[PATCH 1/3] ARM: uniphier: add outer cache support
From: Masahiro Yamada
Date: Sun Aug 23 2015 - 22:21:49 EST
This commit adds support for UniPhier outer cache controller.
All the UniPhier SoCs are equipped with the L2 cache, while the L3
cache is currently only integrated on PH1-Pro5 SoC.
Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---
.../bindings/arm/uniphier/cache-uniphier.txt | 30 ++
MAINTAINERS | 2 +
arch/arm/include/asm/hardware/cache-uniphier.h | 40 ++
arch/arm/mach-uniphier/uniphier.c | 11 +
arch/arm/mm/Kconfig | 10 +
arch/arm/mm/Makefile | 1 +
arch/arm/mm/cache-uniphier.c | 518 +++++++++++++++++++++
7 files changed, 612 insertions(+)
create mode 100644 Documentation/devicetree/bindings/arm/uniphier/cache-uniphier.txt
create mode 100644 arch/arm/include/asm/hardware/cache-uniphier.h
create mode 100644 arch/arm/mm/cache-uniphier.c
diff --git a/Documentation/devicetree/bindings/arm/uniphier/cache-uniphier.txt b/Documentation/devicetree/bindings/arm/uniphier/cache-uniphier.txt
new file mode 100644
index 0000000..6428289
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/uniphier/cache-uniphier.txt
@@ -0,0 +1,30 @@
+UniPhier outer cache controller
+
+UniPhier SoCs are integrated with a level 2 cache controller that resides
+outside of the ARM cores, some of them also have a level 3 cache controller.
+
+Required properties:
+- compatible: should be one of the followings:
+ "socionext,uniphier-l2-cache" (L2 cache)
+ "socionext,uniphier-l3-cache" (L3 cache)
+- reg: offsets and lengths of the register sets for the device. It should
+ contain 3 regions: control registers, revision registers, operation
+ registers, in this order.
+
+The L2 cache must exist to use the L3 cache; adding only an L3 cache device
+node to the device tree causes the initialization failure of the whole outer
+cache system.
+
+Example:
+ l2-cache@500c0000 {
+ compatible = "socionext,uniphier-l2-cache";
+ reg = <0x500c0000 0x2000>, <0x503c0100 0x8>,
+ <0x506c0000 0x400>;
+ };
+
+ /* Not all of UniPhier SoCs have L3 cache */
+ l3-cache@500c8000 {
+ compatible = "socionext,uniphier-l3-cache";
+ reg = <0x500c8000 0x2000>, <0x503c8100 0x8>,
+ <0x506c8000 0x400>;
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index a4fbfc8..62e0784 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1578,7 +1578,9 @@ M: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
L: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx (moderated for non-subscribers)
S: Maintained
F: arch/arm/boot/dts/uniphier*
+F: arch/arm/include/asm/hardware/cache-uniphier.h
F: arch/arm/mach-uniphier/
+F: arch/arm/mm/cache-uniphier.c
F: drivers/pinctrl/uniphier/
F: drivers/tty/serial/8250/8250_uniphier.c
N: uniphier
diff --git a/arch/arm/include/asm/hardware/cache-uniphier.h b/arch/arm/include/asm/hardware/cache-uniphier.h
new file mode 100644
index 0000000..641d32f
--- /dev/null
+++ b/arch/arm/include/asm/hardware/cache-uniphier.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __CACHE_UNIPHIER_H
+#define __CACHE_UNIPHIER_H
+
+#ifdef CONFIG_CACHE_UNIPHIER
+int uniphier_cache_init(void);
+int uniphier_cache_init_locked(void);
+void uniphier_cache_touch_range(unsigned long start, unsigned long end);
+#else
+static inline int uniphier_cache_init(void)
+{
+ return -ENODEV;
+}
+
+static inline int uniphier_cache_init_locked(void)
+{
+ return -ENODEV;
+}
+
+static inline void uniphier_cache_touch_range(unsigned long start,
+ unsigned long end)
+{
+}
+
+#endif
+
+#endif /* __CACHE_UNIPHIER_H */
diff --git a/arch/arm/mach-uniphier/uniphier.c b/arch/arm/mach-uniphier/uniphier.c
index 9be10ef..6aed136 100644
--- a/arch/arm/mach-uniphier/uniphier.c
+++ b/arch/arm/mach-uniphier/uniphier.c
@@ -12,6 +12,8 @@
* GNU General Public License for more details.
