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Thu, 13 Feb 2020 04:10:50 +0000 From: Zhiqiang Hou To: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, bhelgaas@google.com, robh+dt@kernel.org, andrew.murray@arm.com, arnd@arndb.de, mark.rutland@arm.com, l.subrahmanya@mobiveil.co.in, shawnguo@kernel.org, m.karthikeyan@mobiveil.co.in, leoyang.li@nxp.com, lorenzo.pieralisi@arm.com, catalin.marinas@arm.com, will.deacon@arm.com Cc: Mingkai.Hu@nxp.com, Minghuan.Lian@nxp.com, Xiaowei.Bao@nxp.com, Hou Zhiqiang Subject: [PATCHv10 11/13] PCI: mobiveil: Add PCIe Gen4 RC driver for NXP Layerscape SoCs Date: Thu, 13 Feb 2020 12:06:42 +0800 Message-Id: <20200213040644.45858-12-Zhiqiang.Hou@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200213040644.45858-1-Zhiqiang.Hou@nxp.com> References: <20200213040644.45858-1-Zhiqiang.Hou@nxp.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: HK2PR04CA0069.apcprd04.prod.outlook.com (2603:1096:202:15::13) To DB8PR04MB6747.eurprd04.prod.outlook.com (2603:10a6:10:10b::31) MIME-Version: 1.0 Received: from localhost.localdomain (119.31.174.73) by HK2PR04CA0069.apcprd04.prod.outlook.com (2603:1096:202:15::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2729.24 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData: gEr44q+bUelgsMe8cnM9TdCscz3I4FgrjIbwRHNUrUAOQt0qiZcxledvZCZr6jr09LatbvqQhmLJGu/zMNXgPOYRn+rVq1FrAV1d1GP2sn+JrhXpQU3JQASDwkcCLpftLrkeTeRUfGeV3yZbhjj1hA== X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: c7ff05dd-6f88-4660-3649-08d7b03ab5d5 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2020 04:10:50.5543 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: i+6bvmQC2eO0nLQuDEmDNy1EDYKj/Pk17ZGRJQACGFGGRbm4tlJusXJvyMLNzTSWrBHDXqv61VgwHbp3P3iWNQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR04MB5660 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Hou Zhiqiang This PCIe controller is based on the Mobiveil GPEX IP, which is compatible with the PCI Express™ Base Specification, Revision 4.0. Signed-off-by: Hou Zhiqiang Reviewed-by: Minghuan Lian --- V10: - Changed the return type of ls_pcie_g4_reinit_hw() to void. - Moved Header Type check to mobiveil_pcie_host_probe(). drivers/pci/controller/mobiveil/Kconfig | 9 + drivers/pci/controller/mobiveil/Makefile | 1 + .../mobiveil/pcie-layerscape-gen4.c | 267 ++++++++++++++++++ .../pci/controller/mobiveil/pcie-mobiveil.h | 16 +- 4 files changed, 291 insertions(+), 2 deletions(-) create mode 100644 drivers/pci/controller/mobiveil/pcie-layerscape-gen4.c diff --git a/drivers/pci/controller/mobiveil/Kconfig b/drivers/pci/controller/mobiveil/Kconfig index 54161d4ddb11..7439991ee82c 100644 --- a/drivers/pci/controller/mobiveil/Kconfig +++ b/drivers/pci/controller/mobiveil/Kconfig @@ -21,4 +21,13 @@ config PCIE_MOBIVEIL_PLAT Soft IP. It has up to 8 outbound and inbound windows for address translation and it