forked from Minki/linux
9cda3e7ceb
The BCM2835 MMC host driver sets the device's driver data pointer to NULL on ->remove() even though the driver core subsequently does the same in __device_release_driver(). Drop the duplicate assignment. Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Lukas Wunner <lukas@wunner.de> Cc: Frank Pavlic <f.pavlic@kunbus.de> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
1482 lines
37 KiB
C
1482 lines
37 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* bcm2835 sdhost driver.
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*
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* The 2835 has two SD controllers: The Arasan sdhci controller
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* (supported by the iproc driver) and a custom sdhost controller
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* (supported by this driver).
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*
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* The sdhci controller supports both sdcard and sdio. The sdhost
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* controller supports the sdcard only, but has better performance.
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* Also note that the rpi3 has sdio wifi, so driving the sdcard with
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* the sdhost controller allows to use the sdhci controller for wifi
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* support.
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*
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* The configuration is done by devicetree via pin muxing. Both
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* SD controller are available on the same pins (2 pin groups = pin 22
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* to 27 + pin 48 to 53). So it's possible to use both SD controllers
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* at the same time with different pin groups.
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*
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* Author: Phil Elwell <phil@raspberrypi.org>
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* Copyright (C) 2015-2016 Raspberry Pi (Trading) Ltd.
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*
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* Based on
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* mmc-bcm2835.c by Gellert Weisz
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* which is, in turn, based on
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* sdhci-bcm2708.c by Broadcom
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* sdhci-bcm2835.c by Stephen Warren and Oleksandr Tymoshenko
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* sdhci.c and sdhci-pci.c by Pierre Ossman
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/highmem.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/platform_device.h>
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#include <linux/scatterlist.h>
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#include <linux/time.h>
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#include <linux/workqueue.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/sd.h>
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#define SDCMD 0x00 /* Command to SD card - 16 R/W */
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#define SDARG 0x04 /* Argument to SD card - 32 R/W */
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#define SDTOUT 0x08 /* Start value for timeout counter - 32 R/W */
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#define SDCDIV 0x0c /* Start value for clock divider - 11 R/W */
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#define SDRSP0 0x10 /* SD card response (31:0) - 32 R */
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#define SDRSP1 0x14 /* SD card response (63:32) - 32 R */
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#define SDRSP2 0x18 /* SD card response (95:64) - 32 R */
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#define SDRSP3 0x1c /* SD card response (127:96) - 32 R */
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#define SDHSTS 0x20 /* SD host status - 11 R/W */
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#define SDVDD 0x30 /* SD card power control - 1 R/W */
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#define SDEDM 0x34 /* Emergency Debug Mode - 13 R/W */
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#define SDHCFG 0x38 /* Host configuration - 2 R/W */
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#define SDHBCT 0x3c /* Host byte count (debug) - 32 R/W */
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#define SDDATA 0x40 /* Data to/from SD card - 32 R/W */
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#define SDHBLC 0x50 /* Host block count (SDIO/SDHC) - 9 R/W */
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#define SDCMD_NEW_FLAG 0x8000
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#define SDCMD_FAIL_FLAG 0x4000
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#define SDCMD_BUSYWAIT 0x800
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#define SDCMD_NO_RESPONSE 0x400
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#define SDCMD_LONG_RESPONSE 0x200
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#define SDCMD_WRITE_CMD 0x80
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#define SDCMD_READ_CMD 0x40
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#define SDCMD_CMD_MASK 0x3f
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#define SDCDIV_MAX_CDIV 0x7ff
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#define SDHSTS_BUSY_IRPT 0x400
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#define SDHSTS_BLOCK_IRPT 0x200
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#define SDHSTS_SDIO_IRPT 0x100
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#define SDHSTS_REW_TIME_OUT 0x80
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#define SDHSTS_CMD_TIME_OUT 0x40
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#define SDHSTS_CRC16_ERROR 0x20
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#define SDHSTS_CRC7_ERROR 0x10
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#define SDHSTS_FIFO_ERROR 0x08
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/* Reserved */
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/* Reserved */
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#define SDHSTS_DATA_FLAG 0x01
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#define SDHSTS_TRANSFER_ERROR_MASK (SDHSTS_CRC7_ERROR | \
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SDHSTS_CRC16_ERROR | \
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SDHSTS_REW_TIME_OUT | \
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SDHSTS_FIFO_ERROR)
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#define SDHSTS_ERROR_MASK (SDHSTS_CMD_TIME_OUT | \
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SDHSTS_TRANSFER_ERROR_MASK)
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#define SDHCFG_BUSY_IRPT_EN BIT(10)
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#define SDHCFG_BLOCK_IRPT_EN BIT(8)
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#define SDHCFG_SDIO_IRPT_EN BIT(5)
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#define SDHCFG_DATA_IRPT_EN BIT(4)
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#define SDHCFG_SLOW_CARD BIT(3)
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#define SDHCFG_WIDE_EXT_BUS BIT(2)
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#define SDHCFG_WIDE_INT_BUS BIT(1)
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#define SDHCFG_REL_CMD_LINE BIT(0)
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#define SDVDD_POWER_OFF 0
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#define SDVDD_POWER_ON 1
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#define SDEDM_FORCE_DATA_MODE BIT(19)
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#define SDEDM_CLOCK_PULSE BIT(20)
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#define SDEDM_BYPASS BIT(21)
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#define SDEDM_WRITE_THRESHOLD_SHIFT 9
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#define SDEDM_READ_THRESHOLD_SHIFT 14
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#define SDEDM_THRESHOLD_MASK 0x1f
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#define SDEDM_FSM_MASK 0xf
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#define SDEDM_FSM_IDENTMODE 0x0
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#define SDEDM_FSM_DATAMODE 0x1
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#define SDEDM_FSM_READDATA 0x2
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#define SDEDM_FSM_WRITEDATA 0x3
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#define SDEDM_FSM_READWAIT 0x4
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#define SDEDM_FSM_READCRC 0x5
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#define SDEDM_FSM_WRITECRC 0x6
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#define SDEDM_FSM_WRITEWAIT1 0x7
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#define SDEDM_FSM_POWERDOWN 0x8
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#define SDEDM_FSM_POWERUP 0x9
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#define SDEDM_FSM_WRITESTART1 0xa
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#define SDEDM_FSM_WRITESTART2 0xb
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#define SDEDM_FSM_GENPULSES 0xc
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#define SDEDM_FSM_WRITEWAIT2 0xd
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#define SDEDM_FSM_STARTPOWDOWN 0xf
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#define SDDATA_FIFO_WORDS 16
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#define FIFO_READ_THRESHOLD 4
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#define FIFO_WRITE_THRESHOLD 4
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#define SDDATA_FIFO_PIO_BURST 8
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#define PIO_THRESHOLD 1 /* Maximum block count for PIO (0 = always DMA) */
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struct bcm2835_host {
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spinlock_t lock;
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struct mutex mutex;
