![Bill Pemberton](/assets/img/avatar_default.png)
CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Manuel Lauss <manuel.lauss@gmail.com> Cc: Chris Ball <cjb@laptop.org> Cc: "Michał Mirosław" <mirq-linux@rere.qmqm.pl> Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com> Cc: Venkatraman S <svenkatr@ti.com> Cc: Viresh Kumar <viresh.linux@gmail.com> Cc: Ian Molton <ian@mnementh.co.uk> Cc: Bruce Chang <brucechang@via.com.tw> Cc: Harald Welte <HaraldWelte@viatech.com> Cc: Pierre Ossman <pierre@ossman.eu> Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1020 lines
24 KiB
C
1020 lines
24 KiB
C
/*
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* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 SD/MMC controller driver
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/mmc/host.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/scatterlist.h>
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#include <linux/clk.h>
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#include <linux/bitops.h>
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#include <linux/gpio.h>
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#include <asm/mach-jz4740/gpio.h>
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#include <asm/cacheflush.h>
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#include <linux/dma-mapping.h>
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#include <asm/mach-jz4740/jz4740_mmc.h>
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#define JZ_REG_MMC_STRPCL 0x00
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#define JZ_REG_MMC_STATUS 0x04
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#define JZ_REG_MMC_CLKRT 0x08
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#define JZ_REG_MMC_CMDAT 0x0C
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#define JZ_REG_MMC_RESTO 0x10
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#define JZ_REG_MMC_RDTO 0x14
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#define JZ_REG_MMC_BLKLEN 0x18
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#define JZ_REG_MMC_NOB 0x1C
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#define JZ_REG_MMC_SNOB 0x20
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#define JZ_REG_MMC_IMASK 0x24
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#define JZ_REG_MMC_IREG 0x28
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#define JZ_REG_MMC_CMD 0x2C
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#define JZ_REG_MMC_ARG 0x30
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#define JZ_REG_MMC_RESP_FIFO 0x34
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#define JZ_REG_MMC_RXFIFO 0x38
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#define JZ_REG_MMC_TXFIFO 0x3C
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#define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
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#define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
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#define JZ_MMC_STRPCL_START_READWAIT BIT(5)
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#define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
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#define JZ_MMC_STRPCL_RESET BIT(3)
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#define JZ_MMC_STRPCL_START_OP BIT(2)
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#define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
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#define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
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#define JZ_MMC_STRPCL_CLOCK_START BIT(1)
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#define JZ_MMC_STATUS_IS_RESETTING BIT(15)
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#define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
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#define JZ_MMC_STATUS_PRG_DONE BIT(13)
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#define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
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#define JZ_MMC_STATUS_END_CMD_RES BIT(11)
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#define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
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#define JZ_MMC_STATUS_IS_READWAIT BIT(9)
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#define JZ_MMC_STATUS_CLK_EN BIT(8)
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#define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
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#define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
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#define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
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#define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
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#define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
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#define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
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#define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
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#define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
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#define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
