change prefix for kernelpatchbase 2.6.26

SVN-Revision: 13619

1 files changed, 240 insertions, 0 deletions

diff --git a/target/linux/s3c24xx/patches-2.6.26/1214-fix-force-sdcard-clk-off-when-idle.patch.patch b/target/linux/s3c24xx/patches-2.6.26/1214-fix-force-sdcard-clk-off-when-idle.patch.patch
new file mode 100755
index 0000000000..13dc94036f
--- /dev/null
+++ b/target/linux/s3c24xx/patches-2.6.26/1214-fix-force-sdcard-clk-off-when-idle.patch.patch
@@ -0,0 +1,240 @@
+From ee83ea40a3a1d1cb6447fdd345384d9cabf21c83 Mon Sep 17 00:00:00 2001
+From: Andy Green <andy@openmoko.com>
+Date: Fri, 25 Jul 2008 23:06:20 +0100
+Subject: [PATCH] fix-force-sdcard-clk-off-when-idle.patch
+
+Existing Glamo bit for stopping SD Card Clock when there is no
+transfer taking place does not work.  This patch adds stuff around
+the transfer code to force the SD clock up when something is going on
+and down when it is idle.  This'll save a little power and noise ;-)
+
+I tested it briefly and was able to SD Boot normally on Sandisk 512M.
+Wider testing is appreciated.
+
+Signed-off-by: Andy Green <andy@openmoko.com>
+---
+ drivers/mfd/glamo/glamo-mci.c |  126 +++++++++++++++++++++++++++++------------
+ 1 files changed, 89 insertions(+), 37 deletions(-)
+
+diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
+index 37e3d3c..b53827e 100644
+--- a/drivers/mfd/glamo/glamo-mci.c
++++ b/drivers/mfd/glamo/glamo-mci.c
+@@ -20,6 +20,7 @@
+ #include <linux/pcf50633.h>
+ #include <linux/delay.h>
+ #include <linux/interrupt.h>
++#include <linux/spinlock.h>
+ 
+ #include <asm/dma.h>
+ #include <asm/dma-mapping.h>
+@@ -32,6 +33,7 @@
+ /* from glamo-core.c */
+ extern struct glamo_mci_pdata glamo_mci_def_pdata;
+ 
++static spinlock_t clock_lock;
+ 
+ #define DRIVER_NAME "glamo-mci"
+ #define RESSIZE(ressource) (((ressource)->end - (ressource)->start) + 1)
+@@ -164,6 +166,67 @@ static int do_pio_write(struct glamo_mci_host *host)
+ 	return err;
+ }
+ 
++static void __glamo_mci_fix_card_div(struct glamo_mci_host *host, int div)
++{
++	unsigned long flags;
++
++	spin_lock_irqsave(&clock_lock, flags);
++
++	if (div < 0) {
++		/* stop clock - remove clock from divider input */
++		writew(readw(glamo_mci_def_pdata.pglamo->base +
++		     GLAMO_REG_CLOCK_GEN5_1) & (~GLAMO_CLOCK_GEN51_EN_DIV_TCLK),
++		     glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
++	} else {
++		/* set the nearest prescaler factor
++		*
++		* register shared with SCLK divisor -- no chance of race because
++		* we don't use sensor interface
++		*/
++		writew_dly((readw(glamo_mci_def_pdata.pglamo->base +
++				GLAMO_REG_CLOCK_GEN8) & 0xff00) | div,
++		       glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN8);
++		/* enable clock to divider input */
++		writew_dly(readw(glamo_mci_def_pdata.pglamo->base +
++			GLAMO_REG_CLOCK_GEN5_1) | GLAMO_CLOCK_GEN51_EN_DIV_TCLK,
++		     glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
++	}
++
++	spin_unlock_irqrestore(&clock_lock, flags);
++}
++
++static int __glamo_mci_set_card_clock(struct glamo_mci_host *host, int freq,
++								  int *division)
++{
++	int div = 0;
++	int real_rate = 0;
++
++	if (freq) {
++		/* Set clock */
++		for (div = 0; div < 256; div++) {
++			real_rate = host->clk_rate / (div + 1);
++			if (real_rate <= freq)
++				break;
++		}
++		if (div > 255)
++			div = 255;
++
++		if (division)
++			*division = div;
++
++		__glamo_mci_fix_card_div(host, div);
++
++	} else {
++		/* stop clock */
++		if (division)
++			*division = 0xff;
++
++		__glamo_mci_fix_card_div(host, -1); /* clock off */
++	}
++
++	return real_rate;
++}
++
+ static void glamo_mci_irq(unsigned int irq, struct irq_desc *desc)
+ {
+ 	struct glamo_mci_host *host = (struct glamo_mci_host *)
+@@ -212,6 +275,10 @@ static void glamo_mci_irq(unsigned int irq, struct irq_desc *desc)
+ 		glamo_mci_send_request(host->mmc);
