From: Jim Quinlan <jquinlan@xxxxxxxxxxxx>
Broadcom Set-top (BrcmSTB) boards typically support S2, S3,
and S5 suspend and resume. This commit enables the PCIe
driver to do so.
Signed-off-by: Jim Quinlan <jquinlan@xxxxxxxxxxxx>
---
drivers/pci/controller/pcie-brcmstb.c | 49 +++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index c1cf4ea7d3d9..39993203b991 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -972,6 +972,49 @@ static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
brcm_pcie_bridge_sw_init_set(pcie, 1);
}
+static int brcm_pcie_suspend(struct device *dev)
+{
+ struct brcm_pcie *pcie = dev_get_drvdata(dev);
+ int ret = 0;
+
+ brcm_pcie_turn_off(pcie);
+ clk_disable_unprepare(pcie->clk);
+
+ return ret;
+}
+
+static int brcm_pcie_resume(struct device *dev)
+{
+ struct brcm_pcie *pcie = dev_get_drvdata(dev);
+ void __iomem *base;
+ u32 tmp;
+ int ret;
+
+ base = pcie->base;
+ clk_prepare_enable(pcie->clk);
+
+ /* Take bridge out of reset so we can access the SERDES reg */
+ brcm_pcie_bridge_sw_init_set(pcie, 0);
+
+ /* SERDES_IDDQ = 0 */
+ tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
+ u32p_replace_bits(&tmp, 0,
+ PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
+ writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
+
+ /* wait for serdes to be stable */
+ udelay(100);
+
+ ret = brcm_pcie_setup(pcie);
+ if (ret)
+ return ret;
+
+ if (pcie->msi)
+ brcm_msi_set_regs(pcie->msi);
+
+ return 0;
+}
+
static void __brcm_pcie_remove(struct brcm_pcie *pcie)
{
brcm_msi_remove(pcie);
@@ -1090,12 +1133,18 @@ static int brcm_pcie_probe(struct platform_device *pdev)
MODULE_DEVICE_TABLE(of, brcm_pcie_match);
+static const struct dev_pm_ops brcm_pcie_pm_ops = {
+ .suspend_noirq = brcm_pcie_suspend,
+ .resume_noirq = brcm_pcie_resume,
+};
+
static struct platform_driver brcm_pcie_driver = {
.probe = brcm_pcie_probe,
.remove = brcm_pcie_remove,
.driver = {
.name = "brcm-pcie",
.of_match_table = brcm_pcie_match,
+ .pm = &brcm_pcie_pm_ops,
},
};
module_platform_driver(brcm_pcie_driver);
--
2.17.1
