mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 22:47:56 +00:00
121 lines
4.3 KiB
Diff
Executable File
121 lines
4.3 KiB
Diff
Executable File
From 911b448d4b528c403f973f9e5aa34be94bffaf1e Mon Sep 17 00:00:00 2001
|
|
From: Andy Green <andy@openmoko.com>
|
|
Date: Wed, 30 Jul 2008 14:37:01 +0100
|
|
Subject: [PATCH] add-glamo-mci-slower-clocking-dynamic-switching.patch
|
|
|
|
This patch gives glamo-mci a concept of a platform-defined
|
|
dynamic clock slowing callback. It means that platform code
|
|
can associate some completely external state to decide if
|
|
we run the SD clock at normal rate or a rate divided by a
|
|
module parameter "sd_slow_ratio", which you can set on
|
|
kernel commandline like this:
|
|
|
|
glamo_mci.sd_slow_ratio=8
|
|
|
|
you can also change it at runtime by
|
|
|
|
echo 8 > /sys/module/glamo_mci/parameters/sd_slow_ratio
|
|
|
|
If no platform callback is defined, then no slow mode
|
|
is used. If it is defined, then the default division
|
|
action is / 8, eg, 16MHz normal -> 2MHz slow mode.
|
|
|
|
Signed-off-by: Andy Green <andy@openmoko.com>
|
|
---
|
|
drivers/mfd/glamo/glamo-core.c | 2 ++
|
|
drivers/mfd/glamo/glamo-core.h | 2 ++
|
|
drivers/mfd/glamo/glamo-mci.c | 30 ++++++++++++++++++++++++++++--
|
|
include/linux/glamofb.h | 2 ++
|
|
4 files changed, 34 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c
|
|
index cb9b056..0e7a650 100644
|
|
--- a/drivers/mfd/glamo/glamo-core.c
|
|
+++ b/drivers/mfd/glamo/glamo-core.c
|
|
@@ -1116,6 +1116,8 @@ static int __init glamo_probe(struct platform_device *pdev)
|
|
/* bring MCI specific stuff over from our MFD platform data */
|
|
glamo_mci_def_pdata.glamo_set_mci_power =
|
|
glamo->pdata->glamo_set_mci_power;
|
|
+ glamo_mci_def_pdata.glamo_mci_use_slow =
|
|
+ glamo->pdata->glamo_mci_use_slow;
|
|
glamo_mci_def_pdata.glamo_irq_is_wired =
|
|
glamo->pdata->glamo_irq_is_wired;
|
|
glamo_mci_def_pdata.mci_suspending =
|
|
diff --git a/drivers/mfd/glamo/glamo-core.h b/drivers/mfd/glamo/glamo-core.h
|
|
index c89f810..dd6f67c 100644
|
|
--- a/drivers/mfd/glamo/glamo-core.h
|
|
+++ b/drivers/mfd/glamo/glamo-core.h
|
|
@@ -72,6 +72,8 @@ struct glamo_mci_pdata {
|
|
unsigned long ocr_avail;
|
|
void (*glamo_set_mci_power)(unsigned char power_mode,
|
|
unsigned short vdd);
|
|
+ /* glamo-mci asking if it should use the slow clock to card */
|
|
+ int (*glamo_mci_use_slow)(void);
|
|
int (*glamo_irq_is_wired)(void);
|
|
void (*mci_suspending)(struct platform_device *dev);
|
|
int (*mci_all_dependencies_resumed)(struct platform_device *dev);
|
|
diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
|
|
index 7a2b060..d34632a 100644
|
|
--- a/drivers/mfd/glamo/glamo-mci.c
|
|
+++ b/drivers/mfd/glamo/glamo-mci.c
|
|
@@ -57,6 +57,23 @@ static int sd_max_clk = 50000000 / 3;
|
|
module_param(sd_max_clk, int, 0644);
|
|
|
|
/*
|
|
+ * Slow SD clock rate
|
|
+ *
|
|
+ * you can override this on kernel commandline using
|
|
+ *
|
|
+ * glamo_mci.sd_slow_ratio=8
|
|
+ *
|
|
+ * for example
|
|
+ *
|
|
+ * platform callback is used to decide effective clock rate, if not
|
|
+ * defined then max is used, if defined and returns nonzero, rate is
|
|
+ * divided by this factor
|
|
+ */
|
|
+
|
|
+static int sd_slow_ratio = 8;
|
|
+module_param(sd_slow_ratio, int, 0644);
|
|
+
|
|
+/*
|
|
* SD Signal drive strength
|
|
*
|
|
* you can override this on kernel commandline using
|
|
@@ -554,8 +571,17 @@ static void glamo_mci_send_request(struct mmc_host *mmc)
|
|
cmd->opcode, cmd->arg, cmd->data, cmd->mrq->stop,
|
|
cmd->flags);
|
|
|
|
- /* resume requested clock rate */
|
|
- __glamo_mci_fix_card_div(host, host->clk_div);
|
|
+ /* resume requested clock rate
|
|
+ * scale it down by sd_slow_ratio if platform requests it
|
|
+ */
|
|
+ if (host->pdata->glamo_mci_use_slow)
|
|
+ if ((host->pdata->glamo_mci_use_slow)())
|
|
+ __glamo_mci_fix_card_div(host, host->clk_div *
|
|
+ sd_slow_ratio);
|
|
+ else
|
|
+ __glamo_mci_fix_card_div(host, host->clk_div);
|
|
+ else
|
|
+ __glamo_mci_fix_card_div(host, host->clk_div);
|
|
|
|
if (glamo_mci_send_command(host, cmd))
|
|
goto bail;
|
|
diff --git a/include/linux/glamofb.h b/include/linux/glamofb.h
|
|
index bb1a398..ca63355 100644
|
|
--- a/include/linux/glamofb.h
|
|
+++ b/include/linux/glamofb.h
|
|
@@ -31,6 +31,8 @@ struct glamofb_platform_data {
|
|
/* glamo mmc platform specific info */
|
|
void (*glamo_set_mci_power)(unsigned char power_mode,
|
|
unsigned short vdd);
|
|
+ /* glamo-mci asking if it should use the slow clock to card */
|
|
+ int (*glamo_mci_use_slow)(void);
|
|
int (*glamo_irq_is_wired)(void);
|
|
void (*mci_suspending)(struct platform_device *dev);
|
|
int (*mci_all_dependencies_resumed)(struct platform_device *dev);
|
|
--
|
|
1.5.6.3
|
|
|