diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0009-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.1/0009-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch | 1765 |
1 files changed, 0 insertions, 1765 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0009-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch b/target/linux/brcm2708/patches-4.1/0009-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch deleted file mode 100644 index 50a901b187..0000000000 --- a/target/linux/brcm2708/patches-4.1/0009-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch +++ /dev/null @@ -1,1765 +0,0 @@ -From 74c824df73fca559e8d4114051f66eab362b441e Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.org> -Date: Wed, 25 Mar 2015 17:49:47 +0000 -Subject: [PATCH 009/222] Adding bcm2835-sdhost driver, and an overlay to - enable it - -BCM2835 has two SD card interfaces. This driver uses the other one. - -bcm2835-sdhost: Error handling fix, and code clarification - -bcm2835-sdhost: Adding overclocking option - -Allow a different clock speed to be substitued for a requested 50MHz. -This option is exposed using the "overclock_50" DT parameter. -Note that the sdhost interface is restricted to integer divisions of -core_freq, and the highest sensible option for a core_freq of 250MHz -is 84 (250/3 = 83.3MHz), the next being 125 (250/2) which is much too -high. - -Use at your own risk. - -bcm2835-sdhost: Round up the overclock, so 62 works for 62.5Mhz - -Also only warn once for each overclock setting. ---- - drivers/mmc/host/Kconfig | 10 + - drivers/mmc/host/Makefile | 1 + - drivers/mmc/host/bcm2835-sdhost.c | 1702 +++++++++++++++++++++++++++++++++++++ - 3 files changed, 1713 insertions(+) - create mode 100644 drivers/mmc/host/bcm2835-sdhost.c - ---- a/drivers/mmc/host/Kconfig -+++ b/drivers/mmc/host/Kconfig -@@ -33,6 +33,16 @@ config MMC_BCM2835_PIO_DMA_BARRIER - - If unsure, say 2 here. - -+config MMC_BCM2835_SDHOST -+ tristate "Support for the SDHost controller on BCM2708/9" -+ depends on MACH_BCM2708 || MACH_BCM2709 || ARCH_BCM2835 -+ help -+ This selects the SDHost controller on BCM2835/6. -+ -+ If you have a controller with this interface, say Y or M here. -+ -+ If unsure, say N. -+ - config MMC_ARMMMCI - tristate "ARM AMBA Multimedia Card Interface support" - depends on ARM_AMBA ---- a/drivers/mmc/host/Makefile -+++ b/drivers/mmc/host/Makefile -@@ -18,6 +18,7 @@ obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c - obj-$(CONFIG_MMC_SDHCI_SIRF) += sdhci-sirf.o - obj-$(CONFIG_MMC_SDHCI_F_SDH30) += sdhci_f_sdh30.o - obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o -+obj-$(CONFIG_MMC_BCM2835_SDHOST) += bcm2835-sdhost.o - obj-$(CONFIG_MMC_BCM2835) += bcm2835-mmc.o - obj-$(CONFIG_MMC_WBSD) += wbsd.o - obj-$(CONFIG_MMC_AU1X) += au1xmmc.o ---- /dev/null -+++ b/drivers/mmc/host/bcm2835-sdhost.c -@@ -0,0 +1,1702 @@ -+/* -+ * BCM2835 SD host driver. -+ * -+ * Author: Phil Elwell <phil@raspberrypi.org> -+ * Copyright 2015 -+ * -+ * Based on -+ * mmc-bcm2835.c by Gellert Weisz -+ * which is, in turn, based on -+ * sdhci-bcm2708.c by Broadcom -+ * sdhci-bcm2835.c by Stephen Warren and Oleksandr Tymoshenko -+ * sdhci.c and sdhci-pci.c by Pierre Ossman -+ * -+ * This program is free software; you can redistribute it and/or modify it -+ * under the terms and conditions of the GNU General Public License, -+ * version 2, as published by the Free Software Foundation. -+ * -+ * This program is distributed in the hope it will be useful, but WITHOUT -+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or -+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for -+ * more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. If not, see <http://www.gnu.org/licenses/>. -+ */ -+ -+#define SAFE_READ_THRESHOLD 4 -+#define SAFE_WRITE_THRESHOLD 4 -+#define ALLOW_DMA 1 -+#define ALLOW_CMD23 0 -+#define ALLOW_FAST 1 -+#define USE_BLOCK_IRQ 1 -+ -+#include <linux/delay.h> -+#include <linux/module.h> -+#include <linux/io.h> -+#include <linux/mmc/mmc.h> -+#include <linux/mmc/host.h> -+#include <linux/mmc/sd.h> -+#include <linux/scatterlist.h> -+#include <linux/of_address.h> -+#include <linux/of_irq.h> -+#include <linux/clk.h> -+#include <linux/platform_device.h> -+#include <linux/err.h> -+#include <linux/blkdev.h> -+#include <linux/dmaengine.h> -+#include <linux/dma-mapping.h> -+#include <linux/of_dma.h> -+#include <linux/time.h> -+ -+#define DRIVER_NAME "sdhost-bcm2835" -+ -+#define SDCMD 0x00 /* Command to SD card - 16 R/W */ -+#define SDARG 0x04 /* Argument to SD card - 32 R/W */ -+#define SDTOUT 0x08 /* Start value for timeout counter - 32 R/W */ -+#define SDCDIV 0x0c /* Start value for clock divider - 11 R/W */ -+#define SDRSP0 0x10 /* SD card response (31:0) - 32 R */ -+#define SDRSP1 0x14 /* SD card response (63:32) - 32 R */ -+#define SDRSP2 0x18 /* SD card response (95:64) - 32 R */ -+#define SDRSP3 0x1c /* SD card response (127:96) - 32 R */ -+#define SDHSTS 0x20 /* SD host status - 11 R */ -+#define SDVDD 0x30 /* SD card power control - 1 R/W */ -+#define SDEDM 0x34 /* Emergency Debug Mode - 13 R/W */ -+#define SDHCFG 0x38 /* Host configuration - 2 R/W */ -+#define SDHBCT 0x3c /* Host byte count (debug) - 32 R/W */ -+#define SDDATA 0x40 /* Data to/from SD card - 32 R/W */ -+#define SDHBLC 0x50 /* Host block count (SDIO/SDHC) - 9 R/W */ -+ -+#define SDCMD_NEW_FLAG 0x8000 -+#define SDCMD_FAIL_FLAG 0x4000 -+#define SDCMD_BUSYWAIT 0x800 -+#define SDCMD_NO_RESPONSE 0x400 -+#define SDCMD_LONG_RESPONSE 0x200 -+#define SDCMD_WRITE_CMD 0x80 -+#define SDCMD_READ_CMD 0x40 -+#define SDCMD_CMD_MASK 0x3f -+ -+#define SDCDIV_MAX_CDIV 0x7ff -+ -+#define SDHSTS_BUSY_IRPT 0x400 -+#define SDHSTS_BLOCK_IRPT 0x200 -+#define SDHSTS_SDIO_IRPT 0x100 -+#define SDHSTS_REW_TIME_OUT 0x80 -+#define SDHSTS_CMD_TIME_OUT 0x40 -+#define SDHSTS_CRC16_ERROR 0x20 -+#define SDHSTS_CRC7_ERROR 0x10 -+#define SDHSTS_FIFO_ERROR 0x08 -+/* Reserved */ -+/* Reserved */ -+#define SDHSTS_DATA_FLAG 0x01 -+ -+#define SDHSTS_TRANSFER_ERROR_MASK (SDHSTS_CRC16_ERROR|SDHSTS_REW_TIME_OUT|SDHSTS_FIFO_ERROR) -+#define