Re: [PATCH 2/3] gpio: tegra186: Program interrupt route mapping

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Nov 12, 2019 at 11:11:35AM +0100, Bartosz Golaszewski wrote:
> pt., 8 lis 2019 o 16:34 Thierry Reding <thierry.reding@gmail.com> napisał(a):
> >
> > From: Thierry Reding <treding@nvidia.com>
> >
> > The controls for the GG port on Tegra194 resides in the power partition
> > of the C5 PCIe controller and its interrupt route mapping can therefore
> > not be programmed by early boot firmware along with that of the other
> > ports.
> >
> > Detect this generically by looking at which controls have already been
> > locked down using the security registers and fill in default values for
> > controls that are unlocked.
> >
> > Signed-off-by: Thierry Reding <treding@nvidia.com>
> > ---
> >  drivers/gpio/gpio-tegra186.c | 46 ++++++++++++++++++++++++++++++++++++
> >  1 file changed, 46 insertions(+)
> >
> > diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
> > index 32714cefdfde..404ebb82bfa2 100644
> > --- a/drivers/gpio/gpio-tegra186.c
> > +++ b/drivers/gpio/gpio-tegra186.c
> > @@ -15,6 +15,14 @@
> >  #include <dt-bindings/gpio/tegra186-gpio.h>
> >  #include <dt-bindings/gpio/tegra194-gpio.h>
> >
> > +/* security registers */
> > +#define TEGRA186_GPIO_CTL_SCR 0x0c
> > +#define  TEGRA186_GPIO_CTL_SCR_SEC_WEN BIT(28)
> > +#define  TEGRA186_GPIO_CTL_SCR_SEC_REN BIT(27)
> > +
> > +#define TEGRA186_GPIO_INT_ROUTE_MAPPING(p, x) (0x14 + (p) * 0x20 + (x) * 4)
> > +
> > +/* control registers */
> >  #define TEGRA186_GPIO_ENABLE_CONFIG 0x00
> >  #define  TEGRA186_GPIO_ENABLE_CONFIG_ENABLE BIT(0)
> >  #define  TEGRA186_GPIO_ENABLE_CONFIG_OUT BIT(1)
> > @@ -64,6 +72,7 @@ struct tegra_gpio {
> >
> >         const struct tegra_gpio_soc *soc;
> >
> > +       void __iomem *secure;
> >         void __iomem *base;
> >  };
> >
> > @@ -449,6 +458,37 @@ static const struct of_device_id tegra186_pmc_of_match[] = {
> >         { /* sentinel */ }
> >  };
> >
> > +static void tegra186_gpio_init_route_mapping(struct tegra_gpio *gpio)
> > +{
> > +       unsigned int i, j;
> > +       u32 value;
> > +
> > +       for (i = 0; i < gpio->soc->num_ports; i++) {
> > +               const struct tegra_gpio_port *port = &gpio->soc->ports[i];
> > +               unsigned int offset, p = port->port;
> > +               void __iomem *base;
> > +
> > +               base = gpio->secure + port->bank * 0x1000 + 0x800;
> > +
> > +               value = readl(base + TEGRA186_GPIO_CTL_SCR);
> > +
> > +               /*
> > +                * For controllers that haven't been locked down yet, make
> > +                * sure to program the default interrupt route mapping.
> > +                */
> > +               if ((value & TEGRA186_GPIO_CTL_SCR_SEC_REN) == 0 &&
> > +                   (value & TEGRA186_GPIO_CTL_SCR_SEC_WEN) == 0) {
> > +                       for (j = 0; j < 8; j++) {
> > +                               offset = TEGRA186_GPIO_INT_ROUTE_MAPPING(p, j);
> > +
> > +                               value = readl(base + offset);
> > +                               value = BIT(port->pins) - 1;
> > +                               writel(value, base + offset);
> > +                       }
> > +               }
> > +       }
> > +}
> > +
> >  static int tegra186_gpio_probe(struct platform_device *pdev)
> >  {
> >         unsigned int i, j, offset;
> > @@ -464,6 +504,10 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
> >
> >         gpio->soc = of_device_get_match_data(&pdev->dev);
> >
> > +       gpio->secure = devm_platform_ioremap_resource_byname(pdev, "security");
> > +       if (IS_ERR(gpio->secure))
> > +               return PTR_ERR(gpio->secure);
> > +
> >         gpio->base = devm_platform_ioremap_resource_byname(pdev, "gpio");
> >         if (IS_ERR(gpio->base))
> >                 return PTR_ERR(gpio->base);
> > @@ -558,6 +602,8 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
> >                         return -EPROBE_DEFER;
> >         }
> >
> > +       tegra186_gpio_init_route_mapping(gpio);
> > +
> >         irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,
> >                                 sizeof(*irq->map), GFP_KERNEL);
> >         if (!irq->map)
> > --
> > 2.23.0
> >
> 
> This doesn't apply without a patch that went through Greg's driver-core tree.
> 
> Greg: can you provide us with an immutable branch which we can merge
> into the gpio for-next tree?

A branch for/called what?

You can always pull from my driver-core-next branch, I never rebase it.

thanks,

greg k-h