+++ /dev/null
-From 5fcaebde5b5cd58630ea70bbfe0c62f8229469c5 Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.org>
-Date: Wed, 25 Mar 2015 17:49:47 +0000
-Subject: [PATCH] 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.
-
-bcm2835-sdhost: Improve error handling and recovery
-
-1) Expose the hw_reset method to the MMC framework, removing many
- internal calls by the driver.
-
-2) Reduce overclock setting on error.
-
-3) Increase timeout to cope with high capacity cards.
-
-4) Add properties and parameters to control pio_limit and debug.
-
-5) Reduce messages at probe time.
-
-bcm2835-sdhost: Further improve overclock back-off
-
-bcm2835-sdhost: Clear HBLC for PIO mode
-
-Also update pio_limit default in overlay README.
-
-bcm2835-sdhost: Add the ERASE capability
-
-See: https://github.com/raspberrypi/linux/issues/1076
-
-bcm2835-sdhost: Ignore CRC7 for MMC CMD1
-
-It seems that the sdhost interface returns CRC7 errors for CMD1,
-which is the MMC-specific SEND_OP_COND. Returning these errors to
-the MMC layer causes a downward spiral, but ignoring them seems
-to be harmless.
-
-bcm2835-mmc/sdhost: Remove ARCH_BCM2835 differences
-
-The bcm2835-mmc driver (and -sdhost driver that copied from it)
-contains code to handle SDIO interrupts in a threaded interrupt
-handler rather than waking the MMC framework thread. The change
-follows a patch from Russell King that adds the facility as the
-preferred way of working.
-
-However, the new code path is only present in ARCH_BCM2835
-builds, which I have taken to be a way of testing the waters
-rather than making the change across the board; I can't see
-any technical reason why it wouldn't be enabled for MACH_BCM270X
-builds. So this patch standardises on the ARCH_BCM2835 code,
-removing the old code paths.
-
-bcm2835-sdhost: Don't log timeout errors unless debug=1
-
-The MMC card-discovery process generates timeouts. This is
-expected behaviour, so reporting it to the user serves no purpose.
-Suppress the reporting of timeout errors unless the debug flag
-is on.
-
-bcm2835-sdhost: Add workaround for odd behaviour on some cards
-
-For reasons not understood, the sdhost driver fails when reading
-sectors very near the end of some SD cards. The problem could
-be related to the similar issue that reading the final sector
-of any card as part of a multiple read never completes, and the
-workaround is an extension of the mechanism introduced to solve
-that problem which ensures those sectors are always read singly.
-
-bcm2835-sdhost: Major revision
-
-This is a significant revision of the bcm2835-sdhost driver. It
-improves on the original in a number of ways:
-
-1) Through the use of CMD23 for reads it appears to avoid problems
- reading some sectors on certain high speed cards.
-2) Better atomicity to prevent crashes.
-3) Higher performance.
-4) Activity logging included, for easier diagnosis in the event
- of a problem.
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
-
-bcm2835-sdhost: Restore ATOMIC flag to PIO sg mapping
-
-Allocation problems have been seen in a wireless driver, and
-this is the only change which might have been responsible.
-
-SQUASH: bcm2835-sdhost: Only claim one DMA channel
-
-With both MMC controllers enabled there are few DMA channels left. The
-bcm2835-sdhost driver only uses DMA in one direction at a time, so it
-doesn't need to claim two channels.
-
-See: https://github.com/raspberrypi/linux/issues/1327
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
-
-bcm2835-sdhost: Workaround for "slow" sectors
-
-Some cards have been seen to cause timeouts after certain sectors are
-read. This workaround enforces a minimum delay between the stop after
-reading one of those sectors and a subsequent data command.
-
-Using CMD23 (SET_BLOCK_COUNT) avoids this problem, so good cards will
-not be penalised by this workaround.
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
-
-bcm2835-sdhost: Firmware manages the clock divisor
-
-The bcm2835-sdhost driver hands control of the CDIV clock divisor
-register to matching firmware, allowing it to adjust to a changing
-core clock. This removes the need to use the performance governor or
-to enable io_is_busy on the on-demand governor in order to get the
-best SD performance.
-
-N.B. As SD clocks must be an integer divisor of the core clock, it is
-possible that the SD clock for "turbo" mode can be different (even
-lower) than "normal" mode.
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
-
-bcm2835-sdhost: Reset the clock in task context
-
-Since reprogramming the clock can now involve a round-trip to the
-firmware it must not be done at atomic context, and a tasklet
-is not a task.
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
-
-bcm2835-sdhost: Don't exit cmd wait loop on error
-
-The FAIL flag can be set in the CMD register before command processing
-is complete, leading to spurious "failed to complete" errors. This has
-the effect of promoting harmless CRC7 errors during CMD1 processing
-into errors that can delay and even prevent booting.
-
-Also:
-1) Convert the last KERN_ERROR message in the register dumping to
- KERN_INFO.
-2) Remove an unnecessary reset call from bcm2835_sdhost_add_host.
-
-See: https://github.com/raspberrypi/linux/pull/1492
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
-
-bcm2835-sdhost: mmc_card_blockaddr fix
-
-Get the definition of mmc_card_blockaddr from drivers/mmc/core/card.h.
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
-
-bcm2835-sdhost: New timer API
-
-mmc: bcm2835-sdhost: Support underclocking
-
-Support underclocking of the SD bus in two ways:
-1. using the max-frequency DT property (which currently has no DT
- parameter), and
-2. using the exiting sd_overclock parameter.
-
-The two methods differ slightly - in the former the MMC subsystem is
-aware of the underclocking, while in the latter it isn't - but the
-end results should be the same.
-
-See: https://github.com/raspberrypi/linux/issues/2350
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
-
-mmc: bcm2835-sdhost: Add include
-
-highmem.h (needed for kmap_atomic) is pulled in by one of the other
-include files, but only with some CONFIG settings. Make the inclusion
-explicit to cater for cases where the CONFIG setting is absent.
-
-See: https://github.com/raspberrypi/linux/issues/2366
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
----
- drivers/mmc/host/Kconfig | 10 +
- drivers/mmc/host/Makefile | 1 +
- drivers/mmc/host/bcm2835-sdhost.c | 2191 +++++++++++++++++++++++++++++
- 3 files changed, 2202 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 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_DEBUG
- bool "MMC host drivers debugging"
- depends on MMC != n
---- a/drivers/mmc/host/Makefile
-+++ b/drivers/mmc/host/Makefile
-@@ -22,6 +22,7 @@ obj-$(CONFIG_MMC_SDHCI_SIRF) += sdhci
- obj-$(CONFIG_MMC_SDHCI_F_SDH30) += sdhci_f_sdh30.o
- obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
- obj-$(CONFIG_MMC_BCM2835_MMC) += bcm2835-mmc.o
-+obj-$(CONFIG_MMC_BCM2835_SDHOST) += bcm2835-sdhost.o
- obj-$(CONFIG_MMC_WBSD) += wbsd.o
- obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
- obj-$(CONFIG_MMC_MTK) += mtk-sd.o
---- /dev/null
-+++ b/drivers/mmc/host/bcm2835-sdhost.c
-@@ -0,0 +1,2191 @@
-+/*
-+ * BCM2835 SD host driver.
-+ *
-+ * Author: Phil Elwell <phil@raspberrypi.org>
-+ * Copyright (C) 2015-2016 Raspberry Pi (Trading) Ltd.
