/* * drivers/mmc/mmc_bus.c * * MMC bus protocol interfaces  * * Copyright (C) 2001-2003 MIZI Research, Inc. * * Author: Yong-iL Joh <tolkien@mizi.com> * $Id: mmc_bus.c,v 1.2 2004/01/26 08:29:56 laputa Exp $ * * Revision History: * * 2001-XX-XX Yong-iL Joh <tolkien@mizi.com> * - initial release * * 2002-07-25 Chan Gyun Jeong <cgjeong@mizi.com> * - code cleanup  * * 2002-12-07 Chan Gyun Jeong <cgjeong@mizi.com> * - rough restructuring for S3C2410 SD Controller * */#include <linux/config.h>#include <linux/module.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/errno.h>#include <linux/delay.h>#ifdef CONFIG_PROC_FS#include <linux/proc_fs.h>#endif#include "mmc.h"#define MMC_RETRIES_MAX		20#define MMC_RETRIES_SD_CHECK	2#define MMC_OP_COND_DELAY	set_current_state(TASK_INTERRUPTIBLE); \				schedule_timeout(HZ/10)static DECLARE_MUTEX(mmc_slots_mutex);static struct mmc_slot *mmc_slots[MAX_MMC_SLOTS];static struct mmc_notifier *mmc_notifiers;const int mmc_res_len[] = {	0,	MMC_RES_LEN_SHORT,	MMC_RES_LEN_SHORT,	MMC_RES_LEN_LONG,	MMC_RES_LEN_SHORT,	MMC_RES_LEN_SHORT,	MMC_RES_LEN_SHORT,	MMC_RES_LEN_SHORT,};/*====================================================================*//* Data Conversion utilities */void mmc_str2cid(CID_regs *regs, __u8 *buff){	int i;	regs->mid = buff[0];	regs->oid = (buff[1] << 8) | (buff[2]);	for(i=0; i < 6; i++)		regs->pnm[i] = buff[3+i];	regs->pnm[6] = '\0';	regs->prv = buff[9];	regs->psn = (buff[10] << 24) | (buff[11] << 16) | 		(buff[12] << 8) | buff[13];	regs->mdt = buff[14];}void mmc_str2csd(CSD_regs *regs, __u8 *buff){	regs->csd		= (buff[0] & 0xc0) >> 6;	regs->spec_vers		= (buff[0] & 0x3c) >> 2;	(regs->taac).man	= (buff[1] & 0x78) >> 3;	(regs->taac).exp	= (buff[1]) & 0x07;	regs->nsac		= buff[2];	(regs->tran_speed).man = (buff[3] & 0x78) >> 3;	(regs->tran_speed).exp = (buff[3]) & 0x07;	regs->ccc		= (buff[4] << 4) | ((buff[5] & 0xf0) >> 4);	regs->read_len	= (buff[5] & 0x0f);	regs->read_part	= (buff[6] & 0x80) ? 1 : 0;	regs->write_mis	= (buff[6] & 0x40) ? 1 : 0;	regs->read_mis	= (buff[6] & 0x20) ? 1 : 0;	regs->dsr		= (buff[6] & 0x10) ? 1 : 0;	regs->c_size		= ((buff[6] & 0x03) << 10) |		(buff[7] << 2) | ((buff[8] & 0xc0) >> 6);	regs->vcc_r_min	= (buff[8] & 0x38) >> 3;	regs->vcc_r_max	= (buff[8] & 0x07);	regs->vcc_w_min	= (buff[9] & 0xe0) >> 5;	regs->vcc_w_max	= (buff[9] & 0x1c) >> 2;	regs->c_size_mult = ((buff[9] & 0x03) << 1) | ((buff[10] & 0x80) >> 7);	regs->er_size     = (buff[10] & 0x7c) >> 2;	regs->er_grp_size = ((buff[10] & 0x03) << 3) | 		((buff[11] & 0xe0) >> 5);	regs->wp_grp_size = (buff[11] & 0x1f);	regs->wp_grp_en	= (buff[12] & 0x80) ? 1 : 0;	regs->dflt_ecc	= (buff[12] & 0x60) >> 5;	regs->r2w_factor = (buff[12] & 0x1c) >> 2;	regs->write_len  = ((buff[12] & 0x03) << 2) | ((buff[13] & 0xc0) >> 6);	regs->write_part = (buff[13] & 0x20) ? 