[PATCH 15/24] C6X: cache control

Mark Salter
2011-08-22T20:11:08Z

Signed-off-by: Mark Salter <msalter@redhat.com>
---
arch/c6x/include/asm/cache.h | 90 ++++++++
arch/c6x/include/asm/cacheflush.h | 65 ++++++
arch/c6x/platforms/cache.c | 445 +++++++++++++++++++++++++++++++++++++
3 files changed, 600 insertions(+), 0 deletions(-)
create mode 100644 arch/c6x/include/asm/cache.h
create mode 100644 arch/c6x/include/asm/cacheflush.h
create mode 100644 arch/c6x/platforms/cache.c

diff --git a/arch/c6x/include/asm/cache.h b/arch/c6x/include/asm/cache.h
new file mode 100644
index 0000000..6d521d9
--- /dev/null
+++ b/arch/c6x/include/asm/cache.h
@@ -0,0 +1,90 @@
+/*
+ * Port on Texas Instruments TMS320C6x architecture
+ *
+ * Copyright (C) 2005, 2006, 2009, 2010 Texas Instruments Incorporated
+ * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _ASM_C6X_CACHE_H
+#define _ASM_C6X_CACHE_H
+
+#include <linux/irqflags.h>
+
+/*
+ * Cache line size
+ */
+#define L1D_CACHE_BYTES 64
+#define L1P_CACHE_BYTES 32
+#define L2_CACHE_BYTES 128
+
+/*
+ * L2 used as cache
+ */
+#define L2MODE_SIZE L2MODE_256K_CACHE
+
+/*
+ * For practical reasons the L1_CACHE_BYTES defines should not be smaller than
+ * the L2 line size
+ */
+#define L1_CACHE_BYTES L2_CACHE_BYTES
+
+#define L2_CACHE_ALIGN_LOW(x) \
+ (((x) & ~(L2_CACHE_BYTES - 1)))
+#define L2_CACHE_ALIGN_UP(x) \
+ (((x) + (L2_CACHE_BYTES - 1)) & ~(L2_CACHE_BYTES - 1))
+#define L2_CACHE_ALIGN_CNT(x) \
+ (((x) + (sizeof(int) - 1)) & ~(sizeof(int) - 1))
+
+#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
+#define ARCH_SLAB_MINALIGN L1_CACHE_BYTES
+
+/*
+ * This is the granularity of hardware cacheability control.
+ */
+#define CACHEABILITY_ALIGN 0x01000000
+
+/*
+ * Align a physical address to MAR regions
+ */
+#define CACHE_REGION_START(v) \
+ (((u32) (v)) & ~(CACHEABILITY_ALIGN - 1))
+#define CACHE_REGION_END(v) \
+ (((u32) (v) + (CACHEABILITY_ALIGN - 1)) & ~(CACHEABILITY_ALIGN - 1))
+
+extern void __init c6x_cache_init(void);
+
+extern void enable_caching(unsigned long start, unsigned long end);
+extern void disable_caching(unsigned long start, unsigned long end);
+
+extern void L1_cache_off(void);
+extern void L1_cache_on(void);
+
+extern void L1P_cache_global_invalidate(void);
+extern void L1D_cache_global_invalidate(void);
+extern void L1D_cache_global_writeback(void);
+extern void L1D_cache_global_writeback_invalidate(void);
+extern void L2_cache_set_mode(unsigned int mode);
+extern void L2_cache_global_writeback_invalidate(void);
+extern void L2_cache_global_writeback(void);
+
+extern void L1P_cache_block_invalidate(unsigned int start, unsigned int end);
+extern void L1D_cache_block_invalidate(unsigned int start, unsigned int end);
+extern void L1D_cache_block_writeback_invalidate(unsigned int start,
+ unsigned int end);
+extern void L1D_cache_block_writeback(unsigned int start, unsigned int end);
+extern void L2_cache_block_invalidate(unsigned int start, unsigned int end);
+extern void L2_cache_block_writeback(unsigned int start, unsigned int end);
+extern void L2_cache_block_writeback_invalidate(unsigned int start,
