Hi all,
The attached patch adds in code to support an 82077 FDC on sun4c systems.
There is a problem with spurious interrupts but it does apear to work
(very slowly).
Testing on my SS2 (82072A FDC) shows that the floppy driver is not 100% with
sun4c any way (any spurious interrupt kills it, requiring a reboot to
recover). The disk drive may have a somthing to do with the failure as it
has not been used/cleaned for some time.
My view is that floppy support on Sparc32 should be changed to be
'EXPERIMENTAL'. Maybe it works better on sun4m - anyone out there who can
check this?
The floppy driver code in drivers/block/floppy.c is not easy work with so
I do not plan to try to work out what the spurious interrupt problem
is in the near future.
Regards
Mark Fortescue.
From: Mark Fortescue <mark@xxxxxxxxxxxxxxxxxx>
Add in code to support an 82077 FDC on sun4c systems. There is a problem with
spurious interrupts but it does apear to work (very slowly).
Testing on my SS2 (82072A FDC) shows that the floppy driver is not 100% with
sun4c any way (any spurious interrupt kills it, requiring a reboot to recover).
Signed-off-by: Mark Fortescue <mark@xxxxxxxxxxxxxxxxxx>
---
diff -ruNpd -x .git -x .gitignore -x .mailmap linux-2.6/include/asm-sparc/floppy.h linux-test/include/asm-sparc/floppy.h
--- linux-2.6/include/asm-sparc/floppy.h 2007-07-21 03:26:52.000000000 +0100
+++ linux-test/include/asm-sparc/floppy.h 2007-07-25 11:05:42.000000000 +0100
@@ -154,6 +154,31 @@ static void sun_82072_fd_outb(unsigned c
return;
}
+static unsigned char sun_82077_sun4c_fd_inb(int port)
+{
+ udelay(5);
+ switch(port & 7) {
+ default:
+ printk("floppy: Asked to read unknown port %d\n", port);
+ panic("floppy: Port bolixed.");
+ case 0: /* FD_STATUS_0 (RO) */
+ return sun_fdc->status1_82077;
+ case 1: /* FD_STATUS_1 (RO) */
+ return sun_fdc->status2_82077;
+ case 2: /* FD_DOR (R/W) */
+ return sun_fdc->dor_82077;
+ case 3: /* FD_TDR (R/W) */
+ return sun_fdc->tapectl_82077;
+ case 4: /* FD_STATUS (RO) */
+ return sun_fdc->status_82077 & ~STATUS_DMA;
+ case 5: /* FD_DATA (R/W) */
+ return sun_fdc->data_82077;
+ case 7: /* FD_DIR (RO) */
+ return sun_fdc->dir_82077 | ((get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0);
+ };
+ panic("sun_82077_sun4c_fd_inb: How did I get here?");
+}
+
static unsigned char sun_82077_fd_inb(int port)
{
udelay(5);
@@ -161,15 +186,65 @@ static unsigned char sun_82077_fd_inb(in
default:
printk("floppy: Asked to read unknown port %d\n", port);
panic("floppy: Port bolixed.");
- case 4: /* FD_STATUS */
+ case 0: /* FD_STATUS_0 (RO) */
+ return sun_fdc->status1_82077;
+ case 1: /* FD_STATUS_1 (RO) */
+ return sun_fdc->status2_82077;
+ case 2: /* FD_DOR (R/W) */
+ return sun_fdc->dor_82077;
+ case 3: /* FD_TDR (R/W) */
+ return sun_fdc->tapectl_82077;
+ case 4: /* FD_STATUS (RO) */
return sun_fdc->status_82077 & ~STATUS_DMA;
- case 5: /* FD_DATA */
+ case 5: /* FD_DATA (R/W) */
return sun_fdc->data_82077;
- case 7: /* FD_DIR */
+ case 7: /* FD_DIR (RO) */
/* XXX: Is DCL on 0x80 in sun4m? */
return sun_fdc->dir_82077;
};
- panic("sun_82072_fd_inb: How did I get here?");
+ panic("sun_82077_fd_inb: How did I get here?");
+}
+
+static void sun_82077_sun4c_fd_outb(unsigned char value, int port)
+{
+ udelay(5);
+ switch(port & 7) {
+ default:
+ printk("floppy: Asked to write to unknown port %d\n", port);
+ panic("floppy: Port bolixed.");
+ case 2: /* FD_DOR (R/W) */
+ /* 82077 DOR register dose not apear to get used
+ * for drive select/eject on sun4c.
