Hi Laurent,
On Wed, Jan 4, 2017 at 12:06 AM, Laurent Pinchart
<laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> wrote:
> Even though most of its registers are 8-bit wide, the IRDA has two
> 16-bit registers that make it a 16-bit peripheral and not a 8-bit
> peripheral with addresses shifted by one. Fix the memory resource size
> and the platform data regshift value.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> ---
> arch/sh/kernel/cpu/sh3/setup-sh770x.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/sh/kernel/cpu/sh3/setup-sh770x.c b/arch/sh/kernel/cpu/sh3/setup-sh770x.c
> index e1e54258b822..084a91e6027e 100644
> --- a/arch/sh/kernel/cpu/sh3/setup-sh770x.c
> +++ b/arch/sh/kernel/cpu/sh3/setup-sh770x.c
> @@ -157,11 +157,10 @@ static struct platform_device scif1_device = {
> static struct plat_sci_port scif2_platform_data = {
> .type = PORT_IRDA,
> .ops = &sh770x_sci_port_ops,
> - .regshift = 1,
According to my sh7707 and sh7709 datasheets. regshift = 1 is correct.
SCIx_IRDA_REGTYPE uses:
[SCSMR] = { 0x00, 8 },
[SCBRR] = { 0x01, 8 },
[SCSCR] = { 0x02, 8 },
[SCxTDR] = { 0x03, 8 },
[SCxSR] = { 0x04, 8 },
[SCxRDR] = { 0x05, 8 },
[SCFCR] = { 0x06, 8 },
[SCFDR] = { 0x07, 16 },
While the datasheet says:
SCSMR1 H'A4000140 8 bits
SCBRR1 H'A4000142 8 bits
SCSCR1 H'A4000144 8 bits
SCFTDR1 H'A4000146 8 bits
SCSSR1 H'A4000148 16 bits
SCFRDR1 H'A400014A 8 bits
SCFCR1 H'A400014C 8 bits
SCFDR1 H'A400014E 16 bits
So you do need regshift = 1 to handle the gaps.
Note that SCSSR1 is a 16-bit registers, while SCIx_IRDA_REGTYPE
declares it as 8-bit, so it may not work at all...
Ah, you're fixing all this in "[PATCH 19/19] serial: sh-sci: Compute the
regshift value for SCI ports".
I think that part should be moved to this patch, to not break bisection.
> static struct resource scif2_resources[] = {
> - DEFINE_RES_MEM(0xa4000140, 0x10),
> + DEFINE_RES_MEM(0xa4000140, 0x20),
> DEFINE_RES_IRQ(evt2irq(0x880)),
> };
According to the register list above, resource size 0x10 is correct.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
