![Ben Dooks](/assets/img/avatar_default.png)
Add better support for omitting either the card detect or the write protect GPIOs if the board does not support it. Add the fields no_wprotect and no_detect to the platform data which when set indicate the absence of the respective GPIOs. Note, this also fixes a minor bug where it tries to free IRQ0 if there is no detect gpio available. Signed-off-by: Ben Dooks <ben@simtec.co.uk> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1934 lines
46 KiB
C
1934 lines
46 KiB
C
/*
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* linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
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*
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* Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
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*
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* Current driver maintained by Ben Dooks and Simtec Electronics
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* Copyright (C) 2008 Simtec Electronics <ben-linux@fluff.org>
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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/dma-mapping.h>
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#include <linux/clk.h>
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#include <linux/mmc/host.h>
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#include <linux/platform_device.h>
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#include <linux/cpufreq.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <mach/dma.h>
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#include <mach/regs-sdi.h>
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#include <mach/regs-gpio.h>
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#include <plat/mci.h>
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#include "s3cmci.h"
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#define DRIVER_NAME "s3c-mci"
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enum dbg_channels {
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dbg_err = (1 << 0),
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dbg_debug = (1 << 1),
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dbg_info = (1 << 2),
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dbg_irq = (1 << 3),
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dbg_sg = (1 << 4),
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dbg_dma = (1 << 5),
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dbg_pio = (1 << 6),
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dbg_fail = (1 << 7),
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dbg_conf = (1 << 8),
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};
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static const int dbgmap_err = dbg_fail;
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static const int dbgmap_info = dbg_info | dbg_conf;
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static const int dbgmap_debug = dbg_err | dbg_debug;
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#define dbg(host, channels, args...) \
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do { \
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if (dbgmap_err & channels) \
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dev_err(&host->pdev->dev, args); \
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else if (dbgmap_info & channels) \
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dev_info(&host->pdev->dev, args); \
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else if (dbgmap_debug & channels) \
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dev_dbg(&host->pdev->dev, args); \
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} while (0)
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static struct s3c2410_dma_client s3cmci_dma_client = {
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.name = "s3c-mci",
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};
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static void finalize_request(struct s3cmci_host *host);
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static void s3cmci_send_request(struct mmc_host *mmc);
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static void s3cmci_reset(struct s3cmci_host *host);
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#ifdef CONFIG_MMC_DEBUG
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static void dbg_dumpregs(struct s3cmci_host *host, char *prefix)
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{
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u32 con, pre, cmdarg, cmdcon, cmdsta, r0, r1, r2, r3, timer, bsize;
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u32 datcon, datcnt, datsta, fsta, imask;
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con = readl(host->base + S3C2410_SDICON);
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pre = readl(host->base + S3C2410_SDIPRE);
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cmdarg = readl(host->base + S3C2410_SDICMDARG);
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cmdcon = readl(host->base + S3C2410_SDICMDCON);
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cmdsta = readl(host->base + S3C2410_SDICMDSTAT);
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r0 = readl(host->base + S3C2410_SDIRSP0);
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r1 = readl(host->base + S3C2410_SDIRSP1);
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r2 = readl(host->base + S3C2410_SDIRSP2);
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r3 = readl(host->base + S3C2410_SDIRSP3);
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timer = readl(host->base + S3C2410_SDITIMER);
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bsize = readl(host->base + S3C2410_SDIBSIZE);
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datcon = readl(host->base + S3C2410_SDIDCON);
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datcnt = readl(host->base + S3C2410_SDIDCNT);
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datsta = readl(host->base + S3C2410_SDIDSTA);
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fsta = readl(host->base + S3C2410_SDIFSTA);
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imask = readl(host->base + host->sdiimsk);
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dbg(host, dbg_debug, "%s CON:[%08x] PRE:[%08x] TMR:[%08x]\n",
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prefix, con, pre, timer);
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dbg(host, dbg_debug, "%s CCON:[%08x] CARG:[%08x] CSTA:[%08x]\n",
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prefix, cmdcon, cmdarg, cmdsta);
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dbg(host, dbg_debug, "%s DCON:[%08x] FSTA:[%08x]"
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" DSTA:[%08x] DCNT:[%08x]\n",
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prefix, datcon, fsta, datsta, datcnt);
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dbg(host, dbg_debug, "%s R0:[%08x] R1:[%08x]"
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" R2:[%08x] R3:[%08x]\n",
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prefix, r0, r1, r2, r3);
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}
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static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
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int stop)
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{
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snprintf(host->dbgmsg_cmd, 300,
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"#%u%s op:%i arg:0x%08x flags:0x08%x retries:%u",
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host->ccnt, (stop ? " (STOP)" : ""),
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cmd->opcode, cmd->arg, cmd->flags, cmd->retries);
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if (cmd->data) {
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snprintf(host->dbgmsg_dat, 300,
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"#%u bsize:%u blocks:%u bytes:%u",
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host->dcnt, cmd->data->blksz,
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cmd->data->blocks,
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cmd->data->blocks * cmd->data->blksz);
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} else {
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host->dbgmsg_dat[0] = '\0';
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}
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}
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static void dbg_dumpcmd(struct s3cmci_host *host, struct mmc_command *cmd,
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int fail)
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{
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unsigned int dbglvl = fail ? dbg_fail : dbg_debug;
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if (!cmd)
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return;
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if (cmd->error == 0) {
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dbg(host, dbglvl, "CMD[OK] %s R0:0x%08x\n",
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host->dbgmsg_cmd, cmd->resp[0]);
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} else {
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dbg(host, dbglvl, "CMD[ERR %i] %s Status:%s\n",
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cmd->error, host->dbgmsg_cmd, host->status);
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}
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if (!cmd->data)
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return;
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if (cmd->data->error == 0) {
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dbg(host, dbglvl, "DAT[OK] %s\n", host->dbgmsg_dat);
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} else {
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dbg(host, dbglvl, "DAT[ERR %i] %s DCNT:0x%08x\n",
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cmd->data->error, host->dbgmsg_dat,
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readl(host->base + S3C2410_SDIDCNT));
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}
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}
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#else
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static void dbg_dumpcmd(struct s3cmci_host *host,
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struct mmc_command *cmd, int fail) { }
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static void prepare_dbgmsg(struct s3cmci_host *host, struct mmc_command *cmd,
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int stop) { }
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static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
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#endif /* CONFIG_MMC_DEBUG */
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/**
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* s3cmci_host_usedma - return whether the host is using dma or pio
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* @host: The host state
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*
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* Return true if the host is using DMA to transfer data, else false
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* to use PIO mode. Will return static data depending on the driver
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* configuration.
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*/
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static inline bool s3cmci_host_usedma(struct s3cmci_host *host)
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{
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#ifdef CONFIG_MMC_S3C_PIO
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return false;
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#elif defined(CONFIG_MMC_S3C_DMA)
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return true;
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#else
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return host->dodma;
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#endif
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}
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/**
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* s3cmci_host_canpio - return true if host has pio code available
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*
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* Return true if the driver has been compiled with the PIO support code
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* available.
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*/
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static inline bool s3cmci_host_canpio(void)
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{
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#ifdef CONFIG_MMC_S3C_PIO
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return true;
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#else
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return false;
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#endif
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}
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static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
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{
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u32 newmask;
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newmask = readl(host->base + host->sdiimsk);
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newmask |= imask;
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writel(newmask, host->base + host->sdiimsk);
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return newmask;
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}
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static inline u32 disable_imask(struct s3cmci_host *host, u32 imask)
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{
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u32 newmask;
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newmask = readl(host->base + host->sdiimsk);
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newmask &= ~imask;
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writel(newmask, host->base + host->sdiimsk);
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return newmask;
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}
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static inline void clear_imask(struct s3cmci_host *host)
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{
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u32 mask = readl(host->base + host->sdiimsk);
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/* preserve the SDIO IRQ mask state */
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mask &= S3C2410_SDIIMSK_SDIOIRQ;
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writel(mask, host->base + host->sdiimsk);
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}
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/**
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* s3cmci_check_sdio_irq - test whether the SDIO IRQ is being signalled
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* @host: The host to check.
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*
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* Test to see if the SDIO interrupt is being signalled in case the
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* controller has failed to re-detect a card interrupt. Read GPE8 and
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* see if it is low and if so, signal a SDIO interrupt.
