diff options
Diffstat (limited to 'target/linux/xburst/patches-3.2/0013-MMC-JZ4740-Added-support-for-CPU-frequency-changing.patch')
| -rw-r--r-- | target/linux/xburst/patches-3.2/0013-MMC-JZ4740-Added-support-for-CPU-frequency-changing.patch | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/target/linux/xburst/patches-3.2/0013-MMC-JZ4740-Added-support-for-CPU-frequency-changing.patch b/target/linux/xburst/patches-3.2/0013-MMC-JZ4740-Added-support-for-CPU-frequency-changing.patch deleted file mode 100644 index f42d67a6fa..0000000000 --- a/target/linux/xburst/patches-3.2/0013-MMC-JZ4740-Added-support-for-CPU-frequency-changing.patch +++ /dev/null @@ -1,129 +0,0 @@ -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); |