+ 		host->cmd_is_stop = 0;
+ 	}
++
++	/* clock off */
++	__glamo_mci_fix_card_div(host, -1);
++
+ done:
+ 	host->complete_what = COMPLETION_NONE;
+ 	host->mrq = NULL;
+@@ -441,8 +508,11 @@ 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);
++
+ 	if (glamo_mci_send_command(host, cmd))
+-		return;
++		goto bail;
+ 	/*
+ 	 * we must spin until response is ready or timed out
+ 	 * -- we don't get interrupts unless there is a bulk rx
+@@ -464,7 +534,7 @@ static void glamo_mci_send_request(struct mmc_host *mmc)
+ 		cmd->error = -EILSEQ;
+ 
+ 	if (host->cmd_is_stop)
+-		return;
++		goto bail;
+ 
+ 	if (cmd->error) {
+ 		dev_err(&host->pdev->dev, "Error after cmd: 0x%x\n", status);
+@@ -516,10 +586,12 @@ static void glamo_mci_send_request(struct mmc_host *mmc)
+ 			if (cmd->data->error)
+ 				cmd->data->error = -ETIMEDOUT;
+ 			dev_err(&host->pdev->dev, "Payload timeout\n");
+-			return;
++			goto bail;
+ 		}
+ 
+-		/* yay we are an interrupt controller! -- call the ISR */
++		/* yay we are an interrupt controller! -- call the ISR
++		 * it will stop clock to card
++		 */
+ 		glamo_mci_irq(IRQ_GLAMO(GLAMO_IRQIDX_MMC),
+ 			      irq_desc + IRQ_GLAMO(GLAMO_IRQIDX_MMC));
+ 	}
+@@ -529,6 +601,12 @@ done:
+ 	host->complete_what = COMPLETION_NONE;
+ 	host->mrq = NULL;
+ 	mmc_request_done(host->mmc, cmd->mrq);
++	return;
++
++bail:
++	/* stop the clock to card */
++	__glamo_mci_fix_card_div(host, -1);
++	return;
+ }
+ 
+ static void glamo_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+@@ -556,11 +634,12 @@ static void glamo_mci_reset(struct glamo_mci_host *host)
+ 		   glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_MMC);
+ }
+ 
++
+ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+ {
+ 	struct glamo_mci_host *host = mmc_priv(mmc);
+-	int mci_psc = 0;
+ 	int n = 0;
++	int div;
+ 
+ 	/* Set power */
+ 	switch(ios->power_mode) {
+@@ -590,43 +669,15 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+ 	}
+ 	host->power_mode_current = ios->power_mode;
+ 
+-	 /* Set clock */
+-/*	if (ios->clock) { */
+-	for (mci_psc = 0; mci_psc < 256; mci_psc++) {
+-		host->real_rate = host->clk_rate / (mci_psc + 1);
+-		if (host->real_rate <= ios->clock)
+-			break;
+-	}
+-	if (mci_psc > 255)
+-		mci_psc = 255;
+-	host->clk_div = mci_psc;
+-	/* set the nearest prescaler factor
+-	*
+-	* register shared with SCLK divisor -- no chance of race because
+-	* we don't use sensor interface
+-	*/
+-	writew_dly((readw(glamo_mci_def_pdata.pglamo->base +
+-			GLAMO_REG_CLOCK_GEN8) & 0xff00) | host->clk_div,
+-		glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN8);
+-	/* enable clock to divider input */
+-	writew_dly(readw(glamo_mci_def_pdata.pglamo->base +
+-		GLAMO_REG_CLOCK_GEN5_1) | GLAMO_CLOCK_GEN51_EN_DIV_TCLK,
+-		glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
+-#if 0
+-	} else { /* stop clock */
+-		host->real_rate = 0;
+-		/* remove clock from divider input */
+-		writew(readw(glamo_mci_def_pdata.pglamo->base +
+-		     GLAMO_REG_CLOCK_GEN5_1) & (~GLAMO_CLOCK_GEN51_EN_DIV_TCLK),
+-		     glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
+-	}
+-#endif
++	host->real_rate = __glamo_mci_set_card_clock(host, ios->clock, &div);
++	host->clk_div = div;
++
+ 	if ((ios->power_mode == MMC_POWER_ON) ||
+ 	    (ios->power_mode == MMC_POWER_UP)) {
+ 		dev_info(&host->pdev->dev,
+ 			"powered (vdd = %d) clk: %lukHz div=%d (req: %ukHz). "
+ 			"Bus width=%d\n",ios->vdd,
+-			host->real_rate / 1000, mci_psc,
++			host->real_rate / 1000, host->real_rate,
+ 			ios->clock / 1000, ios->bus_width);
+ 	} else
+ 		dev_info(&host->pdev->dev, "glamo_mci_set_ios: power down.\n");
+@@ -856,6 +907,7 @@ static struct platform_driver glamo_mci_driver =
+ 
+ static int __init glamo_mci_init(void)
+ {
++	spin_lock_init(&clock_lock);
+ 	platform_driver_register(&glamo_mci_driver);
+ 	return 0;
+ }
+-- 
+1.5.6.3
+