![Uwe Kleine-König](/assets/img/avatar_default.png)
A pointer to mmc_omap_probe which lives in .init.text is passed to the core via platform_driver_register and so the kernel might oops if probe is called after the init code is discarded. As requested by David Brownell platform_driver_probe is used instead of moving the probe function to .devinit.text. This saves some memory, but might have the downside that a device being registered after the call to mmc_omap_init but before the init sections are discarded will not be bound anymore to the driver. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Pierre Ossman <pierre@ossman.eu>
1622 lines
39 KiB
C
1622 lines
39 KiB
C
/*
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* linux/drivers/mmc/host/omap.c
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*
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* Copyright (C) 2004 Nokia Corporation
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* Written by Tuukka Tikkanen and Juha Yrjölä<juha.yrjola@nokia.com>
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* Misc hacks here and there by Tony Lindgren <tony@atomide.com>
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* Other hacks (DMA, SD, etc) by David Brownell
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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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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/clk.h>
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#include <linux/scatterlist.h>
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#include <linux/i2c/tps65010.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <mach/board.h>
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#include <mach/mmc.h>
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#include <mach/gpio.h>
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#include <mach/dma.h>
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#include <mach/mux.h>
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#include <mach/fpga.h>
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#define OMAP_MMC_REG_CMD 0x00
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#define OMAP_MMC_REG_ARGL 0x04
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#define OMAP_MMC_REG_ARGH 0x08
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#define OMAP_MMC_REG_CON 0x0c
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#define OMAP_MMC_REG_STAT 0x10
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#define OMAP_MMC_REG_IE 0x14
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#define OMAP_MMC_REG_CTO 0x18
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#define OMAP_MMC_REG_DTO 0x1c
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#define OMAP_MMC_REG_DATA 0x20
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#define OMAP_MMC_REG_BLEN 0x24
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#define OMAP_MMC_REG_NBLK 0x28
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#define OMAP_MMC_REG_BUF 0x2c
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#define OMAP_MMC_REG_SDIO 0x34
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#define OMAP_MMC_REG_REV 0x3c
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#define OMAP_MMC_REG_RSP0 0x40
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#define OMAP_MMC_REG_RSP1 0x44
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#define OMAP_MMC_REG_RSP2 0x48
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#define OMAP_MMC_REG_RSP3 0x4c
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#define OMAP_MMC_REG_RSP4 0x50
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#define OMAP_MMC_REG_RSP5 0x54
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#define OMAP_MMC_REG_RSP6 0x58
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#define OMAP_MMC_REG_RSP7 0x5c
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#define OMAP_MMC_REG_IOSR 0x60
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#define OMAP_MMC_REG_SYSC 0x64
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#define OMAP_MMC_REG_SYSS 0x68
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#define OMAP_MMC_STAT_CARD_ERR (1 << 14)
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#define OMAP_MMC_STAT_CARD_IRQ (1 << 13)
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#define OMAP_MMC_STAT_OCR_BUSY (1 << 12)
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#define OMAP_MMC_STAT_A_EMPTY (1 << 11)
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#define OMAP_MMC_STAT_A_FULL (1 << 10)
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#define OMAP_MMC_STAT_CMD_CRC (1 << 8)
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#define OMAP_MMC_STAT_CMD_TOUT (1 << 7)
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#define OMAP_MMC_STAT_DATA_CRC (1 << 6)
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#define OMAP_MMC_STAT_DATA_TOUT (1 << 5)
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#define OMAP_MMC_STAT_END_BUSY (1 << 4)
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#define OMAP_MMC_STAT_END_OF_DATA (1 << 3)
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#define OMAP_MMC_STAT_CARD_BUSY (1 << 2)
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#define OMAP_MMC_STAT_END_OF_CMD (1 << 0)
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#define OMAP_MMC_READ(host, reg) __raw_readw((host)->virt_base + OMAP_MMC_REG_##reg)
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#define OMAP_MMC_WRITE(host, reg, val) __raw_writew((val), (host)->virt_base + OMAP_MMC_REG_##reg)
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/*
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* Command types
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*/
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#define OMAP_MMC_CMDTYPE_BC 0
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#define OMAP_MMC_CMDTYPE_BCR 1
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#define OMAP_MMC_CMDTYPE_AC 2
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#define OMAP_MMC_CMDTYPE_ADTC 3
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#define DRIVER_NAME "mmci-omap"
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/* Specifies how often in millisecs to poll for card status changes
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* when the cover switch is open */
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#define OMAP_MMC_COVER_POLL_DELAY 500
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struct mmc_omap_host;
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struct mmc_omap_slot {
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int id;
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unsigned int vdd;
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u16 saved_con;
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u16 bus_mode;
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unsigned int fclk_freq;
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unsigned powered:1;
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struct tasklet_struct cover_tasklet;
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struct timer_list cover_timer;
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unsigned cover_open;
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struct mmc_request *mrq;
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struct mmc_omap_host *host;
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struct mmc_host *mmc;
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struct omap_mmc_slot_data *pdata;
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};
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struct mmc_omap_host {
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int initialized;
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int suspended;
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struct mmc_request * mrq;
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struct mmc_command * cmd;
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struct mmc_data * data;
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struct mmc_host * mmc;
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struct device * dev;
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unsigned char id; /* 16xx chips have 2 MMC blocks */
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struct clk * iclk;
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struct clk * fclk;
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struct resource *mem_res;
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void __iomem *virt_base;
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unsigned int phys_base;
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int irq;
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unsigned char bus_mode;
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unsigned char hw_bus_mode;
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struct work_struct cmd_abort_work;
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unsigned abort:1;
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struct timer_list cmd_abort_timer;
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struct work_struct slot_release_work;
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struct mmc_omap_slot *next_slot;
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struct work_struct send_stop_work;
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struct mmc_data *stop_data;
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unsigned int sg_len;
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int sg_idx;
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u16 * buffer;
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u32 buffer_bytes_left;
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u32 total_bytes_left;
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unsigned use_dma:1;
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unsigned brs_received:1, dma_done:1;
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unsigned dma_is_read:1;
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unsigned dma_in_use:1;
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int dma_ch;
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spinlock_t dma_lock;
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struct timer_list dma_timer;
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unsigned dma_len;
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struct mmc_omap_slot *slots[OMAP_MMC_MAX_SLOTS];
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struct mmc_omap_slot *current_slot;
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spinlock_t slot_lock;
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wait_queue_head_t slot_wq;
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int nr_slots;
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struct timer_list clk_timer;
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spinlock_t clk_lock; /* for changing enabled state */
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unsigned int fclk_enabled:1;
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struct omap_mmc_platform_data *pdata;
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};
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static void mmc_omap_fclk_offdelay(struct mmc_omap_slot *slot)
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{
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unsigned long tick_ns;
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if (slot != NULL && slot->host->fclk_enabled && slot->fclk_freq > 0) {
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tick_ns = (1000000000 + slot->fclk_freq - 1) / slot->fclk_freq;
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ndelay(8 * tick_ns);
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}
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}
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static void mmc_omap_fclk_enable(struct mmc_omap_host *host, unsigned int enable)
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{
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unsigned long flags;
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spin_lock_irqsave(&host->clk_lock, flags);
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if (host->fclk_enabled != enable) {
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host->fclk_enabled = enable;
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if (enable)
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clk_enable(host->fclk);
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else
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clk_disable(host->fclk);
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}
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spin_unlock_irqrestore(&host->clk_lock, flags);
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}
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static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed)
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{
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struct mmc_omap_host *host = slot->host;
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unsigned long flags;
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if (claimed)
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goto no_claim;
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spin_lock_irqsave(&host->slot_lock, flags);
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while (host->mmc != NULL) {
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spin_unlock_irqrestore(&host->slot_lock, flags);
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wait_event(host->slot_wq, host->mmc == NULL);
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spin_lock_irqsave(&host->slot_lock, flags);
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}
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host->mmc = slot->mmc;
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spin_unlock_irqrestore(&host->slot_lock, flags);
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no_claim:
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del_timer(&host->clk_timer);
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if (host->current_slot != slot || !claimed)
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mmc_omap_fclk_offdelay(host->current_slot);
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if (host->current_slot != slot) {
