aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/s3c24xx/patches-2.6.24/1235-fix-force-sdcard-clk-off-when-idle.patch.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/s3c24xx/patches-2.6.24/1235-fix-force-sdcard-clk-off-when-idle.patch.patch')
-rw-r--r--target/linux/s3c24xx/patches-2.6.24/1235-fix-force-sdcard-clk-off-when-idle.patch.patch240
1 files changed, 0 insertions, 240 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.24/1235-fix-force-sdcard-clk-off-when-idle.patch.patch b/target/linux/s3c24xx/patches-2.6.24/1235-fix-force-sdcard-clk-off-when-idle.patch.patch
deleted file mode 100644
index 327b450129..0000000000
--- a/target/linux/s3c24xx/patches-2.6.24/1235-fix-force-sdcard-clk-off-when-idle.patch.patch
+++ /dev/null
@@ -1,240 +0,0 @@
-From 5d70edcbe3ff5f6d5aef54ee9e278ad1ce431fd5 Mon Sep 17 00:00:00 2001
-From: Andy Green <andy@openmoko.com>
-Date: Thu, 17 Jul 2008 10:02:19 +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 f264a6c..350b47d 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_info(&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;
- }
---
-1.5.6.5
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 01:48:53 +0000