[PATCH 24/97] ARM: l2c: implement fixups for L2 cache controller quirks/errata
Russell King
rmk+kernel at arm.linux.org.uk
Mon Apr 28 12:28:10 PDT 2014
Rather than putting quirk handling in __l2c_init(), move it out to a
separate function which individual implementations can specify. This
helps to localise the quirks to those implementations which require
them.
Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
---
arch/arm/mm/cache-l2x0.c | 112 ++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 101 insertions(+), 11 deletions(-)
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 5f381af1a7a4..a544f19c448f 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -32,6 +32,7 @@ struct l2c_init_data {
unsigned num_lock;
void (*of_parse)(const struct device_node *, u32 *, u32 *);
void (*enable)(void __iomem *, u32, unsigned);
+ void (*fixup)(void __iomem *, u32, struct outer_cache_fns *);
void (*save)(void __iomem *);
struct outer_cache_fns outer_cache;
};
@@ -394,9 +395,80 @@ static const struct l2c_init_data l2x0_init_fns __initconst = {
},
};
+/*
+ * L2C-310 specific code.
+ *
+ * Errata:
+ * 588369: PL310 R0P0->R1P0, fixed R2P0.
+ * Affects: all clean+invalidate operations
+ * clean and invalidate skips the invalidate step, so we need to issue
+ * separate operations. We also require the above debug workaround
+ * enclosing this code fragment on affected parts. On unaffected parts,
+ * we must not use this workaround without the debug register writes
+ * to avoid exposing a problem similar to 727915.
+ *
+ * 727915: PL310 R2P0->R3P0, fixed R3P1.
+ * Affects: clean+invalidate by way
+ * clean and invalidate by way runs in the background, and a store can
+ * hit the line between the clean operation and invalidate operation,
+ * resulting in the store being lost.
+ *
+ * 753970: PL310 R3P0, fixed R3P1.
+ * Affects: sync
+ * prevents merging writes after the sync operation, until another L2C
+ * operation is performed (or a number of other conditions.)
+ *
+ * 769419: PL310 R0P0->R3P1, fixed R3P2.
+ * Affects: store buffer
+ * store buffer is not automatically drained.
+ */
+static void __init l2c310_fixup(void __iomem *base, u32 cache_id,
+ struct outer_cache_fns *fns)
+{
+ unsigned revision = cache_id & L2X0_CACHE_ID_RTL_MASK;
+ const char *errata[4];
+ unsigned n = 0;
+
+ if (revision <= L310_CACHE_ID_RTL_R3P0)
+ fns->set_debug = pl310_set_debug;
+
+ if (IS_ENABLED(CONFIG_PL310_ERRATA_753970) &&
+ revision == L310_CACHE_ID_RTL_R3P0) {
+ sync_reg_offset = L2X0_DUMMY_REG;
+ errata[n++] = "753970";
+ }
+
+ if (IS_ENABLED(CONFIG_PL310_ERRATA_769419))
+ errata[n++] = "769419";
+
+ if (n) {
+ unsigned i;
+
+ pr_info("L2C-310 errat%s", n > 1 ? "a" : "um");
+ for (i = 0; i < n; i++)
+ pr_cont(" %s", errata[i]);
+ pr_cont(" enabled\n");
+ }
+}
+
+static const struct l2c_init_data l2c310_init_fns __initconst = {
+ .num_lock = 8,
+ .enable = l2c_enable,
+ .fixup = l2c310_fixup,
+ .outer_cache = {
+ .inv_range = l2x0_inv_range,
+ .clean_range = l2x0_clean_range,
+ .flush_range = l2x0_flush_range,
+ .flush_all = l2x0_flush_all,
+ .disable = l2x0_disable,
+ .sync = l2x0_cache_sync,
+ },
+};
+
static void __init __l2c_init(const struct l2c_init_data *data,
u32 aux_val, u32 aux_mask, u32 cache_id)
{
+ struct outer_cache_fns fns;
u32 aux;
u32 way_size = 0;
int ways;
@@ -423,23 +495,20 @@ static void __init __l2c_init(const struct l2c_init_data *data,
else
ways = 8;
type = "L310";
-#ifdef CONFIG_PL310_ERRATA_753970
- /* Unmapped register. */
- sync_reg_offset = L2X0_DUMMY_REG;
-#endif
break;
+
case L2X0_CACHE_ID_PART_L210:
ways = (aux >> 13) & 0xf;
type = "L210";
break;
case AURORA_CACHE_ID:
- sync_reg_offset = AURORA_SYNC_REG;
ways = (aux >> 13) & 0xf;
ways = 2 << ((ways + 1) >> 2);
way_size_shift = AURORA_WAY_SIZE_SHIFT;
type = "Aurora";
break;
+
default:
/* Assume unknown chips have 8 ways */
ways = 8;
@@ -457,6 +526,10 @@ static void __init __l2c_init(const struct l2c_init_data *data,
l2x0_size = ways * way_size * SZ_1K;
+ fns = data->outer_cache;
+ if (data->fixup)
+ data->fixup(l2x0_base, cache_id, &fns);
+
/*
* Check if l2x0 controller is already enabled. If we are booting
* in non-secure mode accessing the below registers will fault.