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OMAP_MMC_WRITE(host, CON, slot->saved_con & 0xFC00);
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if (host->pdata->switch_slot != NULL)
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host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id);
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host->current_slot = slot;
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}
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if (claimed) {
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mmc_omap_fclk_enable(host, 1);
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/* Doing the dummy read here seems to work around some bug
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* at least in OMAP24xx silicon where the command would not
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* start after writing the CMD register. Sigh. */
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OMAP_MMC_READ(host, CON);
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OMAP_MMC_WRITE(host, CON, slot->saved_con);
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} else
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mmc_omap_fclk_enable(host, 0);
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}
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static void mmc_omap_start_request(struct mmc_omap_host *host,
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struct mmc_request *req);
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static void mmc_omap_slot_release_work(struct work_struct *work)
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{
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struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
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slot_release_work);
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struct mmc_omap_slot *next_slot = host->next_slot;
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struct mmc_request *rq;
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host->next_slot = NULL;
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mmc_omap_select_slot(next_slot, 1);
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rq = next_slot->mrq;
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next_slot->mrq = NULL;
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mmc_omap_start_request(host, rq);
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}
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static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled)
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{
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struct mmc_omap_host *host = slot->host;
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unsigned long flags;
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int i;
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BUG_ON(slot == NULL || host->mmc == NULL);
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if (clk_enabled)
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/* Keeps clock running for at least 8 cycles on valid freq */
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mod_timer(&host->clk_timer, jiffies + HZ/10);
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else {
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del_timer(&host->clk_timer);
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mmc_omap_fclk_offdelay(slot);
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mmc_omap_fclk_enable(host, 0);
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}
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spin_lock_irqsave(&host->slot_lock, flags);
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/* Check for any pending requests */
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for (i = 0; i < host->nr_slots; i++) {
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struct mmc_omap_slot *new_slot;
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if (host->slots[i] == NULL || host->slots[i]->mrq == NULL)
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continue;
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BUG_ON(host->next_slot != NULL);
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new_slot = host->slots[i];
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/* The current slot should not have a request in queue */
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BUG_ON(new_slot == host->current_slot);
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host->next_slot = new_slot;
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host->mmc = new_slot->mmc;
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spin_unlock_irqrestore(&host->slot_lock, flags);
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schedule_work(&host->slot_release_work);
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return;
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}
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host->mmc = NULL;
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wake_up(&host->slot_wq);
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spin_unlock_irqrestore(&host->slot_lock, flags);
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}
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static inline
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int mmc_omap_cover_is_open(struct mmc_omap_slot *slot)
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{
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if (slot->pdata->get_cover_state)
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return slot->pdata->get_cover_state(mmc_dev(slot->mmc),
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slot->id);
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return 0;
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}
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static ssize_t
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mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
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struct mmc_omap_slot *slot = mmc_priv(mmc);
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return sprintf(buf, "%s\n", mmc_omap_cover_is_open(slot) ? "open" :
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"closed");
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}
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static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
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static ssize_t
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mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
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struct mmc_omap_slot *slot = mmc_priv(mmc);
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return sprintf(buf, "%s\n", slot->pdata->name);
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}
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static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
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static void
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mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
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{
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u32 cmdreg;
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u32 resptype;
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u32 cmdtype;
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host->cmd = cmd;
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resptype = 0;
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cmdtype = 0;
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/* Our hardware needs to know exact type */
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switch (mmc_resp_type(cmd)) {
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case MMC_RSP_NONE:
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break;
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case MMC_RSP_R1:
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case MMC_RSP_R1B:
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/* resp 1, 1b, 6, 7 */
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resptype = 1;
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break;
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case MMC_RSP_R2:
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resptype = 2;
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break;
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case MMC_RSP_R3:
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resptype = 3;
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break;
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default:
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dev_err(mmc_dev(host->mmc), "Invalid response type: %04x\n", mmc_resp_type(cmd));
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break;
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}
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if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
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cmdtype = OMAP_MMC_CMDTYPE_ADTC;
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} else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
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cmdtype = OMAP_MMC_CMDTYPE_BC;
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} else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
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cmdtype = OMAP_MMC_CMDTYPE_BCR;
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} else {
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cmdtype = OMAP_MMC_CMDTYPE_AC;
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}
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cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
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if (host->current_slot->bus_mode == MMC_BUSMODE_OPENDRAIN)
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cmdreg |= 1 << 6;
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if (cmd->flags & MMC_RSP_BUSY)
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cmdreg |= 1 << 11;
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if (host->data && !(host->data->flags & MMC_DATA_WRITE))
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cmdreg |= 1 << 15;
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mod_timer(&host->cmd_abort_timer, jiffies + HZ/2);
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OMAP_MMC_WRITE(host, CTO, 200);
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OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
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OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
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OMAP_MMC_WRITE(host, IE,
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OMAP_MMC_STAT_A_EMPTY | OMAP_MMC_STAT_A_FULL |
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OMAP_MMC_STAT_CMD_CRC | OMAP_MMC_STAT_CMD_TOUT |
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OMAP_MMC_STAT_DATA_CRC | OMAP_MMC_STAT_DATA_TOUT |
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OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR |
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OMAP_MMC_STAT_END_OF_DATA);
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OMAP_MMC_WRITE(host, CMD, cmdreg);
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}
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static void
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mmc_omap_release_dma(struct mmc_omap_host *host, struct mmc_data *data,
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int abort)
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{
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enum dma_data_direction dma_data_dir;
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BUG_ON(host->dma_ch < 0);
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if (data->error)
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omap_stop_dma(host->dma_ch);
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/* Release DMA channel lazily */
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mod_timer(&host->dma_timer, jiffies + HZ);
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if (data->flags & MMC_DATA_WRITE)
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dma_data_dir = DMA_TO_DEVICE;
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else
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dma_data_dir = DMA_FROM_DEVICE;
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dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
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dma_data_dir);
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}
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static void mmc_omap_send_stop_work(struct work_struct *work)
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{
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struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
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send_stop_work);
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struct mmc_omap_slot *slot = host->current_slot;
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struct mmc_data *data = host->stop_data;
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unsigned long tick_ns;
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tick_ns = (1000000000 + slot->fclk_freq - 1)/slot->fclk_freq;
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ndelay(8*tick_ns);
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mmc_omap_start_command(host, data->stop);
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}
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static void
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mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
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{
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if (host->dma_in_use)
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mmc_omap_release_dma(host, data, data->error);
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host->data = NULL;
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host->sg_len = 0;
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/* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
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* dozens of requests until the card finishes writing data.
