[PATCH] arm: apple: Add initial Apple M2 Ultra support

[Mark Kettenis]

> From: Simon Glass <sjg at google.com>
> Date: Sun, 10 Sep 2023 16:36:48 -0600
> 
> Hi,
> 
> On Wed, 6 Sept 2023 at 15:50, Janne Grunau <j at jannau.net> wrote:
> >
> > Apple's M2 Ultra SoC are somewhat similar to the M1 Ultra but needs
> > a tweaked memory map as the M2 Pro/Max SoCs.  USB, NVMe, UART, WDT
> > and PCIe are working with the existing drivers.
> >
> > Signed-off-by: Janne Grunau <j at jannau.net>
> > ---
> >  arch/arm/mach-apple/board.c | 183 ++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 183 insertions(+)
> >
> > diff --git a/arch/arm/mach-apple/board.c b/arch/arm/mach-apple/board.c
> > index d50194811843..47393babbc62 100644
> > --- a/arch/arm/mach-apple/board.c
> > +++ b/arch/arm/mach-apple/board.c
> > @@ -444,6 +444,187 @@ static struct mm_region t6020_mem_map[] = {
> >         }
> >  };
> >
> > +/* Apple M2 Ultra */
> > +
> > +static struct mm_region t6022_mem_map[] = {
> > +       {
> > +               /* I/O */
> > +               .virt = 0x280000000,
> > +               .phys = 0x280000000,
> > +               .size = SZ_1G,
> > +               .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
> > +                        PTE_BLOCK_NON_SHARE |
> > +                        PTE_BLOCK_PXN | PTE_BLOCK_UXN
> > +       }, {
> 
> Is there no devicetree binding for this information?

Not directly.  The device tree does contain the addresses of the
devices of course.  But what we want here is a memory map that uses a
few big ranges that cover all the devices in the device tree rather
than lots of small ranges that cover the individual devices.

But yes, it sucks that every time Apple produces a new SoC we need to
add another memory map.