*
* Privileged Space Mapping Buffer (PMB) Support.
*
- * Copyright (C) 2005, 2006, 2007 Paul Mundt
- *
- * P1/P2 Section mapping definitions from map32.h, which was:
- *
- * Copyright 2003 (c) Lineo Solutions,Inc.
+ * Copyright (C) 2005 - 2010 Paul Mundt
+ * Copyright (C) 2010 Matt Fleming
*
* 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
if (pos < 0)
return ERR_PTR(pos);
} else {
- if (test_bit(entry, &pmb_map))
+ if (test_and_set_bit(entry, &pmb_map))
return ERR_PTR(-ENOSPC);
pos = entry;
}
static void __set_pmb_entry(unsigned long vpn, unsigned long ppn,
unsigned long flags, int pos)
{
- ctrl_outl(vpn | PMB_V, mk_pmb_addr(pos));
+ __raw_writel(vpn | PMB_V, mk_pmb_addr(pos));
#ifdef CONFIG_CACHE_WRITETHROUGH
/*
flags |= PMB_WT;
#endif
- ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos));
+ __raw_writel(ppn | flags | PMB_V, mk_pmb_data(pos));
}
-static void __uses_jump_to_uncached set_pmb_entry(struct pmb_entry *pmbe)
+static void set_pmb_entry(struct pmb_entry *pmbe)
{
jump_to_uncached();
__set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, pmbe->entry);
back_to_cached();
}
-static void __uses_jump_to_uncached clear_pmb_entry(struct pmb_entry *pmbe)
+static void clear_pmb_entry(struct pmb_entry *pmbe)
{
unsigned int entry = pmbe->entry;
unsigned long addr;
/* Clear V-bit */
addr = mk_pmb_addr(entry);
- ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
+ __raw_writel(__raw_readl(addr) & ~PMB_V, addr);
addr = mk_pmb_data(entry);
- ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
+ __raw_writel(__raw_readl(addr) & ~PMB_V, addr);
back_to_cached();
}
} while (pmbe);
}
-#ifdef CONFIG_PMB
-int __uses_jump_to_uncached pmb_init(void)
+static inline void
+pmb_log_mapping(unsigned long data_val, unsigned long vpn, unsigned long ppn)
{
- unsigned int i;
- long size, ret;
-
- jump_to_uncached();
-
- /*
- * Insert PMB entries for the P1 and P2 areas so that, after
- * we've switched the MMU to 32-bit mode, the semantics of P1
- * and P2 are the same as in 29-bit mode, e.g.
- *
- * P1 - provides a cached window onto physical memory
- * P2 - provides an uncached window onto physical memory
- */
- size = __MEMORY_START + __MEMORY_SIZE;
+ unsigned int size;
+ const char *sz_str;
- ret = pmb_remap(P1SEG, 0x00000000, size, PMB_C);
- BUG_ON(ret != size);
+ size = data_val & PMB_SZ_MASK;
- ret = pmb_remap(P2SEG, 0x00000000, size, PMB_WT | PMB_UB);
- BUG_ON(ret != size);
+ sz_str = (size == PMB_SZ_16M) ? " 16MB":
+ (size == PMB_SZ_64M) ? " 64MB":
+ (size == PMB_SZ_128M) ? "128MB":
+ "512MB";
- ctrl_outl(0, PMB_IRMCR);
-
- /* PMB.SE and UB[7] */
- ctrl_outl(PASCR_SE | (1 << 7), PMB_PASCR);
-
- /* Flush out the TLB */
- i = ctrl_inl(MMUCR);
- i |= MMUCR_TI;
- ctrl_outl(i, MMUCR);
-
- back_to_cached();
+ pr_info("\t0x%08lx -> 0x%08lx [ %s %scached ]\n",
+ vpn >> PAGE_SHIFT, ppn >> PAGE_SHIFT, sz_str,
+ (data_val & PMB_C) ? "" : "un");
+}
- return 0;
+static inline unsigned int pmb_ppn_in_range(unsigned long ppn)
+{
+ return ppn >= __pa(memory_start) && ppn < __pa(memory_end);
}
-#else
-int __uses_jump_to_uncached pmb_init(void)
+
+static int pmb_synchronize_mappings(void)
{
+ unsigned int applied = 0;
int i;
- unsigned long addr, data;
- jump_to_uncached();
+ pr_info("PMB: boot mappings:\n");
+ /*
+ * Run through the initial boot mappings, log the established
+ * ones, and blow away anything that falls outside of the valid
+ * PPN range. Specifically, we only care about existing mappings
+ * that impact the cached/uncached sections.