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void __iomem *ioaddr;
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u32 phys_addr;
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struct platform_device *pdev;
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int clock; /* Current clock speed */
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unsigned int max_clk; /* Max possible freq */
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struct work_struct dma_work;
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struct delayed_work timeout_work; /* Timer for timeouts */
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struct sg_mapping_iter sg_miter; /* SG state for PIO */
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unsigned int blocks; /* remaining PIO blocks */
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int irq; /* Device IRQ */
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u32 ns_per_fifo_word;
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/* cached registers */
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u32 hcfg;
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u32 cdiv;
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struct mmc_request *mrq; /* Current request */
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struct mmc_command *cmd; /* Current command */
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struct mmc_data *data; /* Current data request */
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bool data_complete:1;/* Data finished before cmd */
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bool use_busy:1; /* Wait for busy interrupt */
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bool use_sbc:1; /* Send CMD23 */
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/* for threaded irq handler */
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bool irq_block;
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bool irq_busy;
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bool irq_data;
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/* DMA part */
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struct dma_chan *dma_chan_rxtx;
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struct dma_chan *dma_chan;
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struct dma_slave_config dma_cfg_rx;
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struct dma_slave_config dma_cfg_tx;
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struct dma_async_tx_descriptor *dma_desc;
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u32 dma_dir;
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u32 drain_words;
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struct page *drain_page;
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u32 drain_offset;
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bool use_dma;
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};
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static void bcm2835_dumpcmd(struct bcm2835_host *host, struct mmc_command *cmd,
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const char *label)
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{
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struct device *dev = &host->pdev->dev;
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if (!cmd)
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return;
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dev_dbg(dev, "%c%s op %d arg 0x%x flags 0x%x - resp %08x %08x %08x %08x, err %d\n",
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(cmd == host->cmd) ? '>' : ' ',
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label, cmd->opcode, cmd->arg, cmd->flags,
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cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3],
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cmd->error);
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}
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static void bcm2835_dumpregs(struct bcm2835_host *host)
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{
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struct mmc_request *mrq = host->mrq;
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struct device *dev = &host->pdev->dev;
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if (mrq) {
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bcm2835_dumpcmd(host, mrq->sbc, "sbc");
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bcm2835_dumpcmd(host, mrq->cmd, "cmd");
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if (mrq->data) {
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dev_dbg(dev, "data blocks %x blksz %x - err %d\n",
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mrq->data->blocks,
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mrq->data->blksz,
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mrq->data->error);
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}
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bcm2835_dumpcmd(host, mrq->stop, "stop");
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}
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dev_dbg(dev, "=========== REGISTER DUMP ===========\n");
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dev_dbg(dev, "SDCMD 0x%08x\n", readl(host->ioaddr + SDCMD));
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dev_dbg(dev, "SDARG 0x%08x\n", readl(host->ioaddr + SDARG));
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dev_dbg(dev, "SDTOUT 0x%08x\n", readl(host->ioaddr + SDTOUT));
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dev_dbg(dev, "SDCDIV 0x%08x\n", readl(host->ioaddr + SDCDIV));
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dev_dbg(dev, "SDRSP0 0x%08x\n", readl(host->ioaddr + SDRSP0));
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dev_dbg(dev, "SDRSP1 0x%08x\n", readl(host->ioaddr + SDRSP1));
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dev_dbg(dev, "SDRSP2 0x%08x\n", readl(host->ioaddr + SDRSP2));
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dev_dbg(dev, "SDRSP3 0x%08x\n", readl(host->ioaddr + SDRSP3));
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dev_dbg(dev, "SDHSTS 0x%08x\n", readl(host->ioaddr + SDHSTS));
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dev_dbg(dev, "SDVDD 0x%08x\n", readl(host->ioaddr + SDVDD));
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dev_dbg(dev, "SDEDM 0x%08x\n", readl(host->ioaddr + SDEDM));
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dev_dbg(dev, "SDHCFG 0x%08x\n", readl(host->ioaddr + SDHCFG));
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dev_dbg(dev, "SDHBCT 0x%08x\n", readl(host->ioaddr + SDHBCT));
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dev_dbg(dev, "SDHBLC 0x%08x\n", readl(host->ioaddr + SDHBLC));
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dev_dbg(dev, "===========================================\n");
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}
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static void bcm2835_reset_internal(struct bcm2835_host *host)
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{
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u32 temp;
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writel(SDVDD_POWER_OFF, host->ioaddr + SDVDD);
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writel(0, host->ioaddr + SDCMD);
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writel(0, host->ioaddr + SDARG);
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writel(0xf00000, host->ioaddr + SDTOUT);
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writel(0, host->ioaddr + SDCDIV);
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writel(0x7f8, host->ioaddr + SDHSTS); /* Write 1s to clear */
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writel(0, host->ioaddr + SDHCFG);
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writel(0, host->ioaddr + SDHBCT);
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writel(0, host->ioaddr + SDHBLC);
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/* Limit fifo usage due to silicon bug */
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temp = readl(host->ioaddr + SDEDM);
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temp &= ~((SDEDM_THRESHOLD_MASK << SDEDM_READ_THRESHOLD_SHIFT) |
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(SDEDM_THRESHOLD_MASK << SDEDM_WRITE_THRESHOLD_SHIFT));
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temp |= (FIFO_READ_THRESHOLD << SDEDM_READ_THRESHOLD_SHIFT) |
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(FIFO_WRITE_THRESHOLD << SDEDM_WRITE_THRESHOLD_SHIFT);
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writel(temp, host->ioaddr + SDEDM);
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msleep(20);
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writel(SDVDD_POWER_ON, host->ioaddr + SDVDD);
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msleep(20);
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host->clock = 0;
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writel(host->hcfg, host->ioaddr + SDHCFG);
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writel(host->cdiv, host->ioaddr + SDCDIV);
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}
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static void bcm2835_reset(struct mmc_host *mmc)
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{
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struct bcm2835_host *host = mmc_priv(mmc);
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if (host->dma_chan)
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dmaengine_terminate_sync(host->dma_chan);
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host->dma_chan = NULL;
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bcm2835_reset_internal(host);
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}
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static void bcm2835_finish_command(struct bcm2835_host *host);
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static void bcm2835_wait_transfer_complete(struct bcm2835_host *host)
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{
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int timediff;
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u32 alternate_idle;
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alternate_idle = (host->mrq->data->flags & MMC_DATA_READ) ?
