ARM: 7547/2: cache-l2x0: add support for Aurora L2 cache ctrl

Aurora Cache Controller was designed to be compatible with the ARM L2
Cache Controller. It comes with some difference or improvement such
as:
- no cache id part number available through hardware (need to get it
  by the DT).
- always write through mode available.
- two flavors of the controller outer cache and system cache (meaning
  maintenance operations on L1 are broadcasted to the L2 and L2
  performs the same operation).
- in outer cache mode, the cache maintenance operations are improved and
  can be done on a range inside a page and are not limited to a cache
  line.

Tested-and-Reviewed-by: Lior Amsalem <alior@marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Yehuda Yitschak <yehuday@marvell.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/hardware/cache-l2x0.h b/arch/arm/include/asm/hardware/cache-l2x0.h
index 5f2c7b44fdafb7272b8ad56538da57bf9db8e820..3b2c40b5bfa22de982fce4e79afc8ced0326dce1 100644 (file)
--- a/arch/arm/include/asm/hardware/cache-l2x0.h
+++ b/arch/arm/include/asm/hardware/cache-l2x0.h
@@ -102,6 +102,10 @@
 
 #define L2X0_ADDR_FILTER_EN            1
 
+#define L2X0_CTRL_EN                   1
+
+#define L2X0_WAY_SIZE_SHIFT            3
+
 #ifndef __ASSEMBLY__
 extern void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask);
 #if defined(CONFIG_CACHE_L2X0) && defined(CONFIG_OF)

diff --git a/arch/arm/mm/cache-aurora-l2.h b/arch/arm/mm/cache-aurora-l2.h
new file mode 100644 (file)
index 0000000..c861247
--- /dev/null
+++ b/arch/arm/mm/cache-aurora-l2.h
@@ -0,0 +1,55 @@
+/*
+ * AURORA shared L2 cache controller support
+ *
+ * Copyright (C) 2012 Marvell
+ *
+ * Yehuda Yitschak <yehuday@marvell.com>
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef __ASM_ARM_HARDWARE_AURORA_L2_H
+#define __ASM_ARM_HARDWARE_AURORA_L2_H
+
+#define AURORA_SYNC_REG                    0x700
+#define AURORA_RANGE_BASE_ADDR_REG  0x720
+#define AURORA_FLUSH_PHY_ADDR_REG   0x7f0
+#define AURORA_INVAL_RANGE_REG     0x774
+#define AURORA_CLEAN_RANGE_REG     0x7b4
+#define AURORA_FLUSH_RANGE_REG     0x7f4
+
+#define AURORA_ACR_REPLACEMENT_OFFSET      27
+#define AURORA_ACR_REPLACEMENT_MASK         \
+       (0x3 << AURORA_ACR_REPLACEMENT_OFFSET)
+#define AURORA_ACR_REPLACEMENT_TYPE_WAYRR    \
+       (0 << AURORA_ACR_REPLACEMENT_OFFSET)
+#define AURORA_ACR_REPLACEMENT_TYPE_LFSR     \
+       (1 << AURORA_ACR_REPLACEMENT_OFFSET)
+#define AURORA_ACR_REPLACEMENT_TYPE_SEMIPLRU \
+       (3 << AURORA_ACR_REPLACEMENT_OFFSET)
+
+#define AURORA_ACR_FORCE_WRITE_POLICY_OFFSET   0
+#define AURORA_ACR_FORCE_WRITE_POLICY_MASK     \
+       (0x3 << AURORA_ACR_FORCE_WRITE_POLICY_OFFSET)
+#define AURORA_ACR_FORCE_WRITE_POLICY_DIS      \
+       (0 << AURORA_ACR_FORCE_WRITE_POLICY_OFFSET)
+#define AURORA_ACR_FORCE_WRITE_BACK_POLICY     \
+       (1 << AURORA_ACR_FORCE_WRITE_POLICY_OFFSET)
+#define AURORA_ACR_FORCE_WRITE_THRO_POLICY     \
+       (2 << AURORA_ACR_FORCE_WRITE_POLICY_OFFSET)
+
+#define MAX_RANGE_SIZE         1024
+
+#define AURORA_WAY_SIZE_SHIFT  2
+
+#define AURORA_CTRL_FW         0x100
+
+/* chose a number outside L2X0_CACHE_ID_PART_MASK to be sure to make
+ * the distinction between a number coming from hardware and a number
+ * coming from the device tree */
+#define AURORA_CACHE_ID               0x100
+
+#endif /* __ASM_ARM_HARDWARE_AURORA_L2_H */