-+ *
-+ * 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 FIFO_READ_THRESHOLD 4
-+#define FIFO_WRITE_THRESHOLD 4
-+#define ALLOW_CMD23_READ 1
-+#define ALLOW_CMD23_WRITE 0
-+#define ENABLE_LOG 1
-+#define SDDATA_FIFO_PIO_BURST 8
-+#define CMD_DALLY_US 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/mmc/sdio.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>
-+#include <linux/workqueue.h>
-+#include <linux/interrupt.h>
-+#include <linux/highmem.h>
-+#include <soc/bcm2835/raspberrypi-firmware.h>
-+
-+/* For mmc_card_blockaddr */
-+#include "../core/card.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_CRC7_ERROR|SDHSTS_CRC16_ERROR|SDHSTS_REW_TIME_OUT|SDHSTS_FIFO_ERROR)
-+#define SDHSTS_ERROR_MASK (SDHSTS_CMD_TIME_OUT|SDHSTS_TRANSFER_ERROR_MASK)
-+
-+#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
-+
-+#define SDEDM_FSM_MASK 0xf
-+#define SDEDM_FSM_IDENTMODE 0x0
-+#define SDEDM_FSM_DATAMODE 0x1
-+#define SDEDM_FSM_READDATA 0x2
-+#define SDEDM_FSM_WRITEDATA 0x3
-+#define SDEDM_FSM_READWAIT 0x4
-+#define SDEDM_FSM_READCRC 0x5
-+#define SDEDM_FSM_WRITECRC 0x6
-+#define SDEDM_FSM_WRITEWAIT1 0x7
-+#define SDEDM_FSM_POWERDOWN 0x8
-+#define SDEDM_FSM_POWERUP 0x9
-+#define SDEDM_FSM_WRITESTART1 0xa
-+#define SDEDM_FSM_WRITESTART2 0xb
-+#define SDEDM_FSM_GENPULSES 0xc
-+#define SDEDM_FSM_WRITEWAIT2 0xd
-+#define SDEDM_FSM_STARTPOWDOWN 0xf
-+
-+#define SDDATA_FIFO_WORDS 16
-+
-+#define USE_CMD23_FLAGS ((ALLOW_CMD23_READ * MMC_DATA_READ) | \
-+ (ALLOW_CMD23_WRITE * MMC_DATA_WRITE))
-+
-+#define MHZ 1000000
-+
-+
-+struct bcm2835_host {
-+ spinlock_t lock;
-+
-+ void __iomem *ioaddr;
-+ u32 bus_addr;
-+
-+ struct mmc_host *mmc;
-+
-+ u32 pio_timeout; /* In jiffies */
-+
-+ int clock; /* Current clock speed */
-+
-+ bool slow_card; /* Force 11-bit divisor */
-+
-+ unsigned int max_clk; /* Max possible freq */
-+
-+ struct tasklet_struct finish_tasklet; /* Tasklet structures */
-+
-+ struct work_struct cmd_wait_wq; /* Workqueue function */
-+
-+ 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 */
-+
-+ u32 cmd_quick_poll_retries;
-+ u32 ns_per_fifo_word;
-+
-+ /* 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 */
-+
-+ unsigned int use_sbc:1; /* Send CMD23 */
-+
-+ unsigned int debug:1; /* Enable debug output */
-+ unsigned int firmware_sets_cdiv:1; /* Let the firmware manage the clock */
-+ unsigned int reset_clock:1; /* Reset the clock fore the next request */
-+
-+ /*DMA part*/
-+ struct dma_chan *dma_chan_rxtx; /* DMA channel for reads and writes */
-+ struct dma_chan *dma_chan; /* Channel in use */
-+ struct dma_slave_config dma_cfg_rx;
-+ struct dma_slave_config dma_cfg_tx;
-+ struct dma_async_tx_descriptor *dma_desc;
-+ u32 dma_dir;
-+ u32 drain_words;
-+ struct page *drain_page;
-+ u32 drain_offset;
-+
-+ bool allow_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 delay_after_this_stop; /* minimum time between this stop and subsequent data transfer */
-+ u32 user_overclock_50; /* User's preferred frequency to use when 50MHz is requested (in MHz) */
-+ u32 overclock_50; /* frequency to use when 50MHz is requested (in MHz) */
-+ u32 overclock; /* Current frequency if overclocked, else zero */
-+ u32 pio_limit; /* Maximum block count for PIO (0 = always DMA) */
-+
-+ u32 sectors; /* Cached card size in sectors */
-+};
-+
-+#if ENABLE_LOG
-+
-+struct log_entry_struct {
-+ char event[4];
-+ u32 timestamp;
-+ u32 param1;
-+ u32 param2;
-+};
-+
-+typedef struct log_entry_struct LOG_ENTRY_T;
-+
-+LOG_ENTRY_T *sdhost_log_buf;
-+dma_addr_t sdhost_log_addr;
-+static u32 sdhost_log_idx;
-+static spinlock_t log_lock;
-+static void __iomem *timer_base;
-+
-+#define LOG_ENTRIES (256*1)
-+#define LOG_SIZE (sizeof(LOG_ENTRY_T)*LOG_ENTRIES)
-+
-+static void log_init(struct device *dev, u32 bus_to_phys)
-+{
-+ spin_lock_init(&log_lock);
-+ sdhost_log_buf = dma_zalloc_coherent(dev, LOG_SIZE, &sdhost_log_addr,
-+ GFP_KERNEL);
-+ if (sdhost_log_buf) {
-+ pr_info("sdhost: log_buf @ %p (%x)\n",
-+ sdhost_log_buf, sdhost_log_addr);
-+ timer_base = ioremap_nocache(bus_to_phys + 0x7e003000, SZ_4K);
-+ if (!timer_base)
-+ pr_err("sdhost: failed to remap timer\n");
-+ }
-+ else
-+ pr_err("sdhost: failed to allocate log buf\n");
-+}
-+
-+static void log_event_impl(const char *event, u32 param1, u32 param2)
-+{
-+ if (sdhost_log_buf) {
-+ LOG_ENTRY_T *entry;
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&log_lock, flags);
-+
-+ entry = sdhost_log_buf + sdhost_log_idx;
-+ memcpy(entry->event, event, 4);
-+ entry->timestamp = (readl(timer_base + 4) & 0x3fffffff) +
-+ (smp_processor_id()<<30);
-+ entry->param1 = param1;
-+ entry->param2 = param2;
-+ sdhost_log_idx = (sdhost_log_idx + 1) % LOG_ENTRIES;
-+
-+ spin_unlock_irqrestore(&log_lock, flags);
-+ }
-+}
-+
-+static void log_dump(void)
-+{
-+ if (sdhost_log_buf) {
-+ LOG_ENTRY_T *entry;
-+ unsigned long flags;
-+ int idx;
-+
-+ spin_lock_irqsave(&log_lock, flags);
-+
-+ idx = sdhost_log_idx;
-+ do {
-+ entry = sdhost_log_buf + idx;
-+ if (entry->event[0] != '\0')
-+ pr_info("[%08x] %.4s %x %x\n",
-+ entry->timestamp,
-+ entry->event,
-+ entry->param1,
-+ entry->param2);
-+ idx = (idx + 1) % LOG_ENTRIES;
-+ } while (idx != sdhost_log_idx);
-+
-+ spin_unlock_irqrestore(&log_lock, flags);
-+ }
-+}
-+
-+#define log_event(event, param1, param2) log_event_impl(event, param1, param2)
-+
-+#else
-+
-+#define log_init(x) (void)0
-+#define log_event(event, param1, param2) (void)0
-+#define log_dump() (void)0
-+
-+#endif
-+
-+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_dumpcmd(struct bcm2835_host *host,
-+ struct mmc_command *cmd,
-+ const char *label)
-+{
-+ if (cmd)
-+ pr_info("%s:%c%s op %d arg 0x%x flags 0x%x - resp %08x %08x %08x %08x, err %d\n",
-+ mmc_hostname(host->mmc),
-+ (cmd == host->cmd) ? '>' : ' ',
-+ label, cmd->opcode, cmd->arg, cmd->flags,
-+ cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3],
-+ cmd->error);
-+}
-+
-+static void bcm2835_sdhost_dumpregs(struct bcm2835_host *host)
-+{
-+ if (host->mrq)
-+ {
-+ bcm2835_sdhost_dumpcmd(host, host->mrq->sbc, "sbc");
-+ bcm2835_sdhost_dumpcmd(host, host->mrq->cmd, "cmd");
-+ if (host->mrq->data)
-+ pr_info("%s: data blocks %x blksz %x - err %d\n",
-+ mmc_hostname(host->mmc),
-+ host->mrq->data->blocks,
-+ host->mrq->data->blksz,
-+ host->mrq->data->error);
-+ bcm2835_sdhost_dumpcmd(host, host->mrq->stop, "stop");
-+ }
-+
-+ pr_info("%s: =========== REGISTER DUMP ===========\n",
-+ mmc_hostname(host->mmc));
-+
-+ pr_info("%s: SDCMD 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDCMD));
-+ pr_info("%s: SDARG 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDARG));
-+ pr_info("%s: SDTOUT 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDTOUT));
-+ pr_info("%s: SDCDIV 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDCDIV));
-+ pr_info("%s: SDRSP0 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDRSP0));
-+ pr_info("%s: SDRSP1 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDRSP1));
-+ pr_info("%s: SDRSP2 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDRSP2));
-+ pr_info("%s: SDRSP3 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDRSP3));
-+ pr_info("%s: SDHSTS 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDHSTS));
-+ pr_info("%s: SDVDD 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDVDD));
-+ pr_info("%s: SDEDM 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDEDM));
-+ pr_info("%s: SDHCFG 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDHCFG));
-+ pr_info("%s: SDHBCT 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDHBCT));
-+ pr_info("%s: SDHBLC 0x%08x\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDHBLC));
-+
-+ pr_info("%s: ===========================================\n",
-+ mmc_hostname(host->mmc));
-+}
-+
-+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_internal(struct bcm2835_host *host)
-+{
-+ u32 temp;
-+
-+ if (host->debug)
-+ pr_info("%s: reset\n", mmc_hostname(host->mmc));
-+
-+ 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 |= (FIFO_READ_THRESHOLD << SDEDM_READ_THRESHOLD_SHIFT) |
-+ (FIFO_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;
-+ host->sectors = 0;
-+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
-+ bcm2835_sdhost_write(host, SDCDIV_MAX_CDIV, SDCDIV);
-+ mmiowb();
-+}
-+
-+static void bcm2835_sdhost_reset(struct mmc_host *mmc)
-+{
-+ struct bcm2835_host *host = mmc_priv(mmc);
-+ unsigned long flags;
-+ spin_lock_irqsave(&host->lock, flags);
-+ log_event("RST<", 0, 0);
-+
-+ bcm2835_sdhost_reset_internal(host);
-+
-+ spin_unlock_irqrestore(&host->lock, flags);
-+}
-+
-+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_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)
-+{
-+ int timediff;
-+ u32 alternate_idle;
-+ u32 edm;
-+
-+ alternate_idle = (host->mrq->data->flags & MMC_DATA_READ) ?