SDHSTS_ERROR_MASK (SDHSTS_CMD_TIME_OUT|SDHSTS_TRANSFER_ERROR_MASK) -+/* SDHSTS_CRC7_ERROR - ignore this as MMC cards generate this spuriously */ -+ -+#define SDHCFG_BUSY_IRPT_EN (1<<10) -+#define SDHCFG_BLOCK_IRPT_EN (1<<8) -+#define SDHCFG_SDIO_IRPT_EN (1<<5) -+#define SDHCFG_DATA_IRPT_EN (1<<4) -+#define SDHCFG_SLOW_CARD (1<<3) -+#define SDHCFG_WIDE_EXT_BUS (1<<2) -+#define SDHCFG_WIDE_INT_BUS (1<<1) -+#define SDHCFG_REL_CMD_LINE (1<<0) -+ -+#define SDEDM_FORCE_DATA_MODE (1<<19) -+#define SDEDM_CLOCK_PULSE (1<<20) -+#define SDEDM_BYPASS (1<<21) -+ -+#define SDEDM_WRITE_THRESHOLD_SHIFT 9 -+#define SDEDM_READ_THRESHOLD_SHIFT 14 -+#define SDEDM_THRESHOLD_MASK 0x1f -+ -+/* the inclusive limit in bytes under which PIO will be used instead of DMA */ -+#ifdef CONFIG_MMC_BCM2835_SDHOST_PIO_DMA_BARRIER -+#define PIO_DMA_BARRIER CONFIG_MMC_BCM2835_SDHOST_PIO_DMA_BARRIER -+#else -+#define PIO_DMA_BARRIER 0 -+#endif -+ -+#define MIN_FREQ 400000 -+#define TIMEOUT_VAL 0xE -+#define BCM2835_SDHOST_WRITE_DELAY(f) (((2 * 1000000) / f) + 1) -+ -+#ifndef BCM2708_PERI_BASE -+ #define BCM2708_PERI_BASE 0x20000000 -+#endif -+ -+/* FIXME: Needs IOMMU support */ -+#define BCM2835_VCMMU_SHIFT (0x7E000000 - BCM2708_PERI_BASE) -+ -+ -+struct bcm2835_host { -+ spinlock_t lock; -+ -+ void __iomem *ioaddr; -+ u32 phys_addr; -+ -+ struct mmc_host *mmc; -+ -+ u32 timeout; -+ -+ int clock; /* Current clock speed */ -+ -+ bool slow_card; /* Force 11-bit divisor */ -+ -+ unsigned int max_clk; /* Max possible freq */ -+ unsigned int timeout_clk; /* Timeout freq (KHz) */ -+ -+ struct tasklet_struct finish_tasklet; /* Tasklet structures */ -+ -+ struct timer_list timer; /* Timer for timeouts */ -+ -+ struct sg_mapping_iter sg_miter; /* SG state for PIO */ -+ unsigned int blocks; /* remaining PIO blocks */ -+ -+ int irq; /* Device IRQ */ -+ -+ -+ /* cached registers */ -+ u32 hcfg; -+ u32 cdiv; -+ -+ struct mmc_request *mrq; /* Current request */ -+ struct mmc_command *cmd; /* Current command */ -+ struct mmc_data *data; /* Current data request */ -+ unsigned int data_complete:1; /* Data finished before cmd */ -+ -+ unsigned int flush_fifo:1; /* Drain the fifo when finishing */ -+ -+ unsigned int use_busy:1; /* Wait for busy interrupt */ -+ -+ u32 thread_isr; -+ -+ /*DMA part*/ -+ struct dma_chan *dma_chan_rx; /* DMA channel for reads */ -+ struct dma_chan *dma_chan_tx; /* DMA channel for writes */ -+ -+ bool allow_dma; -+ bool have_dma; -+ bool use_dma; -+ /*end of DMA part*/ -+ -+ int max_delay; /* maximum length of time spent waiting */ -+ struct timeval stop_time; /* when the last stop was issued */ -+ u32 delay_after_stop; /* minimum time between stop and subsequent data transfer */ -+ u32 overclock_50; /* frequency to use when 50MHz is requested (in MHz) */ -+ u32 max_overclock; /* Highest reported */ -+}; -+ -+ -+static inline void bcm2835_sdhost_write(struct bcm2835_host *host, u32 val, int reg) -+{ -+ writel(val, host->ioaddr + reg); -+} -+ -+static inline u32 bcm2835_sdhost_read(struct bcm2835_host *host, int reg) -+{ -+ return readl(host->ioaddr + reg); -+} -+ -+static inline u32 bcm2835_sdhost_read_relaxed(struct bcm2835_host *host, int reg) -+{ -+ return readl_relaxed(host->ioaddr + reg); -+} -+ -+static void bcm2835_sdhost_dumpregs(struct bcm2835_host *host) -+{ -+ pr_info(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n", -+ mmc_hostname(host->mmc)); -+ -+ pr_info(DRIVER_NAME ": SDCMD 0x%08x\n", -+ bcm2835_sdhost_read(host, SDCMD)); -+ pr_info(DRIVER_NAME ": SDARG 0x%08x\n", -+ bcm2835_sdhost_read(host, SDARG)); -+ pr_info(DRIVER_NAME ": SDTOUT 0x%08x\n", -+ bcm2835_sdhost_read(host, SDTOUT)); -+ pr_info(DRIVER_NAME ": SDCDIV 0x%08x\n", -+ bcm2835_sdhost_read(host, SDCDIV)); -+ pr_info(DRIVER_NAME ": SDRSP0 0x%08x\n", -+ bcm2835_sdhost_read(host, SDRSP0)); -+ pr_info(DRIVER_NAME ": SDRSP1 0x%08x\n", -+ bcm2835_sdhost_read(host, SDRSP1)); -+ pr_info(DRIVER_NAME ": SDRSP2 0x%08x\n", -+ bcm2835_sdhost_read(host, SDRSP2)); -+ pr_info(DRIVER_NAME ": SDRSP3 0x%08x\n", -+ bcm2835_sdhost_read(host, SDRSP3)); -+ pr_info(DRIVER_NAME ": SDHSTS 0x%08x\n", -+ bcm2835_sdhost_read(host, SDHSTS)); -+ pr_info(DRIVER_NAME ": SDVDD 0x%08x\n", -+ bcm2835_sdhost_read(host, SDVDD)); -+ pr_info(DRIVER_NAME ": SDEDM 0x%08x\n", -+ bcm2835_sdhost_read(host, SDEDM)); -+ pr_info(DRIVER_NAME ": SDHCFG 0x%08x\n", -+ bcm2835_sdhost_read(host, SDHCFG)); -+ pr_info(DRIVER_NAME ": SDHBCT 0x%08x\n", -+ bcm2835_sdhost_read(host, SDHBCT)); -+ pr_info(DRIVER_NAME ": SDHBLC 0x%08x\n", -+ bcm2835_sdhost_read(host, SDHBLC)); -+ -+ pr_debug(DRIVER_NAME ": ===========================================\n"); -+} -+ -+ -+static void bcm2835_sdhost_set_power(struct bcm2835_host *host, bool on) -+{ -+ bcm2835_sdhost_write(host, on ? 1 : 0, SDVDD); -+} -+ -+ -+static void bcm2835_sdhost_reset(struct bcm2835_host *host) -+{ -+ u32 temp; -+ -+ pr_debug("bcm2835_sdhost_reset\n"); -+ -+ bcm2835_sdhost_set_power(host, false); -+ -+ bcm2835_sdhost_write(host, 0, SDCMD); -+ bcm2835_sdhost_write(host, 0, SDARG); -+ bcm2835_sdhost_write(host, 0xf00000, SDTOUT); -+ bcm2835_sdhost_write(host, 0, SDCDIV); -+ bcm2835_sdhost_write(host, 0x7f8, SDHSTS); /* Write 1s to clear */ -+ bcm2835_sdhost_write(host, 0, SDHCFG); -+ bcm2835_sdhost_write(host, 0, SDHBCT); -+ bcm2835_sdhost_write(host, 0, SDHBLC); -+ -+ /* Limit fifo usage due to silicon bug */ -+ temp = bcm2835_sdhost_read(host, SDEDM); -+ temp &= ~((SDEDM_THRESHOLD_MASK<<SDEDM_READ_THRESHOLD_SHIFT) | -+ (SDEDM_THRESHOLD_MASK<<SDEDM_WRITE_THRESHOLD_SHIFT)); -+ temp |= (SAFE_READ_THRESHOLD << SDEDM_READ_THRESHOLD_SHIFT) | -+ (SAFE_WRITE_THRESHOLD << SDEDM_WRITE_THRESHOLD_SHIFT); -+ bcm2835_sdhost_write(host, temp, SDEDM); -+ mdelay(10); -+ bcm2835_sdhost_set_power(host, true); -+ mdelay(10); -+ host->clock = 0; -+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG); -+ bcm2835_sdhost_write(host, host->cdiv, SDCDIV); -+ mmiowb(); -+} -+ -+static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios); -+ -+static void bcm2835_sdhost_init(struct bcm2835_host *host, int soft) -+{ -+ pr_debug("bcm2835_sdhost_init(%d)\n", soft); -+ -+ /* Set interrupt enables */ -+ host->hcfg = SDHCFG_BUSY_IRPT_EN; -+ -+ bcm2835_sdhost_reset(host); -+ -+ if (soft) { -+ /* force clock reconfiguration */ -+ host->clock = 0; -+ bcm2835_sdhost_set_ios(host->mmc, &host->mmc->ios); -+ } -+} -+ -+static bool bcm2835_sdhost_is_write_complete(struct bcm2835_host *host) -+{ -+ bool write_complete = ((bcm2835_sdhost_read(host, SDEDM) & 0xf) == 1); -+ -+ if (!write_complete) { -+ /* Request an IRQ for the last block */ -+ host->hcfg |= SDHCFG_BLOCK_IRPT_EN; -+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG); -+ if ((bcm2835_sdhost_read(host, SDEDM) & 0xf) == 1) { -+ /* The write has now completed. Disable the interrupt -+ and clear the status flag */ -+ host->hcfg &= ~SDHCFG_BLOCK_IRPT_EN; -+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG); -+ bcm2835_sdhost_write(host, SDHSTS_BLOCK_IRPT, SDHSTS); -+ write_complete = true; -+ } -+ } -+ -+ return write_complete; -+} -+ -+static void bcm2835_sdhost_wait_write_complete(struct bcm2835_host *host) -+{ -+ int timediff; -+#ifdef DEBUG -+ static struct timeval start_time; -+ static int max_stall_time = 0; -+ static int total_stall_time = 0; -+ struct timeval before, after; -+ -+ do_gettimeofday(&before); -+ if (max_stall_time == 0) -+ start_time = before; -+#endif -+ -+ timediff = 0; -+ -+ while (1) { -+ u32 edm = bcm2835_sdhost_read(host, SDEDM); -+ if ((edm & 0xf) == 1) -+ break; -+ timediff++; -+ if (timediff > 5000000) { -+#ifdef DEBUG -+ do_gettimeofday(&after); -+ timediff = (after.tv_sec - before.tv_sec)*1000000 + -+ (after.tv_usec - before.tv_usec); -+ -+ pr_err(" wait_write_complete - still waiting after %dus\n", -+ timediff); -+#else -+ pr_err(" wait_write_complete - still waiting after %d retries\n", -+ timediff); -+#endif -+ bcm2835_sdhost_dumpregs(host); -+ host->data->error = -ETIMEDOUT; -+ return; -+ } -+ } -+ -+#ifdef DEBUG -+ do_gettimeofday(&after); -+ timediff = (after.tv_sec - before.tv_sec)*1000000 + (after.tv_usec - before.tv_usec); -+ -+ total_stall_time += timediff; -+ if (timediff > max_stall_time) -+ max_stall_time = timediff; -+ -+ if ((after.tv_sec - start_time.tv_sec) > 10) { -+ pr_debug(" wait_write_complete - max wait %dus, total %dus\n", -+ max_stall_time, total_stall_time); -+ start_time = after; -+ max_stall_time = 0; -+ total_stall_time = 0; -+ } -+#endif -+} -+ -+static void bcm2835_sdhost_finish_data(struct bcm2835_host *host); -+ -+static void bcm2835_sdhost_dma_complete(void *param) -+{ -+ struct bcm2835_host *host = param; -+ struct dma_chan *dma_chan; -+ unsigned long flags; -+ u32 dir_data; -+ -+ spin_lock_irqsave(&host->lock, flags); -+ -+ if (host->data) { -+ bool write_complete; -+ if (USE_BLOCK_IRQ) -+ write_complete = bcm2835_sdhost_is_write_complete(host); -+ else { -+ bcm2835_sdhost_wait_write_complete(host); -+ write_complete = true; -+ } -+ pr_debug("dma_complete() - write_complete=%d\n", -+ write_complete); -+ -+ if (write_complete || (host->data->flags & MMC_DATA_READ)) -+ { -+ if (write_complete) { -+ dma_chan = host->dma_chan_tx; -+ dir_data = DMA_TO_DEVICE; -+ } else { -+ dma_chan = host->dma_chan_rx; -+ dir_data = DMA_FROM_DEVICE; -+ } -+ -+ dma_unmap_sg(dma_chan->device->dev, -+ host->data->sg, host->data->sg_len, -+ dir_data); -+ -+ bcm2835_sdhost_finish_data(host); -+ } -+ } -+ -+ spin_unlock_irqrestore(&host->lock, flags); -+} -+ -+static void bcm2835_sdhost_read_block_pio(struct bcm2835_host *host) -+{ -+ unsigned long flags; -+ size_t blksize, len; -+ u32 *buf; -+ -+ blksize = host->data->blksz; -+ -+ local_irq_save(flags); -+ -+ while (blksize) { -+ if (!sg_miter_next(&host->sg_miter)) -+ BUG(); -+ -+ len = min(host->sg_miter.length, blksize); -+ BUG_ON(len % 4); -+ -+ blksize -= len; -+ host->sg_miter.consumed = len; -+ -+ buf = (u32 *)host->sg_miter.addr; -+ -+ while (len) { -+ while (1) { -+ u32 hsts; -+ hsts = bcm2835_sdhost_read(host, SDHSTS); -+ if (hsts & SDHSTS_DATA_FLAG) -+ break; -+ -+ if (hsts & SDHSTS_ERROR_MASK) { -+ pr_err("%s: Transfer error - HSTS %x, HBCT %x - %x left\n", -+ mmc_hostname(host->mmc), -+ hsts, -+ bcm2835_sdhost_read(host, SDHBCT), -+ blksize + len); -+ if (hsts & SDHSTS_REW_TIME_OUT) -+ host->data->error = -ETIMEDOUT; -+ else if (hsts & (SDHSTS_CRC16_ERROR || -+ SDHSTS_CRC7_ERROR)) -+ host->data->error = -EILSEQ; -+ else { -+ pr_err("%s: unexpected data error\n", -+ mmc_hostname(host->mmc)); -+ bcm2835_sdhost_dumpregs(host); -+ host->cmd->error = -EIO; -+ } -+ } -+ } -+ -+ *(buf++) = bcm2835_sdhost_read(host, SDDATA); -+ len -= 4; -+ } -+ } -+ -+ sg_miter_stop(&host->sg_miter); -+ -+ local_irq_restore(flags); -+} -+ -+static void bcm2835_sdhost_write_block_pio(struct bcm2835_host *host) -+{ -+ unsigned long flags; -+ size_t blksize, len; -+ u32 *buf; -+ -+ blksize = host->data->blksz; -+ -+ local_irq_save(flags); -+ -+ while (blksize) { -+ if (!sg_miter_next(&host->sg_miter)) -+ BUG(); -+ -+ len = min(host->sg_miter.length, blksize); -+ BUG_ON(len % 4); -+ -+ blksize -= len; -+ host->sg_miter.consumed = len; -+ -+ buf = host->sg_miter.addr; -+ -+ while (len) { -+ while (!(bcm2835_sdhost_read(host, SDHSTS) & SDHSTS_DATA_FLAG)) -+ continue; -+ bcm2835_sdhost_write(host, *(buf++), SDDATA); -+ len -= 4; -+ } -+ } -+ -+ sg_miter_stop(&host->sg_miter); -+ -+ local_irq_restore(flags); -+} -+ -+ -+static void bcm2835_sdhost_transfer_pio(struct bcm2835_host *host) -+{ -+ BUG_ON(!host->data); -+ -+ if (host->data->flags & MMC_DATA_READ) -+ bcm2835_sdhost_read_block_pio(host); -+ else -+ bcm2835_sdhost_write_block_pio(host); -+} -+ -+ -+static void bcm2835_sdhost_transfer_dma(struct bcm2835_host *host) -+{ -+ u32 len, dir_data, dir_slave; -+ struct dma_async_tx_descriptor *desc = NULL; -+ struct dma_chan *dma_chan; -+ -+ pr_debug("bcm2835_sdhost_transfer_dma()\n"); -+ -+ WARN_ON(!host->data); -+ -+ if (!host->data) -+ return; -+ -+ if (host->data->flags & MMC_DATA_READ) { -+ dma_chan = host->dma_chan_rx; -+ dir_data = DMA_FROM_DEVICE; -+ dir_slave = DMA_DEV_TO_MEM; -+ } else { -+ dma_chan = host->dma_chan_tx; -+ dir_data = DMA_TO_DEVICE; -+ dir_slave = DMA_MEM_TO_DEV; -+ } -+ -+ BUG_ON(!dma_chan->device); -+ BUG_ON(!dma_chan->device->dev); -+ BUG_ON(!host->data->sg); -+ -+ len = dma_map_sg(dma_chan->device->dev, host->data->sg, -+ host->data->sg_len, dir_data); -+ if (len > 0) { -+ desc = dmaengine_prep_slave_sg(dma_chan, host->data->sg, -+ len, dir_slave, -+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK); -+ } else { -+ dev_err(mmc_dev(host->mmc), "dma_map_sg returned zero length\n"); -+ } -+ if (desc) { -+ desc->callback = bcm2835_sdhost_dma_complete; -+ desc->callback_param = host; -+ dmaengine_submit(desc); -+ dma_async_issue_pending(dma_chan); -+ } -+ -+} -+ -+ -+static void bcm2835_sdhost_set_transfer_irqs(struct bcm2835_host *host) -+{ -+ u32 all_irqs = SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN | -+ SDHCFG_BUSY_IRPT_EN; -+ if (host->use_dma) -+ host->hcfg = (host->hcfg & ~all_irqs) | -+ SDHCFG_BUSY_IRPT_EN; -+ else -+ host->hcfg = (host->hcfg & ~all_irqs) | -+ SDHCFG_DATA_IRPT_EN | -+ SDHCFG_BUSY_IRPT_EN; -+ -+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG); -+} -+ -+ -+static void bcm2835_sdhost_prepare_data(struct bcm2835_host *host, struct mmc_command *cmd) -+{ -+ struct mmc_data *data = cmd->data; -+ -+ WARN_ON(host->data); -+ -+ if (!data) -+ return; -+ -+ /* Sanity checks */ -+ BUG_ON(data->blksz * data->blocks > 524288); -+ BUG_ON(data->blksz > host->mmc->max_blk_size); -+ BUG_ON(data->blocks > 65535); -+ -+ host->data = data; -+ host->data_complete = 0; -+ host->flush_fifo = 0; -+ host->data->bytes_xfered = 0; -+ -+ if (!host->use_dma) { -+ int flags; -+ -+ flags = SG_MITER_ATOMIC; -+ if (data->flags & MMC_DATA_READ) -+ flags |= SG_MITER_TO_SG; -+ else -+ flags |= SG_MITER_FROM_SG; -+ sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); -+ host->blocks = data->blocks; -+ } -+ -+ host->use_dma = host->have_dma && data->blocks > PIO_DMA_BARRIER; -+ -+ bcm2835_sdhost_set_transfer_irqs(host); -+ -+ bcm2835_sdhost_write(host, data->blksz, SDHBCT); -+ if (host->use_dma) -+ bcm2835_sdhost_write(host, data->blocks, SDHBLC); -+ -+ BUG_ON(!host->data); -+} -+ -+ -+void bcm2835_sdhost_send_command(struct bcm2835_host *host, struct mmc_command *cmd) -+{ -+ u32 sdcmd; -+ unsigned long timeout; -+ -+ WARN_ON(host->cmd); -+ -+ if (1) { -+ pr_debug("bcm2835_sdhost_send_command: %08x %08x (flags %x)\n", -+ cmd->opcode, cmd->arg, (cmd->flags & 0xff) | (cmd->data ? cmd->data->flags : 0)); -+ if (cmd->data) -+ pr_debug("bcm2835_sdhost_send_command: %s %d*%x\n", -+ (cmd->data->flags & MMC_DATA_READ) ? -+ "read" : "write", cmd->data->blocks, -+ cmd->data->blksz); -+ } -+ -+ /* Wait max 10 ms */ -+ timeout = 1000; -+ -+ while (bcm2835_sdhost_read(host, SDCMD) & SDCMD_NEW_FLAG) { -+ if (timeout == 0) { -+ pr_err("%s: Previous command never completed.\n", -+ mmc_hostname(host->mmc)); -+ bcm2835_sdhost_dumpregs(host); -+ cmd->error = -EIO; -+ tasklet_schedule(&host->finish_tasklet); -+ return; -+ } -+ timeout--; -+ udelay(10); -+ } -+ -+ if ((1000-timeout)/100 > 1 && (1000-timeout)/100 > host->max_delay) { -+ host->max_delay = (1000-timeout)/100; -+ pr_warning("Warning: SDHost controller hung for %d ms\n", host->max_delay); -+ } -+ -+ timeout = jiffies; -+#ifdef CONFIG_ARCH_BCM2835 -+ if (!cmd->data && cmd->busy_timeout > 9000) -+ timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ; -+ else -+#endif -+ timeout += 10 * HZ; -+ mod_timer(&host->timer, timeout); -+ -+ host->cmd = cmd; -+ -+ bcm2835_sdhost_prepare_data(host, cmd); -+ -+ bcm2835_sdhost_write(host, cmd->arg, SDARG); -+ -+ if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) { -+ pr_err("%s: Unsupported response type!\n", -+ mmc_hostname(host->mmc)); -+ cmd->error = -EINVAL; -+ tasklet_schedule(&host->finish_tasklet); -+ return; -+ } -+ -+ sdcmd = cmd->opcode & SDCMD_CMD_MASK; -+ -+ if (!(cmd->flags & MMC_RSP_PRESENT)) -+ sdcmd |= SDCMD_NO_RESPONSE; -+ else { -+ if (cmd->flags & MMC_RSP_136) -+ sdcmd |= SDCMD_LONG_RESPONSE; -+ if (cmd->flags & MMC_RSP_BUSY) { -+ sdcmd |= SDCMD_BUSYWAIT; -+ host->use_busy = 1; -+ } -+ } -+ -+ if (cmd->data) { -+ if (host->delay_after_stop) { -+ struct timeval now; -+ int time_since_stop; -+ do_gettimeofday(&now); -+ time_since_stop = (now.tv_sec - host->stop_time.tv_sec); -+ if (time_since_stop < 2) { -+ /* Possibly less than one second */ -+ time_since_stop = time_since_stop * 1000000 + -+ (now.tv_usec - host->stop_time.tv_usec); -+ if (time_since_stop < host->delay_after_stop) -+ udelay(host->delay_after_stop - -+ time_since_stop); -+ } -+ } -+ -+ if (cmd->data->flags & MMC_DATA_WRITE) -+ sdcmd |= SDCMD_WRITE_CMD; -+ if (cmd->data->flags & MMC_DATA_READ) -+ sdcmd |= SDCMD_READ_CMD; -+ } -+ -+ bcm2835_sdhost_write(host, sdcmd | SDCMD_NEW_FLAG, SDCMD); -+} -+ -+ -+static void bcm2835_sdhost_finish_command(struct bcm2835_host *host); -+static void bcm2835_sdhost_transfer_complete(struct bcm2835_host *host); -+ -+static void bcm2835_sdhost_finish_data(struct bcm2835_host *host) -+{ -+ struct mmc_data *data; -+ -+ data = host->data; -+ BUG_ON(!data); -+ -+ pr_debug("finish_data(error %d, stop %d, sbc %d)\n", -+ data->error, data->stop ? 1 : 0, -+ host->mrq->sbc ? 1 : 0); -+ -+ host->hcfg &= ~(SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN); -+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG); -+ -+ if (data->error) { -+ data->bytes_xfered = 0; -+ } else -+ data->bytes_xfered = data->blksz * data->blocks; -+ -+ host->data_complete = 1; -+ -+ if (host->cmd) { -+ /* -+ * Data managed to finish before the -+ * command completed. Make sure we do -+ * things in the proper order. -+ */ -+ pr_debug("Finished early - HSTS %x\n", -+ bcm2835_sdhost_read(host, SDHSTS)); -+ } -+ else -+ bcm2835_sdhost_transfer_complete(host); -+} -+ -+ -+static void bcm2835_sdhost_transfer_complete(struct bcm2835_host *host) -+{ -+ struct mmc_data *data; -+ -+ BUG_ON(host->cmd); -+ BUG_ON(!host->data); -+ BUG_ON(!host->data_complete); -+ -+ data = host->data; -+ host->data = NULL; -+ -+ pr_debug("transfer_complete(error %d, stop %d)\n", -+ data->error, data->stop ? 