1 files changed, 208 insertions, 0 deletions

diff --git a/arch/mips/sgi-ip22/ip22-mc.c b/arch/mips/sgi-ip22/ip22-mc.c
new file mode 100644
index 000000000000..b58bd522262b
--- /dev/null
+++ b/arch/mips/sgi-ip22/ip22-mc.c
@@ -0,0 +1,208 @@
+/*
+ * ip22-mc.c: Routines for manipulating SGI Memory Controller.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu) - Indigo2 changes
+ * Copyright (C) 2003 Ladislav Michl  (ladis@linux-mips.org)
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include <asm/io.h>
+#include <asm/bootinfo.h>
+#include <asm/sgialib.h>
+#include <asm/sgi/mc.h>
+#include <asm/sgi/hpc3.h>
+#include <asm/sgi/ip22.h>
+
+struct sgimc_regs *sgimc;
+
+EXPORT_SYMBOL(sgimc);
+
+static inline unsigned long get_bank_addr(unsigned int memconfig)
+{
+        return ((memconfig & SGIMC_MCONFIG_BASEADDR) <<
+                ((sgimc->systemid & SGIMC_SYSID_MASKREV) >= 5 ? 24 : 22));
+}
+
+static inline unsigned long get_bank_size(unsigned int memconfig)
+{
+        return ((memconfig & SGIMC_MCONFIG_RMASK) + 0x0100) <<
+                ((sgimc->systemid & SGIMC_SYSID_MASKREV) >= 5 ? 16 : 14);
+}
+
+static inline unsigned int get_bank_config(int bank)
+{
+        unsigned int res = bank > 1 ? sgimc->mconfig1 : sgimc->mconfig0;
+        return bank % 2 ? res & 0xffff : res >> 16;
+}
+
+struct mem {
+        unsigned long addr;
+        unsigned long size;
+};
+
+/*
+ * Detect installed memory, do some sanity checks and notify kernel about it
+ */
+static void probe_memory(void)
+{
+        int i, j, found, cnt = 0;
+        struct mem bank[4];
+        struct mem space[2] = {{SGIMC_SEG0_BADDR, 0}, {SGIMC_SEG1_BADDR, 0}};
+
+        printk(KERN_INFO "MC: Probing memory configuration:\n");
+        for (i = 0; i < ARRAY_SIZE(bank); i++) {
+                unsigned int tmp = get_bank_config(i);
+                if (!(tmp & SGIMC_MCONFIG_BVALID))
+                        continue;
+
+                bank[cnt].size = get_bank_size(tmp);
+                bank[cnt].addr = get_bank_addr(tmp);
+                printk(KERN_INFO " bank%d: %3ldM @ %08lx\n",
+                        i, bank[cnt].size / 1024 / 1024, bank[cnt].addr);
+                cnt++;
+        }
+
+        /* And you thought bubble sort is dead algorithm... */
+        do {
+                unsigned long addr, size;
+
+                found = 0;
+                for (i = 1; i < cnt; i++)
+                        if (bank[i-1].addr > bank[i].addr) {
+                                addr = bank[i].addr;
+                                size = bank[i].size;
+                                bank[i].addr = bank[i-1].addr;
+                                bank[i].size = bank[i-1].size;
+                                bank[i-1].addr = addr;
+                                bank[i-1].size = size;
+                                found = 1;
+                        }
+        } while (found);
+
+        /* Figure out how are memory banks mapped into spaces */
+        for (i = 0; i < cnt; i++) {
+                found = 0;
+                for (j = 0; j < ARRAY_SIZE(space) && !found; j++)
+                        if (space[j].addr + space[j].size == bank[i].addr) {
+                                space[j].size += bank[i].size;
+                                found = 1;
+                        }
+                /* There is either hole or overlapping memory */
+                if (!found)
+                        printk(KERN_CRIT "MC: Memory configuration mismatch "
+                                         "(%08lx), expect Bus Error soon\n",
+                                         bank[i].addr);
+        }
+
+        for (i = 0; i < ARRAY_SIZE(space); i++)
+                if (space[i].size)
+                        add_memory_region(space[i].addr, space[i].size,
+                                          BOOT_MEM_RAM);
+}
+
+void __init sgimc_init(void)
+{
+        u32 tmp;
+
+        /* ioremap can't fail */
+        sgimc = (struct sgimc_regs *)
+                ioremap(SGIMC_BASE, sizeof(struct sgimc_regs));
+
+        printk(KERN_INFO "MC: SGI memory controller Revision %d\n",
+               (int) sgimc->systemid & SGIMC_SYSID_MASKREV);
+
+        /* Place the MC into a known state.  This must be done before
+         * interrupts are first enabled etc.