*/
+#include <linux/of_platform.h>
+#include <asm/hardware/cache-uniphier.h>
#include <asm/mach/arch.h>
static const char * const uniphier_dt_compat[] __initconst = {
@@ -25,6 +27,15 @@ static const char * const uniphier_dt_compat[] __initconst = {
NULL,
};
+static void __init uniphier_init_machine(void)
+{
+ if (uniphier_cache_init())
+ pr_warn("outer cache was not enabled");
+
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}
+
DT_MACHINE_START(UNIPHIER, "Socionext UniPhier")
.dt_compat = uniphier_dt_compat,
+ .init_machine = uniphier_init_machine,
MACHINE_END
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 7c6b976..7b33ff3 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -985,6 +985,16 @@ config CACHE_TAUROS2
This option enables the Tauros2 L2 cache controller (as
found on PJ1/PJ4).
+config CACHE_UNIPHIER
+ bool "Enable the UniPhier outer cache controller"
+ depends on ARCH_UNIPHIER
+ default y
+ select OUTER_CACHE
+ select OUTER_CACHE_SYNC
+ help
+ This option enables the UniPhier outer cache (system cache)
+ controller.
+
config CACHE_XSC3L2
bool "Enable the L2 cache on XScale3"
depends on CPU_XSC3
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index 57c8df5..7f76d96 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -103,3 +103,4 @@ obj-$(CONFIG_CACHE_FEROCEON_L2) += cache-feroceon-l2.o
obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o l2c-l2x0-resume.o
obj-$(CONFIG_CACHE_XSC3L2) += cache-xsc3l2.o
obj-$(CONFIG_CACHE_TAUROS2) += cache-tauros2.o
+obj-$(CONFIG_CACHE_UNIPHIER) += cache-uniphier.o
diff --git a/arch/arm/mm/cache-uniphier.c b/arch/arm/mm/cache-uniphier.c
new file mode 100644
index 0000000..9eb0665
--- /dev/null
+++ b/arch/arm/mm/cache-uniphier.c
@@ -0,0 +1,518 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <asm/hardware/cache-uniphier.h>
+#include <asm/outercache.h>
+
+/* control registers */
+#define UNIPHIER_SSCC 0x0 /* Control Register */
+#define UNIPHIER_SSCC_BST BIT(20) /* UCWG burst read */
+#define UNIPHIER_SSCC_ACT BIT(19) /* Inst-Data separate */
+#define UNIPHIER_SSCC_WTG BIT(18) /* WT gathering on */
+#define UNIPHIER_SSCC_PRD BIT(17) /* enable pre-fetch */
+#define UNIPHIER_SSCC_ON BIT(0) /* enable cache */
+#define UNIPHIER_SSCLPDAWCR 0x30 /* Unified/Data Active Way Control */
+#define UNIPHIER_SSCLPIAWCR 0x34 /* Instruction Active Way Control */
+
+/* revision registers */
+#define UNIPHIER_SSCID 0x0 /* ID Register */
+
+/* operation registers */
+#define UNIPHIER_SSCOPE 0x244 /* Cache Operation Primitive Entry */
+#define UNIPHIER_SSCOPE_CM_INV 0x0 /* invalidate */
+#define UNIPHIER_SSCOPE_CM_CLEAN 0x1 /* clean */
+#define UNIPHIER_SSCOPE_CM_FLUSH 0x2 /* flush */
+#define UNIPHIER_SSCOPE_CM_SYNC 0x8 /* sync (drain bufs) */
+#define UNIPHIER_SSCOPE_CM_FLUSH_PREFETCH 0x9 /* flush p-fetch buf */
+#define UNIPHIER_SSCOQM 0x248 /* Cache Operation Queue Mode */
+#define UNIPHIER_SSCOQM_TID_MASK (0x3 << 21)
+#define UNIPHIER_SSCOQM_TID_LRU_DATA (0x0 << 21)
+#define UNIPHIER_SSCOQM_TID_LRU_INST (0x1 << 21)
+#define UNIPHIER_SSCOQM_TID_WAY (0x2 << 21)
+#define UNIPHIER_SSCOQM_S_MASK (0x3 << 17)
+#define UNIPHIER_SSCOQM_S_RANGE (0x0 << 17)
+#define UNIPHIER_SSCOQM_S_ALL (0x1 << 17)
+#define UNIPHIER_SSCOQM_S_WAY (0x2 << 17)
+#define UNIPHIER_SSCOQM_CE BIT(15) /* notify completion */
+#define UNIPHIER_SSCOQM_CM_INV 0x0 /* invalidate */
