1 // SPDX-License-Identifier: GPL-2.0-only
3  *  cb710/mmc.c
5  *  Copyright by Michał Mirosław, 2008-2009
11 #include "cb710-mmc.h"
20 	(ARRAY_SIZE(cb710_clock_divider_log2) - 1)
27 static void cb710_mmc_select_clock_divider(struct mmc_host *mmc, int hz)  in cb710_mmc_select_clock_divider()  argument
29 	struct cb710_slot *slot = cb710_mmc_to_slot(mmc);  in cb710_mmc_select_clock_divider()
30 	struct pci_dev *pdev = cb710_slot_to_chip(slot)->pdev;  in cb710_mmc_select_clock_divider()
37 	 *   indexes 1-7 work as written in the table  in cb710_mmc_select_clock_divider()
38 	 *   indexes 0,8-15 give no clock output  in cb710_mmc_select_clock_divider()
66 	 * - it gets set later if any interrupt sources are enabled */  in __cb710_mmc_enable_irq()
71 	 * -> bit 15 port 0x0C seems to be global interrupt enable  in __cb710_mmc_enable_irq()
89 	spin_lock_irqsave(&reader->irq_lock, flags);  in cb710_mmc_enable_irq()
92 	spin_unlock_irqrestore(&reader->irq_lock, flags);  in cb710_mmc_enable_irq()
133 		return -EIO;  in cb710_check_event()
156 		if (!--limit) {  in cb710_wait_for_event()
159 			err = -ETIMEDOUT;  in cb710_wait_for_event()
168 	limit = 2000000 - limit;  in cb710_wait_for_event()
189 		if (!--limit) {  in cb710_wait_while_busy()
192 			err = -ETIMEDOUT;  in cb710_wait_while_busy()
201 	limit = 500000 - limit;  in cb710_wait_while_busy()
215 		((count - 1) << 16)|(blocksize - 1));  in cb710_mmc_set_transfer_size()
223 	/* without this, received data is prepended with 8-bytes of zeroes */  in cb710_mmc_fifo_hack()
237 		"FIFO-read-hack: expected STATUS0 bit was %s\n",  in cb710_mmc_fifo_hack()
240 		"FIFO-read-hack: dwords ignored: %08X %08X - %s\n",  in cb710_mmc_fifo_hack()
255 		slot->iobase + CB710_MMC_DATA_PORT, dw_count);  in cb710_mmc_receive_pio()
262 	return !(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8));  in cb710_is_transfer_size_supported()
268 	size_t len, blocks = data->blocks;  in cb710_mmc_receive()
271 	/* TODO: I don't know how/if the hardware handles non-16B-boundary blocks  in cb710_mmc_receive()
273 	if (unlikely(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8)))  in cb710_mmc_receive()
274 		return -EINVAL;  in cb710_mmc_receive()
276 	sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_TO_SG);  in cb710_mmc_receive()
283 	while (blocks-- > 0) {  in cb710_mmc_receive()
284 		len = data->blksz;  in cb710_mmc_receive()
290 			len -= 16;  in cb710_mmc_receive()
297 			len - 1, CB710_MMC_C2_READ_PIO_SIZE_MASK);  in cb710_mmc_receive()
312 	size_t len, blocks = data->blocks;  in cb710_mmc_send()
316 	 * non-16B-boundary blocks */  in cb710_mmc_send()
317 	if (unlikely(data->blocks > 1 && data->blksz & 15))  in cb710_mmc_send()
318 		return -EINVAL;  in cb710_mmc_send()
320 	sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_FROM_SG);  in cb710_mmc_send()
325 	while (blocks-- > 0) {  in cb710_mmc_send()
326 		len = (data->blksz + 15) >> 4;  in cb710_mmc_send()
336 				slot->iobase + CB710_MMC_DATA_PORT, 4);  in cb710_mmc_send()
337 		} while (--len);  in cb710_mmc_send()
347 	unsigned int flags = cmd->flags;  in cb710_encode_cmd_flags()
350 	/* Windows driver returned 0 for commands for which no response  in cb710_encode_cmd_flags()