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#define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
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#define JZ_MMC_CMDAT_IO_ABORT BIT(11)
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#define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
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#define JZ_MMC_CMDAT_DMA_EN BIT(8)
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#define JZ_MMC_CMDAT_INIT BIT(7)
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#define JZ_MMC_CMDAT_BUSY BIT(6)
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#define JZ_MMC_CMDAT_STREAM BIT(5)
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#define JZ_MMC_CMDAT_WRITE BIT(4)
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#define JZ_MMC_CMDAT_DATA_EN BIT(3)
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#define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
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#define JZ_MMC_CMDAT_RSP_R1 1
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#define JZ_MMC_CMDAT_RSP_R2 2
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#define JZ_MMC_CMDAT_RSP_R3 3
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#define JZ_MMC_IRQ_SDIO BIT(7)
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#define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
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#define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
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#define JZ_MMC_IRQ_END_CMD_RES BIT(2)
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#define JZ_MMC_IRQ_PRG_DONE BIT(1)
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#define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
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#define JZ_MMC_CLK_RATE 24000000
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enum jz4740_mmc_state {
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JZ4740_MMC_STATE_READ_RESPONSE,
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JZ4740_MMC_STATE_TRANSFER_DATA,
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JZ4740_MMC_STATE_SEND_STOP,
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JZ4740_MMC_STATE_DONE,
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};
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struct jz4740_mmc_host {
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struct mmc_host *mmc;
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struct platform_device *pdev;
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struct jz4740_mmc_platform_data *pdata;
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struct clk *clk;
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int irq;
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int card_detect_irq;
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struct resource *mem;
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void __iomem *base;
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struct mmc_request *req;
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struct mmc_command *cmd;
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unsigned long waiting;
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uint32_t cmdat;
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uint16_t irq_mask;
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spinlock_t lock;
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struct timer_list timeout_timer;
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struct sg_mapping_iter miter;
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enum jz4740_mmc_state state;
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};
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static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
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unsigned int irq, bool enabled)
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{
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unsigned long flags;
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spin_lock_irqsave(&host->lock, flags);
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if (enabled)
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host->irq_mask &= ~irq;
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else
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host->irq_mask |= irq;
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spin_unlock_irqrestore(&host->lock, flags);
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writew(host->irq_mask, host->base + JZ_REG_MMC_IMASK);
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}
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static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
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bool start_transfer)
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{
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uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
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if (start_transfer)
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val |= JZ_MMC_STRPCL_START_OP;
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writew(val, host->base + JZ_REG_MMC_STRPCL);
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}
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static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
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{
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uint32_t status;