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SDEDM_FSM_READWAIT : SDEDM_FSM_WRITESTART1;
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timediff = 0;
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while (1) {
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u32 edm, fsm;
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edm = readl(host->ioaddr + SDEDM);
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fsm = edm & SDEDM_FSM_MASK;
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if ((fsm == SDEDM_FSM_IDENTMODE) ||
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(fsm == SDEDM_FSM_DATAMODE))
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break;
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if (fsm == alternate_idle) {
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writel(edm | SDEDM_FORCE_DATA_MODE,
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host->ioaddr + SDEDM);
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break;
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}
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timediff++;
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if (timediff == 100000) {
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dev_err(&host->pdev->dev,
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"wait_transfer_complete - still waiting after %d retries\n",
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timediff);
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bcm2835_dumpregs(host);
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host->mrq->data->error = -ETIMEDOUT;
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return;
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}
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cpu_relax();
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}
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}
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static void bcm2835_dma_complete(void *param)
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{
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struct bcm2835_host *host = param;
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schedule_work(&host->dma_work);
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}
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static void bcm2835_transfer_block_pio(struct bcm2835_host *host, bool is_read)
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{
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unsigned long flags;
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size_t blksize;
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unsigned long wait_max;
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blksize = host->data->blksz;
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wait_max = jiffies + msecs_to_jiffies(500);
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local_irq_save(flags);
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while (blksize) {
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int copy_words;
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u32 hsts = 0;
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size_t len;
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u32 *buf;
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if (!sg_miter_next(&host->sg_miter)) {
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host->data->error = -EINVAL;
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break;
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}
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len = min(host->sg_miter.length, blksize);
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if (len % 4) {
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host->data->error = -EINVAL;
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break;
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}
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blksize -= len;
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host->sg_miter.consumed = len;
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buf = (u32 *)host->sg_miter.addr;
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copy_words = len / 4;
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while (copy_words) {
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int burst_words, words;
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u32 edm;
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burst_words = min(SDDATA_FIFO_PIO_BURST, copy_words);
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edm = readl(host->ioaddr + SDEDM);
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if (is_read)
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words = ((edm >> 4) & 0x1f);
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else
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words = SDDATA_FIFO_WORDS - ((edm >> 4) & 0x1f);
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if (words < burst_words) {
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int fsm_state = (edm & SDEDM_FSM_MASK);
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struct device *dev = &host->pdev->dev;
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if ((is_read &&
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(fsm_state != SDEDM_FSM_READDATA &&
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fsm_state != SDEDM_FSM_READWAIT &&
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fsm_state != SDEDM_FSM_READCRC)) ||
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(!is_read &&
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(fsm_state != SDEDM_FSM_WRITEDATA &&
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fsm_state != SDEDM_FSM_WRITESTART1 &&
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fsm_state != SDEDM_FSM_WRITESTART2))) {
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hsts = readl(host->ioaddr + SDHSTS);
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dev_err(dev, "fsm %x, hsts %08x\n",
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fsm_state, hsts);
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if (hsts & SDHSTS_ERROR_MASK)
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break;
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}
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if (time_after(jiffies, wait_max)) {
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dev_err(dev, "PIO %s timeout - EDM %08x\n",
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is_read ? "read" : "write",
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edm);
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hsts = SDHSTS_REW_TIME_OUT;
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break;
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}
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ndelay((burst_words - words) *
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host->ns_per_fifo_word);
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continue;
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} else if (words > copy_words) {
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words = copy_words;
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}
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copy_words -= words;
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while (words) {
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if (is_read)
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*(buf++) = readl(host->ioaddr + SDDATA);
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else
