From: "Z.q. Hou" <zhiqiang.hou@nxp.com>
To: Andrew Murray <amurray@thegoodpenguin.co.uk>
Cc: "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"andrew.murray@arm.com" <andrew.murray@arm.com>,
"arnd@arndb.de" <arnd@arndb.de>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"l.subrahmanya@mobiveil.co.in" <l.subrahmanya@mobiveil.co.in>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"m.karthikeyan@mobiveil.co.in" <m.karthikeyan@mobiveil.co.in>,
Leo Li <leoyang.li@nxp.com>,
"lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
"will.deacon@arm.com" <will.deacon@arm.com>,
Mingkai Hu <mingkai.hu@nxp.com>,
"M.h. Lian" <minghuan.lian@nxp.com>,
Xiaowei Bao <xiaowei.bao@nxp.com>
Subject: RE: [PATCHv10 11/13] PCI: mobiveil: Add PCIe Gen4 RC driver for NXP Layerscape SoCs
Date: Mon, 24 Feb 2020 05:50:45 +0000 [thread overview]
Message-ID: <DB8PR04MB67476E5DF5946784B9E924D084EC0@DB8PR04MB6747.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20200220174314.GK19388@big-machine>
Hi Andrew,
Thanks a lot for your review!
Thanks,
Zhiqiang
> -----Original Message-----
> From: Andrew Murray <amurray@thegoodpenguin.co.uk>
> Sent: 2020年2月21日 1:43
> To: Z.q. Hou <zhiqiang.hou@nxp.com>
> Cc: 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; Leo Li
> <leoyang.li@nxp.com>; lorenzo.pieralisi@arm.com;
> catalin.marinas@arm.com; will.deacon@arm.com; Mingkai Hu
> <mingkai.hu@nxp.com>; M.h. Lian <minghuan.lian@nxp.com>; Xiaowei Bao
> <xiaowei.bao@nxp.com>
> Subject: Re: [PATCHv10 11/13] PCI: mobiveil: Add PCIe Gen4 RC driver for
> NXP Layerscape SoCs
>
> On Thu, Feb 13, 2020 at 12:06:42PM +0800, Zhiqiang Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> >
> > 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 <Zhiqiang.Hou@nxp.com>
> > Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>
>
> Reviewed-by: Andrew Murray <amurray@thegoodpenguin.co.uk>
>
> > ---
> > 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 <Zhiqiang.Hou@nxp.com> */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/init.h>
> > +#include <linux/of_pci.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/of_irq.h>
> > +#include <linux/of_address.h>
> > +#include <linux/pci.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/resource.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/regmap.h>
> > +
> > +#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
> >
next prev parent reply other threads:[~2020-02-24 5:50 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 4:06 [PATCHv10 00/13] PCI: Recode Mobiveil driver and add PCIe Gen4 driver for NXP Layerscape SoCs Zhiqiang Hou
2020-02-13 4:06 ` [PATCHv10 01/13] PCI: mobiveil: Introduce a new structure mobiveil_root_port Zhiqiang Hou
2020-02-20 17:12 ` Andrew Murray
2020-02-24 5:45 ` Z.q. Hou
2020-02-13 4:06 ` [PATCHv10 02/13] PCI: mobiveil: Move the host initialization into a function Zhiqiang Hou
2020-02-20 17:19 ` Andrew Murray
2020-02-24 5:48 ` Z.q. Hou
2020-02-21 12:15 ` Lorenzo Pieralisi
2020-02-13 4:06 ` [PATCHv10 03/13] PCI: mobiveil: Collect the interrupt related operations " Zhiqiang Hou
2020-02-20 17:23 ` Andrew Murray
2020-02-24 5:49 ` Z.q. Hou
2020-02-13 4:06 ` [PATCHv10 04/13] PCI: mobiveil: Modularize the Mobiveil PCIe Host Bridge IP driver Zhiqiang Hou
2020-02-13 4:06 ` [PATCHv10 05/13] PCI: mobiveil: Add callback function for interrupt initialization Zhiqiang Hou
2020-02-20 17:25 ` Andrew Murray
2020-02-24 5:49 ` Z.q. Hou
2020-02-13 4:06 ` [PATCHv10 06/13] PCI: mobiveil: Add callback function for link up check Zhiqiang Hou
2020-02-13 4:06 ` [PATCHv10 07/13] PCI: mobiveil: Allow mobiveil_host_init() to be used to re-init host Zhiqiang Hou
2020-02-20 17:28 ` Andrew Murray
2020-02-24 5:49 ` Z.q. Hou
2020-02-13 4:06 ` [PATCHv10 08/13] PCI: mobiveil: Add 8-bit and 16-bit CSR register accessors Zhiqiang Hou
2020-02-20 17:29 ` Andrew Murray
2020-02-24 5:50 ` Z.q. Hou
2020-02-13 4:06 ` [PATCHv10 09/13] PCI: mobiveil: Add Header Type field check Zhiqiang Hou
2020-02-20 17:31 ` Andrew Murray
2020-02-24 5:50 ` Z.q. Hou
2020-02-13 4:06 ` [PATCHv10 10/13] dt-bindings: PCI: Add NXP Layerscape SoCs PCIe Gen4 controller Zhiqiang Hou
2020-02-13 4:06 ` [PATCHv10 11/13] PCI: mobiveil: Add PCIe Gen4 RC driver for NXP Layerscape SoCs Zhiqiang Hou
2020-02-20 17:43 ` Andrew Murray
2020-02-24 5:50 ` Z.q. Hou [this message]
2020-02-21 12:17 ` Lorenzo Pieralisi
2020-02-24 5:58 ` Z.q. Hou
2020-02-13 4:06 ` [PATCHv10 12/13] arm64: dts: lx2160a: Add PCIe controller DT nodes Zhiqiang Hou
2020-02-24 1:28 ` Shawn Guo
2020-02-24 6:11 ` Z.q. Hou
2020-02-13 4:06 ` [PATCHv10 13/13] arm64: defconfig: Enable CONFIG_PCIE_LAYERSCAPE_GEN4 Zhiqiang Hou
2020-02-24 1:29 ` Shawn Guo
2020-02-21 12:19 ` [PATCHv10 00/13] PCI: Recode Mobiveil driver and add PCIe Gen4 driver for NXP Layerscape SoCs Lorenzo Pieralisi
2020-02-24 6:07 ` Z.q. Hou
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