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unsigned int timeout = 1000;
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writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
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do {
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status = readl(host->base + JZ_REG_MMC_STATUS);
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} while (status & JZ_MMC_STATUS_CLK_EN && --timeout);
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}
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static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
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{
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uint32_t status;
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unsigned int timeout = 1000;
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writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
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udelay(10);
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do {
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status = readl(host->base + JZ_REG_MMC_STATUS);
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} while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout);
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}
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static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
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{
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struct mmc_request *req;
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req = host->req;
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host->req = NULL;
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mmc_request_done(host->mmc, req);
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}
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static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
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unsigned int irq)
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{
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unsigned int timeout = 0x800;
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uint16_t status;
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do {
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status = readw(host->base + JZ_REG_MMC_IREG);
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} while (!(status & irq) && --timeout);
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if (timeout == 0) {
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set_bit(0, &host->waiting);
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mod_timer(&host->timeout_timer, jiffies + 5*HZ);
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jz4740_mmc_set_irq_enabled(host, irq, true);
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return true;
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}
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return false;
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}
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static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
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struct mmc_data *data)
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{
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int status;
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status = readl(host->base + JZ_REG_MMC_STATUS);
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if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
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if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
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host->req->cmd->error = -ETIMEDOUT;
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data->error = -ETIMEDOUT;
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} else {
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host->req->cmd->error = -EIO;
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data->error = -EIO;
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}
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}
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}
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static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
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struct mmc_data *data)
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{
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struct sg_mapping_iter *miter = &host->miter;
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void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
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uint32_t *buf;
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bool timeout;
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size_t i, j;
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while (sg_miter_next(miter)) {
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buf = miter->addr;
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i = miter->length / 4;
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j = i / 8;
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i = i & 0x7;
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while (j) {
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timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
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if (unlikely(timeout))