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* It'd be cheaper to just wait till an EOFB interrupt arrives...
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*/
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if (!data->stop) {
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struct mmc_host *mmc;
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host->mrq = NULL;
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mmc = host->mmc;
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mmc_omap_release_slot(host->current_slot, 1);
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mmc_request_done(mmc, data->mrq);
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return;
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}
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host->stop_data = data;
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schedule_work(&host->send_stop_work);
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}
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static void
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mmc_omap_send_abort(struct mmc_omap_host *host, int maxloops)
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{
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struct mmc_omap_slot *slot = host->current_slot;
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unsigned int restarts, passes, timeout;
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u16 stat = 0;
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|
|
/* Sending abort takes 80 clocks. Have some extra and round up */
|
|
timeout = (120*1000000 + slot->fclk_freq - 1)/slot->fclk_freq;
|
|
restarts = 0;
|
|
while (restarts < maxloops) {
|
|
OMAP_MMC_WRITE(host, STAT, 0xFFFF);
|
|
OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7));
|
|
|
|
passes = 0;
|
|
while (passes < timeout) {
|
|
stat = OMAP_MMC_READ(host, STAT);
|
|
if (stat & OMAP_MMC_STAT_END_OF_CMD)
|
|
goto out;
|
|
udelay(1);
|
|
passes++;
|
|
}
|
|
|
|
restarts++;
|
|
}
|
|
out:
|
|
OMAP_MMC_WRITE(host, STAT, stat);
|
|
}
|
|
|
|
static void
|
|
mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data)
|
|
{
|
|
if (host->dma_in_use)
|
|
mmc_omap_release_dma(host, data, 1);
|
|
|
|
host->data = NULL;
|
|
host->sg_len = 0;
|
|
|
|
mmc_omap_send_abort(host, 10000);
|
|
}
|
|
|
|
static void
|
|
mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
|
|
{
|
|
unsigned long flags;
|
|
int done;
|
|
|
|
if (!host->dma_in_use) {
|
|
mmc_omap_xfer_done(host, data);
|
|
return;
|
|
}
|
|
done = 0;
|
|
spin_lock_irqsave(&host->dma_lock, flags);
|
|
if (host->dma_done)
|
|
done = 1;
|
|
else
|
|
host->brs_received = 1;
|
|
spin_unlock_irqrestore(&host->dma_lock, flags);
|
|
if (done)
|
|
mmc_omap_xfer_done(host, data);
|
|
}
|
|
|
|
static void
|
|
mmc_omap_dma_timer(unsigned long data)
|
|
{
|
|
struct mmc_omap_host *host = (struct mmc_omap_host *) data;
|
|
|
|
BUG_ON(host->dma_ch < 0);
|
|
omap_free_dma(host->dma_ch);
|
|
host->dma_ch = -1;
|
|
}
|
|
|
|
static void
|
|
mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
|
|
{
|
|
unsigned long flags;
|
|
int done;
|
|
|
|
done = 0;
|
|
spin_lock_irqsave(&host->dma_lock, flags);
|
|
if (host->brs_received)
|
|
done = 1;
|
|
else
|
|
host->dma_done = 1;
|
|
spin_unlock_irqrestore(&host->dma_lock, flags);
|
|
if (done)
|
|
mmc_omap_xfer_done(host, data);
|
|
}
|
|
|
|
static void
|
|
mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
|
|
{
|
|
host->cmd = NULL;
|
|
|
|
del_timer(&host->cmd_abort_timer);
|
|
|
|
if (cmd->flags & MMC_RSP_PRESENT) {
|
|
if (cmd->flags & MMC_RSP_136) {
|
|
/* response type 2 */
|
|
cmd->resp[3] =
|
|
OMAP_MMC_READ(host, RSP0) |
|
|
(OMAP_MMC_READ(host, RSP1) << 16);
|
|
cmd->resp[2] =
|
|
OMAP_MMC_READ(host, RSP2) |
|
|
(OMAP_MMC_READ(host, RSP3) << 16);
|
|
cmd->resp[1] =
|
|
OMAP_MMC_READ(host, RSP4) |
|
|
(OMAP_MMC_READ(host, RSP5) << 16);
|
|
cmd->resp[0] =
|
|
OMAP_MMC_READ(host, RSP6) |
|
|
(OMAP_MMC_READ(host, RSP7) << 16);
|
|
} else {
|
|
/* response types 1, 1b, 3, 4, 5, 6 */
|
|
cmd->resp[0] =
|
|
OMAP_MMC_READ(host, RSP6) |
|
|
(OMAP_MMC_READ(host, RSP7) << 16);
|
|
}
|
|
}
|
|
|
|
if (host->data == NULL || cmd->error) {
|
|
struct mmc_host *mmc;
|
|
|
|
if (host->data != NULL)
|
|
mmc_omap_abort_xfer(host, host->data);
|
|
host->mrq = NULL;
|
|
mmc = host->mmc;
|
|
mmc_omap_release_slot(host->current_slot, 1);
|
|
mmc_request_done(mmc, cmd->mrq);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Abort stuck command. Can occur when card is removed while it is being
|
|
* read.