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*
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* This is currently called if a request is finished (we assume that the
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* bus is now idle) and when the SDIO IRQ is enabled in case the IRQ is
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* already being indicated.
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*/
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static void s3cmci_check_sdio_irq(struct s3cmci_host *host)
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{
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if (host->sdio_irqen) {
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if (gpio_get_value(S3C2410_GPE(8)) == 0) {
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printk(KERN_DEBUG "%s: signalling irq\n", __func__);
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mmc_signal_sdio_irq(host->mmc);
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}
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}
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}
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static inline int get_data_buffer(struct s3cmci_host *host,
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u32 *bytes, u32 **pointer)
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{
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struct scatterlist *sg;
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if (host->pio_active == XFER_NONE)
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return -EINVAL;
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if ((!host->mrq) || (!host->mrq->data))
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return -EINVAL;
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if (host->pio_sgptr >= host->mrq->data->sg_len) {
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dbg(host, dbg_debug, "no more buffers (%i/%i)\n",
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host->pio_sgptr, host->mrq->data->sg_len);
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return -EBUSY;
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}
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sg = &host->mrq->data->sg[host->pio_sgptr];
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*bytes = sg->length;
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*pointer = sg_virt(sg);
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host->pio_sgptr++;
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dbg(host, dbg_sg, "new buffer (%i/%i)\n",
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host->pio_sgptr, host->mrq->data->sg_len);
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return 0;
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}
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static inline u32 fifo_count(struct s3cmci_host *host)
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{
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u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
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fifostat &= S3C2410_SDIFSTA_COUNTMASK;
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return fifostat;
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}
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static inline u32 fifo_free(struct s3cmci_host *host)
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{
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u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
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fifostat &= S3C2410_SDIFSTA_COUNTMASK;
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return 63 - fifostat;
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}
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/**
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* s3cmci_enable_irq - enable IRQ, after having disabled it.
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* @host: The device state.
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* @more: True if more IRQs are expected from transfer.
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*
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* Enable the main IRQ if needed after it has been disabled.
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*
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* The IRQ can be one of the following states:
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* - disabled during IDLE
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* - disabled whilst processing data
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* - enabled during transfer
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* - enabled whilst awaiting SDIO interrupt detection
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*/
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static void s3cmci_enable_irq(struct s3cmci_host *host, bool more)
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{
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unsigned long flags;
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bool enable = false;
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local_irq_save(flags);
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host->irq_enabled = more;
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host->irq_disabled = false;
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enable = more | host->sdio_irqen;
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if (host->irq_state != enable) {
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host->irq_state = enable;
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if (enable)
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enable_irq(host->irq);
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else
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disable_irq(host->irq);
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}
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local_irq_restore(flags);
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}
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/**
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*
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*/
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static void s3cmci_disable_irq(struct s3cmci_host *host, bool transfer)
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{
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unsigned long flags;
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local_irq_save(flags);
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//printk(KERN_DEBUG "%s: transfer %d\n", __func__, transfer);
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host->irq_disabled = transfer;
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if (transfer && host->irq_state) {
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host->irq_state = false;
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disable_irq(host->irq);
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}
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local_irq_restore(flags);
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}
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static void do_pio_read(struct s3cmci_host *host)
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{
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int res;
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u32 fifo;
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u32 *ptr;
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u32 fifo_words;
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void __iomem *from_ptr;
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/* write real prescaler to host, it might be set slow to fix */
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writel(host->prescaler, host->base + S3C2410_SDIPRE);
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from_ptr = host->base + host->sdidata;
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while ((fifo = fifo_count(host))) {
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if (!host->pio_bytes) {
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res = get_data_buffer(host, &host->pio_bytes,
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&host->pio_ptr);
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if (res) {
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host->pio_active = XFER_NONE;
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host->complete_what = COMPLETION_FINALIZE;
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dbg(host, dbg_pio, "pio_read(): "
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"complete (no more data).\n");
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return;
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}
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dbg(host, dbg_pio,
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"pio_read(): new target: [%i]@[%p]\n",
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host->pio_bytes, host->pio_ptr);
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}
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dbg(host, dbg_pio,
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"pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
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fifo, host->pio_bytes,
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readl(host->base + S3C2410_SDIDCNT));
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/* If we have reached the end of the block, we can
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* read a word and get 1 to 3 bytes. If we in the
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* middle of the block, we have to read full words,
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* otherwise we will write garbage, so round down to
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* an even multiple of 4. */
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if (fifo >= host->pio_bytes)
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fifo = host->pio_bytes;
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else
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fifo -= fifo & 3;
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host->pio_bytes -= fifo;
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host->pio_count += fifo;
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fifo_words = fifo >> 2;
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ptr = host->pio_ptr;
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while (fifo_words--)
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*ptr++ = readl(from_ptr);
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host->pio_ptr = ptr;
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if (fifo & 3) {
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u32 n = fifo & 3;
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u32 data = readl(from_ptr);
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u8 *p = (u8 *)host->pio_ptr;
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while (n--) {
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*p++ = data;
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data >>= 8;
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}
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}
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}
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if (!host->pio_bytes) {
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res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
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if (res) {
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dbg(host, dbg_pio,
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"pio_read(): complete (no more buffers).\n");
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host->pio_active = XFER_NONE;
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host->complete_what = COMPLETION_FINALIZE;
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return;
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}
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}
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enable_imask(host,
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S3C2410_SDIIMSK_RXFIFOHALF | S3C2410_SDIIMSK_RXFIFOLAST);
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}
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static void do_pio_write(struct s3cmci_host *host)
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{
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void __iomem *to_ptr;
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int res;
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u32 fifo;
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u32 *ptr;
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to_ptr = host->base + host->sdidata;
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while ((fifo = fifo_free(host)) > 3) {
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if (!host->pio_bytes) {
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res = get_data_buffer(host, &host->pio_bytes,
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&host->pio_ptr);
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if (res) {
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dbg(host, dbg_pio,
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"pio_write(): complete (no more data).\n");
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host->pio_active = XFER_NONE;
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return;
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}
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dbg(host, dbg_pio,
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"pio_write(): new source: [%i]@[%p]\n",
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host->pio_bytes, host->pio_ptr);
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}
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/* If we have reached the end of the block, we have to
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* write exactly the remaining number of bytes. If we
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* in the middle of the block, we have to write full
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* words, so round down to an even multiple of 4. */
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if (fifo >= host->pio_bytes)
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fifo = host->pio_bytes;
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else
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fifo -= fifo & 3;
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host->pio_bytes -= fifo;
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host->pio_count += fifo;
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fifo = (fifo + 3) >> 2;
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ptr = host->pio_ptr;
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while (fifo--)
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writel(*ptr++, to_ptr);
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host->pio_ptr = ptr;
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}
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enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
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}
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static void pio_tasklet(unsigned long data)
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{
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struct s3cmci_host *host = (struct s3cmci_host *) data;
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s3cmci_disable_irq(host, true);
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|
|
if (host->pio_active == XFER_WRITE)
|
|
do_pio_write(host);
|
|
|
|
if (host->pio_active == XFER_READ)
|
|
do_pio_read(host);
|
|
|
|
if (host->complete_what == COMPLETION_FINALIZE) {
|
|
clear_imask(host);
|
|
if (host->pio_active != XFER_NONE) {
|
|
dbg(host, dbg_err, "unfinished %s "
|
|
"- pio_count:[%u] pio_bytes:[%u]\n",
|
|
(host->pio_active == XFER_READ) ? "read" : "write",
|
|
host->pio_count, host->pio_bytes);
|
|
|
|
if (host->mrq->data)
|
|
host->mrq->data->error = -EINVAL;
|
|
}
|
|
|
|
s3cmci_enable_irq(host, false);
|
|
finalize_request(host);
|
|
} else
|
|
s3cmci_enable_irq(host, true);
|
|
}
|
|
|
|
/*
|
|
* ISR for SDI Interface IRQ
|
|
* Communication between driver and ISR works as follows:
|
|
* host->mrq points to current request
|
|
* host->complete_what Indicates when the request is considered done
|
|
* COMPLETION_CMDSENT when the command was sent
|
|
* COMPLETION_RSPFIN when a response was received
|
|
* COMPLETION_XFERFINISH when the data transfer is finished
|
|
* COMPLETION_XFERFINISH_RSPFIN both of the above.