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goto poll_timeout;
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writel(buf[0], fifo_addr);
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writel(buf[1], fifo_addr);
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writel(buf[2], fifo_addr);
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writel(buf[3], fifo_addr);
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writel(buf[4], fifo_addr);
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writel(buf[5], fifo_addr);
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writel(buf[6], fifo_addr);
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writel(buf[7], fifo_addr);
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buf += 8;
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--j;
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}
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if (unlikely(i)) {
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timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
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if (unlikely(timeout))
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goto poll_timeout;
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while (i) {
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writel(*buf, fifo_addr);
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++buf;
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--i;
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}
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}
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data->bytes_xfered += miter->length;
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}
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sg_miter_stop(miter);
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return false;
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poll_timeout:
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miter->consumed = (void *)buf - miter->addr;
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data->bytes_xfered += miter->consumed;
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sg_miter_stop(miter);
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return true;
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}
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static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
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struct mmc_data *data)
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{
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struct sg_mapping_iter *miter = &host->miter;
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void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
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uint32_t *buf;
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uint32_t d;
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uint16_t status;
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size_t i, j;
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unsigned int timeout;
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while (sg_miter_next(miter)) {
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buf = miter->addr;
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i = miter->length;
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j = i / 32;
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i = i & 0x1f;
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while (j) {
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timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
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if (unlikely(timeout))
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goto poll_timeout;
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buf[0] = readl(fifo_addr);
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buf[1] = readl(fifo_addr);
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buf[2] = readl(fifo_addr);
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buf[3] = readl(fifo_addr);
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buf[4] = readl(fifo_addr);
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buf[5] = readl(fifo_addr);
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buf[6] = readl(fifo_addr);
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buf[7] = readl(fifo_addr);
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buf += 8;
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--j;
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}
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if (unlikely(i)) {
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timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
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if (unlikely(timeout))
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goto poll_timeout;
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while (i >= 4) {
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*buf++ = readl(fifo_addr);
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i -= 4;
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}
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if (unlikely(i > 0)) {
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d = readl(fifo_addr);
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memcpy(buf, &d, i);
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}
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}
