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authorLinus Torvalds <torvalds@linux-foundation.org>2014-06-29 13:40:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-29 13:40:08 -0700
commitef2e0391e531832eea96ed31cba5a131bdfe4149 (patch)
treec2e281387229046f763375c17aff42f0e14c81a1 /arch/arm/mm/cache-l2x0.c
parent97be078b87f82e49b3e7a46fa71e07b7829838d3 (diff)
parent42309ab450b608ddcfafa90e4cfa93a5001ecfba (diff)
downloadlinux-stericsson-ef2e0391e531832eea96ed31cba5a131bdfe4149.tar.gz
Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
Pull ARM fixes from Russell King: "Another round of ARM fixes. The largest change here is the L2 changes to work around problems for the Armada 37x/380 devices, where most of the size comes down to comments rather than code. The other significant fix here is for the ptrace code, to ensure that rewritten syscalls work as intended. This was pointed out by Kees Cook, but Will Deacon reworked the patch to be more elegant. The remainder are fairly trivial changes" * 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: ARM: 8087/1: ptrace: reload syscall number after secure_computing() check ARM: 8086/1: Set memblock limit for nommu ARM: 8085/1: sa1100: collie: add top boot mtd partition ARM: 8084/1: sa1100: collie: revert back to cfi_probe ARM: 8080/1: mcpm.h: remove unused variable declaration ARM: 8076/1: mm: add support for HW coherent systems in PL310 cache
Diffstat (limited to 'arch/arm/mm/cache-l2x0.c')
-rw-r--r--arch/arm/mm/cache-l2x0.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index efc5cabf70e0..076172b69422 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -1069,6 +1069,33 @@ static const struct l2c_init_data of_l2c310_data __initconst = {
};
/*
+ * This is a variant of the of_l2c310_data with .sync set to
+ * NULL. Outer sync operations are not needed when the system is I/O
+ * coherent, and potentially harmful in certain situations (PCIe/PL310
+ * deadlock on Armada 375/38x due to hardware I/O coherency). The
+ * other operations are kept because they are infrequent (therefore do
+ * not cause the deadlock in practice) and needed for secondary CPU
+ * boot and other power management activities.
+ */
+static const struct l2c_init_data of_l2c310_coherent_data __initconst = {
+ .type = "L2C-310 Coherent",
+ .way_size_0 = SZ_8K,
+ .num_lock = 8,
+ .of_parse = l2c310_of_parse,
+ .enable = l2c310_enable,
+ .fixup = l2c310_fixup,
+ .save = l2c310_save,
+ .outer_cache = {
+ .inv_range = l2c210_inv_range,
+ .clean_range = l2c210_clean_range,
+ .flush_range = l2c210_flush_range,
+ .flush_all = l2c210_flush_all,
+ .disable = l2c310_disable,
+ .resume = l2c310_resume,
+ },
+};
+
+/*
* Note that the end addresses passed to Linux primitives are
* noninclusive, while the hardware cache range operations use
* inclusive start and end addresses.
@@ -1487,6 +1514,10 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
data = of_match_node(l2x0_ids, np)->data;
+ if (of_device_is_compatible(np, "arm,pl310-cache") &&
+ of_property_read_bool(np, "arm,io-coherent"))
+ data = &of_l2c310_coherent_data;
+
old_aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
if (old_aux != ((old_aux & aux_mask) | aux_val)) {
pr_warn("L2C: platform modifies aux control register: 0x%08x -> 0x%08x\n",