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writel(*(buf++), host->ioaddr + SDDATA);
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words--;
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}
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}
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if (hsts & SDHSTS_ERROR_MASK)
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break;
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}
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sg_miter_stop(&host->sg_miter);
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local_irq_restore(flags);
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}
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static void bcm2835_transfer_pio(struct bcm2835_host *host)
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{
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struct device *dev = &host->pdev->dev;
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u32 sdhsts;
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bool is_read;
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is_read = (host->data->flags & MMC_DATA_READ) != 0;
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bcm2835_transfer_block_pio(host, is_read);
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sdhsts = readl(host->ioaddr + SDHSTS);
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if (sdhsts & (SDHSTS_CRC16_ERROR |
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SDHSTS_CRC7_ERROR |
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SDHSTS_FIFO_ERROR)) {
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dev_err(dev, "%s transfer error - HSTS %08x\n",
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is_read ? "read" : "write", sdhsts);
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host->data->error = -EILSEQ;
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} else if ((sdhsts & (SDHSTS_CMD_TIME_OUT |
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SDHSTS_REW_TIME_OUT))) {
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dev_err(dev, "%s timeout error - HSTS %08x\n",
|
|
is_read ? "read" : "write", sdhsts);
|
|
host->data->error = -ETIMEDOUT;
|
|
}
|
|
}
|
|
|
|
static
|
|
void bcm2835_prepare_dma(struct bcm2835_host *host, struct mmc_data *data)
|
|
{
|
|
int sg_len, dir_data, dir_slave;
|
|
struct dma_async_tx_descriptor *desc = NULL;
|
|
struct dma_chan *dma_chan;
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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)) {
|
|
WARN_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);
|
|
|
|
sg_len = dma_map_sg(dma_chan->device->dev, data->sg, data->sg_len,
|
|
dir_data);
|
|
if (!sg_len)
|
|
return;
|
|
|
|
desc = dmaengine_prep_slave_sg(dma_chan, data->sg, sg_len, dir_slave,
|
|
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
|
|
|
|
if (!desc) {
|
|
dma_unmap_sg(dma_chan->device->dev, data->sg, sg_len, dir_data);
|
|
return;
|
|
}
|
|
|
|
desc->callback = bcm2835_dma_complete;
|
|
desc->callback_param = host;
|
|
host->dma_desc = desc;
|
|
host->dma_chan = dma_chan;
|
|
host->dma_dir = dir_data;
|
|
}
|
|
|
|
static void bcm2835_start_dma(struct bcm2835_host *host)
|
|
{
|
|
dmaengine_submit(host->dma_desc);
|
|
dma_async_issue_pending(host->dma_chan);
|
|
}
|
|
|
|
static void bcm2835_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;
|
|
}
|
|
|
|
writel(host->hcfg, host->ioaddr + SDHCFG);
|
|
}
|
|
|
|
static
|
|
void bcm2835_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;
|
|
|
|
host->data_complete = false;
|
|
host->data->bytes_xfered = 0;
|
|
|
|
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_set_transfer_irqs(host);
|
|
|
|
writel(data->blksz, host->ioaddr + SDHBCT);
|
|
writel(data->blocks, host->ioaddr + SDHBLC);
|
|
}
|
|
|
|
static u32 bcm2835_read_wait_sdcmd(struct bcm2835_host *host, u32 max_ms)
|
|
{
|
|
struct device *dev = &host->pdev->dev;
|
|
u32 value;
|
|
int ret;
|
|
|
|
ret = readl_poll_timeout(host->ioaddr + SDCMD, value,
|
|
!(value & SDCMD_NEW_FLAG), 1, 10);
|
|
if (ret == -ETIMEDOUT)
|
|
/* if it takes a while make poll interval bigger */
|
|
ret = readl_poll_timeout(host->ioaddr + SDCMD, value,
|
|
!(value & SDCMD_NEW_FLAG),
|
|
10, max_ms * 1000);
|
|
if (ret == -ETIMEDOUT)
|
|
dev_err(dev, "%s: timeout (%d ms)\n", __func__, max_ms);
|
|
|
|
return value;
|
|
}
|
|
|
|
static void bcm2835_finish_request(struct bcm2835_host *host)
|
|
{
|
|
struct dma_chan *terminate_chan = NULL;
|
|
struct mmc_request *mrq;
|
|
|
|
cancel_delayed_work_sync(&host->timeout_work);
|
|
|
|
mrq = host->mrq;
|
|
|
|
host->mrq = NULL;
|
|
host->cmd = NULL;
|
|
host->data = NULL;
|
|
|
|
host->dma_desc = NULL;
|
|
terminate_chan = host->dma_chan;
|
|
host->dma_chan = NULL;
|
|
|
|
if (terminate_chan) {
|
|
int err = dmaengine_terminate_all(terminate_chan);
|
|
|
|
if (err)
|
|
dev_err(&host->pdev->dev,
|
|
"failed to terminate DMA (%d)\n", err);
|
|
}
|
|
|
|
mmc_request_done(mmc_from_priv(host), mrq);
|
|
}
|
|
|
|
static
|
|
bool bcm2835_send_command(struct bcm2835_host *host, struct mmc_command *cmd)
|
|
{
|
|
struct device *dev = &host->pdev->dev;
|
|
u32 sdcmd, sdhsts;
|
|
unsigned long timeout;
|
|
|
|
WARN_ON(host->cmd);
|
|
|
|
sdcmd = bcm2835_read_wait_sdcmd(host, 100);
|
|
if (sdcmd & SDCMD_NEW_FLAG) {
|
|
dev_err(dev, "previous command never completed.\n");
|
|
bcm2835_dumpregs(host);
|
|
cmd->error = -EILSEQ;
|
|
bcm2835_finish_request(host);
|
|
return false;
|
|
}
|
|
|
|
if (!cmd->data && cmd->busy_timeout > 9000)
|
|
timeout = DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
|
|
else
|
|
timeout = 10 * HZ;
|
|
schedule_delayed_work(&host->timeout_work, timeout);
|
|
|
|
host->cmd = cmd;
|
|
|
|
/* Clear any error flags */
|
|
sdhsts = readl(host->ioaddr + SDHSTS);
|
|
if (sdhsts & SDHSTS_ERROR_MASK)
|
|
writel(sdhsts, host->ioaddr + SDHSTS);
|
|
|
|
if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
|
|
dev_err(dev, "unsupported response type!\n");
|
|
cmd->error = -EINVAL;
|
|
bcm2835_finish_request(host);
|
|
return false;
|
|
}
|
|
|
|
bcm2835_prepare_data(host, cmd);
|
|
|
|
writel(cmd->arg, host->ioaddr + SDARG);
|
|
|
|
sdcmd = cmd->opcode & SDCMD_CMD_MASK;
|
|
|
|
host->use_busy = false;
|
|
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 = true;
|
|
}
|
|
}
|
|
|
|
if (cmd->data) {
|
|
if (cmd->data->flags & MMC_DATA_WRITE)
|
|
sdcmd |= SDCMD_WRITE_CMD;
|
|
if (cmd->data->flags & MMC_DATA_READ)
|
|
sdcmd |= SDCMD_READ_CMD;
|
|
}
|
|
|
|
writel(sdcmd | SDCMD_NEW_FLAG, host->ioaddr + SDCMD);
|
|
|
|
return true;
|
|
}
|
|
|
|
static void bcm2835_transfer_complete(struct bcm2835_host *host)
|
|
{
|
|
struct mmc_data *data;
|
|
|
|
WARN_ON(!host->data_complete);
|
|
|
|
data = host->data;
|
|
host->data = NULL;
|
|
|
|
/* 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_send_command(host, host->mrq->stop)) {
|
|
/* No busy, so poll for completion */
|
|
if (!host->use_busy)
|
|
bcm2835_finish_command(host);
|
|
}
|
|
} else {
|
|
bcm2835_wait_transfer_complete(host);
|
|
bcm2835_finish_request(host);
|
|
}
|
|
}
|
|
|
|
static void bcm2835_finish_data(struct bcm2835_host *host)
|
|
{
|
|
struct device *dev = &host->pdev->dev;
|
|
struct mmc_data *data;
|
|
|
|
data = host->data;
|
|
|
|
host->hcfg &= ~(SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN);
|
|
writel(host->hcfg, host->ioaddr + SDHCFG);
|
|
|
|
data->bytes_xfered = data->error ? 0 : (data->blksz * data->blocks);
|
|
|
|
host->data_complete = true;
|
|
|
|
if (host->cmd) {
|
|
/* Data managed to finish before the
|
|
* command completed. Make sure we do
|
|
* things in the proper order.
