi_base + PCIE_PL_PFLR); - + if (is_imx6sx_pcie(imx6_pcie)) { regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); - } + IMX6SX_GPR12_PCIE_TEST_PD, + IMX6SX_GPR12_PCIE_TEST_PD); + /* Force PCIe PHY reset */ + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, + IMX6SX_GPR5_PCIE_BTNRST, + IMX6SX_GPR5_PCIE_BTNRST); + } else { + /* + * If the bootloader already enabled the link we need some + * special handling to get the core back into a state where + * it is safe to touch it for configuration. As there is no + * dedicated reset signal to manually force LTSSM into "detect" + * state before completely disabling LTSSM, which is a + * prerequisite for core configuration. + * + * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have + * a strong indication that the bootloader activated the link. + */ + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1); + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12); + + if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) && + (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) { + val = readl(pp->dbi_base + PCIE_PL_PFLR); + val &= ~PCIE_PL_PFLR_LINK_STATE_MASK; + val |= PCIE_PL_PFLR_FORCE_LINK; + writel(val, pp->dbi_base + PCIE_PL_PFLR); + + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6Q_GPR12_PCIE_CTL_2, 0); + } - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_TEST_PD, + IMX6Q_GPR1_PCIE_TEST_PD); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_REF_CLK_EN, 0); + } return 0; } @@ -275,18 +302,30 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) goto err_pcie; } - /* power up core phy and enable ref clock */ - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18); - /* - * the async reset input need ref clock to sync internally, - * when the ref clock comes after reset, internal synced - * reset time is too short , cannot meet the requirement. - * add one ~10us delay here. - */ - udelay(10); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16); + if (is_imx6sx_pcie(imx6_pcie)) { + ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi); + if (ret) { + dev_err(pp->dev, "unable to enable pcie clock\n"); + goto err_inbound_axi; + } + + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6SX_GPR12_PCIE_TEST_PD, 0); + } else { + /* power up core phy and enable ref clock */ + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_TEST_PD, 0); + /* + * the async reset input need ref clock to sync internally, + * when the ref clock comes after reset, internal synced + * reset time is too short , cannot meet the requirement. + * add one ~10us delay here. + */ + udelay(10); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_REF_CLK_EN, + IMX6Q_GPR1_PCIE_REF_CLK_EN); + } /* allow the clocks to stabilize */ usleep_range(200, 500); @@ -297,8 +336,19 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) msleep(100); gpio_set_value(imx6_pcie->reset_gpio, 1); } + + /* + * Release the PCIe PHY reset here, that we have set in + * imx6_pcie_assert_core_reset() now + */ + if (is_imx6sx_pcie(imx6_pcie)) + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, + IMX6SX_GPR5_PCIE_BTNRST, 0); + return 0; +err_inbound_axi: + clk_disable_unprepare(imx6_pcie->pcie); err_pcie: clk_disable_unprepare(imx6_pcie->pcie_bus); err_pcie_bus: @@ -308,9 +358,26 @@ err_pcie_phy: } -static void imx6_pcie_init_phy(struct pcie_port *pp) +static int imx6_pcie_init_phy(struct pcie_port *pp) { struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp); + int ret; + + /* Power up the separate domain available on i.MX6SX */ + if (is_imx6sx_pcie(imx6_pcie)) { + regmap_update_bits(imx6_pcie->gpc_ips_reg, GPC_CNTR, + GPC_CNTR_PCIE_PHY_PUP_REQ, + GPC_CNTR_PCIE_PHY_PUP_REQ); + regulator_set_voltage(imx6_pcie->pcie_phy_regulator, + 1100000, 1100000); + ret = regulator_enable(imx6_pcie->pcie_phy_regulator); + if (ret) { + dev_err(pp->dev, "failed to enable pcie regulator.\n"); + return ret; + } + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6SX_GPR12_RX_EQ_MASK, IMX6SX_GPR12_RX_EQ_2); + } regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); @@ -319,7 +386,7 @@ static void imx6_pcie_init_phy(struct pcie_port *pp) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6Q_GPR12_DEVICE_TYPE, PCI_EXP_TYPE_ROOT_PORT << 12); regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_LOS_LEVEL, 9 << 4); + IMX6Q_GPR12_LOS_LEVEL, IMX6Q_GPR12_LOS_LEVEL_9); regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, IMX6Q_GPR8_TX_DEEMPH_GEN1, 0 << 0); @@ -331,6 +398,8 @@ static void imx6_pcie_init_phy(struct pcie_port *pp) IMX6Q_GPR8_TX_SWING_FULL, 127 << 18); regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, IMX6Q_GPR8_TX_SWING_LOW, 