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data->bytes_xfered += miter->length;
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/* This can go away once MIPS implements
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* flush_kernel_dcache_page */
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flush_dcache_page(miter->page);
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}
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sg_miter_stop(miter);
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/* For whatever reason there is sometime one word more in the fifo then
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* requested */
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timeout = 1000;
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status = readl(host->base + JZ_REG_MMC_STATUS);
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while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
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d = readl(fifo_addr);
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status = readl(host->base + JZ_REG_MMC_STATUS);
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}
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return false;
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poll_timeout:
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miter->consumed = (void *)buf - miter->addr;
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data->bytes_xfered += miter->consumed;
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sg_miter_stop(miter);
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return true;
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}
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static void jz4740_mmc_timeout(unsigned long data)
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{
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struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)data;
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if (!test_and_clear_bit(0, &host->waiting))
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return;
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jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
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host->req->cmd->error = -ETIMEDOUT;
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jz4740_mmc_request_done(host);
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}
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static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
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struct mmc_command *cmd)
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{
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int i;
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uint16_t tmp;
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void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
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if (cmd->flags & MMC_RSP_136) {
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tmp = readw(fifo_addr);
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for (i = 0; i < 4; ++i) {
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cmd->resp[i] = tmp << 24;
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tmp = readw(fifo_addr);
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cmd->resp[i] |= tmp << 8;
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tmp = readw(fifo_addr);
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cmd->resp[i] |= tmp >> 8;
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}
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} else {
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cmd->resp[0] = readw(fifo_addr) << 24;
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cmd->resp[0] |= readw(fifo_addr) << 8;
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cmd->resp[0] |= readw(fifo_addr) & 0xff;
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}
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}
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static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
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struct mmc_command *cmd)
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{
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uint32_t cmdat = host->cmdat;
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host->cmdat &= ~JZ_MMC_CMDAT_INIT;
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jz4740_mmc_clock_disable(host);
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host->cmd = cmd;
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if (cmd->flags & MMC_RSP_BUSY)
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cmdat |= JZ_MMC_CMDAT_BUSY;
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switch (mmc_resp_type(cmd)) {
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case MMC_RSP_R1B:
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case MMC_RSP_R1:
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cmdat |= JZ_MMC_CMDAT_RSP_R1;
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break;
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case MMC_RSP_R2:
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cmdat |= JZ_MMC_CMDAT_RSP_R2;
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break;
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case MMC_RSP_R3:
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cmdat |= JZ_MMC_CMDAT_RSP_R3;
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break;