|
|
*/
|
|
dev_dbg(dev, "Finished early - HSTS %08x\n",
|
|
readl(host->ioaddr + SDHSTS));
|
|
} else {
|
|
bcm2835_transfer_complete(host);
|
|
}
|
|
}
|
|
|
|
static void bcm2835_finish_command(struct bcm2835_host *host)
|
|
{
|
|
struct device *dev = &host->pdev->dev;
|
|
struct mmc_command *cmd = host->cmd;
|
|
u32 sdcmd;
|
|
|
|
sdcmd = bcm2835_read_wait_sdcmd(host, 100);
|
|
|
|
/* Check for errors */
|
|
if (sdcmd & SDCMD_NEW_FLAG) {
|
|
dev_err(dev, "command never completed.\n");
|
|
bcm2835_dumpregs(host);
|
|
host->cmd->error = -EIO;
|
|
bcm2835_finish_request(host);
|
|
return;
|
|
} else if (sdcmd & SDCMD_FAIL_FLAG) {
|
|
u32 sdhsts = readl(host->ioaddr + SDHSTS);
|
|
|
|
/* Clear the errors */
|
|
writel(SDHSTS_ERROR_MASK, host->ioaddr + SDHSTS);
|
|
|
|
if (!(sdhsts & SDHSTS_CRC7_ERROR) ||
|
|
(host->cmd->opcode != MMC_SEND_OP_COND)) {
|
|
u32 edm, fsm;
|
|
|
|
if (sdhsts & SDHSTS_CMD_TIME_OUT) {
|
|
host->cmd->error = -ETIMEDOUT;
|
|
} else {
|
|
dev_err(dev, "unexpected command %d error\n",
|
|
host->cmd->opcode);
|
|
bcm2835_dumpregs(host);
|
|
host->cmd->error = -EILSEQ;
|
|
}
|
|
edm = readl(host->ioaddr + SDEDM);
|
|
fsm = edm & SDEDM_FSM_MASK;
|
|
if (fsm == SDEDM_FSM_READWAIT ||
|
|
fsm == SDEDM_FSM_WRITESTART1)
|
|
/* Kick the FSM out of its wait */
|
|
writel(edm | SDEDM_FORCE_DATA_MODE,
|
|
host->ioaddr + SDEDM);
|
|
bcm2835_finish_request(host);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (cmd->flags & MMC_RSP_PRESENT) {
|
|
if (cmd->flags & MMC_RSP_136) {
|
|
int i;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
cmd->resp[3 - i] =
|
|
readl(host->ioaddr + SDRSP0 + i * 4);
|
|
}
|
|
} else {
|
|
cmd->resp[0] = readl(host->ioaddr + SDRSP0);
|
|
}
|
|
}
|
|
|
|
if (cmd == host->mrq->sbc) {
|
|
/* Finished CMD23, now send actual command. */
|
|
host->cmd = NULL;
|
|
if (bcm2835_send_command(host, host->mrq->cmd)) {
|
|
if (host->data && host->dma_desc)
|
|
/* DMA transfer starts now, PIO starts
|
|
* after irq
|
|
*/
|
|
bcm2835_start_dma(host);
|
|
|
|
if (!host->use_busy)
|
|
bcm2835_finish_command(host);
|
|
}
|
|
} else if (cmd == host->mrq->stop) {
|
|
/* Finished CMD12 */
|
|
bcm2835_finish_request(host);
|
|
} else {
|
|
/* Processed actual command. */
|
|
host->cmd = NULL;
|
|
if (!host->data)
|
|
bcm2835_finish_request(host);
|
|
else if (host->data_complete)
|
|
bcm2835_transfer_complete(host);
|
|
}
|
|
}
|
|
|
|
static void bcm2835_timeout(struct work_struct *work)
|
|
{
|
|
struct delayed_work *d = to_delayed_work(work);
|
|
struct bcm2835_host *host =
|
|
container_of(d, struct bcm2835_host, timeout_work);
|
|
struct device *dev = &host->pdev->dev;
|
|
|
|
mutex_lock(&host->mutex);
|
|
|
|
if (host->mrq) {
|
|
dev_err(dev, "timeout waiting for hardware interrupt.\n");
|
|
bcm2835_dumpregs(host);
|
|
|
|
bcm2835_reset(mmc_from_priv(host));
|
|
|
|
if (host->data) {
|
|
host->data->error = -ETIMEDOUT;
|
|
bcm2835_finish_data(host);
|
|
} else {
|
|
if (host->cmd)
|
|
host->cmd->error = -ETIMEDOUT;
|
|
else
|
|
host->mrq->cmd->error = -ETIMEDOUT;
|
|
|
|
bcm2835_finish_request(host);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&host->mutex);
|
|
}
|
|
|
|
static bool bcm2835_check_cmd_error(struct bcm2835_host *host, u32 intmask)
|
|
{
|
|
struct device *dev = &host->pdev->dev;
|
|
|
|
if (!(intmask & SDHSTS_ERROR_MASK))
|
|
return false;
|
|
|
|
if (!host->cmd)
|
|
return true;
|
|
|
|
dev_err(dev, "sdhost_busy_irq: intmask %08x\n", intmask);
|
|
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;
|
|
}
|
|
bcm2835_dumpregs(host);
|
|
return true;
|
|
}
|
|
|
|
static void bcm2835_check_data_error(struct bcm2835_host *host, u32 intmask)
|
|
{
|
|
if (!host->data)
|
|
return;
|
|
if (intmask & (SDHSTS_CRC16_ERROR | SDHSTS_FIFO_ERROR))
|
|
host->data->error = -EILSEQ;
|
|
if (intmask & SDHSTS_REW_TIME_OUT)
|
|
host->data->error = -ETIMEDOUT;
|
|
}
|
|
|
|
static void bcm2835_busy_irq(struct bcm2835_host *host)
|
|
{
|
|
if (WARN_ON(!host->cmd)) {
|
|
bcm2835_dumpregs(host);
|
|
return;
|
|
}
|
|
|
|
if (WARN_ON(!host->use_busy)) {
|
|
bcm2835_dumpregs(host);
|
|
return;
|
|
}
|
|
host->use_busy = false;
|
|
|
|
bcm2835_finish_command(host);
|
|
}
|
|
|
|
static void bcm2835_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.
