Add wakeup host op to dw_pcie_ep_ops to wake up host.
If the EPF asks to send PME trigger the inband PME by writing
into the parf registers otherwise toggle wake signal.
Signed-off-by: Krishna chaitanya chundru <quic_krichai@xxxxxxxxxxx>
---
drivers/pci/controller/dwc/pcie-qcom-ep.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index e75aec4..e382b4b 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -89,6 +89,7 @@
/* PARF_PM_CTRL register fields */
#define PARF_PM_CTRL_REQ_EXIT_L1 BIT(1)
#define PARF_PM_CTRL_READY_ENTR_L23 BIT(2)
+#define PARF_PM_CTRL_XMT_PME BIT(4)
#define PARF_PM_CTRL_REQ_NOT_ENTR_L1 BIT(5)
/* PARF_MHI_CLOCK_RESET_CTRL fields */
@@ -729,10 +730,40 @@ static void qcom_pcie_ep_init(struct dw_pcie_ep *ep)
dw_pcie_ep_reset_bar(pci, bar);
}
+static int qcom_pcie_ep_wakeup_host(struct dw_pcie_ep *ep, u8 func_no,
+ enum pci_epc_wakeup_host_type type)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+ struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
+ struct device *dev = pci->dev;
+ u32 val;
+
+ if (type == PCI_WAKEUP_TOGGLE_WAKE) {
+ dev_dbg(dev, "Waking up the host by toggling WAKE#\n");
+ gpiod_set_value_cansleep(pcie_ep->wake, 1);
+ usleep_range(WAKE_DELAY_US, WAKE_DELAY_US + 500);
+ gpiod_set_value_cansleep(pcie_ep->wake, 0);
+ return 0;
+
+ } else if (type == PCI_WAKEUP_SEND_PME) {
+ dev_dbg(dev, "Waking up the host using PME\n");
+ val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
+ val |= PARF_PM_CTRL_XMT_PME;
+ writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL);
+
+ } else {
+ dev_err(dev, "Device is not in D3 state wakeup is not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
static const struct dw_pcie_ep_ops pci_ep_ops = {
.ep_init = qcom_pcie_ep_init,
.raise_irq = qcom_pcie_ep_raise_irq,
.get_features = qcom_pcie_epc_get_features,
+ .wakeup_host = qcom_pcie_ep_wakeup_host,
};
static int qcom_pcie_ep_probe(struct platform_device *pdev)
--
2.7.4
