| Date: | 2011-06-19 10:57:18 (11 years 11 months ago) |
|---|---|
| Author: | Maarten ter Huurne |
| Commit: | c9d94cdcee21e8aeed85632648c473235f14f3fe |
| Message: | 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. |
| Files: |
drivers/mmc/host/jz4740_mmc.c (5 diffs) |
Change Details
| drivers/mmc/host/jz4740_mmc.c | ||
|---|---|---|
| 24 | 24 | #include <linux/delay.h> |
| 25 | 25 | #include <linux/scatterlist.h> |
| 26 | 26 | #include <linux/clk.h> |
| 27 | #include <linux/cpufreq.h> | |
| 27 | 28 | |
| 28 | 29 | #include <linux/bitops.h> |
| 29 | 30 | #include <linux/gpio.h> |
| ... | ... | |
| 667 | 668 | jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable); |
| 668 | 669 | } |
| 669 | 670 | |
| 671 | #ifdef CONFIG_CPU_FREQ | |
| 672 | ||
| 673 | static struct jz4740_mmc_host *cpufreq_host; | |
| 674 | ||
| 675 | static int jz4740_mmc_cpufreq_transition(struct notifier_block *nb, | |
| 676 | unsigned long val, void *data) | |
| 677 | { | |
| 678 | /* TODO: We only have to take action when the PLL freq changes: | |
| 679 | the main dividers have no influence on the MSC device clock. */ | |
| 680 | ||
| 681 | if (val == CPUFREQ_PRECHANGE) { | |
| 682 | mmc_claim_host(cpufreq_host->mmc); | |
| 683 | clk_disable(cpufreq_host->clk); | |
| 684 | } else if (val == CPUFREQ_POSTCHANGE) { | |
| 685 | struct mmc_ios *ios = &cpufreq_host->mmc->ios; | |
| 686 | if (ios->clock) | |
| 687 | jz4740_mmc_set_clock_rate(cpufreq_host, ios->clock); | |
| 688 | if (ios->power_mode != MMC_POWER_OFF) | |
| 689 | clk_enable(cpufreq_host->clk); | |
| 690 | mmc_release_host(cpufreq_host->mmc); | |
| 691 | } | |
| 692 | return 0; | |
| 693 | } | |
| 694 | ||
| 695 | static struct notifier_block jz4740_mmc_cpufreq_nb = { | |
| 696 | .notifier_call = jz4740_mmc_cpufreq_transition, | |
| 697 | }; | |
| 698 | ||
| 699 | static inline int jz4740_mmc_cpufreq_register(struct jz4740_mmc_host *host) | |
| 700 | { | |
| 701 | cpufreq_host = host; | |
| 702 | return cpufreq_register_notifier(&jz4740_mmc_cpufreq_nb, | |
| 703 | CPUFREQ_TRANSITION_NOTIFIER); | |
| 704 | } | |
| 705 | ||
| 706 | static inline void jz4740_mmc_cpufreq_unregister(void) | |
| 707 | { | |
| 708 | cpufreq_unregister_notifier(&jz4740_mmc_cpufreq_nb, | |
| 709 | CPUFREQ_TRANSITION_NOTIFIER); | |
| 710 | } | |
| 711 | ||
| 712 | #else | |
| 713 | ||
| 714 | static inline int jz4740_mmc_cpufreq_register(struct jz4740_mmc_host *host) | |
| 715 | { | |
| 716 | return 0; | |
| 717 | } | |
| 718 | ||
| 719 | static inline void jz4740_mmc_cpufreq_unregister(void) | |
| 720 | { | |
| 721 | } | |
| 722 | ||
| 723 | #endif | |
| 724 | ||
| 670 | 725 | static const struct mmc_host_ops jz4740_mmc_ops = { |
| 671 | 726 | .request = jz4740_mmc_request, |
| 672 | 727 | .set_ios = jz4740_mmc_set_ios, |
| ... | ... | |
| 789 | 844 | goto err_free_host; |
| 790 | 845 | } |
| 791 | 846 | |
| 847 | ret = jz4740_mmc_cpufreq_register(host); | |
| 848 | if (ret) { | |
| 849 | dev_err(&pdev->dev, | |
| 850 | "Failed to register cpufreq transition notifier\n"); | |
| 851 | goto err_free_host; | |
| 852 | } | |
| 853 | ||
| 792 | 854 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 793 | 855 | host->base = devm_ioremap_resource(&pdev->dev, res); |
| 794 | 856 | if (IS_ERR(host->base)) { |
| 795 | 857 | ret = PTR_ERR(host->base); |
| 796 | goto err_free_host; | |
| 858 | dev_err(&pdev->dev, "Failed to ioremap base memory\n"); | |
| 859 | goto err_cpufreq_unreg; | |
| 797 | 860 | } |
| 798 | 861 | |
| 799 | 862 | ret = jz_gpio_bulk_request(jz4740_mmc_pins, jz4740_mmc_num_pins(host)); |
| 800 | 863 | if (ret) { |
| 801 | 864 | dev_err(&pdev->dev, "Failed to request mmc pins: %d\n", ret); |
| 802 | goto err_free_host; | |
| 865 | goto err_cpufreq_unreg; | |
| 803 | 866 | } |
| 804 | 867 | |
| 805 | 868 | ret = jz4740_mmc_request_gpios(mmc, pdev); |
| ... | ... | |
| 856 | 919 | jz4740_mmc_free_gpios(pdev); |
| 857 | 920 | err_gpio_bulk_free: |
| 858 | 921 | jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host)); |
| 922 | err_cpufreq_unreg: | |
| 923 | jz4740_mmc_cpufreq_unregister(); | |
| 859 | 924 | err_free_host: |
| 860 | 925 | mmc_free_host(mmc); |
| 861 | 926 | |
| ... | ... | |
| 877 | 942 | jz4740_mmc_free_gpios(pdev); |
| 878 | 943 | jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host)); |
| 879 | 944 | |
| 945 | jz4740_mmc_cpufreq_unregister(); | |
| 880 | 946 | mmc_free_host(host->mmc); |
| 881 | 947 | |
| 882 | 948 | return 0; |
Branches:
ben-wpan
ben-wpan-stefan
5396a9238205f20f811ea57898980d3ca82df0b6
jz-2.6.34
jz-2.6.34-rc5
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jz-3.6-rc2-pwm
jz-3.9
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jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9