is a PCIe Gen4 IP. +config PCIE_LAYERSCAPE_GEN4 + bool "Freescale Layerscape PCIe Gen4 controller" + depends on PCI + depends on OF && (ARM64 || ARCH_LAYERSCAPE) + depends on PCI_MSI_IRQ_DOMAIN + select PCIE_MOBIVEIL_HOST + help + Say Y here if you want PCIe Gen4 controller support on + Layerscape SoCs. endmenu diff --git a/drivers/pci/controller/mobiveil/Makefile b/drivers/pci/controller/mobiveil/Makefile index 9fb6d1c6504d..99d879de32d6 100644 --- a/drivers/pci/controller/mobiveil/Makefile +++ b/drivers/pci/controller/mobiveil/Makefile @@ -2,3 +2,4 @@ obj-$(CONFIG_PCIE_MOBIVEIL) += pcie-mobiveil.o obj-$(CONFIG_PCIE_MOBIVEIL_HOST) += pcie-mobiveil-host.o obj-$(CONFIG_PCIE_MOBIVEIL_PLAT) += pcie-mobiveil-plat.o +obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4) += pcie-layerscape-gen4.o diff --git a/drivers/pci/controller/mobiveil/pcie-layerscape-gen4.c b/drivers/pci/controller/mobiveil/pcie-layerscape-gen4.c new file mode 100644 index 000000000000..f3bd5f5ad229 --- /dev/null +++ b/drivers/pci/controller/mobiveil/pcie-layerscape-gen4.c @@ -0,0 +1,267 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCIe Gen4 host controller driver for NXP Layerscape SoCs + * + * Copyright 2019-2020 NXP + * + * Author: Zhiqiang Hou + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "pcie-mobiveil.h" + +/* LUT and PF control registers */ +#define PCIE_LUT_OFF 0x80000 +#define PCIE_PF_OFF 0xc0000 +#define PCIE_PF_INT_STAT 0x18 +#define PF_INT_STAT_PABRST BIT(31) + +#define PCIE_PF_DBG 0x7fc +#define PF_DBG_LTSSM_MASK 0x3f +#define PF_DBG_LTSSM_L0 0x2d /* L0 state */ +#define PF_DBG_WE BIT(31) +#define PF_DBG_PABR BIT(27) + +#define to_ls_pcie_g4(x) platform_get_drvdata((x)->pdev) + +struct ls_pcie_g4 { + struct mobiveil_pcie pci; + struct delayed_work dwork; + int irq; +}; + +static inline u32 ls_pcie_g4_lut_readl(struct ls_pcie_g4 *pcie, u32 off) +{ + return ioread32(pcie->pci.csr_axi_slave_base + PCIE_LUT_OFF + off); +} + +static inline void ls_pcie_g4_lut_writel(struct ls_pcie_g4 *pcie, + u32 off, u32 val) +{ + iowrite32(val, pcie->pci.csr_axi_slave_base + PCIE_LUT_OFF + off); +} + +static inline u32 ls_pcie_g4_pf_readl(struct ls_pcie_g4 *pcie, u32 off) +{ + return ioread32(pcie->pci.csr_axi_slave_base + PCIE_PF_OFF + off); +} + +static inline void ls_pcie_g4_pf_writel(struct ls_pcie_g4 *pcie, + u32 off, u32 val) +{ + iowrite32(val, pcie->pci.csr_axi_slave_base + PCIE_PF_OFF + off); +} + +static int ls_pcie_g4_link_up(struct mobiveil_pcie *pci) +{ + struct ls_pcie_g4 *pcie = to_ls_pcie_g4(pci); + u32 state; + + state = ls_pcie_g4_pf_readl(pcie, PCIE_PF_DBG); + state = state & PF_DBG_LTSSM_MASK; + + if (state == PF_DBG_LTSSM_L0) + return 1; + + return 0; +} + +static void ls_pcie_g4_disable_interrupt(struct ls_pcie_g4 *pcie) +{ + struct mobiveil_pcie *mv_pci = &pcie->pci; + + mobiveil_csr_writel(mv_pci, 