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default:
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break;
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}
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if (cmd->data) {
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cmdat |= JZ_MMC_CMDAT_DATA_EN;
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if (cmd->data->flags & MMC_DATA_WRITE)
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cmdat |= JZ_MMC_CMDAT_WRITE;
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if (cmd->data->flags & MMC_DATA_STREAM)
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cmdat |= JZ_MMC_CMDAT_STREAM;
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writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
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writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
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}
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writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
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writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
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writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
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jz4740_mmc_clock_enable(host, 1);
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}
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static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
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{
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struct mmc_command *cmd = host->req->cmd;
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struct mmc_data *data = cmd->data;
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int direction;
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if (data->flags & MMC_DATA_READ)
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direction = SG_MITER_TO_SG;
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else
|
|
direction = SG_MITER_FROM_SG;
|
|
|
|
sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
|
|
}
|
|
|
|
|
|
static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
|
|
{
|
|
struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
|
|
struct mmc_command *cmd = host->req->cmd;
|
|
struct mmc_request *req = host->req;
|
|
bool timeout = false;
|
|
|
|
if (cmd->error)
|
|
host->state = JZ4740_MMC_STATE_DONE;
|
|
|
|
switch (host->state) {
|
|
case JZ4740_MMC_STATE_READ_RESPONSE:
|
|
if (cmd->flags & MMC_RSP_PRESENT)
|
|
jz4740_mmc_read_response(host, cmd);
|
|
|
|
if (!cmd->data)
|
|
break;
|
|
|
|
jz_mmc_prepare_data_transfer(host);
|
|
|
|
case JZ4740_MMC_STATE_TRANSFER_DATA:
|
|
if (cmd->data->flags & MMC_DATA_READ)
|
|
timeout = jz4740_mmc_read_data(host, cmd->data);
|
|
else
|
|
timeout = jz4740_mmc_write_data(host, cmd->data);
|
|
|
|
if (unlikely(timeout)) {
|
|
host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
|
|
break;
|
|
}
|
|
|
|
jz4740_mmc_transfer_check_state(host, cmd->data);
|
|
|
|
timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
|
|
if (unlikely(timeout)) {
|
|
host->state = JZ4740_MMC_STATE_SEND_STOP;
|
|
break;
|
|
}
|
|
writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG);
|
|
|
|
case JZ4740_MMC_STATE_SEND_STOP:
|
|
if (!req->stop)
|
|
break;
|
|
|
|
jz4740_mmc_send_command(host, req->stop);
|
|
|
|
timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_PRG_DONE);
|
|
if (timeout) {
|
|
host->state = JZ4740_MMC_STATE_DONE;
|
|
break;
|
|
}
|
|
case JZ4740_MMC_STATE_DONE:
|
|
break;
|
|
}
|
|
|
|
if (!timeout)
|
|
jz4740_mmc_request_done(host);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t jz_mmc_irq(int irq, void *devid)
|
|
{
|
|
struct jz4740_mmc_host *host = devid;
|
|
struct mmc_command *cmd = host->cmd;
|
|
uint16_t irq_reg, status, tmp;
|
|
|
|
irq_reg = readw(host->base + JZ_REG_MMC_IREG);
|
|
|
|
tmp = irq_reg;
|
|
irq_reg &= ~host->irq_mask;
|
|
|
|
tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
|
|
JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
|
|
|
|
if (tmp != irq_reg)
|
|
writew(tmp & ~irq_reg, host->base + JZ_REG_MMC_IREG);
|
|
|
|
if (irq_reg & JZ_MMC_IRQ_SDIO) {
|
|
writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG);
|
|
mmc_signal_sdio_irq(host->mmc);
|
|
irq_reg &= ~JZ_MMC_IRQ_SDIO;
|
|
}
|
|
|
|
if (host->req && cmd && irq_reg) {
|
|
if (test_and_clear_bit(0, &host->waiting)) {
|
|
del_timer(&host->timeout_timer);
|
|
|
|
status = readl(host->base + JZ_REG_MMC_STATUS);
|
|
|
|
if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
|
|
cmd->error = -ETIMEDOUT;
|
|
} else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
|
|
cmd->error = -EIO;
|
|
} else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
|
|
JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
|
|
if (cmd->data)
|
|
cmd->data->error = -EIO;
|
|
cmd->error = -EIO;
|
|
} else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
|
|
JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
|
|
if (cmd->data)
|
|
cmd->data->error = -EIO;
|
|
cmd->error = -EIO;
|
|
}
|
|
|
|
jz4740_mmc_set_irq_enabled(host, irq_reg, false);
|
|
writew(irq_reg, host->base + JZ_REG_MMC_IREG);
|
|
|
|
return IRQ_WAKE_THREAD;
|
|
}
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
|
|
{
|
|
int div = 0;
|
|
int real_rate;
|
|
|
|
jz4740_mmc_clock_disable(host);
|
|
clk_set_rate(host->clk, JZ_MMC_CLK_RATE);
|
|
|
|
real_rate = clk_get_rate(host->clk);
|
|
|
|
