1 files changed, 260 insertions, 0 deletions

diff --git a/drivers/tc/tc.c b/drivers/tc/tc.c
new file mode 100644
index 000000000000..a89ef4df80c3
--- /dev/null
+++ b/drivers/tc/tc.c
@@ -0,0 +1,260 @@
+/*
+ * tc-init: We assume the TURBOchannel to be up and running so
+ * just probe for Modules and fill in the global data structure
+ * tc_bus.
+ *
+ * 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.
+ *
+ * Copyright (c) Harald Koerfgen, 1998
+ * Copyright (c) 2001, 2003  Maciej W. Rozycki
+ */
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <asm/addrspace.h>
+#include <asm/errno.h>
+#include <asm/dec/machtype.h>
+#include <asm/dec/prom.h>
+#include <asm/dec/tcinfo.h>
+#include <asm/dec/tcmodule.h>
+#include <asm/dec/interrupts.h>
+#include <asm/paccess.h>
+#include <asm/ptrace.h>
+
+#define TC_DEBUG
+
+MODULE_LICENSE("GPL");
+slot_info tc_bus[MAX_SLOT];
+static int num_tcslots;
+static tcinfo *info;
+
+unsigned long system_base;
+
+/*
+ * Interface to the world. Read comment in include/asm-mips/tc.h.
+ */
+
+int search_tc_card(const char *name)
+{
+        int slot;
+        slot_info *sip;
+
+        for (slot = 0; slot < num_tcslots; slot++) {
+                sip = &tc_bus[slot];
+                if ((sip->flags & FREE) &&
+                    (strncmp(sip->name, name, strlen(name)) == 0)) {
+                        return slot;
+                }
+        }
+
+        return -ENODEV;
+}
+
+void claim_tc_card(int slot)
+{
+        if (tc_bus[slot].flags & IN_USE) {
+                printk("claim_tc_card: attempting to claim a card already in use\n");
+                return;
+        }
+        tc_bus[slot].flags &= ~FREE;
+        tc_bus[slot].flags |= IN_USE;
+}
+
+void release_tc_card(int slot)
+{
+        if (tc_bus[slot].flags & FREE) {
+                printk("release_tc_card: "
+                       "attempting to release a card already free\n");
+                return;
+        }
+        tc_bus[slot].flags &= ~IN_USE;
+        tc_bus[slot].flags |= FREE;
+}
+
+unsigned long get_tc_base_addr(int slot)
+{
+        return tc_bus[slot].base_addr;
+}
+
+unsigned long get_tc_irq_nr(int slot)
+{
+        return tc_bus[slot].interrupt;
+}
+
+unsigned long get_tc_speed(void)
+{
+        return 100000 * (10000 / (unsigned long)info->clk_period);
+}
+
+/*
+ * Probing for TURBOchannel modules
+ */
+static void __init tc_probe(unsigned long startaddr, unsigned long size,
+                            int slots)
+{
+        int i, slot, err;
+        long offset;
+        unsigned char pattern[4];
+        unsigned char *module;
+
+        for (slot = 0; slot < slots; slot++) {
+                module = (char *)(startaddr + slot * size);
+
+                offset = OLDCARD;
+
+                err = 0;
+                err |= get_dbe(pattern[0], module + OLDCARD + TC_PATTERN0);
+                err |= get_dbe(pattern[1], module + OLDCARD + TC_PATTERN1);
+                err |= get_dbe(pattern[2], module + OLDCARD + TC_PATTERN2);
+                err |= get_dbe(pattern[3], module + OLDCARD + TC_PATTERN3);
+                if (err)
+                        continue;
+
+                if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
+                    pattern[2] != 0xaa || pattern[3] != 0xff) {
+                        offset = NEWCARD;
+
+                        err = 0;
+                        err |= get_dbe(pattern[0], module + TC_PATTERN0);
+                        err |= get_dbe(pattern[1], module + TC_PATTERN1);
+                        err |= get_dbe(pattern[2], module + TC_PATTERN2);
+                        err |= get_dbe(pattern[3], module + TC_PATTERN3);
+                        if (err)
+                                continue;
+                }
+
+                if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
+                    pattern[2] != 0xaa || pattern[3] != 0xff)
+                        continue;
+
+                tc_bus[slot].base_addr = (unsigned long)module;
+                for(i = 0; i < 8; i++) {
+                        tc_bus[slot].firmware[i] =
+                                module[TC_FIRM_VER + offset + 4 * i];