|
|
*/
|
|
static void mmc_omap_abort_command(struct work_struct *work)
|
|
{
|
|
struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
|
|
cmd_abort_work);
|
|
BUG_ON(!host->cmd);
|
|
|
|
dev_dbg(mmc_dev(host->mmc), "Aborting stuck command CMD%d\n",
|
|
host->cmd->opcode);
|
|
|
|
if (host->cmd->error == 0)
|
|
host->cmd->error = -ETIMEDOUT;
|
|
|
|
if (host->data == NULL) {
|
|
struct mmc_command *cmd;
|
|
struct mmc_host *mmc;
|
|
|
|
cmd = host->cmd;
|
|
host->cmd = NULL;
|
|
mmc_omap_send_abort(host, 10000);
|
|
|
|
host->mrq = NULL;
|
|
mmc = host->mmc;
|
|
mmc_omap_release_slot(host->current_slot, 1);
|
|
mmc_request_done(mmc, cmd->mrq);
|
|
} else
|
|
mmc_omap_cmd_done(host, host->cmd);
|
|
|
|
host->abort = 0;
|
|
enable_irq(host->irq);
|
|
}
|
|
|
|
static void
|
|
mmc_omap_cmd_timer(unsigned long data)
|
|
{
|
|
struct mmc_omap_host *host = (struct mmc_omap_host *) data;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->slot_lock, flags);
|
|
if (host->cmd != NULL && !host->abort) {
|
|
OMAP_MMC_WRITE(host, IE, 0);
|
|
disable_irq(host->irq);
|
|
host->abort = 1;
|
|
schedule_work(&host->cmd_abort_work);
|
|
}
|
|
spin_unlock_irqrestore(&host->slot_lock, flags);
|
|
}
|
|
|
|
/* PIO only */
|
|
static void
|
|
mmc_omap_sg_to_buf(struct mmc_omap_host *host)
|
|
{
|
|
struct scatterlist *sg;
|
|
|
|
sg = host->data->sg + host->sg_idx;
|
|
host->buffer_bytes_left = sg->length;
|
|
host->buffer = sg_virt(sg);
|
|
if (host->buffer_bytes_left > host->total_bytes_left)
|
|
host->buffer_bytes_left = host->total_bytes_left;
|
|
}
|
|
|
|
static void
|
|
mmc_omap_clk_timer(unsigned long data)
|
|
{
|
|
struct mmc_omap_host *host = (struct mmc_omap_host *) data;
|
|
|
|
mmc_omap_fclk_enable(host, 0);
|
|
}
|
|
|
|
/* PIO only */
|
|
static void
|
|
mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
|
|
{
|
|
int n;
|
|
|
|
if (host->buffer_bytes_left == 0) {
|
|
host->sg_idx++;
|
|
BUG_ON(host->sg_idx == host->sg_len);
|
|
mmc_omap_sg_to_buf(host);
|
|
}
|
|
n = 64;
|
|
if (n > host->buffer_bytes_left)
|
|
n = host->buffer_bytes_left;
|
|
host->buffer_bytes_left -= n;
|
|
host->total_bytes_left -= n;
|
|
host->data->bytes_xfered += n;
|
|
|
|
if (write) {
|
|
__raw_writesw(host->virt_base + OMAP_MMC_REG_DATA, host->buffer, n);
|
|
} else {
|
|
__raw_readsw(host->virt_base + OMAP_MMC_REG_DATA, host->buffer, n);
|
|
}
|
|
}
|
|
|
|
static inline void mmc_omap_report_irq(u16 status)
|
|
{
|
|
static const char *mmc_omap_status_bits[] = {
|
|
"EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
|
|
"CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
|
|
};
|
|
int i, c = 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
|
|
if (status & (1 << i)) {
|
|
if (c)
|
|
printk(" ");
|
|
printk("%s", mmc_omap_status_bits[i]);
|
|
c++;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
|
|
{
|
|
struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
|
|
u16 status;
|
|
int end_command;
|
|
int end_transfer;
|
|
int transfer_error, cmd_error;
|
|
|
|
if (host->cmd == NULL && host->data == NULL) {
|
|
status = OMAP_MMC_READ(host, STAT);
|
|
dev_info(mmc_dev(host->slots[0]->mmc),
|
|
"Spurious IRQ 0x%04x\n", status);
|
|
if (status != 0) {
|
|
OMAP_MMC_WRITE(host, STAT, status);
|
|
OMAP_MMC_WRITE(host, IE, 0);
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
end_command = 0;
|
|
end_transfer = 0;
|
|
transfer_error = 0;
|
|
cmd_error = 0;
|
|
|
|
while ((status = OMAP_MMC_READ(host, STAT)) != 0) {
|
|
int cmd;
|
|
|
|
OMAP_MMC_WRITE(host, STAT, status);
|
|
if (host->cmd != NULL)
|
|
cmd = host->cmd->opcode;
|
|
else
|
|
cmd = -1;
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
|
|
status, cmd);
|
|
mmc_omap_report_irq(status);
|
|
printk("\n");
|
|
#endif
|
|
if (host->total_bytes_left) {
|
|
if ((status & OMAP_MMC_STAT_A_FULL) ||
|
|
(status & OMAP_MMC_STAT_END_OF_DATA))
|
|
mmc_omap_xfer_data(host, 0);
|
|
if (status & OMAP_MMC_STAT_A_EMPTY)
|
|
mmc_omap_xfer_data(host, 1);
|
|
}
|
|
|
|
if (status & OMAP_MMC_STAT_END_OF_DATA)
|
|
end_transfer = 1;
|
|
|
|
if (status & OMAP_MMC_STAT_DATA_TOUT) {
|
|
dev_dbg(mmc_dev(host->mmc), "data timeout (CMD%d)\n",
|
|
cmd);
|
|
if (host->data) {
|
|
host->data->error = -ETIMEDOUT;
|
|
transfer_error = 1;
|
|
}
|
|
}
|
|
|
|
if (status & OMAP_MMC_STAT_DATA_CRC) {
|
|
if (host->data) {
|
|
host->data->error = -EILSEQ;
|
|
dev_dbg(mmc_dev(host->mmc),
|
|
"data CRC error, bytes left %d\n",
|
|
host->total_bytes_left);
|
|
transfer_error = 1;
|
|
} else {
|
|
dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
|
|
}
|
|
}
|
|
|
|
if (status & OMAP_MMC_STAT_CMD_TOUT) {
|
|
/* Timeouts are routine with some commands */
|
|
if (host->cmd) {
|
|
struct mmc_omap_slot *slot =
|
|
host->current_slot;
|
|
if (slot == NULL ||
|
|
!mmc_omap_cover_is_open(slot))
|
|
dev_err(mmc_dev(host->mmc),
|
|
"command timeout (CMD%d)\n",
|
|
cmd);
|
|
host->cmd->error = -ETIMEDOUT;
|
|
end_command = 1;
|
|
cmd_error = 1;
|
|
}
|
|
}
|
|
|
|
if (status & OMAP_MMC_STAT_CMD_CRC) {
|
|
if (host->cmd) {
|
|
dev_err(mmc_dev(host->mmc),
|
|
"command CRC error (CMD%d, arg 0x%08x)\n",
|
|
cmd, host->cmd->arg);
|
|
host->cmd->error = -EILSEQ;
|
|
end_command = 1;
|
|
cmd_error = 1;
|
|
} else
|
|
dev_err(mmc_dev(host->mmc),
|
|
"command CRC error without cmd?\n");
|
|
}
|
|
|
|
if (status & OMAP_MMC_STAT_CARD_ERR) {
|
|
dev_dbg(mmc_dev(host->mmc),
|
|
"ignoring card status error (CMD%d)\n",
|
|
cmd);
|
|
end_command = 1;
|
|
}
|
|
|
|
/*
|
|
* NOTE: On 1610 the END_OF_CMD may come too early when
|
|
* starting a write
|
|
*/
|
|
if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
|
|
(!(status & OMAP_MMC_STAT_A_EMPTY))) {
|
|
end_command = 1;
|
|
}
|
|
}
|
|
|
|
if (cmd_error && host->data) {
|
|
del_timer(&host->cmd_abort_timer);
|
|
host->abort = 1;
|
|
OMAP_MMC_WRITE(host, IE, 0);
|
|
disable_irq_nosync(host->irq);
|
|
schedule_work(&host->cmd_abort_work);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
if (end_command)
|
|
mmc_omap_cmd_done(host, host->cmd);
|
|
if (host->data != NULL) {
|
|
if (transfer_error)
|
|
mmc_omap_xfer_done(host, host->data);
|
|
else if (end_transfer)
|
|
mmc_omap_end_of_data(host, host->data);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void omap_mmc_notify_cover_event(struct device *dev, int num, int is_closed)
|
|
{
|
|
int cover_open;
|
|
struct mmc_omap_host *host = dev_get_drvdata(dev);
|
|
struct mmc_omap_slot *slot = host->slots[num];
|
|
|
|
BUG_ON(num >= host->nr_slots);
|
|
|
|
/* Other subsystems can call in here before we're initialised. */
|
|
if (host->nr_slots == 0 || !host->slots[num])
|
|
return;
|
|
|
|
cover_open = mmc_omap_cover_is_open(slot);
|
|
if (cover_open != slot->cover_open) {
|
|
slot->cover_open = cover_open;
|
|
sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch");
|
|
}
|
|
|
|
tasklet_hi_schedule(&slot->cover_tasklet);
|
|
}
|
|
|
|
static void mmc_omap_cover_timer(unsigned long arg)
|
|
{
|
|
struct mmc_omap_slot *slot = (struct mmc_omap_slot *) arg;
|
|
tasklet_schedule(&slot->cover_tasklet);
|
|
}
|
|
|
|
static void mmc_omap_cover_handler(unsigned long param)
|
|
{
|
|
struct mmc_omap_slot *slot = (struct mmc_omap_slot *)param;
|
|
int cover_open = mmc_omap_cover_is_open(slot);
|
|
|
|
mmc_detect_change(slot->mmc, 0);
|
|
if (!cover_open)
|
|
return;
|
|
|
|
/*
|
|
* If no card is inserted, we postpone polling until
|
|
* the cover has been closed.
