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-rw-r--r--kernel/arch/mips/mti-malta/malta-memory.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/kernel/arch/mips/mti-malta/malta-memory.c b/kernel/arch/mips/mti-malta/malta-memory.c
new file mode 100644
index 000000000..b769657be
--- /dev/null
+++ b/kernel/arch/mips/mti-malta/malta-memory.c
@@ -0,0 +1,211 @@
+/*
+ * 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.
+ *
+ * PROM library functions for acquiring/using memory descriptors given to
+ * us from the YAMON.
+ *
+ * Copyright (C) 1999,2000,2012 MIPS Technologies, Inc.
+ * All rights reserved.
+ * Authors: Carsten Langgaard <carstenl@mips.com>
+ * Steven J. Hill <sjhill@mips.com>
+ */
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/string.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cdmm.h>
+#include <asm/maar.h>
+#include <asm/sections.h>
+#include <asm/fw/fw.h>
+
+static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS];
+
+/* determined physical memory size, not overridden by command line args */
+unsigned long physical_memsize = 0L;
+
+fw_memblock_t * __init fw_getmdesc(int eva)
+{
+ char *memsize_str, *ememsize_str = NULL, *ptr;
+ unsigned long memsize = 0, ememsize = 0;
+ static char cmdline[COMMAND_LINE_SIZE] __initdata;
+ int tmp;
+
+ /* otherwise look in the environment */
+
+ memsize_str = fw_getenv("memsize");
+ if (memsize_str) {
+ tmp = kstrtoul(memsize_str, 0, &memsize);
+ if (tmp)
+ pr_warn("Failed to read the 'memsize' env variable.\n");
+ }
+ if (eva) {
+ /* Look for ememsize for EVA */
+ ememsize_str = fw_getenv("ememsize");
+ if (ememsize_str) {
+ tmp = kstrtoul(ememsize_str, 0, &ememsize);
+ if (tmp)
+ pr_warn("Failed to read the 'ememsize' env variable.\n");
+ }
+ }
+ if (!memsize && !ememsize) {
+ pr_warn("memsize not set in YAMON, set to default (32Mb)\n");
+ physical_memsize = 0x02000000;
+ } else {
+ if (memsize > (256 << 20)) { /* memsize should be capped to 256M */
+ pr_warn("Unsupported memsize value (0x%lx) detected! "
+ "Using 0x10000000 (256M) instead\n",
+ memsize);
+ memsize = 256 << 20;
+ }
+ /* If ememsize is set, then set physical_memsize to that */
+ physical_memsize = ememsize ? : memsize;
+ }
+
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
+ word of physical memory */
+ physical_memsize -= PAGE_SIZE;
+#endif
+
+ /* Check the command line for a memsize directive that overrides
+ the physical/default amount */
+ strcpy(cmdline, arcs_cmdline);
+ ptr = strstr(cmdline, "memsize=");
+ if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
+ ptr = strstr(ptr, " memsize=");
+ /* And now look for ememsize */
+ if (eva) {
+ ptr = strstr(cmdline, "ememsize=");
+ if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
+ ptr = strstr(ptr, " ememsize=");
+ }
+
+ if (ptr)
+ memsize = memparse(ptr + 8 + (eva ? 1 : 0), &ptr);
+ else
+ memsize = physical_memsize;
+
+ /* Last 64K for HIGHMEM arithmetics */
+ if (memsize > 0x7fff0000)
+ memsize = 0x7fff0000;
+
+ memset(mdesc, 0, sizeof(mdesc));
+
+ mdesc[0].type = fw_dontuse;
+ mdesc[0].base = PHYS_OFFSET;
+ mdesc[0].size = 0x00001000;
+
+ mdesc[1].type = fw_code;
+ mdesc[1].base = mdesc[0].base + 0x00001000UL;
+ mdesc[1].size = 0x000ef000;
+
+ /*
+ * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
+ * south bridge and PCI access always forwarded to the ISA Bus and
+ * BIOSCS# is always generated.
+ * This mean that this area can't be used as DMA memory for PCI
+ * devices.
+ */
+ mdesc[2].type = fw_dontuse;
+ mdesc[2].base = mdesc[0].base + 0x000f0000UL;
+ mdesc[2].size = 0x00010000;
+
+ mdesc[3].type = fw_dontuse;
+ mdesc[3].base = mdesc[0].base + 0x00100000UL;
+ mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) -
+ 0x00100000UL;
+
+ mdesc[4].type = fw_free;
+ mdesc[4].base = mdesc[0].base + CPHYSADDR(PFN_ALIGN(&_end));
+ mdesc[4].size = memsize - CPHYSADDR(mdesc[4].base);
+
+ return &mdesc[0];
+}
+
+static void free_init_pages_eva_malta(void *begin, void *end)
+{
+ free_init_pages("unused kernel", __pa_symbol((unsigned long *)begin),
+ __pa_symbol((unsigned long *)end));
+}
+
+static int __init fw_memtype_classify(unsigned int type)
+{
+ switch (type) {
+ case fw_free:
+ return BOOT_MEM_RAM;
+ case fw_code:
+ return BOOT_MEM_ROM_DATA;
+ default:
+ return BOOT_MEM_RESERVED;
+ }
+}
+
+void __init fw_meminit(void)
+{
+ fw_memblock_t *p;
+
+ p = fw_getmdesc(config_enabled(CONFIG_EVA));
+ free_init_pages_eva = (config_enabled(CONFIG_EVA) ?
+ free_init_pages_eva_malta : NULL);
+
+ while (p->size) {
+ long type;
+ unsigned long base, size;
+
+ type = fw_memtype_classify(p->type);
+ base = p->base;
+ size = p->size;
+
+ add_memory_region(base, size, type);
+ p++;
+ }
+}
+
+void __init prom_free_prom_memory(void)
+{
+ unsigned long addr;
+ int i;
+
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
+ continue;
+
+ addr = boot_mem_map.map[i].addr;
+ free_init_pages("YAMON memory",
+ addr, addr + boot_mem_map.map[i].size);
+ }
+}
+
+unsigned platform_maar_init(unsigned num_pairs)
+{
+ phys_addr_t mem_end = (physical_memsize & ~0xffffull) - 1;
+ struct maar_config cfg[] = {
+ /* DRAM preceding I/O */
+ { 0x00000000, 0x0fffffff, MIPS_MAAR_S },
+
+ /* DRAM following I/O */
+ { 0x20000000, mem_end, MIPS_MAAR_S },
+
+ /* DRAM alias in upper half of physical */
+ { 0x80000000, 0x80000000 + mem_end, MIPS_MAAR_S },
+ };
+ unsigned i, num_cfg = ARRAY_SIZE(cfg);
+
+ /* If DRAM fits before I/O, drop the region following it */
+ if (physical_memsize <= 0x10000000) {
+ num_cfg--;
+ for (i = 1; i < num_cfg; i++)
+ cfg[i] = cfg[i + 1];
+ }
+
+ return maar_config(cfg, num_cfg, num_pairs);
+}
+
+phys_addr_t mips_cdmm_phys_base(void)
+{
+ /* This address is "typically unused" */
+ return 0x1fc10000;
+}