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Date: Mon, 16 Oct 2023 22:37:06 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Frank Li <Frank.Li@....com>
Cc: Minghuan Lian <minghuan.Lian@....com>,
Mingkai Hu <mingkai.hu@....com>, Roy Zang <roy.zang@....com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Rob Herring <robh@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
"open list:PCI DRIVER FOR FREESCALE LAYERSCAPE"
<linuxppc-dev@...ts.ozlabs.org>,
"open list:PCI DRIVER FOR FREESCALE LAYERSCAPE"
<linux-pci@...r.kernel.org>,
"moderated list:PCI DRIVER FOR FREESCALE LAYERSCAPE"
<linux-arm-kernel@...ts.infradead.org>,
open list <linux-kernel@...r.kernel.org>, imx@...ts.linux.dev
Subject: Re: [PATCH 3/3] PCI: layerscape: add suspend/resume for ls1043a
On Fri, Sep 15, 2023 at 02:43:06PM -0400, Frank Li wrote:
> ls1043a add suspend/resume support.
>
Same comment as previous patch for patch description.
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> drivers/pci/controller/dwc/pci-layerscape.c | 91 ++++++++++++++++++++-
> 1 file changed, 90 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
> index bc5a8ff1a26ce..debabb9bb41f4 100644
> --- a/drivers/pci/controller/dwc/pci-layerscape.c
> +++ b/drivers/pci/controller/dwc/pci-layerscape.c
> @@ -41,10 +41,20 @@
> #define SCFG_PEXSFTRSTCR 0x190
> #define PEXSR(idx) BIT(idx)
>
> +/* LS1043A PEX PME control register */
> +#define SCFG_PEXPMECR 0x144
> +#define PEXPME(idx) BIT(31 - (idx) * 4)
> +
> +/* LS1043A PEX LUT debug register */
> +#define LS_PCIE_LDBG 0x7fc
> +#define LDBG_SR BIT(30)
> +#define LDBG_WE BIT(31)
> +
> #define PCIE_IATU_NUM 6
>
> struct ls_pcie_drvdata {
> const u32 pf_off;
> + const u32 lut_off;
> const struct dw_pcie_host_ops *ops;
> void (*exit_from_l2)(struct dw_pcie_rp *pp);
> bool pm_support;
> @@ -54,6 +64,7 @@ struct ls_pcie {
> struct dw_pcie *pci;
> const struct ls_pcie_drvdata *drvdata;
> void __iomem *pf_base;
> + void __iomem *lut_base;
> struct regmap *scfg;
> int index;
> bool big_endian;
> @@ -116,6 +127,23 @@ static void ls_pcie_pf_writel(struct ls_pcie *pcie, u32 off, u32 val)
> iowrite32(val, pcie->pf_base + off);
> }
>
> +static u32 ls_pcie_lut_readl(struct ls_pcie *pcie, u32 off)
> +{
Looking at ls_pcie_pf_{readl/writel} you can use a common function that does the
read/write and pass the relevant base/offset. This will avoid code duplication.
> + if (pcie->big_endian)
> + return ioread32be(pcie->lut_base + off);
> +
> + return ioread32(pcie->lut_base + off);
> +}
> +
> +static void ls_pcie_lut_writel(struct ls_pcie *pcie, u32 off, u32 val)
> +{
> + if (pcie->big_endian)
> + iowrite32be(val, pcie->lut_base + off);
> + else
> + iowrite32(val, pcie->lut_base + off);
> +}
> +
Remove extra newline
> +
> static void ls_pcie_send_turnoff_msg(struct dw_pcie_rp *pp)
> {
> struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> @@ -249,6 +277,54 @@ static int ls1021a_pcie_host_init(struct dw_pcie_rp *pp)
> return ret;
> }
>
> +static void ls1043a_pcie_send_turnoff_msg(struct dw_pcie_rp *pp)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> + struct ls_pcie *pcie = to_ls_pcie(pci);
> + u32 val;
> +
> + if (!pcie->scfg) {
> + dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n");
> + return;
> + }
> +
> + /* Send Turn_off message */
> + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
If the register offset is the only difference, then you could pass the register
offset via drvdata and use the same functions.
> + val |= PEXPME(pcie->index);
> + regmap_write(pcie->scfg, SCFG_PEXPMECR, val);
> +
> + /* There are not register to check ACK, so wait PCIE_PME_TO_L2_TIMEOUT_US */
> + mdelay(PCIE_PME_TO_L2_TIMEOUT_US/1000);
> +
> + /* Clear Turn_off message */
> + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
> + val &= ~PEXPME(pcie->index);
> + regmap_write(pcie->scfg, SCFG_PEXPMECR, val);
> +}
> +
> +static void ls1043a_pcie_exit_from_l2(struct dw_pcie_rp *pp)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> + struct ls_pcie *pcie = to_ls_pcie(pci);
> + u32 val;
> +
Again, a comment here would be useful.
- Mani
> + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> + val |= LDBG_WE;
> + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> +
> + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> + val |= LDBG_SR;
> + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> +
> + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> + val &= ~LDBG_SR;
> + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> +
> + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> + val &= ~LDBG_WE;
> + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> +}
> +
> static const struct dw_pcie_host_ops ls_pcie_host_ops = {
> .host_init = ls_pcie_host_init,
> .pme_turn_off = ls_pcie_send_turnoff_msg,
> @@ -265,6 +341,18 @@ static const struct ls_pcie_drvdata ls1021a_drvdata = {
> .exit_from_l2 = ls1021a_pcie_exit_from_l2,
> };
>
> +static const struct dw_pcie_host_ops ls1043a_pcie_host_ops = {
> + .host_init = ls1021a_pcie_host_init, /* the same as ls1021 */
> + .pme_turn_off = ls1043a_pcie_send_turnoff_msg,
> +};
> +
> +static const struct ls_pcie_drvdata ls1043a_drvdata = {
> + .lut_off = 0x10000,
> + .pm_support = true,
> + .ops = &ls1043a_pcie_host_ops,
> + .exit_from_l2 = ls1043a_pcie_exit_from_l2,
> +};
> +
> static const struct ls_pcie_drvdata layerscape_drvdata = {
> .pf_off = 0xc0000,
> .pm_support = true,
> @@ -275,7 +363,7 @@ static const struct of_device_id ls_pcie_of_match[] = {
> { .compatible = "fsl,ls1012a-pcie", .data = &layerscape_drvdata },
> { .compatible = "fsl,ls1021a-pcie", .data = &ls1021a_drvdata },
> { .compatible = "fsl,ls1028a-pcie", .data = &layerscape_drvdata },
> - { .compatible = "fsl,ls1043a-pcie", .data = &ls1021a_drvdata },
> + { .compatible = "fsl,ls1043a-pcie", .data = &ls1043a_drvdata },
> { .compatible = "fsl,ls1046a-pcie", .data = &layerscape_drvdata },
> { .compatible = "fsl,ls2080a-pcie", .data = &layerscape_drvdata },
> { .compatible = "fsl,ls2085a-pcie", .data = &layerscape_drvdata },
> @@ -314,6 +402,7 @@ static int ls_pcie_probe(struct platform_device *pdev)
> pcie->big_endian = of_property_read_bool(dev->of_node, "big-endian");
>
> pcie->pf_base = pci->dbi_base + pcie->drvdata->pf_off;
> + pcie->lut_base = pci->dbi_base + pcie->drvdata->lut_off;
>
> if (!ls_pcie_is_bridge(pcie))
> return -ENODEV;
> --
> 2.34.1
>
--
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