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linux/drivers/mmc/host/tmio_mmc.h
Allen Pais 85683fb39d mmc: sdhi: Convert from tasklet to BH workqueue 
The only generic interface to execute asynchronously in the BH context is
tasklet; however, it's marked deprecated and has some design flaws. To
replace tasklets, BH workqueue support was recently added. A BH workqueue
behaves similarly to regular workqueues except that the queued work items
are executed in the BH context.

This patch converts the SDHI driver from tasklet to BH workqueue.

Based on the work done by Tejun Heo <tj@kernel.org>

Signed-off-by: Allen Pais <allen.lkml@gmail.com>
[wsa: fixed build faliures, corrected whitespace issues]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20240626085015.32171-2-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2024-07-08 11:35:18 +02:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver for the MMC / SD / SDIO cell found in:
*
* TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
*
* Copyright (C) 2015-19 Renesas Electronics Corporation
* Copyright (C) 2016-19 Sang Engineering, Wolfram Sang
* Copyright (C) 2016-17 Horms Solutions, Simon Horman
* Copyright (C) 2007 Ian Molton
* Copyright (C) 2004 Ian Molton
*/
#ifndef TMIO_MMC_H
#define TMIO_MMC_H
#include <linux/dmaengine.h>
#include <linux/highmem.h>
#include <linux/mutex.h>
#include <linux/pagemap.h>
#include <linux/scatterlist.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#define CTL_SD_CMD 0x00
#define CTL_ARG_REG 0x04
#define CTL_STOP_INTERNAL_ACTION 0x08
#define CTL_XFER_BLK_COUNT 0xa
#define CTL_RESPONSE 0x0c
/* driver merges STATUS and following STATUS2 */
#define CTL_STATUS 0x1c
/* driver merges IRQ_MASK and following IRQ_MASK2 */
#define CTL_IRQ_MASK 0x20
#define CTL_SD_CARD_CLK_CTL 0x24
#define CTL_SD_XFER_LEN 0x26
#define CTL_SD_MEM_CARD_OPT 0x28
#define CTL_SD_ERROR_DETAIL_STATUS 0x2c
#define CTL_SD_DATA_PORT 0x30
#define CTL_TRANSACTION_CTL 0x34
#define CTL_SDIO_STATUS 0x36
#define CTL_SDIO_IRQ_MASK 0x38
#define CTL_DMA_ENABLE 0xd8
#define CTL_RESET_SD 0xe0
#define CTL_VERSION 0xe2
#define CTL_SDIF_MODE 0xe6 /* only known on R-Car 2+ */
/* Definitions for values the CTL_STOP_INTERNAL_ACTION register can take */
#define TMIO_STOP_STP BIT(0)
#define TMIO_STOP_SEC BIT(8)
/* Definitions for values the CTL_STATUS register can take */
#define TMIO_STAT_CMDRESPEND BIT(0)
#define TMIO_STAT_DATAEND BIT(2)
#define TMIO_STAT_CARD_REMOVE BIT(3)
#define TMIO_STAT_CARD_INSERT BIT(4)
#define TMIO_STAT_SIGSTATE BIT(5)
#define TMIO_STAT_WRPROTECT BIT(7)
#define TMIO_STAT_CARD_REMOVE_A BIT(8)
#define TMIO_STAT_CARD_INSERT_A BIT(9)
#define TMIO_STAT_SIGSTATE_A BIT(10)
/* These belong technically to CTL_STATUS2, but the driver merges them */
#define TMIO_STAT_CMD_IDX_ERR BIT(16)
#define TMIO_STAT_CRCFAIL BIT(17)
#define TMIO_STAT_STOPBIT_ERR BIT(18)
#define TMIO_STAT_DATATIMEOUT BIT(19)
#define TMIO_STAT_RXOVERFLOW BIT(20)
#define TMIO_STAT_TXUNDERRUN BIT(21)
#define TMIO_STAT_CMDTIMEOUT BIT(22)
#define TMIO_STAT_DAT0 BIT(23) /* only known on R-Car so far */
#define TMIO_STAT_RXRDY BIT(24)
#define TMIO_STAT_TXRQ BIT(25)
#define TMIO_STAT_ALWAYS_SET_27 BIT(27) /* only known on R-Car 2+ so far */
#define TMIO_STAT_ILL_FUNC BIT(29) /* only when !TMIO_MMC_HAS_IDLE_WAIT */
#define TMIO_STAT_SCLKDIVEN BIT(29) /* only when TMIO_MMC_HAS_IDLE_WAIT */
#define TMIO_STAT_CMD_BUSY BIT(30)
#define TMIO_STAT_ILL_ACCESS BIT(31)
/* Definitions for values the CTL_SD_CARD_CLK_CTL register can take */
#define CLK_CTL_DIV_MASK 0xff
#define CLK_CTL_SCLKEN BIT(8)
/* Definitions for values the CTL_SD_MEM_CARD_OPT register can take */
#define CARD_OPT_TOP_MASK 0xf0
#define CARD_OPT_TOP_SHIFT 4
#define CARD_OPT_EXTOP BIT(9) /* first appeared on R-Car Gen3 SDHI */
#define CARD_OPT_WIDTH8 BIT(13)
#define CARD_OPT_ALWAYS1 BIT(14)
#define CARD_OPT_WIDTH BIT(15)
/* Definitions for values the CTL_SDIO_STATUS register can take */
#define TMIO_SDIO_STAT_IOIRQ 0x0001
#define TMIO_SDIO_STAT_EXPUB52 0x4000
#define TMIO_SDIO_STAT_EXWT 0x8000
#define TMIO_SDIO_MASK_ALL 0xc007
#define TMIO_SDIO_SETBITS_MASK 0x0006
/* Definitions for values the CTL_DMA_ENABLE register can take */
#define DMA_ENABLE_DMASDRW BIT(1)
/* Definitions for values the CTL_SDIF_MODE register can take */
#define SDIF_MODE_HS400 BIT(0) /* only known on R-Car 2+ */
/* Define some IRQ masks */
/* This is the mask used at reset by the chip */
#define TMIO_MASK_ALL 0x837f031d
#define TMIO_MASK_ALL_RCAR2 0x8b7f031d
#define TMIO_MASK_READOP (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
#define TMIO_MASK_CMD (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