|
|
* host->complete_request is the completion-object the driver waits for
|
|
*
|
|
* 1) Driver sets up host->mrq and host->complete_what
|
|
* 2) Driver prepares the transfer
|
|
* 3) Driver enables interrupts
|
|
* 4) Driver starts transfer
|
|
* 5) Driver waits for host->complete_rquest
|
|
* 6) ISR checks for request status (errors and success)
|
|
* 6) ISR sets host->mrq->cmd->error and host->mrq->data->error
|
|
* 7) ISR completes host->complete_request
|
|
* 8) ISR disables interrupts
|
|
* 9) Driver wakes up and takes care of the request
|
|
*
|
|
* Note: "->error"-fields are expected to be set to 0 before the request
|
|
* was issued by mmc.c - therefore they are only set, when an error
|
|
* contition comes up
|
|
*/
|
|
|
|
static irqreturn_t s3cmci_irq(int irq, void *dev_id)
|
|
{
|
|
struct s3cmci_host *host = dev_id;
|
|
struct mmc_command *cmd;
|
|
u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
|
|
u32 mci_cclear = 0, mci_dclear;
|
|
unsigned long iflags;
|
|
|
|
mci_dsta = readl(host->base + S3C2410_SDIDSTA);
|
|
mci_imsk = readl(host->base + host->sdiimsk);
|
|
|
|
if (mci_dsta & S3C2410_SDIDSTA_SDIOIRQDETECT) {
|
|
if (mci_imsk & S3C2410_SDIIMSK_SDIOIRQ) {
|
|
mci_dclear = S3C2410_SDIDSTA_SDIOIRQDETECT;
|
|
writel(mci_dclear, host->base + S3C2410_SDIDSTA);
|
|
|
|
mmc_signal_sdio_irq(host->mmc);
|
|
return IRQ_HANDLED;
|
|
}
|
|
}
|
|
|
|
spin_lock_irqsave(&host->complete_lock, iflags);
|
|
|
|
mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
|
|
mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
|
|
mci_fsta = readl(host->base + S3C2410_SDIFSTA);
|
|
mci_dclear = 0;
|
|
|
|
if ((host->complete_what == COMPLETION_NONE) ||
|
|
(host->complete_what == COMPLETION_FINALIZE)) {
|
|
host->status = "nothing to complete";
|
|
clear_imask(host);
|
|
goto irq_out;
|
|
}
|
|
|
|
if (!host->mrq) {
|
|
host->status = "no active mrq";
|
|
clear_imask(host);
|
|
goto irq_out;
|
|
}
|
|
|
|
cmd = host->cmd_is_stop ? host->mrq->stop : host->mrq->cmd;
|
|
|
|
if (!cmd) {
|
|
host->status = "no active cmd";
|
|
clear_imask(host);
|
|
goto irq_out;
|
|
}
|
|
|
|
if (!s3cmci_host_usedma(host)) {
|
|
if ((host->pio_active == XFER_WRITE) &&
|
|
(mci_fsta & S3C2410_SDIFSTA_TFDET)) {
|
|
|
|
disable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
|
|
tasklet_schedule(&host->pio_tasklet);
|
|
host->status = "pio tx";
|
|
}
|
|
|
|
if ((host->pio_active == XFER_READ) &&
|
|
(mci_fsta & S3C2410_SDIFSTA_RFDET)) {
|
|
|
|
disable_imask(host,
|
|
S3C2410_SDIIMSK_RXFIFOHALF |
|
|
S3C2410_SDIIMSK_RXFIFOLAST);
|
|
|
|
tasklet_schedule(&host->pio_tasklet);
|
|
host->status = "pio rx";
|
|
}
|
|
}
|
|
|
|
if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
|
|
dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
|
|
cmd->error = -ETIMEDOUT;
|
|
host->status = "error: command timeout";
|
|
goto fail_transfer;
|
|
}
|
|
|
|
if (mci_csta & S3C2410_SDICMDSTAT_CMDSENT) {
|
|
if (host->complete_what == COMPLETION_CMDSENT) {
|
|
host->status = "ok: command sent";
|
|
goto close_transfer;
|
|
}
|
|
|
|
mci_cclear |= S3C2410_SDICMDSTAT_CMDSENT;
|
|
}
|
|
|
|
if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
|
|
if (cmd->flags & MMC_RSP_CRC) {
|
|
if (host->mrq->cmd->flags & MMC_RSP_136) {
|
|
dbg(host, dbg_irq,
|
|
"fixup: ignore CRC fail with long rsp\n");
|
|
} else {
|
|
/* note, we used to fail the transfer
|
|
* here, but it seems that this is just
|
|
* the hardware getting it wrong.
|
|
*
|
|
* cmd->error = -EILSEQ;
|
|
* host->status = "error: bad command crc";
|
|
* goto fail_transfer;
|
|
*/
|
|
}
|
|
}
|
|
|
|
mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;
|
|
}
|
|
|
|
if (mci_csta & S3C2410_SDICMDSTAT_RSPFIN) {
|
|
if (host->complete_what == COMPLETION_RSPFIN) {
|
|
host->status = "ok: command response received";
|
|
goto close_transfer;
|
|
}
|
|
|
|
if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
|
|
host->complete_what = COMPLETION_XFERFINISH;
|
|
|
|
mci_cclear |= S3C2410_SDICMDSTAT_RSPFIN;
|
|
}
|
|
|
|
/* errors handled after this point are only relevant
|
|
when a data transfer is in progress */
|
|
|
|
if (!cmd->data)
|
|
goto clear_status_bits;
|
|
|
|
/* Check for FIFO failure */
|
|
if (host->is2440) {
|
|
if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
|
|
dbg(host, dbg_err, "FIFO failure\n");
|
|
host->mrq->data->error = -EILSEQ;
|
|
host->status = "error: 2440 fifo failure";
|
|
goto fail_transfer;
|
|
}
|
|
} else {
|
|
if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
|
|
dbg(host, dbg_err, "FIFO failure\n");
|
|
cmd->data->error = -EILSEQ;
|
|
host->status = "error: fifo failure";
|
|
goto fail_transfer;
|
|
}
|
|
}
|
|
|
|
if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
|
|
dbg(host, dbg_err, "bad data crc (outgoing)\n");
|
|
cmd->data->error = -EILSEQ;
|
|
host->status = "error: bad data crc (outgoing)";
|
|
goto fail_transfer;
|
|
}
|
|
|
|
if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
|
|
dbg(host, dbg_err, "bad data crc (incoming)\n");
|
|
cmd->data->error = -EILSEQ;
|
|
host->status = "error: bad data crc (incoming)";
|
|
goto fail_transfer;
|
|
}
|
|
|
|
if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
|
|
dbg(host, dbg_err, "data timeout\n");
|
|
cmd->data->error = -ETIMEDOUT;
|
|
host->status = "error: data timeout";
|
|
goto fail_transfer;
|
|
}
|
|
|
|
if (mci_dsta & S3C2410_SDIDSTA_XFERFINISH) {
|
|
if (host->complete_what == COMPLETION_XFERFINISH) {
|
|
host->status = "ok: data transfer completed";
|
|
goto close_transfer;
|
|
}
|
|
|
|
if (host->complete_what == COMPLETION_XFERFINISH_RSPFIN)
|
|
host->complete_what = COMPLETION_RSPFIN;
|
|
|
|
mci_dclear |= S3C2410_SDIDSTA_XFERFINISH;
|
|
}
|
|
|
|
clear_status_bits:
|
|
writel(mci_cclear, host->base + S3C2410_SDICMDSTAT);
|
|
writel(mci_dclear, host->base + S3C2410_SDIDSTA);
|
|
|
|
goto irq_out;
|
|
|
|
fail_transfer:
|
|
host->pio_active = XFER_NONE;
|
|
|
|
close_transfer:
|
|
host->complete_what = COMPLETION_FINALIZE;
|
|
|
|
clear_imask(host);
|
|
tasklet_schedule(&host->pio_tasklet);
|
|
|
|
goto irq_out;
|
|
|
|
irq_out:
|
|
dbg(host, dbg_irq,
|
|
"csta:0x%08x dsta:0x%08x fsta:0x%08x dcnt:0x%08x status:%s.\n",