while (real_rate > rate && div < 7) {
|
|
++div;
|
|
real_rate >>= 1;
|
|
}
|
|
|
|
writew(div, host->base + JZ_REG_MMC_CLKRT);
|
|
return real_rate;
|
|
}
|
|
|
|
static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
|
|
{
|
|
struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
|
|
host->req = req;
|
|
|
|
writew(0xffff, host->base + JZ_REG_MMC_IREG);
|
|
|
|
writew(JZ_MMC_IRQ_END_CMD_RES, host->base + JZ_REG_MMC_IREG);
|
|
jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
|
|
|
|
host->state = JZ4740_MMC_STATE_READ_RESPONSE;
|
|
set_bit(0, &host->waiting);
|
|
mod_timer(&host->timeout_timer, jiffies + 5*HZ);
|
|
jz4740_mmc_send_command(host, req->cmd);
|
|
}
|
|
|
|
static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
if (ios->clock)
|
|
jz4740_mmc_set_clock_rate(host, ios->clock);
|
|
|
|
switch (ios->power_mode) {
|
|
case MMC_POWER_UP:
|
|
jz4740_mmc_reset(host);
|
|
if (gpio_is_valid(host->pdata->gpio_power))
|
|
gpio_set_value(host->pdata->gpio_power,
|
|
!host->pdata->power_active_low);
|
|
host->cmdat |= JZ_MMC_CMDAT_INIT;
|
|
clk_enable(host->clk);
|
|
break;
|
|
case MMC_POWER_ON:
|
|
break;
|
|
default:
|
|
if (gpio_is_valid(host->pdata->gpio_power))
|
|
gpio_set_value(host->pdata->gpio_power,
|
|
host->pdata->power_active_low);
|
|
clk_disable(host->clk);
|
|
break;
|
|
}
|
|
|
|
switch (ios->bus_width) {
|
|
case MMC_BUS_WIDTH_1:
|
|
host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
|
|
break;
|
|
case MMC_BUS_WIDTH_4:
|
|
host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int jz4740_mmc_get_ro(struct mmc_host *mmc)
|
|
{
|
|
struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
if (!gpio_is_valid(host->pdata->gpio_read_only))
|
|
return -ENOSYS;
|
|
|
|
return gpio_get_value(host->pdata->gpio_read_only) ^
|
|
host->pdata->read_only_active_low;
|
|
}
|
|
|
|
static int jz4740_mmc_get_cd(struct mmc_host *mmc)
|
|
{
|
|
struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
if (!gpio_is_valid(host->pdata->gpio_card_detect))
|
|
return -ENOSYS;
|
|
|
|
return gpio_get_value(host->pdata->gpio_card_detect) ^
|
|
host->pdata->card_detect_active_low;
|
|
}
|
|
|
|
static irqreturn_t jz4740_mmc_card_detect_irq(int irq, void *devid)
|
|
{
|
|
struct jz4740_mmc_host *host = devid;
|
|
|
|
mmc_detect_change(host->mmc, HZ / 2);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
|
|
{
|
|
struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
|
|
}
|
|
|
|
static const struct mmc_host_ops jz4740_mmc_ops = {
|
|
.request = jz4740_mmc_request,
|
|
.set_ios = jz4740_mmc_set_ios,
|
|
.get_ro = jz4740_mmc_get_ro,
|
|
.get_cd = jz4740_mmc_get_cd,
|
|
.enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
|
|
};
|
|
|
|
static const struct jz_gpio_bulk_request jz4740_mmc_pins[] = {
|
|
JZ_GPIO_BULK_PIN(MSC_CMD),
|
|
JZ_GPIO_BULK_PIN(MSC_CLK),
|
|
JZ_GPIO_BULK_PIN(MSC_DATA0),
|
|
JZ_GPIO_BULK_PIN(MSC_DATA1),
|
|
JZ_GPIO_BULK_PIN(MSC_DATA2),
|
|
JZ_GPIO_BULK_PIN(MSC_DATA3),
|
|
};
|
|
|
|
static int jz4740_mmc_request_gpio(struct device *dev, int gpio,
|
|
const char *name, bool output, int value)
|
|
{
|
|
int ret;
|
|
|
|
if (!gpio_is_valid(gpio))
|
|
return 0;
|
|
|
|
ret = gpio_request(gpio, name);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to request %s gpio: %d\n", name, ret);
|
|
return ret;
|
|
}
|
|
|
|
if (output)
|
|
gpio_direction_output(gpio, value);
|
|
else
|
|
gpio_direction_input(gpio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int jz4740_mmc_request_gpios(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
|
|
|
|
if (!pdata)
|
|
return 0;
|
|
|
|
ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_card_detect,
|
|
"MMC detect change", false, 0);
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_read_only,
|
|
"MMC read only", false, 0);
|
|
if (ret)
|
|
goto err_free_gpio_card_detect;
|
|
|
|
ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_power,
|
|
"MMC read only", true, pdata->power_active_low);
|
|
if (ret)
|
|
goto err_free_gpio_read_only;
|
|
|
|
return 0;
|
|
|
|
err_free_gpio_read_only:
|
|
if (gpio_is_valid(pdata->gpio_read_only))
|
|
gpio_free(pdata->gpio_read_only);
|
|
err_free_gpio_card_detect:
|
|
if (gpio_is_valid(pdata->gpio_card_detect))
|
|
gpio_free(pdata->gpio_card_detect);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static int jz4740_mmc_request_cd_irq(struct platform_device *pdev,
|
|
struct jz4740_mmc_host *host)
|
|
{
|
|
struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
|
|
|
|
if (!gpio_is_valid(pdata->gpio_card_detect))
|
|
return 0;
|
|
|
|
host->card_detect_irq = gpio_to_irq(pdata->gpio_card_detect);
|
|
if (host->card_detect_irq < 0) {
|
|
dev_warn(&pdev->dev, "Failed to get card detect irq\n");
|
|
return 0;
|
|
}
|
|
|
|
return request_irq(host->card_detect_irq, jz4740_mmc_card_detect_irq,
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
|
"MMC card detect", host);
|
|
}
|
|
|
|
static void jz4740_mmc_free_gpios(struct platform_device *pdev)
|
|
{
|
|
struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
|
|
|
|
if (!pdata)
|
|
return;
|
|
|
|
if (gpio_is_valid(pdata->gpio_power))
|
|
gpio_free(pdata->gpio_power);
|
|
if (gpio_is_valid(pdata->gpio_read_only))
|
|
gpio_free(pdata->gpio_read_only);
|
|
if (gpio_is_valid(pdata->gpio_card_detect))
|
|
gpio_free(pdata->gpio_card_detect);
|
|
}
|
|
|
|
static inline size_t jz4740_mmc_num_pins(struct jz4740_mmc_host *host)
|
|
{
|
|
size_t num_pins = ARRAY_SIZE(jz4740_mmc_pins);
|
|
if (host->pdata && host->pdata->data_1bit)
|
|
num_pins -= 3;
|
|
|
|
return num_pins;
|
|
}
|
|
|
|