-+ SDEDM_FSM_READWAIT : SDEDM_FSM_WRITESTART1;
-+
-+ edm = bcm2835_sdhost_read(host, SDEDM);
-+
-+ log_event("WTC<", edm, 0);
-+
-+ timediff = 0;
-+
-+ while (1) {
-+ u32 fsm = edm & SDEDM_FSM_MASK;
-+ if ((fsm == SDEDM_FSM_IDENTMODE) ||
-+ (fsm == SDEDM_FSM_DATAMODE))
-+ break;
-+ if (fsm == alternate_idle) {
-+ bcm2835_sdhost_write(host,
-+ edm | SDEDM_FORCE_DATA_MODE,
-+ SDEDM);
-+ break;
-+ }
-+
-+ timediff++;
-+ if (timediff == 100000) {
-+ pr_err("%s: wait_transfer_complete - still waiting after %d retries\n",
-+ mmc_hostname(host->mmc),
-+ timediff);
-+ log_dump();
-+ bcm2835_sdhost_dumpregs(host);
-+ host->mrq->data->error = -ETIMEDOUT;
-+ log_event("WTC!", edm, 0);
-+ return;
-+ }
-+ cpu_relax();
-+ edm = bcm2835_sdhost_read(host, SDEDM);
-+ }
-+ log_event("WTC>", edm, 0);
-+}
-+
-+static void bcm2835_sdhost_finish_data(struct bcm2835_host *host);
-+
-+static void bcm2835_sdhost_dma_complete(void *param)
-+{
-+ struct bcm2835_host *host = param;
-+ struct mmc_data *data = host->data;
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&host->lock, flags);
-+ log_event("DMA<", (u32)host->data, bcm2835_sdhost_read(host, SDHSTS));
-+ log_event("DMA ", bcm2835_sdhost_read(host, SDCMD),
-+ bcm2835_sdhost_read(host, SDEDM));
-+
-+ if (host->dma_chan) {
-+ dma_unmap_sg(host->dma_chan->device->dev,
-+ data->sg, data->sg_len,
-+ host->dma_dir);
-+
-+ host->dma_chan = NULL;
-+ }
-+
-+ if (host->drain_words) {
-+ void *page;
-+ u32 *buf;
-+
-+ page = kmap_atomic(host->drain_page);
-+ buf = page + host->drain_offset;
-+
-+ while (host->drain_words) {
-+ u32 edm = bcm2835_sdhost_read(host, SDEDM);
-+ if ((edm >> 4) & 0x1f)
-+ *(buf++) = bcm2835_sdhost_read(host,
-+ SDDATA);
-+ host->drain_words--;
-+ }
-+
-+ kunmap_atomic(page);
-+ }
-+
-+ bcm2835_sdhost_finish_data(host);
-+
-+ log_event("DMA>", (u32)host->data, 0);
-+ 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;
-+ unsigned long wait_max;
-+
-+ blksize = host->data->blksz;
-+
-+ wait_max = jiffies + msecs_to_jiffies(host->pio_timeout);
-+
-+ local_irq_save(flags);
-+
-+ while (blksize) {
-+ int copy_words;
-+ u32 hsts = 0;
-+
-+ if (!sg_miter_next(&host->sg_miter)) {
-+ host->data->error = -EINVAL;
-+ break;
-+ }
-+
-+ len = min(host->sg_miter.length, blksize);
-+ if (len % 4) {
-+ host->data->error = -EINVAL;
-+ break;
-+ }
-+
-+ blksize -= len;
-+ host->sg_miter.consumed = len;
-+
-+ buf = (u32 *)host->sg_miter.addr;
-+
-+ copy_words = len/4;
-+
-+ while (copy_words) {
-+ int burst_words, words;
-+ u32 edm;
-+
-+ burst_words = SDDATA_FIFO_PIO_BURST;
-+ if (burst_words > copy_words)
-+ burst_words = copy_words;
-+ edm = bcm2835_sdhost_read(host, SDEDM);
-+ words = ((edm >> 4) & 0x1f);
-+
-+ if (words < burst_words) {
-+ int fsm_state = (edm & SDEDM_FSM_MASK);
-+ if ((fsm_state != SDEDM_FSM_READDATA) &&
-+ (fsm_state != SDEDM_FSM_READWAIT) &&
-+ (fsm_state != SDEDM_FSM_READCRC)) {
-+ hsts = bcm2835_sdhost_read(host,
-+ SDHSTS);
-+ pr_info("%s: fsm %x, hsts %x\n",
-+ mmc_hostname(host->mmc),
-+ fsm_state, hsts);
-+ if (hsts & SDHSTS_ERROR_MASK)
-+ break;
-+ }
-+
-+ if (time_after(jiffies, wait_max)) {
-+ pr_err("%s: PIO read timeout - EDM %x\n",
-+ mmc_hostname(host->mmc),
-+ edm);
-+ hsts = SDHSTS_REW_TIME_OUT;
-+ break;
-+ }
-+ ndelay((burst_words - words) *
-+ host->ns_per_fifo_word);
-+ continue;
-+ } else if (words > copy_words) {
-+ words = copy_words;
-+ }
-+
-+ copy_words -= words;
-+
-+ while (words) {
-+ *(buf++) = bcm2835_sdhost_read(host, SDDATA);
-+ words--;
-+ }
-+ }
-+
-+ if (hsts & SDHSTS_ERROR_MASK)
-+ break;
-+ }
-+
-+ 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;
-+ unsigned long wait_max;
-+
-+ blksize = host->data->blksz;
-+
-+ wait_max = jiffies + msecs_to_jiffies(host->pio_timeout);
-+
-+ local_irq_save(flags);
-+
-+ while (blksize) {
-+ int copy_words;
-+ u32 hsts = 0;
-+
-+ if (!sg_miter_next(&host->sg_miter)) {
-+ host->data->error = -EINVAL;
-+ break;
-+ }
-+
-+ len = min(host->sg_miter.length, blksize);
-+ if (len % 4) {
-+ host->data->error = -EINVAL;
-+ break;
-+ }
-+
-+ blksize -= len;
-+ host->sg_miter.consumed = len;
-+
-+ buf = (u32 *)host->sg_miter.addr;
-+
-+ copy_words = len/4;
-+
-+ while (copy_words) {
-+ int burst_words, words;
-+ u32 edm;
-+
-+ burst_words = SDDATA_FIFO_PIO_BURST;
-+ if (burst_words > copy_words)
-+ burst_words = copy_words;
-+ edm = bcm2835_sdhost_read(host, SDEDM);
-+ words = SDDATA_FIFO_WORDS - ((edm >> 4) & 0x1f);
-+
-+ if (words < burst_words) {
-+ int fsm_state = (edm & SDEDM_FSM_MASK);
-+ if ((fsm_state != SDEDM_FSM_WRITEDATA) &&
-+ (fsm_state != SDEDM_FSM_WRITESTART1) &&
-+ (fsm_state != SDEDM_FSM_WRITESTART2)) {
-+ hsts = bcm2835_sdhost_read(host,
-+ SDHSTS);
-+ pr_info("%s: fsm %x, hsts %x\n",
-+ mmc_hostname(host->mmc),
-+ fsm_state, hsts);
-+ if (hsts & SDHSTS_ERROR_MASK)
-+ break;
-+ }
-+
-+ if (time_after(jiffies, wait_max)) {
-+ pr_err("%s: PIO write timeout - EDM %x\n",
-+ mmc_hostname(host->mmc),
-+ edm);
-+ hsts = SDHSTS_REW_TIME_OUT;
-+ break;
-+ }
-+ ndelay((burst_words - words) *
-+ host->ns_per_fifo_word);
-+ continue;