|
|
mci_csta, mci_dsta, mci_fsta, mci_dcnt, host->status);
|
|
|
|
spin_unlock_irqrestore(&host->complete_lock, iflags);
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
/*
|
|
* ISR for the CardDetect Pin
|
|
*/
|
|
|
|
static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
|
|
{
|
|
struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
|
|
|
|
dbg(host, dbg_irq, "card detect\n");
|
|
|
|
mmc_detect_change(host->mmc, msecs_to_jiffies(500));
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void s3cmci_dma_done_callback(struct s3c2410_dma_chan *dma_ch,
|
|
void *buf_id, int size,
|
|
enum s3c2410_dma_buffresult result)
|
|
{
|
|
struct s3cmci_host *host = buf_id;
|
|
unsigned long iflags;
|
|
u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt;
|
|
|
|
mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
|
|
mci_dsta = readl(host->base + S3C2410_SDIDSTA);
|
|
mci_fsta = readl(host->base + S3C2410_SDIFSTA);
|
|
mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
|
|
|
|
BUG_ON(!host->mrq);
|
|
BUG_ON(!host->mrq->data);
|
|
BUG_ON(!host->dmatogo);
|
|
|
|
spin_lock_irqsave(&host->complete_lock, iflags);
|
|
|
|
if (result != S3C2410_RES_OK) {
|
|
dbg(host, dbg_fail, "DMA FAILED: csta=0x%08x dsta=0x%08x "
|
|
"fsta=0x%08x dcnt:0x%08x result:0x%08x toGo:%u\n",
|
|
mci_csta, mci_dsta, mci_fsta,
|
|
mci_dcnt, result, host->dmatogo);
|
|
|
|
goto fail_request;
|
|
}
|
|
|
|
host->dmatogo--;
|
|
if (host->dmatogo) {
|
|
dbg(host, dbg_dma, "DMA DONE Size:%i DSTA:[%08x] "
|
|
"DCNT:[%08x] toGo:%u\n",
|
|
size, mci_dsta, mci_dcnt, host->dmatogo);
|
|
|
|
goto out;
|
|
}
|
|
|
|
dbg(host, dbg_dma, "DMA FINISHED Size:%i DSTA:%08x DCNT:%08x\n",
|
|
size, mci_dsta, mci_dcnt);
|
|
|
|
host->dma_complete = 1;
|
|
host->complete_what = COMPLETION_FINALIZE;
|
|
|
|
out:
|
|
tasklet_schedule(&host->pio_tasklet);
|
|
spin_unlock_irqrestore(&host->complete_lock, iflags);
|
|
return;
|
|
|
|
fail_request:
|
|
host->mrq->data->error = -EINVAL;
|
|
host->complete_what = COMPLETION_FINALIZE;
|
|
clear_imask(host);
|
|
|
|
goto out;
|
|
}
|
|
|
|
static void finalize_request(struct s3cmci_host *host)
|
|
{
|
|
struct mmc_request *mrq = host->mrq;
|
|
struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
|
|
int debug_as_failure = 0;
|
|
|
|
if (host->complete_what != COMPLETION_FINALIZE)
|
|
return;
|
|
|
|
if (!mrq)
|
|
return;
|
|
|
|
if (cmd->data && (cmd->error == 0) &&
|
|
(cmd->data->error == 0)) {
|
|
if (s3cmci_host_usedma(host) && (!host->dma_complete)) {
|
|
dbg(host, dbg_dma, "DMA Missing (%d)!\n",
|
|
host->dma_complete);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Read response from controller. */
|
|
cmd->resp[0] = readl(host->base + S3C2410_SDIRSP0);
|
|
cmd->resp[1] = readl(host->base + S3C2410_SDIRSP1);
|
|
cmd->resp[2] = readl(host->base + S3C2410_SDIRSP2);
|
|
cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3);
|
|
|
|
writel(host->prescaler, host->base + S3C2410_SDIPRE);
|
|
|
|
if (cmd->error)
|
|
debug_as_failure = 1;
|
|
|
|
if (cmd->data && cmd->data->error)
|
|
debug_as_failure = 1;
|
|
|
|
dbg_dumpcmd(host, cmd, debug_as_failure);
|
|
|
|
/* Cleanup controller */
|
|
writel(0, host->base + S3C2410_SDICMDARG);
|
|
writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
|
|
writel(0, host->base + S3C2410_SDICMDCON);
|
|
clear_imask(host);
|
|
|
|
if (cmd->data && cmd->error)
|
|
cmd->data->error = cmd->error;
|
|
|
|
if (cmd->data && cmd->data->stop && (!host->cmd_is_stop)) {
|
|
host->cmd_is_stop = 1;
|
|
s3cmci_send_request(host->mmc);
|
|
return;
|
|
}
|
|
|
|
/* If we have no data transfer we are finished here */
|
|
if (!mrq->data)
|
|
goto request_done;
|
|
|
|
/* Calulate the amout of bytes transfer if there was no error */
|
|
if (mrq->data->error == 0) {
|
|
mrq->data->bytes_xfered =
|
|
(mrq->data->blocks * mrq->data->blksz);
|
|
} else {
|
|
mrq->data->bytes_xfered = 0;
|
|
}
|
|
|
|
/* If we had an error while transfering data we flush the
|
|
* DMA channel and the fifo to clear out any garbage. */
|
|
if (mrq->data->error != 0) {
|
|
if (s3cmci_host_usedma(host))
|
|
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
|
|
|
|
if (host->is2440) {
|
|
/* Clear failure register and reset fifo. */
|
|
writel(S3C2440_SDIFSTA_FIFORESET |
|
|
S3C2440_SDIFSTA_FIFOFAIL,
|
|
host->base + S3C2410_SDIFSTA);
|
|
} else {
|
|
u32 mci_con;
|
|
|
|
/* reset fifo */
|
|
mci_con = readl(host->base + S3C2410_SDICON);
|
|
mci_con |= S3C2410_SDICON_FIFORESET;
|
|
|
|
writel(mci_con, host->base + S3C2410_SDICON);
|
|
}
|
|
}
|
|
|
|
request_done:
|
|
host->complete_what = COMPLETION_NONE;
|
|
host->mrq = NULL;
|
|
|
|
s3cmci_check_sdio_irq(host);
|
|
mmc_request_done(host->mmc, mrq);
|
|
}
|
|
|
|
static void s3cmci_dma_setup(struct s3cmci_host *host,
|
|
enum s3c2410_dmasrc source)
|
|
{
|
|
static enum s3c2410_dmasrc last_source = -1;
|
|
static int setup_ok;
|
|
|
|
if (last_source == source)
|
|
return;
|
|
|
|
last_source = source;
|
|
|
|
s3c2410_dma_devconfig(host->dma, source,
|
|
host->mem->start + host->sdidata);
|
|
|
|
if (!setup_ok) {
|
|
s3c2410_dma_config(host->dma, 4);
|
|
s3c2410_dma_set_buffdone_fn(host->dma,
|
|
s3cmci_dma_done_callback);
|
|
s3c2410_dma_setflags(host->dma, S3C2410_DMAF_AUTOSTART);
|
|
setup_ok = 1;
|
|
}
|
|
}
|
|
|
|
static void s3cmci_send_command(struct s3cmci_host *host,
|
|
struct mmc_command *cmd)
|
|
{
|
|
u32 ccon, imsk;
|
|
|
|
imsk = S3C2410_SDIIMSK_CRCSTATUS | S3C2410_SDIIMSK_CMDTIMEOUT |
|
|
S3C2410_SDIIMSK_RESPONSEND | S3C2410_SDIIMSK_CMDSENT |
|
|
S3C2410_SDIIMSK_RESPONSECRC;
|
|
|
|
enable_imask(host, imsk);
|
|
|
|
if (cmd->data)
|
|
host->complete_what = COMPLETION_XFERFINISH_RSPFIN;
|
|
else if (cmd->flags & MMC_RSP_PRESENT)
|
|
host->complete_what = COMPLETION_RSPFIN;
|
|
else
|
|
host->complete_what = COMPLETION_CMDSENT;
|
|
|
|
writel(cmd->arg, host->base + S3C2410_SDICMDARG);
|
|
|
|
ccon = cmd->opcode & S3C2410_SDICMDCON_INDEX;
|
|
ccon |= S3C2410_SDICMDCON_SENDERHOST | S3C2410_SDICMDCON_CMDSTART;
|
|
|
|
if (cmd->flags & MMC_RSP_PRESENT)
|
|
ccon |= S3C2410_SDICMDCON_WAITRSP;
|
|
|
|
if (cmd->flags & MMC_RSP_136)
|
|
ccon |= S3C2410_SDICMDCON_LONGRSP;
