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authorRussell King <rmk+kernel@arm.linux.org.uk>2014-03-15 18:55:53 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-05-30 00:48:15 +0100
commit6a28cf59ff1144398d9d32d409ed8cbf1215922d (patch)
treee7f8469ba2efaac1b6d6e2ad45f164eef8b96c77 /arch/arm/mm
parentbda0b74e6a5a4ce25198f55889bb321532c63d92 (diff)
downloadop-kernel-dev-6a28cf59ff1144398d9d32d409ed8cbf1215922d.zip
op-kernel-dev-6a28cf59ff1144398d9d32d409ed8cbf1215922d.tar.gz
ARM: l2c: add L2C-210 specific handlers
Add L2C-210 specific cache operation handlers. These are tailored to the requirements of the L2C-210 cache controller, which doesn't require any workarounds. We avoid using the way operations during normal operation, which means we can avoid locking: the only time we use the way operations are during initialisation, and when disabling the cache. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm')
-rw-r--r--arch/arm/mm/cache-l2x0.c123
1 files changed, 122 insertions, 1 deletions
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 9586be7..d07fa4f 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -389,6 +389,108 @@ static const struct l2c_init_data l2x0_init_fns __initconst = {
};
/*
+ * L2C-210 specific code.
+ *
+ * The L2C-2x0 PA, set/way and sync operations are atomic, but we must
+ * ensure that no background operation is running. The way operations
+ * are all background tasks.
+ *
+ * While a background operation is in progress, any new operation is
+ * ignored (unspecified whether this causes an error.) Thankfully, not
+ * used on SMP.
+ *
+ * Never has a different sync register other than L2X0_CACHE_SYNC, but
+ * we use sync_reg_offset here so we can share some of this with L2C-310.
+ */
+static void __l2c210_cache_sync(void __iomem *base)
+{
+ writel_relaxed(0, base + sync_reg_offset);
+}
+
+static void __l2c210_op_pa_range(void __iomem *reg, unsigned long start,
+ unsigned long end)
+{
+ while (start < end) {
+ writel_relaxed(start, reg);
+ start += CACHE_LINE_SIZE;
+ }
+}
+
+static void l2c210_inv_range(unsigned long start, unsigned long end)
+{
+ void __iomem *base = l2x0_base;
+
+ if (start & (CACHE_LINE_SIZE - 1)) {
+ start &= ~(CACHE_LINE_SIZE - 1);
+ writel_relaxed(start, base + L2X0_CLEAN_INV_LINE_PA);
+ start += CACHE_LINE_SIZE;
+ }
+
+ if (end & (CACHE_LINE_SIZE - 1)) {
+ end &= ~(CACHE_LINE_SIZE - 1);
+ writel_relaxed(end, base + L2X0_CLEAN_INV_LINE_PA);
+ }
+
+ __l2c210_op_pa_range(base + L2X0_INV_LINE_PA, start, end);
+ __l2c210_cache_sync(base);
+}
+
+static void l2c210_clean_range(unsigned long start, unsigned long end)
+{
+ void __iomem *base = l2x0_base;
+
+ start &= ~(CACHE_LINE_SIZE - 1);
+ __l2c210_op_pa_range(base + L2X0_CLEAN_LINE_PA, start, end);
+ __l2c210_cache_sync(base);
+}
+
+static void l2c210_flush_range(unsigned long start, unsigned long end)
+{
+ void __iomem *base = l2x0_base;
+
+ start &= ~(CACHE_LINE_SIZE - 1);
+ __l2c210_op_pa_range(base + L2X0_CLEAN_INV_LINE_PA, start, end);
+ __l2c210_cache_sync(base);
+}
+
+static void l2c210_flush_all(void)
+{
+ void __iomem *base = l2x0_base;
+
+ BUG_ON(!irqs_disabled());
+
+ __l2c_op_way(base + L2X0_CLEAN_INV_WAY);
+ __l2c210_cache_sync(base);
+}
+
+static void l2c210_sync(void)
+{
+ __l2c210_cache_sync(l2x0_base);
+}
+
+static void l2c210_resume(void)
+{
+ void __iomem *base = l2x0_base;
+
+ if (!(readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN))
+ l2c_enable(base, l2x0_saved_regs.aux_ctrl, 1);
+}
+
+static const struct l2c_init_data l2c210_data __initconst = {
+ .num_lock = 1,
+ .enable = l2c_enable,
+ .outer_cache = {
+ .inv_range = l2c210_inv_range,
+ .clean_range = l2c210_clean_range,
+ .flush_range = l2c210_flush_range,
+ .flush_all = l2c210_flush_all,
+ .disable = l2c_disable,
+ .sync = l2c210_sync,
+ .resume = l2c210_resume,
+ },
+};
+
+/*
* L2C-310 specific code.
*
* Errata:
@@ -623,6 +725,10 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
data = &l2x0_init_fns;
break;
+ case L2X0_CACHE_ID_PART_L210:
+ data = &l2c210_data;
+ break;
+
case L2X0_CACHE_ID_PART_L310:
data = &l2c310_init_fns;
break;
@@ -672,6 +778,21 @@ static void __init l2x0_of_parse(const struct device_node *np,
*aux_mask &= ~mask;
}
+static const struct l2c_init_data of_l2c210_data __initconst = {
+ .num_lock = 1,
+ .of_parse = l2x0_of_parse,
+ .enable = l2c_enable,
+ .outer_cache = {
+ .inv_range = l2c210_inv_range,
+ .clean_range = l2c210_clean_range,
+ .flush_range = l2c210_flush_range,
+ .flush_all = l2c210_flush_all,
+ .disable = l2c_disable,
+ .sync = l2c210_sync,
+ .resume = l2c210_resume,
+ },
+};
+
static const struct l2c_init_data of_l2x0_data __initconst = {
.of_parse = l2x0_of_parse,
.enable = l2x0_enable,
@@ -1117,7 +1238,7 @@ static const struct l2c_init_data of_tauros3_data __initconst = {
#define L2C_ID(name, fns) { .compatible = name, .data = (void *)&fns }
static const struct of_device_id l2x0_ids[] __initconst = {
- L2C_ID("arm,l210-cache", of_l2x0_data),
+ L2C_ID("arm,l210-cache", of_l2c210_data),
L2C_ID("arm,l220-cache", of_l2x0_data),
L2C_ID("arm,pl310-cache", of_pl310_data),
L2C_ID("brcm,bcm11351-a2-pl310-cache", of_bcm_l2x0_data),
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