|
|
*/
|
|
if (!host->data)
|
|
return;
|
|
|
|
bcm2835_check_data_error(host, intmask);
|
|
if (host->data->error)
|
|
goto finished;
|
|
|
|
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;
|
|
writel(host->hcfg, host->ioaddr + SDHCFG);
|
|
bcm2835_transfer_pio(host);
|
|
} else {
|
|
bcm2835_transfer_pio(host);
|
|
host->blocks--;
|
|
if ((host->blocks == 0) || host->data->error)
|
|
goto finished;
|
|
}
|
|
return;
|
|
|
|
finished:
|
|
host->hcfg &= ~(SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN);
|
|
writel(host->hcfg, host->ioaddr + SDHCFG);
|
|
}
|
|
|
|
static void bcm2835_data_threaded_irq(struct bcm2835_host *host)
|
|
{
|
|
if (!host->data)
|
|
return;
|
|
if ((host->blocks == 0) || host->data->error)
|
|
bcm2835_finish_data(host);
|
|
}
|
|
|
|
static void bcm2835_block_irq(struct bcm2835_host *host)
|
|
{
|
|
if (WARN_ON(!host->data)) {
|
|
bcm2835_dumpregs(host);
|
|
return;
|
|
}
|
|
|
|
if (!host->dma_desc) {
|
|
WARN_ON(!host->blocks);
|
|
if (host->data->error || (--host->blocks == 0))
|
|
bcm2835_finish_data(host);
|
|
else
|
|
bcm2835_transfer_pio(host);
|
|
} else if (host->data->flags & MMC_DATA_WRITE) {
|
|
bcm2835_finish_data(host);
|
|
}
|
|
}
|
|
|
|
static irqreturn_t bcm2835_irq(int irq, void *dev_id)
|
|
{
|
|
irqreturn_t result = IRQ_NONE;
|
|
struct bcm2835_host *host = dev_id;
|
|
u32 intmask;
|
|
|
|
spin_lock(&host->lock);
|
|
|
|
intmask = readl(host->ioaddr + SDHSTS);
|
|
|
|
writel(SDHSTS_BUSY_IRPT |
|
|
SDHSTS_BLOCK_IRPT |
|
|
SDHSTS_SDIO_IRPT |
|
|
SDHSTS_DATA_FLAG,
|
|
host->ioaddr + SDHSTS);
|
|
|
|
if (intmask & SDHSTS_BLOCK_IRPT) {
|
|
bcm2835_check_data_error(host, intmask);
|
|
host->irq_block = true;
|
|
result = IRQ_WAKE_THREAD;
|
|
}
|
|
|
|
if (intmask & SDHSTS_BUSY_IRPT) {
|
|
if (!bcm2835_check_cmd_error(host, intmask)) {
|
|
host->irq_busy = true;
|
|
result = IRQ_WAKE_THREAD;
|
|
} else {
|
|
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_data_irq(host, intmask);
|
|
host->irq_data = true;
|
|
result = IRQ_WAKE_THREAD;
|
|
}
|
|
|
|
spin_unlock(&host->lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
static irqreturn_t bcm2835_threaded_irq(int irq, void *dev_id)
|
|
{
|
|
struct bcm2835_host *host = dev_id;
|
|
unsigned long flags;
|
|
bool block, busy, data;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
block = host->irq_block;
|
|
busy = host->irq_busy;
|
|
data = host->irq_data;
|
|
host->irq_block = false;
|
|
host->irq_busy = false;
|
|
host->irq_data = false;
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
mutex_lock(&host->mutex);
|
|
|
|
if (block)
|
|
bcm2835_block_irq(host);
|
|
if (busy)
|
|
bcm2835_busy_irq(host);
|
|
if (data)
|
|
bcm2835_data_threaded_irq(host);
|
|
|
|
mutex_unlock(&host->mutex);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void bcm2835_dma_complete_work(struct work_struct *work)
|
|
{
|
|
struct bcm2835_host *host =
|
|
container_of(work, struct bcm2835_host, dma_work);
|
|
struct mmc_data *data;
|
|
|
|
mutex_lock(&host->mutex);
|
|
|
|
data = host->data;
|
|
|
|
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) {
|
|
unsigned long flags;
|
|
void *page;
|
|
u32 *buf;
|
|
|
|
if (host->drain_offset & PAGE_MASK) {
|
|
host->drain_page += host->drain_offset >> PAGE_SHIFT;
|
|
host->drain_offset &= ~PAGE_MASK;
|
|
}
|
|
local_irq_save(flags);
|
|
page = kmap_atomic(host->drain_page);
|
|
buf = page + host->drain_offset;
|
|
|
|
while (host->drain_words) {
|
|
u32 edm = readl(host->ioaddr + SDEDM);
|
|
|
|
if ((edm >> 4) & 0x1f)
|
|
*(buf++) = readl(host->ioaddr + SDDATA);
|
|
host->drain_words--;
|
|
}
|
|
|
|
kunmap_atomic(page);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
bcm2835_finish_data(host);
|
|
|
|
mutex_unlock(&host->mutex);
|
|
}
|
|
|
|
static void bcm2835_set_clock(struct bcm2835_host *host, unsigned int clock)
|
|
{
|
|
struct mmc_host *mmc = mmc_from_priv(host);
|
|
int div;
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
if (clock < 100000) {
|
|
/* Can't stop the clock, but make it as slow as possible
|
|
* to show willing
|
|
*/
|
|
host->cdiv = SDCDIV_MAX_CDIV;
|
|
writel(host->cdiv, host->ioaddr + SDCDIV);
|
|
return;
|
|
}
|
|
|
|
div = host->max_clk / clock;
|
|
if (div < 2)
|
|
div = 2;
|
|
if ((host->max_clk / div) > clock)