+                        tc_bus[slot].vendor[i] =
+                                module[TC_VENDOR + offset + 4 * i];
+                        tc_bus[slot].name[i] =
+                                module[TC_MODULE + offset + 4 * i];
+                }
+                tc_bus[slot].firmware[8] = 0;
+                tc_bus[slot].vendor[8] = 0;
+                tc_bus[slot].name[8] = 0;
+                /*
+                 * Looks unneccesary, but we may change
+                 * TC? in the future
+                 */
+                switch (slot) {
+                case 0:
+                        tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC0];
+                        break;
+                case 1:
+                        tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC1];
+                        break;
+                case 2:
+                        tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC2];
+                        break;
+                /*
+                 * Yuck! DS5000/200 onboard devices
+                 */
+                case 5:
+                        tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC5];
+                        break;
+                case 6:
+                        tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC6];
+                        break;
+                default:
+                        tc_bus[slot].interrupt = -1;
+                        break;
+                }
+        }
+}
+
+/*
+ * the main entry
+ */
+void __init tc_init(void)
+{
+        int tc_clock;
+        int i;
+        unsigned long slot0addr;
+        unsigned long slot_size;
+
+        if (!TURBOCHANNEL)
+                return;
+
+        for (i = 0; i < MAX_SLOT; i++) {
+                tc_bus[i].base_addr = 0;
+                tc_bus[i].name[0] = 0;
+                tc_bus[i].vendor[0] = 0;
+                tc_bus[i].firmware[0] = 0;
+                tc_bus[i].interrupt = -1;
+                tc_bus[i].flags = FREE;
+        }
+
+        info = (tcinfo *) rex_gettcinfo();
+        slot0addr = (unsigned long)KSEG1ADDR(rex_slot_address(0));
+
+        switch (mips_machtype) {
+        case MACH_DS5000_200:
+                num_tcslots = 7;
+                break;
+        case MACH_DS5000_1XX:
+        case MACH_DS5000_2X0:
+        case MACH_DS5900:
+                num_tcslots = 3;
+                break;
+        case MACH_DS5000_XX:
+        default:
+                num_tcslots = 2;
+                break;
+        }
+
+        tc_clock = 10000 / info->clk_period;
+
+        if (TURBOCHANNEL && info->slot_size && slot0addr) {
+                printk("TURBOchannel rev. %1d at %2d.%1d MHz ", info->revision,
+                        tc_clock / 10, tc_clock % 10);
+                printk("(with%s parity)\n", info->parity ? "" : "out");
+
+                slot_size = info->slot_size << 20;
+
+                tc_probe(slot0addr, slot_size, num_tcslots);
+
+                /*
+                 * All TURBOchannel DECstations have the onboard devices
+                 * where the (num_tcslots + 0 or 1 on DS5k/xx) Option Module
+                 * would be.
+                 */
+                if(mips_machtype == MACH_DS5000_XX)
+                        i = 1;
+                else
+                        i = 0;
+
+                system_base = slot0addr + slot_size * (num_tcslots + i);
+
+#ifdef TC_DEBUG
+                for (i = 0; i < num_tcslots; i++)
+                        if (tc_bus[i].base_addr) {
+                                printk("    slot %d: ", i);
+                                printk("%s %s %s\n", tc_bus[i].vendor,
+                                        tc_bus[i].name, tc_bus[i].firmware);
+                        }
+#endif
+                ioport_resource.end = KSEG2 - 1;
+        }
+}
+
+subsys_initcall(tc_init);
+
+EXPORT_SYMBOL(search_tc_card);
+EXPORT_SYMBOL(claim_tc_card);
+EXPORT_SYMBOL(release_tc_card);
+EXPORT_SYMBOL(get_tc_base_addr);
+EXPORT_SYMBOL(get_tc_irq_nr);
+EXPORT_SYMBOL(get_tc_speed);
+EXPORT_SYMBOL(system_base);