1 : 0;	regs->ffmt_grp   = (buff[14] & 0x80) ? 1 : 0;	regs->copy		= (buff[14] & 0x40) ? 1 : 0;	regs->perm_wp		= (buff[14] & 0x20) ? 1 : 0;	regs->tmp_wp		= (buff[14] & 0x10) ? 1 : 0;	regs->ffmt		= (buff[14] & 0x0c) >> 2;	regs->ecc	= (buff[14] & 0x03);}/*====================================================================*//* Information collecting functions */void mmc_get_CSD_info(struct mmc_slot *slot, CSD_regs *csd) {	/* read/write block size */	slot->read_len	= 0x0001 << (csd->read_len);	slot->write_len	= 0x0001 << (csd->write_len);	if (slot->read_len != slot->write_len) {		DEBUG2(1, "read_len(%u) and write_len(%u) are not equal\n",		       slot->read_len, slot->write_len);	}	/* partial block read/write I/O support */	if (csd->read_part) slot->stat |= MMC_READ_PART;	if (csd->write_part) slot->stat |= MMC_WRITE_PART;	if (csd->wp_grp_en) slot->stat |= MMC_WP_GRP_EN;	if (csd->perm_wp) slot->stat |= MMC_PERM_WP;	if (csd->tmp_wp) slot->stat |= MMC_TMP_WP;	/* calculate total card size in bytes */	slot->size = (1 + csd->c_size) * 		(0x01 << (csd->c_size_mult + 2)) * slot->read_len;}static int mmc_do_transfer_1blk(struct mmc_slot *slot, int rd, u_long from, 				u_char *buf){	int ret;	struct mmc_cmd cmd;	DEBUG2(3, "[%s] from: %lu, read: %d\n", __FUNCTION__, from, rd);#if 0	/* I don't know how to do	   if there exists difference between read_len and write_len */	if (!rd && (slot->read_len != slot->write_len))		return -EINVAL;	if ((from % slot->read_len) || (from >= slot->sizes))		return -EINVAL;#endif	ret = down_interruptible(&slot->mutex);	if (ret < 0) {		return ret;	}	/* check card-state. if card-state != StandBy, return BUSY */	cmd.cmd = MMC_CMD13;	cmd.arg = (slot->rca << 16) & 0xffff0000;	cmd.res_type = MMC_RES_TYPE_R1;	cmd.res_flag = 0;	cmd.t_res = MMC_TIME_NCR_MAX;	cmd.t_fin = MMC_TIME_NRC_MIN;	ret = slot->send_cmd(slot, &cmd);	DEBUG2(2, "sent CMD13\n");	if (ret < 0) {		DEBUG2(1, "CMD13 failed, ret = %d\n", ret);		goto err;	}	mmc_str2r1(&(slot->r1), cmd.res);	if (slot->r1 & (R1_cc_err | R1_err)) {		DEBUG2(1, "CMD13 failed, R1(0x%08x)\n", slot->r1);		ret = -EIO;		goto err;	}	if (!(slot->r1 & STATE_STBY)) {		DEBUG2(1, "CMD13 failed, R1(0x%08x): Busy\n", slot->r1);		ret = -EBUSY;		goto err;	}	/* SELECT CARD & set card state from Stand-by to Transfer */	cmd.cmd = MMC_CMD7;	cmd.arg = (slot->rca << 16) & 0xffff0000;	cmd.res_type = MMC_RES_TYPE_R1;	cmd.res_flag = 0;	cmd.t_res = MMC_TIME_NCR_MAX;	cmd.t_fin = MMC_TIME_NRC_MIN;	ret = slot->send_cmd(slot, &cmd);	DEBUG2(2, "sent CMD7\n");	if (ret < 0) {		DEBUG2(1, "CMD7 failed, ret = %d\n", ret);		goto err;	}	mmc_str2r1(&(slot->r1), cmd.res);	if (slot->r1 & (R1_cc_err | R1_err)) {		DEBUG2(1, "CMD7 