+ unsigned int end);
+extern void L2_cache_block_invalidate_nowait(unsigned int start,
+ unsigned int end);
+extern void L2_cache_block_writeback_nowait(unsigned int start,
+ unsigned int end);
+
+extern void L2_cache_block_writeback_invalidate_nowait(unsigned int start,
+ unsigned int end);
+
+#endif /* _ASM_C6X_CACHE_H */
diff --git a/arch/c6x/include/asm/cacheflush.h b/arch/c6x/include/asm/cacheflush.h
new file mode 100644
index 0000000..df5db90
--- /dev/null
+++ b/arch/c6x/include/asm/cacheflush.h
@@ -0,0 +1,65 @@
+/*
+ * Port on Texas Instruments TMS320C6x architecture
+ *
+ * Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
+ * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _ASM_C6X_CACHEFLUSH_H
+#define _ASM_C6X_CACHEFLUSH_H
+
+#include <linux/spinlock.h>
+
+#include <asm/setup.h>
+#include <asm/cache.h>
+#include <asm/mman.h>
+#include <asm/page.h>
+#include <asm/string.h>
+
+/*
+ * virtually-indexed cache management (our cache is physically indexed)
+ */
+#define flush_cache_all() do {} while (0)
+#define flush_cache_mm(mm) do {} while (0)
+#define flush_cache_dup_mm(mm) do {} while (0)
+#define flush_cache_range(mm, start, end) do {} while (0)
+#define flush_cache_page(vma, vmaddr, pfn) do {} while (0)
+#define flush_cache_vmap(start, end) do {} while (0)
+#define flush_cache_vunmap(start, end) do {} while (0)
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
+#define flush_dcache_page(page) do {} while (0)
+#define flush_dcache_mmap_lock(mapping) do {} while (0)
+#define flush_dcache_mmap_unlock(mapping) do {} while (0)
+
+/*
+ * physically-indexed cache management
+ */
+#define flush_icache_range(s, e) \
+do { \
+ L1D_cache_block_writeback((s), (e)); \
+ L1P_cache_block_invalidate((s), (e)); \
+} while (0)
+
+#define flush_icache_page(vma, page) \
+do { \
+ if ((vma)->vm_flags & PROT_EXEC) \
+ L1D_cache_block_writeback_invalidate(page_address(page), \
+ (unsigned long) page_address(page) + PAGE_SIZE)); \
+ L1P_cache_block_invalidate(page_address(page), \
+ (unsigned long) page_address(page) + PAGE_SIZE)); \
+} while (0)
+
+
+#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
+do { \
+ memcpy(dst, src, len); \
+ flush_icache_range((unsigned) (dst), (unsigned) (dst) + (len)); \
+} while (0)
+
+#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
+ memcpy(dst, src, len)
+
+#endif /* _ASM_C6X_CACHEFLUSH_H */
diff --git a/arch/c6x/platforms/cache.c b/arch/c6x/platforms/cache.c
new file mode 100644
index 0000000..86318a1
--- /dev/null
+++ b/arch/c6x/platforms/cache.c
@@ -0,0 +1,445 @@
+/*
+ * Copyright (C) 2011 Texas Instruments Incorporated
+ * Author: Mark Salter <msalter@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+
+#include <asm/cache.h>
+#include <asm/soc.h>
+
+/*
+ * Internal Memory Control Registers for caches
+ */
+#define IMCR_CCFG 0x0000
+#define IMCR_L1PCFG 0x0020
+#define IMCR_L1PCC 0x0024
+#define IMCR_L1DCFG 0x0040
+#define IMCR_L1DCC 0x0044
+#define IMCR_L2ALLOC0 0x2000
+#define IMCR_L2ALLOC1 0x2004
+#define IMCR_L2ALLOC2 0x2008
+#define IMCR_L2ALLOC3 0x200c
+#define IMCR_L2WBAR 0x4000
+#define IMCR_L2WWC 0x4004
