[PATCH v9 16/16] PCI: imx6: Add iMX95 Endpoint (EP) support

Frank Li
2024-01-19T17:13:06Z

Add iMX95 EP support and add 64bit address support. Internal bus bridge for
PCI support 64bit dma address in iMX95. Hence, call
dma_set_mask_and_coherent() to set 64 bit DMA mask.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
Change from v8 to v9
- update fixme comments
- update BAR1 comments
- Add mani's review tag
Change from v7 to v8
- Update commit message
- Using Fixme
- Update clks_cnts by ARRAY_SIZE

Change from v4 to v7
- none
Change from v3 to v4
- change align to 4k for imx95
Change from v1 to v3
- new patches at v3

drivers/pci/controller/dwc/pci-imx6.c | 47 +++++++++++++++++++++++++++
1 file changed, 47 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index bbaa45c08323b..7889318f6555a 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -75,6 +75,7 @@ enum imx6_pcie_variants {
IMX8MQ_EP,
IMX8MM_EP,
IMX8MP_EP,
+ IMX95_EP,
};

#define IMX6_PCIE_FLAG_IMX6_PHY BIT(0)
@@ -84,6 +85,7 @@ enum imx6_pcie_variants {
#define IMX6_PCIE_FLAG_HAS_APP_RESET BIT(4)
#define IMX6_PCIE_FLAG_HAS_PHY_RESET BIT(5)
#define IMX6_PCIE_FLAG_HAS_SERDES BIT(6)
+#define IMX6_PCIE_FLAG_SUPPORT_64BIT BIT(7)

#define imx6_check_flag(pci, val) (pci->drvdata->flags & val)

@@ -616,6 +618,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
break;
case IMX7D:
case IMX95:
+ case IMX95_EP:
break;
case IMX8MM:
case IMX8MM_EP:
@@ -1050,6 +1053,23 @@ static const struct pci_epc_features imx8m_pcie_epc_features = {
.align = SZ_64K,
};

+/*
+ * BAR# | Default BAR enable | Default BAR Type | Default BAR Size | BAR Sizing Scheme
+ * ================================================================================================
+ * BAR0 | Enable | 64-bit | 1 MB | Programmable Size
+ * BAR1 | Disable | 32-bit | 64 KB | Fixed Size
+ * BAR1 should be disabled if BAR0 is 64bit.
+ * BAR2 | Enable | 32-bit | 1 MB | Programmable Size
+ * BAR3 | Enable | 32-bit | 64 KB | Programmable Size
+ * BAR4 | Enable | 32-bit | 1M | Programmable Size
+ * BAR5 | Enable | 32-bit | 64 KB | Programmable Size
+ */
+static const struct pci_epc_features imx95_pcie_epc_features = {
+ .msi_capable = true,
+ .bar_fixed_size[1] = SZ_64K,
+ .align = SZ_4K,
+};
+
static const struct pci_epc_features*
imx6_pcie_ep_get_features(struct dw_pcie_ep *ep)
{
@@ -1092,6 +1112,15 @@ static int imx6_add_pcie_ep(struct imx6_pcie *imx6_pcie,

pci->dbi_base2 = pci->dbi_base + pcie_dbi2_offset;

+ /*
+ * FIXME: Ideally, dbi2 base address should come from DT. But since only IMX95 is defining
+ * "dbi2" in DT, "dbi_base2" is set to NULL here for that platform alone so that the DWC
+ * core code can fetch that from DT. But once all platform DTs were fixed, this and the
+ * above "dbi_base2" setting should be removed.
+ */
+ if (imx6_pcie->drvdata->variant == IMX95_EP)
+ pci->dbi_base2 = NULL;
+
ret = dw_pcie_ep_init(ep);
if (ret) {
dev_err(dev, "failed to initialize endpoint\n");
@@ -1345,6 +1374,9 @@ static int imx6_pcie_probe(struct platform_device *pdev)
"unable to find iomuxc registers\n");
}

+ if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_SUPPORT_64BIT))
+ dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
+
/* Grab PCIe PHY Tx Settings */
if (of_property_read_u32(node, "fsl,tx-deemph-gen1",
&imx6_pcie->tx_deemph_gen1))
@@ -1563,6 +1595,20 @@ static const struct imx6_pcie_drvdata drvdata[] = {
.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
.epc_features = &imx8m_pcie_epc_features,
},
+ [IMX95_EP] = {
+ .variant = IMX95_EP,
+ .flags = IMX6_PCIE_FLAG_HAS_SERDES |
+ IMX6_PCIE_FLAG_SUPPORT_64BIT,
+ .clk_names = imx8mq_clks,
+ .clks_cnt = ARRAY_SIZE(imx8mq_clks),
+ .ltssm_off = IMX95_PE0_GEN_CTRL_3,
+ .ltssm_mask = IMX95_PCIE_LTSSM_EN,
+ .mode_off[0] = IMX95_PE0_GEN_CTRL_1,
+ .mode_mask[0] = IMX95_PCIE_DEVICE_TYPE,
+ .init_phy = imx95_pcie_init_phy,
+ .epc_features = &imx95_pcie_epc_features,
+ .mode = DW_PCIE_EP_TYPE,
+ },
};

static const struct of_device_id imx6_pcie_of_match[] = {
@@ -1577,6 +1623,7 @@ static const struct of_device_id imx6_pcie_of_match[] = {
{ .compatible = "fsl,imx8mq-pcie-ep", .data = &drvdata[IMX8MQ_EP], },
{ .compatible = "fsl,imx8mm-pcie-ep", .data = &drvdata[IMX8MM_EP], },
{ .compatible = "fsl,imx8mp-pcie-ep", .data = &drvdata[IMX8MP_EP], },
+ { .compatible = "fsl,imx95-pcie-ep", .data = &drvdata[IMX95_EP], },
{},
};

--
2.34.1