From: dwalker@codeaurora•org (Daniel Walker)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC 04/18] arm: cache-l2x0: add l2x0 suspend and resume functions
Date: Mon, 11 Jan 2010 14:47:23 -0800 [thread overview]
Message-ID: <1263250057-26692-5-git-send-email-dwalker@codeaurora.org> (raw)
In-Reply-To: <1263250057-26692-1-git-send-email-dwalker@codeaurora.org>
From: Willie Ruan <wruan@quicinc•com>
Suspend function should be called before L2 cache power is turned off
to save power. Resume function should be called when the power is
reapplied.
Signed-off-by: Willie Ruan <wruan@quicinc•com>
Signed-off-by: Daniel Walker <dwalker@codeaurora•org>
---
arch/arm/include/asm/hardware/cache-l2x0.h | 3 ++
arch/arm/mm/cache-l2x0.c | 29 ++++++++++++++++++++++++++++
2 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/hardware/cache-l2x0.h b/arch/arm/include/asm/hardware/cache-l2x0.h
index cdb9022..a86b948 100644
--- a/arch/arm/include/asm/hardware/cache-l2x0.h
+++ b/arch/arm/include/asm/hardware/cache-l2x0.h
@@ -55,4 +55,7 @@
extern void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask);
#endif
+extern void l2x0_suspend(void);
+extern void l2x0_resume(int collapsed);
+
#endif
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index cb8fc65..05765f6 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -2,6 +2,7 @@
* arch/arm/mm/cache-l2x0.c - L210/L220 cache controller support
*
* Copyright (C) 2007 ARM Limited
+ * Copyright (c) 2009, Code Aurora Forum. All rights reserved.
*
* 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
@@ -26,6 +27,7 @@
#define CACHE_LINE_SIZE 32
static void __iomem *l2x0_base;
+static uint32_t aux_ctrl_save;
static DEFINE_SPINLOCK(l2x0_lock);
static inline void cache_wait(void __iomem *reg, unsigned long mask)
@@ -54,6 +56,13 @@ static inline void l2x0_inv_all(void)
spin_unlock_irqrestore(&l2x0_lock, flags);
}
+static inline void l2x0_flush_all(void)
+{
+ /* clean and invalidate all ways */
+ sync_writel(0xff, L2X0_CLEAN_INV_WAY, 0xff);
+ cache_sync();
+}
+
static void l2x0_inv_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
@@ -176,3 +185,23 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
printk(KERN_INFO "L2X0 cache controller enabled\n");
}
+
+void l2x0_suspend(void)
+{
+ /* Save aux control register value */
+ aux_ctrl_save = readl(l2x0_base + L2X0_AUX_CTRL);
+ /* Flush all cache */
+ l2x0_flush_all();
+ /* Disable the cache */
+ writel(0, l2x0_base + L2X0_CTRL);
+}
+
+void l2x0_resume(int collapsed)
+{
+ if (collapsed)
+ /* Restore aux control register value */
+ writel(aux_ctrl_save, l2x0_base + L2X0_AUX_CTRL);
+
+ /* Enable the cache */
+ writel(1, l2x0_base + L2X0_CTRL);
+}
--
1.6.3.3
next prev parent reply other threads:[~2010-01-11 22:47 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-11 22:47 [RFC 00/18] generic arm needed for msm Daniel Walker
2010-01-11 22:47 ` [RFC 01/18] arm: msm: allow ARCH_MSM to have v7 cpus Daniel Walker
2010-01-11 22:47 ` [RFC 02/18] arm: msm: add oprofile pmu support Daniel Walker
2010-01-11 22:47 ` [RFC 03/18] arm: boot: remove old ARM ID for QSD Daniel Walker
2010-01-15 21:26 ` Russell King - ARM Linux
2010-01-11 22:47 ` Daniel Walker [this message]
2010-01-11 23:44 ` [RFC 04/18] arm: cache-l2x0: add l2x0 suspend and resume functions Russell King - ARM Linux
2010-01-12 0:52 ` Ruan, Willie