+#define UNIPHIER_SSCOQM_CM_CLEAN 0x1 /* clean */
+#define UNIPHIER_SSCOQM_CM_FLUSH 0x2 /* flush */
+#define UNIPHIER_SSCOQM_CM_PREFETCH 0x3 /* prefetch to cache */
+#define UNIPHIER_SSCOQM_CM_PREFETCH_BUF 0x4 /* prefetch to pf-buf */
+#define UNIPHIER_SSCOQM_CM_TOUCH 0x5 /* touch */
+#define UNIPHIER_SSCOQM_CM_TOUCH_ZERO 0x6 /* touch to zero */
+#define UNIPHIER_SSCOQM_CM_TOUCH_DIRTY 0x7 /* touch with dirty */
+#define UNIPHIER_SSCOQAD 0x24c /* Cache Operation Queue Address */
+#define UNIPHIER_SSCOQSZ 0x250 /* Cache Operation Queue Size */
+#define UNIPHIER_SSCOQMASK 0x254 /* Cache Operation Queue Address Mask */
+#define UNIPHIER_SSCOQWN 0x258 /* Cache Operation Queue Way Number */
+#define UNIPHIER_SSCOPPQSEF 0x25c /* Cache Operation Queue Set Complete*/
+#define UNIPHIER_SSCOPPQSEF_FE BIT(1)
+#define UNIPHIER_SSCOPPQSEF_OE BIT(0)
+#define UNIPHIER_SSCOLPQS 0x260 /* Cache Operation Queue Status */
+#define UNIPHIER_SSCOLPQS_EF BIT(2)
+#define UNIPHIER_SSCOLPQS_EST BIT(1)
+#define UNIPHIER_SSCOLPQS_QST BIT(0)
+
+/* Is the touch/pre-fetch destination specified by ways? */
+#define UNIPHIER_SSCOQM_TID_IS_WAY(op) \
+ ((op & UNIPHIER_SSCOQM_TID_MASK) == UNIPHIER_SSCOQM_TID_WAY)
+/* Is the operation region specified by address range? */
+#define UNIPHIER_SSCOQM_S_IS_RANGE(op) \
+ ((op & UNIPHIER_SSCOQM_S_MASK) == UNIPHIER_SSCOQM_S_RANGE)
+/* Is the operation region specified by ways? */
+#define UNIPHIER_SSCOQM_S_IS_WAY(op) \
+ ((op & UNIPHIER_SSCOQM_S_MASK) == UNIPHIER_SSCOQM_S_WAY)
+
+#define UNIPHIER_L2_CACHE_LINE_SIZE 128
+#define UNIPHIER_L3_CACHE_LINE_SIZE 256
+
+/**
+ * uniphier_cache_data - UniPhier outer cache specific data
+ *
+ * @ctrl_base: virtual base address of control registers
+ * @rev_base: virtual base address of revision registers
+ * @op_base: virtual base address of operation registers
+ * @line_size: line size, which range operations must be aligned to
+ * @range_op_max_size: max data size for a single range operation can handle
+ */
+static struct uniphier_cache_data {
+ void __iomem *ctrl_base;
+ void __iomem *rev_base;
+ void __iomem *op_base;
+ unsigned int line_size;
+ unsigned long range_op_max_size;
+} uniphier_cache_data[];
+
+/* the number of detected outer cache levels (0: none, 1: L2, 2: L2&L3) */
+static int uniphier_outer_levels;
+
+/**
+ * __uniphier_cache_sync - perform a sync point for a particular cache level
+ *
+ * @data: cache controller specific data
+ */
+static void __uniphier_cache_sync(struct uniphier_cache_data *data)
+{
+ /* This sequence need not be atomic. Do not disable IRQ. */
+ writel_relaxed(UNIPHIER_SSCOPE_CM_SYNC,
+ data->op_base + UNIPHIER_SSCOPE);
+ /* need a read back to confirm */
+ readl_relaxed(data->op_base + UNIPHIER_SSCOPE);
+}
+
+/**
+ * __uniphier_cache_maint_common - run a queue operation for a particular level
+ *
+ * @data: cache controller specific data
+ * @start: start address of range operation (don't care for "all" operation)
+ * @size: data size of range operation (don't care for "all" operation)
+ * @operation: flags to specify the desired cache operation
+ */
+static void __uniphier_cache_maint_common(struct uniphier_cache_data *data,
+ unsigned long start,
+ unsigned long size,
+ u32 operation)
+{
+ unsigned long flags;
+
+ /*
+ * The IRQ must be disable during this sequence because the accessor
+ * holds the access right of the operation queue registers.
