![Ulf Hansson](/assets/img/avatar_default.png)
The current value means an mdelay(1) may execute up to 10000000 times, which translates to around ~2.8 hours. This is probably not what the orignal author had in mind. Let's instead use 10s, which is the same value sh_mmcif is using for other timeouts. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
1609 lines
42 KiB
C
1609 lines
42 KiB
C
/*
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* MMCIF eMMC driver.
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*
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* Copyright (C) 2010 Renesas Solutions Corp.
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* Yusuke Goda <yusuke.goda.sx@renesas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*
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*
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* TODO
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* 1. DMA
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* 2. Power management
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* 3. Handle MMC errors better
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*
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*/
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/*
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* The MMCIF driver is now processing MMC requests asynchronously, according
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* to the Linux MMC API requirement.
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*
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* The MMCIF driver processes MMC requests in up to 3 stages: command, optional
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* data, and optional stop. To achieve asynchronous processing each of these
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* stages is split into two halves: a top and a bottom half. The top half
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* initialises the hardware, installs a timeout handler to handle completion
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* timeouts, and returns. In case of the command stage this immediately returns
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* control to the caller, leaving all further processing to run asynchronously.
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* All further request processing is performed by the bottom halves.
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*
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* The bottom half further consists of a "hard" IRQ handler, an IRQ handler
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* thread, a DMA completion callback, if DMA is used, a timeout work, and
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* request- and stage-specific handler methods.
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*
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* Each bottom half run begins with either a hardware interrupt, a DMA callback
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* invocation, or a timeout work run. In case of an error or a successful
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* processing completion, the MMC core is informed and the request processing is
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* finished. In case processing has to continue, i.e., if data has to be read
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* from or written to the card, or if a stop command has to be sent, the next
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* top half is called, which performs the necessary hardware handling and
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* reschedules the timeout work. This returns the driver state machine into the
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* bottom half waiting state.
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmaengine.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/core.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/sdio.h>
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#include <linux/mmc/sh_mmcif.h>
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#include <linux/mmc/slot-gpio.h>
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#include <linux/mod_devicetable.h>
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#include <linux/mutex.h>
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#include <linux/of_device.h>
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#include <linux/pagemap.h>
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#include <linux/platform_device.h>
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#include <linux/pm_qos.h>
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#include <linux/pm_runtime.h>
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#include <linux/sh_dma.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#define DRIVER_NAME "sh_mmcif"
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#define DRIVER_VERSION "2010-04-28"
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/* CE_CMD_SET */
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#define CMD_MASK 0x3f000000
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#define CMD_SET_RTYP_NO ((0 << 23) | (0 << 22))
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#define CMD_SET_RTYP_6B ((0 << 23) | (1 << 22)) /* R1/R1b/R3/R4/R5 */
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#define CMD_SET_RTYP_17B ((1 << 23) | (0 << 22)) /* R2 */
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#define CMD_SET_RBSY (1 << 21) /* R1b */
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#define CMD_SET_CCSEN (1 << 20)
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#define CMD_SET_WDAT (1 << 19) /* 1: on data, 0: no data */
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#define CMD_SET_DWEN (1 << 18) /* 1: write, 0: read */
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#define CMD_SET_CMLTE (1 << 17) /* 1: multi block trans, 0: single */
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#define CMD_SET_CMD12EN (1 << 16) /* 1: CMD12 auto issue */
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#define CMD_SET_RIDXC_INDEX ((0 << 15) | (0 << 14)) /* index check */
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#define CMD_SET_RIDXC_BITS ((0 << 15) | (1 << 14)) /* check bits check */
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#define CMD_SET_RIDXC_NO ((1 << 15) | (0 << 14)) /* no check */
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#define CMD_SET_CRC7C ((0 << 13) | (0 << 12)) /* CRC7 check*/
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#define CMD_SET_CRC7C_BITS ((0 << 13) | (1 << 12)) /* check bits check*/
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#define CMD_SET_CRC7C_INTERNAL ((1 << 13) | (0 << 12)) /* internal CRC7 check*/
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#define CMD_SET_CRC16C (1 << 10) /* 0: CRC16 check*/
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#define CMD_SET_CRCSTE (1 << 8) /* 1: not receive CRC status */
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#define CMD_SET_TBIT (1 << 7) /* 1: tran mission bit "Low" */
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#define CMD_SET_OPDM (1 << 6) /* 1: open/drain */
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#define CMD_SET_CCSH (1 << 5)
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#define CMD_SET_DARS (1 << 2) /* Dual Data Rate */
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#define CMD_SET_DATW_1 ((0 << 1) | (0 << 0)) /* 1bit */
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#define CMD_SET_DATW_4 ((0 << 1) | (1 << 0)) /* 4bit */
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#define CMD_SET_DATW_8 ((1 << 1) | (0 << 0)) /* 8bit */
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/* CE_CMD_CTRL */
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#define CMD_CTRL_BREAK (1 << 0)