+         */
+
+        /* Step 0: Make sure we turn off the watchdog in case it's
+         *         still running (which might be the case after a
+         *         soft reboot).
+         */
+        tmp = sgimc->cpuctrl0;
+        tmp &= ~SGIMC_CCTRL0_WDOG;
+        sgimc->cpuctrl0 = tmp;
+
+        /* Step 1: The CPU/GIO error status registers will not latch
+         *         up a new error status until the register has been
+         *         cleared by the cpu.  These status registers are
+         *         cleared by writing any value to them.
+         */
+        sgimc->cstat = sgimc->gstat = 0;
+
+        /* Step 2: Enable all parity checking in cpu control register
+         *         zero.
+         */
+        tmp = sgimc->cpuctrl0;
+        tmp |= (SGIMC_CCTRL0_EPERRGIO | SGIMC_CCTRL0_EPERRMEM |
+                SGIMC_CCTRL0_R4KNOCHKPARR);
+        sgimc->cpuctrl0 = tmp;
+
+        /* Step 3: Setup the MC write buffer depth, this is controlled
+         *         in cpu control register 1 in the lower 4 bits.
+         */
+        tmp = sgimc->cpuctrl1;
+        tmp &= ~0xf;
+        tmp |= 0xd;
+        sgimc->cpuctrl1 = tmp;
+
+        /* Step 4: Initialize the RPSS divider register to run as fast
+         *         as it can correctly operate.  The register is laid
+         *         out as follows:
+         *
+         *         ----------------------------------------
+         *         |  RESERVED  |   INCREMENT   | DIVIDER |
+         *         ----------------------------------------
+         *          31        16 15            8 7       0
+         *
+         *         DIVIDER determines how often a 'tick' happens,
+         *         INCREMENT determines by how the RPSS increment
+         *         registers value increases at each 'tick'. Thus,
+         *         for IP22 we get INCREMENT=1, DIVIDER=1 == 0x101
+         */
+        sgimc->divider = 0x101;
+
+        /* Step 5: Initialize GIO64 arbitrator configuration register.
+         *
+         * NOTE: HPC init code in sgihpc_init() must run before us because
+         *       we need to know Guiness vs. FullHouse and the board
+         *       revision on this machine. You have been warned.
+         */
+
+        /* First the basic invariants across all GIO64 implementations. */
+        tmp = SGIMC_GIOPAR_HPC64;       /* All 1st HPC's interface at 64bits */
+        tmp |= SGIMC_GIOPAR_ONEBUS;     /* Only one physical GIO bus exists */
+
+        if (ip22_is_fullhouse()) {
+                /* Fullhouse specific settings. */
+                if (SGIOC_SYSID_BOARDREV(sgioc->sysid) < 2) {
+                        tmp |= SGIMC_GIOPAR_HPC264;     /* 2nd HPC at 64bits */
+                        tmp |= SGIMC_GIOPAR_PLINEEXP0;  /* exp0 pipelines */
+                        tmp |= SGIMC_GIOPAR_MASTEREXP1; /* exp1 masters */
+                        tmp |= SGIMC_GIOPAR_RTIMEEXP0;  /* exp0 is realtime */
+                } else {
+                        tmp |= SGIMC_GIOPAR_HPC264;     /* 2nd HPC 64bits */
+                        tmp |= SGIMC_GIOPAR_PLINEEXP0;  /* exp[01] pipelined */
+                        tmp |= SGIMC_GIOPAR_PLINEEXP1;
+                        tmp |= SGIMC_GIOPAR_MASTEREISA; /* EISA masters */
+                        tmp |= SGIMC_GIOPAR_GFX64;      /* GFX at 64 bits */
+                }
+        } else {
+                /* Guiness specific settings. */
+                tmp |= SGIMC_GIOPAR_EISA64;     /* MC talks to EISA at 64bits */
+                tmp |= SGIMC_GIOPAR_MASTEREISA; /* EISA bus can act as master */
+        }
+        sgimc->giopar = tmp;    /* poof */
+
+        probe_memory();
+}
+
+void __init prom_meminit(void) {}
+unsigned long __init prom_free_prom_memory(void)
+{
+        return 0;
+}