-+ } else if (words > copy_words) {
-+ words = copy_words;
-+ }
-+
-+ copy_words -= words;
-+
-+ while (words) {
-+ bcm2835_sdhost_write(host, *(buf++), SDDATA);
-+ words--;
-+ }
-+ }
-+
-+ if (hsts & SDHSTS_ERROR_MASK)
-+ break;
-+ }
-+
-+ sg_miter_stop(&host->sg_miter);
-+
-+ local_irq_restore(flags);
-+}
-+
-+static void bcm2835_sdhost_transfer_pio(struct bcm2835_host *host)
-+{
-+ u32 sdhsts;
-+ bool is_read;
-+ BUG_ON(!host->data);
-+ log_event("XFP<", (u32)host->data, host->blocks);
-+
-+ is_read = (host->data->flags & MMC_DATA_READ) != 0;
-+ if (is_read)
-+ bcm2835_sdhost_read_block_pio(host);
-+ else
-+ bcm2835_sdhost_write_block_pio(host);
-+
-+ sdhsts = bcm2835_sdhost_read(host, SDHSTS);
-+ if (sdhsts & (SDHSTS_CRC16_ERROR |
-+ SDHSTS_CRC7_ERROR |
-+ SDHSTS_FIFO_ERROR)) {
-+ pr_err("%s: %s transfer error - HSTS %x\n",
-+ mmc_hostname(host->mmc),
-+ is_read ? "read" : "write",
-+ sdhsts);
-+ host->data->error = -EILSEQ;
-+ } else if ((sdhsts & (SDHSTS_CMD_TIME_OUT |
-+ SDHSTS_REW_TIME_OUT))) {
-+ pr_err("%s: %s timeout error - HSTS %x\n",
-+ mmc_hostname(host->mmc),
-+ is_read ? "read" : "write",
-+ sdhsts);
-+ host->data->error = -ETIMEDOUT;
-+ }
-+ log_event("XFP>", (u32)host->data, host->blocks);
-+}
-+
-+static void bcm2835_sdhost_prepare_dma(struct bcm2835_host *host,
-+ struct mmc_data *data)
-+{
-+ int len, dir_data, dir_slave;
-+ struct dma_async_tx_descriptor *desc = NULL;
-+ struct dma_chan *dma_chan;
-+
-+ log_event("PRD<", (u32)data, 0);
-+ pr_debug("bcm2835_sdhost_prepare_dma()\n");
-+
-+ dma_chan = host->dma_chan_rxtx;
-+ if (data->flags & MMC_DATA_READ) {
-+ dir_data = DMA_FROM_DEVICE;
-+ dir_slave = DMA_DEV_TO_MEM;
-+ } else {
-+ dir_data = DMA_TO_DEVICE;
-+ dir_slave = DMA_MEM_TO_DEV;
-+ }
-+ log_event("PRD1", (u32)dma_chan, 0);
-+
-+ BUG_ON(!dma_chan->device);
-+ BUG_ON(!dma_chan->device->dev);
-+ BUG_ON(!data->sg);
-+
-+ /* The block doesn't manage the FIFO DREQs properly for multi-block
-+ transfers, so don't attempt to DMA the final few words.
-+ Unfortunately this requires the final sg entry to be trimmed.
-+ N.B. This code demands that the overspill is contained in
-+ a single sg entry.
-+ */
-+
-+ host->drain_words = 0;
-+ if ((data->blocks > 1) && (dir_data == DMA_FROM_DEVICE)) {
-+ struct scatterlist *sg;
-+ u32 len;
-+ int i;
-+
-+ len = min((u32)(FIFO_READ_THRESHOLD - 1) * 4,
-+ (u32)data->blocks * data->blksz);
-+
-+ for_each_sg(data->sg, sg, data->sg_len, i) {
-+ if (sg_is_last(sg)) {
-+ BUG_ON(sg->length < len);
-+ sg->length -= len;
-+ host->drain_page = sg_page(sg);
-+ host->drain_offset = sg->offset + sg->length;
-+ }
-+ }
-+ host->drain_words = len/4;
-+ }
-+
-+ /* The parameters have already been validated, so this will not fail */
-+ (void)dmaengine_slave_config(dma_chan,
-+ (dir_data == DMA_FROM_DEVICE) ?
-+ &host->dma_cfg_rx :
-+ &host->dma_cfg_tx);
-+
-+ len = dma_map_sg(dma_chan->device->dev, data->sg, data->sg_len,
-+ dir_data);
-+
-+ log_event("PRD2", len, 0);
-+ if (len > 0)
-+ desc = dmaengine_prep_slave_sg(dma_chan, data->sg,
-+ len, dir_slave,
-+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
-+ log_event("PRD3", (u32)desc, 0);
-+
-+ if (desc) {
-+ desc->callback = bcm2835_sdhost_dma_complete;
-+ desc->callback_param = host;
-+ host->dma_desc = desc;
-+ host->dma_chan = dma_chan;
-+ host->dma_dir = dir_data;
-+ }
-+ log_event("PDM>", (u32)data, 0);
-+}
-+
-+static void bcm2835_sdhost_start_dma(struct bcm2835_host *host)
-+{
-+ log_event("SDMA", (u32)host->data, (u32)host->dma_chan);
-+ dmaengine_submit(host->dma_desc);
-+ dma_async_issue_pending(host->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->dma_desc)
-+ 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);
-+
-+ host->data = 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_complete = 0;
-+ host->flush_fifo = 0;
-+ host->data->bytes_xfered = 0;
-+
-+ if (!host->sectors && host->mmc->card) {
-+ struct mmc_card *card = host->mmc->card;
-+ if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
-+ /*
-+ * The EXT_CSD sector count is in number of 512 byte
-+ * sectors.
-+ */
-+ host->sectors = card->ext_csd.sectors;
-+ } else {
-+ /*
-+ * The CSD capacity field is in units of read_blkbits.
-+ * set_capacity takes units of 512 bytes.
-+ */
-+ host->sectors = card->csd.capacity <<
-+ (card->csd.read_blkbits - 9);
-+ }
-+ }
-+
-+ if (!host->dma_desc) {
-+ /* Use PIO */
-+ int 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;
-+ }
-+
-+ bcm2835_sdhost_set_transfer_irqs(host);
-+
-+ bcm2835_sdhost_write(host, data->blksz, SDHBCT);
-+ bcm2835_sdhost_write(host, data->blocks, SDHBLC);
-+
-+ BUG_ON(!host->data);
-+}
-+
-+bool bcm2835_sdhost_send_command(struct bcm2835_host *host,
-+ struct mmc_command *cmd)
-+{
-+ u32 sdcmd, sdhsts;
-+ unsigned long timeout;
-+ int delay;
-+
-+ WARN_ON(host->cmd);
-+ log_event("CMD<", cmd->opcode, cmd->arg);
-+
-+ if (cmd->data)
-+ pr_debug("%s: send_command %d 0x%x "
-+ "(flags 0x%x) - %s %d*%d\n",
-+ mmc_hostname(host->mmc),
-+ cmd->opcode, cmd->arg, cmd->flags,
-+ (cmd->data->flags & MMC_DATA_READ) ?