|
|
div++;
|
|
div -= 2;
|
|
|
|
if (div > SDCDIV_MAX_CDIV)
|
|
div = SDCDIV_MAX_CDIV;
|
|
|
|
clock = host->max_clk / (div + 2);
|
|
mmc->actual_clock = clock;
|
|
|
|
/* Calibrate some delays */
|
|
|
|
host->ns_per_fifo_word = (1000000000 / clock) *
|
|
((mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32);
|
|
|
|
host->cdiv = div;
|
|
writel(host->cdiv, host->ioaddr + SDCDIV);
|
|
|
|
/* Set the timeout to 500ms */
|
|
writel(mmc->actual_clock / 2, host->ioaddr + SDTOUT);
|
|
}
|
|
|
|
static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
{
|
|
struct bcm2835_host *host = mmc_priv(mmc);
|
|
struct device *dev = &host->pdev->dev;
|
|
u32 edm, fsm;
|
|
|
|
/* 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)) {
|
|
dev_err(dev, "unsupported block size (%d bytes)\n",
|
|
mrq->data->blksz);
|
|
|
|
if (mrq->cmd)
|
|
mrq->cmd->error = -EINVAL;
|
|
|
|
mmc_request_done(mmc, mrq);
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&host->mutex);
|
|
|
|
WARN_ON(host->mrq);
|
|
host->mrq = mrq;
|
|
|
|
edm = readl(host->ioaddr + SDEDM);
|
|
fsm = edm & SDEDM_FSM_MASK;
|
|
|
|
if ((fsm != SDEDM_FSM_IDENTMODE) &&
|
|
(fsm != SDEDM_FSM_DATAMODE)) {
|
|
dev_err(dev, "previous command (%d) not complete (EDM %08x)\n",
|
|
readl(host->ioaddr + SDCMD) & SDCMD_CMD_MASK,
|
|
edm);
|
|
bcm2835_dumpregs(host);
|
|
|
|
if (mrq->cmd)
|
|
mrq->cmd->error = -EILSEQ;
|
|
|
|
bcm2835_finish_request(host);
|
|
mutex_unlock(&host->mutex);
|
|
return;
|
|
}
|
|
|
|
if (host->use_dma && mrq->data && (mrq->data->blocks > PIO_THRESHOLD))
|
|
bcm2835_prepare_dma(host, mrq->data);
|
|
|
|
host->use_sbc = !!mrq->sbc && host->mrq->data &&
|
|
(host->mrq->data->flags & MMC_DATA_READ);
|
|
if (host->use_sbc) {
|
|
if (bcm2835_send_command(host, mrq->sbc)) {
|
|
if (!host->use_busy)
|
|
bcm2835_finish_command(host);
|
|
}
|
|
} else if (mrq->cmd && bcm2835_send_command(host, mrq->cmd)) {
|
|
if (host->data && host->dma_desc) {
|
|
/* DMA transfer starts now, PIO starts after irq */
|
|
bcm2835_start_dma(host);
|
|
}
|
|
|
|
if (!host->use_busy)
|
|
bcm2835_finish_command(host);
|
|
}
|
|
|
|
mutex_unlock(&host->mutex);
|
|
}
|
|
|
|
static void bcm2835_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct bcm2835_host *host = mmc_priv(mmc);
|
|
|
|
mutex_lock(&host->mutex);
|
|
|
|
if (!ios->clock || ios->clock != host->clock) {
|
|
bcm2835_set_clock(host, ios->clock);
|
|
host->clock = ios->clock;
|
|
}
|
|
|
|
/* set bus width */
|
|
host->hcfg &= ~SDHCFG_WIDE_EXT_BUS;
|
|
if (ios->bus_width == MMC_BUS_WIDTH_4)
|
|
host->hcfg |= SDHCFG_WIDE_EXT_BUS;
|
|
|
|
host->hcfg |= SDHCFG_WIDE_INT_BUS;
|
|
|
|
/* Disable clever clock switching, to cope with fast core clocks */
|
|
host->hcfg |= SDHCFG_SLOW_CARD;
|
|
|
|
writel(host->hcfg, host->ioaddr + SDHCFG);
|
|
|
|
mutex_unlock(&host->mutex);
|
|
}
|
|
|
|
static const struct mmc_host_ops bcm2835_ops = {
|
|
.request = bcm2835_request,
|
|
.set_ios = bcm2835_set_ios,
|
|
.hw_reset = bcm2835_reset,
|
|
};
|
|
|
|
static int bcm2835_add_host(struct bcm2835_host *host)
|
|
{
|
|
struct mmc_host *mmc = mmc_from_priv(host);
|
|
struct device *dev = &host->pdev->dev;
|
|
char pio_limit_string[20];
|
|
int ret;
|
|
|
|
if (!mmc->f_max || mmc->f_max > host->max_clk)
|
|
mmc->f_max = host->max_clk;
|
|
mmc->f_min = host->max_clk / SDCDIV_MAX_CDIV;
|
|
|
|
mmc->max_busy_timeout = ~0 / (mmc->f_max / 1000);
|
|
|
|
dev_dbg(dev, "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 |
|
|
MMC_CAP_CMD23;
|
|
|
|
spin_lock_init(&host->lock);
|
|
mutex_init(&host->mutex);
|
|
|
|
if (!host->dma_chan_rxtx) {
|
|
dev_warn(dev, "unable to initialise DMA channel. Falling back to PIO\n");
|
|
host->use_dma = false;
|
|
} else {
|
|
host->use_dma = true;
|
|
|
|
host->dma_cfg_tx.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
host->dma_cfg_tx.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
host->dma_cfg_tx.slave_id = 13; /* DREQ channel */
|
|
host->dma_cfg_tx.direction = DMA_MEM_TO_DEV;
|
|
host->dma_cfg_tx.src_addr = 0;
|
|
host->dma_cfg_tx.dst_addr = host->phys_addr + SDDATA;
|
|
|
|
host->dma_cfg_rx.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
host->dma_cfg_rx.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
host->dma_cfg_rx.slave_id = 13; /* DREQ channel */