355 	 * Original driver set bit 14 for MMC/SD application  in cb710_encode_cmd_flags()
356 	 * commands. There's no difference 'on the wire' and  in cb710_encode_cmd_flags()
370 	cb_flags |= cmd->opcode << CB710_MMC_CMD_CODE_SHIFT;  in cb710_encode_cmd_flags()
372 	if (cmd->data && (cmd->data->flags & MMC_DATA_READ))  in cb710_encode_cmd_flags()
382 		 * I assume that 00 here means no response is expected.  in cb710_encode_cmd_flags()
401 	if (cmd->flags & MMC_RSP_136) {  in cb710_receive_response()
410 		cmd->resp[0] = (resp[0] << 8)|(resp[1] >> 24);  in cb710_receive_response()
411 		cmd->resp[1] = (resp[1] << 8)|(resp[2] >> 24);  in cb710_receive_response()
412 		cmd->resp[2] = (resp[2] << 8)|(resp[3] >> 24);  in cb710_receive_response()
413 		cmd->resp[3] = (resp[3] << 8);  in cb710_receive_response()
416 		cmd->resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);  in cb710_receive_response()
419 	wanted_opcode = (cmd->flags & MMC_RSP_OPCODE) ? cmd->opcode : 0x3F;  in cb710_receive_response()
421 		cmd->error = -EILSEQ;  in cb710_receive_response()
429 	if (data->flags & MMC_DATA_READ)  in cb710_mmc_transfer_data()
439 		data->bytes_xfered = data->blksz * data->blocks;  in cb710_mmc_transfer_data()
443 static int cb710_mmc_command(struct mmc_host *mmc, struct mmc_command *cmd)  in cb710_mmc_command()  argument
445 	struct cb710_slot *slot = cb710_mmc_to_slot(mmc);  in cb710_mmc_command()
446 	struct cb710_mmc_reader *reader = mmc_priv(mmc);  in cb710_mmc_command()
447 	struct mmc_data *data = cmd->data;  in cb710_mmc_command()
454 			data->error = -EINVAL;  in cb710_mmc_command()
455 			return -1;  in cb710_mmc_command()
457 		cb710_mmc_set_transfer_size(slot, data->blocks, data->blksz);  in cb710_mmc_command()
463 	cb710_write_port_32(slot, CB710_MMC_CMD_PARAM_PORT, cmd->arg);  in cb710_mmc_command()
468 	cmd->error = cb710_wait_for_event(slot, CB710_MMC_S1_COMMAND_SENT);  in cb710_mmc_command()
469 	if (cmd->error)  in cb710_mmc_command()
470 		return -1;  in cb710_mmc_command()
472 	if (cmd->flags & MMC_RSP_PRESENT) {  in cb710_mmc_command()
474 		if (cmd->error)  in cb710_mmc_command()
475 			return -1;  in cb710_mmc_command()
479 		data->error = cb710_mmc_transfer_data(slot, data);  in cb710_mmc_command()
483 static void cb710_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)  in cb710_mmc_request()  argument
485 	struct cb710_slot *slot = cb710_mmc_to_slot(mmc);  in cb710_mmc_request()
486 	struct cb710_mmc_reader *reader = mmc_priv(mmc);  in cb710_mmc_request()
488 	WARN_ON(reader->mrq != NULL);  in cb710_mmc_request()
490 	reader->mrq = mrq;  in cb710_mmc_request()
493 	if (!cb710_mmc_command(mmc, mrq->cmd) && mrq->stop)  in cb710_mmc_request()
494 		cb710_mmc_command(mmc, mrq->stop);  in cb710_mmc_request()
496 	queue_work(system_bh_wq, &reader->finish_req_bh_work);  in cb710_mmc_request()
545 	 * (it doesn't depend on write-to-read delay) */  in cb710_mmc_powerup()
560 static void cb710_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)  in cb710_mmc_set_ios()  argument
562 	struct cb710_slot *slot = cb710_mmc_to_slot(mmc);  in cb710_mmc_set_ios()
563 	struct cb710_mmc_reader *reader = mmc_priv(mmc);  in cb710_mmc_set_ios()