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/* CE_BLOCK_SET */
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#define BLOCK_SIZE_MASK 0x0000ffff
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/* CE_INT */
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#define INT_CCSDE (1 << 29)
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#define INT_CMD12DRE (1 << 26)
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#define INT_CMD12RBE (1 << 25)
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#define INT_CMD12CRE (1 << 24)
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#define INT_DTRANE (1 << 23)
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#define INT_BUFRE (1 << 22)
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#define INT_BUFWEN (1 << 21)
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#define INT_BUFREN (1 << 20)
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#define INT_CCSRCV (1 << 19)
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#define INT_RBSYE (1 << 17)
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#define INT_CRSPE (1 << 16)
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#define INT_CMDVIO (1 << 15)
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#define INT_BUFVIO (1 << 14)
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#define INT_WDATERR (1 << 11)
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#define INT_RDATERR (1 << 10)
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#define INT_RIDXERR (1 << 9)
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#define INT_RSPERR (1 << 8)
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#define INT_CCSTO (1 << 5)
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#define INT_CRCSTO (1 << 4)
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#define INT_WDATTO (1 << 3)
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#define INT_RDATTO (1 << 2)
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#define INT_RBSYTO (1 << 1)
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#define INT_RSPTO (1 << 0)
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#define INT_ERR_STS (INT_CMDVIO | INT_BUFVIO | INT_WDATERR | \
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INT_RDATERR | INT_RIDXERR | INT_RSPERR | \
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INT_CCSTO | INT_CRCSTO | INT_WDATTO | \
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INT_RDATTO | INT_RBSYTO | INT_RSPTO)
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#define INT_ALL (INT_RBSYE | INT_CRSPE | INT_BUFREN | \
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INT_BUFWEN | INT_CMD12DRE | INT_BUFRE | \
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INT_DTRANE | INT_CMD12RBE | INT_CMD12CRE)
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#define INT_CCS (INT_CCSTO | INT_CCSRCV | INT_CCSDE)
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/* CE_INT_MASK */
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#define MASK_ALL 0x00000000
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#define MASK_MCCSDE (1 << 29)
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#define MASK_MCMD12DRE (1 << 26)
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#define MASK_MCMD12RBE (1 << 25)
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#define MASK_MCMD12CRE (1 << 24)
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#define MASK_MDTRANE (1 << 23)
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#define MASK_MBUFRE (1 << 22)
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#define MASK_MBUFWEN (1 << 21)
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#define MASK_MBUFREN (1 << 20)
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#define MASK_MCCSRCV (1 << 19)
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#define MASK_MRBSYE (1 << 17)
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#define MASK_MCRSPE (1 << 16)
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#define MASK_MCMDVIO (1 << 15)
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#define MASK_MBUFVIO (1 << 14)
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#define MASK_MWDATERR (1 << 11)
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#define MASK_MRDATERR (1 << 10)
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#define MASK_MRIDXERR (1 << 9)
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#define MASK_MRSPERR (1 << 8)
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#define MASK_MCCSTO (1 << 5)
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#define MASK_MCRCSTO (1 << 4)
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#define MASK_MWDATTO (1 << 3)
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#define MASK_MRDATTO (1 << 2)
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#define MASK_MRBSYTO (1 << 1)
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#define MASK_MRSPTO (1 << 0)
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#define MASK_START_CMD (MASK_MCMDVIO | MASK_MBUFVIO | MASK_MWDATERR | \
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MASK_MRDATERR | MASK_MRIDXERR | MASK_MRSPERR | \
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MASK_MCRCSTO | MASK_MWDATTO | \
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MASK_MRDATTO | MASK_MRBSYTO | MASK_MRSPTO)
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#define MASK_CLEAN (INT_ERR_STS | MASK_MRBSYE | MASK_MCRSPE | \
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MASK_MBUFREN | MASK_MBUFWEN | \
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MASK_MCMD12DRE | MASK_MBUFRE | MASK_MDTRANE | \
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MASK_MCMD12RBE | MASK_MCMD12CRE)
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/* CE_HOST_STS1 */
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#define STS1_CMDSEQ (1 << 31)
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/* CE_HOST_STS2 */
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#define STS2_CRCSTE (1 << 31)
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#define STS2_CRC16E (1 << 30)
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#define STS2_AC12CRCE (1 << 29)
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#define STS2_RSPCRC7E (1 << 28)
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#define STS2_CRCSTEBE (1 << 27)
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#define STS2_RDATEBE (1 << 26)
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#define STS2_AC12REBE (1 << 25)
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#define STS2_RSPEBE (1 << 24)
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#define STS2_AC12IDXE (1 << 23)
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#define STS2_RSPIDXE (1 << 22)
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#define STS2_CCSTO (1 << 15)
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#define STS2_RDATTO (1 << 14)
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#define STS2_DATBSYTO (1 << 13)
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#define STS2_CRCSTTO (1 << 12)
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#define STS2_AC12BSYTO (1 << 11)
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#define STS2_RSPBSYTO (1 << 10)
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#define STS2_AC12RSPTO (1 << 9)
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#define STS2_RSPTO (1 << 8)
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#define STS2_CRC_ERR (STS2_CRCSTE | STS2_CRC16E | \
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STS2_AC12CRCE | STS2_RSPCRC7E | STS2_CRCSTEBE)
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#define STS2_TIMEOUT_ERR (STS2_CCSTO | STS2_RDATTO | \
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STS2_DATBSYTO | STS2_CRCSTTO | \
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STS2_AC12BSYTO | STS2_RSPBSYTO | \