+ * The functionality is implemented via the AUXIO
+ * I/O register. So we must emulate the behavior.
+ * We set the DOR so reset gets done.
+ *
+ * ASSUMPTIONS: There will only ever be one floppy
+ * drive attached to a Sun controller
+ * and it will be at drive zero.
+ */
+ {
+ unsigned bits = 0;
+ if (value & 0x10) bits |= AUXIO_FLPY_DSEL;
+ if ((value & 0x80) == 0) bits |= AUXIO_FLPY_EJCT;
+ set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
+ }
+ sun_fdc->dor_82077 = value;
+ break;
+ case 3: /* FD_TDR (R/W) */
+ sun_fdc->tapectl_82077 = value;
+ break;
+ case 4: /* FD_DRS (WO) */
+ sun_fdc->drs_82077 = value;
+ break;
+ case 5: /* FD_DATA (R/W) */
+ sun_fdc->data_82077 = value;
+ break;
+ case 7: /* FD_DCR (WO) */
+ sun_fdc->dcr_82077 = value;
+ break;
+ };
+ return;
}
static void sun_82077_fd_outb(unsigned char value, int port)
@@ -183,15 +258,18 @@ static void sun_82077_fd_outb(unsigned c
/* Happily, the 82077 has a real DOR register. */
sun_fdc->dor_82077 = value;
break;
+ case 3: /* FD_TDR (R/W) */
+ sun_fdc->tapectl_82077 = value;
+ break;
+ case 4: /* FD_DRS (WO) */
+ sun_fdc->drs_82077 = value;
+ break;
case 5: /* FD_DATA */
sun_fdc->data_82077 = value;
break;
case 7: /* FD_DCR */
sun_fdc->dcr_82077 = value;
break;
- case 4: /* FD_STATUS */
- sun_fdc->status_82077 = value;
- break;
};
return;
}
@@ -331,12 +409,25 @@ static int sun_floppy_init(void)
sun_fdc = NULL;
goto no_sun_fdc;
}
+ if (sparc_cpu_model == sun4c) {
+ /* extern unsigned char *auxio_register; */ /* P3 */
- if(sparc_cpu_model == sun4c) {
- sun_fdops.fd_inb = sun_82072_fd_inb;
- sun_fdops.fd_outb = sun_82072_fd_outb;
- fdc_status = &sun_fdc->status_82072;
- /* printk("AUXIO @0x%lx\n", auxio_register); */ /* P3 */
+ /* Some sun4c clones have an 80277 FDC so do a simple test. */
+ if ((sun_fdc->dor_82077 == sun_fdc->status_82072) &&
+ (sun_fdc->status_82077 == sun_fdc->status_82072)) {
+ /* printk ("FDC is 82072\n"); */
+ sun_fdops.fd_inb = sun_82072_fd_inb;
+ sun_fdops.fd_outb = sun_82072_fd_outb;
+ fdc_status = &sun_fdc->status_82072;
+ /* printk("AUXIO @0x%p\n", auxio_register); */ /* P3 */
+ } else {
+ /* printk ("FDC is 82077\n"); */
+ sun_fdops.fd_inb = sun_82077_sun4c_fd_inb;
+ sun_fdops.fd_outb = sun_82077_sun4c_fd_outb;
+ fdc_status = &sun_fdc->status_82077;
+ /* printk("AUXIO @0x%p %02x\n", auxio_register, *auxio_register); */ /* P3 */
+ /* printk("DOR @0x%p %02x\n", &sun_fdc->dor_82077, sun_fdc->dor_82077); */ /* P3 */
+ }
} else {
sun_fdops.fd_inb = sun_82077_fd_inb;
sun_fdops.fd_outb = sun_82077_fd_outb;
