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authorMaciej W. Rozycki <macro@linux-mips.org>2007-02-06 03:28:26 +0300
committerRalf Baechle <ralf@linux-mips.org>2007-02-09 19:23:16 +0300
commit33cf45b90eb73e1f3b784b50691d74f7ea381b21 (patch)
treef1be17835dd70d565dae098f3664c96c19658143 /arch/mips
parent56a47da1b940b6d3812de67fd94af9bfda6ee93a (diff)
downloadlinux-33cf45b90eb73e1f3b784b50691d74f7ea381b21.tar.xz
[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>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/dec/Makefile1
-rw-r--r--arch/mips/dec/prom/identify.c3
-rw-r--r--arch/mips/dec/setup.c2
-rw-r--r--arch/mips/dec/tc.c95
4 files changed, 101 insertions, 0 deletions
diff --git a/arch/mips/dec/Makefile b/arch/mips/dec/Makefile
index ed181fdc3ac9..8b790c2900d5 100644
--- 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 81d5e878ddce..c4e3c1ea0d48 100644
--- 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 1058e2f409bb..b8a5e75ba0ab 100644
--- 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
index 000000000000..732027c79834
--- /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;
+ }
+}