127 << 25); + + return 0; } static int imx6_pcie_wait_for_link(struct pcie_port *pp) @@ -377,7 +446,8 @@ static int imx6_pcie_start_link(struct pcie_port *pp) /* Start LTSSM. */ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_PCIE_CTL_2, 1 << 10); + IMX6Q_GPR12_PCIE_CTL_2, + IMX6Q_GPR12_PCIE_CTL_2); ret = imx6_pcie_wait_for_link(pp); if (ret) @@ -422,13 +492,19 @@ static int imx6_pcie_start_link(struct pcie_port *pp) return ret; } -static void imx6_pcie_host_init(struct pcie_port *pp) +static int imx6_pcie_host_init(struct pcie_port *pp) { + int ret; + imx6_pcie_assert_core_reset(pp); - imx6_pcie_init_phy(pp); + ret = imx6_pcie_init_phy(pp); + if (ret < 0) + return ret; - imx6_pcie_deassert_core_reset(pp); + ret = imx6_pcie_deassert_core_reset(pp); + if (ret < 0) + return ret; dw_pcie_setup_rc(pp); @@ -436,6 +512,8 @@ static void imx6_pcie_host_init(struct pcie_port *pp) if (IS_ENABLED(CONFIG_PCI_MSI)) dw_pcie_msi_init(pp); + + return 0; } static void imx6_pcie_reset_phy(struct pcie_port *pp) @@ -553,6 +631,76 @@ static int __init imx6_add_pcie_port(struct pcie_port *pp, return 0; } +#ifdef CONFIG_PM_SLEEP +static int pci_imx_suspend_noirq(struct device *dev) +{ + struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev); + struct pcie_port *pp = &imx6_pcie->pp; + + if (is_imx6sx_pcie(imx6_pcie)) { + if (IS_ENABLED(CONFIG_PCI_MSI)) + dw_pcie_msi_cfg_store(pp); + + /* PM_TURN_OFF */ + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6SX_GPR12_PCIE_PM_TURN_OFF, + IMX6SX_GPR12_PCIE_PM_TURN_OFF); + udelay(10); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6SX_GPR12_PCIE_PM_TURN_OFF, 0); + clk_disable_unprepare(imx6_pcie->pcie); + clk_disable_unprepare(imx6_pcie->pcie_bus); + clk_disable_unprepare(imx6_pcie->pcie_phy); + clk_disable_unprepare(imx6_pcie->pcie_inbound_axi); + + /* Assert per-reset to ep */ + gpio_set_value(imx6_pcie->reset_gpio, 0); + } + + return 0; +} + +static int pci_imx_resume_noirq(struct device *dev) +{ + struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev); + struct pcie_port *pp = &imx6_pcie->pp; + + if (is_imx6sx_pcie(imx6_pcie)) { + clk_prepare_enable(imx6_pcie->pcie_inbound_axi); + clk_prepare_enable(imx6_pcie->pcie_bus); + clk_prepare_enable(imx6_pcie->pcie_phy); + clk_prepare_enable(imx6_pcie->pcie); + + /* Reset iMX6SX PCIe */ + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, + IMX6SX_GPR5_PCIE_PERST, IMX6SX_GPR5_PCIE_PERST); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, + IMX6SX_GPR5_PCIE_PERST, 0); + /* + * controller maybe turn off, re-configure again + */ + dw_pcie_setup_rc(pp); + + if (IS_ENABLED(CONFIG_PCI_MSI)) + dw_pcie_msi_cfg_restore(pp); + + /* De-assert per-reset to ep */ + gpio_set_value(imx6_pcie->reset_gpio, 1); + } + + return 0; +} + +static const struct dev_pm_ops pci_imx_pm_ops = { + .suspend_noirq = pci_imx_suspend_noirq, + .resume_noirq = pci_imx_resume_noirq, + .freeze_noirq = pci_imx_suspend_noirq, + .thaw_noirq = pci_imx_resume_noirq, + .poweroff_noirq = pci_imx_suspend_noirq, + .restore_noirq = pci_imx_resume_noirq, +}; +#endif + static int __init imx6_pcie_probe(struct platform_device *pdev) { struct imx6_pcie *imx6_pcie; @@ -610,9 +758,28 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) return PTR_ERR(imx6_pcie->pcie); } - /* Grab GPR config register range */ - imx6_pcie->iomuxc_gpr = - syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr"); + if (is_imx6sx_pcie(imx6_pcie)) { + imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev, + "pcie_inbound_axi"); + if (IS_ERR(imx6_pcie->pcie_inbound_axi)) { + dev_err(&pdev->dev, + "pcie clock source missing or invalid\n"); + return PTR_ERR(imx6_pcie->pcie_inbound_axi); + } + + imx6_pcie->pcie_phy_regulator = devm_regulator_get(pp->dev, + "pcie-phy"); + + imx6_pcie->iomuxc_gpr = + syscon_regmap_lookup_by_compatible + ("fsl,imx6sx-iomuxc-gpr"); + imx6_pcie->gpc_ips_reg = + syscon_regmap_lookup_by_compatible("fsl,imx6sx-gpc"); + } else { + imx6_pcie->iomuxc_gpr = + syscon_regmap_lookup_by_compatible + ("fsl,imx6q-iomuxc-gpr"); + } if (IS_ERR(imx6_pcie->iomuxc_gpr)) { dev_err(&pdev->dev, "unable to find iomuxc registers\n"); return PTR_ERR(imx6_pcie->iomuxc_gpr); @@ -636,6 +803,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev) static const struct of_device_id imx6_pcie_of_match[] = { { .compatible = "fsl,imx6q-pcie", }, + { .compatible = "fsl,imx6sx-pcie", }, {}, }; MODULE_DEVICE_TABLE(of, imx6_pcie_of_match); @@ -645,6 +813,7 @@ static struct platform_driver imx6_pcie_driver = { .name = "imx6q-pcie", .owner = THIS_MODULE, .of_match_table = imx6_pcie_of_match, + .pm = &pci_imx_pm_ops, }, .shutdown = imx6_pcie_shutdown, };