+#define IMCR_L2WIBAR 0x4010
+#define IMCR_L2WIWC 0x4014
+#define IMCR_L2IBAR 0x4018
+#define IMCR_L2IWC 0x401c
+#define IMCR_L1PIBAR 0x4020
+#define IMCR_L1PIWC 0x4024
+#define IMCR_L1DWIBAR 0x4030
+#define IMCR_L1DWIWC 0x4034
+#define IMCR_L1DWBAR 0x4040
+#define IMCR_L1DWWC 0x4044
+#define IMCR_L1DIBAR 0x4048
+#define IMCR_L1DIWC 0x404c
+#define IMCR_L2WB 0x5000
+#define IMCR_L2WBINV 0x5004
+#define IMCR_L2INV 0x5008
+#define IMCR_L1PINV 0x5028
+#define IMCR_L1DWB 0x5040
+#define IMCR_L1DWBINV 0x5044
+#define IMCR_L1DINV 0x5048
+#define IMCR_MAR_BASE 0x8000
+#define IMCR_MAR96_111 0x8180
+#define IMCR_MAR128_191 0x8200
+#define IMCR_MAR224_239 0x8380
+#define IMCR_L2MPFAR 0xa000
+#define IMCR_L2MPFSR 0xa004
+#define IMCR_L2MPFCR 0xa008
+#define IMCR_L2MPLK0 0xa100
+#define IMCR_L2MPLK1 0xa104
+#define IMCR_L2MPLK2 0xa108
+#define IMCR_L2MPLK3 0xa10c
+#define IMCR_L2MPLKCMD 0xa110
+#define IMCR_L2MPLKSTAT 0xa114
+#define IMCR_L2MPPA_BASE 0xa200
+#define IMCR_L1PMPFAR 0xa400
+#define IMCR_L1PMPFSR 0xa404
+#define IMCR_L1PMPFCR 0xa408
+#define IMCR_L1PMPLK0 0xa500
+#define IMCR_L1PMPLK1 0xa504
+#define IMCR_L1PMPLK2 0xa508
+#define IMCR_L1PMPLK3 0xa50c
+#define IMCR_L1PMPLKCMD 0xa510
+#define IMCR_L1PMPLKSTAT 0xa514
+#define IMCR_L1PMPPA_BASE 0xa600
+#define IMCR_L1DMPFAR 0xac00
+#define IMCR_L1DMPFSR 0xac04
+#define IMCR_L1DMPFCR 0xac08
+#define IMCR_L1DMPLK0 0xad00
+#define IMCR_L1DMPLK1 0xad04
+#define IMCR_L1DMPLK2 0xad08
+#define IMCR_L1DMPLK3 0xad0c
+#define IMCR_L1DMPLKCMD 0xad10
+#define IMCR_L1DMPLKSTAT 0xad14
+#define IMCR_L1DMPPA_BASE 0xae00
+#define IMCR_L2PDWAKE0 0xc040
+#define IMCR_L2PDWAKE1 0xc044
+#define IMCR_L2PDSLEEP0 0xc050
+#define IMCR_L2PDSLEEP1 0xc054
+#define IMCR_L2PDSTAT0 0xc060
+#define IMCR_L2PDSTAT1 0xc064
+
+/*
+ * CCFG register values and bits
+ */
+#define L2MODE_0K_CACHE 0x0
+#define L2MODE_32K_CACHE 0x1
+#define L2MODE_64K_CACHE 0x2
+#define L2MODE_128K_CACHE 0x3
+#define L2MODE_256K_CACHE 0x7
+
+#define L2PRIO_URGENT 0x0
+#define L2PRIO_HIGH 0x1
+#define L2PRIO_MEDIUM 0x2
+#define L2PRIO_LOW 0x3
+
+#define CCFG_ID 0x100 /* Invalidate L1P bit */
+#define CCFG_IP 0x200 /* Invalidate L1D bit */
+
+static void __iomem *cache_base;
+
+/*
+ * L1 & L2 caches generic functions
+ */
+#define imcr_get(reg) soc_readl(cache_base + (reg))
+#define imcr_set(reg, value) \
+do { \
+ soc_writel((value), cache_base + (reg)); \
+ soc_readl(cache_base + (reg)); \
+} while (0)
+
+static void cache_block_operation_wait(unsigned int wc_reg)
+{
+ /* Wait for completion */
+ while (imcr_get(wc_reg))
+ cpu_relax();
+}
+
+static DEFINE_SPINLOCK(cache_lock);
+
+/*
+ * Generic function to perform a block cache operation as
+ * invalidate or writeback/invalidate
+ */
+static void cache_block_operation(unsigned int *start,
+ unsigned int *end,
+ unsigned int bar_reg,
+ unsigned int wc_reg)
+{
+ unsigned long flags;
+ unsigned int wcnt =
+ (L2_CACHE_ALIGN_CNT((unsigned int) end)
+ - L2_CACHE_ALIGN_LOW((unsigned int) start)) >> 2;
+ unsigned int wc = 0;
+
+ for (; wcnt; wcnt -= wc, start += wc) {
+loop:
+ spin_lock_irqsave(&cache_lock, flags);
