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From d7cfa1cb5602a1d936df36ee70869753835de28e Mon Sep 17 00:00:00 2001
From: Weijie Gao <weijie.gao@mediatek.com>
Date: Fri, 20 May 2022 11:21:51 +0800
Subject: [PATCH 04/25] mips: add support for noncached_alloc()
This patch adds support for noncached_alloc() which was only supported by
ARM platform.
Unlike the ARM platform, MMU is not used in u-boot for MIPS. Instead, KSEG
is provided to access uncached memory. So most code of this patch is copied
from cache.c of ARM platform, with only two differences:
1. MMU is untouched in noncached_set_region()
2. Address returned by noncached_alloc() is converted using KSEG1ADDR()
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
---
arch/mips/include/asm/system.h | 20 ++++++++++++++++
arch/mips/lib/cache.c | 43 ++++++++++++++++++++++++++++++++++
2 files changed, 63 insertions(+)
diff --git a/arch/mips/include/asm/system.h b/arch/mips/include/asm/system.h
index 79e638844b..89a2ac209f 100644
--- a/arch/mips/include/asm/system.h
+++ b/arch/mips/include/asm/system.h
@@ -282,4 +282,24 @@ static inline void instruction_hazard_barrier(void)
: "=&r"(tmp));
}
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+/* 1MB granularity */
+#define MMU_SECTION_SHIFT 20
+#define MMU_SECTION_SIZE (1 << MMU_SECTION_SHIFT)
+
+/**
+ * noncached_init() - Initialize non-cached memory region
+ *
+ * Initialize non-cached memory area. This memory region will be typically
+ * located right below the malloc() area and be accessed from KSEG1.
+ *
+ * It is called during the generic post-relocation init sequence.
+ *
+ * Return: 0 if OK
+ */
+int noncached_init(void);
+
+phys_addr_t noncached_alloc(size_t size, size_t align);
+#endif /* CONFIG_SYS_NONCACHED_MEMORY */
+
#endif /* _ASM_SYSTEM_H */
diff --git a/arch/mips/lib/cache.c b/arch/mips/lib/cache.c
index ec652f0fba..d23b38d6b9 100644
--- a/arch/mips/lib/cache.c
+++ b/arch/mips/lib/cache.c
@@ -6,6 +6,7 @@
#include <common.h>
#include <cpu_func.h>
+#include <malloc.h>
#include <asm/cache.h>
#include <asm/cacheops.h>
#include <asm/cm.h>
@@ -197,3 +198,45 @@ void dcache_disable(void)
/* ensure the pipeline doesn't contain now-invalid instructions */
instruction_hazard_barrier();
}
+
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+static unsigned long noncached_start;
+static unsigned long noncached_end;
+static unsigned long noncached_next;
+
+void noncached_set_region(void)
+{
+}
+
+int noncached_init(void)
+{
+ phys_addr_t start, end;
+ size_t size;
+
+ /* If this calculation changes, update board_f.c:reserve_noncached() */
+ end = ALIGN(mem_malloc_start, MMU_SECTION_SIZE) - MMU_SECTION_SIZE;
+ size = ALIGN(CONFIG_SYS_NONCACHED_MEMORY, MMU_SECTION_SIZE);
+ start = end - size;
+
+ debug("mapping memory %pa-%pa non-cached\n", &start, &end);
+
+ noncached_start = start;
+ noncached_end = end;
+ noncached_next = start;
+
+ return 0;
+}
+
+phys_addr_t noncached_alloc(size_t size, size_t align)
+{
+ phys_addr_t next = ALIGN(noncached_next, align);
+
+ if (next >= noncached_end || (noncached_end - next) < size)
+ return 0;
+
+ debug("allocated %zu bytes of uncached memory @%pa\n", size, &next);
+ noncached_next = next + size;
+
+ return CKSEG1ADDR(next);
+}
+#endif /* CONFIG_SYS_NONCACHED_MEMORY */
--
2.36.1
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