The PCIe controller in rk3568 and rk3588 can operate in endpoint mode.
This endpoint mode support heavily leverages the existing code in
pcie-designware-ep.c.
Add support for endpoint mode to the existing pcie-dw-rockchip glue
driver.
Signed-off-by: Niklas Cassel <cassel@xxxxxxxxxx>
---
drivers/pci/controller/dwc/Kconfig | 17 ++-
drivers/pci/controller/dwc/pcie-dw-rockchip.c | 177 ++++++++++++++++++++++++++
2 files changed, 191 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index 8afacc90c63b..9fae0d977271 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -311,16 +311,27 @@ config PCIE_RCAR_GEN4_EP
SoCs. To compile this driver as a module, choose M here: the module
will be called pcie-rcar-gen4.ko. This uses the DesignWare core.
+config PCIE_ROCKCHIP_DW
+ bool
+
config PCIE_ROCKCHIP_DW_HOST
- bool "Rockchip DesignWare PCIe controller"
- select PCIE_DW
+ bool "Rockchip DesignWare PCIe controller (host mode)"
select PCIE_DW_HOST
depends on PCI_MSI
depends on ARCH_ROCKCHIP || COMPILE_TEST
depends on OF
help
Enables support for the DesignWare PCIe controller in the
- Rockchip SoC except RK3399.
+ Rockchip SoC (except RK3399) to work in host mode.
+
+config PCIE_ROCKCHIP_DW_EP
+ bool "Rockchip DesignWare PCIe controller (endpoint mode)"
+ select PCIE_DW_EP
+ depends on ARCH_ROCKCHIP || COMPILE_TEST
+ depends on OF
+ help
+ Enables support for the DesignWare PCIe controller in the
+ Rockchip SoC (except RK3399) to work in endpoint mode.
config PCI_EXYNOS
tristate "Samsung Exynos PCIe controller"
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
index f38d267e4e64..7614c20c7112 100644
--- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
+++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
@@ -34,10 +34,16 @@
#define to_rockchip_pcie(x) dev_get_drvdata((x)->dev)
#define PCIE_CLIENT_RC_MODE HIWORD_UPDATE_BIT(0x40)
+#define PCIE_CLIENT_EP_MODE HIWORD_UPDATE(0xf0, 0x0)
#define PCIE_CLIENT_ENABLE_LTSSM HIWORD_UPDATE_BIT(0xc)
+#define PCIE_CLIENT_DISABLE_LTSSM HIWORD_UPDATE(0x0c, 0x8)
+#define PCIE_CLIENT_INTR_STATUS_MISC 0x10
+#define PCIE_CLIENT_INTR_MASK_MISC 0x24
#define PCIE_SMLH_LINKUP BIT(16)
#define PCIE_RDLH_LINKUP BIT(17)
#define PCIE_LINKUP (PCIE_SMLH_LINKUP | PCIE_RDLH_LINKUP)
+#define PCIE_RDLH_LINK_UP_CHGED BIT(1)
+#define PCIE_LINK_REQ_RST_NOT_INT BIT(2)
#define PCIE_L0S_ENTRY 0x11
#define PCIE_CLIENT_GENERAL_CONTROL 0x0
#define PCIE_CLIENT_INTR_STATUS_LEGACY 0x8
@@ -159,6 +165,12 @@ static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip)
PCIE_CLIENT_GENERAL_CONTROL);
}
+static void rockchip_pcie_disable_ltssm(struct rockchip_pcie *rockchip)
+{
+ rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_DISABLE_LTSSM,
+ PCIE_CLIENT_GENERAL_CONTROL);
+}
+
static int rockchip_pcie_link_up(struct dw_pcie *pci)
{
struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
@@ -195,6 +207,13 @@ static int rockchip_pcie_start_link(struct dw_pcie *pci)
return 0;
}