+
+ /*
+ * If another cache operation is occuring
+ */
+ if (unlikely(imcr_get(wc_reg))) {
+ spin_unlock_irqrestore(&cache_lock, flags);
+
+ /* Wait for previous operation completion */
+ cache_block_operation_wait(wc_reg);
+
+ /* Try again */
+ goto loop;
+ }
+
+ imcr_set(bar_reg, L2_CACHE_ALIGN_LOW((unsigned int) start));
+
+ if (wcnt > 0xffff)
+ wc = 0xffff;
+ else
+ wc = wcnt;
+
+ /* Set word count value in the WC register */
+ imcr_set(wc_reg, wc & 0xffff);
+
+ spin_unlock_irqrestore(&cache_lock, flags);
+
+ /* Wait for completion */
+ cache_block_operation_wait(wc_reg);
+ }
+}
+
+static void cache_block_operation_nowait(unsigned int *start,
+ unsigned int *end,
+ unsigned int bar_reg,
+ unsigned int wc_reg)
+{
+ unsigned long flags;
+ unsigned int wcnt =
+ (L2_CACHE_ALIGN_CNT((unsigned int) end)
+ - L2_CACHE_ALIGN_LOW((unsigned int) start)) >> 2;
+ unsigned int wc = 0;
+
+ for (; wcnt; wcnt -= wc, start += wc) {
+
+ spin_lock_irqsave(&cache_lock, flags);
+
+ imcr_set(bar_reg, L2_CACHE_ALIGN_LOW((unsigned int) start));
+
+ if (wcnt > 0xffff)
+ wc = 0xffff;
+ else
+ wc = wcnt;
+
+ /* Set word count value in the WC register */
+ imcr_set(wc_reg, wc & 0xffff);
+
+ spin_unlock_irqrestore(&cache_lock, flags);
+
+ /* Don't wait for completion on last cache operation */
+ if (wcnt > 0xffff)
+ cache_block_operation_wait(wc_reg);
+ }
+}
+
+/*
+ * L1 caches management
+ */
+
+/*
+ * Disable L1 caches
+ */
+void L1_cache_off(void)
+{
+ unsigned int dummy;
+
+ imcr_set(IMCR_L1PCFG, 0);
+ dummy = imcr_get(IMCR_L1PCFG);
+
+ imcr_set(IMCR_L1DCFG, 0);
+ dummy = imcr_get(IMCR_L1DCFG);
+}
+
+/*
+ * Enable L1 caches
+ */
+void L1_cache_on(void)
+{
+ unsigned int dummy;
+
+ imcr_set(IMCR_L1PCFG, 7);
+ dummy = imcr_get(IMCR_L1PCFG);
+
+ imcr_set(IMCR_L1DCFG, 7);
+ dummy = imcr_get(IMCR_L1DCFG);
+}
+
+/*
+ * L1P global-invalidate all
+ */
+void L1P_cache_global_invalidate(void)
+{
+ unsigned int set = 1;
+ imcr_set(IMCR_L1PINV, set);
+ while (imcr_get(IMCR_L1PINV) & 1)
+ cpu_relax();
+}
+
+/*
+ * L1D global-invalidate all
+ *
+ * Warning: this operation causes all updated data in L1D to
+ * be discarded rather than written back to the lower levels of
+ * memory
+ */
+void L1D_cache_global_invalidate(void)
+{
+ unsigned int set = 1;
+ imcr_set(IMCR_L1DINV, set);
+ while (imcr_get(IMCR_L1DINV) & 1)
+ cpu_relax();
+}
+
+void L1D_cache_global_writeback(void)
+{
+ unsigned int set = 1;
+ imcr_set(IMCR_L1DWB, set);
+ while (imcr_get(IMCR_L1DWB) & 1)
+ cpu_relax();
+}
+
+void L1D_cache_global_writeback_invalidate(void)
+{
+ unsigned int set = 1;
+ imcr_set(IMCR_L1DWBINV, set);
+ while (imcr_get(IMCR_L1DWBINV) & 1)
+ cpu_relax();
+}
+
+/*
+ * L2 caches management
+ */
+
+/*
+ * Set L2 operation mode
+ */
+void L2_cache_set_mode(unsigned int mode)
+{
+ unsigned int ccfg = imcr_get(IMCR_CCFG);
+
+ /* Clear and set the L2MODE bits in CCFG */
+ ccfg &= ~7;
+ ccfg |= (mode & 7);
+ imcr_set(IMCR_CCFG, ccfg);
+ ccfg = imcr_get(IMCR_CCFG);
+}
+
+/*
+ * L2 global-writeback and global-invalidate all
+ */
+void L2_cache_global_writeback_invalidate(void)
+{
+ imcr_set(IMCR_L2WBINV, 1);