+ * Restore the IRQ after releasing the register access right.
+ */
+ local_irq_save(flags);
+
+ /* clear the complete notification flag */
+ writel_relaxed(UNIPHIER_SSCOLPQS_EF, data->op_base + UNIPHIER_SSCOLPQS);
+
+ /*
+ * We do not need a spin lock here because the hardware guarantees
+ * this sequence is atomic, i.e. the write access is arbitrated
+ * and only the winner's write accesses take effect.
+ * After register settings, we need to check the UNIPHIER_SSCOPPQSEF to
+ * see if we won the arbitration or not.
+ * If the command was not successfully set, just try again.
+ */
+ do {
+ /* set cache operation */
+ writel_relaxed(UNIPHIER_SSCOQM_CE | operation,
+ data->op_base + UNIPHIER_SSCOQM);
+
+ /* set address range if needed */
+ if (likely(UNIPHIER_SSCOQM_S_IS_RANGE(operation))) {
+ writel_relaxed(start, data->op_base + UNIPHIER_SSCOQAD);
+ writel_relaxed(size, data->op_base + UNIPHIER_SSCOQSZ);
+ }
+
+ /* set target ways if needed */
+ if (unlikely(UNIPHIER_SSCOQM_S_IS_WAY(operation) ||
+ UNIPHIER_SSCOQM_TID_IS_WAY(operation)))
+ /* set all the locked ways as destination */
+ writel_relaxed(~readl_relaxed(data->ctrl_base +
+ UNIPHIER_SSCLPDAWCR),
+ data->op_base + UNIPHIER_SSCOQWN);
+ } while (unlikely(readl_relaxed(data->op_base + UNIPHIER_SSCOPPQSEF) &
+ (UNIPHIER_SSCOPPQSEF_FE | UNIPHIER_SSCOPPQSEF_OE)));
+
+ /* wait until the operation is completed */
+ while (likely(readl_relaxed(data->op_base + UNIPHIER_SSCOLPQS) !=
+ UNIPHIER_SSCOLPQS_EF))
+ cpu_relax();
+
+ local_irq_restore(flags);
+}
+
+static void __uniphier_cache_maint_all(struct uniphier_cache_data *data,
+ u32 operation)
+{
+ __uniphier_cache_maint_common(data, 0, 0,
+ UNIPHIER_SSCOQM_S_ALL | operation);
+
+ __uniphier_cache_sync(data);
+}
+
+static void __uniphier_cache_maint_range(struct uniphier_cache_data *data,
+ unsigned long start, unsigned long end,
+ u32 operation)
+{
+ unsigned long size;
+
+ /*
+ * If the start address is not aligned,
+ * perform a cache operation for the first cache-line
+ */
+ start = start & ~(data->line_size - 1);
+
+ size = end - start;
+
+ if (unlikely(size >= (unsigned long)(-data->line_size))) {
+ /* this means cache operation for all range */
+ __uniphier_cache_maint_all(data, operation);
+ return;
+ }
+
+ /*
+ * If the end address is not aligned,
+ * perform a cache operation for the last cache-line
+ */
+ size = ALIGN(size, data->line_size);
+
+ while (size) {
+ u32 chunk_size = min(size, data->range_op_max_size);
+
+ __uniphier_cache_maint_common(data, start, chunk_size,
+ UNIPHIER_SSCOQM_S_RANGE | operation);
+
+ start += chunk_size;
+ size -= chunk_size;
+ }
+
+ __uniphier_cache_sync(data);
+}
+
+static void __uniphier_cache_enable(struct uniphier_cache_data *data, bool on)
+{
+ u32 val = 0;
+
+ if (on)
+ val = UNIPHIER_SSCC_WTG | UNIPHIER_SSCC_PRD | UNIPHIER_SSCC_ON;
+
+ writel_relaxed(val, data->ctrl_base + UNIPHIER_SSCC);
+}
+
+static void __uniphier_cache_set_active_ways(struct uniphier_cache_data *data,
+ u32 ways)
+{
+ writel_relaxed(ways, data->ctrl_base + UNIPHIER_SSCLPDAWCR);
+}
+
+static void uniphier_cache_maint_all(u32 operation)
+{
+ int i;
+
+ for (i = 0; i < uniphier_outer_levels; i++)