|
|
|
|
writel(ccon, host->base + S3C2410_SDICMDCON);
|
|
}
|
|
|
|
static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
|
|
{
|
|
u32 dcon, imsk, stoptries = 3;
|
|
|
|
/* write DCON register */
|
|
|
|
if (!data) {
|
|
writel(0, host->base + S3C2410_SDIDCON);
|
|
return 0;
|
|
}
|
|
|
|
if ((data->blksz & 3) != 0) {
|
|
/* We cannot deal with unaligned blocks with more than
|
|
* one block being transfered. */
|
|
|
|
if (data->blocks > 1) {
|
|
pr_warning("%s: can't do non-word sized block transfers (blksz %d)\n", __func__, data->blksz);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
while (readl(host->base + S3C2410_SDIDSTA) &
|
|
(S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {
|
|
|
|
dbg(host, dbg_err,
|
|
"mci_setup_data() transfer stillin progress.\n");
|
|
|
|
writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
|
|
s3cmci_reset(host);
|
|
|
|
if ((stoptries--) == 0) {
|
|
dbg_dumpregs(host, "DRF");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
dcon = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
|
|
|
|
if (s3cmci_host_usedma(host))
|
|
dcon |= S3C2410_SDIDCON_DMAEN;
|
|
|
|
if (host->bus_width == MMC_BUS_WIDTH_4)
|
|
dcon |= S3C2410_SDIDCON_WIDEBUS;
|
|
|
|
if (!(data->flags & MMC_DATA_STREAM))
|
|
dcon |= S3C2410_SDIDCON_BLOCKMODE;
|
|
|
|
if (data->flags & MMC_DATA_WRITE) {
|
|
dcon |= S3C2410_SDIDCON_TXAFTERRESP;
|
|
dcon |= S3C2410_SDIDCON_XFER_TXSTART;
|
|
}
|
|
|
|
if (data->flags & MMC_DATA_READ) {
|
|
dcon |= S3C2410_SDIDCON_RXAFTERCMD;
|
|
dcon |= S3C2410_SDIDCON_XFER_RXSTART;
|
|
}
|
|
|
|
if (host->is2440) {
|
|
dcon |= S3C2440_SDIDCON_DS_WORD;
|
|
dcon |= S3C2440_SDIDCON_DATSTART;
|
|
}
|
|
|
|
writel(dcon, host->base + S3C2410_SDIDCON);
|
|
|
|
/* write BSIZE register */
|
|
|
|
writel(data->blksz, host->base + S3C2410_SDIBSIZE);
|
|
|
|
/* add to IMASK register */
|
|
imsk = S3C2410_SDIIMSK_FIFOFAIL | S3C2410_SDIIMSK_DATACRC |
|
|
S3C2410_SDIIMSK_DATATIMEOUT | S3C2410_SDIIMSK_DATAFINISH;
|
|
|
|
enable_imask(host, imsk);
|
|
|
|
/* write TIMER register */
|
|
|
|
if (host->is2440) {
|
|
writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
|
|
} else {
|
|
writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
|
|
|
|
/* FIX: set slow clock to prevent timeouts on read */
|
|
if (data->flags & MMC_DATA_READ)
|
|
writel(0xFF, host->base + S3C2410_SDIPRE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define BOTH_DIR (MMC_DATA_WRITE | MMC_DATA_READ)
|
|
|
|
static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
|
|
{
|
|
int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
|
|
|
|
BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
|
|
|
|
host->pio_sgptr = 0;
|
|
host->pio_bytes = 0;
|
|
host->pio_count = 0;
|
|
host->pio_active = rw ? XFER_WRITE : XFER_READ;
|
|
|
|
if (rw) {
|
|
do_pio_write(host);
|
|
enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
|
|
} else {
|
|
enable_imask(host, S3C2410_SDIIMSK_RXFIFOHALF
|
|
| S3C2410_SDIIMSK_RXFIFOLAST);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
|
|
{
|
|
int dma_len, i;
|
|
int rw = data->flags & MMC_DATA_WRITE;
|
|
|
|
BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
|
|
|
|
s3cmci_dma_setup(host, rw ? S3C2410_DMASRC_MEM : S3C2410_DMASRC_HW);
|
|
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
|
|
|
|
dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
|
|
rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
|
|
|
|
if (dma_len == 0)
|
|
return -ENOMEM;
|
|
|
|
host->dma_complete = 0;
|
|
host->dmatogo = dma_len;
|
|
|
|
for (i = 0; i < dma_len; i++) {
|
|
int res;
|
|
|
|
dbg(host, dbg_dma, "enqueue %i: %08x@%u\n", i,
|
|
sg_dma_address(&data->sg[i]),
|
|
sg_dma_len(&data->sg[i]));
|
|
|
|
res = s3c2410_dma_enqueue(host->dma, host,
|
|
sg_dma_address(&data->sg[i]),
|
|
sg_dma_len(&data->sg[i]));
|
|
|
|
if (res) {
|
|
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
|
|
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_START);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void s3cmci_send_request(struct mmc_host *mmc)
|
|
{
|
|
struct s3cmci_host *host = mmc_priv(mmc);
|
|
struct mmc_request *mrq = host->mrq;
|
|
struct mmc_command *cmd = host->cmd_is_stop ? mrq->stop : mrq->cmd;
|
|
|
|
host->ccnt++;
|
|
prepare_dbgmsg(host, cmd, host->cmd_is_stop);
|
|
|
|
/* Clear command, data and fifo status registers
|
|
Fifo clear only necessary on 2440, but doesn't hurt on 2410
|
|
*/
|
|
writel(0xFFFFFFFF, host->base + S3C2410_SDICMDSTAT);
|
|
writel(0xFFFFFFFF, host->base + S3C2410_SDIDSTA);
|
|
writel(0xFFFFFFFF, host->base + S3C2410_SDIFSTA);
|
|
|
|
if (cmd->data) {
|
|
int res = s3cmci_setup_data(host, cmd->data);
|
|
|
|
host->dcnt++;
|
|
|
|
if (res) {
|
|
dbg(host, dbg_err, "setup data error %d\n", res);
|
|
cmd->error = res;
|
|
cmd->data->error = res;
|
|
|
|
mmc_request_done(mmc, mrq);
|
|
return;
|
|
}
|
|
|
|
if (s3cmci_host_usedma(host))
|
|
res = s3cmci_prepare_dma(host, cmd->data);
|
|
else
|
|
res = s3cmci_prepare_pio(host, cmd->data);
|
|
|
|
if (res) {
|
|
dbg(host, dbg_err, "data prepare error %d\n", res);
|
|
cmd->error = res;
|
|
cmd->data->error = res;
|
|
|
|
mmc_request_done(mmc, mrq);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Send command */
|
|
s3cmci_send_command(host, cmd);
|
|
|
|
/* Enable Interrupt */
|
|
s3cmci_enable_irq(host, true);
|
|
}
|
|
|
|
static int s3cmci_card_present(struct mmc_host *mmc)
|
|
{
|
|
struct s3cmci_host *host = mmc_priv(mmc);
|
|
struct s3c24xx_mci_pdata *pdata = host->pdata;
|
|
int ret;
|
|
|
|
if (pdata->gpio_detect == 0)
|
|
return -ENOSYS;
|
|
|
|
ret = gpio_get_value(pdata->gpio_detect) ? 0 : 1;
|
|
return ret ^ pdata->detect_invert;
|
|
}
|
|
|
|
static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
{
|
|
struct s3cmci_host *host = mmc_priv(mmc);
|
|
|
|
host->status = "mmc request";
|
|
host->cmd_is_stop = 0;
|
|
host->mrq = mrq;
|
|
|
|
if (s3cmci_card_present(mmc) == 0) {
|
|
dbg(host, dbg_err, "%s: no medium present\n", __func__);
|
|
host->mrq->cmd->error = -ENOMEDIUM;
|
|
mmc_request_done(mmc, mrq);
|
|
} else
|
|
s3cmci_send_request(mmc);
|
|
}
|
|
|
|