static int jz4740_mmc_probe(struct platform_device* pdev)
|
|
{
|
|
int ret;
|
|
struct mmc_host *mmc;
|
|
struct jz4740_mmc_host *host;
|
|
struct jz4740_mmc_platform_data *pdata;
|
|
|
|
pdata = pdev->dev.platform_data;
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
|
|
if (!mmc) {
|
|
dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
host = mmc_priv(mmc);
|
|
host->pdata = pdata;
|
|
|
|
host->irq = platform_get_irq(pdev, 0);
|
|
if (host->irq < 0) {
|
|
ret = host->irq;
|
|
dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
|
|
goto err_free_host;
|
|
}
|
|
|
|
host->clk = clk_get(&pdev->dev, "mmc");
|
|
if (IS_ERR(host->clk)) {
|
|
ret = PTR_ERR(host->clk);
|
|
dev_err(&pdev->dev, "Failed to get mmc clock\n");
|
|
goto err_free_host;
|
|
}
|
|
|
|
host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!host->mem) {
|
|
ret = -ENOENT;
|
|
dev_err(&pdev->dev, "Failed to get base platform memory\n");
|
|
goto err_clk_put;
|
|
}
|
|
|
|
host->mem = request_mem_region(host->mem->start,
|
|
resource_size(host->mem), pdev->name);
|
|
if (!host->mem) {
|
|
ret = -EBUSY;
|
|
dev_err(&pdev->dev, "Failed to request base memory region\n");
|
|
goto err_clk_put;
|
|
}
|
|
|
|
host->base = ioremap_nocache(host->mem->start, resource_size(host->mem));
|
|
if (!host->base) {
|
|
ret = -EBUSY;
|
|
dev_err(&pdev->dev, "Failed to ioremap base memory\n");
|
|
goto err_release_mem_region;
|
|
}
|
|
|
|
ret = jz_gpio_bulk_request(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to request mmc pins: %d\n", ret);
|
|
goto err_iounmap;
|
|
}
|
|
|
|
ret = jz4740_mmc_request_gpios(pdev);
|
|
if (ret)
|
|
goto err_gpio_bulk_free;
|
|
|
|
mmc->ops = &jz4740_mmc_ops;
|
|
mmc->f_min = JZ_MMC_CLK_RATE / 128;
|
|
mmc->f_max = JZ_MMC_CLK_RATE;
|
|
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
|
|
mmc->caps = (pdata && pdata->data_1bit) ? 0 : MMC_CAP_4_BIT_DATA;
|
|
mmc->caps |= MMC_CAP_SDIO_IRQ;
|
|
|
|
mmc->max_blk_size = (1 << 10) - 1;
|
|
mmc->max_blk_count = (1 << 15) - 1;
|
|
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
|
|
|
|
mmc->max_segs = 128;
|
|
mmc->max_seg_size = mmc->max_req_size;
|
|
|
|
host->mmc = mmc;
|
|
host->pdev = pdev;
|
|
spin_lock_init(&host->lock);
|
|
host->irq_mask = 0xffff;
|
|
|
|
ret = jz4740_mmc_request_cd_irq(pdev, host);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to request card detect irq\n");
|
|
goto err_free_gpios;
|
|
}
|
|
|
|
ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
|
|
dev_name(&pdev->dev), host);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
|
|
goto err_free_card_detect_irq;
|
|
}
|
|
|
|
jz4740_mmc_reset(host);
|
|
jz4740_mmc_clock_disable(host);
|
|
setup_timer(&host->timeout_timer, jz4740_mmc_timeout,
|
|
(unsigned long)host);
|
|
/* It is not important when it times out, it just needs to timeout. */
|
|
set_timer_slack(&host->timeout_timer, HZ);
|
|
|
|
platform_set_drvdata(pdev, host);
|
|
ret = mmc_add_host(mmc);
|
|
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
|
|
goto err_free_irq;
|
|
}
|
|
dev_info(&pdev->dev, "JZ SD/MMC card driver registered\n");
|
|
|
|
return 0;
|
|
|
|
err_free_irq:
|
|
free_irq(host->irq, host);
|
|
err_free_card_detect_irq:
|
|
if (host->card_detect_irq >= 0)
|
|
free_irq(host->card_detect_irq, host);
|
|
err_free_gpios:
|
|
jz4740_mmc_free_gpios(pdev);
|
|
err_gpio_bulk_free:
|
|
jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
err_iounmap:
|
|
iounmap(host->base);
|
|
err_release_mem_region:
|
|
release_mem_region(host->mem->start, resource_size(host->mem));
|
|
err_clk_put:
|
|
clk_put(host->clk);
|
|
err_free_host:
|
|
platform_set_drvdata(pdev, NULL);
|
|
mmc_free_host(mmc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int jz4740_mmc_remove(struct platform_device *pdev)
|
|
{
|
|
struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
|
|
|
|
del_timer_sync(&host->timeout_timer);
|
|
jz4740_mmc_set_irq_enabled(host, 0xff, false);
|
|
jz4740_mmc_reset(host);
|
|
|
|
mmc_remove_host(host->mmc);
|
|
|
|
free_irq(host->irq, host);
|
|
if (host->card_detect_irq >= 0)
|
|
free_irq(host->card_detect_irq, host);
|
|
|
|
jz4740_mmc_free_gpios(pdev);
|
|
jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
|
|
iounmap(host->base);
|
|
release_mem_region(host->mem->start, resource_size(host->mem));
|
|
|
|
clk_put(host->clk);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
mmc_free_host(host->mmc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int jz4740_mmc_suspend(struct device *dev)
|
|
{
|
|
struct jz4740_mmc_host *host = dev_get_drvdata(dev);
|
|
|
|
mmc_suspend_host(host->mmc);
|
|
|
|
jz_gpio_bulk_suspend(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int jz4740_mmc_resume(struct device *dev)
|
|
{
|
|
struct jz4740_mmc_host *host = dev_get_drvdata(dev);
|
|
|
|
jz_gpio_bulk_resume(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
|
|
mmc_resume_host(host->mmc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct dev_pm_ops jz4740_mmc_pm_ops = {
|
|
.suspend = jz4740_mmc_suspend,
|
|
.resume = jz4740_mmc_resume,
|
|
.poweroff = jz4740_mmc_suspend,
|
|
.restore = jz4740_mmc_resume,
|
|
};
|
|
|
|
#define JZ4740_MMC_PM_OPS (&jz4740_mmc_pm_ops)
|
|
#else
|
|
#define JZ4740_MMC_PM_OPS NULL
|
|
#endif
|
|
|
|
static struct platform_driver jz4740_mmc_driver = {
|
|
.probe = jz4740_mmc_probe,
|
|
.remove = jz4740_mmc_remove,
|
|
.driver = {
|
|
.name = "jz4740-mmc",
|
|
.owner = THIS_MODULE,
|
|
.pm = JZ4740_MMC_PM_OPS,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(jz4740_mmc_driver);
|
|
|
|
MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|