478 lines
11 KiB
C
478 lines
11 KiB
C
/*
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* (C) Copyright 2009 SAMSUNG Electronics
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* Minkyu Kang <mk7.kang@samsung.com>
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* Jaehoon Chung <jh80.chung@samsung.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <mmc.h>
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#include <asm/io.h>
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#include <asm/arch/mmc.h>
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/* support 4 mmc hosts */
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struct mmc mmc_dev[4];
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struct mmc_host mmc_host[4];
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static inline struct s5p_mmc *s5p_get_base_mmc(int dev_index)
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{
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unsigned long offset = dev_index * sizeof(struct s5p_mmc);
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return (struct s5p_mmc *)(samsung_get_base_mmc() + offset);
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}
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static void mmc_prepare_data(struct mmc_host *host, struct mmc_data *data)
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{
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unsigned char ctrl;
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debug("data->dest: %08x\n", (u32)data->dest);
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writel((u32)data->dest, &host->reg->sysad);
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/*
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* DMASEL[4:3]
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* 00 = Selects SDMA
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* 01 = Reserved
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* 10 = Selects 32-bit Address ADMA2
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* 11 = Selects 64-bit Address ADMA2
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*/
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ctrl = readb(&host->reg->hostctl);
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ctrl &= ~(3 << 3);
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writeb(ctrl, &host->reg->hostctl);
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/* We do not handle DMA boundaries, so set it to max (512 KiB) */
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writew((7 << 12) | (512 << 0), &host->reg->blksize);
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writew(data->blocks, &host->reg->blkcnt);
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}
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static void mmc_set_transfer_mode(struct mmc_host *host, struct mmc_data *data)
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{
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unsigned short mode;
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/*
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* TRNMOD
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* MUL1SIN0[5] : Multi/Single Block Select
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* RD1WT0[4] : Data Transfer Direction Select
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* 1 = read
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* 0 = write
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* ENACMD12[2] : Auto CMD12 Enable
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* ENBLKCNT[1] : Block Count Enable
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* ENDMA[0] : DMA Enable
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*/
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mode = (1 << 1) | (1 << 0);
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if (data->blocks > 1)
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mode |= (1 << 5);
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if (data->flags & MMC_DATA_READ)
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mode |= (1 << 4);
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writew(mode, &host->reg->trnmod);
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}
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static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
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struct mmc_data *data)
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{
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struct mmc_host *host = (struct mmc_host *)mmc->priv;
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int flags, i;
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unsigned int timeout;
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unsigned int mask;
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unsigned int retry = 0x100000;
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/* Wait max 10 ms */
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timeout = 10;
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/*
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* PRNSTS
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* CMDINHDAT[1] : Command Inhibit (DAT)
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* CMDINHCMD[0] : Command Inhibit (CMD)
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*/
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mask = (1 << 0);
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if ((data != NULL) || (cmd->resp_type & MMC_RSP_BUSY))
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mask |= (1 << 1);
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/*
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* We shouldn't wait for data inihibit for stop commands, even
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* though they might use busy signaling
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*/
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if (data)
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mask &= ~(1 << 1);
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while (readl(&host->reg->prnsts) & mask) {
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if (timeout == 0) {
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printf("%s: timeout error\n", __func__);
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return -1;
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}
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timeout--;
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udelay(1000);
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}
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if (data)
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mmc_prepare_data(host, data);
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debug("cmd->arg: %08x\n", cmd->cmdarg);
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writel(cmd->cmdarg, &host->reg->argument);
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if (data)
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mmc_set_transfer_mode(host, data);
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if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
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return -1;
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/*
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* CMDREG
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* CMDIDX[13:8] : Command index
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* DATAPRNT[5] : Data Present Select
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* ENCMDIDX[4] : Command Index Check Enable
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* ENCMDCRC[3] : Command CRC Check Enable
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* RSPTYP[1:0]
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* 00 = No Response
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* 01 = Length 136
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* 10 = Length 48
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* 11 = Length 48 Check busy after response
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*/
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if (!(cmd->resp_type & MMC_RSP_PRESENT))
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flags = 0;
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else if (cmd->resp_type & MMC_RSP_136)
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flags = (1 << 0);
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else if (cmd->resp_type & MMC_RSP_BUSY)
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flags = (3 << 0);
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else
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flags = (2 << 0);
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if (cmd->resp_type & MMC_RSP_CRC)
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flags |= (1 << 3);
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if (cmd->resp_type & MMC_RSP_OPCODE)
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flags |= (1 << 4);
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if (data)
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flags |= (1 << 5);
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debug("cmd: %d\n", cmd->cmdidx);
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writew((cmd->cmdidx << 8) | flags, &host->reg->cmdreg);
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for (i = 0; i < retry; i++) {
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mask = readl(&host->reg->norintsts);
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/* Command Complete */
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if (mask & (1 << 0)) {
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if (!data)
