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fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
162 lines
4.9 KiB
Diff
162 lines
4.9 KiB
Diff
From d944934bbddc281938fb1905a69e35c0581937c2 Mon Sep 17 00:00:00 2001
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From: Mike Westerhof <mwester@dls.net>
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Date: Thu, 13 Nov 2008 20:39:36 +0000
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Subject: [PATCH] GTA01-use-slow-SD-clock-when-gps-on.patch
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This patch implements Andy Green's SD clock slow-down code
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for the GTA01 device.
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Signed-off-by: Mike Westerhof <mwester@dls.net>
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---
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arch/arm/mach-s3c2410/mach-gta01.c | 8 ++++++
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drivers/mmc/host/s3cmci.c | 43 ++++++++++++++++++++++++++++++++++-
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drivers/mmc/host/s3cmci.h | 1 +
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include/asm-arm/arch-s3c2410/mci.h | 1 +
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4 files changed, 51 insertions(+), 2 deletions(-)
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diff --git a/arch/arm/mach-s3c2410/mach-gta01.c b/arch/arm/mach-s3c2410/mach-gta01.c
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index a364b76..c0817dc 100644
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--- a/arch/arm/mach-s3c2410/mach-gta01.c
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+++ b/arch/arm/mach-s3c2410/mach-gta01.c
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@@ -75,6 +75,8 @@
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#include <asm/plat-s3c24xx/neo1973.h>
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#include <asm/arch-s3c2410/neo1973-pm-gsm.h>
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+#include "../plat-s3c24xx/neo1973_pm_gps.h"
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+
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#include <linux/jbt6k74.h>
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static struct map_desc gta01_iodesc[] __initdata = {
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@@ -432,9 +434,15 @@ static void gta01_mmc_set_power(unsigned char power_mode, unsigned short vdd)
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}
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}
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+static int gta01_mmc_use_slow(void)
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+{
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+ return neo1973_pm_gps_is_on();
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+}
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+
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static struct s3c24xx_mci_pdata gta01_mmc_cfg = {
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.gpio_detect = GTA01_GPIO_nSD_DETECT,
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.set_power = >a01_mmc_set_power,
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+ .use_slow = >a01_mmc_use_slow,
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.ocr_avail = MMC_VDD_165_195|MMC_VDD_20_21|
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MMC_VDD_21_22|MMC_VDD_22_23|MMC_VDD_23_24|
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MMC_VDD_24_25|MMC_VDD_25_26|MMC_VDD_26_27|
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diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
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index 8f88721..87d24b2 100644
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--- a/drivers/mmc/host/s3cmci.c
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+++ b/drivers/mmc/host/s3cmci.c
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@@ -59,6 +59,23 @@ module_param(sd_max_clk, int, 0644);
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static int sd_idleclk; /* disallow idle clock by default */
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module_param(sd_idleclk, int, 0644);
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+/*
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+ * Slow SD clock rate
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+ *
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+ * you can override this on kernel commandline using
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+ *
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+ * s3cmci.sd_slow_ratio=8
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+ *
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+ * for example.
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+ *
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+ * A platform callback is used to decide effective clock rate. If not
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+ * defined, then the max is used, if defined and the callback returns
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+ * nonzero, the rate is divided by this factor.
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+ */
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+
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+static int sd_slow_ratio = 8;
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+module_param(sd_slow_ratio, int, 0644);
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+
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/* used to stash real idleclk state in suspend: we force it to run in there */
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static int suspend_sd_idleclk;
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@@ -252,7 +269,7 @@ static inline void do_pio_read(struct s3cmci_host *host)
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void __iomem *from_ptr;
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/* write real prescaler to host, it might be set slow to fix */
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- writel(host->prescaler, host->base + S3C2410_SDIPRE);
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+ writel(host->sdipre, host->base + S3C2410_SDIPRE);
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from_ptr = host->base + host->sdidata;
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@@ -755,7 +772,7 @@ static void finalize_request(struct s3cmci_host *host)
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cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
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/* reset clock speed, as it could still be set low for */
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- writel(host->prescaler, host->base + S3C2410_SDIPRE);
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+ writel(host->sdipre, host->base + S3C2410_SDIPRE);
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if (cmd->error)
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debug_as_failure = 1;
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@@ -1032,6 +1049,7 @@ static void s3cmci_send_request(struct mmc_host *mmc)
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struct s3cmci_host *host = mmc_priv(mmc);
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struct mmc_request *mrq = host->mrq;
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struct mmc_command *cmd = host->cmd_is_stop?mrq->stop:mrq->cmd;
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+ int pre;
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host->ccnt++;
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#ifdef CONFIG_MMC_DEBUG
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@@ -1073,6 +1091,26 @@ static void s3cmci_send_request(struct mmc_host *mmc)
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}
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+ /* establish the correct prescaler depending on the sd_slow_ratio */
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+
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+ if ((sd_slow_ratio > 1) &&
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+ host->pdata->use_slow && (host->pdata->use_slow)()) {
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+ /* compute the slower speed */
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+ pre = host->prescaler * sd_slow_ratio;
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+ if (pre > 255)
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+ pre = 255;
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+ } else {
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+ /* use the normal speed */
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+ pre = host->prescaler;
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+ }
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+
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+ if (host->sdipre != pre) {
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+ dbg(host, dbg_conf, "prescaler changed: %d -> %d\n",
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+ (int)host->sdipre, pre);
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+ host->sdipre = pre;
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+ writel(host->sdipre, host->base + S3C2410_SDIPRE);
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+ }
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+
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__s3cmci_enable_clock(host);
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s3cmci_send_command(host, cmd);
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enable_irq(host->irq);
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@@ -1138,6 +1176,7 @@ static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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if (mci_psc > 255)
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mci_psc = 255;
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host->prescaler = mci_psc;
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+ host->sdipre = mci_psc;
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writel(host->prescaler, host->base + S3C2410_SDIPRE);
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diff --git a/drivers/mmc/host/s3cmci.h b/drivers/mmc/host/s3cmci.h
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index 9644b45..11974ff 100644
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--- a/drivers/mmc/host/s3cmci.h
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+++ b/drivers/mmc/host/s3cmci.h
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@@ -32,6 +32,7 @@ struct s3cmci_host {
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unsigned long clk_div;
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unsigned long real_rate;
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u8 prescaler;
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+ u8 sdipre;
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int is2440;
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unsigned sdiimsk;
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diff --git a/include/asm-arm/arch-s3c2410/mci.h b/include/asm-arm/arch-s3c2410/mci.h
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index 24e6cd1..f087229 100644
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--- a/include/asm-arm/arch-s3c2410/mci.h
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+++ b/include/asm-arm/arch-s3c2410/mci.h
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@@ -8,6 +8,7 @@ struct s3c24xx_mci_pdata {
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unsigned int do_dma;
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void (*set_power)(unsigned char power_mode,
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unsigned short vdd);
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+ int (*use_slow)(void);
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};
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#endif /* _ARCH_NCI_H */
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--
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1.5.6.5
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