[U-Boot] [PATCH 6/9] ARM: sunxi: Add support for R_PIO gpio banks

[Ian Campbell <ijc@hellion.org.uk>]

On Sun, 2014-10-12 at 16:23 +0800, Chen-Yu Tsai wrote:
> On Sun, Oct 12, 2014 at 12:05 AM, Ian Campbell <ijc@hellion.org.uk> wrote:
> > On Tue, 2014-10-07 at 15:11 +0800, Chen-Yu Tsai wrote:
> >> From: Hans de Goede <hdegoede@redhat.com>
> >>
> >> The A31, A23 and later SoCs have an extra pin controller, called CPUs_PIO
> >> or R_PIO, which handles pin banks L and beyond.
> >
> > Does it also have enough space for 9 banks? Since you overlay a struct
> > sunxi_gpio_reg on it which has a gpio_bank[SUNXI_GPIO_BANKS] over it.
> 
> Yes it does, as seen in the latest A31 manuals released by Allwinner.
> 
> > SUNXI_GPIO_BANKS is now also confusingly named since it is really
> > "number of banks on the first/original GPIO controller". Eventually
> > someone will use it as the actual total and be very sad.
> >
> > I think it might be best if we retcon some distinct name onto the
> > original GPIO controller so we can have SUNXIO_GPIO_BLA_BANKS and
> > SUNXI_GPIO_R_BANKS (or even just call them controller 0 and 1 and have
> > SUNXI_GPIO0_BANKS and SUNXI_GPIO1_BANKS, if that's not too confusing)
> 
> The latest manuals have "CPUx-PORT" and "CPUs-PORT" for the respective
> chapters. I'm guessing "x" is for 0~3 cores, and s is for standby or
> something.
> 
> Of course it's also confusing that Allwinner's sources use the "R_"
> prefix for all hardware in that address range, while the datasheet
> lists the GPIO function names as "s_something".
> 
> We might want to make sure the naming is consistent with the kernel
> as well. (+CC Maxime)

Good idea, last thing we want to do is introduce yet another
"standard" ;-)

> 
> ChenYu
> 
> > If we still need SUNXI_GPIO_BANKS after that then it would be the sum of
> > those two.
> >
> >> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> >> [wens at csie.org: expanded commit message]
> >> [wens at csie.org: add pin bank M and expand comments]
> >> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
> >> ---
> >>  arch/arm/include/asm/arch-sunxi/gpio.h | 25 +++++++++++++++++++++++--
> >>  1 file changed, 23 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h
> >> index b94ec4d..bbe815a 100644
> >> --- a/arch/arm/include/asm/arch-sunxi/gpio.h
> >> +++ b/arch/arm/include/asm/arch-sunxi/gpio.h
> >> @@ -10,6 +10,7 @@
> >>  #define _SUNXI_GPIO_H
> >>
> >>  #include <linux/types.h>
> >> +#include <asm/arch/cpu.h>
> >>
> >>  /*
> >>   * sunxi has 9 banks of gpio, they are:
> >> @@ -29,6 +30,19 @@
> >>  #define SUNXI_GPIO_I 8
> >>  #define SUNXI_GPIO_BANKS 9
> >>
> >> +/*
> >> + * sun6i/sun8i and later SoCs have an additional GPIO controller (R_PIO)
> >> + * at a different register offset.
> >> + *
> >> + * sun6i has 2 banks:
> >> + * PL0 - PL8  | PM0 - PM7
> >> + *
> >> + * sun8i has 1 bank:
> >> + * PL0 - PL11
> >> + */
> >> +#define SUNXI_GPIO_L 9
> >> +#define SUNXI_GPIO_M 10
> >> +
> >>  struct sunxi_gpio {
> >>       u32 cfg[4];
> >>       u32 dat;
> >> @@ -50,8 +64,9 @@ struct sunxi_gpio_reg {
> >>       struct sunxi_gpio_int gpio_int;
> >>  };
> >>
> >> -#define BANK_TO_GPIO(bank) \
> >> -     &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[bank]
> >> +#define BANK_TO_GPIO(bank)   (((bank) < SUNXI_GPIO_BANKS) ? \
> >> +     &((struct sunxi_gpio_reg *)SUNXI_PIO_BASE)->gpio_bank[bank] : \
> >> +     &((struct sunxi_gpio_reg *)SUNXI_R_PIO_BASE)->gpio_bank[(bank) - SUNXI_GPIO_BANKS])
> >>
> >>  #define GPIO_BANK(pin)               ((pin) >> 5)
> >>  #define GPIO_NUM(pin)                ((pin) & 0x1f)
> >> @@ -75,6 +90,8 @@ struct sunxi_gpio_reg {
> >>  #define SUNXI_GPIO_G_NR              32
> >>  #define SUNXI_GPIO_H_NR              32
> >>  #define SUNXI_GPIO_I_NR              32
> >> +#define SUNXI_GPIO_L_NR              32
> >> +#define SUNXI_GPIO_M_NR              32
> >>
> >>  #define SUNXI_GPIO_NEXT(__gpio) \
> >>       ((__gpio##_START) + (__gpio##_NR) + 0)
> >> @@ -89,6 +106,8 @@ enum sunxi_gpio_number {
> >>       SUNXI_GPIO_G_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_F),
> >>       SUNXI_GPIO_H_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_G),
> >>       SUNXI_GPIO_I_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_H),
> >> +     SUNXI_GPIO_L_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_I),
> >> +     SUNXI_GPIO_M_START = SUNXI_GPIO_NEXT(SUNXI_GPIO_L),
> >>  };
> >>
> >>  /* SUNXI GPIO number definitions */
> >> @@ -101,6 +120,8 @@ enum sunxi_gpio_number {
> >>  #define SUNXI_GPG(_nr)       (SUNXI_GPIO_G_START + (_nr))
> >>  #define SUNXI_GPH(_nr)       (SUNXI_GPIO_H_START + (_nr))
> >>  #define SUNXI_GPI(_nr)       (SUNXI_GPIO_I_START + (_nr))
> >> +#define SUNXI_GPL(_nr)       (SUNXI_GPIO_L_START + (_nr))
> >> +#define SUNXI_GPM(_nr)       (SUNXI_GPIO_M_START + (_nr))
> >>
> >>  /* GPIO pin function config */
> >>  #define SUNXI_GPIO_INPUT     0
> >
> >
>