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writel(mask, &host->reg->norintsts);
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break;
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}
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}
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if (i == retry) {
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printf("%s: waiting for status update\n", __func__);
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return TIMEOUT;
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}
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if (mask & (1 << 16)) {
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/* Timeout Error */
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debug("timeout: %08x cmd %d\n", mask, cmd->cmdidx);
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return TIMEOUT;
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} else if (mask & (1 << 15)) {
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/* Error Interrupt */
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debug("error: %08x cmd %d\n", mask, cmd->cmdidx);
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return -1;
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}
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if (cmd->resp_type & MMC_RSP_PRESENT) {
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if (cmd->resp_type & MMC_RSP_136) {
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/* CRC is stripped so we need to do some shifting. */
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for (i = 0; i < 4; i++) {
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unsigned int offset =
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(unsigned int)(&host->reg->rspreg3 - i);
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cmd->response[i] = readl(offset) << 8;
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if (i != 3) {
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cmd->response[i] |=
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readb(offset - 1);
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}
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debug("cmd->resp[%d]: %08x\n",
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i, cmd->response[i]);
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}
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} else if (cmd->resp_type & MMC_RSP_BUSY) {
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for (i = 0; i < retry; i++) {
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/* PRNTDATA[23:20] : DAT[3:0] Line Signal */
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if (readl(&host->reg->prnsts)
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& (1 << 20)) /* DAT[0] */
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break;
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}
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if (i == retry) {
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printf("%s: card is still busy\n", __func__);
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return TIMEOUT;
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}
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cmd->response[0] = readl(&host->reg->rspreg0);
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debug("cmd->resp[0]: %08x\n", cmd->response[0]);
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} else {
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cmd->response[0] = readl(&host->reg->rspreg0);
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debug("cmd->resp[0]: %08x\n", cmd->response[0]);
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}
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}
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if (data) {
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while (1) {
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mask = readl(&host->reg->norintsts);
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if (mask & (1 << 15)) {
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/* Error Interrupt */
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writel(mask, &host->reg->norintsts);
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printf("%s: error during transfer: 0x%08x\n",
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__func__, mask);
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return -1;
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} else if (mask & (1 << 3)) {
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/* DMA Interrupt */
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debug("DMA end\n");
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break;
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} else if (mask & (1 << 1)) {
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/* Transfer Complete */
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debug("r/w is done\n");
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break;
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}
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}
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writel(mask, &host->reg->norintsts);
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}
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udelay(1000);
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return 0;
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}
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static void mmc_change_clock(struct mmc_host *host, uint clock)
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{
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int div;
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unsigned short clk;
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unsigned long timeout;
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unsigned long ctrl2;
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/*
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* SELBASECLK[5:4]
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* 00/01 = HCLK
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* 10 = EPLL
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* 11 = XTI or XEXTCLK
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*/
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ctrl2 = readl(&host->reg->control2);
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ctrl2 &= ~(3 << 4);
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ctrl2 |= (2 << 4);
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writel(ctrl2, &host->reg->control2);
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writew(0, &host->reg->clkcon);
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/* XXX: we assume that clock is between 40MHz and 50MHz */
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if (clock == 0)
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goto out;
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else if (clock <= 400000)
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div = 0x100;
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else if (clock <= 20000000)
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div = 4;
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else if (clock <= 26000000)
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div = 2;
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else
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div = 1;
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debug("div: %d\n", div);
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div >>= 1;
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/*
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* CLKCON
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* SELFREQ[15:8] : base clock divied by value
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* ENSDCLK[2] : SD Clock Enable
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* STBLINTCLK[1] : Internal Clock Stable
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* ENINTCLK[0] : Internal Clock Enable
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*/
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clk = (div << 8) | (1 << 0);
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writew(clk, &host->reg->clkcon);
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/* Wait max 10 ms */
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timeout = 10;
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while (!(readw(&host->reg->clkcon) & (1 << 1))) {
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if (timeout == 0) {
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printf("%s: timeout error\n", __func__);
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return;
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}
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timeout--;
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udelay(1000);
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}
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clk |= (1 << 2);
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writew(clk, &host->reg->clkcon);
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out:
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host->clock = clock;
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}
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static void mmc_set_ios(struct mmc *mmc)
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{
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struct mmc_host *host = mmc->priv;
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unsigned char ctrl;
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unsigned long val;
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debug("bus_width: %x, clock: %d\n", mmc->bus_width, mmc->clock);
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/*
