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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2019-01-16 18:17:00 -0800 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2019-01-18 09:43:11 +0100 |
| commit | f7e74531645d7538e6f88aa44d8a821cf9589b4a (patch) | |
| tree | bc2a9803be36a85f311c88948764553abff8f6bb /drivers/pci | |
| parent | 409a1cefecdbba0ae53a0791c28bb0a3624a6225 (diff) | |
| download | barebox-f7e74531645d7538e6f88aa44d8a821cf9589b4a.tar.gz barebox-f7e74531645d7538e6f88aa44d8a821cf9589b4a.tar.xz | |
PCI: imx6: Port imx6_pcie_ltssm_enable()
Port imx6_pcie_ltssm_enable() from Linux kernel driver.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-imx6.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/pci/pci-imx6.c b/drivers/pci/pci-imx6.c index 9aa307aabf..c1719093be 100644 --- a/drivers/pci/pci-imx6.c +++ b/drivers/pci/pci-imx6.c @@ -457,6 +457,23 @@ static int imx6_pcie_wait_for_speed_change(struct imx6_pcie *imx6_pcie) return -EINVAL; } +static void imx6_pcie_ltssm_enable(struct device_d *dev) +{ + struct imx6_pcie *imx6_pcie = dev->priv; + u32 gpr12; + + switch (imx6_pcie->variant) { + case IMX6Q: + case IMX6QP: + gpr12 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR12); + gpr12 |= IMX6Q_GPR12_PCIE_CTL_2; + writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12); + break; + case IMX7D: + reset_control_deassert(imx6_pcie->apps_reset); + break; + } +} static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie) { @@ -464,7 +481,6 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie) struct device_d *dev = pci->dev; uint32_t tmp; int ret; - u32 gpr12; /* * Force Gen1 operation when starting the link. In case the link is @@ -476,14 +492,7 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie) tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1; dw_pcie_writel_dbi(pci, PCIE_RC_LCR, tmp); - /* Start LTSSM. */ - if (imx6_pcie->variant == IMX7D) { - reset_control_deassert(imx6_pcie->apps_reset); - } else { - gpr12 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR12); - gpr12 |= IMX6Q_GPR12_PCIE_CTL_2; - writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12); - } + imx6_pcie_ltssm_enable(dev); ret = imx6_pcie_wait_for_link(imx6_pcie); if (ret) |