-+ "read" : "write", cmd->data->blocks,
-+ cmd->data->blksz);
-+ else
-+ pr_debug("%s: send_command %d 0x%x (flags 0x%x)\n",
-+ mmc_hostname(host->mmc),
-+ cmd->opcode, cmd->arg, cmd->flags);
-+
-+ /* Wait max 100 ms */
-+ timeout = 10000;
-+
-+ while (bcm2835_sdhost_read(host, SDCMD) & SDCMD_NEW_FLAG) {
-+ if (timeout == 0) {
-+ pr_warn("%s: previous command never completed.\n",
-+ mmc_hostname(host->mmc));
-+ if (host->debug)
-+ bcm2835_sdhost_dumpregs(host);
-+ cmd->error = -EILSEQ;
-+ tasklet_schedule(&host->finish_tasklet);
-+ return false;
-+ }
-+ timeout--;
-+ udelay(10);
-+ }
-+
-+ delay = (10000 - timeout)/100;
-+ if (delay > host->max_delay) {
-+ host->max_delay = delay;
-+ pr_warning("%s: controller hung for %d ms\n",
-+ mmc_hostname(host->mmc),
-+ host->max_delay);
-+ }
-+
-+ timeout = jiffies;
-+ if (!cmd->data && cmd->busy_timeout > 9000)
-+ timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
-+ else
-+ timeout += 10 * HZ;
-+ mod_timer(&host->timer, timeout);
-+
-+ host->cmd = cmd;
-+
-+ /* Clear any error flags */
-+ sdhsts = bcm2835_sdhost_read(host, SDHSTS);
-+ if (sdhsts & SDHSTS_ERROR_MASK)
-+ bcm2835_sdhost_write(host, sdhsts, SDHSTS);
-+
-+ 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 false;
-+ }
-+
-+ bcm2835_sdhost_prepare_data(host, cmd);
-+
-+ bcm2835_sdhost_write(host, cmd->arg, SDARG);
-+
-+ sdcmd = cmd->opcode & SDCMD_CMD_MASK;
-+
-+ host->use_busy = 0;
-+ 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) {
-+ log_event("CMDD", cmd->data->blocks, cmd->data->blksz);
-+ if (host->delay_after_this_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_this_stop)
-+ udelay(host->delay_after_this_stop -
-+ time_since_stop);
-+ }
-+ }
-+
-+ host->delay_after_this_stop = host->delay_after_stop;
-+ if ((cmd->data->flags & MMC_DATA_READ) && !host->use_sbc) {
-+ /* See if read crosses one of the hazardous sectors */
-+ u32 first_blk, last_blk;
-+
-+ /* Intentionally include the following sector because
-+ without CMD23/SBC the read may run on. */
-+ first_blk = host->mrq->cmd->arg;
-+ last_blk = first_blk + cmd->data->blocks;
-+
-+ if (((last_blk >= (host->sectors - 64)) &&
-+ (first_blk <= (host->sectors - 64))) ||
-+ ((last_blk >= (host->sectors - 32)) &&
-+ (first_blk <= (host->sectors - 32)))) {
-+ host->delay_after_this_stop =
-+ max(250u, host->delay_after_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);
-+
-+ return true;
-+}
-+
-+static void bcm2835_sdhost_finish_command(struct bcm2835_host *host,
-+ unsigned long *irq_flags);
-+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);
-+
-+ log_event("FDA<", (u32)host->mrq, (u32)host->cmd);
-+ 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);
-+
-+ data->bytes_xfered = data->error ? 0 : (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);
-+ log_event("FDA>", (u32)host->mrq, (u32)host->cmd);
-+}
-+
-+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;
-+
-+ log_event("TCM<", (u32)data, data->error);
-+ pr_debug("transfer_complete(error %d, stop %d)\n",
-+ data->error, data->stop ? 1 : 0);
-+
-+ /*
-+ * Need to send CMD12 if -
-+ * a) open-ended multiblock transfer (no CMD23)
-+ * b) error in multiblock transfer
-+ */
-+ if (host->mrq->stop && (data->error || !host->use_sbc)) {
-+ if (bcm2835_sdhost_send_command(host, host->mrq->stop)) {
-+ /* No busy, so poll for completion */
-+ if (!host->use_busy)
-+ bcm2835_sdhost_finish_command(host, NULL);
-+
-+ if (host->delay_after_this_stop)
-+ do_gettimeofday(&host->stop_time);
-+ }
-+ } else {
-+ bcm2835_sdhost_wait_transfer_complete(host);
-+ tasklet_schedule(&host->finish_tasklet);
-+ }
-+ log_event("TCM>", (u32)data, 0);
-+}
-+
-+/* If irq_flags is valid, the caller is in a thread context and is allowed
-+ to sleep */
-+static void bcm2835_sdhost_finish_command(struct bcm2835_host *host,
-+ unsigned long *irq_flags)
-+{
-+ u32 sdcmd;
-+ u32 retries;
-+#ifdef DEBUG
-+ struct timeval before, after;
-+ int timediff = 0;
-+#endif
-+
-+ log_event("FCM<", (u32)host->mrq, (u32)host->cmd);
-+ pr_debug("finish_command(%x)\n", bcm2835_sdhost_read(host, SDCMD));
-+
-+ BUG_ON(!host->cmd || !host->mrq);
-+
-+ /* Poll quickly at first */
-+
-+ retries = host->cmd_quick_poll_retries;
-+ if (!retries) {
-+ /* Work out how many polls take 1us by timing 10us */
-+ struct timeval start, now;
-+ int us_diff;
-+
-+ retries = 1;
-+ do {
-+ int i;
-+
-+ retries *= 2;
-+
-+ do_gettimeofday(&start);
-+
-+ for (i = 0; i < retries; i++) {
-+ cpu_relax();
-+ sdcmd = bcm2835_sdhost_read(host, SDCMD);
-+ }
-+
-+ do_gettimeofday(&now);
-+ us_diff = (now.tv_sec - start.tv_sec) * 1000000 +
-+ (now.tv_usec - start.tv_usec);
-+ } while (us_diff < 10);
-+
-+ host->cmd_quick_poll_retries = ((retries * us_diff + 9)*CMD_DALLY_US)/10 + 1;
-+ retries = 1; // We've already waited long enough this time
-+ }
-+
-+ for (sdcmd = bcm2835_sdhost_read(host, SDCMD);
-+ (sdcmd & SDCMD_NEW_FLAG) && retries;
-+ retries--) {
-+ cpu_relax();
-+ sdcmd = bcm2835_sdhost_read(host, SDCMD);
-+ }
-+
-+ if (!retries) {
-+ unsigned long wait_max;
-+
-+ if (!irq_flags) {
-+ /* Schedule the work */
-+ log_event("CWWQ", 0, 0);
-+ schedule_work(&host->cmd_wait_wq);
-+ return;
-+ }
-+
-+ /* Wait max 100 ms */
-+ wait_max = jiffies + msecs_to_jiffies(100);
-+ while (time_before(jiffies, wait_max)) {
-+ spin_unlock_irqrestore(&host->lock, *irq_flags);
-+ usleep_range(1, 10);
-+ spin_lock_irqsave(&host->lock, *irq_flags);
-+ sdcmd = bcm2835_sdhost_read(host, SDCMD);
-+ if (!(sdcmd & SDCMD_NEW_FLAG))
-+ break;
-+ }
-+ }
-+
-+ /* Check for errors */
-+ if (sdcmd & SDCMD_NEW_FLAG) {
-+ if (host->debug) {
-+ pr_err("%s: command %d never completed.\n",
-+ mmc_hostname(host->mmc), host->cmd->opcode);
-+ bcm2835_sdhost_dumpregs(host);
-+ }
-+ host->cmd->error = -EILSEQ;
-+ tasklet_schedule(&host->finish_tasklet);
-+ return;
-+ } else if (sdcmd & SDCMD_FAIL_FLAG) {
-+ u32 sdhsts = bcm2835_sdhost_read(host, SDHSTS);
-+
-+ /* Clear the errors */
-+ bcm2835_sdhost_write(host, SDHSTS_ERROR_MASK, SDHSTS);
-+
-+ if (host->debug)
-+ pr_info("%s: error detected - CMD %x, HSTS %03x, EDM %x\n",
-+ mmc_hostname(host->mmc), sdcmd, sdhsts,
-+ bcm2835_sdhost_read(host, SDEDM));
-+
-+ if ((sdhsts & SDHSTS_CRC7_ERROR) &&
-+ (host->cmd->opcode == 1)) {
-+ if (host->debug)
-+ pr_info("%s: ignoring CRC7 error for CMD1\n",
-+ mmc_hostname(host->mmc));
-+ } else {
-+ if (sdhsts & SDHSTS_CMD_TIME_OUT) {
-+ if (host->debug)
-+ pr_warn("%s: command %d timeout\n",
-+ mmc_hostname(host->mmc),
-+ host->cmd->opcode);
-+ host->cmd->error = -ETIMEDOUT;
-+ } else {
-+ pr_warn("%s: unexpected command %d error\n",
-+ mmc_hostname(host->mmc),
-+ host->cmd->opcode);
-+ host->cmd->error = -EILSEQ;
-+ }
-+ 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("%s: finish_command %08x %08x %08x %08x\n",
-+ mmc_hostname(host->mmc),
-+ host->cmd->resp[0], host->cmd->resp[1], host->cmd->resp[2], host->cmd->resp[3]);