+ __uniphier_cache_maint_all(&uniphier_cache_data[i], operation);
+}
+
+static void uniphier_cache_maint_range(unsigned long start, unsigned long end,
+ u32 operation)
+{
+ int i;
+
+ for (i = 0; i < uniphier_outer_levels; i++)
+ __uniphier_cache_maint_range(&uniphier_cache_data[i],
+ start, end, operation);
+}
+
+static void uniphier_cache_inv_range(unsigned long start, unsigned long end)
+{
+ uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_INV);
+}
+
+static void uniphier_cache_clean_range(unsigned long start, unsigned long end)
+{
+ uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_CLEAN);
+}
+
+static void uniphier_cache_flush_range(unsigned long start, unsigned long end)
+{
+ uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_CM_FLUSH);
+}
+
+void __init uniphier_cache_touch_range(unsigned long start, unsigned long end)
+{
+ uniphier_cache_maint_range(start, end, UNIPHIER_SSCOQM_TID_WAY |
+ UNIPHIER_SSCOQM_CM_TOUCH);
+}
+
+static void __init uniphier_cache_inv_all(void)
+{
+ uniphier_cache_maint_all(UNIPHIER_SSCOQM_CM_INV);
+}
+
+static void uniphier_cache_flush_all(void)
+{
+ uniphier_cache_maint_all(UNIPHIER_SSCOQM_CM_FLUSH);
+}
+
+static void uniphier_cache_disable(void)
+{
+ int i;
+
+ for (i = uniphier_outer_levels - 1; i >= 0; i--)
+ __uniphier_cache_enable(&uniphier_cache_data[i], false);
+
+ uniphier_cache_flush_all();
+}
+
+static void __init uniphier_cache_enable(void)
+{
+ int i;
+
+ uniphier_cache_inv_all();
+
+ for (i = 0; i < uniphier_outer_levels; i++)
+ __uniphier_cache_enable(&uniphier_cache_data[i], true);
+}
+
+static void uniphier_cache_sync(void)
+{
+ int i;
+
+ for (i = 0; i < uniphier_outer_levels; i++)
+ __uniphier_cache_sync(&uniphier_cache_data[i]);
+}
+
+static void __init uniphier_cache_set_active_ways(u32 ways)
+{
+ int i;
+
+ for (i = 0; i < uniphier_outer_levels; i++)
+ __uniphier_cache_set_active_ways(&uniphier_cache_data[i],
+ ways);
+}
+
+static int __init uniphier_cache_common_init(struct device_node *np,
+ struct uniphier_cache_data *data)
+{
+ data->ctrl_base = of_iomap(np, 0);
+ if (!data->ctrl_base)
+ return -ENOMEM;
+
+ data->rev_base = of_iomap(np, 1);
+ if (!data->rev_base)
+ goto err;
+
+ data->op_base = of_iomap(np, 2);
+ if (!data->op_base)
+ goto err;
+
+ return 0;
+err:
+ iounmap(data->rev_base);
+ iounmap(data->ctrl_base);
+
+ return -ENOMEM;
+}
+
+static int __init uniphier_l2_cache_init(struct device_node *np,
+ struct uniphier_cache_data *data)
+{
+ int ret;
+ u32 revision;
+
+ ret = uniphier_cache_common_init(np, data);
+ if (ret)
+ return ret;
+
+ data->line_size = UNIPHIER_L2_CACHE_LINE_SIZE;
+
+ revision = readl(data->rev_base + UNIPHIER_SSCID);
+
+ if (revision >= 0x17) /* PH1-Pro5 or later */
+ data->range_op_max_size = (u32)-data->line_size;
+ else
+ data->range_op_max_size = (1UL << 22) - data->line_size;
+
+ writel_relaxed(0, data->ctrl_base + UNIPHIER_SSCC);
+
+ return 0;
+}
+
+static int __init uniphier_l3_cache_init(struct device_node *np,
+ struct uniphier_cache_data *data)
+{
+ int ret;
+
+ ret = uniphier_cache_common_init(np, data);
+ if (ret)
+ return ret;
+
+ data->line_size = UNIPHIER_L3_CACHE_LINE_SIZE;
+
+ data->range_op_max_size = (u32)-data->line_size;
