[PATCH 4/4] PCI: mediatek-gen3: Add Airoha EN7581 support

[Bjorn Helgaas]

On Fri, Jun 21, 2024 at 04:48:50PM +0200, Lorenzo Bianconi wrote:
> Introduce support for Airoha EN7581 pcie controller to mediatek-gen3
> pcie controller driver.

s/pcie/PCIe/ (twice)

> Tested-by: Zhengping Zhang <zhengping.zhang at airoha.com>
> Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
> ---
>  drivers/pci/controller/Kconfig              |  2 +-
>  drivers/pci/controller/pcie-mediatek-gen3.c | 84 ++++++++++++++++++++-
>  2 files changed, 84 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
> index e534c02ee34f..3bd6c9430010 100644
> --- a/drivers/pci/controller/Kconfig
> +++ b/drivers/pci/controller/Kconfig
> @@ -196,7 +196,7 @@ config PCIE_MEDIATEK
>  
>  config PCIE_MEDIATEK_GEN3
>  	tristate "MediaTek Gen3 PCIe controller"
> -	depends on ARCH_MEDIATEK || COMPILE_TEST
> +	depends on ARCH_AIROHA || ARCH_MEDIATEK || COMPILE_TEST
>  	depends on PCI_MSI
>  	help
>  	  Adds support for PCIe Gen3 MAC controller for MediaTek SoCs.
> diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
> index 9842617795a9..2dacfed665c6 100644
> --- a/drivers/pci/controller/pcie-mediatek-gen3.c
> +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
> @@ -7,6 +7,7 @@
>   */
>  
>  #include <linux/clk.h>
> +#include <linux/clk-provider.h>
>  #include <linux/delay.h>
>  #include <linux/iopoll.h>
>  #include <linux/irq.h>
> @@ -21,6 +22,8 @@
>  #include <linux/pm_domain.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/reset.h>
> +#include <linux/of_pci.h>
> +#include <linux/of_device.h>

Existing list of includes is sorted.  Preserve that sorted order.

> +static int mtk_pcie_en7581_power_up(struct mtk_gen3_pcie *pcie)
> +{
> +	struct device *dev = pcie->dev;
> +	int err;
> +
> +	writel_relaxed(0x23020133, pcie->base + 0x10044);
> +	writel_relaxed(0x50500032, pcie->base + 0x15030);
> +	writel_relaxed(0x50500032, pcie->base + 0x15130);

Magic.  Needs #defines at least for the registers.  These offsets are
HUGE, far bigger than the existing offsets:

  #define PCIE_CFGNUM_REG                 0x140
  #define PCIE_CFG_OFFSET_ADDR            0x1000
  #define PCIE_TRANS_TABLE_BASE_REG       0x800
  #define PCIE_MSI_SET_BASE_REG           0xc00
  #define PCIE_MSI_SET_ADDR_HI_BASE       0xc80
  #define PCIE_MSI_SET_ENABLE_REG         0x190
  #define PCIE_INT_ENABLE_REG             0x180
  #define PCIE_SETTING_REG                0x80
  #define PCIE_PCI_IDS_1                  0x9c
  #define PCIE_MISC_CTRL_REG              0x348
  #define PCIE_RST_CTRL_REG               0x148
  #define PCIE_LINK_STATUS_REG            0x154
  #define PCIE_LTSSM_STATUS_REG           0x150
  #define PCIE_INT_STATUS_REG             0x184

> +	err = phy_init(pcie->phy);
> +	if (err) {
> +		dev_err(dev, "failed to initialize PHY\n");
> +		return err;
> +	}
> +	mdelay(30);

Source?  Cite the spec that requires this delay and add a #define if
possible.

> +	err = phy_power_on(pcie->phy);
> +	if (err) {
> +		dev_err(dev, "failed to power on PHY\n");
> +		goto err_phy_on;
> +	}
> +
> +	err = reset_control_bulk_deassert(pcie->soc->phy_resets.num_rsts,
> +					  pcie->phy_resets);
> +	if (err) {
> +		dev_err(dev, "failed to deassert PHYs\n");
> +		goto err_phy_deassert;
> +	}
> +	usleep_range(5000, 10000);

Source?

> +	pm_runtime_enable(dev);
> +	pm_runtime_get_sync(dev);
> +
> +	err = clk_bulk_prepare(pcie->num_clks, pcie->clks);
> +	if (err) {
> +		dev_err(dev, "failed to prepare clock\n");
> +		goto err_clk_prepare;
> +	}
> +
> +	writel_relaxed(0x41474147, pcie->base + PCIE_EQ_PRESET_01_REF);
> +	writel_relaxed(0x1018020f, pcie->base + PCIE_PIPE4_PIE8_REG);
> +	mdelay(10);

Source?