mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 22:47:56 +00:00
168 lines
4.9 KiB
Diff
Executable File
168 lines
4.9 KiB
Diff
Executable File
From e1bc0be9f95559ae154d24b353e404c781798da1 Mon Sep 17 00:00:00 2001
|
|
From: Andy Green <andy@openmoko.com>
|
|
Date: Fri, 25 Jul 2008 23:06:20 +0100
|
|
Subject: [PATCH] debug-add-glamo-drive-strength-module-param.patch
|
|
Suggested-by: Werner Almesberger <werner@openmoko.org>
|
|
|
|
This patch allows users to control two additional settings
|
|
in Glamo MCI driver from kernel commandline or module
|
|
parameters.
|
|
|
|
|
|
First is Glamo drive strength on SD IOs including CLK.
|
|
This ranges from 0 (weakest) to 3 (strongest).
|
|
|
|
echo 0 > /sys/module/glamo_mci/parameters/sd_drive
|
|
|
|
(Changes to this take effect on next SD Card transaction)
|
|
|
|
or, from kernel commandline
|
|
|
|
glamo_mci.sd_drive=0
|
|
|
|
On tests here with 0 strength, communication to SD card
|
|
(shipped 512MB Sandisk) seemed fine, and a dd of 10MB
|
|
urandom had the same md5 when written to cache as after
|
|
a reboot. I set the default to 2.
|
|
|
|
|
|
Second is whether we allow SD_CLK when the SD interface
|
|
is idle.
|
|
|
|
# stop the clock when we are idle (default)
|
|
echo 0 > /sys/module/glamo_mci/parameters/sd_idleclk
|
|
|
|
# run the SD clock all the time
|
|
echo 1 > /sys/module/glamo_mci/parameters/sd_idleclk
|
|
|
|
(changes take effect on next SD Card transaction)
|
|
|
|
From kernel commandline, eg:
|
|
|
|
glamo_mci.sd_idleclk=1
|
|
|
|
Normally you don't want to run the SD Clock all the time.
|
|
|
|
|
|
Signed-off-by: Andy Green <andy@openmoko.com>
|
|
---
|
|
drivers/mfd/glamo/glamo-mci.c | 59 +++++++++++++++++++++++++++++++---------
|
|
1 files changed, 45 insertions(+), 14 deletions(-)
|
|
|
|
diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
|
|
index 93f4074..4615033 100644
|
|
--- a/drivers/mfd/glamo/glamo-mci.c
|
|
+++ b/drivers/mfd/glamo/glamo-mci.c
|
|
@@ -56,6 +56,32 @@ static void glamo_mci_send_request(struct mmc_host *mmc);
|
|
static int sd_max_clk = 50000000 / 3;
|
|
module_param(sd_max_clk, int, 0644);
|
|
|
|
+/*
|
|
+ * SD Signal drive strength
|
|
+ *
|
|
+ * you can override this on kernel commandline using
|
|
+ *
|
|
+ * glamo_mci.sd_drive=0
|
|
+ *
|
|
+ * for example
|
|
+ */
|
|
+
|
|
+static int sd_drive = 2;
|
|
+module_param(sd_drive, int, 0644);
|
|
+
|
|
+/*
|
|
+ * SD allow SD clock to run while idle
|
|
+ *
|
|
+ * you can override this on kernel commandline using
|
|
+ *
|
|
+ * glamo_mci.sd_idleclk=0
|
|
+ *
|
|
+ * for example
|
|
+ */
|
|
+
|
|
+static int sd_idleclk = 0; /* disallow idle clock by default */
|
|
+module_param(sd_idleclk, int, 0644);
|
|
+
|
|
|
|
|
|
unsigned char CRC7(u8 * pu8, int cnt)