1 : 0); -+ -+ if (data->error) -+ /* -+ * The controller needs a reset of internal state machines -+ * upon error conditions. -+ */ -+ bcm2835_sdhost_reset(host); -+ -+ /* -+ * Need to send CMD12 if - -+ * a) open-ended multiblock transfer (no CMD23) -+ * b) error in multiblock transfer -+ */ -+ if (data->stop && -+ (data->error || -+ !host->mrq->sbc)) { -+ host->flush_fifo = 1; -+ bcm2835_sdhost_send_command(host, data->stop); -+ if (host->delay_after_stop) -+ do_gettimeofday(&host->stop_time); -+ if (!host->use_busy) -+ bcm2835_sdhost_finish_command(host); -+ } else { -+ tasklet_schedule(&host->finish_tasklet); -+ } -+} -+ -+static void bcm2835_sdhost_finish_command(struct bcm2835_host *host) -+{ -+ u32 sdcmd; -+ int timeout = 1000; -+#ifdef DEBUG -+ struct timeval before, after; -+ int timediff = 0; -+#endif -+ -+ pr_debug("finish_command(%x)\n", bcm2835_sdhost_read(host, SDCMD)); -+ -+ BUG_ON(!host->cmd || !host->mrq); -+ -+#ifdef DEBUG -+ do_gettimeofday(&before); -+#endif -+ for (sdcmd = bcm2835_sdhost_read(host, SDCMD); -+ (sdcmd & SDCMD_NEW_FLAG) && timeout; -+ timeout--) { -+ if (host->flush_fifo) { -+ while (bcm2835_sdhost_read(host, SDHSTS) & -+ SDHSTS_DATA_FLAG) -+ (void)bcm2835_sdhost_read(host, SDDATA); -+ } -+ udelay(10); -+ sdcmd = bcm2835_sdhost_read(host, SDCMD); -+ } -+#ifdef DEBUG -+ do_gettimeofday(&after); -+ timediff = (after.tv_sec - before.tv_sec)*1000000 + -+ (after.tv_usec - before.tv_usec); -+ -+ pr_debug(" finish_command - waited %dus\n", timediff); -+#endif -+ -+ if (timeout == 0) { -+ pr_err("%s: Command never completed.\n", -+ mmc_hostname(host->mmc)); -+ bcm2835_sdhost_dumpregs(host); -+ host->cmd->error = -EIO; -+ tasklet_schedule(&host->finish_tasklet); -+ return; -+ } -+ -+ if (host->flush_fifo) { -+ for (timeout = 100; -+ (bcm2835_sdhost_read(host, SDHSTS) & SDHSTS_DATA_FLAG) && timeout; -+ timeout--) { -+ (void)bcm2835_sdhost_read(host, SDDATA); -+ } -+ host->flush_fifo = 0; -+ if (timeout == 0) { -+ pr_err("%s: FIFO never drained.\n", -+ mmc_hostname(host->mmc)); -+ bcm2835_sdhost_dumpregs(host); -+ host->cmd->error = -EIO; -+ tasklet_schedule(&host->finish_tasklet); -+ return; -+ } -+ } -+ -+ /* Check for errors */ -+ if (sdcmd & SDCMD_FAIL_FLAG) -+ { -+ u32 sdhsts = bcm2835_sdhost_read(host, SDHSTS); -+ -+ pr_debug("%s: error detected - CMD %x, HSTS %03x, EDM %x\n", -+ mmc_hostname(host->mmc), sdcmd, sdhsts, -+ bcm2835_sdhost_read(host, SDEDM)); -+ -+ if (sdhsts & SDHSTS_CMD_TIME_OUT) -+ host->cmd->error = -ETIMEDOUT; -+ else -+ { -+ pr_err("%s: unexpected command error\n", -+ mmc_hostname(host->mmc)); -+ bcm2835_sdhost_dumpregs(host); -+ host->cmd->error = -EIO; -+ } -+ tasklet_schedule(&host->finish_tasklet); -+ return; -+ } -+ -+ if (host->cmd->flags & MMC_RSP_PRESENT) { -+ if (host->cmd->flags & MMC_RSP_136) { -+ int i; -+ for (i = 0; i < 4; i++) -+ host->cmd->resp[3 - i] = bcm2835_sdhost_read(host, SDRSP0 + i*4); -+ pr_debug("bcm2835_sdhost_finish_command: %08x %08x %08x %08x\n", -+ host->cmd->resp[0], host->cmd->resp[1], host->cmd->resp[2], host->cmd->resp[3]); -+ } else { -+ host->cmd->resp[0] = bcm2835_sdhost_read(host, SDRSP0); -+ pr_debug("bcm2835_sdhost_finish_command: %08x\n", -+ host->cmd->resp[0]); -+ } -+ } -+ -+ host->cmd->error = 0; -+ -+ if (host->cmd == host->mrq->sbc) { -+ /* Finished CMD23, now send actual command. */ -+ host->cmd = NULL; -+ bcm2835_sdhost_send_command(host, host->mrq->cmd); -+ -+ if (host->cmd->data && host->use_dma) -+ /* DMA transfer starts now, PIO starts after irq */ -+ bcm2835_sdhost_transfer_dma(host); -+ -+ if (!host->use_busy) -+ bcm2835_sdhost_finish_command(host); -+ } else if (host->cmd == host->mrq->stop) -+ /* Finished CMD12 */ -+ tasklet_schedule(&host->finish_tasklet); -+ else { -+ /* Processed actual command. */ -+ host->cmd = NULL; -+ if (!host->data) -+ tasklet_schedule(&host->finish_tasklet); -+ else if (host->data_complete) -+ bcm2835_sdhost_transfer_complete(host); -+ } -+} -+ -+static void bcm2835_sdhost_timeout_timer(unsigned long data) -+{ -+ struct bcm2835_host *host; -+ unsigned long flags; -+ -+ host = (struct bcm2835_host *)data; -+ -+ spin_lock_irqsave(&host->lock, flags); -+ -+ if (host->mrq) { -+ pr_err("%s: Timeout waiting for hardware interrupt.\n", -+ mmc_hostname(host->mmc)); -+ bcm2835_sdhost_dumpregs(host); -+ -+ if (host->data) { -+ host->data->error = -ETIMEDOUT; -+ bcm2835_sdhost_finish_data(host); -+ } else { -+ if (host->cmd) -+ host->cmd->error = -ETIMEDOUT; -+ else -+ host->mrq->cmd->error = -ETIMEDOUT; -+ -+ pr_debug("timeout_timer tasklet_schedule\n"); -+ tasklet_schedule(&host->finish_tasklet); -+ } -+ } -+ -+ mmiowb(); -+ spin_unlock_irqrestore(&host->lock, flags); -+} -+ -+static void bcm2835_sdhost_enable_sdio_irq_nolock(struct bcm2835_host *host, int enable) -+{ -+ if (enable) -+ host->hcfg |= SDHCFG_SDIO_IRPT_EN; -+ else -+ host->hcfg &= ~SDHCFG_SDIO_IRPT_EN; -+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG); -+ mmiowb(); -+} -+ -+static void bcm2835_sdhost_enable_sdio_irq(struct mmc_host *mmc, int enable) -+{ -+ struct bcm2835_host *host = mmc_priv(mmc); -+ unsigned long flags; -+ -+ pr_debug("bcm2835_sdhost_enable_sdio_irq(%d)\n", enable); -+ spin_lock_irqsave(&host->lock, flags); -+ bcm2835_sdhost_enable_sdio_irq_nolock(host, enable); -+ spin_unlock_irqrestore(&host->lock, flags); -+} -+ -+static u32 bcm2835_sdhost_busy_irq(struct bcm2835_host *host, u32 intmask) -+{ -+ const u32 handled = (SDHSTS_CMD_TIME_OUT | SDHSTS_CRC16_ERROR | -+ SDHSTS_CRC7_ERROR | SDHSTS_FIFO_ERROR); -+ -+ if (!host->cmd) { -+ pr_err("%s: Got command busy interrupt 0x%08x even " -+ "though no command operation was in progress.\n", -+ mmc_hostname(host->mmc), (unsigned)intmask); -+ bcm2835_sdhost_dumpregs(host); -+ return 0; -+ } -+ -+ if (!host->use_busy) { -+ pr_err("%s: Got command busy interrupt 0x%08x even " -+ "though not expecting one.