|
|
*/
|
|
if (slot->mmc->card == NULL || !mmc_card_present(slot->mmc->card))
|
|
return;
|
|
|
|
mod_timer(&slot->cover_timer,
|
|
jiffies + msecs_to_jiffies(OMAP_MMC_COVER_POLL_DELAY));
|
|
}
|
|
|
|
/* Prepare to transfer the next segment of a scatterlist */
|
|
static void
|
|
mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data)
|
|
{
|
|
int dma_ch = host->dma_ch;
|
|
unsigned long data_addr;
|
|
u16 buf, frame;
|
|
u32 count;
|
|
struct scatterlist *sg = &data->sg[host->sg_idx];
|
|
int src_port = 0;
|
|
int dst_port = 0;
|
|
int sync_dev = 0;
|
|
|
|
data_addr = host->phys_base + OMAP_MMC_REG_DATA;
|
|
frame = data->blksz;
|
|
count = sg_dma_len(sg);
|
|
|
|
if ((data->blocks == 1) && (count > data->blksz))
|
|
count = frame;
|
|
|
|
host->dma_len = count;
|
|
|
|
/* FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx and 24xx.
|
|
* Use 16 or 32 word frames when the blocksize is at least that large.
|
|
* Blocksize is usually 512 bytes; but not for some SD reads.
|
|
*/
|
|
if (cpu_is_omap15xx() && frame > 32)
|
|
frame = 32;
|
|
else if (frame > 64)
|
|
frame = 64;
|
|
count /= frame;
|
|
frame >>= 1;
|
|
|
|
if (!(data->flags & MMC_DATA_WRITE)) {
|
|
buf = 0x800f | ((frame - 1) << 8);
|
|
|
|
if (cpu_class_is_omap1()) {
|
|
src_port = OMAP_DMA_PORT_TIPB;
|
|
dst_port = OMAP_DMA_PORT_EMIFF;
|
|
}
|
|
if (cpu_is_omap24xx())
|
|
sync_dev = OMAP24XX_DMA_MMC1_RX;
|
|
|
|
omap_set_dma_src_params(dma_ch, src_port,
|
|
OMAP_DMA_AMODE_CONSTANT,
|
|
data_addr, 0, 0);
|
|
omap_set_dma_dest_params(dma_ch, dst_port,
|
|
OMAP_DMA_AMODE_POST_INC,
|
|
sg_dma_address(sg), 0, 0);
|
|
omap_set_dma_dest_data_pack(dma_ch, 1);
|
|
omap_set_dma_dest_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
|
|
} else {
|
|
buf = 0x0f80 | ((frame - 1) << 0);
|
|
|
|
if (cpu_class_is_omap1()) {
|
|
src_port = OMAP_DMA_PORT_EMIFF;
|
|
dst_port = OMAP_DMA_PORT_TIPB;
|
|
}
|
|
if (cpu_is_omap24xx())
|
|
sync_dev = OMAP24XX_DMA_MMC1_TX;
|
|
|
|
omap_set_dma_dest_params(dma_ch, dst_port,
|
|
OMAP_DMA_AMODE_CONSTANT,
|
|
data_addr, 0, 0);
|
|
omap_set_dma_src_params(dma_ch, src_port,
|
|
OMAP_DMA_AMODE_POST_INC,
|
|
sg_dma_address(sg), 0, 0);
|
|
omap_set_dma_src_data_pack(dma_ch, 1);
|
|
omap_set_dma_src_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
|
|
}
|
|
|
|
/* Max limit for DMA frame count is 0xffff */
|
|
BUG_ON(count > 0xffff);
|
|
|
|
OMAP_MMC_WRITE(host, BUF, buf);
|
|
omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S16,
|
|
frame, count, OMAP_DMA_SYNC_FRAME,
|
|
sync_dev, 0);
|
|
}
|
|
|
|
/* A scatterlist segment completed */
|
|
static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
|
|
{
|
|
struct mmc_omap_host *host = (struct mmc_omap_host *) data;
|
|
struct mmc_data *mmcdat = host->data;
|
|
|
|
if (unlikely(host->dma_ch < 0)) {
|
|
dev_err(mmc_dev(host->mmc),
|
|
"DMA callback while DMA not enabled\n");
|
|
return;
|
|
}
|
|
/* FIXME: We really should do something to _handle_ the errors */
|
|
if (ch_status & OMAP1_DMA_TOUT_IRQ) {
|
|
dev_err(mmc_dev(host->mmc),"DMA timeout\n");
|
|
return;
|
|
}
|
|
if (ch_status & OMAP_DMA_DROP_IRQ) {
|
|
dev_err(mmc_dev(host->mmc), "DMA sync error\n");
|
|
return;
|
|
}
|
|
if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
|
|
return;
|
|
}
|
|
mmcdat->bytes_xfered += host->dma_len;
|
|
host->sg_idx++;
|
|
if (host->sg_idx < host->sg_len) {
|
|
mmc_omap_prepare_dma(host, host->data);
|
|
omap_start_dma(host->dma_ch);
|
|
} else
|
|
mmc_omap_dma_done(host, host->data);
|
|
}
|
|
|
|
static int mmc_omap_get_dma_channel(struct mmc_omap_host *host, struct mmc_data *data)
|
|
{
|
|
const char *dma_dev_name;
|
|
int sync_dev, dma_ch, is_read, r;
|
|
|
|
is_read = !(data->flags & MMC_DATA_WRITE);
|
|
del_timer_sync(&host->dma_timer);
|
|
if (host->dma_ch >= 0) {
|
|
if (is_read == host->dma_is_read)
|
|
return 0;
|
|
omap_free_dma(host->dma_ch);
|
|
host->dma_ch = -1;
|
|
}
|
|
|
|
if (is_read) {
|
|
if (host->id == 0) {
|
|
sync_dev = OMAP_DMA_MMC_RX;
|
|
dma_dev_name = "MMC1 read";
|
|
} else {
|
|