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STS2_AC12RSPTO | STS2_RSPTO)
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#define CLKDEV_EMMC_DATA 52000000 /* 52MHz */
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#define CLKDEV_MMC_DATA 20000000 /* 20MHz */
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#define CLKDEV_INIT 400000 /* 400 KHz */
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enum sh_mmcif_state {
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STATE_IDLE,
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STATE_REQUEST,
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STATE_IOS,
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STATE_TIMEOUT,
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};
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enum sh_mmcif_wait_for {
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MMCIF_WAIT_FOR_REQUEST,
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MMCIF_WAIT_FOR_CMD,
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MMCIF_WAIT_FOR_MREAD,
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MMCIF_WAIT_FOR_MWRITE,
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MMCIF_WAIT_FOR_READ,
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MMCIF_WAIT_FOR_WRITE,
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MMCIF_WAIT_FOR_READ_END,
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MMCIF_WAIT_FOR_WRITE_END,
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MMCIF_WAIT_FOR_STOP,
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};
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/*
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* difference for each SoC
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*/
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struct sh_mmcif_host {
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struct mmc_host *mmc;
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struct mmc_request *mrq;
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struct platform_device *pd;
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struct clk *clk;
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int bus_width;
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unsigned char timing;
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bool sd_error;
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bool dying;
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long timeout;
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void __iomem *addr;
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u32 *pio_ptr;
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spinlock_t lock; /* protect sh_mmcif_host::state */
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enum sh_mmcif_state state;
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enum sh_mmcif_wait_for wait_for;
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struct delayed_work timeout_work;
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size_t blocksize;
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int sg_idx;
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int sg_blkidx;
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bool power;
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bool ccs_enable; /* Command Completion Signal support */
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bool clk_ctrl2_enable;
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struct mutex thread_lock;
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u32 clkdiv_map; /* see CE_CLK_CTRL::CLKDIV */
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/* DMA support */
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struct dma_chan *chan_rx;
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struct dma_chan *chan_tx;
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struct completion dma_complete;
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bool dma_active;
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};
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static const struct of_device_id sh_mmcif_of_match[] = {
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{ .compatible = "renesas,sh-mmcif" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, sh_mmcif_of_match);
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#define sh_mmcif_host_to_dev(host) (&host->pd->dev)
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static inline void sh_mmcif_bitset(struct sh_mmcif_host *host,
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unsigned int reg, u32 val)
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{
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writel(val | readl(host->addr + reg), host->addr + reg);
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}
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static inline void sh_mmcif_bitclr(struct sh_mmcif_host *host,
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unsigned int reg, u32 val)
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{
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writel(~val & readl(host->addr + reg), host->addr + reg);
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}
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static void sh_mmcif_dma_complete(void *arg)
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{
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struct sh_mmcif_host *host = arg;
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struct mmc_request *mrq = host->mrq;
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struct device *dev = sh_mmcif_host_to_dev(host);
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dev_dbg(dev, "Command completed\n");
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if (WARN(!mrq || !mrq->data, "%s: NULL data in DMA completion!\n",
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dev_name(dev)))
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return;
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complete(&host->dma_complete);
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}
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static void sh_mmcif_start_dma_rx(struct sh_mmcif_host *host)
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{
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struct mmc_data *data = host->mrq->data;
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struct scatterlist *sg = data->sg;
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struct dma_async_tx_descriptor *desc = NULL;
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struct dma_chan *chan = host->chan_rx;
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struct device *dev = sh_mmcif_host_to_dev(host);
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dma_cookie_t cookie = -EINVAL;
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int ret;
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ret = dma_map_sg(chan->device->dev, sg, data->sg_len,
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DMA_FROM_DEVICE);
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if (ret > 0) {
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host->dma_active = true;
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desc = dmaengine_prep_slave_sg(chan, sg, ret,
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DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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}
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if (desc) {
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desc->callback = sh_mmcif_dma_complete;
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desc->callback_param = host;
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cookie = dmaengine_submit(desc);
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sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN);