\n", -+ mmc_hostname(host->mmc), (unsigned)intmask); -+ bcm2835_sdhost_dumpregs(host); -+ return 0; -+ } -+ host->use_busy = 0; -+ -+ if (intmask & SDHSTS_CMD_TIME_OUT) -+ host->cmd->error = -ETIMEDOUT; -+ else if (intmask & (SDHSTS_CRC16_ERROR | SDHSTS_CRC7_ERROR | -+ SDHSTS_FIFO_ERROR)) -+ host->cmd->error = -EILSEQ; -+ -+ if (host->cmd->error) -+ tasklet_schedule(&host->finish_tasklet); -+ else -+ bcm2835_sdhost_finish_command(host); -+ -+ return handled; -+} -+ -+static u32 bcm2835_sdhost_data_irq(struct bcm2835_host *host, u32 intmask) -+{ -+ const u32 handled = (SDHSTS_CMD_TIME_OUT | SDHSTS_CRC16_ERROR | -+ SDHSTS_CRC7_ERROR | SDHSTS_FIFO_ERROR); -+ -+ /* There are no dedicated data/space available interrupt -+ status bits, so it is necessary to use the single shared -+ data/space available FIFO status bits. It is therefore not -+ an error to get here when there is no data transfer in -+ progress. */ -+ if (!host->data) -+ return 0; -+ -+ // XXX FIFO_ERROR -+ if (intmask & SDHSTS_CMD_TIME_OUT) -+ host->cmd->error = -ETIMEDOUT; -+ else if ((intmask & (SDHSTS_CRC16_ERROR | SDHSTS_CRC7_ERROR)) && -+ ((bcm2835_sdhost_read(host, SDCMD) & SDCMD_CMD_MASK) -+ != MMC_BUS_TEST_R)) -+ host->cmd->error = -EILSEQ; -+ -+ /* Use the block interrupt for writes after the first block */ -+ if (host->data->flags & MMC_DATA_WRITE) { -+ host->hcfg &= ~(SDHCFG_DATA_IRPT_EN); -+ host->hcfg |= SDHCFG_BLOCK_IRPT_EN; -+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG); -+ if (host->data->error) -+ bcm2835_sdhost_finish_data(host); -+ else -+ bcm2835_sdhost_transfer_pio(host); -+ } else { -+ if (!host->data->error) { -+ bcm2835_sdhost_transfer_pio(host); -+ host->blocks--; -+ } -+ if ((host->blocks == 0) || host->data->error) -+ bcm2835_sdhost_finish_data(host); -+ } -+ -+ return handled; -+} -+ -+static u32 bcm2835_sdhost_block_irq(struct bcm2835_host *host, u32 intmask) -+{ -+ struct dma_chan *dma_chan; -+ u32 dir_data; -+ const u32 handled = (SDHSTS_CMD_TIME_OUT | SDHSTS_CRC16_ERROR | -+ SDHSTS_CRC7_ERROR | SDHSTS_FIFO_ERROR); -+ -+ if (!host->data) { -+ pr_err("%s: Got block interrupt 0x%08x even " -+ "though no data operation was in progress.\n", -+ mmc_hostname(host->mmc), (unsigned)intmask); -+ bcm2835_sdhost_dumpregs(host); -+ return handled; -+ } -+ -+ if (intmask & SDHSTS_CMD_TIME_OUT) -+ host->cmd->error = -ETIMEDOUT; -+ else if ((intmask & (SDHSTS_CRC16_ERROR | SDHSTS_CRC7_ERROR)) && -+ ((bcm2835_sdhost_read(host, SDCMD) & SDCMD_CMD_MASK) -+ != MMC_BUS_TEST_R)) -+ host->cmd->error = -EILSEQ; -+ -+ if (!host->use_dma) { -+ BUG_ON(!host->blocks); -+ host->blocks--; -+ if ((host->blocks == 0) || host->data->error) -+ bcm2835_sdhost_finish_data(host); -+ else -+ bcm2835_sdhost_transfer_pio(host); -+ } else if (host->data->flags & MMC_DATA_WRITE) { -+ dma_chan = host->dma_chan_tx; -+ dir_data = DMA_TO_DEVICE; -+ dma_unmap_sg(dma_chan->device->dev, -+ host->data->sg, host->data->sg_len, -+ dir_data); -+ -+ bcm2835_sdhost_finish_data(host); -+ } -+ -+ return handled; -+} -+ -+ -+static irqreturn_t bcm2835_sdhost_irq(int irq, void *dev_id) -+{ -+ irqreturn_t result = IRQ_NONE; -+ struct bcm2835_host *host = dev_id; -+ u32 unexpected = 0, early = 0; -+ int loops = 0; -+#ifndef CONFIG_ARCH_BCM2835 -+ int cardint = 0; -+#endif -+ spin_lock(&host->lock); -+ -+ for (loops = 0; loops < 1; loops++) { -+ u32 intmask, handled; -+ -+ intmask = bcm2835_sdhost_read(host, SDHSTS); -+ handled = intmask & (SDHSTS_BUSY_IRPT | -+ SDHSTS_BLOCK_IRPT | -+ SDHSTS_SDIO_IRPT | -+ SDHSTS_DATA_FLAG); -+ if ((handled == SDHSTS_DATA_FLAG) && // XXX -+ (loops == 0) && !host->data) { -+ pr_err("%s: sdhost_irq data interrupt 0x%08x even " -+ "though no data operation was in progress.\n", -+ mmc_hostname(host->mmc), -+ (unsigned)intmask); -+ -+ bcm2835_sdhost_dumpregs(host); -+ } -+ -+ if (!handled) -+ break; -+ -+ if (loops) -+ early |= handled; -+ -+ result = IRQ_HANDLED; -+ -+ /* Clear all interrupts and notifications */ -+ bcm2835_sdhost_write(host, intmask, SDHSTS); -+ -+ if (intmask & SDHSTS_BUSY_IRPT) -+ handled |= bcm2835_sdhost_busy_irq(host, intmask); -+ -+ /* There is no true data interrupt status bit, so it is -+ necessary to qualify the data flag with the interrupt -+ enable bit */ -+ if ((intmask & SDHSTS_DATA_FLAG) && -+ (host->hcfg & SDHCFG_DATA_IRPT_EN)) -+ handled |= bcm2835_sdhost_data_irq(host, intmask); -+ -+ if (intmask & SDHSTS_BLOCK_IRPT) -+ handled |= bcm2835_sdhost_block_irq(host, intmask); -+ -+ if (intmask & SDHSTS_SDIO_IRPT) { -+#ifndef CONFIG_ARCH_BCM2835 -+ cardint = 1; -+#else -+ bcm2835_sdhost_enable_sdio_irq_nolock(host, false); -+ host->thread_isr |= SDHSTS_SDIO_IRPT; -+ result = IRQ_WAKE_THREAD; -+#endif -+ } -+ -+ unexpected |= (intmask & ~handled); -+ } -+ -+ mmiowb(); -+ -+ spin_unlock(&host->lock); -+ -+ if (early) -+ pr_debug("%s: early %x (loops %d)\n", mmc_hostname(host->mmc), early, loops); -+ -+ if (unexpected) { -+ pr_err("%s: Unexpected interrupt 0x%08x.\n", -+ mmc_hostname(host->mmc), unexpected); -+ bcm2835_sdhost_dumpregs(host); -+ } -+ -+#ifndef CONFIG_ARCH_BCM2835 -+ if (cardint) -+ mmc_signal_sdio_irq(host->mmc); -+#endif -+ -+ return result; -+} -+ -+#ifdef CONFIG_ARCH_BCM2835 -+static irqreturn_t bcm2835_sdhost_thread_irq(int irq, void *dev_id) -+{ -+ struct bcm2835_host *host = dev_id; -+ unsigned long flags; -+ u32 isr; -+ -+ spin_lock_irqsave(&host->lock, flags); -+ isr = host->thread_isr; -+ host->thread_isr = 0; -+ spin_unlock_irqrestore(&host->lock, flags); -+ -+ if (isr & SDHSTS_SDIO_IRPT) { -+ sdio_run_irqs(host->mmc); -+ -+/* Is this necessary? Why re-enable an interrupt which is enabled? -+ spin_lock_irqsave(&host->lock, flags); -+ if (host->flags & SDHSTS_SDIO_IRPT_ENABLED) -+ bcm2835_sdhost_enable_sdio_irq_nolock(host, true); -+ spin_unlock_irqrestore(&host->lock, flags); -+*/ -+ } -+ -+ return isr ? IRQ_HANDLED : IRQ_NONE; -+} -+#endif -+ -+ -+ -+void bcm2835_sdhost_set_clock(struct bcm2835_host *host, unsigned int clock) -+{ -+ int div = 0; /* Initialized for compiler warning */ -+ unsigned int input_clock = clock; -+ -+ if (host->overclock_50 && (clock == 50000000)) -+ clock = host->overclock_50 * 1000000 + 999999; -+ -+ /* The SDCDIV register has 11 bits, and holds (div - 2). -+ But in data mode the max is 50MHz wihout a minimum, and only the -+ bottom 3 bits are used. Since the switch over