drivers/mmc/mxcmmc.c

127 /* maintainer note: do we really want to have a global host pointer? */
128 static struct mxcmci_host *host = &mxcmci_host;
130 static inline int mxcmci_use_dma(struct mxcmci_host *host)
132 	return host->do_dma;
135 static void mxcmci_softreset(struct mxcmci_host *host)
140 	writel(STR_STP_CLK_RESET, &host->base->str_stp_clk);
142 			&host->base->str_stp_clk);
145 		writel(STR_STP_CLK_START_CLK, &host->base->str_stp_clk);
147 	writel(0xff, &host->base->res_to);
150 static void mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
156 	host->data = data;
158 	writel(nob, &host->base->nob);
159 	writel(blksz, &host->base->blk_len);
160 	host->datasize = datasize;
163 static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_cmd *cmd,
166 	if (host->cmd != NULL)
168 	host->cmd = cmd;
189 	writel(cmd->cmdidx, &host->base->cmd);
190 	writel(cmd->cmdarg, &host->base->arg);
191 	writel(cmdat, &host->base->cmd_dat_cont);
196 static void mxcmci_finish_request(struct mxcmci_host *host,
199 	host->cmd = NULL;
200 	host->data = NULL;
203 static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
225 	host->data = NULL;
230 static int mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
232 	struct mmc_cmd *cmd = host->cmd;
251 				a = readl(&host->base->res_fifo) & 0xFFFF;
252 				b = readl(&host->base->res_fifo) & 0xFFFF;
256 			a = readl(&host->base->res_fifo) & 0xFFFF;
257 			b = readl(&host->base->res_fifo) & 0xFFFF;
258 			c = readl(&host->base->res_fifo) & 0xFFFF;
265 static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
271 		stat = readl(&host->base->status);
281 static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
287 		stat = mxcmci_poll_status(host,
291 		*buf++ = readl(&host->base->buffer_access);
299 		stat = mxcmci_poll_status(host,
303 		tmp = readl(&host->base->buffer_access);
310 static int mxcmci_push(struct mxcmci_host *host, const void *_buf, int bytes)
316 		stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
319 		writel(*buf++, &host->base->buffer_access);
327 		stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
332 		writel(tmp, &host->base->buffer_access);
335 	stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
342 static int mxcmci_transfer_data(struct mxcmci_host *host)
344 	struct mmc_data *data = host->data;
349 	host->datasize = 0;
352 		stat = mxcmci_pull(host, data->dest, length);
355 		host->datasize += length;
357 		stat = mxcmci_push(host, (const void *)(data->src), length);
360 		host->datasize += length;
361 		stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
368 static int mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
373 	ret = mxcmci_read_response(host, stat);
376 		mxcmci_finish_request(host, host->cmd, host->data);
380 	if (!host->data) {
381 		mxcmci_finish_request(host, host->cmd, host->data);
385 	datastat = mxcmci_transfer_data(host);
386 	ret = mxcmci_finish_data(host, datastat);
387 	mxcmci_finish_request(host, host->cmd, host->data);
394 	struct mxcmci_host *host = mmc->priv;
395 	unsigned int cmdat = host->cmdat;
399 	host->cmdat &= ~CMD_DAT_CONT_INIT;
401 		mxcmci_setup_data(host, data);
409 	if ((ret = mxcmci_start_cmd(host, cmd, cmdat))) {
410 		mxcmci_finish_request(host, cmd, data);
415 		stat = readl(&host->base->status);
416 		writel(stat, &host->base->status);
419 	return mxcmci_cmd_done(host, stat);
422 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
449 	writel((prescaler << 4) | divider, &host->base->clk_rate);
454 	struct mxcmci_host *host = mmc->priv;
456 		host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
458 		host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
461 		mxcmci_set_clk_rate(host, mmc->clock);
462 		writel(STR_STP_CLK_START_CLK, &host->base->str_stp_clk);
464 		writel(STR_STP_CLK_STOP_CLK, &host->base->str_stp_clk);
467 	host->clock = mmc->clock;
474 	struct mxcmci_host *host = mmc->priv;
476 	mxcmci_softreset(host);
478 	host->rev_no = readl(&host->base->rev_no);
479 	if (host->rev_no != 0x400) {
481 			host->rev_no);
486 	writel(0x2db4, &host->base->read_to);
488 	writel(0, &host->base->int_cntr);
509 	host->base = (struct mxcmci_regs *)CONFIG_MXC_MCI_REGS_BASE;
514 	host->mmc = mmc_create(&mxcmci_cfg, host);
515 	if (host->mmc == NULL)