forked from luck/tmp_suning_uos_patched
e83b7a8acc
With MMC clock gating enabled the MMC core currently calls MMC host driver's .set_ios() method with .power_mode == MMC_POWER_ON and the clock value set either to 0 or to the target rate. The tmio MMC driver then wrongly translates the latter calls to card slot power-on requests, even when the slot already was on. This patch fixes the driver to avoid needlessly incrementing power-supplying regulator's use count. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Chris Ball <cjb@laptop.org>
218 lines
6.5 KiB
C
218 lines
6.5 KiB
C
/*
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* linux/drivers/mmc/host/tmio_mmc.h
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*
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* Copyright (C) 2007 Ian Molton
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* Copyright (C) 2004 Ian Molton
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* Driver for the MMC / SD / SDIO cell found in:
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*
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* TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
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*/
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#ifndef TMIO_MMC_H
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#define TMIO_MMC_H
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#include <linux/highmem.h>
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#include <linux/mmc/tmio.h>
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#include <linux/mutex.h>
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#include <linux/pagemap.h>
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#include <linux/scatterlist.h>
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#include <linux/spinlock.h>
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/* Definitions for values the CTRL_SDIO_STATUS register can take. */
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#define TMIO_SDIO_STAT_IOIRQ 0x0001
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#define TMIO_SDIO_STAT_EXPUB52 0x4000
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#define TMIO_SDIO_STAT_EXWT 0x8000
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#define TMIO_SDIO_MASK_ALL 0xc007
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/* Define some IRQ masks */
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/* This is the mask used at reset by the chip */
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#define TMIO_MASK_ALL 0x837f031d
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#define TMIO_MASK_READOP (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
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#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
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#define TMIO_MASK_CMD (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
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TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
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#define TMIO_MASK_IRQ (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
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struct tmio_mmc_data;
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/*
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* We differentiate between the following 3 power states:
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* 1. card slot powered off, controller stopped. This is used, when either there
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* is no card in the slot, or the card really has to be powered down.
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* 2. card slot powered on, controller stopped. This is used, when a card is in
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* the slot, but no activity is currently taking place. This is a power-
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* saving mode with card-state preserved. This state can be entered, e.g.
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* when MMC clock-gating is used.
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* 3. card slot powered on, controller running. This is the actual active state.
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*/
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enum tmio_mmc_power {
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TMIO_MMC_OFF_STOP, /* card power off, controller stopped */
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TMIO_MMC_ON_STOP, /* card power on, controller stopped */
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TMIO_MMC_ON_RUN, /* card power on, controller running */
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};
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struct tmio_mmc_host {
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void __iomem *ctl;
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unsigned long bus_shift;
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struct mmc_command *cmd;
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struct mmc_request *mrq;
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struct mmc_data *data;
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struct mmc_host *mmc;
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/* Controller and card power state */
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enum tmio_mmc_power power;
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/* Callbacks for clock / power control */
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void (*set_pwr)(struct platform_device *host, int state);
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void (*set_clk_div)(struct platform_device *host, int state);
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/* pio related stuff */
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struct scatterlist *sg_ptr;
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struct scatterlist *sg_orig;
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unsigned int sg_len;
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unsigned int sg_off;
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struct platform_device *pdev;
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struct tmio_mmc_data *pdata;
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/* DMA support */
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bool force_pio;
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struct dma_chan *chan_rx;
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struct dma_chan *chan_tx;
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struct tasklet_struct dma_complete;
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struct tasklet_struct dma_issue;
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struct scatterlist bounce_sg;
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u8 *bounce_buf;
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/* Track lost interrupts */
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struct delayed_work delayed_reset_work;
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struct work_struct done;
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/* Cache IRQ mask */
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u32 sdcard_irq_mask;
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u32 sdio_irq_mask;
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spinlock_t lock; /* protect host private data */
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unsigned long last_req_ts;
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struct mutex ios_lock; /* protect set_ios() context */
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bool native_hotplug;
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bool resuming;
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};
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int tmio_mmc_host_probe(struct tmio_mmc_host **host,
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struct platform_device *pdev,
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struct tmio_mmc_data *pdata);
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void tmio_mmc_host_remove(struct tmio_mmc_host *host);
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void tmio_mmc_do_data_irq(struct tmio_mmc_host *host);
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void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
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void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
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irqreturn_t tmio_mmc_irq(int irq, void *devid);
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irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid);
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irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid);
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irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid);
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static inline char *tmio_mmc_kmap_atomic(struct scatterlist *sg,
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unsigned long *flags)
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{
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local_irq_save(*flags);
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return kmap_atomic(sg_page(sg)) + sg->offset;
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}
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static inline void tmio_mmc_kunmap_atomic(struct scatterlist *sg,
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unsigned long *flags, void *virt)
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{
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kunmap_atomic(virt - sg->offset);
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local_irq_restore(*flags);
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}
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#if defined(CONFIG_MMC_SDHI) || defined(CONFIG_MMC_SDHI_MODULE)
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void tmio_mmc_start_dma(struct tmio_mmc_host *host, struct mmc_data *data);
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void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable);
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void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata);
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void tmio_mmc_release_dma(struct tmio_mmc_host *host);
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void tmio_mmc_abort_dma(struct tmio_mmc_host *host);
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#else
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static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
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struct mmc_data *data)
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{
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}
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static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
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{
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}
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static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
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struct tmio_mmc_data *pdata)
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{
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host->chan_tx = NULL;
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host->chan_rx = NULL;
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}
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static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
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{
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}
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static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
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{
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}
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#endif
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#ifdef CONFIG_PM
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int tmio_mmc_host_suspend(struct device *dev);
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int tmio_mmc_host_resume(struct device *dev);
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#else
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#define tmio_mmc_host_suspend NULL
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#define tmio_mmc_host_resume NULL
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#endif
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int tmio_mmc_host_runtime_suspend(struct device *dev);
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int tmio_mmc_host_runtime_resume(struct device *dev);
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static inline u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
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{
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return readw(host->ctl + (addr << host->bus_shift));
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}
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static inline void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
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u16 *buf, int count)
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{
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readsw(host->ctl + (addr << host->bus_shift), buf, count);
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}
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static inline u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr)
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{
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return readw(host->ctl + (addr << host->bus_shift)) |
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readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
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}
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static inline void sd_ctrl_write16(struct tmio_mmc_host *host, int addr, u16 val)
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{
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/* If there is a hook and it returns non-zero then there
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* is an error and the write should be skipped
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*/
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if (host->pdata->write16_hook && host->pdata->write16_hook(host, addr))
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return;
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writew(val, host->ctl + (addr << host->bus_shift));
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}
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static inline void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
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u16 *buf, int count)
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{
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writesw(host->ctl + (addr << host->bus_shift), buf, count);
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}
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static inline void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
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{
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writew(val, host->ctl + (addr << host->bus_shift));
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writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
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}
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#endif
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