static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
|
|
{
|
|
u32 mci_psc;
|
|
|
|
/* Set clock */
|
|
for (mci_psc = 0; mci_psc < 255; mci_psc++) {
|
|
host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
|
|
|
|
if (host->real_rate <= ios->clock)
|
|
break;
|
|
}
|
|
|
|
if (mci_psc > 255)
|
|
mci_psc = 255;
|
|
|
|
host->prescaler = mci_psc;
|
|
writel(host->prescaler, host->base + S3C2410_SDIPRE);
|
|
|
|
/* If requested clock is 0, real_rate will be 0, too */
|
|
if (ios->clock == 0)
|
|
host->real_rate = 0;
|
|
}
|
|
|
|
static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct s3cmci_host *host = mmc_priv(mmc);
|
|
u32 mci_con;
|
|
|
|
/* Set the power state */
|
|
|
|
mci_con = readl(host->base + S3C2410_SDICON);
|
|
|
|
switch (ios->power_mode) {
|
|
case MMC_POWER_ON:
|
|
case MMC_POWER_UP:
|
|
s3c2410_gpio_cfgpin(S3C2410_GPE(5), S3C2410_GPE5_SDCLK);
|
|
s3c2410_gpio_cfgpin(S3C2410_GPE(6), S3C2410_GPE6_SDCMD);
|
|
s3c2410_gpio_cfgpin(S3C2410_GPE(7), S3C2410_GPE7_SDDAT0);
|
|
s3c2410_gpio_cfgpin(S3C2410_GPE(8), S3C2410_GPE8_SDDAT1);
|
|
s3c2410_gpio_cfgpin(S3C2410_GPE(9), S3C2410_GPE9_SDDAT2);
|
|
s3c2410_gpio_cfgpin(S3C2410_GPE(10), S3C2410_GPE10_SDDAT3);
|
|
|
|
if (host->pdata->set_power)
|
|
host->pdata->set_power(ios->power_mode, ios->vdd);
|
|
|
|
if (!host->is2440)
|
|
mci_con |= S3C2410_SDICON_FIFORESET;
|
|
|
|
break;
|
|
|
|
case MMC_POWER_OFF:
|
|
default:
|
|
gpio_direction_output(S3C2410_GPE(5), 0);
|
|
|
|
if (host->is2440)
|
|
mci_con |= S3C2440_SDICON_SDRESET;
|
|
|
|
if (host->pdata->set_power)
|
|
host->pdata->set_power(ios->power_mode, ios->vdd);
|
|
|
|
break;
|
|
}
|
|
|
|
s3cmci_set_clk(host, ios);
|
|
|
|
/* Set CLOCK_ENABLE */
|
|
if (ios->clock)
|
|
mci_con |= S3C2410_SDICON_CLOCKTYPE;
|
|
else
|
|
mci_con &= ~S3C2410_SDICON_CLOCKTYPE;
|
|
|
|
writel(mci_con, host->base + S3C2410_SDICON);
|
|
|
|
if ((ios->power_mode == MMC_POWER_ON) ||
|
|
(ios->power_mode == MMC_POWER_UP)) {
|
|
dbg(host, dbg_conf, "running at %lukHz (requested: %ukHz).\n",
|
|
host->real_rate/1000, ios->clock/1000);
|
|
} else {
|
|
dbg(host, dbg_conf, "powered down.\n");
|
|
}
|
|
|
|
host->bus_width = ios->bus_width;
|
|
}
|
|
|
|
static void s3cmci_reset(struct s3cmci_host *host)
|
|
{
|
|
u32 con = readl(host->base + S3C2410_SDICON);
|
|
|
|
con |= S3C2440_SDICON_SDRESET;
|
|
writel(con, host->base + S3C2410_SDICON);
|
|
}
|
|
|
|
static int s3cmci_get_ro(struct mmc_host *mmc)
|
|
{
|
|
struct s3cmci_host *host = mmc_priv(mmc);
|
|
struct s3c24xx_mci_pdata *pdata = host->pdata;
|
|
int ret;
|
|
|
|
if (pdata->no_wprotect)
|
|
return 0;
|
|
|
|
ret = s3c2410_gpio_getpin(pdata->gpio_wprotect);
|
|
|
|
if (pdata->wprotect_invert)
|
|
ret = !ret;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
|
|
{
|
|
struct s3cmci_host *host = mmc_priv(mmc);
|
|
unsigned long flags;
|
|
u32 con;
|
|
|
|
local_irq_save(flags);
|
|
|
|
con = readl(host->base + S3C2410_SDICON);
|
|
host->sdio_irqen = enable;
|
|
|
|
if (enable == host->sdio_irqen)
|
|
goto same_state;
|
|
|
|
if (enable) {
|
|
con |= S3C2410_SDICON_SDIOIRQ;
|
|
enable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
|
|
|
|
if (!host->irq_state && !host->irq_disabled) {
|
|
host->irq_state = true;
|
|
enable_irq(host->irq);
|
|
}
|
|
} else {
|
|
disable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
|
|
con &= ~S3C2410_SDICON_SDIOIRQ;
|
|
|
|
if (!host->irq_enabled && host->irq_state) {
|
|
disable_irq_nosync(host->irq);
|
|
host->irq_state = false;
|
|
}
|
|
}
|
|
|
|
writel(con, host->base + S3C2410_SDICON);
|
|
|
|
same_state:
|
|
local_irq_restore(flags);
|
|
|
|
s3cmci_check_sdio_irq(host);
|
|
}
|
|
|
|
static struct mmc_host_ops s3cmci_ops = {
|
|
.request = s3cmci_request,
|
|
.set_ios = s3cmci_set_ios,
|
|
.get_ro = s3cmci_get_ro,
|
|
.get_cd = s3cmci_card_present,
|
|
.enable_sdio_irq = s3cmci_enable_sdio_irq,
|
|
};
|
|
|
|
static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
|
|
/* This is currently here to avoid a number of if (host->pdata)
|
|
* checks. Any zero fields to ensure reaonable defaults are picked. */
|
|
};
|
|
|
|
#ifdef CONFIG_CPU_FREQ
|
|
|
|
static int s3cmci_cpufreq_transition(struct notifier_block *nb,
|
|
unsigned long val, void *data)
|
|
{
|
|
struct s3cmci_host *host;
|
|
struct mmc_host *mmc;
|
|
unsigned long newclk;
|
|
unsigned long flags;
|
|
|
|
host = container_of(nb, struct s3cmci_host, freq_transition);
|
|
newclk = clk_get_rate(host->clk);
|
|
mmc = host->mmc;
|
|
|
|
if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
|
|
(val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
|
|
spin_lock_irqsave(&mmc->lock, flags);
|
|
|
|
host->clk_rate = newclk;
|
|
|
|
if (mmc->ios.power_mode != MMC_POWER_OFF &&
|
|
mmc->ios.clock != 0)
|
|
s3cmci_set_clk(host, &mmc->ios);
|
|
|
|
spin_unlock_irqrestore(&mmc->lock, flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
|
|
{
|
|
host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
|
|
|
|
return cpufreq_register_notifier(&host->freq_transition,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
}
|
|
|
|
static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
|
|
{
|
|
cpufreq_unregister_notifier(&host->freq_transition,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
}
|
|
|
|
#else
|
|
static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
static int s3cmci_state_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct s3cmci_host *host = seq->private;
|
|
|
|
seq_printf(seq, "Register base = 0x%08x\n", (u32)host->base);
|
|
seq_printf(seq, "Clock rate = %ld\n", host->clk_rate);
|
|
seq_printf(seq, "Prescale = %d\n", host->prescaler);
|
|
seq_printf(seq, "is2440 = %d\n", host->is2440);
|
|
seq_printf(seq, "IRQ = %d\n", host->irq);
|
|
seq_printf(seq, "IRQ enabled = %d\n", host->irq_enabled);
|
|
seq_printf(seq, "IRQ disabled = %d\n", host->irq_disabled);
|
|
seq_printf(seq, "IRQ state = %d\n", host->irq_state);
|
|
seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);
|
|
seq_printf(seq, "Do DMA = %d\n", s3cmci_host_usedma(host));
|
|
seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);
|
|
