From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753564AbdASQiC (ORCPT ); Thu, 19 Jan 2017 11:38:02 -0500 Received: from mail-pf0-f194.google.com ([209.85.192.194]:33803 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753407AbdASQhp (ORCPT ); Thu, 19 Jan 2017 11:37:45 -0500 From: Andrey Smirnov To: linux-pci@vger.kernel.org Cc: Andrey Smirnov , yurovsky@gmail.com, Richard Zhu , Lucas Stach , Bjorn Helgaas , Fabio Estevam , Shawn Guo , Rob Herring , Mark Rutland , Lee Jones , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] PCI: imx6: Add code to support i.MX7D Date: Thu, 19 Jan 2017 08:36:31 -0800 Message-Id: <20170119163631.10668-4-andrew.smirnov@gmail.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170119163631.10668-1-andrew.smirnov@gmail.com> References: <20170119163631.10668-1-andrew.smirnov@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add various bits of code needed to support i.MX7D variant of the IP. Cc: yurovsky@gmail.com Cc: Richard Zhu Cc: Lucas Stach Cc: Bjorn Helgaas Cc: Fabio Estevam Cc: Shawn Guo Cc: Rob Herring Cc: Mark Rutland Cc: Lee Jones Cc: linux-arm-kernel@lists.infradead.org Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Andrey Smirnov --- .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 6 +- drivers/pci/host/pci-imx6.c | 188 ++++++++++++++++++--- include/linux/mfd/syscon/imx7-gpc.h | 18 ++ include/linux/mfd/syscon/imx7-iomuxc-gpr.h | 4 + include/linux/mfd/syscon/imx7-src.h | 18 ++ 5 files changed, 208 insertions(+), 26 deletions(-) create mode 100644 include/linux/mfd/syscon/imx7-gpc.h create mode 100644 include/linux/mfd/syscon/imx7-src.h diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt index 83aeb1f..20b9382 100644 --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt @@ -4,7 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP and thus inherits all the common properties defined in designware-pcie.txt. Required properties: -- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", "fsl,imx6qp-pcie" +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie", + "fsl,imx6qp-pcie", "fsl,imx7d-pcie" - reg: base address and length of the PCIe controller - interrupts: A list of interrupt outputs of the controller. Must contain an entry for each entry in the interrupt-names property. @@ -34,6 +35,9 @@ Additional required properties for imx6sx-pcie: - clock names: Must include the following additional entries: - "pcie_inbound_axi" +Additional required properties for imx7d-pcie: +- pcie-phy-supply: Should specify the regulator supplying PCIe PHY + Example: pcie@0x01000000 { diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 574f026..f29148e 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -17,6 +17,9 @@ #include #include #include +#include +#include +#include #include #include #include @@ -27,6 +30,7 @@ #include #include #include +#include #include "pcie-designware.h" @@ -36,6 +40,7 @@ enum imx6_pcie_variants { IMX6Q, IMX6SX, IMX6QP, + IMX7D, }; struct imx6_pcie { @@ -47,6 +52,8 @@ struct imx6_pcie { struct clk *pcie_inbound_axi; struct clk *pcie; struct regmap *iomuxc_gpr; + struct regmap *src; + struct regmap *gpc; enum imx6_pcie_variants variant; u32 tx_deemph_gen1; u32 tx_deemph_gen2_3p5db; @@ -54,8 +61,14 @@ struct imx6_pcie { u32 tx_swing_full; u32 tx_swing_low; int link_gen; + struct regulator *pcie_phy_regulator; }; +/* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */ +#define PHY_PLL_LOCK_WAIT_MAX_RETRIES 2000 +#define PHY_PLL_LOCK_WAIT_USLEEP_MIN 50 +#define PHY_PLL_LOCK_WAIT_USLEEP_MAX 200 + /* PCIe Root Complex registers (memory-mapped) */ #define PCIE_RC_LCR 0x7c #define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1 0x1 @@ -251,6 +264,16 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) u32 val, gpr1, gpr12; switch (imx6_pcie->variant) { + case IMX7D: + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_G_RST, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_G_RST); + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_BTN, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_BTN); + break; case