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authorÁlvaro Fernández Rojas <noltari@gmail.com>2017-02-07 21:07:54 +0100
committerÁlvaro Fernández Rojas <noltari@gmail.com>2017-02-07 23:00:16 +0100
commit96aa0c6b0b179518e0c228362ea55f1c7793bb3a (patch)
tree3244114239a7bbf380ee9fa76680b55e459e06c0 /target/linux/brcm2708/patches-4.9/0035-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch
parent6b5c3fd055f64ce0f9d111820123caf33632a51f (diff)
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brcm2708: add linux 4.9 support
Patches from Raspberry Pi repo: https://github.com/raspberrypi/linux/commits/rpi-4.9.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Diffstat (limited to 'target/linux/brcm2708/patches-4.9/0035-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch')
-rw-r--r--target/linux/brcm2708/patches-4.9/0035-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch2399
1 files changed, 2399 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.9/0035-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch b/target/linux/brcm2708/patches-4.9/0035-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch
new file mode 100644
index 0000000000..c6ceef081a
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.9/0035-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch
@@ -0,0 +1,2399 @@
+From 3d0f0b3db1b62e5d913517ce305913cc71803ef1 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>
+---
+ drivers/mmc/host/Kconfig | 12 +-
+ drivers/mmc/host/Makefile | 1 +
+ drivers/mmc/host/bcm2835-sdhost.c | 2189 +++++++++++++++++++++++++++++++++++++
+ 3 files changed, 2201 insertions(+), 1 deletion(-)
+ create mode 100644 drivers/mmc/host/bcm2835-sdhost.c
+
+--- a/drivers/mmc/host/Kconfig
++++ b/drivers/mmc/host/Kconfig
+@@ -6,7 +6,7 @@ comment "MMC/SD/SDIO Host Controller Dri
+
+ config MMC_BCM2835
+ tristate "MMC support on BCM2835"
+- depends on MACH_BCM2708 || MACH_BCM2709 || ARCH_BCM2835
++ depends on ARCH_BCM2835
+ help
+ This selects the MMC Interface on BCM2835.
+
+@@ -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_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 +1,2189 @@
++/*
++ * 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 <soc/bcm2835/raspberrypi-firmware.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(unsigned long data)
++{
++ struct bcm2835_host *host;
++ unsigned long flags;
++
++ host = (struct bcm2835_host *)data;
++
++ 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 > 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;
++
++ 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);
++
++ setup_timer(&host->timer, bcm2835_sdhost_timeout,
++ (unsigned long)host);
++
++ 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");