+ *
+ * Note that touching these can be a bit of a minefield; the boot
+ * loader can establish multi-page mappings with the same caching
+ * attributes, so we need to ensure that we aren't modifying a
+ * mapping that we're presently executing from, or may execute
+ * from in the case of straddling page boundaries.
+ *
+ * In the future we will have to tidy up after the boot loader by
+ * jumping between the cached and uncached mappings and tearing
+ * down alternating mappings while executing from the other.
+ */
for (i = 0; i < PMB_ENTRY_MAX; i++) {
+ unsigned long addr, data;
+ unsigned long addr_val, data_val;
+ unsigned long ppn, vpn, flags;
struct pmb_entry *pmbe;
- unsigned long vpn, ppn, flags;
- addr = PMB_DATA + (i << PMB_E_SHIFT);
- data = ctrl_inl(addr);
- if (!(data & PMB_V))
+ addr = mk_pmb_addr(i);
+ data = mk_pmb_data(i);
+
+ addr_val = __raw_readl(addr);
+ data_val = __raw_readl(data);
+
+ /*
+ * Skip over any bogus entries
+ */
+ if (!(data_val & PMB_V) || !(addr_val & PMB_V))
continue;
- if (data & PMB_C) {
+ ppn = data_val & PMB_PFN_MASK;
+ vpn = addr_val & PMB_PFN_MASK;
+
+ /*
+ * Only preserve in-range mappings.
+ */
+ if (!pmb_ppn_in_range(ppn)) {
+ /*
+ * Invalidate anything out of bounds.
+ */
+ __raw_writel(addr_val & ~PMB_V, addr);
+ __raw_writel(data_val & ~PMB_V, data);
+ continue;
+ }
+
+ /*
+ * Update the caching attributes if necessary
+ */
+ if (data_val & PMB_C) {
#if defined(CONFIG_CACHE_WRITETHROUGH)
- data |= PMB_WT;
+ data_val |= PMB_WT;
#elif defined(CONFIG_CACHE_WRITEBACK)
- data &= ~PMB_WT;
+ data_val &= ~PMB_WT;
#else
- data &= ~(PMB_C | PMB_WT);
+ data_val &= ~(PMB_C | PMB_WT);
#endif
+ __raw_writel(data_val, data);
}
- ctrl_outl(data, addr);
- ppn = data & PMB_PFN_MASK;
+ flags = data_val & (PMB_SZ_MASK | PMB_CACHE_MASK);
- flags = data & (PMB_C | PMB_WT | PMB_UB);
- flags |= data & PMB_SZ_MASK;
+ pmbe = pmb_alloc(vpn, ppn, flags, i);
+ if (IS_ERR(pmbe)) {
+ WARN_ON_ONCE(1);
+ continue;
+ }
- addr = PMB_ADDR + (i << PMB_E_SHIFT);
- data = ctrl_inl(addr);
+ pmb_log_mapping(data_val, vpn, ppn);
- vpn = data & PMB_PFN_MASK;
+ applied++;
+ }
- pmbe = pmb_alloc(vpn, ppn, flags, i);
- WARN_ON(IS_ERR(pmbe));
+ return (applied == 0);
+}
+
+int pmb_init(void)
+{
+ int ret;
+
+ jump_to_uncached();
+
+ /*
+ * Sync our software copy of the PMB mappings with those in
+ * hardware. The mappings in the hardware PMB were either set up
+ * by the bootloader or very early on by the kernel.
+ */
+ ret = pmb_synchronize_mappings();
+ if (unlikely(ret == 0)) {
+ back_to_cached();
+ return 0;
}
+ __raw_writel(0, PMB_IRMCR);
+
+ /* Flush out the TLB */
+ __raw_writel(__raw_readl(MMUCR) | MMUCR_TI, MMUCR);
+
back_to_cached();
return 0;
}
-#endif /* CONFIG_PMB */
+
+bool __in_29bit_mode(void)
+{
+ return (__raw_readl(PMB_PASCR) & PASCR_SE) == 0;
+}
static int pmb_seq_show(struct seq_file *file, void *iter)
{
unsigned int size;
char *sz_str = NULL;
- addr = ctrl_inl(mk_pmb_addr(i));
- data = ctrl_inl(mk_pmb_data(i));
+ addr = __raw_readl(mk_pmb_addr(i));
+ data = __raw_readl(mk_pmb_data(i));
size = data & PMB_SZ_MASK;
sz_str = (size == PMB_SZ_16M) ? " 16MB":
{
return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver);
}
-
subsys_initcall(pmb_sysdev_init);
#endif
projects / deliverable / linux.git / blobdiff