2010-01-11 22:47 ` [RFC 05/18] arm: msm: implement ioremap_strongly_ordered Daniel Walker
2010-01-11 23:37 ` Russell King - ARM Linux
2010-01-28 23:04 ` Larry Bassel
2010-02-03 14:59 ` Russell King - ARM Linux
2010-01-11 22:47 ` [RFC 06/18] arm: msm: implement proper dmb() for 7x27 Daniel Walker
2010-01-11 23:39 ` Russell King - ARM Linux
2010-01-11 23:45 ` Daniel Walker
2010-01-12 0:01 ` Russell King - ARM Linux
2010-01-19 17:28 ` Jamie Lokier
2010-01-19 18:04 ` Russell King - ARM Linux
2010-01-19 21:12 ` Jamie Lokier
2010-01-19 23:11 ` Russell King - ARM Linux
2010-01-19 17:16 ` Jamie Lokier
2010-01-11 22:47 ` [RFC 07/18] arm: mm: retry on QSD icache parity errors Daniel Walker
2010-01-18 18:42 ` Ashwin Chaugule
2010-01-19 16:16 ` Ashwin Chaugule
2010-01-11 22:47 ` [RFC 08/18] arm: msm: set L2CR1 to enable prefetch and burst on Scorpion Daniel Walker
2010-01-11 23:45 ` Russell King - ARM Linux
2010-01-12 10:51 ` [RFC 08/18] arm: msm: set L2CR1 to enable prefetch and burston Scorpion Catalin Marinas
2010-01-12 11:23 ` Shilimkar, Santosh
2010-01-12 11:44 ` Russell King - ARM Linux
2010-01-12 13:32 ` [RFC 08/18] arm: msm: set L2CR1 to enable prefetch and burstonScorpion Catalin Marinas
2010-01-12 13:58 ` Russell King - ARM Linux
2010-01-12 14:41 ` [RFC 08/18] arm: msm: set L2CR1 to enable prefetch andburstonScorpion Catalin Marinas
2010-01-12 18:23 ` Daniel Walker
2010-01-13 10:36 ` Catalin Marinas
2010-01-19 17:38 ` Jamie Lokier
2010-01-13 6:14 ` [RFC 08/18] arm: msm: set L2CR1 to enable prefetch and burstonScorpion Shilimkar, Santosh
2010-01-12 20:21 ` [RFC 08/18] arm: msm: set L2CR1 to enable prefetch and burston Scorpion Nicolas Pitre
2010-01-11 22:47 ` [RFC 09/18] arm: mm: support error reporting in L1/L2 caches on QSD Daniel Walker
2010-01-11 22:47 ` [RFC 10/18] arm: mm: enable L2X0 to use L2 cache on MSM7X27 Daniel Walker
2010-01-11 22:47 ` [RFC 11/18] arm: msm: add ARCH_MSM_SCORPION to CPU_V7 Daniel Walker
2010-01-11 23:13 ` Russell King - ARM Linux
2010-01-11 23:17 ` Daniel Walker
2010-01-11 22:47 ` [RFC 12/18] arm: msm: Enable frequency scaling Daniel Walker
2010-01-11 22:47 ` [RFC 13/18] arm: msm: define HAVE_CLK for ARCH_MSM Daniel Walker
2010-01-11 22:47 ` [RFC 14/18] arm: msm: add v7 support for compiler version-4.1.1 Daniel Walker
2010-01-11 23:07 ` Russell King - ARM Linux
2010-01-11 22:47 ` [RFC 15/18] arm: vfp: Add additional vfp interfaces Daniel Walker
2010-01-11 22:47 ` [RFC 16/18] arm: msm: add arch_has_speculative_dfetch() Daniel Walker
2010-01-11 23:33 ` Russell King - ARM Linux
2010-01-12 0:28 ` Daniel Walker
2010-01-12 8:59 ` Russell King - ARM Linux
2010-01-11 22:47 ` [RFC 17/18] arm: mm: Add SW emulation for ARM domain manager feature Daniel Walker
2010-01-25 16:40 ` Catalin Marinas
2010-01-25 17:04 ` Nicolas Pitre
2010-01-25 18:25 ` Daniel Walker
2010-03-22 18:11 ` Daniel Walker
2010-03-22 18:58 ` Nicolas Pitre
2010-03-22 20:01 ` Daniel Walker
2010-03-22 20:32 ` Nicolas Pitre
2010-03-23 10:04 ` Catalin Marinas
2010-01-11 22:47 ` [RFC 18/18] arm: mm: qsd8x50: Fix incorrect permission faults Daniel Walker
2010-01-11 23:11 ` Russell King - ARM Linux
2010-01-19 17:10 ` Jamie Lokier
2010-01-19 17:33 ` Daniel Walker
2010-01-19 17:43 ` Jamie Lokier
2010-01-19 17:49 ` Daniel Walker
2010-01-19 18:09 ` Russell King - ARM Linux
2010-02-04 0:09 ` David Brown
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