mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 06:33:41 +00:00
130 lines
3.7 KiB
Diff
130 lines
3.7 KiB
Diff
From b95144c1b702f98c7902c75beb83f323701eb7c5 Mon Sep 17 00:00:00 2001
|
|
From: Maarten ter Huurne <maarten@treewalker.org>
|
|
Date: Sun, 19 Jun 2011 10:57:18 +0200
|
|
Subject: [PATCH 13/21] MMC: JZ4740: Added support for CPU frequency changing.
|
|
|
|
The MSC device clock is stopped before the frequency change.
|
|
After the change a new divider is computed and the clock is restarted.
|
|
Also the frequency change is postponed if an I/O operation is in progress.
|
|
---
|
|
drivers/mmc/host/jz4740_mmc.c | 69 +++++++++++++++++++++++++++++++++++++++-
|
|
1 files changed, 67 insertions(+), 2 deletions(-)
|
|
|
|
--- a/drivers/mmc/host/jz4740_mmc.c
|
|
+++ b/drivers/mmc/host/jz4740_mmc.c
|
|
@@ -23,6 +23,7 @@
|
|
#include <linux/delay.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/clk.h>
|
|
+#include <linux/cpufreq.h>
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/gpio.h>
|
|
@@ -685,6 +686,60 @@ static void jz4740_mmc_enable_sdio_irq(s
|
|
jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
|
|
}
|
|
|
|
+#ifdef CONFIG_CPU_FREQ
|
|
+
|
|
+static struct jz4740_mmc_host *cpufreq_host;
|
|
+
|
|
+static int jz4740_mmc_cpufreq_transition(struct notifier_block *nb,
|
|
+ unsigned long val, void *data)
|
|
+{
|
|
+ /* TODO: We only have to take action when the PLL freq changes:
|
|
+ the main dividers have no influence on the MSC device clock. */
|
|
+
|
|
+ if (val == CPUFREQ_PRECHANGE) {
|
|
+ mmc_claim_host(cpufreq_host->mmc);
|
|
+ clk_disable(cpufreq_host->clk);
|
|
+ } else if (val == CPUFREQ_POSTCHANGE) {
|
|
+ struct mmc_ios *ios = &cpufreq_host->mmc->ios;
|
|
+ if (ios->clock)
|
|
+ jz4740_mmc_set_clock_rate(cpufreq_host, ios->clock);
|
|
+ if (ios->power_mode != MMC_POWER_OFF)
|
|
+ clk_enable(cpufreq_host->clk);
|
|
+ mmc_release_host(cpufreq_host->mmc);
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct notifier_block jz4740_mmc_cpufreq_nb = {
|
|
+ .notifier_call = jz4740_mmc_cpufreq_transition,
|
|
+};
|
|
+
|
|
+static inline int jz4740_mmc_cpufreq_register(struct jz4740_mmc_host *host)
|
|
+{
|
|
+ cpufreq_host = host;
|
|
+ return cpufreq_register_notifier(&jz4740_mmc_cpufreq_nb,
|
|
+ CPUFREQ_TRANSITION_NOTIFIER);
|
|
+}
|
|
+
|
|
+static inline void jz4740_mmc_cpufreq_unregister(void)
|
|
+{
|
|
+ cpufreq_unregister_notifier(&jz4740_mmc_cpufreq_nb,
|
|
+ CPUFREQ_TRANSITION_NOTIFIER);
|
|
+}
|
|
+
|
|
+#else
|
|
+
|
|
+static inline int jz4740_mmc_cpufreq_register(struct jz4740_mmc_host *host)
|
|
+{
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static inline void jz4740_mmc_cpufreq_unregister(void)
|
|
+{
|
|
+}
|
|
+
|
|
+#endif
|
|
+
|
|
static const struct mmc_host_ops jz4740_mmc_ops = {
|
|
.request = jz4740_mmc_request,
|
|
.set_ios = jz4740_mmc_set_ios,
|
|
@@ -834,11 +889,18 @@ static int __devinit jz4740_mmc_probe(st
|
|
goto err_free_host;
|
|
}
|
|
|
|
+ ret = jz4740_mmc_cpufreq_register(host);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev,
|
|
+ "Failed to register cpufreq transition notifier\n");
|
|
+ goto err_clk_put;
|
|
+ }
|
|
+
|
|
host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!host->mem) {
|
|
ret = -ENOENT;
|
|
dev_err(&pdev->dev, "Failed to get base platform memory\n");
|
|
- goto err_clk_put;
|
|
+ goto err_cpufreq_unreg;
|
|
}
|
|
|
|
host->mem = request_mem_region(host->mem->start,
|
|
@@ -846,7 +908,7 @@ static int __devinit jz4740_mmc_probe(st
|
|
if (!host->mem) {
|
|
ret = -EBUSY;
|
|
dev_err(&pdev->dev, "Failed to request base memory region\n");
|
|
- goto err_clk_put;
|
|
+ goto err_cpufreq_unreg;
|
|
}
|
|
|
|
host->base = ioremap_nocache(host->mem->start, resource_size(host->mem));
|
|
@@ -929,6 +991,8 @@ err_iounmap:
|
|
iounmap(host->base);
|
|
err_release_mem_region:
|
|
release_mem_region(host->mem->start, resource_size(host->mem));
|
|
+err_cpufreq_unreg:
|
|
+ jz4740_mmc_cpufreq_unregister();
|
|
err_clk_put:
|
|
clk_put(host->clk);
|
|
err_free_host:
|
|
@@ -958,6 +1022,7 @@ static int __devexit jz4740_mmc_remove(s
|
|
iounmap(host->base);
|
|
release_mem_region(host->mem->start, resource_size(host->mem));
|
|
|
|
+ jz4740_mmc_cpufreq_unregister();
|
|
clk_put(host->clk);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|