seq_printf(seq, "SDIDATA at %d\n", host->sdidata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3cmci_state_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, s3cmci_state_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations s3cmci_fops_state = {
|
|
.owner = THIS_MODULE,
|
|
.open = s3cmci_state_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
#define DBG_REG(_r) { .addr = S3C2410_SDI##_r, .name = #_r }
|
|
|
|
struct s3cmci_reg {
|
|
unsigned short addr;
|
|
unsigned char *name;
|
|
} debug_regs[] = {
|
|
DBG_REG(CON),
|
|
DBG_REG(PRE),
|
|
DBG_REG(CMDARG),
|
|
DBG_REG(CMDCON),
|
|
DBG_REG(CMDSTAT),
|
|
DBG_REG(RSP0),
|
|
DBG_REG(RSP1),
|
|
DBG_REG(RSP2),
|
|
DBG_REG(RSP3),
|
|
DBG_REG(TIMER),
|
|
DBG_REG(BSIZE),
|
|
DBG_REG(DCON),
|
|
DBG_REG(DCNT),
|
|
DBG_REG(DSTA),
|
|
DBG_REG(FSTA),
|
|
{}
|
|
};
|
|
|
|
static int s3cmci_regs_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct s3cmci_host *host = seq->private;
|
|
struct s3cmci_reg *rptr = debug_regs;
|
|
|
|
for (; rptr->name; rptr++)
|
|
seq_printf(seq, "SDI%s\t=0x%08x\n", rptr->name,
|
|
readl(host->base + rptr->addr));
|
|
|
|
seq_printf(seq, "SDIIMSK\t=0x%08x\n", readl(host->base + host->sdiimsk));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3cmci_regs_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, s3cmci_regs_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations s3cmci_fops_regs = {
|
|
.owner = THIS_MODULE,
|
|
.open = s3cmci_regs_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static void s3cmci_debugfs_attach(struct s3cmci_host *host)
|
|
{
|
|
struct device *dev = &host->pdev->dev;
|
|
|
|
host->debug_root = debugfs_create_dir(dev_name(dev), NULL);
|
|
if (IS_ERR(host->debug_root)) {
|
|
dev_err(dev, "failed to create debugfs root\n");
|
|
return;
|
|
}
|
|
|
|
host->debug_state = debugfs_create_file("state", 0444,
|
|
host->debug_root, host,
|
|
&s3cmci_fops_state);
|
|
|
|
if (IS_ERR(host->debug_state))
|
|
dev_err(dev, "failed to create debug state file\n");
|
|
|
|
host->debug_regs = debugfs_create_file("regs", 0444,
|
|
host->debug_root, host,
|
|
&s3cmci_fops_regs);
|
|
|
|
if (IS_ERR(host->debug_regs))
|
|
dev_err(dev, "failed to create debug regs file\n");
|
|
}
|
|
|
|
static void s3cmci_debugfs_remove(struct s3cmci_host *host)
|
|
{
|
|
debugfs_remove(host->debug_regs);
|
|
debugfs_remove(host->debug_state);
|
|
debugfs_remove(host->debug_root);
|
|
}
|
|
|
|
#else
|
|
static inline void s3cmci_debugfs_attach(struct s3cmci_host *host) { }
|
|
static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }
|
|
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
static int __devinit s3cmci_probe(struct platform_device *pdev)
|
|
{
|
|
struct s3cmci_host *host;
|
|
struct mmc_host *mmc;
|
|
int ret;
|
|
int is2440;
|
|
int i;
|
|
|
|
is2440 = platform_get_device_id(pdev)->driver_data;
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
|
|
if (!mmc) {
|
|
ret = -ENOMEM;
|
|
goto probe_out;
|
|
}
|
|
|
|
for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++) {
|
|
ret = gpio_request(i, dev_name(&pdev->dev));
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to get gpio %d\n", i);
|
|
|
|
for (i--; i >= S3C2410_GPE(5); i--)
|
|
gpio_free(i);
|
|
|
|
goto probe_free_host;
|
|
}
|
|
}
|
|
|
|
host = mmc_priv(mmc);
|
|
host->mmc = mmc;
|
|
host->pdev = pdev;
|
|
host->is2440 = is2440;
|
|
|
|
host->pdata = pdev->dev.platform_data;
|
|
if (!host->pdata) {
|
|
pdev->dev.platform_data = &s3cmci_def_pdata;
|
|
host->pdata = &s3cmci_def_pdata;
|
|
}
|
|
|
|
spin_lock_init(&host->complete_lock);
|
|
tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
|
|
|
|
if (is2440) {
|
|
host->sdiimsk = S3C2440_SDIIMSK;
|
|
host->sdidata = S3C2440_SDIDATA;
|
|
host->clk_div = 1;
|
|
} else {
|
|
host->sdiimsk = S3C2410_SDIIMSK;
|
|
host->sdidata = S3C2410_SDIDATA;
|
|
host->clk_div = 2;
|
|
}
|
|
|
|
host->complete_what = COMPLETION_NONE;
|
|
host->pio_active = XFER_NONE;
|
|
|
|
#ifdef CONFIG_MMC_S3C_PIODMA
|
|
host->dodma = host->pdata->dma;
|
|
#endif
|
|
|
|
host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!host->mem) {
|
|
dev_err(&pdev->dev,
|
|
"failed to get io memory region resouce.\n");
|
|
|
|
ret = -ENOENT;
|
|
goto probe_free_gpio;
|
|
}
|
|
|
|
host->mem = request_mem_region(host->mem->start,
|
|
resource_size(host->mem), pdev->name);
|
|
|
|
if (!host->mem) {
|
|
dev_err(&pdev->dev, "failed to request io memory region.\n");
|
|
ret = -ENOENT;
|
|
goto probe_free_gpio;
|
|
}
|
|
|
|
host->base = ioremap(host->mem->start, resource_size(host->mem));
|
|
if (!host->base) {
|
|
dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
|
|
ret = -EINVAL;
|
|
goto probe_free_mem_region;
|
|
}
|
|
|
|
host->irq = platform_get_irq(pdev, 0);
|
|
if (host->irq == 0) {
|
|
dev_err(&pdev->dev, "failed to get interrupt resouce.\n");
|
|
ret = -EINVAL;
|
|
goto probe_iounmap;
|
|
}
|
|
|
|
if (request_irq(host->irq, s3cmci_irq, 0, DRIVER_NAME, host)) {
|
|
dev_err(&pdev->dev, "failed to request mci interrupt.\n");
|
|
ret = -ENOENT;
|
|
goto probe_iounmap;
|
|
}
|
|
|
|
/* We get spurious interrupts even when we have set the IMSK
|
|
* register to ignore everything, so use disable_irq() to make
|
|
* ensure we don't lock the system with un-serviceable requests. */
|
|
|
|
disable_irq(host->irq);
|
|
host->irq_state = false;
|
|
|
|
if (!host->pdata->no_detect) {
|
|
ret = gpio_request(host->pdata->gpio_detect, "s3cmci detect");
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to get detect gpio\n");
|
|
goto probe_free_irq;
|
|
}
|
|
|
|
host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
|
|
|
|
if (host->irq_cd >= 0) {
|
|
if (request_irq(host->irq_cd, s3cmci_irq_cd,
|
|
IRQF_TRIGGER_RISING |
|
|
IRQF_TRIGGER_FALLING,
|
|
DRIVER_NAME, host)) {
|
|
dev_err(&pdev->dev,
|
|
"can't get card detect irq.\n");
|
|
ret = -ENOENT;
|
|
goto probe_free_gpio_cd;
|
|
}
|
|
} else {
|
|
dev_warn(&pdev->dev,
|
|
"host detect has no irq available\n");
|
|
gpio_direction_input(host->pdata->gpio_detect);
|
|
}
|
|
} else
|
|
host->irq_cd = -1;
|
|
|
|
if (!host->pdata->no_wprotect) {
|
|
ret = gpio_request(host->pdata->gpio_wprotect, "s3cmci wp");
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to get writeprotect\n");
