diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0041-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0041-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch | 2401 |
1 files changed, 0 insertions, 2401 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0041-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch b/target/linux/brcm2708/patches-4.14/950-0041-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch deleted file mode 100644 index 86e0e2e9c7..0000000000 --- a/target/linux/brcm2708/patches-4.14/950-0041-Adding-bcm2835-sdhost-driver-and-an-overlay-to-enabl.patch +++ /dev/null @@ -1,2401 +0,0 @@ -From f6ef8b1ebd154b65626191b38ca2cde8274d3ecd Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.org> -Date: Wed, 25 Mar 2015 17:49:47 +0000 -Subject: [PATCH 041/454] 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> ---- - drivers/mmc/host/Kconfig | 10 + - drivers/mmc/host/Makefile | 1 + - drivers/mmc/host/bcm2835-sdhost.c | 2193 +++++++++++++++++++++++++++++ - 3 files changed, 2204 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 -@@ -21,6 +21,7 @@ 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 +1,2193 @@ -+/* -+ * 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 <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(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"); |