sync_dev = OMAP_DMA_MMC2_RX;
|
|
dma_dev_name = "MMC2 read";
|
|
}
|
|
} else {
|
|
if (host->id == 0) {
|
|
sync_dev = OMAP_DMA_MMC_TX;
|
|
dma_dev_name = "MMC1 write";
|
|
} else {
|
|
sync_dev = OMAP_DMA_MMC2_TX;
|
|
dma_dev_name = "MMC2 write";
|
|
}
|
|
}
|
|
r = omap_request_dma(sync_dev, dma_dev_name, mmc_omap_dma_cb,
|
|
host, &dma_ch);
|
|
if (r != 0) {
|
|
dev_dbg(mmc_dev(host->mmc), "omap_request_dma() failed with %d\n", r);
|
|
return r;
|
|
}
|
|
host->dma_ch = dma_ch;
|
|
host->dma_is_read = is_read;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
|
|
{
|
|
u16 reg;
|
|
|
|
reg = OMAP_MMC_READ(host, SDIO);
|
|
reg &= ~(1 << 5);
|
|
OMAP_MMC_WRITE(host, SDIO, reg);
|
|
/* Set maximum timeout */
|
|
OMAP_MMC_WRITE(host, CTO, 0xff);
|
|
}
|
|
|
|
static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
|
|
{
|
|
unsigned int timeout, cycle_ns;
|
|
u16 reg;
|
|
|
|
cycle_ns = 1000000000 / host->current_slot->fclk_freq;
|
|
timeout = req->data->timeout_ns / cycle_ns;
|
|
timeout += req->data->timeout_clks;
|
|
|
|
/* Check if we need to use timeout multiplier register */
|
|
reg = OMAP_MMC_READ(host, SDIO);
|
|
if (timeout > 0xffff) {
|
|
reg |= (1 << 5);
|
|
timeout /= 1024;
|
|
} else
|
|
reg &= ~(1 << 5);
|
|
OMAP_MMC_WRITE(host, SDIO, reg);
|
|
OMAP_MMC_WRITE(host, DTO, timeout);
|
|
}
|
|
|
|
static void
|
|
mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
|
|
{
|
|
struct mmc_data *data = req->data;
|
|
int i, use_dma, block_size;
|
|
unsigned sg_len;
|
|
|
|
host->data = data;
|
|
if (data == NULL) {
|
|
OMAP_MMC_WRITE(host, BLEN, 0);
|
|
OMAP_MMC_WRITE(host, NBLK, 0);
|
|
OMAP_MMC_WRITE(host, BUF, 0);
|
|
host->dma_in_use = 0;
|
|
set_cmd_timeout(host, req);
|
|
return;
|
|
}
|
|
|
|
block_size = data->blksz;
|
|
|
|
OMAP_MMC_WRITE(host, NBLK, data->blocks - 1);
|
|
OMAP_MMC_WRITE(host, BLEN, block_size - 1);
|
|
set_data_timeout(host, req);
|
|
|
|
/* cope with calling layer confusion; it issues "single
|
|
* block" writes using multi-block scatterlists.
|
|
*/
|
|
sg_len = (data->blocks == 1) ? 1 : data->sg_len;
|
|
|
|
/* Only do DMA for entire blocks */
|
|
use_dma = host->use_dma;
|
|
if (use_dma) {
|
|
for (i = 0; i < sg_len; i++) {
|
|
if ((data->sg[i].length % block_size) != 0) {
|
|
use_dma = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
host->sg_idx = 0;
|
|
if (use_dma) {
|
|
if (mmc_omap_get_dma_channel(host, data) == 0) {
|
|
enum dma_data_direction dma_data_dir;
|
|
|
|
if (data->flags & MMC_DATA_WRITE)
|
|
dma_data_dir = DMA_TO_DEVICE;
|
|
else
|
|
dma_data_dir = DMA_FROM_DEVICE;
|
|
|
|
host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
|
|
sg_len, dma_data_dir);
|
|
host->total_bytes_left = 0;
|
|
mmc_omap_prepare_dma(host, req->data);
|
|
host->brs_received = 0;
|
|
host->dma_done = 0;
|
|
host->dma_in_use = 1;
|
|
} else
|
|
use_dma = 0;
|
|
}
|
|
|
|
/* Revert to PIO? */
|
|
if (!use_dma) {
|
|
OMAP_MMC_WRITE(host, BUF, 0x1f1f);
|
|
host->total_bytes_left = data->blocks * block_size;
|
|
host->sg_len = sg_len;
|
|
mmc_omap_sg_to_buf(host);
|
|
host->dma_in_use = 0;
|
|
}
|
|
}
|
|
|
|
static void mmc_omap_start_request(struct mmc_omap_host *host,
|
|
struct mmc_request *req)
|
|
{
|
|
BUG_ON(host->mrq != NULL);
|
|
|
|
host->mrq = req;
|
|
|
|
/* only touch fifo AFTER the controller readies it */
|
|
mmc_omap_prepare_data(host, req);
|
|
mmc_omap_start_command(host, req->cmd);
|
|
if (host->dma_in_use)
|
|
omap_start_dma(host->dma_ch);
|
|
BUG_ON(irqs_disabled());
|
|
}
|
|
|
|
static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
|
|
{
|
|
struct mmc_omap_slot *slot = mmc_priv(mmc);
|
|
struct mmc_omap_host *host = slot->host;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->slot_lock, flags);
|
|
if (host->mmc != NULL) {
|
|
BUG_ON(slot->mrq != NULL);
|
|
slot->mrq = req;
|
|
spin_unlock_irqrestore(&host->slot_lock, flags);
|
|
return;
|
|
} else
|
|
host->mmc = mmc;
|
|
spin_unlock_irqrestore(&host->slot_lock, flags);
|
|
mmc_omap_select_slot(slot, 1);
|
|
mmc_omap_start_request(host, req);
|
|
}
|