+static void rockchip_pcie_stop_link(struct dw_pcie *pci)
+{
+ struct rockchip_pcie *rockchip = to_rockchip_pcie(pci);
+
+ rockchip_pcie_disable_ltssm(rockchip);
+}
+
static int rockchip_pcie_host_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -220,6 +239,59 @@ static const struct dw_pcie_host_ops rockchip_pcie_host_ops = {
.init = rockchip_pcie_host_init,
};
+static void rockchip_pcie_ep_init(struct dw_pcie_ep *ep)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+ enum pci_barno bar;
+
+ for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
+ dw_pcie_ep_reset_bar(pci, bar);
+};
+
+static int rockchip_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
+ unsigned int type, u16 interrupt_num)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+
+ switch (type) {
+ case PCI_IRQ_INTX:
+ return dw_pcie_ep_raise_intx_irq(ep, func_no);
+ case PCI_IRQ_MSI:
+ return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
+ case PCI_IRQ_MSIX:
+ return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
+ default:
+ dev_err(pci->dev, "UNKNOWN IRQ type\n");
+ }
+
+ return 0;
+}
+
+static const struct pci_epc_features rockchip_pcie_epc_features = {
+ .linkup_notifier = true,
+ .msi_capable = true,
+ .msix_capable = true,
+ .align = SZ_64K,
+ .bar[BAR_0] = { .type = BAR_FIXED, .fixed_size = SZ_1M, },
+ .bar[BAR_1] = { .type = BAR_FIXED, .fixed_size = SZ_1M, },
+ .bar[BAR_2] = { .type = BAR_FIXED, .fixed_size = SZ_1M, },
+ .bar[BAR_3] = { .type = BAR_FIXED, .fixed_size = SZ_1M, },
+ .bar[BAR_4] = { .type = BAR_RESERVED, },
+ .bar[BAR_5] = { .type = BAR_FIXED, .fixed_size = SZ_1M, },
+};
+
+static const struct pci_epc_features *
+rockchip_pcie_get_features(struct dw_pcie_ep *ep)
+{
+ return &rockchip_pcie_epc_features;
+}
+
+static const struct dw_pcie_ep_ops rockchip_pcie_ep_ops = {
+ .init = rockchip_pcie_ep_init,
+ .raise_irq = rockchip_pcie_raise_irq,
+ .get_features = rockchip_pcie_get_features,
+};
+
static int rockchip_pcie_clk_init(struct rockchip_pcie *rockchip)
{
struct device *dev = rockchip->pci.dev;
@@ -284,8 +356,39 @@ static void rockchip_pcie_phy_deinit(struct rockchip_pcie *rockchip)
static const struct dw_pcie_ops dw_pcie_ops = {
.link_up = rockchip_pcie_link_up,
.start_link = rockchip_pcie_start_link,
+ .stop_link = rockchip_pcie_stop_link,
};
+static irqreturn_t rockchip_pcie_ep_sys_irq_thread(int irq, void *arg)
+{
+ struct rockchip_pcie *rockchip = arg;
+ struct dw_pcie *pci = &rockchip->pci;
+ struct device *dev = pci->dev;
+ u32 reg, val;
+
+ reg = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_INTR_STATUS_MISC);
+
+ dev_dbg(dev, "PCIE_CLIENT_INTR_STATUS_MISC: %#x\n", reg);
+ dev_dbg(dev, "LTSSM_STATUS: %#x\n", rockchip_pcie_ltssm(rockchip));
+
+ if (reg & PCIE_LINK_REQ_RST_NOT_INT) {
+ dev_dbg(dev, "hot reset or link-down reset\n");
+ dw_pcie_ep_linkdown(&pci->ep);
+ }
+
+ if (reg & PCIE_RDLH_LINK_UP_CHGED) {
+ val = rockchip_pcie_ltssm(rockchip);
