Re: [PATCHv9 10/12] PCI: mobiveil: Add PCIe Gen4 RC driver for NXP Layerscape SoCs

From: Andrew Murray
Date: Mon Jan 13 2020 - 07:02:56 EST

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On Wed, Nov 20, 2019 at 03:46:23AM +0000, Z.q. Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
>
> This PCIe controller is based on the Mobiveil GPEX IP, which is
> compatible with the PCI Expressâ Base Specification, Revision 4.0.
>
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> Reviewed-by: Minghuan Lian <Minghuan.Lian@xxxxxxx>
> ---
> drivers/pci/controller/mobiveil/Kconfig | 10 +
> drivers/pci/controller/mobiveil/Makefile | 1 +
> .../mobiveil/pcie-layerscape-gen4.c | 274 ++++++++++++++++++
> .../pci/controller/mobiveil/pcie-mobiveil.h | 16 +-
> 4 files changed, 299 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 64343c07bfed..c823be8dab1c 100644
> --- a/drivers/pci/controller/mobiveil/Kconfig
> +++ b/drivers/pci/controller/mobiveil/Kconfig
> @@ -21,4 +21,14 @@ 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. The PCIe controller can work in RC or
> + EP mode according to RCW[HOST_AGT_PEX] setting.

I think you can remove the last sentence - it doesn't give any value
to users of KConfig.

> 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..6c0d3e2532db
> --- /dev/null
> +++ b/drivers/pci/controller/mobiveil/pcie-layerscape-gen4.c
> @@ -0,0 +1,274 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe Gen4 host controller driver for NXP Layerscape SoCs
> + *
> + * Copyright 2019 NXP
> + *
> + * Author: Zhiqiang Hou <Zhiqiang.Hou@xxxxxxx>
> + */
> +
> +#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 bool ls_pcie_g4_is_bridge(struct ls_pcie_g4 *pcie)
> +{
> + struct mobiveil_pcie *mv_pci = &pcie->pci;
> + u32 header_type;
> +
> + header_type = mobiveil_csr_readb(mv_pci, PCI_HEADER_TYPE);
> + header_type &= 0x7f;
> +
> + return header_type == PCI_HEADER_TYPE_BRIDGE;
> +}
> +
> +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 void 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;

If a timeout happens here - the caller has no idea this has happened
and yet the following work doesn't get done. Isn't this a problem?

> + }
> +
> + /* 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);

Can mobiveil_host_init fail?

> +
> + 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");
> +}
> +
> +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) {

Can you explain why this is needed (perhaps also in the cover letter)?

> + 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);
> + ls_pcie_g4_reinit_hw(pcie);
> + 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;
> + }
> +
> + if (!ls_pcie_g4_is_bridge(pcie))

Is this a check that could apply to all host bridge drivers and thus live
in mobiveil_pcie_host_probe?

> + return -ENODEV;
> +
> + ls_pcie_g4_enable_interrupt(pcie);

Is there an issue here in that we enable interrupts *after* telling the kernel
about our controller? (Same applies for bailing if the IP isn't a bridge).

Thanks,

Andrew Murray

> +
> + 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 750a7fd95bc1..c57a68d2bac4 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
>

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