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PCI: exynos: Support the PHY generic framework

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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 <jh80.chung@samsung.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
This commit is contained in:
Jaehoon Chung 2017-02-13 17:26:13 +09:00 committed by Bjorn Helgaas
parent 34f80c7ddf
commit e7cd7ef58e
1 changed files with 50 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/pci/host/pci-exynos.c
View File

@ -21,6 +21,7 @@
#include <linux/of_gpio.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/resource.h>
#include <linux/signal.h>
#include <linux/types.h>
@ -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;