0, PAB_INTP_AMBA_MISC_ENB); +} + +static void ls_pcie_g4_enable_interrupt(struct ls_pcie_g4 *pcie) +{ + struct mobiveil_pcie *mv_pci = &pcie->pci; + u32 val; + + /* Clear the interrupt status */ + mobiveil_csr_writel(mv_pci, 0xffffffff, PAB_INTP_AMBA_MISC_STAT); + + val = PAB_INTP_INTX_MASK | PAB_INTP_MSI | PAB_INTP_RESET | + PAB_INTP_PCIE_UE | PAB_INTP_IE_PMREDI | PAB_INTP_IE_EC; + mobiveil_csr_writel(mv_pci, val, PAB_INTP_AMBA_MISC_ENB); +} + +static int ls_pcie_g4_reinit_hw(struct ls_pcie_g4 *pcie) +{ + struct mobiveil_pcie *mv_pci = &pcie->pci; + struct device *dev = &mv_pci->pdev->dev; + u32 val, act_stat; + int to = 100; + + /* Poll for pab_csb_reset to set and PAB activity to clear */ + do { + usleep_range(10, 15); + val = ls_pcie_g4_pf_readl(pcie, PCIE_PF_INT_STAT); + act_stat = mobiveil_csr_readl(mv_pci, PAB_ACTIVITY_STAT); + } while (((val & PF_INT_STAT_PABRST) == 0 || act_stat) && to--); + if (to < 0) { + dev_err(dev, "Poll PABRST&PABACT timeout\n"); + return -EIO; + } + + /* clear PEX_RESET bit in PEX_PF0_DBG register */ + val = ls_pcie_g4_pf_readl(pcie, PCIE_PF_DBG); + val |= PF_DBG_WE; + ls_pcie_g4_pf_writel(pcie, PCIE_PF_DBG, val); + + val = ls_pcie_g4_pf_readl(pcie, PCIE_PF_DBG); + val |= PF_DBG_PABR; + ls_pcie_g4_pf_writel(pcie, PCIE_PF_DBG, val); + + val = ls_pcie_g4_pf_readl(pcie, PCIE_PF_DBG); + val &= ~PF_DBG_WE; + ls_pcie_g4_pf_writel(pcie, PCIE_PF_DBG, val); + + mobiveil_host_init(mv_pci, true); + + to = 100; + while (!ls_pcie_g4_link_up(mv_pci) && to--) + usleep_range(200, 250); + if (to < 0) { + dev_err(dev, "PCIe link training timeout\n"); + return -EIO; + } + + return 0; +} + +static irqreturn_t ls_pcie_g4_isr(int irq, void *dev_id) +{ + struct ls_pcie_g4 *pcie = (struct ls_pcie_g4 *)dev_id; + struct mobiveil_pcie *mv_pci = &pcie->pci; + u32 val; + + val = mobiveil_csr_readl(mv_pci, PAB_INTP_AMBA_MISC_STAT); + if (!val) + return IRQ_NONE; + + if (val & PAB_INTP_RESET) { + ls_pcie_g4_disable_interrupt(pcie); + schedule_delayed_work(&pcie->dwork, msecs_to_jiffies(1)); + } + + mobiveil_csr_writel(mv_pci, val, PAB_INTP_AMBA_MISC_STAT); + + return IRQ_HANDLED; +} + +static int ls_pcie_g4_interrupt_init(struct mobiveil_pcie *mv_pci) +{ + struct ls_pcie_g4 *pcie = to_ls_pcie_g4(mv_pci); + struct platform_device *pdev = mv_pci->pdev; + struct device *dev = &pdev->dev; + int ret; + + pcie->irq = platform_get_irq_byname(pdev, "intr"); + if (pcie->irq < 0) { + dev_err(dev, "Can't get 'intr' IRQ, errno = %d\n", pcie->irq); + return pcie->irq; + } + ret = devm_request_irq(dev, pcie->irq, ls_pcie_g4_isr, + IRQF_SHARED, pdev->name, pcie); + if (ret) { + dev_err(dev, "Can't register PCIe IRQ, errno = %d\n", ret); + return ret; + } + + return 0; +} + +static void ls_pcie_g4_reset(struct work_struct *work) +{ + struct delayed_work *dwork = container_of(work, struct delayed_work, + work); + struct ls_pcie_g4 *pcie = container_of(dwork, struct