-+ log_event("RSP ", host->cmd->resp[0], host->cmd->resp[1]);
-+ } else {
-+ host->cmd->resp[0] = bcm2835_sdhost_read(host, SDRSP0);
-+ pr_debug("%s: finish_command %08x\n",
-+ mmc_hostname(host->mmc),
-+ host->cmd->resp[0]);
-+ log_event("RSP ", host->cmd->resp[0], 0);
-+ }
-+ }
-+
-+ if (host->cmd == host->mrq->sbc) {
-+ /* Finished CMD23, now send actual command. */
-+ host->cmd = NULL;
-+ if (bcm2835_sdhost_send_command(host, host->mrq->cmd)) {
-+ if (host->data && host->dma_desc)
-+ /* DMA transfer starts now, PIO starts after irq */
-+ bcm2835_sdhost_start_dma(host);
-+
-+ if (!host->use_busy)
-+ bcm2835_sdhost_finish_command(host, NULL);
-+ }
-+ } 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);
-+ }
-+ log_event("FCM>", (u32)host->mrq, (u32)host->cmd);
-+}
-+
-+static void bcm2835_sdhost_timeout(struct timer_list *t)
-+{
-+ struct bcm2835_host *host = from_timer(host, t, timer);
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&host->lock, flags);
-+ log_event("TIM<", 0, 0);
-+
-+ if (host->mrq) {
-+ pr_err("%s: timeout waiting for hardware interrupt.\n",
-+ mmc_hostname(host->mmc));
-+ log_dump();
-+ 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_busy_irq(struct bcm2835_host *host, u32 intmask)
-+{
-+ log_event("IRQB", (u32)host->cmd, intmask);
-+ 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;
-+ }
-+
-+ 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;
-+ }
-+ host->use_busy = 0;
-+
-+ if (intmask & SDHSTS_ERROR_MASK)
-+ {
-+ pr_err("sdhost_busy_irq: intmask %x, data %p\n", intmask, host->mrq->data);
-+ if (intmask & SDHSTS_CRC7_ERROR)
-+ host->cmd->error = -EILSEQ;
-+ else if (intmask & (SDHSTS_CRC16_ERROR |
-+ SDHSTS_FIFO_ERROR)) {
-+ if (host->mrq->data)
-+ host->mrq->data->error = -EILSEQ;
-+ else
-+ host->cmd->error = -EILSEQ;
-+ } else if (intmask & SDHSTS_REW_TIME_OUT) {
-+ if (host->mrq->data)
-+ host->mrq->data->error = -ETIMEDOUT;
-+ else
-+ host->cmd->error = -ETIMEDOUT;
-+ } else if (intmask & SDHSTS_CMD_TIME_OUT)
-+ host->cmd->error = -ETIMEDOUT;
-+
-+ if (host->debug) {
-+ log_dump();
-+ bcm2835_sdhost_dumpregs(host);
-+ }
-+ }
-+ else
-+ bcm2835_sdhost_finish_command(host, NULL);
-+}
-+
-+static void bcm2835_sdhost_data_irq(struct bcm2835_host *host, u32 intmask)
-+{
-+ /* 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. */
-+ log_event("IRQD", (u32)host->data, intmask);
-+ if (!host->data)
-+ return;
-+
-+ if (intmask & (SDHSTS_CRC16_ERROR |
-+ SDHSTS_FIFO_ERROR |
-+ SDHSTS_REW_TIME_OUT)) {
-+ if (intmask & (SDHSTS_CRC16_ERROR |
-+ SDHSTS_FIFO_ERROR))
-+ host->data->error = -EILSEQ;
-+ else
-+ host->data->error = -ETIMEDOUT;
-+
-+ if (host->debug) {
-+ log_dump();
-+ bcm2835_sdhost_dumpregs(host);
-+ }
-+ }
-+
-+ if (host->data->error) {
-+ bcm2835_sdhost_finish_data(host);
-+ } else if (host->data->flags & MMC_DATA_WRITE) {
-+ /* Use the block interrupt for writes after the first block */
-+ host->hcfg &= ~(SDHCFG_DATA_IRPT_EN);
-+ host->hcfg |= SDHCFG_BLOCK_IRPT_EN;
-+ bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
-+ bcm2835_sdhost_transfer_pio(host);
-+ } else {
-+ bcm2835_sdhost_transfer_pio(host);
-+ host->blocks--;
-+ if ((host->blocks == 0) || host->data->error)
-+ bcm2835_sdhost_finish_data(host);
-+ }
-+}
-+
-+static void bcm2835_sdhost_block_irq(struct bcm2835_host *host, u32 intmask)
-+{
-+ log_event("IRQK", (u32)host->data, intmask);
-+ 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;
-+ }
-+
-+ if (intmask & (SDHSTS_CRC16_ERROR |
-+ SDHSTS_FIFO_ERROR |
-+ SDHSTS_REW_TIME_OUT)) {
-+ if (intmask & (SDHSTS_CRC16_ERROR |
-+ SDHSTS_FIFO_ERROR))
-+ host->data->error = -EILSEQ;
-+ else
-+ host->data->error = -ETIMEDOUT;
-+
-+ if (host->debug) {
-+ log_dump();
-+ bcm2835_sdhost_dumpregs(host);
-+ }
-+ }
-+
-+ if (!host->dma_desc) {
-+ BUG_ON(!host->blocks);
-+ if (host->data->error || (--host->blocks == 0)) {
-+ bcm2835_sdhost_finish_data(host);
-+ } else {
-+ bcm2835_sdhost_transfer_pio(host);
-+ }
-+ } else if (host->data->flags & MMC_DATA_WRITE) {
-+ bcm2835_sdhost_finish_data(host);
-+ }
-+}
-+
-+static irqreturn_t bcm2835_sdhost_irq(int irq, void *dev_id)
-+{
-+ irqreturn_t result = IRQ_NONE;
-+ struct bcm2835_host *host = dev_id;
-+ u32 intmask;
-+
-+ spin_lock(&host->lock);
-+
-+ intmask = bcm2835_sdhost_read(host, SDHSTS);
-+ log_event("IRQ<", intmask, 0);
-+
-+ bcm2835_sdhost_write(host,
-+ SDHSTS_BUSY_IRPT |
-+ SDHSTS_BLOCK_IRPT |
-+ SDHSTS_SDIO_IRPT |
-+ SDHSTS_DATA_FLAG,
-+ SDHSTS);
-+
-+ if (intmask & SDHSTS_BLOCK_IRPT) {
-+ bcm2835_sdhost_block_irq(host, intmask);
-+ result = IRQ_HANDLED;
-+ }
-+
-+ if (intmask & SDHSTS_BUSY_IRPT) {
-+ bcm2835_sdhost_busy_irq(host, intmask);
-+ result = IRQ_HANDLED;
-+ }
-+
-+ /* 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)) {
-+ bcm2835_sdhost_data_irq(host, intmask);
-+ result = IRQ_HANDLED;
-+ }
-+
-+ mmiowb();
-+
-+ log_event("IRQ>", bcm2835_sdhost_read(host, SDHSTS), 0);
-+ spin_unlock(&host->lock);
-+
-+ return result;
-+}
-+
-+void bcm2835_sdhost_set_clock(struct bcm2835_host *host, unsigned int clock)
-+{
-+ int div = 0; /* Initialized for compiler warning */
-+ unsigned int input_clock = clock;
-+ unsigned long flags;
-+
-+ if (host->debug)
-+ pr_info("%s: set_clock(%d)\n", mmc_hostname(host->mmc), clock);
-+
-+ if (host->overclock_50 && (clock == 50*MHZ))
-+ clock = host->overclock_50 * MHZ + (MHZ - 1);
-+
-+ /* 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 (host->firmware_sets_cdiv) {
-+ u32 msg[3] = { clock, 0, 0 };
-+
-+ rpi_firmware_property(rpi_firmware_get(NULL),
-+ RPI_FIRMWARE_SET_SDHOST_CLOCK,
-+ &msg, sizeof(msg));
-+
-+ clock = max(msg[1], msg[2]);
-+ spin_lock_irqsave(&host->lock, flags);
-+ } else {
-+ spin_lock_irqsave(&host->lock, flags);
-+ 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);
-+ mmiowb();
-+ spin_unlock_irqrestore(&host->lock, flags);
-+ 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->cdiv = div;
-+ bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
-+
-+ if (host->debug)
-+ 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,
-+ clock);
-+ }
-+
-+ /* Calibrate some delays */
-+
-+ host->ns_per_fifo_word = (1000000000/clock) *
-+ ((host->mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32);
-+
-+ if (input_clock == 50 * MHZ) {
-+ if (clock > input_clock) {
-+ /* Save the closest value, to make it easier
-+ to reduce in the event of error */
-+ host->overclock_50 = (clock/MHZ);
-+
-+ if (clock != host->overclock) {
-+ pr_info("%s: overclocking to %dHz\n",
-+ mmc_hostname(host->mmc), clock);
-+ host->overclock = clock;
-+ }
-+ } else if (host->overclock) {
-+ host->overclock = 0;
-+ if (clock == 50 * MHZ)
-+ pr_warn("%s: cancelling overclock\n",
-+ mmc_hostname(host->mmc));
-+ }
-+ } else if (input_clock == 0) {
-+ /* Reset the preferred overclock when the clock is stopped.