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dma_async_issue_pending(chan);
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}
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dev_dbg(dev, "%s(): mapped %d -> %d, cookie %d\n",
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__func__, data->sg_len, ret, cookie);
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if (!desc) {
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/* DMA failed, fall back to PIO */
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if (ret >= 0)
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ret = -EIO;
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host->chan_rx = NULL;
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host->dma_active = false;
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dma_release_channel(chan);
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/* Free the Tx channel too */
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chan = host->chan_tx;
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if (chan) {
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host->chan_tx = NULL;
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dma_release_channel(chan);
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}
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dev_warn(dev,
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"DMA failed: %d, falling back to PIO\n", ret);
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sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
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}
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dev_dbg(dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__,
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desc, cookie, data->sg_len);
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}
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static void sh_mmcif_start_dma_tx(struct sh_mmcif_host *host)
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{
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struct mmc_data *data = host->mrq->data;
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struct scatterlist *sg = data->sg;
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struct dma_async_tx_descriptor *desc = NULL;
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struct dma_chan *chan = host->chan_tx;
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struct device *dev = sh_mmcif_host_to_dev(host);
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dma_cookie_t cookie = -EINVAL;
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int ret;
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ret = dma_map_sg(chan->device->dev, sg, data->sg_len,
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DMA_TO_DEVICE);
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if (ret > 0) {
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host->dma_active = true;
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desc = dmaengine_prep_slave_sg(chan, sg, ret,
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DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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}
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if (desc) {
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desc->callback = sh_mmcif_dma_complete;
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desc->callback_param = host;
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cookie = dmaengine_submit(desc);
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sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAWEN);
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dma_async_issue_pending(chan);
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}
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dev_dbg(dev, "%s(): mapped %d -> %d, cookie %d\n",
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__func__, data->sg_len, ret, cookie);
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if (!desc) {
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/* DMA failed, fall back to PIO */
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if (ret >= 0)
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ret = -EIO;
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host->chan_tx = NULL;
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host->dma_active = false;
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dma_release_channel(chan);
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/* Free the Rx channel too */
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chan = host->chan_rx;
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if (chan) {
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host->chan_rx = NULL;
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dma_release_channel(chan);
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}
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dev_warn(dev,
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"DMA failed: %d, falling back to PIO\n", ret);
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sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
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}
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dev_dbg(dev, "%s(): desc %p, cookie %d\n", __func__,
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desc, cookie);
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}
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static struct dma_chan *
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sh_mmcif_request_dma_pdata(struct sh_mmcif_host *host, uintptr_t slave_id)
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{
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dma_cap_mask_t mask;
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dma_cap_zero(mask);
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dma_cap_set(DMA_SLAVE, mask);
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if (slave_id <= 0)
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return NULL;
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return dma_request_channel(mask, shdma_chan_filter, (void *)slave_id);
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}
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static int sh_mmcif_dma_slave_config(struct sh_mmcif_host *host,
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struct dma_chan *chan,
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enum dma_transfer_direction direction)
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{
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struct resource *res;
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struct dma_slave_config cfg = { 0, };
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res = platform_get_resource(host->pd, IORESOURCE_MEM, 0);
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cfg.direction = direction;
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if (direction == DMA_DEV_TO_MEM) {
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cfg.src_addr = res->start + MMCIF_CE_DATA;
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cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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} else {
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cfg.dst_addr = res->start + MMCIF_CE_DATA;
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cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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}
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return dmaengine_slave_config(chan, &cfg);
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}
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|
|
static void sh_mmcif_request_dma(struct sh_mmcif_host *host)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
host->dma_active = false;
|
|
|
|