IMX6SX: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_TEST_POWERDOWN, @@ -333,11 +356,33 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16); break; + case IMX7D: + break; } return ret; } +static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie) +{ + u32 val; + unsigned int retries; + struct pcie_port *pp = &imx6_pcie->pp; + struct device *dev = pp->dev; + + for (retries = 0; retries < PHY_PLL_LOCK_WAIT_MAX_RETRIES; retries++) { + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR22, &val); + + if (val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED) + return; + + usleep_range(PHY_PLL_LOCK_WAIT_USLEEP_MIN, + PHY_PLL_LOCK_WAIT_USLEEP_MAX); + } + + dev_err(dev, "PCIe PLL lock timeout\n"); +} + static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) { struct pcie_port *pp = &imx6_pcie->pp; @@ -381,6 +426,21 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) } switch (imx6_pcie->variant) { + case IMX7D: + /* wait for more than 10us to release phy g_rst and btnrst */ + udelay(10); + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIE_CTRL_APPS_EN, 0); + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_G_RST, 0); + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_BTN, 0); + + imx7d_pcie_wait_for_phy_pll_lock(imx6_pcie); + break; case IMX6SX: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, IMX6SX_GPR5_PCIE_BTNRST_RESET, 0); @@ -407,35 +467,80 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie) { - if (imx6_pcie->variant == IMX6SX) + switch (imx6_pcie->variant) { + case IMX7D: { + int ret; + unsigned int reg, mapping; + struct pcie_port *pp = &imx6_pcie->pp; + struct device *dev = pp->dev; + + regulator_set_voltage(imx6_pcie->pcie_phy_regulator, + 1000000, 1000000); + ret = regulator_enable(imx6_pcie->pcie_phy_regulator); + if (ret) { + dev_err(dev, "failed to enable pcie regulator.\n"); + return; + } + + /* + * Now that PHY regulator is enabled, do sofware + * power-up request by mapping PHY in A7 domain and + * setting power-up request bit + */ + regmap_read(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, &mapping); + regmap_write(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, + mapping | IMX7D_PCIE_PHY_A7_DOMAIN); + + regmap_update_bits(imx6_pcie->gpc, GPC_PU_PGC_SW_PUP_REQ, + IMX7D_PCIE_PHY_SW_PUP_REQ, + IMX7D_PCIE_PHY_SW_PUP_REQ); + /* + * As per "5.5.9.4 Example Code 4" in IMX7DRM.pdf wait + * for PUP_REQ bit to be cleared + */ + while (!regmap_read(imx6_pcie->gpc, + GPC_PU_PGC_SW_PUP_REQ, ®) && + reg & IMX7D_PCIE_PHY_SW_PUP_REQ) + ; + regmap_write(imx6_pcie->gpc, GPC_PGC_CPU_MAPPING, mapping); + + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0); + break; + } + case IMX6SX: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_RX_EQ_MASK, IMX6SX_GPR12_PCIE_RX_EQ_2); + /* FALLTHROUGH */ + default: + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); + /* configure constant input signal to the pcie ctrl and phy */ + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6Q_GPR12_LOS_LEVEL, 9 << 4); + + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_DEEMPH_GEN1, + imx6_pcie->tx_deemph_gen1 << 0); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB, + imx6_pcie->tx_deemph_gen2_3p5db << 6); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB, + imx6_pcie->tx_deemph_gen2_6db << 12); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_SWING_FULL, + imx6_pcie->tx_swing_full << 18); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, + IMX6Q_GPR8_TX_SWING_LOW, + imx6_pcie->tx_swing_low << 25); + break; + } - /* configure constant input signal to the pcie ctrl and phy */ 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); - - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_DEEMPH_GEN1, - imx6_pcie->tx_deemph_gen1 << 0); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB, - imx6_pcie->tx_deemph_gen2_3p5db << 6); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB, - imx6_pcie->tx_deemph_gen2_6db << 12); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_SWING_FULL, - imx6_pcie->tx_swing_full << 18); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8, - IMX6Q_GPR8_TX_SWING_LOW, - imx6_pcie->tx_swing_low << 25); } static int imx6_pcie_wait_for_link(struct imx6_pcie *imx6_pcie) @@ -498,8 +603,14 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie) dw_pcie_writel_rc(pp, PCIE_RC_LCR, tmp); /* Start LTSSM. */ - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_PCIE_CTL_2, 1 << 10); + if (imx6_pcie->variant == IMX7D) + regmap_update_bits(imx6_pcie->src, + SRC_PCIEPHY_RCR, + IMX7D_SRC_PCIEPHY_RCR_PCIE_CTRL_APPS_EN, + IMX7D_SRC_PCIEPHY_RCR_PCIE_CTRL_APPS_EN); + else + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6Q_GPR12_PCIE_CTL_2, 1 << 10); ret = imx6_pcie_wait_for_link(imx6_pcie); if (ret) { @@ -677,13 +788,39 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) return PTR_ERR(imx6_pcie->pcie); } - if (imx6_pcie->variant == IMX6SX) { + switch (imx6_pcie->variant) { + case IMX6SX: imx6_pcie->pcie_inbound_axi = devm_clk_get(dev, "pcie_inbound_axi"); if (IS_ERR(imx6_pcie->pcie_inbound_axi)) { dev_err(dev, "pcie_inbound_axi clock missing or invalid\n"); return PTR_ERR(imx6_pcie->pcie_inbound_axi); } + break; + case IMX7D: + imx6_pcie->src = + syscon_regmap_lookup_by_compatible("fsl,imx7d-src"); + if (IS_ERR(imx6_pcie->src)) { + dev_err(dev, "imx7d pcie phy src missing or invalid\n"); + return PTR_ERR(imx6_pcie->src); + } + + imx6_pcie->gpc = + syscon_regmap_lookup_by_compatible("fsl,imx7d-gpc"); + if (IS_ERR(imx6_pcie->gpc)) { + dev_err(dev, "unable to find gpc registers\n"); + return PTR_ERR(imx6_pcie->gpc); + } + + imx6_pcie->pcie_phy_regulator = devm_regulator_get(pp->dev, + "pcie-phy"); + if (IS_ERR(imx6_pcie->pcie_phy_regulator)) { + dev_err(dev, "imx7d pcie phy src missing or invalid\n"); + return PTR_ERR(imx6_pcie->pcie_phy_regulator); + } + break; + default: + break; } /* Grab GPR config register range */ @@ -741,6 +878,7 @@ static const struct of_device_id imx6_pcie_of_match[] = { { .compatible = "fsl,imx6q-pcie", .data = (void *)IMX6Q, }, { .compatible = "fsl,imx6sx-pcie", .data = (void *)IMX6SX, }, { .compatible = "fsl,imx6qp-pcie", .data = (void *)IMX6QP, }, + { .compatible = "fsl,imx7d-pcie", .data = (void *)IMX7D, }, {}, }; diff --git a/include/linux/mfd/syscon/imx7-gpc.h b/include/linux/mfd/syscon/imx7-gpc.h new file mode 100644 index 0000000..38e1c9a9 --- /dev/null +++ b/include/linux/mfd/syscon/imx7-gpc.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) 2017 Impinj + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __LINUX_IMX7_GPC_H +#define __LINUX_IMX7_GPC_H + +#define GPC_PGC_CPU_MAPPING 0xec +#define GPC_PU_PGC_SW_PUP_REQ 0xf8 + +#define IMX7D_PCIE_PHY_A7_DOMAIN BIT(3) +#define IMX7D_PCIE_PHY_SW_PUP_REQ BIT(1) + +#endif diff --git a/include/linux/mfd/syscon/imx7-iomuxc-gpr.h b/include/linux/mfd/syscon/imx7-iomuxc-gpr.h index 4585d61..abbd524 100644 --- a/include/linux/mfd/syscon/imx7-iomuxc-gpr.h +++ b/include/linux/mfd/syscon/imx7-iomuxc-gpr.h @@ -44,4 +44,8 @@ #define IMX7D_GPR5_CSI_MUX_CONTROL_MIPI (0x1 << 4) +#define IMX7D_GPR12_PCIE_PHY_REFCLK_SEL BIT(5) + +#define IMX7D_GPR22_PCIE_PHY_PLL_LOCKED BIT(31) + #endif /* __LINUX_IMX7_IOMUXC_GPR_H */ diff --git a/include/linux/mfd/syscon/imx7-src.h b/include/linux/mfd/syscon/imx7-src.h new file mode 100644 index 0000000..fdc4806 --- /dev/null +++ b/include/linux/mfd/syscon/imx7-src.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) 2017 Impinj + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __LINUX_IMX7_SRC_H +#define __LINUX_IMX7_SRC_H + +#define SRC_PCIEPHY_RCR 0x2c + +#define IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_G_RST BIT(1) +#define IMX7D_SRC_PCIEPHY_RCR_PCIEPHY_BTN BIT(2) +#define IMX7D_SRC_PCIEPHY_RCR_PCIE_CTRL_APPS_EN BIT(6) + +#endif /* __LINUX_IMX7_IOMUXC_GPR_H */ -- 2.9.3