From 28035a98dc9820c065dc64ad3016a1f71a9911f2 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Mon, 4 Apr 2016 12:35:51 +0100 Subject: [PATCH 226/232] Revert "bcm2835-sdhost: Adjust to core clock changes" This reverts commit 4b89d07fd299a0f4e25321920cb74416ba2e638e. --- drivers/mmc/host/Kconfig | 1 - drivers/mmc/host/bcm2835-sdhost.c | 140 ++++++-------------------------------- 2 files changed, 22 insertions(+), 119 deletions(-) --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -36,7 +36,6 @@ config MMC_BCM2835_PIO_DMA_BARRIER config MMC_BCM2835_SDHOST tristate "Support for the SDHost controller on BCM2708/9" depends on MACH_BCM2708 || MACH_BCM2709 || ARCH_BCM2835 - depends on RASPBERRYPI_FIRMWARE help This selects the SDHost controller on BCM2835/6. --- a/drivers/mmc/host/bcm2835-sdhost.c +++ b/drivers/mmc/host/bcm2835-sdhost.c @@ -50,10 +50,6 @@ #include #include #include -#include -#include -#include - #define DRIVER_NAME "sdhost-bcm2835" @@ -140,8 +136,6 @@ #define MHZ 1000000 -#define RPI_FIRMWARE_CLOCK_CORE 4 - struct bcm2835_host { spinlock_t lock; @@ -157,9 +151,7 @@ struct bcm2835_host { bool slow_card; /* Force 11-bit divisor */ - unsigned int max_clk; /* Max src clock freq */ - unsigned int min_clk; /* Min src clock freq */ - unsigned int cur_clk; /* Current src clock freq */ + unsigned int max_clk; /* Max possible freq */ struct tasklet_struct finish_tasklet; /* Tasklet structures */ @@ -191,7 +183,6 @@ struct bcm2835_host { unsigned int use_sbc:1; /* Send CMD23 */ unsigned int debug:1; /* Enable debug output */ - unsigned int variable_clock:1; /* The core clock may change */ /*DMA part*/ struct dma_chan *dma_chan_rxtx; /* DMA channel for reads and writes */ @@ -217,9 +208,6 @@ struct bcm2835_host { u32 pio_limit; /* Maximum block count for PIO (0 = always DMA) */ u32 sectors; /* Cached card size in sectors */ - - struct notifier_block cpufreq_nb; /* The cpufreq callback list item */ - struct semaphore cpufreq_semaphore; /* Interlock between SD activity and cpufreq changes */ }; #if ENABLE_LOG @@ -239,10 +227,6 @@ static u32 sdhost_log_idx; static spinlock_t log_lock; static void __iomem *timer_base; -static int bcm2835_sdhost_cpufreq_callback(struct notifier_block *nb, - unsigned long action, void *data); -static unsigned int get_core_clock(unsigned int mode); - #define LOG_ENTRIES (256*1) #define LOG_SIZE (sizeof(LOG_ENTRY_T)*LOG_ENTRIES) @@ -464,14 +448,20 @@ static void bcm2835_sdhost_reset(struct static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios); -static void bcm2835_sdhost_init(struct bcm2835_host *host) +static void bcm2835_sdhost_init(struct bcm2835_host *host, int soft) { - pr_debug("bcm2835_sdhost_init()\n"); + pr_debug("bcm2835_sdhost_init(%d)\n", soft); /* Set interrupt enables */ host->hcfg = SDHCFG_BUSY_IRPT_EN; bcm2835_sdhost_reset_internal(host); + + if (soft) { + /* force clock reconfiguration */ + host->clock = 0; + bcm2835_sdhost_set_ios(host->mmc, &host->mmc->ios); + } } static void bcm2835_sdhost_wait_transfer_complete(struct bcm2835_host *host) @@ -1509,10 +1499,10 @@ static irqreturn_t bcm2835_sdhost_irq(in return result; } -void bcm2835_sdhost_set_clock(struct bcm2835_host *host) +void bcm2835_sdhost_set_clock(struct bcm2835_host *host, unsigned int clock) { int div = 0; /* Initialized for compiler warning */ - unsigned int clock = host->clock; + unsigned int input_clock = clock; if (host->debug) pr_info("%s: set_clock(%d)\n", mmc_hostname(host->mmc), clock); @@ -1553,17 +1543,17 @@ void bcm2835_sdhost_set_clock(struct bcm return; } - div = host->cur_clk / clock; + div = host->max_clk / clock; if (div < 2) div = 2; - if ((host->cur_clk / div) > clock) + if ((host->max_clk / div) > clock) div++; div -= 2; if (div > SDCDIV_MAX_CDIV) div = SDCDIV_MAX_CDIV; - clock = host->cur_clk / (div + 2); + clock = host->max_clk / (div + 2); host->mmc->actual_clock = clock; /* Calibrate some delays */ @@ -1571,7 +1561,7 @@ void bcm2835_sdhost_set_clock(struct bcm host->ns_per_fifo_word = (1000000000/clock) * ((host->mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32); - if (clock > host->clock) { + if (clock > input_clock) { /* Save the closest value, to make it easier to reduce in the event of error */ host->overclock_50 = (clock/MHZ); @@ -1597,9 +1587,9 @@ void bcm2835_sdhost_set_clock(struct bcm bcm2835_sdhost_write(host, host->mmc->actual_clock/2, SDTOUT); if (host->debug) - pr_info("%s: clock=%d -> cur_clk=%d, cdiv=%x (actual clock %d)\n", - mmc_hostname(host->mmc), host->clock, - host->cur_clk, host->cdiv, host->mmc->actual_clock); + pr_info("%s: clock=%d -> max_clk=%d, cdiv=%x (actual clock %d)\n", + mmc_hostname(host->mmc), input_clock, + host->max_clk, host->cdiv, host->mmc->actual_clock); } static void bcm2835_sdhost_request(struct mmc_host *mmc, struct mmc_request *mrq) @@ -1648,13 +1638,6 @@ static void bcm2835_sdhost_request(struc (mrq->data->blocks > host->pio_limit)) bcm2835_sdhost_prepare_dma(host, mrq->data); - if (host->variable_clock && - (down_killable(&host->cpufreq_semaphore) != 0)) { - mrq->cmd->error = -EINTR; - mmc_request_done(mmc, mrq); - return; - } - spin_lock_irqsave(&host->lock, flags); WARN_ON(host->mrq != NULL); @@ -1704,52 +1687,6 @@ static void bcm2835_sdhost_request(struc spin_unlock_irqrestore(&host->lock, flags); } -static int bcm2835_sdhost_cpufreq_callback(struct notifier_block *nb, - unsigned long action, void *data) -{ - struct cpufreq_freqs *freq = data; - struct bcm2835_host *host; - - host = container_of(nb, struct bcm2835_host, cpufreq_nb); - - if (freq->cpu == 0) { - switch (action) { - case CPUFREQ_PRECHANGE: - if (down_killable(&host->cpufreq_semaphore) != 0) - return NOTIFY_BAD; - break; - case CPUFREQ_POSTCHANGE: - if (freq->new > freq->old) - host->cur_clk = host->max_clk; - else - host->cur_clk = host->min_clk; - bcm2835_sdhost_set_clock(host); - up(&host->cpufreq_semaphore); - break; - default: - break; - } - } - return NOTIFY_OK; -} - -static unsigned int get_core_clock(unsigned int mode) -{ - struct rpi_firmware *fw = rpi_firmware_get(NULL); - struct { - u32 id; - u32 