566 	cb710_mmc_select_clock_divider(mmc, ios->clock);  in cb710_mmc_set_ios()
568 	if (ios->power_mode != reader->last_power_mode) {  in cb710_mmc_set_ios()
569 		switch (ios->power_mode) {  in cb710_mmc_set_ios()
574 					"powerup failed (%d)- retrying\n", err);  in cb710_mmc_set_ios()
580 						"powerup retry failed (%d) - expect errors\n",  in cb710_mmc_set_ios()
583 			reader->last_power_mode = MMC_POWER_ON;  in cb710_mmc_set_ios()
587 			reader->last_power_mode = MMC_POWER_OFF;  in cb710_mmc_set_ios()
596 	cb710_mmc_enable_4bit_data(slot, ios->bus_width != MMC_BUS_WIDTH_1);  in cb710_mmc_set_ios()
601 static int cb710_mmc_get_ro(struct mmc_host *mmc)  in cb710_mmc_get_ro()  argument
603 	struct cb710_slot *slot = cb710_mmc_to_slot(mmc);  in cb710_mmc_get_ro()
609 static int cb710_mmc_get_cd(struct mmc_host *mmc)  in cb710_mmc_get_cd()  argument
611 	struct cb710_slot *slot = cb710_mmc_to_slot(mmc);  in cb710_mmc_get_cd()
619 	struct mmc_host *mmc = cb710_slot_to_mmc(slot);  in cb710_mmc_irq_handler()  local
620 	struct cb710_mmc_reader *reader = mmc_priv(mmc);  in cb710_mmc_irq_handler()
638 			mmc_detect_change(mmc, HZ/5);  in cb710_mmc_irq_handler()
641 		spin_lock(&reader->irq_lock);  in cb710_mmc_irq_handler()
643 		spin_unlock(&reader->irq_lock);  in cb710_mmc_irq_handler()
653 	struct mmc_request *mrq = reader->mrq;  in cb710_mmc_finish_request_bh_work()
655 	reader->mrq = NULL;  in cb710_mmc_finish_request_bh_work()
690 	struct mmc_host *mmc;  in cb710_mmc_init()  local
695 	mmc = mmc_alloc_host(sizeof(*reader), cb710_slot_dev(slot));  in cb710_mmc_init()
696 	if (!mmc)  in cb710_mmc_init()
697 		return -ENOMEM;  in cb710_mmc_init()
699 	platform_set_drvdata(pdev, mmc);  in cb710_mmc_init()
702 	pci_read_config_dword(chip->pdev, 0x48, &val);  in cb710_mmc_init()
707 	mmc->ops = &cb710_mmc_host;  in cb710_mmc_init()
708 	mmc->f_max = val;  in cb710_mmc_init()
709 	mmc->f_min = val >> cb710_clock_divider_log2[CB710_MAX_DIVIDER_IDX];  in cb710_mmc_init()
710 	mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;  in cb710_mmc_init()
711 	mmc->caps = MMC_CAP_4_BIT_DATA;  in cb710_mmc_init()
715 	 * use of the cmd->busy_timeout.  in cb710_mmc_init()
717 	mmc->max_busy_timeout = CB710_MMC_REQ_TIMEOUT_MS;  in cb710_mmc_init()
719 	reader = mmc_priv(mmc);  in cb710_mmc_init()
721 	INIT_WORK(&reader->finish_req_bh_work,  in cb710_mmc_init()
723 	spin_lock_init(&reader->irq_lock);  in cb710_mmc_init()
729 	err = mmc_add_host(mmc);  in cb710_mmc_init()
734 		mmc_hostname(mmc));  in cb710_mmc_init()
744 	mmc_free_host(mmc);  in cb710_mmc_init()
751 	struct mmc_host *mmc = cb710_slot_to_mmc(slot);  in cb710_mmc_exit()  local
752 	struct cb710_mmc_reader *reader = mmc_priv(mmc);  in cb710_mmc_exit()
756 	mmc_remove_host(mmc);  in cb710_mmc_exit()
762 	/* clear config ports - just in case */  in cb710_mmc_exit()
766 	cancel_work_sync(&reader->finish_req_bh_work);  in cb710_mmc_exit()
768 	mmc_free_host(mmc);  in cb710_mmc_exit()
772 	.driver.name = "cb710-mmc",
783 MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
784 MODULE_DESCRIPTION("ENE CB710 memory card reader driver - MMC/SD part");
786 MODULE_ALIAS("platform:cb710-mmc");