/* We can only either use DMA for both Tx and Rx or not use it at all */
|
|
if (IS_ENABLED(CONFIG_SUPERH) && dev->platform_data) {
|
|
struct sh_mmcif_plat_data *pdata = dev->platform_data;
|
|
|
|
host->chan_tx = sh_mmcif_request_dma_pdata(host,
|
|
pdata->slave_id_tx);
|
|
host->chan_rx = sh_mmcif_request_dma_pdata(host,
|
|
pdata->slave_id_rx);
|
|
} else {
|
|
host->chan_tx = dma_request_slave_channel(dev, "tx");
|
|
host->chan_rx = dma_request_slave_channel(dev, "rx");
|
|
}
|
|
dev_dbg(dev, "%s: got channel TX %p RX %p\n", __func__, host->chan_tx,
|
|
host->chan_rx);
|
|
|
|
if (!host->chan_tx || !host->chan_rx ||
|
|
sh_mmcif_dma_slave_config(host, host->chan_tx, DMA_MEM_TO_DEV) ||
|
|
sh_mmcif_dma_slave_config(host, host->chan_rx, DMA_DEV_TO_MEM))
|
|
goto error;
|
|
|
|
return;
|
|
|
|
error:
|
|
if (host->chan_tx)
|
|
dma_release_channel(host->chan_tx);
|
|
if (host->chan_rx)
|
|
dma_release_channel(host->chan_rx);
|
|
host->chan_tx = host->chan_rx = NULL;
|
|
}
|
|
|
|
static void sh_mmcif_release_dma(struct sh_mmcif_host *host)
|
|
{
|
|
sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
|
|
/* Descriptors are freed automatically */
|
|
if (host->chan_tx) {
|
|
struct dma_chan *chan = host->chan_tx;
|
|
host->chan_tx = NULL;
|
|
dma_release_channel(chan);
|
|
}
|
|
if (host->chan_rx) {
|
|
struct dma_chan *chan = host->chan_rx;
|
|
host->chan_rx = NULL;
|
|
dma_release_channel(chan);
|
|
}
|
|
|
|
host->dma_active = false;
|
|
}
|
|
|
|
static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
struct sh_mmcif_plat_data *p = dev->platform_data;
|
|
bool sup_pclk = p ? p->sup_pclk : false;
|
|
unsigned int current_clk = clk_get_rate(host->clk);
|
|
unsigned int clkdiv;
|
|
|
|
sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
|
|
sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR);
|
|
|
|
if (!clk)
|
|
return;
|
|
|
|
if (host->clkdiv_map) {
|
|
unsigned int freq, best_freq, myclk, div, diff_min, diff;
|
|
int i;
|
|
|
|
clkdiv = 0;
|
|
diff_min = ~0;
|
|
best_freq = 0;
|
|
for (i = 31; i >= 0; i--) {
|
|
if (!((1 << i) & host->clkdiv_map))
|
|
continue;
|
|
|
|
/*
|
|
* clk = parent_freq / div
|
|
* -> parent_freq = clk x div
|
|
*/
|
|
|
|
div = 1 << (i + 1);
|
|
freq = clk_round_rate(host->clk, clk * div);
|
|
myclk = freq / div;
|
|
diff = (myclk > clk) ? myclk - clk : clk - myclk;
|
|
|
|
if (diff <= diff_min) {
|
|
best_freq = freq;
|
|
clkdiv = i;
|
|
diff_min = diff;
|
|
}
|
|
}
|
|
|
|
dev_dbg(dev, "clk %u/%u (%u, 0x%x)\n",
|
|
(best_freq / (1 << (clkdiv + 1))), clk,
|
|
best_freq, clkdiv);
|
|
|
|
clk_set_rate(host->clk, best_freq);
|
|
clkdiv = clkdiv << 16;
|
|
} else if (sup_pclk && clk == current_clk) {
|
|
clkdiv = CLK_SUP_PCLK;
|
|
} else {
|
|
clkdiv = (fls(DIV_ROUND_UP(current_clk, clk) - 1) - 1) << 16;
|
|
}
|
|
|
|
sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR & clkdiv);
|
|
sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
|
|
}
|
|
|
|
static void sh_mmcif_sync_reset(struct sh_mmcif_host *host)
|
|
{
|
|
u32 tmp;
|
|
|
|
tmp = 0x010f0000 & sh_mmcif_readl(host->addr, MMCIF_CE_CLK_CTRL);
|
|
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_ON);
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_OFF);
|
|
if (host->ccs_enable)
|
|
tmp |= SCCSTO_29;
|
|
if (host->clk_ctrl2_enable)
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_CLK_CTRL2, 0x0F0F0000);
|
|
sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, tmp |
|
|
SRSPTO_256 | SRBSYTO_29 | SRWDTO_29);
|
|
/* byte swap on */
|
|
sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_ATYP);
|
|
}
|
|
|
|
static int sh_mmcif_error_manage(struct sh_mmcif_host *host)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
u32 state1, state2;
|
|
int ret, timeout;
|
|
|
|
host->sd_error = false;
|
|
|
|
state1 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1);
|
|
state2 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS2);
|
|
dev_dbg(dev, "ERR HOST_STS1 = %08x\n", state1);
|
|
dev_dbg(dev, "ERR HOST_STS2 = %08x\n", state2);
|
|
|
|
if (state1 & STS1_CMDSEQ) {
|
|
sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, CMD_CTRL_BREAK);
|
|
sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, ~CMD_CTRL_BREAK);
|
|
for (timeout = 10000; timeout; timeout--) {
|
|
if (!(sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1)
|
|
& STS1_CMDSEQ))
|
|
break;
|
|
mdelay(1);
|
|
}
|
|
if (!timeout) {
|
|
dev_err(dev,
|
|
"Forced end of command sequence timeout err\n");
|
|
return -EIO;
|
|
}
|
|
sh_mmcif_sync_reset(host);
|
|
dev_dbg(dev, "Forced end of command sequence\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (state2 & STS2_CRC_ERR) {
|
|
dev_err(dev, " CRC error: state %u, wait %u\n",
|
|
host->state, host->wait_for);
|
|
ret = -EIO;
|
|
} else if (state2 & STS2_TIMEOUT_ERR) {
|
|
dev_err(dev, " Timeout: state %u, wait %u\n",
|
|
host->state, host->wait_for);
|
|
ret = -ETIMEDOUT;
|
|
} else {
|
|
dev_dbg(dev, " End/Index error: state %u, wait %u\n",
|
|
host->state, host->wait_for);
|
|
ret = -EIO;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static bool sh_mmcif_next_block(struct sh_mmcif_host *host, u32 *p)
|
|
{
|
|
struct mmc_data *data = host->mrq->data;
|
|
|
|
host->sg_blkidx += host->blocksize;
|
|
|
|
/* data->sg->length must be a multiple of host->blocksize? */
|
|
BUG_ON(host->sg_blkidx > data->sg->length);
|
|
|
|
if (host->sg_blkidx == data->sg->length) {
|
|
host->sg_blkidx = 0;
|
|
if (++host->sg_idx < data->sg_len)
|
|
host->pio_ptr = sg_virt(++data->sg);
|
|
} else {
|
|
host->pio_ptr = p;
|
|
}
|
|
|
|
return host->sg_idx != data->sg_len;
|
|
}
|
|
|
|
static void sh_mmcif_single_read(struct sh_mmcif_host *host,
|
|
struct mmc_request *mrq)
|
|
{
|
|
host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
|
|
BLOCK_SIZE_MASK) + 3;
|
|
|
|
host->wait_for = MMCIF_WAIT_FOR_READ;
|
|
|
|
/* buf read enable */
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
|
|
}
|
|
|
|
static bool sh_mmcif_read_block(struct sh_mmcif_host *host)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
struct mmc_data *data = host->mrq->data;
|
|
u32 *p = sg_virt(data->sg);
|
|
int i;
|
|
|
|
if (host->sd_error) {
|
|
data->error = sh_mmcif_error_manage(host);
|
|
dev_dbg(dev, "%s(): %d\n", __func__, data->error);
|
|
return false;
|
|
}
|
|
|
|
for (i = 0; i < host->blocksize / 4; i++)
|
|
*p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
|
|
|
|
/* buffer read end */
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
|
|
host->wait_for = MMCIF_WAIT_FOR_READ_END;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void sh_mmcif_multi_read(struct sh_mmcif_host *host,
|
|
struct mmc_request *mrq)
|
|
{
|
|
struct mmc_data *data = mrq->data;
|
|
|
|
if (!data->sg_len || !data->sg->length)
|
|
return;
|
|
|
|
host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
|
|
BLOCK_SIZE_MASK;
|
|
|
|
host->wait_for = MMCIF_WAIT_FOR_MREAD;
|
|
host->sg_idx = 0;
|
|
host->sg_blkidx = 0;
|
|
host->pio_ptr = sg_virt(data->sg);
|
|
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
|
|
}
|
|
|
|
static bool sh_mmcif_mread_block(struct sh_mmcif_host *host)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
struct mmc_data *data = host->mrq->data;
|
|
u32 *p = host->pio_ptr;
|
|
int i;
|
|
|
|
if (host->sd_error) {
|
|
data->error = sh_mmcif_error_manage(host);
|
|
dev_dbg(dev, "%s(): %d\n", __func__, data->error);
|
|
return false;
|
|
}
|
|
|
|
BUG_ON(!data->sg->length);
|
|
|
|
for (i = 0; i < host->blocksize / 4; i++)
|
|
*p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
|
|
|
|
if (!sh_mmcif_next_block(host, p))
|
|
return false;
|
|
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
|
|
|
|
return true;
|
|
}
|
|
|
|
static void sh_mmcif_single_write(struct sh_mmcif_host *host,
|
|
struct mmc_request *mrq)
|
|
{
|
|
host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
|
|
BLOCK_SIZE_MASK) + 3;
|
|
|
|
host->wait_for = MMCIF_WAIT_FOR_WRITE;
|
|
|
|
/* buf write enable */
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
