[RESEND v4 12/14] PCI: imx6: Add i.MX8MQ PCIe EP support

Richard Zhu
2022-10-24T08:29:17Z

Add i.MX8MQ PCIe EP support.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
---
drivers/pci/controller/dwc/pci-imx6.c | 38 +++++++++++++++++++++++----
1 file changed, 33 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 31467a31128a..f40b23c7f3cb 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -52,6 +52,7 @@ enum imx6_pcie_variants {
IMX8MQ,
IMX8MM,
IMX8MP,
+ IMX8MQ_EP,
};

#define IMX6_PCIE_FLAG_IMX6_PHY BIT(0)
@@ -153,6 +154,7 @@ struct imx6_pcie {
static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
{
WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ &&
+ imx6_pcie->drvdata->variant != IMX8MQ_EP &&
imx6_pcie->drvdata->variant != IMX8MM &&
imx6_pcie->drvdata->variant != IMX8MP);
return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : IOMUXC_GPR14;
@@ -167,13 +169,22 @@ static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
else
mode = PCI_EXP_TYPE_ROOT_PORT;

- if (imx6_pcie->drvdata->variant == IMX8MQ &&
- imx6_pcie->controller_id == 1) {
- mask = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE;
- val = FIELD_PREP(IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE, mode);
- } else {
+ switch (imx6_pcie->drvdata->variant) {
+ case IMX8MQ:
+ case IMX8MQ_EP:
+ if (imx6_pcie->controller_id == 1) {
+ mask = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE;
+ val = FIELD_PREP(IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
+ mode);
+ } else {
+ mask = IMX6Q_GPR12_DEVICE_TYPE;
+ val = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE, mode);
+ }
+ break;
+ default:
mask = IMX6Q_GPR12_DEVICE_TYPE;
val = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE, mode);
+ break;
}

regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, mask, val);
@@ -315,6 +326,7 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
*/
break;
case IMX8MQ:
+ case IMX8MQ_EP:
/*
* TODO: Currently this code assumes external
* oscillator is being used
@@ -566,6 +578,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
break;
case IMX8MM:
case IMX8MQ:
+ case IMX8MQ_EP:
case IMX8MP:
ret = clk_prepare_enable(imx6_pcie->pcie_aux);
if (ret) {
@@ -611,6 +624,7 @@ static void imx6_pcie_disable_ref_clk(struct imx6_pcie *imx6_pcie)
break;
case IMX8MM:
case IMX8MQ:
+ case IMX8MQ_EP:
case IMX8MP:
clk_disable_unprepare(imx6_pcie->pcie_aux);
break;
@@ -676,6 +690,7 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
switch (imx6_pcie->drvdata->variant) {
case IMX7D:
case IMX8MQ:
+ case IMX8MQ_EP:
reset_control_assert(imx6_pcie->pciephy_reset);
fallthrough;
case IMX8MM:
@@ -717,6 +732,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)

switch (imx6_pcie->drvdata->variant) {
case IMX8MQ:
+ case IMX8MQ_EP:
reset_control_deassert(imx6_pcie->pciephy_reset);
break;
case IMX7D:
@@ -804,6 +820,7 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
break;
case IMX7D:
case IMX8MQ:
+ case IMX8MQ_EP:
case IMX8MM:
case IMX8MP:
reset_control_deassert(imx6_pcie->apps_reset);
@@ -824,6 +841,7 @@ static void imx6_pcie_ltssm_disable(struct device *dev)
break;
case IMX7D:
case IMX8MQ:
+ case IMX8MQ_EP:
case IMX8MM:
case IMX8MP:
reset_control_assert(imx6_pcie->apps_reset);
@@ -1075,6 +1093,9 @@ static int imx6_add_pcie_ep(struct imx6_pcie *imx6_pcie,
ep->ops = &pcie_ep_ops;

switch (imx6_pcie->drvdata->variant) {
+ case IMX8MQ_EP:
+ pcie_dbi2_offset = SZ_1M;
+ break;
default:
pcie_dbi2_offset = SZ_4K;
break;
@@ -1260,6 +1281,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
"pcie_inbound_axi clock missing or invalid\n");
break;
case IMX8MQ:
+ case IMX8MQ_EP:
imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
if (IS_ERR(imx6_pcie->pcie_aux))
return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
@@ -1444,6 +1466,11 @@ static const struct imx6_pcie_drvdata drvdata[] = {
.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
.gpr = "fsl,imx8mp-iomuxc-gpr",
},
+ [IMX8MQ_EP] = {
+ .variant = IMX8MQ_EP,
+ .mode = DW_PCIE_EP_TYPE,
+ .gpr = "fsl,imx8mq-iomuxc-gpr",
+ },
};

static const struct of_device_id imx6_pcie_of_match[] = {
@@ -1454,6 +1481,7 @@ static const struct of_device_id imx6_pcie_of_match[] = {
{ .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], },
{ .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], },
{ .compatible = "fsl,imx8mp-pcie", .data = &drvdata[IMX8MP], },
+ { .compatible = "fsl,imx8mq-pcie-ep", .data = &drvdata[IMX8MQ_EP], },
{},
};

--
2.25.1