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index db55d18691ed1357f3971c39f7a7f6733bd67157..92ee4a075795344c2b25b45bafd06d91d5dfbaa6 100644 (file)
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -25,6 +25,7 @@
 
 #include <asm/cacheflush.h>
 #include <asm/hardware/cache-l2x0.h>
+#include "cache-aurora-l2.h"
 
 #define CACHE_LINE_SIZE                32
 
@@ -33,6 +34,11 @@ static DEFINE_RAW_SPINLOCK(l2x0_lock);
 static u32 l2x0_way_mask;      /* Bitmask of active ways */
 static u32 l2x0_size;
 static unsigned long sync_reg_offset = L2X0_CACHE_SYNC;
+static int l2_wt_override;
+
+/* Aurora don't have the cache ID register available, so we have to
+ * pass it though the device tree */
+static u32  cache_id_part_number_from_dt;
 
 struct l2x0_regs l2x0_saved_regs;
 
@@ -170,7 +176,7 @@ static void l2x0_inv_all(void)
        /* invalidate all ways */
        raw_spin_lock_irqsave(&l2x0_lock, flags);
        /* Invalidating when L2 is enabled is a nono */
-       BUG_ON(readl(l2x0_base + L2X0_CTRL) & 1);
+       BUG_ON(readl(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN);
        writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
        cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
        cache_sync();
@@ -294,11 +300,18 @@ static void l2x0_unlock(u32 cache_id)
        int lockregs;
        int i;
 
-       if (cache_id == L2X0_CACHE_ID_PART_L310)
+       switch (cache_id) {
+       case L2X0_CACHE_ID_PART_L310:
                lockregs = 8;
-       else
+               break;
+       case AURORA_CACHE_ID:
+               lockregs = 4;
+               break;
+       default:
                /* L210 and unknown types */
                lockregs = 1;
+               break;
+       }
 
        for (i = 0; i < lockregs; i++) {
                writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
@@ -314,18 +327,22 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
        u32 cache_id;
        u32 way_size = 0;
        int ways;
+       int way_size_shift = L2X0_WAY_SIZE_SHIFT;
        const char *type;
 
        l2x0_base = base;
-
-       cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
+       if (cache_id_part_number_from_dt)
+               cache_id = cache_id_part_number_from_dt;
+       else
+               cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID)
+                       & L2X0_CACHE_ID_PART_MASK;
        aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 
        aux &= aux_mask;
        aux |= aux_val;
 
        /* Determine the number of ways */
-       switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
+       switch (cache_id) {
        case L2X0_CACHE_ID_PART_L310:
                if (aux & (1 << 16))
                        ways = 16;
@@ -342,6 +359,14 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
                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;
@@ -355,7 +380,8 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
         * L2 cache Size =  Way size * Number of ways
         */
        way_size = (aux & L2X0_AUX_CTRL_WAY_SIZE_MASK) >> 17;
-       way_size = 1 << (way_size + 3);
+       way_size = 1 << (way_size + way_size_shift);
+
        l2x0_size = ways * way_size * SZ_1K;
 
        /*
@@ -363,7 +389,7 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
         * If you are booting from non-secure mode
         * accessing the below registers will fault.
         */
-       if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
+       if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
                /* Make sure that I&D is not locked down when starting */
                l2x0_unlock(cache_id);
 
@@ -373,7 +399,7 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
                l2x0_inv_all();
 
                /* enable L2X0 */
-               writel_relaxed(1, l2x0_base + L2X0_CTRL);
+               writel_relaxed(L2X0_CTRL_EN, l2x0_base + L2X0_CTRL);
        }
 
        /* Re-read it in case some bits are reserved. */
@@ -398,6 +424,98 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 }
 