|
|
}
|
|
|
|
static bool sh_mmcif_write_block(struct sh_mmcif_host *host)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
struct mmc_data *data = host->mrq->data;
|
|
u32 *p = sg_virt(data->sg);
|
|
int i;
|
|
|
|
if (host->sd_error) {
|
|
data->error = sh_mmcif_error_manage(host);
|
|
dev_dbg(dev, "%s(): %d\n", __func__, data->error);
|
|
return false;
|
|
}
|
|
|
|
for (i = 0; i < host->blocksize / 4; i++)
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
|
|
|
|
/* buffer write end */
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
|
|
host->wait_for = MMCIF_WAIT_FOR_WRITE_END;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void sh_mmcif_multi_write(struct sh_mmcif_host *host,
|
|
struct mmc_request *mrq)
|
|
{
|
|
struct mmc_data *data = mrq->data;
|
|
|
|
if (!data->sg_len || !data->sg->length)
|
|
return;
|
|
|
|
host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
|
|
BLOCK_SIZE_MASK;
|
|
|
|
host->wait_for = MMCIF_WAIT_FOR_MWRITE;
|
|
host->sg_idx = 0;
|
|
host->sg_blkidx = 0;
|
|
host->pio_ptr = sg_virt(data->sg);
|
|
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
|
|
}
|
|
|
|
static bool sh_mmcif_mwrite_block(struct sh_mmcif_host *host)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
struct mmc_data *data = host->mrq->data;
|
|
u32 *p = host->pio_ptr;
|
|
int i;
|
|
|
|
if (host->sd_error) {
|
|
data->error = sh_mmcif_error_manage(host);
|
|
dev_dbg(dev, "%s(): %d\n", __func__, data->error);
|
|
return false;
|
|
}
|
|
|
|
BUG_ON(!data->sg->length);
|
|
|
|
for (i = 0; i < host->blocksize / 4; i++)
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
|
|
|
|
if (!sh_mmcif_next_block(host, p))
|
|
return false;
|
|
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
|
|
|
|
return true;
|
|
}
|
|
|
|
static void sh_mmcif_get_response(struct sh_mmcif_host *host,
|
|
struct mmc_command *cmd)
|
|
{
|
|
if (cmd->flags & MMC_RSP_136) {
|
|
cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP3);
|
|
cmd->resp[1] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP2);
|
|
cmd->resp[2] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP1);
|
|
cmd->resp[3] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
|
|
} else
|
|
cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
|
|
}
|
|
|
|
static void sh_mmcif_get_cmd12response(struct sh_mmcif_host *host,
|
|
struct mmc_command *cmd)
|
|
{
|
|
cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP_CMD12);
|
|
}
|
|
|
|
static u32 sh_mmcif_set_cmd(struct sh_mmcif_host *host,
|
|
struct mmc_request *mrq)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
struct mmc_data *data = mrq->data;
|
|
struct mmc_command *cmd = mrq->cmd;
|
|
u32 opc = cmd->opcode;
|
|
u32 tmp = 0;
|
|
|
|
/* Response Type check */
|
|
switch (mmc_resp_type(cmd)) {
|
|
case MMC_RSP_NONE:
|
|
tmp |= CMD_SET_RTYP_NO;
|
|
break;
|
|
case MMC_RSP_R1:
|
|
case MMC_RSP_R3:
|
|
tmp |= CMD_SET_RTYP_6B;
|
|
break;
|
|
case MMC_RSP_R1B:
|
|
tmp |= CMD_SET_RBSY | CMD_SET_RTYP_6B;
|
|
break;
|
|
case MMC_RSP_R2:
|
|
tmp |= CMD_SET_RTYP_17B;
|
|
break;
|
|
default:
|
|
dev_err(dev, "Unsupported response type.\n");
|
|
break;
|
|
}
|
|
|
|
/* WDAT / DATW */
|
|
if (data) {
|
|
tmp |= CMD_SET_WDAT;
|
|
switch (host->bus_width) {
|
|
case MMC_BUS_WIDTH_1:
|
|
tmp |= CMD_SET_DATW_1;
|
|
break;
|
|
case MMC_BUS_WIDTH_4:
|
|
tmp |= CMD_SET_DATW_4;
|
|
break;
|
|
case MMC_BUS_WIDTH_8:
|
|
tmp |= CMD_SET_DATW_8;
|
|
break;
|
|
default:
|
|
dev_err(dev, "Unsupported bus width.\n");
|
|
break;
|
|
}
|
|
switch (host->timing) {
|
|
case MMC_TIMING_MMC_DDR52:
|
|
/*
|
|
* MMC core will only set this timing, if the host
|
|
* advertises the MMC_CAP_1_8V_DDR/MMC_CAP_1_2V_DDR
|
|
* capability. MMCIF implementations with this
|
|
* capability, e.g. sh73a0, will have to set it
|
|
* in their platform data.
|
|
*/
|
|
tmp |= CMD_SET_DARS;
|
|
break;
|
|
}
|
|
}
|
|
/* DWEN */
|
|
if (opc == MMC_WRITE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK)
|
|
tmp |= CMD_SET_DWEN;
|
|
/* CMLTE/CMD12EN */
|
|
if (opc == MMC_READ_MULTIPLE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK) {
|
|
tmp |= CMD_SET_CMLTE | CMD_SET_CMD12EN;
|
|
sh_mmcif_bitset(host, MMCIF_CE_BLOCK_SET,
|
|
data->blocks << 16);
|
|
}
|
|
/* RIDXC[1:0] check bits */
|
|
if (opc == MMC_SEND_OP_COND || opc == MMC_ALL_SEND_CID ||
|
|
opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
|
|
tmp |= CMD_SET_RIDXC_BITS;
|
|
/* RCRC7C[1:0] check bits */
|
|
if (opc == MMC_SEND_OP_COND)
|
|
tmp |= CMD_SET_CRC7C_BITS;
|
|
/* RCRC7C[1:0] internal CRC7 */
|
|
if (opc == MMC_ALL_SEND_CID ||
|
|
opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
|
|
tmp |= CMD_SET_CRC7C_INTERNAL;
|
|
|
|
return (opc << 24) | tmp;
|
|
}
|
|
|
|
static int sh_mmcif_data_trans(struct sh_mmcif_host *host,
|
|
struct mmc_request *mrq, u32 opc)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
|
|
switch (opc) {
|
|
case MMC_READ_MULTIPLE_BLOCK:
|
|
sh_mmcif_multi_read(host, mrq);
|
|
return 0;
|
|
case MMC_WRITE_MULTIPLE_BLOCK:
|
|
sh_mmcif_multi_write(host, mrq);
|
|
return 0;
|
|
case MMC_WRITE_BLOCK:
|
|
sh_mmcif_single_write(host, mrq);
|
|
return 0;
|
|
case MMC_READ_SINGLE_BLOCK:
|
|
case MMC_SEND_EXT_CSD:
|
|
sh_mmcif_single_read(host, mrq);
|
|
return 0;
|
|
default:
|
|
dev_err(dev, "Unsupported CMD%d\n", opc);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static void sh_mmcif_start_cmd(struct sh_mmcif_host *host,
|
|
struct mmc_request *mrq)
|
|
{
|
|
struct mmc_command *cmd = mrq->cmd;
|
|
u32 opc = cmd->opcode;
|
|
u32 mask = 0;
|
|
unsigned long flags;
|
|
|
|
if (cmd->flags & MMC_RSP_BUSY)
|
|
mask = MASK_START_CMD | MASK_MRBSYE;
|
|
else
|
|
mask = MASK_START_CMD | MASK_MCRSPE;
|
|
|
|
if (host->ccs_enable)
|
|
mask |= MASK_MCCSTO;
|
|
|
|
if (mrq->data) {
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET, 0);
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET,
|
|
mrq->data->blksz);
|
|
}
|
|
opc = sh_mmcif_set_cmd(host, mrq);
|
|
|
|
if (host->ccs_enable)
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_INT, 0xD80430C0);
|
|
else
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_INT, 0xD80430C0 | INT_CCS);
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, mask);
|
|
/* set arg */
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_ARG, cmd->arg);
|
|
/* set cmd */
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_CMD_SET, opc);
|
|
|
|
host->wait_for = MMCIF_WAIT_FOR_CMD;
|
|
schedule_delayed_work(&host->timeout_work, host->timeout);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
static void sh_mmcif_stop_cmd(struct sh_mmcif_host *host,
|
|
struct mmc_request *mrq)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
|
|
switch (mrq->cmd->opcode) {
|
|
case MMC_READ_MULTIPLE_BLOCK:
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE);
|
|
break;
|
|
case MMC_WRITE_MULTIPLE_BLOCK:
|
|
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE);
|
|
break;
|
|
default:
|
|
dev_err(dev, "unsupported stop cmd\n");
|
|
mrq->stop->error = sh_mmcif_error_manage(host);
|
|
return;
|
|
}
|
|
|
|
host->wait_for = MMCIF_WAIT_FOR_STOP;
|
|
}
|
|
|
|
static void sh_mmcif_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
{
|
|
struct sh_mmcif_host *host = mmc_priv(mmc);
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
if (host->state != STATE_IDLE) {
|
|
dev_dbg(dev, "%s() rejected, state %u\n",
|
|
__func__, host->state);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
mrq->cmd->error = -EAGAIN;
|
|
mmc_request_done(mmc, mrq);
|
|
return;
|
|
}
|
|
|
|
host->state = STATE_REQUEST;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
host->mrq = mrq;
|
|
|
|
sh_mmcif_start_cmd(host, mrq);
|
|
}
|
|
|
|
static void sh_mmcif_clk_setup(struct sh_mmcif_host *host)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
|
|
if (host->mmc->f_max) {
|
|
unsigned int f_max, f_min = 0, f_min_old;
|
|
|
|
f_max = host->mmc->f_max;
|
|
for (f_min_old = f_max; f_min_old > 2;) {
|
|
f_min = clk_round_rate(host->clk, f_min_old / 2);
|
|