|
|
|
static void mmc_omap_set_power(struct mmc_omap_slot *slot, int power_on,
|
|
int vdd)
|
|
{
|
|
struct mmc_omap_host *host;
|
|
|
|
host = slot->host;
|
|
|
|
if (slot->pdata->set_power != NULL)
|
|
slot->pdata->set_power(mmc_dev(slot->mmc), slot->id, power_on,
|
|
vdd);
|
|
|
|
if (cpu_is_omap24xx()) {
|
|
u16 w;
|
|
|
|
if (power_on) {
|
|
w = OMAP_MMC_READ(host, CON);
|
|
OMAP_MMC_WRITE(host, CON, w | (1 << 11));
|
|
} else {
|
|
w = OMAP_MMC_READ(host, CON);
|
|
OMAP_MMC_WRITE(host, CON, w & ~(1 << 11));
|
|
}
|
|
}
|
|
}
|
|
|
|
static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct mmc_omap_slot *slot = mmc_priv(mmc);
|
|
struct mmc_omap_host *host = slot->host;
|
|
int func_clk_rate = clk_get_rate(host->fclk);
|
|
int dsor;
|
|
|
|
if (ios->clock == 0)
|
|
return 0;
|
|
|
|
dsor = func_clk_rate / ios->clock;
|
|
if (dsor < 1)
|
|
dsor = 1;
|
|
|
|
if (func_clk_rate / dsor > ios->clock)
|
|
dsor++;
|
|
|
|
if (dsor > 250)
|
|
dsor = 250;
|
|
|
|
slot->fclk_freq = func_clk_rate / dsor;
|
|
|
|
if (ios->bus_width == MMC_BUS_WIDTH_4)
|
|
dsor |= 1 << 15;
|
|
|
|
return dsor;
|
|
}
|
|
|
|
static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct mmc_omap_slot *slot = mmc_priv(mmc);
|
|
struct mmc_omap_host *host = slot->host;
|
|
int i, dsor;
|
|
int clk_enabled;
|
|
|
|
mmc_omap_select_slot(slot, 0);
|
|
|
|
dsor = mmc_omap_calc_divisor(mmc, ios);
|
|
|
|
if (ios->vdd != slot->vdd)
|
|
slot->vdd = ios->vdd;
|
|
|
|
clk_enabled = 0;
|
|
switch (ios->power_mode) {
|
|
case MMC_POWER_OFF:
|
|
mmc_omap_set_power(slot, 0, ios->vdd);
|
|
break;
|
|
case MMC_POWER_UP:
|
|
/* Cannot touch dsor yet, just power up MMC */
|
|
mmc_omap_set_power(slot, 1, ios->vdd);
|
|
goto exit;
|
|
case MMC_POWER_ON:
|
|
mmc_omap_fclk_enable(host, 1);
|
|
clk_enabled = 1;
|
|
dsor |= 1 << 11;
|
|
break;
|
|
}
|
|
|
|
if (slot->bus_mode != ios->bus_mode) {
|
|
if (slot->pdata->set_bus_mode != NULL)
|
|
slot->pdata->set_bus_mode(mmc_dev(mmc), slot->id,
|
|
ios->bus_mode);
|
|
slot->bus_mode = ios->bus_mode;
|
|
}
|
|
|
|
/* On insanely high arm_per frequencies something sometimes
|
|
* goes somehow out of sync, and the POW bit is not being set,
|
|
* which results in the while loop below getting stuck.
|
|
* Writing to the CON register twice seems to do the trick. */
|
|
for (i = 0; i < 2; i++)
|
|
OMAP_MMC_WRITE(host, CON, dsor);
|
|
slot->saved_con = dsor;
|
|
if (ios->power_mode == MMC_POWER_ON) {
|
|
/* worst case at 400kHz, 80 cycles makes 200 microsecs */
|
|
int usecs = 250;
|
|
|
|
/* Send clock cycles, poll completion */
|
|
OMAP_MMC_WRITE(host, IE, 0);
|
|
OMAP_MMC_WRITE(host, STAT, 0xffff);
|
|
OMAP_MMC_WRITE(host, CMD, 1 << 7);
|
|
while (usecs > 0 && (OMAP_MMC_READ(host, STAT) & 1) == 0) {
|
|
udelay(1);
|
|
usecs--;
|
|
}
|
|
OMAP_MMC_WRITE(host, STAT, 1);
|
|
}
|
|
|
|
exit:
|
|
mmc_omap_release_slot(slot, clk_enabled);
|
|
}
|
|
|
|
static const struct mmc_host_ops mmc_omap_ops = {
|
|
.request = mmc_omap_request,
|
|
.set_ios = mmc_omap_set_ios,
|
|
};
|
|
|
|
static int __init mmc_omap_new_slot(struct mmc_omap_host *host, int id)
|
|
{
|
|
struct mmc_omap_slot *slot = NULL;
|
|
struct mmc_host *mmc;
|
|
int r;
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct mmc_omap_slot), host->dev);
|
|
if (mmc == NULL)
|
|
return -ENOMEM;
|
|
|
|
slot = mmc_priv(mmc);
|
|
slot->host = host;
|
|
slot->mmc = mmc;
|
|
slot->id = id;
|
|
slot->pdata = &host->pdata->slots[id];
|
|
|
|
host->slots[id] = slot;
|
|
|
|
mmc->caps = 0;
|
|
if (host->pdata->slots[id].wires >= 4)
|
|
mmc->caps |= MMC_CAP_4_BIT_DATA;
|
|
|
|
mmc->ops = &mmc_omap_ops;
|
|
mmc->f_min = 400000;
|
|
|
|
if (cpu_class_is_omap2())
|
|
mmc->f_max = 48000000;
|
|
else
|
|
mmc->f_max = 24000000;
|
|
if (host->pdata->max_freq)
|
|
mmc->f_max = min(host->pdata->max_freq, mmc->f_max);
|
|
mmc->ocr_avail = slot->pdata->ocr_mask;
|
|
|
|
/* Use scatterlist DMA to reduce per-transfer costs.
|
|
* NOTE max_seg_size assumption that small blocks aren't
|
|
* normally used (except e.g. for reading SD registers).
