Hi Finn,
On Sun, Jun 14, 2015 at 9:46 AM, Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx> wrote:
> --- linux.orig/arch/m68k/mac/misc.c 2015-06-14 17:46:02.000000000 +1000
> +++ linux/arch/m68k/mac/misc.c 2015-06-14 17:46:03.000000000 +1000
> @@ -284,11 +287,31 @@ static void via_pram_command(int command
>
> static unsigned char via_pram_read_byte(int offset)
> {
> - return 0;
> + unsigned char temp;
> + int addr = ((offset & 0xE0) << 3) | ((offset & 0x1F) << 2);
Can you please add #defines for the magic values?
> +
> + /* Use RTC command 0x38 for XPRAM access, as per MESS source code */
> + via_pram_command(addr | 0x3800 | 0x8001, &temp);
It seems 0x38 is already documented in <linux/pmu.h> (see below), or not (it's
shifted left by 8 bits?)?
> +
> + return temp;
> }
>
> static void via_pram_write_byte(unsigned char data, int offset)
> {
> + unsigned char temp;
> + int addr = ((offset & 0xE0) << 3) | ((offset & 0x1F) << 2);
> +
> + /* Clear the write protect bit */
> + temp = 0x55;
> + via_pram_command(0x34 | 0x01, &temp);
> +
> + /* Write the byte to XPRAM */
> + temp = data;
> + via_pram_command(0x3800 | 0x0001 | addr, &temp);
> +
> + /* Set the write protect bit */
> + temp = 0xD5;
> + via_pram_command(0x34 | 0x01, &temp);
More magic values...
> }
>
> /*
> Index: linux/include/uapi/linux/pmu.h
> ===================================================================
> --- linux.orig/include/uapi/linux/pmu.h 2015-06-14 17:45:34.000000000 +1000
> +++ linux/include/uapi/linux/pmu.h 2015-06-14 17:46:03.000000000 +1000
> @@ -18,7 +18,9 @@
> #define PMU_POWER_CTRL 0x11 /* control power of some devices */
> #define PMU_ADB_CMD 0x20 /* send ADB packet */
> #define PMU_ADB_POLL_OFF 0x21 /* disable ADB auto-poll */
> +#define PMU_WRITE_XPRAM 0x32 /* write eXtended Parameter RAM */
> #define PMU_WRITE_NVRAM 0x33 /* write non-volatile RAM */
> +#define PMU_READ_XPRAM 0x3a /* read eXtended Parameter RAM */
> #define PMU_READ_NVRAM 0x3b /* read non-volatile RAM */
> #define PMU_SET_RTC 0x30 /* set real-time clock */
> #define PMU_READ_RTC 0x38 /* read real-time clock */
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
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