if (f_min == f_min_old)
|
|
break;
|
|
f_min_old = f_min;
|
|
}
|
|
|
|
/*
|
|
* This driver assumes this SoC is R-Car Gen2 or later
|
|
*/
|
|
host->clkdiv_map = 0x3ff;
|
|
|
|
host->mmc->f_max = f_max / (1 << ffs(host->clkdiv_map));
|
|
host->mmc->f_min = f_min / (1 << fls(host->clkdiv_map));
|
|
} else {
|
|
unsigned int clk = clk_get_rate(host->clk);
|
|
|
|
host->mmc->f_max = clk / 2;
|
|
host->mmc->f_min = clk / 512;
|
|
}
|
|
|
|
dev_dbg(dev, "clk max/min = %d/%d\n",
|
|
host->mmc->f_max, host->mmc->f_min);
|
|
}
|
|
|
|
static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct sh_mmcif_host *host = mmc_priv(mmc);
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
if (host->state != STATE_IDLE) {
|
|
dev_dbg(dev, "%s() rejected, state %u\n",
|
|
__func__, host->state);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
return;
|
|
}
|
|
|
|
host->state = STATE_IOS;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
switch (ios->power_mode) {
|
|
case MMC_POWER_UP:
|
|
if (!IS_ERR(mmc->supply.vmmc))
|
|
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
|
|
if (!host->power) {
|
|
clk_prepare_enable(host->clk);
|
|
pm_runtime_get_sync(dev);
|
|
sh_mmcif_sync_reset(host);
|
|
sh_mmcif_request_dma(host);
|
|
host->power = true;
|
|
}
|
|
break;
|
|
case MMC_POWER_OFF:
|
|
if (!IS_ERR(mmc->supply.vmmc))
|
|
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
|
|
if (host->power) {
|
|
sh_mmcif_clock_control(host, 0);
|
|
sh_mmcif_release_dma(host);
|
|
pm_runtime_put(dev);
|
|
clk_disable_unprepare(host->clk);
|
|
host->power = false;
|
|
}
|
|
break;
|
|
case MMC_POWER_ON:
|
|
sh_mmcif_clock_control(host, ios->clock);
|
|
break;
|
|
}
|
|
|
|
host->timing = ios->timing;
|
|
host->bus_width = ios->bus_width;
|
|
host->state = STATE_IDLE;
|
|
}
|
|
|
|
static int sh_mmcif_get_cd(struct mmc_host *mmc)
|
|
{
|
|
struct sh_mmcif_host *host = mmc_priv(mmc);
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
struct sh_mmcif_plat_data *p = dev->platform_data;
|
|
int ret = mmc_gpio_get_cd(mmc);
|
|
|
|
if (ret >= 0)
|
|
return ret;
|
|
|
|
if (!p || !p->get_cd)
|
|
return -ENOSYS;
|
|
else
|
|
return p->get_cd(host->pd);
|
|
}
|
|
|
|
static struct mmc_host_ops sh_mmcif_ops = {
|
|
.request = sh_mmcif_request,
|
|
.set_ios = sh_mmcif_set_ios,
|
|
.get_cd = sh_mmcif_get_cd,
|
|
};
|
|
|
|
static bool sh_mmcif_end_cmd(struct sh_mmcif_host *host)
|
|
{
|
|
struct mmc_command *cmd = host->mrq->cmd;
|
|
struct mmc_data *data = host->mrq->data;
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
long time;
|
|
|
|
if (host->sd_error) {
|
|
switch (cmd->opcode) {
|
|
case MMC_ALL_SEND_CID:
|
|
case MMC_SELECT_CARD:
|
|
case MMC_APP_CMD:
|
|
cmd->error = -ETIMEDOUT;
|
|
break;
|
|
default:
|
|
cmd->error = sh_mmcif_error_manage(host);
|
|
break;
|
|
}
|
|
dev_dbg(dev, "CMD%d error %d\n",
|
|
cmd->opcode, cmd->error);
|
|
host->sd_error = false;
|
|
return false;
|
|
}
|
|
if (!(cmd->flags & MMC_RSP_PRESENT)) {
|
|
cmd->error = 0;
|
|
return false;
|
|
}
|
|
|
|
sh_mmcif_get_response(host, cmd);
|
|
|
|
if (!data)
|
|
return false;
|
|
|
|
/*
|
|
* Completion can be signalled from DMA callback and error, so, have to
|
|
* reset here, before setting .dma_active
|
|
*/
|
|
init_completion(&host->dma_complete);
|
|
|
|
if (data->flags & MMC_DATA_READ) {
|
|
if (host->chan_rx)
|
|
sh_mmcif_start_dma_rx(host);
|
|
} else {
|
|
if (host->chan_tx)
|
|
sh_mmcif_start_dma_tx(host);
|
|
}
|
|
|
|
if (!host->dma_active) {
|
|
data->error = sh_mmcif_data_trans(host, host->mrq, cmd->opcode);
|
|
return !data->error;
|
|
}
|
|
|
|
/* Running in the IRQ thread, can sleep */
|
|
time = wait_for_completion_interruptible_timeout(&host->dma_complete,
|
|
host->timeout);
|
|
|
|
if (data->flags & MMC_DATA_READ)
|
|
dma_unmap_sg(host->chan_rx->device->dev,
|
|
data->sg, data->sg_len,
|
|
DMA_FROM_DEVICE);
|
|
else
|
|
dma_unmap_sg(host->chan_tx->device->dev,
|
|
data->sg, data->sg_len,
|
|
DMA_TO_DEVICE);
|
|
|
|
if (host->sd_error) {
|
|
dev_err(host->mmc->parent,
|
|
"Error IRQ while waiting for DMA completion!\n");
|
|
/* Woken up by an error IRQ: abort DMA */
|
|
data->error = sh_mmcif_error_manage(host);
|
|
} else if (!time) {
|
|
dev_err(host->mmc->parent, "DMA timeout!\n");
|
|
data->error = -ETIMEDOUT;
|
|
} else if (time < 0) {
|
|
dev_err(host->mmc->parent,
|
|
"wait_for_completion_...() error %ld!\n", time);
|
|
data->error = time;
|
|
}
|
|
sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC,
|
|
BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
|
|
host->dma_active = false;
|
|
|
|
if (data->error) {
|
|
data->bytes_xfered = 0;
|
|
/* Abort DMA */
|
|
if (data->flags & MMC_DATA_READ)
|
|
dmaengine_terminate_all(host->chan_rx);
|
|
else
|
|
dmaengine_terminate_all(host->chan_tx);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static irqreturn_t sh_mmcif_irqt(int irq, void *dev_id)
|
|
{
|
|
struct sh_mmcif_host *host = dev_id;
|
|
struct mmc_request *mrq;
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
bool wait = false;
|
|
unsigned long flags;
|
|
int wait_work;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
wait_work = host->wait_for;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
cancel_delayed_work_sync(&host->timeout_work);
|
|
|
|
mutex_lock(&host->thread_lock);
|
|
|
|
mrq = host->mrq;
|
|
if (!mrq) {
|
|
dev_dbg(dev, "IRQ thread state %u, wait %u: NULL mrq!\n",
|
|
host->state, host->wait_for);
|
|
mutex_unlock(&host->thread_lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* All handlers return true, if processing continues, and false, if the
|
|
* request has to be completed - successfully or not
|
|
*/
|
|
switch (wait_work) {
|
|
case MMCIF_WAIT_FOR_REQUEST:
|
|
/* We're too late, the timeout has already kicked in */
|
|
mutex_unlock(&host->thread_lock);
|
|
return IRQ_HANDLED;
|
|
case MMCIF_WAIT_FOR_CMD:
|
|
/* Wait for data? */
|
|
wait = sh_mmcif_end_cmd(host);
|
|
break;
|
|
case MMCIF_WAIT_FOR_MREAD:
|
|
/* Wait for more data? */
|
|
wait = sh_mmcif_mread_block(host);
|
|
break;
|
|
case MMCIF_WAIT_FOR_READ:
|
|
/* Wait for data end? */
|
|
wait = sh_mmcif_read_block(host);
|
|
break;
|
|
case MMCIF_WAIT_FOR_MWRITE:
|
|
/* Wait data to write? */
|
|
wait = sh_mmcif_mwrite_block(host);
|
|
break;
|
|
case MMCIF_WAIT_FOR_WRITE:
|
|
/* Wait for data end? */
|
|
wait = sh_mmcif_write_block(host);
|
|
break;
|
|
case MMCIF_WAIT_FOR_STOP:
|
|
if (host->sd_error) {
|
|
mrq->stop->error = sh_mmcif_error_manage(host);
|
|
dev_dbg(dev, "%s(): %d\n", __func__, mrq->stop->error);
|
|
break;
|
|
}
|
|
sh_mmcif_get_cmd12response(host, mrq->stop);
|
|
mrq->stop->error = 0;
|
|
break;
|
|
case MMCIF_WAIT_FOR_READ_END:
|
|
case MMCIF_WAIT_FOR_WRITE_END:
|
|
if (host->sd_error) {
|
|
mrq->data->error = sh_mmcif_error_manage(host);
|
|
dev_dbg(dev, "%s(): %d\n", __func__, mrq->data->error);
|
|
}
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
if (wait) {
|
|
schedule_delayed_work(&host->timeout_work, host->timeout);
|
|
/* Wait for more data */
|
|
mutex_unlock(&host->thread_lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
if (host->wait_for != MMCIF_WAIT_FOR_STOP) {
|
|
struct mmc_data *data = mrq->data;
|
|
if (!mrq->cmd->error && data && !data->error)
|
|
data->bytes_xfered =
|
|
data->blocks * data->blksz;
|
|
|
|
if (mrq->stop && !mrq->cmd->error && (!data || !data->error)) {
|
|
sh_mmcif_stop_cmd(host, mrq);
|
|
if (!mrq->stop->error) {
|
|
schedule_delayed_work(&host->timeout_work, host->timeout);
|
|
mutex_unlock(&host->thread_lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
}
|
|
}
|
|
|
|
host->wait_for = MMCIF_WAIT_FOR_REQUEST;
|
|
host->state = STATE_IDLE;
|
|
host->mrq = NULL;
|
|
mmc_request_done(host->mmc, mrq);
|
|
|
|
mutex_unlock(&host->thread_lock);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t sh_mmcif_intr(int irq, void *dev_id)
|
|
{
|
|
struct sh_mmcif_host *host = dev_id;
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
u32 state, mask;
|
|
|
|
state = sh_mmcif_readl(host->addr, MMCIF_CE_INT);
