[SPARC]: Fix floppy on some sun4c systems.

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@mtfhpc.demon.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 50 insertions, 30 deletions

diff --git a/include/asm-sparc/floppy.h b/include/asm-sparc/floppy.h
index 9073c84218ce..28ce2b9c3da8 100644
--- a/include/asm-sparc/floppy.h
+++ b/include/asm-sparc/floppy.h
@@ -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(int port)
         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 char value, int port)
                 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(int port)
         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 char value, int port)
                 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 char value, int port)
         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... */