-+ * This always happens during initialisation. */
-+ host->overclock_50 = host->user_overclock_50;
-+ host->overclock = 0;
-+ }
-+
-+ /* Set the timeout to 500ms */
-+ bcm2835_sdhost_write(host, clock/2, SDTOUT);
-+
-+ host->mmc->actual_clock = clock;
-+ host->clock = input_clock;
-+ host->reset_clock = 0;
-+
-+ mmiowb();
-+ spin_unlock_irqrestore(&host->lock, flags);
-+}
-+
-+static void bcm2835_sdhost_request(struct mmc_host *mmc, struct mmc_request *mrq)
-+{
-+ struct bcm2835_host *host;
-+ unsigned long flags;
-+ u32 edm, fsm;
-+
-+ host = mmc_priv(mmc);
-+
-+ if (host->debug) {
-+ struct mmc_command *cmd = mrq->cmd;
-+ BUG_ON(!cmd);
-+ if (cmd->data)
-+ pr_info("%s: cmd %d 0x%x (flags 0x%x) - %s %d*%d\n",
-+ mmc_hostname(mmc),
-+ cmd->opcode, cmd->arg, cmd->flags,
-+ (cmd->data->flags & MMC_DATA_READ) ?
-+ "read" : "write", cmd->data->blocks,
-+ cmd->data->blksz);
-+ else
-+ pr_info("%s: cmd %d 0x%x (flags 0x%x)\n",
-+ mmc_hostname(mmc),
-+ cmd->opcode, cmd->arg, cmd->flags);
-+ }
-+
-+ /* Reset the error statuses in case this is a retry */
-+ if (mrq->sbc)
-+ mrq->sbc->error = 0;
-+ if (mrq->cmd)
-+ mrq->cmd->error = 0;
-+ if (mrq->data)
-+ mrq->data->error = 0;
-+ if (mrq->stop)
-+ mrq->stop->error = 0;
-+
-+ 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;
-+ }
-+
-+ if (host->use_dma && mrq->data &&
-+ (mrq->data->blocks > host->pio_limit))
-+ bcm2835_sdhost_prepare_dma(host, mrq->data);
-+
-+ if (host->reset_clock)
-+ bcm2835_sdhost_set_clock(host, host->clock);
-+
-+ spin_lock_irqsave(&host->lock, flags);
-+
-+ WARN_ON(host->mrq != NULL);
-+ host->mrq = mrq;
-+
-+ edm = bcm2835_sdhost_read(host, SDEDM);
-+ fsm = edm & SDEDM_FSM_MASK;
-+
-+ log_event("REQ<", (u32)mrq, edm);
-+ if ((fsm != SDEDM_FSM_IDENTMODE) &&
-+ (fsm != SDEDM_FSM_DATAMODE)) {
-+ log_event("REQ!", (u32)mrq, edm);
-+ if (host->debug) {
-+ pr_warn("%s: previous command (%d) not complete (EDM %x)\n",
-+ mmc_hostname(host->mmc),
-+ bcm2835_sdhost_read(host, SDCMD) & SDCMD_CMD_MASK,
-+ edm);
-+ log_dump();
-+ bcm2835_sdhost_dumpregs(host);
-+ }
-+ mrq->cmd->error = -EILSEQ;
-+ tasklet_schedule(&host->finish_tasklet);
-+ mmiowb();
-+ spin_unlock_irqrestore(&host->lock, flags);
-+ return;
-+ }
-+
-+ host->use_sbc = !!mrq->sbc &&
-+ (host->mrq->data->flags & USE_CMD23_FLAGS);
-+ if (host->use_sbc) {
-+ if (bcm2835_sdhost_send_command(host, mrq->sbc)) {
-+ if (!host->use_busy)
-+ bcm2835_sdhost_finish_command(host, &flags);
-+ }
-+ } else if (bcm2835_sdhost_send_command(host, mrq->cmd)) {
-+ if (host->data && host->dma_desc)
-+ /* DMA transfer starts now, PIO starts after irq */
-+ bcm2835_sdhost_start_dma(host);
-+
-+ if (!host->use_busy)
-+ bcm2835_sdhost_finish_command(host, &flags);
-+ }
-+
-+ log_event("CMD ", (u32)mrq->cmd->opcode,
-+ mrq->data ? (u32)mrq->data->blksz : 0);
-+ mmiowb();
-+
-+ log_event("REQ>", (u32)mrq, 0);
-+ spin_unlock_irqrestore(&host->lock, flags);
-+}
-+
-+static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
-+{
-+
-+ struct bcm2835_host *host = mmc_priv(mmc);
-+ unsigned long flags;
-+
-+ if (host->debug)
-+ pr_info("%s: ios clock %d, pwr %d, bus_width %d, "
-+ "timing %d, vdd %d, drv_type %d\n",
-+ mmc_hostname(mmc),
-+ ios->clock, ios->power_mode, ios->bus_width,
-+ ios->timing, ios->signal_voltage, ios->drv_type);
-+
-+ spin_lock_irqsave(&host->lock, flags);
-+
-+ log_event("IOS<", ios->clock, 0);
-+
-+ /* 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);
-+
-+ if (!ios->clock || ios->clock != host->clock)
-+ bcm2835_sdhost_set_clock(host, ios->clock);
-+}
-+
-+static struct mmc_host_ops bcm2835_sdhost_ops = {
-+ .request = bcm2835_sdhost_request,
-+ .set_ios = bcm2835_sdhost_set_ios,
-+ .hw_reset = bcm2835_sdhost_reset,
-+};
-+
-+static void bcm2835_sdhost_cmd_wait_work(struct work_struct *work)
-+{
-+ struct bcm2835_host *host;
-+ unsigned long flags;
-+
-+ host = container_of(work, struct bcm2835_host, cmd_wait_wq);
-+
-+ spin_lock_irqsave(&host->lock, flags);
-+
-+ log_event("CWK<", (u32)host->cmd, (u32)host->mrq);
-+
-+ /*
-+ * 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;
-+ }
-+
-+ bcm2835_sdhost_finish_command(host, &flags);
-+
-+ mmiowb();
-+
-+ log_event("CWK>", (u32)host->cmd, 0);
-+
-+ spin_unlock_irqrestore(&host->lock, flags);
-+}
-+
-+static void bcm2835_sdhost_tasklet_finish(unsigned long param)
-+{
-+ struct bcm2835_host *host;
-+ unsigned long flags;
-+ struct mmc_request *mrq;
-+ struct dma_chan *terminate_chan = NULL;
-+
-+ host = (struct bcm2835_host *)param;
-+
-+ spin_lock_irqsave(&host->lock, flags);
-+
-+ log_event("TSK<", (u32)host->mrq, 0);
-+ /*
-+ * 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;
-+
-+ /* Drop the overclock after any data corruption, or after any
-+ * error while overclocked. Ignore errors for status commands,
-+ * as they are likely when a card is ejected. */
-+ if (host->overclock) {
-+ if ((mrq->cmd && mrq->cmd->error &&
-+ (mrq->cmd->opcode != MMC_SEND_STATUS)) ||
-+ (mrq->data && mrq->data->error) ||
-+ (mrq->stop && mrq->stop->error) ||
-+ (mrq->sbc && mrq->sbc->error)) {
-+ host->overclock_50--;
-+ pr_warn("%s: reducing overclock due to errors\n",
-+ mmc_hostname(host->mmc));
-+ host->reset_clock = 1;
-+ mrq->cmd->error = -ETIMEDOUT;
-+ mrq->cmd->retries = 1;
-+ }
-+ }
-+
-+ host->mrq = NULL;
-+ host->cmd = NULL;
-+ host->data = NULL;
-+
-+ mmiowb();
-+
-+ host->dma_desc = NULL;
-+ terminate_chan = host->dma_chan;
-+ host->dma_chan = NULL;
-+
-+ spin_unlock_irqrestore(&host->lock, flags);
-+
-+ if (terminate_chan)
-+ {
-+ int err = dmaengine_terminate_all(terminate_chan);
-+ if (err)