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* SELCLKPADDS[17:16]
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* 00 = 2mA
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* 01 = 4mA
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* 10 = 7mA
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* 11 = 9mA
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*/
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writel(0x3 << 16, &host->reg->control4);
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val = readl(&host->reg->control2);
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val &= (0x3 << 4);
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val |= (1 << 31) | /* write status clear async mode enable */
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(1 << 30) | /* command conflict mask enable */
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(1 << 14) | /* Feedback Clock Enable for Rx Clock */
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(1 << 8); /* SDCLK hold enable */
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writel(val, &host->reg->control2);
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/*
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* FCSEL1[15] FCSEL0[7]
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* FCSel[1:0] : Rx Feedback Clock Delay Control
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* Inverter delay means10ns delay if SDCLK 50MHz setting
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* 01 = Delay1 (basic delay)
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* 11 = Delay2 (basic delay + 2ns)
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* 00 = Delay3 (inverter delay)
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* 10 = Delay4 (inverter delay + 2ns)
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*/
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writel(0x8080, &host->reg->control3);
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mmc_change_clock(host, mmc->clock);
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ctrl = readb(&host->reg->hostctl);
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/*
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* WIDE8[5]
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* 0 = Depend on WIDE4
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* 1 = 8-bit mode
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* WIDE4[1]
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* 1 = 4-bit mode
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* 0 = 1-bit mode
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*/
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if (mmc->bus_width == 8)
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ctrl |= (1 << 5);
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else if (mmc->bus_width == 4)
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ctrl |= (1 << 1);
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else
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ctrl &= ~(1 << 1);
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/*
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* OUTEDGEINV[2]
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* 1 = Riging edge output
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* 0 = Falling edge output
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*/
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ctrl &= ~(1 << 2);
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writeb(ctrl, &host->reg->hostctl);
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}
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static void mmc_reset(struct mmc_host *host)
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{
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unsigned int timeout;
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/*
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* RSTALL[0] : Software reset for all
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* 1 = reset
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* 0 = work
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*/
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writeb((1 << 0), &host->reg->swrst);
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host->clock = 0;
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/* Wait max 100 ms */
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timeout = 100;
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/* hw clears the bit when it's done */
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while (readb(&host->reg->swrst) & (1 << 0)) {
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if (timeout == 0) {
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printf("%s: timeout error\n", __func__);
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return;
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}
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timeout--;
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udelay(1000);
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}
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}
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static int mmc_core_init(struct mmc *mmc)
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{
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struct mmc_host *host = (struct mmc_host *)mmc->priv;
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unsigned int mask;
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mmc_reset(host);
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host->version = readw(&host->reg->hcver);
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/* mask all */
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writel(0xffffffff, &host->reg->norintstsen);
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writel(0xffffffff, &host->reg->norintsigen);
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writeb(0xe, &host->reg->timeoutcon); /* TMCLK * 2^27 */
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/*
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* NORMAL Interrupt Status Enable Register init
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* [5] ENSTABUFRDRDY : Buffer Read Ready Status Enable
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* [4] ENSTABUFWTRDY : Buffer write Ready Status Enable
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* [1] ENSTASTANSCMPLT : Transfre Complete Status Enable
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* [0] ENSTACMDCMPLT : Command Complete Status Enable
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*/
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mask = readl(&host->reg->norintstsen);
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mask &= ~(0xffff);
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mask |= (1 << 5) | (1 << 4) | (1 << 1) | (1 << 0);
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writel(mask, &host->reg->norintstsen);
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/*
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* NORMAL Interrupt Signal Enable Register init
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* [1] ENSTACMDCMPLT : Transfer Complete Signal Enable
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*/
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mask = readl(&host->reg->norintsigen);
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mask &= ~(0xffff);
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mask |= (1 << 1);
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writel(mask, &host->reg->norintsigen);
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return 0;
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}
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static int s5p_mmc_initialize(int dev_index, int bus_width)
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{
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struct mmc *mmc;
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mmc = &mmc_dev[dev_index];
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sprintf(mmc->name, "SAMSUNG SD/MMC");
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mmc->priv = &mmc_host[dev_index];
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mmc->send_cmd = mmc_send_cmd;
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mmc->set_ios = mmc_set_ios;
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mmc->init = mmc_core_init;
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mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
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if (bus_width == 8)
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mmc->host_caps = MMC_MODE_8BIT;
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else
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mmc->host_caps = MMC_MODE_4BIT;
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mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
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mmc->f_min = 400000;
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mmc->f_max = 52000000;
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mmc_host[dev_index].clock = 0;
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mmc_host[dev_index].reg = s5p_get_base_mmc(dev_index);
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mmc_register(mmc);
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return 0;
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}
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int s5p_mmc_init(int dev_index, int bus_width)
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{
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return s5p_mmc_initialize(dev_index, bus_width);
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}
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