|
|
host->dma_cfg_rx.direction = DMA_DEV_TO_MEM;
|
|
host->dma_cfg_rx.src_addr = host->phys_addr + SDDATA;
|
|
host->dma_cfg_rx.dst_addr = 0;
|
|
|
|
if (dmaengine_slave_config(host->dma_chan_rxtx,
|
|
&host->dma_cfg_tx) != 0 ||
|
|
dmaengine_slave_config(host->dma_chan_rxtx,
|
|
&host->dma_cfg_rx) != 0)
|
|
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 = 1024;
|
|
mmc->max_blk_count = 65535;
|
|
|
|
/* report supported voltage ranges */
|
|
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
|
|
|
|
INIT_WORK(&host->dma_work, bcm2835_dma_complete_work);
|
|
INIT_DELAYED_WORK(&host->timeout_work, bcm2835_timeout);
|
|
|
|
/* Set interrupt enables */
|
|
host->hcfg = SDHCFG_BUSY_IRPT_EN;
|
|
|
|
bcm2835_reset_internal(host);
|
|
|
|
ret = request_threaded_irq(host->irq, bcm2835_irq,
|
|
bcm2835_threaded_irq,
|
|
0, mmc_hostname(mmc), host);
|
|
if (ret) {
|
|
dev_err(dev, "failed to request IRQ %d: %d\n", host->irq, ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = mmc_add_host(mmc);
|
|
if (ret) {
|
|
free_irq(host->irq, host);
|
|
return ret;
|
|
}
|
|
|
|
pio_limit_string[0] = '\0';
|
|
if (host->use_dma && (PIO_THRESHOLD > 0))
|
|
sprintf(pio_limit_string, " (>%d)", PIO_THRESHOLD);
|
|
dev_info(dev, "loaded - DMA %s%s\n",
|
|
host->use_dma ? "enabled" : "disabled", pio_limit_string);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm2835_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct clk *clk;
|
|
struct resource *iomem;
|
|
struct bcm2835_host *host;
|
|
struct mmc_host *mmc;
|
|
const __be32 *regaddr_p;
|
|
int ret;
|
|
|
|
dev_dbg(dev, "%s\n", __func__);
|
|
mmc = mmc_alloc_host(sizeof(*host), dev);
|
|
if (!mmc)
|
|
return -ENOMEM;
|
|
|
|
mmc->ops = &bcm2835_ops;
|
|
host = mmc_priv(mmc);
|
|
host->pdev = pdev;
|
|
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;
|
|
}
|
|
|
|
/* Parse OF address directly to get the physical address for
|
|
* DMA to our registers.
|
|
*/
|
|
regaddr_p = of_get_address(pdev->dev.of_node, 0, NULL, NULL);
|
|
if (!regaddr_p) {
|
|
dev_err(dev, "Can't get phys address\n");
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
host->phys_addr = be32_to_cpup(regaddr_p);
|
|
|
|
host->dma_chan = NULL;
|
|
host->dma_desc = NULL;
|
|
|
|
host->dma_chan_rxtx = dma_request_slave_channel(dev, "rx-tx");
|
|
|
|
clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(clk)) {
|
|
ret = PTR_ERR(clk);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(dev, "could not get clk: %d\n", ret);
|
|
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;
|
|
}
|
|
|
|
ret = mmc_of_parse(mmc);
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = bcm2835_add_host(host);
|
|
if (ret)
|
|
goto err;
|
|
|
|
platform_set_drvdata(pdev, host);
|
|
|
|
dev_dbg(dev, "%s -> OK\n", __func__);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
dev_dbg(dev, "%s -> err %d\n", __func__, ret);
|
|
if (host->dma_chan_rxtx)
|
|
dma_release_channel(host->dma_chan_rxtx);
|
|
mmc_free_host(mmc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bcm2835_remove(struct platform_device *pdev)
|
|
{
|
|
struct bcm2835_host *host = platform_get_drvdata(pdev);
|
|
struct mmc_host *mmc = mmc_from_priv(host);
|
|
|
|
mmc_remove_host(mmc);
|
|
|
|
writel(SDVDD_POWER_OFF, host->ioaddr + SDVDD);
|
|
|
|
free_irq(host->irq, host);
|
|
|
|
cancel_work_sync(&host->dma_work);
|
|
cancel_delayed_work_sync(&host->timeout_work);
|
|
|
|
if (host->dma_chan_rxtx)
|
|
dma_release_channel(host->dma_chan_rxtx);
|
|
|
|
mmc_free_host(mmc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id bcm2835_match[] = {
|
|
{ .compatible = "brcm,bcm2835-sdhost" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, bcm2835_match);
|
|
|
|
static struct platform_driver bcm2835_driver = {
|
|
.probe = bcm2835_probe,
|
|
.remove = bcm2835_remove,
|
|
.driver = {
|
|
.name = "sdhost-bcm2835",
|
|
.of_match_table = bcm2835_match,
|
|
},
|
|
};
|
|
module_platform_driver(bcm2835_driver);
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MODULE_ALIAS("platform:sdhost-bcm2835");
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MODULE_DESCRIPTION("BCM2835 SDHost driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Phil Elwell");
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