 #ifdef CONFIG_OF
+/*
+ * Note that the end addresses passed to Linux primitives are
+ * noninclusive, while the hardware cache range operations use
+ * inclusive start and end addresses.
+ */
+static unsigned long calc_range_end(unsigned long start, unsigned long end)
+{
+       /*
+        * Limit the number of cache lines processed at once,
+        * since cache range operations stall the CPU pipeline
+        * until completion.
+        */
+       if (end > start + MAX_RANGE_SIZE)
+               end = start + MAX_RANGE_SIZE;
+
+       /*
+        * Cache range operations can't straddle a page boundary.
+        */
+       if (end > PAGE_ALIGN(start+1))
+               end = PAGE_ALIGN(start+1);
+
+       return end;
+}
+
+/*
+ * Make sure 'start' and 'end' reference the same page, as L2 is PIPT
+ * and range operations only do a TLB lookup on the start address.
+ */
+static void aurora_pa_range(unsigned long start, unsigned long end,
+                       unsigned long offset)
+{
+       unsigned long flags;
+
+       raw_spin_lock_irqsave(&l2x0_lock, flags);
+       writel(start, l2x0_base + AURORA_RANGE_BASE_ADDR_REG);
+       writel(end, l2x0_base + offset);
+       raw_spin_unlock_irqrestore(&l2x0_lock, flags);
+
+       cache_sync();
+}
+
+static void aurora_inv_range(unsigned long start, unsigned long end)
+{
+       /*
+        * round start and end adresses up to cache line size
+        */
+       start &= ~(CACHE_LINE_SIZE - 1);
+       end = ALIGN(end, CACHE_LINE_SIZE);
+
+       /*
+        * Invalidate all full cache lines between 'start' and 'end'.
+        */
+       while (start < end) {
+               unsigned long range_end = calc_range_end(start, end);
+               aurora_pa_range(start, range_end - CACHE_LINE_SIZE,
+                               AURORA_INVAL_RANGE_REG);
+               start = range_end;
+       }
+}
+
+static void aurora_clean_range(unsigned long start, unsigned long end)
+{
+       /*
+        * If L2 is forced to WT, the L2 will always be clean and we
+        * don't need to do anything here.
+        */
+       if (!l2_wt_override) {
+               start &= ~(CACHE_LINE_SIZE - 1);
+               end = ALIGN(end, CACHE_LINE_SIZE);
+               while (start != end) {
+                       unsigned long range_end = calc_range_end(start, end);
+                       aurora_pa_range(start, range_end - CACHE_LINE_SIZE,
+                                       AURORA_CLEAN_RANGE_REG);
+                       start = range_end;
+               }
+       }
+}
+
+static void aurora_flush_range(unsigned long start, unsigned long end)
+{
+       if (!l2_wt_override) {
+               start &= ~(CACHE_LINE_SIZE - 1);
+               end = ALIGN(end, CACHE_LINE_SIZE);
+               while (start != end) {
+                       unsigned long range_end = calc_range_end(start, end);
+                       aurora_pa_range(start, range_end - CACHE_LINE_SIZE,
+                                       AURORA_FLUSH_RANGE_REG);
+                       start = range_end;
+               }
+       }
+}
+
 static void __init l2x0_of_setup(const struct device_node *np,
                                 u32 *aux_val, u32 *aux_mask)
 {
@@ -495,9 +613,15 @@ static void __init pl310_save(void)
        }
 }
 
+static void aurora_save(void)
+{
+       l2x0_saved_regs.ctrl = readl_relaxed(l2x0_base + L2X0_CTRL);
+       l2x0_saved_regs.aux_ctrl = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
+}
+
 static void l2x0_resume(void)
 {
-       if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
+       if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
                /* restore aux ctrl and enable l2 */
                l2x0_unlock(readl_relaxed(l2x0_base + L2X0_CACHE_ID));
 
@@ -506,7 +630,7 @@ static void l2x0_resume(void)
 
                l2x0_inv_all();
 
-               writel_relaxed(1, l2x0_base + L2X0_CTRL);
+               writel_relaxed(L2X0_CTRL_EN, l2x0_base + L2X0_CTRL);
        }
 }
 
