Hi David,
I have made some small alterations as the 82077 DOR register needs to be
written to or FDC resets do not get done.
This version works better on the SS1 (80277) suggesting that I missed
somthing on my initial version.
The change to the detection system also works fine on the SS2 (82072A).
I have also added in the other 82077 registers so I can read/write to them
if needed, to deal with the spurious interrupt issue.
I do not have data sheets for the 82072A and the 82077 (pre-1991), only a
data sheet for the 82077A, so if the spurious interrupts need to be fixed,
I will have to do it by trial and error using the data sheet as a guide as
to what I should be seeing.
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.
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>
---
Tested on SS2 (82072A) and SS1 Clone (82077).
David, I made a small change to your version as the 82077 needs to write to the
82077 DOR register or FDC resets don't get done.
Also I have not tested DiskChanged. I am not sure if it uses auxio, the 82077
or both. I have found some Solaris 26 code on the web that sugests that it
depends on the version of the hardware and that my hardware uses auxio.
This new patch still gets spurious interrupts but apears to work better than
my original version.
Early 82077 FDC's like mine have bugs in them and I suspect that this is not
being catered for correctly in drivers/block/floppy.c.
--- linux-2.6/include/asm-sparc/floppy.h 2007-07-21 03:26:52.000000000 +0100
+++ linux-test/include/asm-sparc/floppy.h 2007-07-26 01:31:46.000000000 +0100
@@ -101,6 +101,29 @@ static struct sun_floppy_ops sun_fdops;
#define CROSS_64KB(a,s) (0)
/* Routines unique to each controller type on a Sun. */
+static void sun_set_dor(unsigned char value, int fdc_82077)
+{
+ if (sparc_cpu_model == sun4c) {
+ unsigned int 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));
+ }
+ if (fdc_82077) {
+ sun_fdc->dor_82077 = value;
+ }
+}
+
+static unsigned char sun_read_dir(void)
+{
+ if (sparc_cpu_model == sun4c)
+ return (get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0;
+ else
+ return sun_fdc->dir_82077;
+}
+
static unsigned char sun_82072_fd_inb(int port)
{
udelay(5);
@@ -113,7 +136,7 @@ static unsigned char sun_82072_fd_inb(in
case 5: /* FD_DATA */
return sun_fdc->data_82072;
case 7: /* FD_DIR */
- return (get_auxio() & AUXIO_FLPY_DCHG)? 0x80: 0;
+ return sun_read_dir();
};
panic("sun_82072_fd_inb: How did I get here?");
}
@@ -126,20 +149,7 @@ static void sun_82072_fd_outb(unsigned c
printk("floppy: Asked to write to unknown port %d\n", port);
panic("floppy: Port bolixed.");
case 2: /* FD_DOR */
- /* Oh geese, 82072 on the Sun has no DOR register,
- * the functionality is implemented via the AUXIO
- * I/O register. So we must emulate the behavior.
- *
- * 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_set_dor(value, 0);
break;
case 5: /* FD_DATA */
sun_fdc->data_82072 = value;
@@ -161,15 +171,22 @@ static unsigned char sun_82077_fd_inb(in
default:
printk("floppy: Asked to read unknown port %d\n", port);
panic("floppy: Port bolixed.");
+ case 0: /* FD_STATUS_0 */
+ return sun_fdc->status1_82077;
+ case 1: /* FD_STATUS_1 */
+ return sun_fdc->status2_82077;
+ case 2: /* FD_DOR */
+ return sun_fdc->dor_82077;
+ case 3: /* FD_TDR */
+ return sun_fdc->tapectl_82077;
case 4: /* FD_STATUS */
return sun_fdc->status_82077 & ~STATUS_DMA;
case 5: /* FD_DATA */
return sun_fdc->data_82077;
case 7: /* FD_DIR */
- /* XXX: Is DCL on 0x80 in sun4m? */
- return sun_fdc->dir_82077;
+ return sun_read_dir();
};
- panic("sun_82072_fd_inb: How did I get here?");
+ panic("sun_82077_fd_inb: How did I get here?");
}
static void sun_82077_fd_outb(unsigned char value, int port)
@@ -180,8 +197,7 @@ static void sun_82077_fd_outb(unsigned c
printk("floppy: Asked to write to unknown port %d\n", port);
panic("floppy: Port bolixed.");
case 2: /* FD_DOR */
- /* Happily, the 82077 has a real DOR register. */
- sun_fdc->dor_82077 = value;
+ sun_set_dor(value, 1);
break;
case 5: /* FD_DATA */
sun_fdc->data_82077 = value;
@@ -192,6 +208,9 @@ static void sun_82077_fd_outb(unsigned c
case 4: /* FD_STATUS */
sun_fdc->status_82077 = value;
break;
+ case 3: /* FD_TDR */
+ sun_fdc->tapectl_82077 = value;
+ break;
};
return;
}
@@ -332,16 +351,17 @@ static int sun_floppy_init(void)
goto no_sun_fdc;
}
- 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 */
- } else {
- sun_fdops.fd_inb = sun_82077_fd_inb;
- sun_fdops.fd_outb = sun_82077_fd_outb;
- fdc_status = &sun_fdc->status_82077;
- /* printk("DOR @0x%p\n", &sun_fdc->dor_82077); */ /* P3 */
+ sun_fdops.fd_inb = sun_82077_fd_inb;
+ sun_fdops.fd_outb = sun_82077_fd_outb;
+ fdc_status = &sun_fdc->status_82077;
+
+ if (sun_fdc->dor_82077 == 0x80) {
+ sun_fdc->dor_82077 = 0x02;
+ if (sun_fdc->dor_82077 == 0x80) {
+ sun_fdops.fd_inb = sun_82072_fd_inb;
+ sun_fdops.fd_outb = sun_82072_fd_outb;
+ fdc_status = &sun_fdc->status_82072;
+ }
}
/* Success... */
