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