is automatic (unless -+ we have marked the card as slow...), chosen values have to make -+ sense in both modes. -+ Ident mode must be 100-400KHz, so can range check the requested -+ clock. CMD15 must be used to return to data mode, so this can be -+ monitored. -+ -+ clock 250MHz -> 0->125MHz, 1->83.3MHz, 2->62.5MHz, 3->50.0MHz -+ 4->41.7MHz, 5->35.7MHz, 6->31.3MHz, 7->27.8MHz -+ -+ 623->400KHz/27.8MHz -+ reset value (507)->491159/50MHz -+ -+ BUT, the 3-bit clock divisor in data mode is too small if the -+ core clock is higher than 250MHz, so instead use the SLOW_CARD -+ configuration bit to force the use of the ident clock divisor -+ at all times. -+ */ -+ -+ host->mmc->actual_clock = 0; -+ -+ if (clock < 100000) { -+ /* Can't stop the clock, but make it as slow as possible -+ * to show willing -+ */ -+ host->cdiv = SDCDIV_MAX_CDIV; -+ bcm2835_sdhost_write(host, host->cdiv, SDCDIV); -+ return; -+ } -+ -+ div = host->max_clk / clock; -+ if (div < 2) -+ div = 2; -+ if ((host->max_clk / div) > clock) -+ div++; -+ div -= 2; -+ -+ if (div > SDCDIV_MAX_CDIV) -+ div = SDCDIV_MAX_CDIV; -+ -+ clock = host->max_clk / (div + 2); -+ host->mmc->actual_clock = clock; -+ -+ if ((clock > input_clock) && (clock > host->max_overclock)) { -+ pr_warn("%s: Overclocking to %dHz\n", -+ mmc_hostname(host->mmc), clock); -+ host->max_overclock = clock; -+ } -+ -+ host->cdiv = div; -+ bcm2835_sdhost_write(host, host->cdiv, SDCDIV); -+ -+ pr_debug(DRIVER_NAME ": clock=%d -> max_clk=%d, cdiv=%x (actual clock %d)\n", -+ input_clock, host->max_clk, host->cdiv, host->mmc->actual_clock); -+} -+ -+static void bcm2835_sdhost_request(struct mmc_host *mmc, struct mmc_request *mrq) -+{ -+ struct bcm2835_host *host; -+ unsigned long flags; -+ -+ if (1) { -+ struct mmc_command *cmd = mrq->cmd; -+ const char *src = "cmd"; -+ BUG_ON(!cmd); -+ pr_debug("bcm2835_sdhost_request: %s %08x %08x (flags %x)\n", -+ src, cmd->opcode, cmd->arg, cmd->flags); -+ if (cmd->data) -+ pr_debug("bcm2835_sdhost_request: %s %d*%d\n", -+ (cmd->data->flags & MMC_DATA_READ) ? -+ "read" : "write", cmd->data->blocks, -+ cmd->data->blksz); -+ } -+ -+ if (mrq->data && !is_power_of_2(mrq->data->blksz)) { -+ pr_err("%s: Unsupported block size (%d bytes)\n", -+ mmc_hostname(mmc), mrq->data->blksz); -+ mrq->cmd->error = -EINVAL; -+ mmc_request_done(mmc, mrq); -+ return; -+ } -+ -+ host = mmc_priv(mmc); -+ -+ spin_lock_irqsave(&host->lock, flags); -+ -+ WARN_ON(host->mrq != NULL); -+ -+ host->mrq = mrq; -+ -+ if (mrq->sbc) -+ bcm2835_sdhost_send_command(host, mrq->sbc); -+ else -+ bcm2835_sdhost_send_command(host, mrq->cmd); -+ -+ mmiowb(); -+ spin_unlock_irqrestore(&host->lock, flags); -+ -+ if (!mrq->sbc && mrq->cmd->data && host->use_dma) -+ /* DMA transfer starts now, PIO starts after irq */ -+ bcm2835_sdhost_transfer_dma(host); -+ -+ if (!host->use_busy) -+ bcm2835_sdhost_finish_command(host); -+} -+ -+ -+static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) -+{ -+ -+ struct bcm2835_host *host = mmc_priv(mmc); -+ unsigned long flags; -+ -+ pr_debug("bcm2835_sdhost_set_ios: clock %d, pwr %d, bus_width %d, timing %d, vdd %d, drv_type %d\n", -+ ios->clock, ios->power_mode, ios->bus_width, -+ ios->timing, ios->signal_voltage, ios->drv_type); -+ -+ spin_lock_irqsave(&host->lock, flags); -+ -+ if (!ios->clock || ios->clock != host->clock) { -+ bcm2835_sdhost_set_clock(host, ios->clock); -+ host->clock = ios->clock; -+ } -+ -+ /* set bus width */ -+ host->hcfg &= ~SDHCFG_WIDE_EXT_BUS; -+ if (ios->bus_width == MMC_BUS_WIDTH_4) -+ host->hcfg |= SDHCFG_WIDE_EXT_BUS; -+ -+ host->hcfg |= SDHCFG_WIDE_INT_BUS; -+ -+ /* Disable clever clock switching, to cope with fast core clocks */ -+ host->hcfg |= SDHCFG_SLOW_CARD; -+ -+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG); -+ -+ mmiowb(); -+ -+ spin_unlock_irqrestore(&host->lock, flags); -+} -+ -+static int bcm2835_sdhost_multi_io_quirk(struct mmc_card *card, -+ unsigned int direction, -+ u32 blk_pos, int blk_size) -+{ -+ /* There is a bug in the host controller hardware that makes -+ reading the final sector of the card as part of a multiple read -+ problematic. Detect that case and shorten the read accordingly. -+ */ -+ /* csd.capacity is in weird units - convert to sectors */ -+ u32 card_sectors = (card->csd.capacity << (card->csd.read_blkbits - 9)); -+ -+ if ((direction == MMC_DATA_READ) && -+ ((blk_pos + blk_size) == card_sectors)) -+ blk_size--; -+ -+ return blk_size; -+} -+ -+ -+static struct mmc_host_ops bcm2835_sdhost_ops = { -+ .request = bcm2835_sdhost_request, -+ .set_ios = bcm2835_sdhost_set_ios, -+ .enable_sdio_irq = bcm2835_sdhost_enable_sdio_irq, -+ .multi_io_quirk = bcm2835_sdhost_multi_io_quirk, -+}; -+ -+ -+static void bcm2835_sdhost_tasklet_finish(unsigned long param) -+{ -+ struct bcm2835_host *host; -+ unsigned long flags; -+ struct mmc_request *mrq; -+ -+ host = (struct bcm2835_host *)param; -+ -+ spin_lock_irqsave(&host->lock, flags); -+ -+ /* -+ * If this tasklet gets rescheduled while running, it will -+ * be run again afterwards but without any active request. -+ */ -+ if (!host->mrq) { -+ spin_unlock_irqrestore(&host->lock, flags); -+ return; -+ } -+ -+ del_timer(&host->timer); -+ -+ mrq = host->mrq; -+ -+ /* -+ * The controller needs a reset of internal state machines -+ * upon error conditions. -+ */ -+ if (((mrq->cmd && mrq->cmd->error) || -+ (mrq->data && (mrq->data->error || -+ (mrq->data->stop && mrq->data->stop->error))))) { -+ -+ bcm2835_sdhost_reset(host); -+ } -+ -+ host->mrq = NULL; -+ host->cmd = NULL; -+ host->data = NULL; -+ -+ mmiowb(); -+ -+ spin_unlock_irqrestore(&host->lock, flags); -+ mmc_request_done(host->mmc, mrq); -+} -+ -+ -+ -+int bcm2835_sdhost_add_host(struct bcm2835_host *host) -+{ -+ struct mmc_host *mmc; -+ struct dma_slave_config cfg; -+ int ret; -+ -+ mmc = host->mmc; -+ -+ bcm2835_sdhost_reset(host); -+ -+ mmc->f_max = host->max_clk; -+ mmc->f_min = host->max_clk / SDCDIV_MAX_CDIV; -+ -+ /* SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK */ -+ host->timeout_clk = mmc->f_max / 1000; -+#ifdef CONFIG_ARCH_BCM2835 -+ mmc->max_busy_timeout = (1 << 27) / host->timeout_clk; -+#endif -+ /* host controller capabilities */ -+ mmc->caps |= /* MMC_CAP_SDIO_IRQ |*/ MMC_CAP_4_BIT_DATA | -+ MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | -+ MMC_CAP_NEEDS_POLL | -+ (ALLOW_CMD23 * MMC_CAP_CMD23); -+ -+ spin_lock_init(&host->lock); -+ -+ if (host->allow_dma) { -+ if (!host->dma_chan_tx || !host->dma_chan_rx || -+ IS_ERR(host->dma_chan_tx) || IS_ERR(host->dma_chan_rx)) { -+ pr_err("%s: Unable to initialise DMA channels. Falling back to PIO\n", DRIVER_NAME); -+ host->have_dma = false; -+ } else { -+ pr_info("DMA channels allocated for the SDHost driver"); -+ host->have_dma = true; -+ -+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; -+ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; -+ cfg.slave_id = 13; /* DREQ channel */ -+ -+ cfg.direction = DMA_MEM_TO_DEV; -+ cfg.src_addr = 0; -+ cfg.dst_addr = host->phys_addr + SDDATA; -+ ret = dmaengine_slave_config(host->dma_chan_tx, &cfg); -+ -+ cfg.direction = DMA_DEV_TO_MEM; -+ cfg.src_addr = host->phys_addr + SDDATA; -+ cfg.dst_addr = 0; -+ ret = dmaengine_slave_config(host->dma_chan_rx, &cfg); -+ } -+ } else { -+ pr_info("Forcing PIO mode\n"); -+ host->have_dma = false; -+ } -+ -+ mmc->max_segs = 128; -+ mmc->max_req_size = 524288; -+ mmc->max_seg_size = mmc->max_req_size; -+ mmc->max_blk_size = 512; -+ mmc->max_blk_count = 65535; -+ -+ /* report supported voltage ranges */ -+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; -+ -+ tasklet_init(&host->finish_tasklet, -+ bcm2835_sdhost_tasklet_finish, (unsigned long)host); -+ -+ setup_timer(&host->timer, bcm2835_sdhost_timeout_timer, (unsigned long)host); -+ -+ bcm2835_sdhost_init(host, 0); -+#ifndef CONFIG_ARCH_BCM2835 -+ ret = request_irq(host->irq, bcm2835_sdhost_irq, 0 /*IRQF_SHARED*/, -+ mmc_hostname(mmc), host); -+#else -+ ret = request_threaded_irq(host->irq, bcm2835_sdhost_irq, bcm2835_sdhost_thread_irq, -+ IRQF_SHARED, mmc_hostname(mmc), host); -+#endif -+ if (ret) { -+ pr_err("%s: Failed to request IRQ %d: %d\n", -+ mmc_hostname(mmc), host->irq, ret); -+ goto untasklet; -+ } -+ -+ mmiowb(); -+ mmc_add_host(mmc); -+ -+ pr_info("Load BCM2835 SDHost driver\n"); -+ if (host->delay_after_stop) -+ pr_info("BCM2835 SDHost: delay_after_stop=%dus\n", -+ host->delay_after_stop); -+ -+ return 0; -+ -+untasklet: -+ tasklet_kill(&host->finish_tasklet); -+ -+ return ret; -+} -+ -+static int bcm2835_sdhost_probe(struct platform_device *pdev) -+{ -+ struct device *dev = &pdev->dev; -+ struct device_node *node = dev->of_node; -+ struct clk *clk; -+ struct resource *iomem; -+ struct bcm2835_host *host; -+ struct mmc_host *mmc; -+ int ret; -+ -+ pr_debug("bcm2835_sdhost_probe\n"); -+ mmc = mmc_alloc_host(sizeof(*host), dev); -+ if (!mmc) -+ return -ENOMEM; -+ -+ mmc->ops = &bcm2835_sdhost_ops; -+ host = mmc_priv(mmc); -+ host->mmc = mmc; -+ host->timeout = msecs_to_jiffies(1000); -+ spin_lock_init(&host->lock); -+ -+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); -+ host->ioaddr = devm_ioremap_resource(dev, iomem); -+ if (IS_ERR(host->ioaddr)) { -+ ret = PTR_ERR(host->ioaddr); -+ goto err; -+ } -+ -+ host->phys_addr = iomem->start + BCM2835_VCMMU_SHIFT; -+ pr_debug(" - ioaddr %lx, iomem->start %lx, phys_addr %lx\n", -+ (unsigned long)host->ioaddr, -+ (unsigned long)iomem->start, -+ (unsigned long)host->phys_addr); -+ -+ host->allow_dma = ALLOW_DMA; -+ -+ if (node) { -+ /* Read any custom properties */ -+ of_property_read_u32(node, -+ "brcm,delay-after-stop", -+ &host->delay_after_stop); -+ of_property_read_u32(node, -+ "brcm,overclock-50", -+ &host->overclock_50); -+ host->allow_dma = ALLOW_DMA && -+ !of_property_read_bool(node, "brcm,force-pio"); -+ } -+ -+ if (host->allow_dma) { -+ if (node) { -+ host->dma_chan_tx = -+ dma_request_slave_channel(dev, "tx"); -+ host->dma_chan_rx = -+ dma_request_slave_channel(dev, "rx"); -+ } else { -+ dma_cap_mask_t mask; -+ -+ dma_cap_zero(mask); -+ /* we don't care about the channel, any would work */ -+ dma_cap_set(DMA_SLAVE, mask); -+ host->dma_chan_tx = -+ dma_request_channel(mask, NULL, NULL); -+ host->dma_chan_rx = -+ dma_request_channel(mask, NULL, NULL); -+ } -+ } -+ -+ clk = devm_clk_get(dev, NULL); -+ if (IS_ERR(clk)) { -+ dev_err(dev, "could not get clk\n"); -+ ret = PTR_ERR(clk); -+ goto err; -+ } -+ -+ host->max_clk = clk_get_rate(clk); -+ -+ host->irq = platform_get_irq(pdev, 0); -+ if (host->irq <= 0) { -+ dev_err(dev, "get IRQ failed\n"); -+ ret = -EINVAL; -+ goto err; -+ } -+ -+ pr_debug(" - max_clk %lx, irq %d\n", -+ (unsigned long)host->max_clk, -+ (int)host->irq); -+ -+ if (node) -+ mmc_of_parse(mmc); -+ else -+ mmc->caps |= MMC_CAP_4_BIT_DATA; -+ -+ ret = bcm2835_sdhost_add_host(host); -+ if (ret) -+ goto err; -+ -+ platform_set_drvdata(pdev, host); -+ -+ pr_debug("bcm2835_sdhost_probe -> OK\n"); -+ -+ return 0; -+ -+err: -+ pr_debug("bcm2835_sdhost_probe -> err %d\n", ret); -+ mmc_free_host(mmc); -+ -+ return ret; -+} -+ -+static int bcm2835_sdhost_remove(struct platform_device *pdev) -+{ -+ struct bcm2835_host *host = platform_get_drvdata(pdev); -+ -+ pr_debug("bcm2835_sdhost_remove\n"); -+ -+ mmc_remove_host(host->mmc); -+ -+ bcm2835_sdhost_set_power(host, false); -+ -+ free_irq(host->irq, host); -+ -+ del_timer_sync(&host->timer); -+ -+ tasklet_kill(&host->finish_tasklet); -+ -+ mmc_free_host(host->mmc); -+ platform_set_drvdata(pdev, NULL); -+ -+ pr_debug("bcm2835_sdhost_remove - OK\n"); -+ return 0; -+} -+ -+ -+static const struct of_device_id bcm2835_sdhost_match[] = { -+ { .compatible = "brcm,bcm2835-sdhost" }, -+ { } -+}; -+MODULE_DEVICE_TABLE(of, bcm2835_sdhost_match); -+ -+ -+ -+static struct platform_driver bcm2835_sdhost_driver = { -+ .probe = bcm2835_sdhost_probe, -+ .remove = bcm2835_sdhost_remove, -+ .driver = { -+ .name = DRIVER_NAME, -+ .owner = THIS_MODULE, -+ .of_match_table = bcm2835_sdhost_match, -+ }, -+}; -+module_platform_driver(bcm2835_sdhost_driver); -+ -+MODULE_ALIAS("platform:sdhost-bcm2835"); -+MODULE_DESCRIPTION("BCM2835 SDHost driver"); -+MODULE_LICENSE("GPL v2"); -+MODULE_AUTHOR("Phil Elwell"); |