val; - } packet; - int ret; - - packet.id = RPI_FIRMWARE_CLOCK_CORE; - ret = rpi_firmware_property(fw, mode, &packet, sizeof(packet)); - if (ret) - return 0; - - return packet.val; -} - static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { @@ -1763,16 +1700,13 @@ static void bcm2835_sdhost_set_ios(struc ios->clock, ios->power_mode, ios->bus_width, ios->timing, ios->signal_voltage, ios->drv_type); - if (ios->clock && !host->cur_clk) - host->cur_clk = get_core_clock(RPI_FIRMWARE_GET_CLOCK_RATE); - spin_lock_irqsave(&host->lock, flags); log_event("IOS<", ios->clock, 0); if (!ios->clock || ios->clock != host->clock) { + bcm2835_sdhost_set_clock(host, ios->clock); host->clock = ios->clock; - bcm2835_sdhost_set_clock(host); } /* set bus width */ @@ -1861,7 +1795,7 @@ static void bcm2835_sdhost_tasklet_finis host->overclock_50--; pr_warn("%s: reducing overclock due to errors\n", mmc_hostname(host->mmc)); - bcm2835_sdhost_set_clock(host); + bcm2835_sdhost_set_clock(host,50*MHZ); mrq->cmd->error = -EILSEQ; mrq->cmd->retries = 1; } @@ -1879,9 +1813,6 @@ static void bcm2835_sdhost_tasklet_finis spin_unlock_irqrestore(&host->lock, flags); - if (host->variable_clock) - up(&host->cpufreq_semaphore); - if (terminate_chan) { int err = dmaengine_terminate_all(terminate_chan); @@ -1984,10 +1915,10 @@ int bcm2835_sdhost_add_host(struct bcm28 setup_timer(&host->timer, bcm2835_sdhost_timeout, (unsigned long)host); - bcm2835_sdhost_init(host); + bcm2835_sdhost_init(host, 0); ret = request_irq(host->irq, bcm2835_sdhost_irq, 0 /*IRQF_SHARED*/, - mmc_hostname(mmc), host); + mmc_hostname(mmc), host); if (ret) { pr_err("%s: failed to request IRQ %d: %d\n", mmc_hostname(mmc), host->irq, ret); @@ -2022,7 +1953,6 @@ static int bcm2835_sdhost_probe(struct p struct bcm2835_host *host; struct mmc_host *mmc; const __be32 *addr; - unsigned int max_clk; int ret; pr_debug("bcm2835_sdhost_probe\n"); @@ -2132,28 +2062,6 @@ static int bcm2835_sdhost_probe(struct p if (ret) goto err; - /* Query the core clock frequencies */ - host->min_clk = get_core_clock(RPI_FIRMWARE_GET_MIN_CLOCK_RATE); - max_clk = get_core_clock(RPI_FIRMWARE_GET_MAX_CLOCK_RATE); - if (max_clk != host->max_clk) { - pr_warn("%s: Expected max clock %d, found %d\n", - mmc_hostname(mmc), host->max_clk, max_clk); - host->max_clk = max_clk; - } - - if (host->min_clk != host->max_clk) { - host->cpufreq_nb.notifier_call = - bcm2835_sdhost_cpufreq_callback; - sema_init(&host->cpufreq_semaphore, 1); - cpufreq_register_notifier(&host->cpufreq_nb, - CPUFREQ_TRANSITION_NOTIFIER); - host->variable_clock = 1; - host->cur_clk = 0; /* Get this later */ - } else { - host->variable_clock = 0; - host->cur_clk = host->max_clk; - } - platform_set_drvdata(pdev, host); pr_debug("bcm2835_sdhost_probe -> OK\n"); @@ -2173,10 +2081,6 @@ static int bcm2835_sdhost_remove(struct pr_debug("bcm2835_sdhost_remove\n"); - if (host->variable_clock) - cpufreq_unregister_notifier(&host->cpufreq_nb, - CPUFREQ_TRANSITION_NOTIFIER); - mmc_remove_host(host->mmc); bcm2835_sdhost_set_power(host, false);