#define TMIO_MASK_IRQ (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
#define TMIO_MAX_BLK_SIZE 512
struct tmio_mmc_data;
struct tmio_mmc_host;
struct tmio_mmc_dma_ops {
void (*start)(struct tmio_mmc_host *host, struct mmc_data *data);
void (*enable)(struct tmio_mmc_host *host, bool enable);
void (*request)(struct tmio_mmc_host *host,
struct tmio_mmc_data *pdata);
void (*release)(struct tmio_mmc_host *host);
void (*abort)(struct tmio_mmc_host *host);
void (*dataend)(struct tmio_mmc_host *host);
/* optional */
void (*end)(struct tmio_mmc_host *host); /* held host->lock */
bool (*dma_irq)(struct tmio_mmc_host *host);
};
struct tmio_mmc_host {
void __iomem *ctl;
struct mmc_command *cmd;
struct mmc_request *mrq;
struct mmc_data *data;
struct mmc_host *mmc;
struct mmc_host_ops ops;
/* pio related stuff */
struct scatterlist *sg_ptr;
struct scatterlist *sg_orig;
unsigned int sg_len;
unsigned int sg_off;
unsigned int bus_shift;
struct platform_device *pdev;
struct tmio_mmc_data *pdata;
/* DMA support */
bool dma_on;
struct dma_chan *chan_rx;
struct dma_chan *chan_tx;
struct work_struct dma_issue;
struct scatterlist bounce_sg;
u8 *bounce_buf;
/* Track lost interrupts */
struct delayed_work delayed_reset_work;
struct work_struct done;
/* Cache */
u32 sdcard_irq_mask;
u32 sdio_irq_mask;
unsigned int clk_cache;
u32 sdcard_irq_setbit_mask;
u32 sdcard_irq_mask_all;
spinlock_t lock; /* protect host private data */
unsigned long last_req_ts;
struct mutex ios_lock; /* protect set_ios() context */
bool native_hotplug;
bool sdio_irq_enabled;
/* Mandatory callback */
int (*clk_enable)(struct tmio_mmc_host *host);
void (*set_clock)(struct tmio_mmc_host *host, unsigned int clock);
/* Optional callbacks */
void (*clk_disable)(struct tmio_mmc_host *host);
int (*multi_io_quirk)(struct mmc_card *card,
unsigned int direction, int blk_size);
int (*write16_hook)(struct tmio_mmc_host *host, int addr);
void (*reset)(struct tmio_mmc_host *host, bool preserve);
bool (*check_retune)(struct tmio_mmc_host *host, struct mmc_request *mrq);
void (*fixup_request)(struct tmio_mmc_host *host, struct mmc_request *mrq);
unsigned int (*get_timeout_cycles)(struct tmio_mmc_host *host);
const struct tmio_mmc_dma_ops *dma_ops;
};
struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev,
struct tmio_mmc_data *pdata);
void tmio_mmc_host_free(struct tmio_mmc_host *host);
int tmio_mmc_host_probe(struct tmio_mmc_host *host);
void tmio_mmc_host_remove(struct tmio_mmc_host *host);
void tmio_mmc_do_data_irq(struct tmio_mmc_host *host);
void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
irqreturn_t tmio_mmc_irq(int irq, void *devid);
#ifdef CONFIG_PM
int tmio_mmc_host_runtime_suspend(struct device *dev);
int tmio_mmc_host_runtime_resume(struct device *dev);
#endif
static inline u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
{
return ioread16(host->ctl + (addr << host->bus_shift));
}
static inline void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
u16 *buf, int count)
{
ioread16_rep(host->ctl + (addr << host->bus_shift), buf, count);
}
static inline u32 sd_ctrl_read16_and_16_as_32(struct tmio_mmc_host *host,
int addr)
{
return ioread16(host->ctl + (addr << host->bus_shift)) |
ioread16(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
}
static inline void sd_ctrl_read32_rep(struct tmio_mmc_host *host, int addr,
u32 *buf, int count)
{
ioread32_rep(host->ctl + (addr << host->bus_shift), buf, count);
}
static inline void sd_ctrl_write16(struct tmio_mmc_host *host, int addr,
u16 val)
{
/* If there is a hook and it returns non-zero then there
* is an error and the write should be skipped
*/
if (host->write16_hook && host->write16_hook(host, addr))
return;
iowrite16(val, host->ctl + (addr << host->bus_shift));
}
static inline void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
u16 *buf, int count)
{
iowrite16_rep(host->ctl + (addr << host->bus_shift), buf, count);
}
static inline void sd_ctrl_write32_as_16_and_16(struct tmio_mmc_host *host,
int addr, u32 val)
{
if (addr == CTL_IRQ_MASK || addr == CTL_STATUS)
val |= host->sdcard_irq_setbit_mask;
iowrite16(val & 0xffff, host->ctl + (addr << host->bus_shift));
iowrite16(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
}
static inline void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
{
iowrite32(val, host->ctl + (addr << host->bus_shift));
}
static inline void sd_ctrl_write32_rep(struct tmio_mmc_host *host, int addr,
const u32 *buf, int count)
{
iowrite32_rep(host->ctl + (addr << host->bus_shift), buf, count);
}
#endif
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