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wii: use both mem1 and mem2 as ram
The Nintendo Wii video game console has two discontiguous RAM regions: - MEM1: 24MB @ 0x00000000 - MEM2: 64MB @ 0x10000000 Unfortunately, the kernel currently does not support discontiguous RAM memory regions on 32-bit PowerPC platforms. This patch adds a series of workarounds to allow the use of the second memory region (MEM2) as RAM by the kernel. Basically, a single range of memory from the beginning of MEM1 to the end of MEM2 is reported to the kernel, and a memory reservation is created for the hole between MEM1 and MEM2. With this patch the system is able to use all the available RAM and not just ~27% of it. This will no longer be needed when proper discontig memory support for 32-bit PowerPC is added to the kernel. Signed-off-by: Albert Herranz <albert_herranz@yahoo.es> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
parent
02d748a9ee
commit
de32400dd2
5 changed files with 106 additions and 7 deletions
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@ -131,9 +131,13 @@ void __init MMU_init(void)
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MMU_setup();
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if (lmb.memory.cnt > 1) {
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#ifndef CONFIG_WII
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lmb.memory.cnt = 1;
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lmb_analyze();
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printk(KERN_WARNING "Only using first contiguous memory region");
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#else
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wii_memory_fixups();
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#endif
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}
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total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr;
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@ -136,6 +136,14 @@ extern phys_addr_t total_lowmem;
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extern phys_addr_t memstart_addr;
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extern phys_addr_t lowmem_end_addr;
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#ifdef CONFIG_WII
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extern unsigned long wii_hole_start;
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extern unsigned long wii_hole_size;
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extern unsigned long wii_mmu_mapin_mem2(unsigned long top);
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extern void wii_memory_fixups(void);
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#endif
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/* ...and now those things that may be slightly different between processor
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* architectures. -- Dan
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*/
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@ -155,5 +163,5 @@ extern void adjust_total_lowmem(void);
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#elif defined(CONFIG_PPC32)
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/* anything 32-bit except 4xx or 8xx */
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extern void MMU_init_hw(void);
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extern unsigned long mmu_mapin_ram(void);
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extern unsigned long mmu_mapin_ram(unsigned long top);
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#endif
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@ -283,18 +283,18 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
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}
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/*
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* Map in a big chunk of physical memory starting at PAGE_OFFSET.
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* Map in a chunk of physical memory starting at start.
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*/
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void __init mapin_ram(void)
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void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
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{
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unsigned long v, s, f;
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phys_addr_t p;
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int ktext;
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s = mmu_mapin_ram();
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s = offset;
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v = PAGE_OFFSET + s;
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p = memstart_addr + s;
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for (; s < total_lowmem; s += PAGE_SIZE) {
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for (; s < top; s += PAGE_SIZE) {
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ktext = ((char *) v >= _stext && (char *) v < etext);
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f = ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL;
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map_page(v, p, f);
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@ -307,6 +307,30 @@ void __init mapin_ram(void)
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}
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}
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void __init mapin_ram(void)
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{
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unsigned long s, top;
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#ifndef CONFIG_WII
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top = total_lowmem;
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s = mmu_mapin_ram(top);
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__mapin_ram_chunk(s, top);
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#else
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if (!wii_hole_size) {
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s = mmu_mapin_ram(total_lowmem);
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__mapin_ram_chunk(s, total_lowmem);
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} else {
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top = wii_hole_start;
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s = mmu_mapin_ram(top);
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__mapin_ram_chunk(s, top);
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top = lmb_end_of_DRAM();
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s = wii_mmu_mapin_mem2(top);
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__mapin_ram_chunk(s, top);
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}
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#endif
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}
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/* Scan the real Linux page tables and return a PTE pointer for
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* a virtual address in a context.
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* Returns true (1) if PTE was found, zero otherwise. The pointer to
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@ -72,7 +72,7 @@ unsigned long p_mapped_by_bats(phys_addr_t pa)
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return 0;
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}
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unsigned long __init mmu_mapin_ram(void)
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unsigned long __init mmu_mapin_ram(unsigned long top)
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{
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unsigned long tot, bl, done;
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unsigned long max_size = (256<<20);
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@ -86,7 +86,7 @@ unsigned long __init mmu_mapin_ram(void)
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/* Make sure we don't map a block larger than the
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smallest alignment of the physical address. */
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tot = total_lowmem;
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tot = top;
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for (bl = 128<<10; bl < max_size; bl <<= 1) {
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if (bl * 2 > tot)
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break;
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@ -20,6 +20,8 @@
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#include <linux/seq_file.h>
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#include <linux/kexec.h>
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#include <linux/of_platform.h>
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#include <linux/lmb.h>
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#include <mm/mmu_decl.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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@ -52,6 +54,67 @@
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static void __iomem *hw_ctrl;
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static void __iomem *hw_gpio;
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unsigned long wii_hole_start;
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unsigned long wii_hole_size;
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static int __init page_aligned(unsigned long x)
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{
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return !(x & (PAGE_SIZE-1));
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}
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void __init wii_memory_fixups(void)
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{
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struct lmb_property *p = lmb.memory.region;
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/*
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* This is part of a workaround to allow the use of two
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* discontiguous RAM ranges on the Wii, even if this is
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* currently unsupported on 32-bit PowerPC Linux.
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*
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* We coealesce the two memory ranges of the Wii into a
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* single range, then create a reservation for the "hole"
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* between both ranges.
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*/
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BUG_ON(lmb.memory.cnt != 2);
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BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base));
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p[0].size = _ALIGN_DOWN(p[0].size, PAGE_SIZE);
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p[1].size = _ALIGN_DOWN(p[1].size, PAGE_SIZE);
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wii_hole_start = p[0].base + p[0].size;
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wii_hole_size = p[1].base - wii_hole_start;
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pr_info("MEM1: <%08llx %08llx>\n", p[0].base, p[0].size);
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pr_info("HOLE: <%08lx %08lx>\n", wii_hole_start, wii_hole_size);
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pr_info("MEM2: <%08llx %08llx>\n", p[1].base, p[1].size);
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p[0].size += wii_hole_size + p[1].size;
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lmb.memory.cnt = 1;
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lmb_analyze();
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/* reserve the hole */
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lmb_reserve(wii_hole_start, wii_hole_size);
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}
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unsigned long __init wii_mmu_mapin_mem2(unsigned long top)
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{
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unsigned long delta, size, bl;
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unsigned long max_size = (256<<20);
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/* MEM2 64MB@0x10000000 */
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delta = wii_hole_start + wii_hole_size;
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size = top - delta;
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for (bl = 128<<10; bl < max_size; bl <<= 1) {
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if (bl * 2 > size)
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break;
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}
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setbat(4, PAGE_OFFSET+delta, delta, bl, PAGE_KERNEL_X);
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return delta + bl;
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}
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static void wii_spin(void)
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{
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local_irq_disable();
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