|
|
@@ -239,7 +265,9 @@ static int __glamo_mci_set_card_clock(struct glamo_mci_host *host, int freq,
|
|
if (division)
|
|
*division = 0xff;
|
|
|
|
- __glamo_mci_fix_card_div(host, -1); /* clock off */
|
|
+ if (!sd_idleclk)
|
|
+ /* clock off */
|
|
+ __glamo_mci_fix_card_div(host, -1);
|
|
}
|
|
|
|
return real_rate;
|
|
@@ -294,8 +322,9 @@ static void glamo_mci_irq(unsigned int irq, struct irq_desc *desc)
|
|
host->cmd_is_stop = 0;
|
|
}
|
|
|
|
- /* clock off */
|
|
- __glamo_mci_fix_card_div(host, -1);
|
|
+ if (!sd_idleclk)
|
|
+ /* clock off */
|
|
+ __glamo_mci_fix_card_div(host, -1);
|
|
|
|
done:
|
|
host->complete_what = COMPLETION_NONE;
|
|
@@ -428,12 +457,10 @@ static int glamo_mci_send_command(struct glamo_mci_host *host,
|
|
} else
|
|
writew(0xfff, host->base + GLAMO_REG_MMC_TIMEOUT);
|
|
|
|
- /* Generate interrupt on txfer; drive strength max */
|
|
- writew_dly((readw_dly(host->base + GLAMO_REG_MMC_BASIC) & 0xfe) |
|
|
+ /* Generate interrupt on txfer */
|
|
+ writew_dly((readw_dly(host->base + GLAMO_REG_MMC_BASIC) & 0x3e) |
|
|
0x0800 | GLAMO_BASIC_MMC_NO_CLK_RD_WAIT |
|
|
- GLAMO_BASIC_MMC_EN_COMPL_INT |
|
|
- GLAMO_BASIC_MMC_EN_DR_STR0 |
|
|
- GLAMO_BASIC_MMC_EN_DR_STR1,
|
|
+ GLAMO_BASIC_MMC_EN_COMPL_INT | (sd_drive << 6),
|
|
host->base + GLAMO_REG_MMC_BASIC);
|
|
|
|
/* send the command out on the wire */
|
|
@@ -620,8 +647,9 @@ done:
|
|
host->mrq = NULL;
|
|
mmc_request_done(host->mmc, cmd->mrq);
|
|
bail:
|
|
- /* stop the clock to card */
|
|
- __glamo_mci_fix_card_div(host, -1);
|
|
+ if (!sd_idleclk)
|
|
+ /* stop the clock to card */
|
|
+ __glamo_mci_fix_card_div(host, -1);
|
|
}
|
|
|
|
static void glamo_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
@@ -687,8 +715,9 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
host->real_rate = __glamo_mci_set_card_clock(host, ios->clock, &div);
|
|
host->clk_div = div;
|
|
|
|
- /* stop the clock to card, because we are idle until transfer */
|
|
- __glamo_mci_fix_card_div(host, -1);
|
|
+ if (!sd_idleclk)
|
|
+ /* stop the clock to card, because we are idle until transfer */
|
|
+ __glamo_mci_fix_card_div(host, -1);
|
|
|
|
if ((ios->power_mode == MMC_POWER_ON) ||
|
|
(ios->power_mode == MMC_POWER_UP)) {
|
|
@@ -705,8 +734,10 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
if (host->bus_width == MMC_BUS_WIDTH_4)
|
|
n = GLAMO_BASIC_MMC_EN_4BIT_DATA;
|
|
writew_dly((readw_dly(host->base + GLAMO_REG_MMC_BASIC) &
|
|
- (~GLAMO_BASIC_MMC_EN_4BIT_DATA)) | n,
|
|
- host->base + GLAMO_REG_MMC_BASIC);
|
|
+ (~(GLAMO_BASIC_MMC_EN_4BIT_DATA |
|
|
+ GLAMO_BASIC_MMC_EN_DR_STR0 |
|
|
+ GLAMO_BASIC_MMC_EN_DR_STR1))) | n |
|
|
+ sd_drive << 6, host->base + GLAMO_REG_MMC_BASIC);
|
|
}
|
|
|
|
|
|
--
|
|
1.5.6.3
|
|
|