Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 177 insertions, 0 deletions

diff --git a/arch/mips/mm/sc-ip22.c b/arch/mips/mm/sc-ip22.c
new file mode 100644
index 000000000000..d236cf8b7374
--- /dev/null
+++ b/arch/mips/mm/sc-ip22.c
@@ -0,0 +1,177 @@
+/*
+ * sc-ip22.c: Indy cache management functions.
+ *
+ * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
+ * derived from r4xx0.c by David S. Miller (dm@engr.sgi.com).
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+
+#include <asm/bcache.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/bootinfo.h>
+#include <asm/sgi/ip22.h>
+#include <asm/sgi/mc.h>
+
+/* Secondary cache size in bytes, if present.  */
+static unsigned long scache_size;
+
+#undef DEBUG_CACHE
+
+#define SC_SIZE 0x00080000
+#define SC_LINE 32
+#define CI_MASK (SC_SIZE - SC_LINE)
+#define SC_INDEX(n) ((n) & CI_MASK)
+
+static inline void indy_sc_wipe(unsigned long first, unsigned long last)
+{
+        unsigned long tmp;
+
+        __asm__ __volatile__(
+        ".set\tpush\t\t\t# indy_sc_wipe\n\t"
+        ".set\tnoreorder\n\t"
+        ".set\tmips3\n\t"
+        ".set\tnoat\n\t"
+        "mfc0\t%2, $12\n\t"
+        "li\t$1, 0x80\t\t\t# Go 64 bit\n\t"
+        "mtc0\t$1, $12\n\t"
+
+        "dli\t$1, 0x9000000080000000\n\t"
+        "or\t%0, $1\t\t\t# first line to flush\n\t"
+        "or\t%1, $1\t\t\t# last line to flush\n\t"
+        ".set\tat\n\t"
+
+        "1:\tsw\t$0, 0(%0)\n\t"
+        "bne\t%0, %1, 1b\n\t"
+        " daddu\t%0, 32\n\t"
+
+        "mtc0\t%2, $12\t\t\t# Back to 32 bit\n\t"
+        "nop; nop; nop; nop;\n\t"
+        ".set\tpop"
+        : "=r" (first), "=r" (last), "=&r" (tmp)
+        : "0" (first), "1" (last));
+}
+
+static void indy_sc_wback_invalidate(unsigned long addr, unsigned long size)
+{
+        unsigned long first_line, last_line;
+        unsigned long flags;
+
+#ifdef DEBUG_CACHE
+        printk("indy_sc_wback_invalidate[%08lx,%08lx]", addr, size);
+#endif
+
+        /* Catch bad driver code */
+        BUG_ON(size == 0);
+
+        /* Which lines to flush?  */
+        first_line = SC_INDEX(addr);
+        last_line = SC_INDEX(addr + size - 1);
+
+        local_irq_save(flags);
+        if (first_line <= last_line) {
+                indy_sc_wipe(first_line, last_line);
+                goto out;
+        }
+
+        indy_sc_wipe(first_line, SC_SIZE - SC_LINE);
+        indy_sc_wipe(0, last_line);
+out:
+        local_irq_restore(flags);
+}
+
+static void indy_sc_enable(void)
+{
+        unsigned long addr, tmp1, tmp2;
+
+        /* This is really cool... */
+#ifdef DEBUG_CACHE
+        printk("Enabling R4600 SCACHE\n");
+#endif
+        __asm__ __volatile__(
+        ".set\tpush\n\t"
+        ".set\tnoreorder\n\t"
+        ".set\tmips3\n\t"
+        "mfc0\t%2, $12\n\t"
+        "nop; nop; nop; nop;\n\t"
+        "li\t%1, 0x80\n\t"
+        "mtc0\t%1, $12\n\t"
+        "nop; nop; nop; nop;\n\t"
+        "li\t%0, 0x1\n\t"
+        "dsll\t%0, 31\n\t"
+        "lui\t%1, 0x9000\n\t"
+        "dsll32\t%1, 0\n\t"
+        "or\t%0, %1, %0\n\t"
+        "sb\t$0, 0(%0)\n\t"
+        "mtc0\t$0, $12\n\t"
+        "nop; nop; nop; nop;\n\t"
+        "mtc0\t%2, $12\n\t"
+        "nop; nop; nop; nop;\n\t"
+        ".set\tpop"
+        : "=r" (tmp1), "=r" (tmp2), "=r" (addr));
+}
+
+static void indy_sc_disable(void)
+{
+        unsigned long tmp1, tmp2, tmp3;
+
+#ifdef DEBUG_CACHE
+        printk("Disabling R4600 SCACHE\n");
+#endif
+        __asm__ __volatile__(
+        ".set\tpush\n\t"
+        ".set\tnoreorder\n\t"
+        ".set\tmips3\n\t"
+        "li\t%0, 0x1\n\t"
+        "dsll\t%0, 31\n\t"
+        "lui\t%1, 0x9000\n\t"
+        "dsll32\t%1, 0\n\t"
+        "or\t%0, %1, %0\n\t"
+        "mfc0\t%2, $12\n\t"
+        "nop; nop; nop; nop\n\t"
+        "li\t%1, 0x80\n\t"
+        "mtc0\t%1, $12\n\t"
+        "nop; nop; nop; nop\n\t"
+        "sh\t$0, 0(%0)\n\t"
+        "mtc0\t$0, $12\n\t"
+        "nop; nop; nop; nop\n\t"
+        "mtc0\t%2, $12\n\t"
+        "nop; nop; nop; nop\n\t"
+        ".set\tpop"
+        : "=r" (tmp1), "=r" (tmp2), "=r" (tmp3));
+}
+
+static inline int __init indy_sc_probe(void)
+{
+        unsigned int size = ip22_eeprom_read(&sgimc->eeprom, 17);
+        if (size == 0)
+                return 0;
+
+        size <<= PAGE_SHIFT;
+        printk(KERN_INFO "R4600/R5000 SCACHE size %dK, linesize 32 bytes.\n",
+               size >> 10);
+        scache_size = size;
+
+        return 1;
+}
+
+/* XXX Check with wje if the Indy caches can differenciate between
+   writeback + invalidate and just invalidate.  */
+struct bcache_ops indy_sc_ops = {
+        .bc_enable = indy_sc_enable,
+        .bc_disable = indy_sc_disable,
+        .bc_wback_inv = indy_sc_wback_invalidate,
+        .bc_inv = indy_sc_wback_invalidate
+};
+
+void __init indy_sc_init(void)
+{
+        if (indy_sc_probe()) {
+                indy_sc_enable();
+                bcops = &indy_sc_ops;
+        }
+}