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

[Lorenzo Bianconi]

> 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)
> 

ack, I will fix them in v2

> > 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.

ack, I will fix them in v2

> 
> > +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:

ack. Anyway they are in pcie mapped regions (I have not posted the dts changes
yet):

pcie0: reg = <0x0 0x1fc00000 0x0 0x20000>;
pcie1: reg = <0x0 0x1fc20000 0x0 0x20000>;

But they are undocumented. I will try to get some info for them.

> 
>   #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.

They are undocumented in the vendor sdk, I will try some info for them (and
even for the ones below).

Regards,
Lorenzo

> 
> > +	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?
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