PCI: imx: Add PME_Turn_Off support

When the root complex suspends it must send a PME_Turn_Off TLP.
Implement this by asserting the "turnoff" reset.

On imx7d this functionality is part of the System Reset Controller (SRC)
and is exposed through the linux reset-controller subsystem.

On imx6 equivalent bits are in the IOMUXC pinmux controller General
Purpose Register (GPR) area which the imx6-pcie driver accesses
directly.

This is only for imx7d right now but it's deliberately implemented as an
optional reset, ignoring the chip variant:
* Older dtbs won't have this reset so it will be ignored.
* Future chips might also expose this as a reset controller.

For example imx8m (not yet supported) has the exact same
PCIE_CTRL_APPS_TURNOFF bit in the same location.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index d13dae50dc99..2cbef2d7c207 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -50,6 +50,7 @@ struct imx6_pcie {
         struct regmap           *iomuxc_gpr;
         struct reset_control    *pciephy_reset;
         struct reset_control    *apps_reset;
+        struct reset_control    *turnoff_reset;
         enum imx6_pcie_variants variant;
         u32                     tx_deemph_gen1;
         u32                     tx_deemph_gen2_3p5db;
@@ -770,6 +771,21 @@ static void imx6_pcie_ltssm_disable(struct device *dev)
         }
 }
 
+static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
+{
+        reset_control_assert(imx6_pcie->turnoff_reset);
+        reset_control_deassert(imx6_pcie->turnoff_reset);
+
+        /*
+         * Components with an upstream port must respond to
+         * PME_Turn_Off with PME_TO_Ack but we can't check.
+         *
+         * The standard recommends a 1-10ms timeout after which to
+         * proceed anyway as if acks were received.
+         */
+        usleep_range(1000, 10000);
+}
+
 static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
 {
         clk_disable_unprepare(imx6_pcie->pcie);
@@ -790,6 +806,7 @@ static int imx6_pcie_suspend_noirq(struct device *dev)
         if (imx6_pcie->variant != IMX7D)
                 return 0;
 
+        imx6_pcie_pm_turnoff(imx6_pcie);
         imx6_pcie_clk_disable(imx6_pcie);
         imx6_pcie_ltssm_disable(dev);
 
@@ -917,6 +934,13 @@ static int imx6_pcie_probe(struct platform_device *pdev)
                 break;
         }
 
+        /* Grab turnoff reset */
+        imx6_pcie->turnoff_reset = devm_reset_control_get_optional_exclusive(dev, "turnoff");
+        if (IS_ERR(imx6_pcie->turnoff_reset)) {
+                dev_err(dev, "Failed to get TURNOFF reset control\n");
+                return PTR_ERR(imx6_pcie->turnoff_reset);
+        }
+
         /* Grab GPR config register range */
         imx6_pcie->iomuxc_gpr =
                  syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");