|
|
mask = sh_mmcif_readl(host->addr, MMCIF_CE_INT_MASK);
|
|
if (host->ccs_enable)
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~(state & mask));
|
|
else
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_INT, INT_CCS | ~(state & mask));
|
|
sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state & MASK_CLEAN);
|
|
|
|
if (state & ~MASK_CLEAN)
|
|
dev_dbg(dev, "IRQ state = 0x%08x incompletely cleared\n",
|
|
state);
|
|
|
|
if (state & INT_ERR_STS || state & ~INT_ALL) {
|
|
host->sd_error = true;
|
|
dev_dbg(dev, "int err state = 0x%08x\n", state);
|
|
}
|
|
if (state & ~(INT_CMD12RBE | INT_CMD12CRE)) {
|
|
if (!host->mrq)
|
|
dev_dbg(dev, "NULL IRQ state = 0x%08x\n", state);
|
|
if (!host->dma_active)
|
|
return IRQ_WAKE_THREAD;
|
|
else if (host->sd_error)
|
|
sh_mmcif_dma_complete(host);
|
|
} else {
|
|
dev_dbg(dev, "Unexpected IRQ 0x%x\n", state);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void sh_mmcif_timeout_work(struct work_struct *work)
|
|
{
|
|
struct delayed_work *d = to_delayed_work(work);
|
|
struct sh_mmcif_host *host = container_of(d, struct sh_mmcif_host, timeout_work);
|
|
struct mmc_request *mrq = host->mrq;
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
unsigned long flags;
|
|
|
|
if (host->dying)
|
|
/* Don't run after mmc_remove_host() */
|
|
return;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
if (host->state == STATE_IDLE) {
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
return;
|
|
}
|
|
|
|
dev_err(dev, "Timeout waiting for %u on CMD%u\n",
|
|
host->wait_for, mrq->cmd->opcode);
|
|
|
|
host->state = STATE_TIMEOUT;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
/*
|
|
* Handle races with cancel_delayed_work(), unless
|
|
* cancel_delayed_work_sync() is used
|
|
*/
|
|
switch (host->wait_for) {
|
|
case MMCIF_WAIT_FOR_CMD:
|
|
mrq->cmd->error = sh_mmcif_error_manage(host);
|
|
break;
|
|
case MMCIF_WAIT_FOR_STOP:
|
|
mrq->stop->error = sh_mmcif_error_manage(host);
|
|
break;
|
|
case MMCIF_WAIT_FOR_MREAD:
|
|
case MMCIF_WAIT_FOR_MWRITE:
|
|
case MMCIF_WAIT_FOR_READ:
|
|
case MMCIF_WAIT_FOR_WRITE:
|
|
case MMCIF_WAIT_FOR_READ_END:
|
|
case MMCIF_WAIT_FOR_WRITE_END:
|
|
mrq->data->error = sh_mmcif_error_manage(host);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
host->state = STATE_IDLE;
|
|
host->wait_for = MMCIF_WAIT_FOR_REQUEST;
|
|
host->mrq = NULL;
|
|
mmc_request_done(host->mmc, mrq);
|
|
}
|
|
|
|
static void sh_mmcif_init_ocr(struct sh_mmcif_host *host)
|
|
{
|
|
struct device *dev = sh_mmcif_host_to_dev(host);
|
|
struct sh_mmcif_plat_data *pd = dev->platform_data;
|
|
struct mmc_host *mmc = host->mmc;
|
|
|
|
mmc_regulator_get_supply(mmc);
|
|
|
|
if (!pd)
|
|
return;
|
|
|
|
if (!mmc->ocr_avail)
|
|
mmc->ocr_avail = pd->ocr;
|
|
else if (pd->ocr)
|
|
dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
|
|
}
|
|
|
|
static int sh_mmcif_probe(struct platform_device *pdev)
|
|
{
|
|
int ret = 0, irq[2];
|
|
struct mmc_host *mmc;
|
|
struct sh_mmcif_host *host;
|
|
struct device *dev = &pdev->dev;
|
|
struct sh_mmcif_plat_data *pd = dev->platform_data;
|
|
struct resource *res;
|
|
void __iomem *reg;
|
|
const char *name;
|
|
|
|
irq[0] = platform_get_irq(pdev, 0);
|
|
irq[1] = platform_get_irq(pdev, 1);
|
|
if (irq[0] < 0) {
|
|
dev_err(dev, "Get irq error\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
reg = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(reg))
|
|
return PTR_ERR(reg);
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct sh_mmcif_host), dev);
|
|
if (!mmc)
|
|
return -ENOMEM;
|
|
|
|
ret = mmc_of_parse(mmc);
|
|
if (ret < 0)
|
|
goto err_host;
|
|
|
|
host = mmc_priv(mmc);
|
|
host->mmc = mmc;
|
|
host->addr = reg;
|
|
host->timeout = msecs_to_jiffies(10000);
|
|
host->ccs_enable = !pd || !pd->ccs_unsupported;
|
|
host->clk_ctrl2_enable = pd && pd->clk_ctrl2_present;
|
|
|
|
host->pd = pdev;
|
|
|
|
spin_lock_init(&host->lock);
|
|
|
|
mmc->ops = &sh_mmcif_ops;
|
|
sh_mmcif_init_ocr(host);
|
|
|
|
mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_WAIT_WHILE_BUSY;
|
|
mmc->caps2 |= MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO;
|
|
mmc->max_busy_timeout = 10000;
|
|
|
|
if (pd && pd->caps)
|
|
mmc->caps |= pd->caps;
|
|
mmc->max_segs = 32;
|
|
mmc->max_blk_size = 512;
|
|
mmc->max_req_size = PAGE_SIZE * mmc->max_segs;
|
|
mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size;
|
|
mmc->max_seg_size = mmc->max_req_size;
|
|
|
|
platform_set_drvdata(pdev, host);
|
|
|
|
host->clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(host->clk)) {
|
|
ret = PTR_ERR(host->clk);
|
|
dev_err(dev, "cannot get clock: %d\n", ret);
|
|
goto err_host;
|
|
}
|
|
|
|
ret = clk_prepare_enable(host->clk);
|
|
if (ret < 0)
|
|
goto err_host;
|
|
|
|
sh_mmcif_clk_setup(host);
|
|
|
|
pm_runtime_enable(dev);
|
|
host->power = false;
|
|
|
|
ret = pm_runtime_get_sync(dev);
|
|
if (ret < 0)
|
|
goto err_clk;
|
|
|
|
INIT_DELAYED_WORK(&host->timeout_work, sh_mmcif_timeout_work);
|
|
|
|
sh_mmcif_sync_reset(host);
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
|
|
|
|
name = irq[1] < 0 ? dev_name(dev) : "sh_mmc:error";
|
|
ret = devm_request_threaded_irq(dev, irq[0], sh_mmcif_intr,
|
|
sh_mmcif_irqt, 0, name, host);
|
|
if (ret) {
|
|
dev_err(dev, "request_irq error (%s)\n", name);
|
|
goto err_clk;
|
|
}
|
|
if (irq[1] >= 0) {
|
|
ret = devm_request_threaded_irq(dev, irq[1],
|
|
sh_mmcif_intr, sh_mmcif_irqt,
|
|
0, "sh_mmc:int", host);
|
|
if (ret) {
|
|
dev_err(dev, "request_irq error (sh_mmc:int)\n");
|
|
goto err_clk;
|
|
}
|
|
}
|
|
|
|
if (pd && pd->use_cd_gpio) {
|
|
ret = mmc_gpio_request_cd(mmc, pd->cd_gpio, 0);
|
|
if (ret < 0)
|
|
goto err_clk;
|
|
}
|
|
|
|
mutex_init(&host->thread_lock);
|
|
|
|
ret = mmc_add_host(mmc);
|
|
if (ret < 0)
|
|
goto err_clk;
|
|
|
|
dev_pm_qos_expose_latency_limit(dev, 100);
|
|
|
|
dev_info(dev, "Chip version 0x%04x, clock rate %luMHz\n",
|
|
sh_mmcif_readl(host->addr, MMCIF_CE_VERSION) & 0xffff,
|
|
clk_get_rate(host->clk) / 1000000UL);
|
|
|
|
pm_runtime_put(dev);
|
|
clk_disable_unprepare(host->clk);
|
|
return ret;
|
|
|
|
err_clk:
|
|
clk_disable_unprepare(host->clk);
|
|
pm_runtime_put_sync(dev);
|
|
pm_runtime_disable(dev);
|
|
err_host:
|
|
mmc_free_host(mmc);
|
|
return ret;
|
|
}
|
|
|
|
static int sh_mmcif_remove(struct platform_device *pdev)
|
|
{
|
|
struct sh_mmcif_host *host = platform_get_drvdata(pdev);
|
|
|
|
host->dying = true;
|
|
clk_prepare_enable(host->clk);
|
|
pm_runtime_get_sync(&pdev->dev);
|
|
|
|
dev_pm_qos_hide_latency_limit(&pdev->dev);
|
|
|
|
mmc_remove_host(host->mmc);
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
|
|
|
|
/*
|
|
* FIXME: cancel_delayed_work(_sync)() and free_irq() race with the
|
|
* mmc_remove_host() call above. But swapping order doesn't help either
|
|
* (a query on the linux-mmc mailing list didn't bring any replies).
|
|
*/
|
|
cancel_delayed_work_sync(&host->timeout_work);
|
|
|
|
clk_disable_unprepare(host->clk);
|
|
mmc_free_host(host->mmc);
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int sh_mmcif_suspend(struct device *dev)
|
|
{
|
|
struct sh_mmcif_host *host = dev_get_drvdata(dev);
|
|
|
|
pm_runtime_get_sync(dev);
|
|
sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
|
|
pm_runtime_put(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sh_mmcif_resume(struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct dev_pm_ops sh_mmcif_dev_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(sh_mmcif_suspend, sh_mmcif_resume)
|
|
};
|
|
|
|
static struct platform_driver sh_mmcif_driver = {
|
|
.probe = sh_mmcif_probe,
|
|
.remove = sh_mmcif_remove,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.pm = &sh_mmcif_dev_pm_ops,
|
|
.of_match_table = sh_mmcif_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(sh_mmcif_driver);
|
|
|
|
MODULE_DESCRIPTION("SuperH on-chip MMC/eMMC interface driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|
|
MODULE_AUTHOR("Yusuke Goda <yusuke.goda.sx@renesas.com>");
|