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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