+ if ((val & PCIE_LINKUP) == PCIE_LINKUP) {
+ dev_dbg(dev, "link up\n");
+ dw_pcie_ep_linkup(&pci->ep);
+ }
+ }
+
+ rockchip_pcie_writel_apb(rockchip, reg, PCIE_CLIENT_INTR_STATUS_MISC);
+
+ return IRQ_HANDLED;
+}
+
static int rockchip_pcie_configure_rc(struct rockchip_pcie *rockchip)
{
struct dw_pcie_rp *pp;
@@ -307,6 +410,63 @@ static int rockchip_pcie_configure_rc(struct rockchip_pcie *rockchip)
return dw_pcie_host_init(pp);
}
+static int rockchip_pcie_configure_ep(struct platform_device *pdev,
+ struct rockchip_pcie *rockchip)
+{
+ struct device *dev = &pdev->dev;
+ int irq, ret;
+ u32 val;
+
+ if (!IS_ENABLED(CONFIG_PCIE_ROCKCHIP_DW_EP))
+ return -ENODEV;
+
+ irq = platform_get_irq_byname(pdev, "sys");
+ if (irq < 0) {
+ dev_err(dev, "missing sys IRQ resource\n");
+ return irq;
+ }
+
+ ret = devm_request_threaded_irq(dev, irq, NULL,
+ rockchip_pcie_ep_sys_irq_thread,
+ IRQF_ONESHOT, "pcie-sys", rockchip);
+ if (ret) {
+ dev_err(dev, "failed to request PCIe sys IRQ\n");
+ return ret;
+ }
+
+ /* LTSSM enable control mode */
+ val = HIWORD_UPDATE_BIT(PCIE_LTSSM_ENABLE_ENHANCE);
+ rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);
+
+ rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_EP_MODE,
+ PCIE_CLIENT_GENERAL_CONTROL);
+
+ rockchip->pci.ep.ops = &rockchip_pcie_ep_ops;
+ rockchip->pci.ep.page_size = SZ_64K;
+
+ dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
+
+ ret = dw_pcie_ep_init(&rockchip->pci.ep);
+ if (ret) {
+ dev_err(dev, "failed to initialize endpoint\n");
+ return ret;
+ }
+
+ ret = dw_pcie_ep_init_registers(&rockchip->pci.ep);
+ if (ret) {
+ dev_err(dev, "failed to initialize DWC endpoint registers\n");
+ dw_pcie_ep_deinit(&rockchip->pci.ep);
+ return ret;
+ }
+
+ dw_pcie_ep_init_notify(&rockchip->pci.ep);
+
+ /* unmask DLL up/down indicator and hot reset/link-down reset */
+ rockchip_pcie_writel_apb(rockchip, 0x60000, PCIE_CLIENT_INTR_MASK_MISC);
+
+ return ret;
+}
+
static int rockchip_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -372,6 +532,11 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
if (ret)
goto deinit_clk;
break;
+ case DW_PCIE_EP_TYPE:
+ ret = rockchip_pcie_configure_ep(pdev, rockchip);
+ if (ret)
+ goto deinit_clk;
+ break;
default:
dev_err(dev, "INVALID device type %d\n", rockchip->mode);
ret = -EINVAL;
@@ -395,15 +560,27 @@ static const struct rockchip_pcie_of_data rockchip_pcie_rc_of_data = {
.mode = DW_PCIE_RC_TYPE,
};
+static const struct rockchip_pcie_of_data rockchip_pcie_ep_of_data = {
+ .mode = DW_PCIE_EP_TYPE,
+};
+
static const struct of_device_id rockchip_pcie_of_match[] = {
{
.compatible = "rockchip,rk3568-pcie",
.data = &rockchip_pcie_rc_of_data,
},
+ {
+ .compatible = "rockchip,rk3568-pcie-ep",
+ .data = &rockchip_pcie_ep_of_data,
+ },
{
.compatible = "rockchip,rk3588-pcie",
.data = &rockchip_pcie_rc_of_data,
},
+ {
+ .compatible = "rockchip,rk3588-pcie-ep",
+ .data = &rockchip_pcie_ep_of_data,
+ },
{},
};
--
2.44.0