|
|
goto probe_free_irq_cd;
|
|
}
|
|
|
|
gpio_direction_input(host->pdata->gpio_wprotect);
|
|
}
|
|
|
|
/* depending on the dma state, get a dma channel to use. */
|
|
|
|
if (s3cmci_host_usedma(host)) {
|
|
host->dma = s3c2410_dma_request(DMACH_SDI, &s3cmci_dma_client,
|
|
host);
|
|
if (host->dma < 0) {
|
|
dev_err(&pdev->dev, "cannot get DMA channel.\n");
|
|
if (!s3cmci_host_canpio()) {
|
|
ret = -EBUSY;
|
|
goto probe_free_gpio_wp;
|
|
} else {
|
|
dev_warn(&pdev->dev, "falling back to PIO.\n");
|
|
host->dodma = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
host->clk = clk_get(&pdev->dev, "sdi");
|
|
if (IS_ERR(host->clk)) {
|
|
dev_err(&pdev->dev, "failed to find clock source.\n");
|
|
ret = PTR_ERR(host->clk);
|
|
host->clk = NULL;
|
|
goto probe_free_dma;
|
|
}
|
|
|
|
ret = clk_enable(host->clk);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to enable clock source.\n");
|
|
goto clk_free;
|
|
}
|
|
|
|
host->clk_rate = clk_get_rate(host->clk);
|
|
|
|
mmc->ops = &s3cmci_ops;
|
|
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
|
|
#ifdef CONFIG_MMC_S3C_HW_SDIO_IRQ
|
|
mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
|
|
#else
|
|
mmc->caps = MMC_CAP_4_BIT_DATA;
|
|
#endif
|
|
mmc->f_min = host->clk_rate / (host->clk_div * 256);
|
|
mmc->f_max = host->clk_rate / host->clk_div;
|
|
|
|
if (host->pdata->ocr_avail)
|
|
mmc->ocr_avail = host->pdata->ocr_avail;
|
|
|
|
mmc->max_blk_count = 4095;
|
|
mmc->max_blk_size = 4095;
|
|
mmc->max_req_size = 4095 * 512;
|
|
mmc->max_seg_size = mmc->max_req_size;
|
|
|
|
mmc->max_phys_segs = 128;
|
|
mmc->max_hw_segs = 128;
|
|
|
|
dbg(host, dbg_debug,
|
|
"probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%u.\n",
|
|
(host->is2440?"2440":""),
|
|
host->base, host->irq, host->irq_cd, host->dma);
|
|
|
|
ret = s3cmci_cpufreq_register(host);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to register cpufreq\n");
|
|
goto free_dmabuf;
|
|
}
|
|
|
|
ret = mmc_add_host(mmc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to add mmc host.\n");
|
|
goto free_cpufreq;
|
|
}
|
|
|
|
s3cmci_debugfs_attach(host);
|
|
|
|
platform_set_drvdata(pdev, mmc);
|
|
dev_info(&pdev->dev, "%s - using %s, %s SDIO IRQ\n", mmc_hostname(mmc),
|
|
s3cmci_host_usedma(host) ? "dma" : "pio",
|
|
mmc->caps & MMC_CAP_SDIO_IRQ ? "hw" : "sw");
|
|
|
|
return 0;
|
|
|
|
free_cpufreq:
|
|
s3cmci_cpufreq_deregister(host);
|
|
|
|
free_dmabuf:
|
|
clk_disable(host->clk);
|
|
|
|
clk_free:
|
|
clk_put(host->clk);
|
|
|
|
probe_free_dma:
|
|
if (s3cmci_host_usedma(host))
|
|
s3c2410_dma_free(host->dma, &s3cmci_dma_client);
|
|
|
|
probe_free_gpio_wp:
|
|
if (!host->pdata->no_wprotect)
|
|
gpio_free(host->pdata->gpio_wprotect);
|
|
|
|
probe_free_gpio_cd:
|
|
if (!host->pdata->no_detect)
|
|
gpio_free(host->pdata->gpio_detect);
|
|
|
|
probe_free_irq_cd:
|
|
if (host->irq_cd >= 0)
|
|
free_irq(host->irq_cd, host);
|
|
|
|
probe_free_irq:
|
|
free_irq(host->irq, host);
|
|
|
|
probe_iounmap:
|
|
iounmap(host->base);
|
|
|
|
probe_free_mem_region:
|
|
release_mem_region(host->mem->start, resource_size(host->mem));
|
|
|
|
probe_free_gpio:
|
|
for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
|
|
gpio_free(i);
|
|
|
|
probe_free_host:
|
|
mmc_free_host(mmc);
|
|
|
|
probe_out:
|
|
return ret;
|
|
}
|
|
|
|
static void s3cmci_shutdown(struct platform_device *pdev)
|
|
{
|
|
struct mmc_host *mmc = platform_get_drvdata(pdev);
|
|
struct s3cmci_host *host = mmc_priv(mmc);
|
|
|
|
if (host->irq_cd >= 0)
|
|
free_irq(host->irq_cd, host);
|
|
|
|
s3cmci_debugfs_remove(host);
|
|
s3cmci_cpufreq_deregister(host);
|
|
mmc_remove_host(mmc);
|
|
clk_disable(host->clk);
|
|
}
|
|
|
|
static int __devexit s3cmci_remove(struct platform_device *pdev)
|
|
{
|
|
struct mmc_host *mmc = platform_get_drvdata(pdev);
|
|
struct s3cmci_host *host = mmc_priv(mmc);
|
|
struct s3c24xx_mci_pdata *pd = host->pdata;
|
|
int i;
|
|
|
|
s3cmci_shutdown(pdev);
|
|
|
|
clk_put(host->clk);
|
|
|
|
tasklet_disable(&host->pio_tasklet);
|
|
|
|
if (s3cmci_host_usedma(host))
|
|
s3c2410_dma_free(host->dma, &s3cmci_dma_client);
|
|
|
|
free_irq(host->irq, host);
|
|
|
|
if (!pd->no_wprotect)
|
|
gpio_free(pd->gpio_wprotect);
|
|
|
|
if (!pd->no_detect)
|
|
gpio_free(pd->gpio_detect);
|
|
|
|
for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
|
|
gpio_free(i);
|
|
|
|
|
|
iounmap(host->base);
|
|
release_mem_region(host->mem->start, resource_size(host->mem));
|
|
|
|
mmc_free_host(mmc);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_device_id s3cmci_driver_ids[] = {
|
|
{
|
|
.name = "s3c2410-sdi",
|
|
.driver_data = 0,
|
|
}, {
|
|
.name = "s3c2412-sdi",
|
|
.driver_data = 1,
|
|
}, {
|
|
.name = "s3c2440-sdi",
|
|
.driver_data = 1,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(platform, s3cmci_driver_ids);
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int s3cmci_suspend(struct device *dev)
|
|
{
|
|
struct mmc_host *mmc = platform_get_drvdata(to_platform_device(dev));
|
|
struct pm_message event = { PM_EVENT_SUSPEND };
|
|
|
|
return mmc_suspend_host(mmc, event);
|
|
}
|
|
|
|
static int s3cmci_resume(struct device *dev)
|
|
{
|
|
struct mmc_host *mmc = platform_get_drvdata(to_platform_device(dev));
|
|
|
|
return mmc_resume_host(mmc);
|
|
}
|
|
|
|
static struct dev_pm_ops s3cmci_pm = {
|
|
.suspend = s3cmci_suspend,
|
|
.resume = s3cmci_resume,
|
|
};
|
|
|
|
#define s3cmci_pm_ops &s3cmci_pm
|
|
#else /* CONFIG_PM */
|
|
#define s3cmci_pm_ops NULL
|
|
#endif /* CONFIG_PM */
|
|
|
|
|
|
static struct platform_driver s3cmci_driver = {
|
|
.driver = {
|
|
.name = "s3c-sdi",
|
|
.owner = THIS_MODULE,
|
|
.pm = s3cmci_pm_ops,
|
|
},
|
|
.id_table = s3cmci_driver_ids,
|
|
.probe = s3cmci_probe,
|
|
.remove = __devexit_p(s3cmci_remove),
|
|
.shutdown = s3cmci_shutdown,
|
|
};
|
|
|
|
static int __init s3cmci_init(void)
|
|
{
|
|
return platform_driver_register(&s3cmci_driver);
|
|
}
|
|
|
|
static void __exit s3cmci_exit(void)
|
|
{
|
|
platform_driver_unregister(&s3cmci_driver);
|
|
}
|
|
|
|
module_init(s3cmci_init);
|
|
module_exit(s3cmci_exit);
|
|
|
|
MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");
|