|
|
*/
|
|
mmc->max_phys_segs = 32;
|
|
mmc->max_hw_segs = 32;
|
|
mmc->max_blk_size = 2048; /* BLEN is 11 bits (+1) */
|
|
mmc->max_blk_count = 2048; /* NBLK is 11 bits (+1) */
|
|
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
|
|
mmc->max_seg_size = mmc->max_req_size;
|
|
|
|
r = mmc_add_host(mmc);
|
|
if (r < 0)
|
|
goto err_remove_host;
|
|
|
|
if (slot->pdata->name != NULL) {
|
|
r = device_create_file(&mmc->class_dev,
|
|
&dev_attr_slot_name);
|
|
if (r < 0)
|
|
goto err_remove_host;
|
|
}
|
|
|
|
if (slot->pdata->get_cover_state != NULL) {
|
|
r = device_create_file(&mmc->class_dev,
|
|
&dev_attr_cover_switch);
|
|
if (r < 0)
|
|
goto err_remove_slot_name;
|
|
|
|
setup_timer(&slot->cover_timer, mmc_omap_cover_timer,
|
|
(unsigned long)slot);
|
|
tasklet_init(&slot->cover_tasklet, mmc_omap_cover_handler,
|
|
(unsigned long)slot);
|
|
tasklet_schedule(&slot->cover_tasklet);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_remove_slot_name:
|
|
if (slot->pdata->name != NULL)
|
|
device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
|
|
err_remove_host:
|
|
mmc_remove_host(mmc);
|
|
mmc_free_host(mmc);
|
|
return r;
|
|
}
|
|
|
|
static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
|
|
{
|
|
struct mmc_host *mmc = slot->mmc;
|
|
|
|
if (slot->pdata->name != NULL)
|
|
device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
|
|
if (slot->pdata->get_cover_state != NULL)
|
|
device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
|
|
|
|
tasklet_kill(&slot->cover_tasklet);
|
|
del_timer_sync(&slot->cover_timer);
|
|
flush_scheduled_work();
|
|
|
|
mmc_remove_host(mmc);
|
|
mmc_free_host(mmc);
|
|
}
|
|
|
|
static int __init mmc_omap_probe(struct platform_device *pdev)
|
|
{
|
|
struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
|
|
struct mmc_omap_host *host = NULL;
|
|
struct resource *res;
|
|
int i, ret = 0;
|
|
int irq;
|
|
|
|
if (pdata == NULL) {
|
|
dev_err(&pdev->dev, "platform data missing\n");
|
|
return -ENXIO;
|
|
}
|
|
if (pdata->nr_slots == 0) {
|
|
dev_err(&pdev->dev, "no slots\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (res == NULL || irq < 0)
|
|
return -ENXIO;
|
|
|
|
res = request_mem_region(res->start, res->end - res->start + 1,
|
|
pdev->name);
|
|
if (res == NULL)
|
|
return -EBUSY;
|
|
|
|
host = kzalloc(sizeof(struct mmc_omap_host), GFP_KERNEL);
|
|
if (host == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_free_mem_region;
|
|
}
|
|
|
|
INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work);
|
|
INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work);
|
|
|
|
INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command);
|
|
setup_timer(&host->cmd_abort_timer, mmc_omap_cmd_timer,
|
|
(unsigned long) host);
|
|
|
|
spin_lock_init(&host->clk_lock);
|
|
setup_timer(&host->clk_timer, mmc_omap_clk_timer, (unsigned long) host);
|
|
|
|
spin_lock_init(&host->dma_lock);
|
|
setup_timer(&host->dma_timer, mmc_omap_dma_timer, (unsigned long) host);
|
|
spin_lock_init(&host->slot_lock);
|
|
init_waitqueue_head(&host->slot_wq);
|
|
|
|
host->pdata = pdata;
|
|
host->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, host);
|
|
|
|
host->id = pdev->id;
|
|
host->mem_res = res;
|
|
host->irq = irq;
|
|
|
|
host->use_dma = 1;
|
|
host->dev->dma_mask = &pdata->dma_mask;
|
|
host->dma_ch = -1;
|
|
|
|
host->irq = irq;
|
|
host->phys_base = host->mem_res->start;
|
|
host->virt_base = ioremap(res->start, res->end - res->start + 1);
|
|
if (!host->virt_base)
|
|
goto err_ioremap;
|
|
|
|
host->iclk = clk_get(&pdev->dev, "ick");
|
|
if (IS_ERR(host->iclk))
|
|
goto err_free_mmc_host;
|
|
clk_enable(host->iclk);
|
|
|
|
host->fclk = clk_get(&pdev->dev, "fck");
|
|
if (IS_ERR(host->fclk)) {
|
|
ret = PTR_ERR(host->fclk);
|
|
goto err_free_iclk;
|
|
}
|
|
|
|
ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
|
|
if (ret)
|
|
goto err_free_fclk;
|
|
|
|
if (pdata->init != NULL) {
|
|
ret = pdata->init(&pdev->dev);
|
|
if (ret < 0)
|
|
goto err_free_irq;
|
|
}
|
|
|
|
host->nr_slots = pdata->nr_slots;
|
|
for (i = 0; i < pdata->nr_slots; i++) {
|
|
ret = mmc_omap_new_slot(host, i);
|
|
if (ret < 0) {
|
|
while (--i >= 0)
|
|
mmc_omap_remove_slot(host->slots[i]);
|
|
|
|
goto err_plat_cleanup;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_plat_cleanup:
|
|
if (pdata->cleanup)
|
|
pdata->cleanup(&pdev->dev);
|
|
err_free_irq:
|
|
free_irq(host->irq, host);
|
|
err_free_fclk:
|
|
clk_put(host->fclk);
|
|
err_free_iclk:
|
|
if (host->iclk != NULL) {
|
|
clk_disable(host->iclk);
|
|
clk_put(host->iclk);
|
|
}
|
|
err_free_mmc_host:
|
|
iounmap(host->virt_base);
|
|
err_ioremap:
|
|
kfree(host);
|
|
err_free_mem_region:
|
|
release_mem_region(res->start, res->end - res->start + 1);
|
|
return ret;
|
|
}
|
|
|
|
static int mmc_omap_remove(struct platform_device *pdev)
|
|
{
|
|
struct mmc_omap_host *host = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
BUG_ON(host == NULL);
|
|
|
|
for (i = 0; i < host->nr_slots; i++)
|
|
mmc_omap_remove_slot(host->slots[i]);
|
|
|
|
if (host->pdata->cleanup)
|
|
host->pdata->cleanup(&pdev->dev);
|
|
|
|
mmc_omap_fclk_enable(host, 0);
|
|
clk_put(host->fclk);
|
|
clk_disable(host->iclk);
|
|
clk_put(host->iclk);
|
|
|
|
iounmap(host->virt_base);
|
|
release_mem_region(pdev->resource[0].start,
|
|
pdev->resource[0].end - pdev->resource[0].start + 1);
|
|
|
|
kfree(host);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int mmc_omap_suspend(struct platform_device *pdev, pm_message_t mesg)
|
|
{
|
|
int i, ret = 0;
|
|
struct mmc_omap_host *host = platform_get_drvdata(pdev);
|
|
|
|
if (host == NULL || host->suspended)
|
|
return 0;
|
|
|
|
for (i = 0; i < host->nr_slots; i++) {
|
|
struct mmc_omap_slot *slot;
|
|
|
|
slot = host->slots[i];
|
|
ret = mmc_suspend_host(slot->mmc, mesg);
|
|
if (ret < 0) {
|
|
while (--i >= 0) {
|
|
slot = host->slots[i];
|
|
mmc_resume_host(slot->mmc);
|
|
}
|
|
return ret;
|
|
}
|
|
}
|
|
host->suspended = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_omap_resume(struct platform_device *pdev)
|
|
{
|
|
int i, ret = 0;
|
|
struct mmc_omap_host *host = platform_get_drvdata(pdev);
|
|
|
|
if (host == NULL || !host->suspended)
|
|
return 0;
|
|
|
|
for (i = 0; i < host->nr_slots; i++) {
|
|
struct mmc_omap_slot *slot;
|
|
slot = host->slots[i];
|
|
ret = mmc_resume_host(slot->mmc);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
host->suspended = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
#else
|
|
#define mmc_omap_suspend NULL
|
|
#define mmc_omap_resume NULL
|
|
#endif
|
|
|
|
static struct platform_driver mmc_omap_driver = {
|
|
.remove = mmc_omap_remove,
|
|
.suspend = mmc_omap_suspend,
|
|
.resume = mmc_omap_resume,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init mmc_omap_init(void)
|
|
{
|
|
return platform_driver_probe(&mmc_omap_driver, mmc_omap_probe);
|
|
}
|
|
|
|
static void __exit mmc_omap_exit(void)
|
|
{
|
|
platform_driver_unregister(&mmc_omap_driver);
|
|
}
|
|
|
|
module_init(mmc_omap_init);
|
|
module_exit(mmc_omap_exit);
|
|
|
|
MODULE_DESCRIPTION("OMAP Multimedia Card driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|
|
MODULE_AUTHOR("Juha Yrjölä");
|