+ while (imcr_get(IMCR_L2WBINV))
+ cpu_relax();
+}
+
+/*
+ * L2 global-writeback all
+ */
+void L2_cache_global_writeback(void)
+{
+ imcr_set(IMCR_L2WB, 1);
+ while (imcr_get(IMCR_L2WB))
+ cpu_relax();
+}
+
+/*
+ * Cacheability controls
+ */
+void enable_caching(unsigned long start, unsigned long end)
+{
+ unsigned int mar = IMCR_MAR_BASE + ((start >> 24) << 2);
+ unsigned int mar_e = IMCR_MAR_BASE + ((end >> 24) << 2);
+
+ for (; mar <= mar_e; mar += 4)
+ imcr_set(mar, imcr_get(mar) | 1);
+}
+
+void disable_caching(unsigned long start, unsigned long end)
+{
+ unsigned int mar = IMCR_MAR_BASE + ((start >> 24) << 2);
+ unsigned int mar_e = IMCR_MAR_BASE + ((end >> 24) << 2);
+
+ for (; mar <= mar_e; mar += 4)
+ imcr_set(mar, imcr_get(mar) & ~1);
+}
+
+
+/*
+ * L1 block operations
+ */
+void L1P_cache_block_invalidate(unsigned int start, unsigned int end)
+{
+ cache_block_operation((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L1PIBAR, IMCR_L1PIWC);
+}
+
+void L1D_cache_block_invalidate(unsigned int start, unsigned int end)
+{
+ cache_block_operation((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L1DIBAR, IMCR_L1DIWC);
+}
+
+void L1D_cache_block_writeback_invalidate(unsigned int start, unsigned int end)
+{
+ cache_block_operation((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L1DWIBAR, IMCR_L1DWIWC);
+}
+
+void L1D_cache_block_writeback(unsigned int start, unsigned int end)
+{
+ cache_block_operation((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L1DWBAR, IMCR_L1DWWC);
+}
+
+/*
+ * L2 block operations
+ */
+void L2_cache_block_invalidate(unsigned int start, unsigned int end)
+{
+ cache_block_operation((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L2IBAR, IMCR_L2IWC);
+}
+
+void L2_cache_block_writeback(unsigned int start, unsigned int end)
+{
+ cache_block_operation((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L2WBAR, IMCR_L2WWC);
+}
+
+void L2_cache_block_writeback_invalidate(unsigned int start, unsigned int end)
+{
+ cache_block_operation((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L2WIBAR, IMCR_L2WIWC);
+}
+
+void L2_cache_block_invalidate_nowait(unsigned int start, unsigned int end)
+{
+ cache_block_operation_nowait((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L2IBAR, IMCR_L2IWC);
+}
+
+void L2_cache_block_writeback_nowait(unsigned int start, unsigned int end)
+{
+ cache_block_operation_nowait((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L2WBAR, IMCR_L2WWC);
+}
+
+void L2_cache_block_writeback_invalidate_nowait(unsigned int start,
+ unsigned int end)
+{
+ cache_block_operation_nowait((unsigned int *) start,
+ (unsigned int *) end,
+ IMCR_L2WIBAR, IMCR_L2WIWC);
+}
+
+
+/*
+ * L1 and L2 caches configuration
+ */
+void __init c6x_cache_init(void)
+{
+ struct device_node *node;
+
+ node = of_find_compatible_node(NULL, NULL, "ti,c64x+cache");
+ if (!node)
+ return;
+
+ cache_base = of_iomap(node, 0);
+
+ of_node_put(node);
+
+ if (!cache_base)
+ return;
+
+ /* Set L2 caches on the the whole L2 SRAM memory */
+ L2_cache_set_mode(L2MODE_SIZE);
+
+ /* Enable L1 */
+ L1_cache_on();
+}
--
1.7.6