@@ -514,7 +638,7 @@ static void pl310_resume(void)
 {
        u32 l2x0_revision;
 
-       if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
+       if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
                /* restore pl310 setup */
                writel_relaxed(l2x0_saved_regs.tag_latency,
                        l2x0_base + L2X0_TAG_LATENCY_CTRL);
@@ -540,6 +664,46 @@ static void pl310_resume(void)
        l2x0_resume();
 }
 
+static void aurora_resume(void)
+{
+       if (!(readl(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
+               writel(l2x0_saved_regs.aux_ctrl, l2x0_base + L2X0_AUX_CTRL);
+               writel(l2x0_saved_regs.ctrl, l2x0_base + L2X0_CTRL);
+       }
+}
+
+static void __init aurora_broadcast_l2_commands(void)
+{
+       __u32 u;
+       /* Enable Broadcasting of cache commands to L2*/
+       __asm__ __volatile__("mrc p15, 1, %0, c15, c2, 0" : "=r"(u));
+       u |= AURORA_CTRL_FW;            /* Set the FW bit */
+       __asm__ __volatile__("mcr p15, 1, %0, c15, c2, 0\n" : : "r"(u));
+       isb();
+}
+
+static void __init aurora_of_setup(const struct device_node *np,
+                               u32 *aux_val, u32 *aux_mask)
+{
+       u32 val = AURORA_ACR_REPLACEMENT_TYPE_SEMIPLRU;
+       u32 mask =  AURORA_ACR_REPLACEMENT_MASK;
+
+       of_property_read_u32(np, "cache-id-part",
+                       &cache_id_part_number_from_dt);
+
+       /* Determine and save the write policy */
+       l2_wt_override = of_property_read_bool(np, "wt-override");
+
+       if (l2_wt_override) {
+               val |= AURORA_ACR_FORCE_WRITE_THRO_POLICY;
+               mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK;
+       }
+
+       *aux_val &= ~mask;
+       *aux_val |= val;
+       *aux_mask &= ~mask;
+}
+
 static const struct l2x0_of_data pl310_data = {
        .setup = pl310_of_setup,
        .save  = pl310_save,
@@ -571,10 +735,37 @@ static const struct l2x0_of_data l2x0_data = {
        },
 };
 
+static const struct l2x0_of_data aurora_with_outer_data = {
+       .setup = aurora_of_setup,
+       .save  = aurora_save,
+       .outer_cache = {
+               .resume      = aurora_resume,
+               .inv_range   = aurora_inv_range,
+               .clean_range = aurora_clean_range,
+               .flush_range = aurora_flush_range,
+               .sync        = l2x0_cache_sync,
+               .flush_all   = l2x0_flush_all,
+               .inv_all     = l2x0_inv_all,
+               .disable     = l2x0_disable,
+       },
+};
+
+static const struct l2x0_of_data aurora_no_outer_data = {
+       .setup = aurora_of_setup,
+       .save  = aurora_save,
+       .outer_cache = {
+               .resume      = aurora_resume,
+       },
+};
+
 static const struct of_device_id l2x0_ids[] __initconst = {
        { .compatible = "arm,pl310-cache", .data = (void *)&pl310_data },
        { .compatible = "arm,l220-cache", .data = (void *)&l2x0_data },
        { .compatible = "arm,l210-cache", .data = (void *)&l2x0_data },
+       { .compatible = "marvell,aurora-system-cache",
+         .data = (void *)&aurora_no_outer_data},
+       { .compatible = "marvell,aurora-outer-cache",
+         .data = (void *)&aurora_with_outer_data},
        {}
 };
 
@@ -600,9 +791,14 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
        data = of_match_node(l2x0_ids, np)->data;
 
        /* L2 configuration can only be changed if the cache is disabled */
-       if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
+       if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
                if (data->setup)
                        data->setup(np, &aux_val, &aux_mask);
+
+               /* For aurora cache in no outer mode select the
+                * correct mode using the coprocessor*/
+               if (data == &aurora_no_outer_data)
+                       aurora_broadcast_l2_commands();
        }
 
        if (data->save)