From e7cd7ef58e1fedb09b16720919869a81d7a2b867 Mon Sep 17 00:00:00 2001 From: Jaehoon Chung Date: Mon, 13 Feb 2017 17:26:13 +0900 Subject: [PATCH] PCI: exynos: Support the PHY generic framework Switch the pci-exynos driver to generic PHY framework. At the same time backward compatibility is preserved: Warning will be printed for old DTB. Refer to the binding file: - Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt Signed-off-by: Jaehoon Chung Signed-off-by: Bjorn Helgaas Reviewed-by: Pankaj Dubey Reviewed-by: Alim Akhtar Acked-by: Krzysztof Kozlowski Acked-by: Jingoo Han --- drivers/pci/host/pci-exynos.c | 54 ++++++++++++++++++++++++++++++++--- 1 file changed, 50 insertions(+), 4 deletions(-) diff --git a/drivers/pci/host/pci-exynos.c b/drivers/pci/host/pci-exynos.c index ab9e67465b9b..c86961feaa6f 100644 --- a/drivers/pci/host/pci-exynos.c +++ b/drivers/pci/host/pci-exynos.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -110,6 +111,10 @@ struct exynos_pcie { struct exynos_pcie_clk_res *clk_res; const struct exynos_pcie_ops *ops; int reset_gpio; + + /* For Generic PHY Framework */ + bool using_phy; + struct phy *phy; }; struct exynos_pcie_ops { @@ -126,6 +131,10 @@ static int exynos5440_pcie_get_mem_resources(struct platform_device *pdev, struct resource *res; struct device *dev = ep->pp.dev; + /* If using the PHY framework, doesn't need to get other resource */ + if (ep->using_phy) + return 0; + ep->mem_res = devm_kzalloc(dev, sizeof(*ep->mem_res), GFP_KERNEL); if (!ep->mem_res) return -ENOMEM; @@ -396,10 +405,28 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep) } exynos_pcie_assert_core_reset(ep); - exynos_pcie_assert_phy_reset(ep); - exynos_pcie_deassert_phy_reset(ep); - exynos_pcie_power_on_phy(ep); - exynos_pcie_init_phy(ep); + + if (ep->using_phy) { + phy_reset(ep->phy); + + exynos_pcie_writel(ep->mem_res->elbi_base, 1, + PCIE_PWR_RESET); + + phy_power_on(ep->phy); + phy_init(ep->phy); + } else { + exynos_pcie_assert_phy_reset(ep); + exynos_pcie_deassert_phy_reset(ep); + exynos_pcie_power_on_phy(ep); + exynos_pcie_init_phy(ep); + + /* pulse for common reset */ + exynos_pcie_writel(ep->mem_res->block_base, 1, + PCIE_PHY_COMMON_RESET); + udelay(500); + exynos_pcie_writel(ep->mem_res->block_base, 0, + PCIE_PHY_COMMON_RESET); + } /* pulse for common reset */ exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_COMMON_RESET); @@ -418,6 +445,11 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep) if (!dw_pcie_wait_for_link(pp)) return 0; + if (ep->using_phy) { + phy_power_off(ep->phy); + return -ETIMEDOUT; + } + while (exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_PLL_LOCKED) == 0) { val = exynos_pcie_readl(ep->mem_res->block_base, @@ -624,6 +656,17 @@ static int __init exynos_pcie_probe(struct platform_device *pdev) ep->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0); + /* Assume that controller doesn't use the PHY framework */ + ep->using_phy = false; + + ep->phy = devm_of_phy_get(dev, np, NULL); + if (IS_ERR(ep->phy)) { + if (PTR_ERR(ep->phy) == -EPROBE_DEFER) + return PTR_ERR(ep->phy); + dev_warn(dev, "Use the 'phy' property. Current DT of pci-exynos was deprecated!!\n"); + } else + ep->using_phy = true; + if (ep->ops && ep->ops->get_mem_resources) { ret = ep->ops->get_mem_resources(pdev, ep); if (ret) @@ -647,6 +690,9 @@ static int __init exynos_pcie_probe(struct platform_device *pdev) return 0; fail_probe: + if (ep->using_phy) + phy_exit(ep->phy); + if (ep->ops && ep->ops->deinit_clk_resources) ep->ops->deinit_clk_resources(ep); return ret;