+
+ return 0;
+}
+
+static const struct of_device_id uniphier_l2_cache_match[] __initconst = {
+ {
+ .compatible = "socionext,uniphier-l2-cache",
+ .data = uniphier_l2_cache_init,
+ },
+ { /* sentinel */ }
+};
+
+static const struct of_device_id uniphier_l3_cache_match[] __initconst = {
+ {
+ .compatible = "socionext,uniphier-l3-cache",
+ .data = uniphier_l3_cache_init,
+ },
+ { /* sentinel */ }
+};
+
+static const struct of_device_id *const uniphier_cache_matches[] __initconst = {
+ uniphier_l2_cache_match,
+ uniphier_l3_cache_match,
+};
+
+#define UNIPHIER_CACHE_LEVELS (ARRAY_SIZE(uniphier_cache_matches))
+
+static struct uniphier_cache_data uniphier_cache_data[UNIPHIER_CACHE_LEVELS];
+
+static int __init __uniphier_cache_init(void)
+{
+ int (*initf)(struct device_node *np, struct uniphier_cache_data *data);
+ static int done;
+ static int ret;
+ struct device_node *np;
+ const struct of_device_id *match;
+ int i;
+
+ if (done)
+ return ret;
+
+ for (i = 0; ARRAY_SIZE(uniphier_cache_matches); i++) {
+ np = of_find_matching_node_and_match(NULL,
+ uniphier_cache_matches[i],
+ &match);
+ if (!np) {
+ ret = -ENODEV;
+ break;
+ }
+
+ initf = match->data;
+ ret = initf(np, &uniphier_cache_data[i]);
+ if (ret)
+ break;
+ }
+
+ uniphier_outer_levels = i;
+
+ /*
+ * Error out iif L2 initialization fails.
+ * Continue with any error on L3 because it is optional.
+ */
+ if (uniphier_outer_levels == 0) {
+ ret = ret ?: -ENODEV;
+ pr_err("uniphier: failed to initialize outer cache\n");
+ goto out;
+ } else {
+ ret = 0;
+ }
+
+ outer_cache.inv_range = uniphier_cache_inv_range;
+ outer_cache.clean_range = uniphier_cache_clean_range;
+ outer_cache.flush_range = uniphier_cache_flush_range;
+ outer_cache.flush_all = uniphier_cache_flush_all;
+ outer_cache.disable = uniphier_cache_disable;
+ outer_cache.sync = uniphier_cache_sync;
+
+ uniphier_cache_enable();
+
+out:
+ done = 1;
+
+ return ret;
+}
+
+/**
+ * uniphier_cache_init - initialize outer cache and set all the ways active
+ *
+ * This enables the outer cache for the normal operation.
+ */
+int __init uniphier_cache_init(void)
+{
+ int ret;
+
+ ret = __uniphier_cache_init();
+ if (ret)
+ return ret;
+
+ uniphier_cache_set_active_ways(U32_MAX);
+
+ pr_info("uniphier: enabled outer cache (%s)\n",
+ uniphier_outer_levels >= 2 ? "L2 and L3" : "L2");
+
+ return 0;
+}
+
+/**
+ * uniphier_cache_init_locked - initialize outer cache and lock all the ways
+ *
+ * This enables the outer cache, but never performs the refill operations.
+ * If the data at the accessed address is found in the cache (cache-hit), the
+ * data is transferred to the CPU. If not (cache-miss), the desired data is
+ * fetched from the main memory, but the contents in the cache are _not_
+ * replaced. This is generally used to keep particular data in the cache.
+ */
+int __init uniphier_cache_init_locked(void)
+{
+ int ret;
+
+ ret = __uniphier_cache_init();
+ if (ret)
+ return ret;
+
+ uniphier_cache_set_active_ways(0);
+
+ pr_info("uniphier: set up outer cache (%s) as locked cache\n",
+ uniphier_outer_levels >= 2 ? "L2 and L3" : "L2");
+
+ return 0;
+}
--
1.9.1
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