failed, R1(0x%08x)\n", slot->r1);		ret = -EIO;		goto err;	}	ret = 0;	if (rd) {		/* adtc, 31:0 dadr, R1, READ_SINGLE_BLOCK */		/* set card state from Transfer to Sending-data */		cmd.cmd = MMC_CMD17;		cmd.arg = from;		cmd.res_type = MMC_RES_TYPE_R1;		cmd.res_flag = MMC_RES_FLAG_RDATA;		cmd.data = buf;		cmd.data_len = slot->read_len;		cmd.t_res = MMC_TIME_NCR_MAX;		cmd.t_fin = MMC_TIME_NAC_MIN;		ret = slot->send_cmd(slot, &cmd);		DEBUG2(2, "sent CMD17\n");		if (ret < 0) {			DEBUG2(1, "CMD17 failed, ret = %d\n", ret);		}	} else {		/* adtc, 31:0 dadr, R1, WRITE_SINGLE_BLOCK */		/* set card state from Transfer to Receive-data */		cmd.cmd = MMC_CMD24;		cmd.arg = from;		cmd.res_type = MMC_RES_TYPE_R1;		cmd.res_flag = MMC_RES_FLAG_WDATA;		cmd.data = buf;		cmd.data_len = slot->write_len;		cmd.t_res = MMC_TIME_NCR_MAX;		cmd.t_fin = MMC_TIME_NWR_MIN;		ret = slot->send_cmd(slot, &cmd);		DEBUG2(2, "sent CMD24\n");		if (ret < 0) {			DEBUG2(1, "CMD24 failed, ret = %d\n", ret);		}	}	/* DESELECT CARD */	cmd.cmd = MMC_CMD7;	cmd.arg = 0;	cmd.res_type = MMC_RES_TYPE_NONE;	cmd.res_flag = 0;	cmd.t_fin = MMC_TIME_NRC_MIN;	slot->send_cmd(slot, &cmd);	DEBUG2(2, "sent CMD7(DESELECT)\n"); err:	up(&slot->mutex);	return ret;}inline static int mmc_reset(struct mmc_slot *slot){	int ret;	struct mmc_cmd cmd;	/* go IDLE state */	cmd.cmd = MMC_CMD0;	cmd.arg = 0;	cmd.res_type = MMC_RES_TYPE_NONE;	cmd.res_flag = 0;	cmd.t_fin = MMC_TIME_NCC_MIN;	ret = slot->send_cmd(slot, &cmd);	DEBUG2(2, "sent CMD0\n");	if (ret < 0) {		DEBUG2(1, "CMD0 failed, ret = %d\n", ret);		return ret;	}	/* wait for reset */	if (slot->wait_for_reset) {		slot->wait_for_reset(slot);	}	return 0;}inline static int mmc_identify(struct mmc_slot *slot){	int ret;	int retries = MMC_RETRIES_MAX;	struct mmc_cmd cmd; retry_send_op_cond:	//add by threewater	/* APP_CMD */	cmd.cmd = MMC_CMD55;	cmd.arg = (slot->rca << 16) & 0xffff0000;	cmd.res_type = MMC_RES_TYPE_R1;	cmd.res_flag = 0;	cmd.t_res = MMC_TIME_NCR_MAX;	cmd.t_fin = MMC_TIME_NRC_MIN;	ret = slot->send_cmd(slot, &cmd);	DEBUG2(2, "sent CMD55\n");	if (ret < 0) {		DEBUG2(1, "CMD55 failed!\n");		return ret;	}	/* SEND_OP_COND */	slot->ocr = MMC_VDD_27_36;	cmd.cmd = MMC_CMD42-1 ; //MMC_CMD1;	cmd.arg = slot->ocr;	cmd.res_type = MMC_RES_TYPE_R3;	cmd.res_flag = MMC_RES_FLAG_NOCRC;	cmd.t_res = MMC_TIME_NCR_MAX;	cmd.t_fin = MMC_TIME_NRC_MIN;	ret = slot->send_cmd(slot, &cmd);	DEBUG2(2, "sent CMD1\n");	if (ret < 0) {		DEBUG2(1, "CMD1 failed, ret = %d\n", ret);		if (ret != -ENODEV && retries--) {			ret = mmc_reset(slot);			if (ret < 0) {				return ret;			}			MMC_OP_COND_DELAY;			goto retry_send_op_cond;		}		return -ENODEV;	}	mmc_str2ocr(&(slot->ocr), cmd.res);	if (!(slot->ocr & MMC_nCARD_BUSY)) {		DEBUG2(1, "CMD1 failed, ocr = 0x%08x\n", slot->ocr);