@@ -470,11 +543,7 @@ static void __init __l2c_init(const struct l2c_init_data *data,
/* Save the value for resuming. */
l2x0_saved_regs.aux_ctrl = aux;
- outer_cache = data->outer_cache;
-
- if ((cache_id & L2X0_CACHE_ID_PART_MASK) == L2X0_CACHE_ID_PART_L310 &&
- (cache_id & L2X0_CACHE_ID_RTL_MASK) <= L310_CACHE_ID_RTL_R3P0)
- outer_cache.set_debug = pl310_set_debug;
+ outer_cache = fns;
pr_info("%s cache controller enabled\n", type);
pr_info("l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d kB\n",
@@ -483,13 +552,24 @@ static void __init __l2c_init(const struct l2c_init_data *data,
void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
{
+ const struct l2c_init_data *data;
u32 cache_id;
l2x0_base = base;
cache_id = readl_relaxed(base + L2X0_CACHE_ID);
- __l2c_init(&l2x0_init_fns, aux_val, aux_mask, cache_id);
+ switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
+ default:
+ data = &l2x0_init_fns;
+ break;
+
+ case L2X0_CACHE_ID_PART_L310:
+ data = &l2c310_init_fns;
+ break;
+ }
+
+ __l2c_init(data, aux_val, aux_mask, cache_id);
}
#ifdef CONFIG_OF
@@ -659,6 +739,7 @@ static const struct l2c_init_data of_pl310_data __initconst = {
.num_lock = 8,
.of_parse = pl310_of_parse,
.enable = l2c_enable,
+ .fixup = l2c310_fixup,
.save = pl310_save,
.outer_cache = {
.inv_range = l2x0_inv_range,
@@ -802,6 +883,12 @@ static void __init aurora_enable_no_outer(void __iomem *base, u32 aux,
l2c_enable(base, aux, num_lock);
}
+static void __init aurora_fixup(void __iomem *base, u32 cache_id,
+ struct outer_cache_fns *fns)
+{
+ sync_reg_offset = AURORA_SYNC_REG;
+}
+
static void __init aurora_of_parse(const struct device_node *np,
u32 *aux_val, u32 *aux_mask)
{
@@ -828,6 +915,7 @@ static const struct l2c_init_data of_aurora_with_outer_data __initconst = {
.num_lock = 4,
.of_parse = aurora_of_parse,
.enable = l2c_enable,
+ .fixup = aurora_fixup,
.save = aurora_save,
.outer_cache = {
.inv_range = aurora_inv_range,
@@ -844,6 +932,7 @@ static const struct l2c_init_data of_aurora_no_outer_data __initconst = {
.num_lock = 4,
.of_parse = aurora_of_parse,
.enable = aurora_enable_no_outer,
+ .fixup = aurora_fixup,
.save = aurora_save,
.outer_cache = {
.resume = aurora_resume,
@@ -995,6 +1084,7 @@ static const struct l2c_init_data of_bcm_l2x0_data __initconst = {
.num_lock = 8,
.of_parse = pl310_of_parse,
.enable = l2c_enable,
+ .fixup = l2c310_fixup,
.save = pl310_save,
.outer_cache = {
.inv_range = bcm_inv_range,
--
1.8.3.1
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