-+ pr_err("%s: failed to terminate DMA (%d)\n",
-+ mmc_hostname(host->mmc), err);
-+ }
-+
-+ /* The SDHOST block doesn't report any errors for a disconnected
-+ interface. All cards and SDIO devices should report some supported
-+ voltage range, so a zero response to SEND_OP_COND, IO_SEND_OP_COND
-+ or APP_SEND_OP_COND can be treated as an error. */
-+ if (((mrq->cmd->opcode == MMC_SEND_OP_COND) ||
-+ (mrq->cmd->opcode == SD_IO_SEND_OP_COND) ||
-+ (mrq->cmd->opcode == SD_APP_OP_COND)) &&
-+ (mrq->cmd->error == 0) &&
-+ (mrq->cmd->resp[0] == 0)) {
-+ mrq->cmd->error = -ETIMEDOUT;
-+ if (host->debug)
-+ pr_info("%s: faking timeout due to zero OCR\n",
-+ mmc_hostname(host->mmc));
-+ }
-+
-+ mmc_request_done(host->mmc, mrq);
-+ log_event("TSK>", (u32)mrq, 0);
-+}
-+
-+int bcm2835_sdhost_add_host(struct bcm2835_host *host)
-+{
-+ struct mmc_host *mmc;
-+ struct dma_slave_config cfg;
-+ char pio_limit_string[20];
-+ int ret;
-+
-+ mmc = host->mmc;
-+
-+ if (!mmc->f_max || mmc->f_max > host->max_clk)
-+ mmc->f_max = host->max_clk;
-+ mmc->f_min = host->max_clk / SDCDIV_MAX_CDIV;
-+
-+ mmc->max_busy_timeout = (~(unsigned int)0)/(mmc->f_max/1000);
-+
-+ pr_debug("f_max %d, f_min %d, max_busy_timeout %d\n",
-+ mmc->f_max, mmc->f_min, mmc->max_busy_timeout);
-+
-+ /* host controller capabilities */
-+ mmc->caps |=
-+ MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
-+ MMC_CAP_NEEDS_POLL | MMC_CAP_HW_RESET | MMC_CAP_ERASE |
-+ ((ALLOW_CMD23_READ|ALLOW_CMD23_WRITE) * MMC_CAP_CMD23);
-+
-+ spin_lock_init(&host->lock);
-+
-+ if (host->allow_dma) {
-+ if (IS_ERR_OR_NULL(host->dma_chan_rxtx)) {
-+ pr_err("%s: unable to initialise DMA channel. "
-+ "Falling back to PIO\n",
-+ mmc_hostname(mmc));
-+ host->use_dma = false;
-+ } else {
-+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-+ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-+ cfg.slave_id = 13; /* DREQ channel */
-+
-+ /* Validate the slave configurations */
-+
-+ cfg.direction = DMA_MEM_TO_DEV;
-+ cfg.src_addr = 0;
-+ cfg.dst_addr = host->bus_addr + SDDATA;
-+
-+ ret = dmaengine_slave_config(host->dma_chan_rxtx, &cfg);
-+
-+ if (ret == 0) {
-+ host->dma_cfg_tx = cfg;
-+
-+ cfg.direction = DMA_DEV_TO_MEM;
-+ cfg.src_addr = host->bus_addr + SDDATA;
-+ cfg.dst_addr = 0;
-+
-+ ret = dmaengine_slave_config(host->dma_chan_rxtx, &cfg);
-+ }
-+
-+ if (ret == 0) {
-+ host->dma_cfg_rx = cfg;
-+
-+ host->use_dma = true;
-+ } else {
-+ pr_err("%s: unable to configure DMA channel. "
-+ "Falling back to PIO\n",
-+ mmc_hostname(mmc));
-+ dma_release_channel(host->dma_chan_rxtx);
-+ host->dma_chan_rxtx = NULL;
-+ host->use_dma = false;
-+ }
-+ }
-+ } else {
-+ host->use_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);
-+
-+ INIT_WORK(&host->cmd_wait_wq, bcm2835_sdhost_cmd_wait_work);
-+
-+ timer_setup(&host->timer, bcm2835_sdhost_timeout, 0);
-+
-+ bcm2835_sdhost_init(host, 0);
-+
-+ ret = request_irq(host->irq, bcm2835_sdhost_irq, 0 /*IRQF_SHARED*/,
-+ mmc_hostname(mmc), host);
-+ 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);
-+
-+ pio_limit_string[0] = '\0';
-+ if (host->use_dma && (host->pio_limit > 0))
-+ sprintf(pio_limit_string, " (>%d)", host->pio_limit);
-+ pr_info("%s: %s loaded - DMA %s%s\n",
-+ mmc_hostname(mmc), DRIVER_NAME,
-+ host->use_dma ? "enabled" : "disabled",
-+ pio_limit_string);
-+
-+ 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;
-+ const __be32 *addr;
-+ u32 msg[3];
-+ 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->pio_timeout = msecs_to_jiffies(500);
-+ host->pio_limit = 1;
-+ host->max_delay = 1; /* Warn if over 1ms */
-+ host->allow_dma = 1;
-+ 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;
-+ }
-+
-+ addr = of_get_address(node, 0, NULL, NULL);
-+ if (!addr) {
-+ dev_err(dev, "could not get DMA-register address\n");
-+ return -ENODEV;
-+ }
-+ host->bus_addr = be32_to_cpup(addr);
-+ pr_debug(" - ioaddr %lx, iomem->start %lx, bus_addr %lx\n",
-+ (unsigned long)host->ioaddr,
-+ (unsigned long)iomem->start,
-+ (unsigned long)host->bus_addr);
-+
-+ 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->user_overclock_50);
-+ of_property_read_u32(node,
-+ "brcm,pio-limit",
-+ &host->pio_limit);
-+ host->allow_dma =
-+ !of_property_read_bool(node, "brcm,force-pio");
-+ host->debug = of_property_read_bool(node, "brcm,debug");
-+ }
-+
-+ host->dma_chan = NULL;
-+ host->dma_desc = NULL;
-+
-+ /* Formally recognise the other way of disabling DMA */
-+ if (host->pio_limit == 0x7fffffff)
-+ host->allow_dma = false;
-+
-+ if (host->allow_dma) {
-+ if (node) {
-+ host->dma_chan_rxtx =
-+ dma_request_slave_channel(dev, "rx-tx");
-+ if (!host->dma_chan_rxtx)
-+ host->dma_chan_rxtx =
-+ dma_request_slave_channel(dev, "tx");
-+ if (!host->dma_chan_rxtx)
-+ host->dma_chan_rxtx =
-+ 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_rxtx =
-+ dma_request_channel(mask, NULL, NULL);
-+ }
-+ }
-+
-+ clk = devm_clk_get(dev, NULL);
-+ if (IS_ERR(clk)) {
-+ ret = PTR_ERR(clk);
-+ if (ret == -EPROBE_DEFER)
-+ dev_info(dev, "could not get clk, deferring probe\n");
-+ else
-+ dev_err(dev, "could not get clk\n");
-+ 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);
-+
-+ log_init(dev, iomem->start - host->bus_addr);
-+
-+ if (node)
-+ mmc_of_parse(mmc);
-+ else
-+ mmc->caps |= MMC_CAP_4_BIT_DATA;
-+
-+ msg[0] = 0;
-+ msg[1] = ~0;
-+ msg[2] = ~0;
-+
-+ rpi_firmware_property(rpi_firmware_get(NULL),
-+ RPI_FIRMWARE_SET_SDHOST_CLOCK,
-+ &msg, sizeof(msg));
-+
-+ host->firmware_sets_cdiv = (msg[1] != ~0);
-+
-+ 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");
projects / openwrt / openwrt.git / blobdiff