ls_pcie_g4, dwork); + struct mobiveil_pcie *mv_pci = &pcie->pci; + u16 ctrl; + + ctrl = mobiveil_csr_readw(mv_pci, PCI_BRIDGE_CONTROL); + ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET; + mobiveil_csr_writew(mv_pci, ctrl, PCI_BRIDGE_CONTROL); + + if (!ls_pcie_g4_reinit_hw(pcie)) + return; + + ls_pcie_g4_enable_interrupt(pcie); +} + +static struct mobiveil_rp_ops ls_pcie_g4_rp_ops = { + .interrupt_init = ls_pcie_g4_interrupt_init, +}; + +static const struct mobiveil_pab_ops ls_pcie_g4_pab_ops = { + .link_up = ls_pcie_g4_link_up, +}; + +static int __init ls_pcie_g4_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct pci_host_bridge *bridge; + struct mobiveil_pcie *mv_pci; + struct ls_pcie_g4 *pcie; + struct device_node *np = dev->of_node; + int ret; + + if (!of_parse_phandle(np, "msi-parent", 0)) { + dev_err(dev, "Failed to find msi-parent\n"); + return -EINVAL; + } + + bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie)); + if (!bridge) + return -ENOMEM; + + pcie = pci_host_bridge_priv(bridge); + mv_pci = &pcie->pci; + + mv_pci->pdev = pdev; + mv_pci->ops = &ls_pcie_g4_pab_ops; + mv_pci->rp.ops = &ls_pcie_g4_rp_ops; + mv_pci->rp.bridge = bridge; + + platform_set_drvdata(pdev, pcie); + + INIT_DELAYED_WORK(&pcie->dwork, ls_pcie_g4_reset); + + ret = mobiveil_pcie_host_probe(mv_pci); + if (ret) { + dev_err(dev, "Fail to probe\n"); + return ret; + } + + ls_pcie_g4_enable_interrupt(pcie); + + return 0; +} + +static const struct of_device_id ls_pcie_g4_of_match[] = { + { .compatible = "fsl,lx2160a-pcie", }, + { }, +}; + +static struct platform_driver ls_pcie_g4_driver = { + .driver = { + .name = "layerscape-pcie-gen4", + .of_match_table = ls_pcie_g4_of_match, + .suppress_bind_attrs = true, + }, +}; + +builtin_platform_driver_probe(ls_pcie_g4_driver, ls_pcie_g4_probe); diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h b/drivers/pci/controller/mobiveil/pcie-mobiveil.h index 72c62b4d8f7b..7b6a403a9fc0 100644 --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h @@ -43,6 +43,8 @@ #define PAGE_LO_MASK 0x3ff #define PAGE_SEL_OFFSET_SHIFT 10 +#define PAB_ACTIVITY_STAT 0x81c + #define PAB_AXI_PIO_CTRL 0x0840 #define APIO_EN_MASK 0xf @@ -51,8 +53,18 @@ #define PAB_INTP_AMBA_MISC_ENB 0x0b0c #define PAB_INTP_AMBA_MISC_STAT 0x0b1c -#define PAB_INTP_INTX_MASK 0x01e0 -#define PAB_INTP_MSI_MASK 0x8 +#define PAB_INTP_RESET BIT(1) +#define PAB_INTP_MSI BIT(3) +#define PAB_INTP_INTA BIT(5) +#define PAB_INTP_INTB BIT(6) +#define PAB_INTP_INTC BIT(7) +#define PAB_INTP_INTD BIT(8) +#define PAB_INTP_PCIE_UE BIT(9) +#define PAB_INTP_IE_PMREDI BIT(29) +#define PAB_INTP_IE_EC BIT(30) +#define PAB_INTP_MSI_MASK PAB_INTP_MSI +#define PAB_INTP_INTX_MASK (PAB_INTP_INTA | PAB_INTP_INTB |\ + PAB_INTP_INTC | PAB_INTP_INTD) #define PAB_AXI_AMAP_CTRL(win) PAB_REG_ADDR(0x0ba0, win) #define WIN_ENABLE_SHIFT 0 -- 2.17.1