[TC] TURBOchannel support for the DECstation

This is the platform-specific part of TURBOchannel bus support for the
DECstation.  It implements determining whether the bus is actually there,
getting bus parameters, IRQ assignments for devices and protected accesses
to possibly unoccupied slots that may trigger bus error exceptions.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/dec/Makefile b/arch/mips/dec/Makefile
index ed181fdc3ac9f1f9214ddc2a925a965410135569..8b790c2900d5b5c84af4d30479eddfc61507bc8c 100644 (file)
--- a/arch/mips/dec/Makefile
+++ b/arch/mips/dec/Makefile
@@ -6,6 +6,7 @@ obj-y           := ecc-berr.o int-handler.o ioasic-irq.o kn01-berr.o \
                   kn02-irq.o kn02xa-berr.o reset.o setup.o time.o
 
 obj-$(CONFIG_PROM_CONSOLE)     += promcon.o
+obj-$(CONFIG_TC)               += tc.o
 obj-$(CONFIG_CPU_HAS_WB)       += wbflush.o
 
 EXTRA_AFLAGS := $(CFLAGS)

diff --git a/arch/mips/dec/prom/identify.c b/arch/mips/dec/prom/identify.c
index 81d5e878ddce8d409cfafd326454dc6eab0fcae3..c4e3c1ea0d48946f0c84b315817c43dab0f1aef6 100644 (file)
--- a/arch/mips/dec/prom/identify.c
+++ b/arch/mips/dec/prom/identify.c
@@ -88,6 +88,7 @@ static inline void prom_init_kn02(void)
 {
        dec_kn_slot_base = KN02_SLOT_BASE;
        dec_kn_slot_size = KN02_SLOT_SIZE;
+       dec_tc_bus = 1;
 
        dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + KN02_RTC);
 }
@@ -96,6 +97,7 @@ static inline void prom_init_kn02xa(void)
 {
        dec_kn_slot_base = KN02XA_SLOT_BASE;
        dec_kn_slot_size = IOASIC_SLOT_SIZE;
+       dec_tc_bus = 1;
 
        ioasic_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_IOCTL);
        dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_TOY);
@@ -105,6 +107,7 @@ static inline void prom_init_kn03(void)
 {
        dec_kn_slot_base = KN03_SLOT_BASE;
        dec_kn_slot_size = IOASIC_SLOT_SIZE;
+       dec_tc_bus = 1;
 
        ioasic_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_IOCTL);
        dec_rtc_base = (void *)CKSEG1ADDR(dec_kn_slot_base + IOASIC_TOY);

diff --git a/arch/mips/dec/setup.c b/arch/mips/dec/setup.c
index 1058e2f409bb9ec6a3fed658103affd4d5b338d1..b8a5e75ba0ab4b6bce2bc979a8c7527f050c571d 100644 (file)
--- a/arch/mips/dec/setup.c
+++ b/arch/mips/dec/setup.c
@@ -53,6 +53,8 @@ unsigned long dec_kn_slot_base, dec_kn_slot_size;
 EXPORT_SYMBOL(dec_kn_slot_base);
 EXPORT_SYMBOL(dec_kn_slot_size);
 
+int dec_tc_bus;
+
 spinlock_t ioasic_ssr_lock;
 
 volatile u32 *ioasic_base;

diff --git a/arch/mips/dec/tc.c b/arch/mips/dec/tc.c
new file mode 100644 (file)
index 0000000..732027c
--- /dev/null
+++ b/arch/mips/dec/tc.c
@@ -0,0 +1,95 @@
+/*
+ *     TURBOchannel architecture calls.
+ *
+ *     Copyright (c) Harald Koerfgen, 1998
+ *     Copyright (c) 2001, 2003, 2005, 2006  Maciej W. Rozycki
+ *     Copyright (c) 2005  James Simmons
+ *
+ *     This file is subject to the terms and conditions of the GNU
+ *     General Public License.  See the file "COPYING" in the main
+ *     directory of this archive for more details.
+ */
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/tc.h>
+#include <linux/types.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/paccess.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/prom.h>
+#include <asm/dec/system.h>
+
+/*
+ * Protected read byte from TURBOchannel slot space.
+ */
+int tc_preadb(u8 *valp, void __iomem *addr)
+{
+       return get_dbe(*valp, (u8 *)addr);
+}
+
+/*
+ * Get TURBOchannel bus information as specified by the spec, plus
+ * the slot space base address and the number of slots.
+ */
+int __init tc_bus_get_info(struct tc_bus *tbus)
+{
+       if (!dec_tc_bus)
+               return -ENXIO;
+
+       memcpy(&tbus->info, rex_gettcinfo(), sizeof(tbus->info));
+       tbus->slot_base = CPHYSADDR((long)rex_slot_address(0));
+
+       switch (mips_machtype) {
+       case MACH_DS5000_200:
+               tbus->num_tcslots = 7;
+               break;
+       case MACH_DS5000_2X0:
+       case MACH_DS5900:
+               tbus->ext_slot_base = 0x20000000;
+               tbus->ext_slot_size = 0x20000000;
+               /* fall through */
+       case MACH_DS5000_1XX:
+               tbus->num_tcslots = 3;
+               break;
+       case MACH_DS5000_XX:
+               tbus->num_tcslots = 2;
+       default:
+               break;
+       }
+       return 0;
+}
+
+/*
+ * Get the IRQ for the specified slot.
+ */
+void __init tc_device_get_irq(struct tc_dev *tdev)
+{
+       switch (tdev->slot) {
+       case 0:
+               tdev->interrupt = dec_interrupt[DEC_IRQ_TC0];
+               break;
+       case 1:
+               tdev->interrupt = dec_interrupt[DEC_IRQ_TC1];
+               break;
+       case 2:
+               tdev->interrupt = dec_interrupt[DEC_IRQ_TC2];
+               break;
+       /*
+        * Yuck! DS5000/200 onboard devices
+        */
+       case 5:
+               tdev->interrupt = dec_interrupt[DEC_IRQ_TC5];
+               break;
+       case 6:
+               tdev->interrupt = dec_interrupt[DEC_IRQ_TC6];
+               break;
+       default:
+               tdev->interrupt = -1;
+               break;
+       }
+}

diff --git a/include/asm-mips/dec/system.h b/include/asm-mips/dec/system.h
index 78af51fbc797b247b67d0a8e3c3ee5f8af009382..b2afaccd68314c650cc8edfec35f55b1f5645480 100644 (file)
--- a/include/asm-mips/dec/system.h
+++ b/include/asm-mips/dec/system.h
@@ -3,7 +3,7 @@
  *
  *     Generic DECstation/DECsystem bits.
  *
- *     Copyright (C) 2005  Maciej W. Rozycki
+ *     Copyright (C) 2005, 2006  Maciej W. Rozycki
  *
  *     This program is free software; you can redistribute it and/or
  *     modify it under the terms of the GNU General Public License
@@ -14,5 +14,6 @@
 #define __ASM_DEC_SYSTEM_H
 
 extern unsigned long dec_kn_slot_base, dec_kn_slot_size;
+extern int dec_tc_bus;
 
 #endif /* __ASM_DEC_SYSTEM_H */