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Host Controller v3.00 adds another Capabilities register. Apart from other things, this new register indicates whether the Host Controller supports SDR50, SDR104, and DDR50 UHS-I modes. The spec doesn't mention about explicit support for SDR12 and SDR25 UHS-I modes, so the Host Controller v3.00 should support them by default. Also if the controller supports SDR104 mode, it will also support SDR50 mode as well. So depending on the host support, we set the corresponding MMC_CAP_* flags. One more new register. Host Control2 is added in v3.00, which is used during Signal Voltage Switch procedure described below. Since as per v3.00 spec, UHS-I supported hosts should set S18R to 1, we set S18R (bit 24) of OCR before sending ACMD41. We also need to set XPC (bit 28) of OCR in case the host can supply >150mA. This support is indicated by the Maximum Current Capabilities register of the Host Controller. If the response of ACMD41 has both CCS and S18A set, we start the signal voltage switch procedure, which if successfull, will switch the card from 3.3V signalling to 1.8V signalling. Signal voltage switch procedure adds support for a new command CMD11 in the Physical Layer Spec v3.01. As part of this procedure, we need to set 1.8V Signalling Enable (bit 3) of Host Control2 register, which if remains set after 5ms, means the switch to 1.8V signalling is successfull. Otherwise, we clear bit 24 of OCR and retry the initialization sequence. When we remove the card, and insert the same or another card, we need to make sure that we start with 3.3V signalling voltage. So we call mmc_set_signal_voltage() with MMC_SIGNAL_VOLTAGE_330 set so that we are back to 3.3V signalling voltage before we actually start initializing the card. Tested by Zhangfei Gao with a Toshiba uhs card and general hs card, on mmp2 in SDMA mode. Signed-off-by: Arindam Nath <arindam.nath@amd.com> Reviewed-by: Philip Rakity <prakity@marvell.com> Tested-by: Philip Rakity <prakity@marvell.com> Acked-by: Zhangfei Gao <zhangfei.gao@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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* linux/drivers/mmc/core/core.h
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*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright 2007 Pierre Ossman
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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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#ifndef _MMC_CORE_CORE_H
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#define _MMC_CORE_CORE_H
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#include <linux/delay.h>
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#define MMC_CMD_RETRIES 3
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struct mmc_bus_ops {
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int (*awake)(struct mmc_host *);
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int (*sleep)(struct mmc_host *);
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void (*remove)(struct mmc_host *);
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void (*detect)(struct mmc_host *);
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int (*suspend)(struct mmc_host *);
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int (*resume)(struct mmc_host *);
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int (*power_save)(struct mmc_host *);
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int (*power_restore)(struct mmc_host *);
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};
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void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
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void mmc_detach_bus(struct mmc_host *host);
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void mmc_init_erase(struct mmc_card *card);
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void mmc_set_chip_select(struct mmc_host *host, int mode);
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void mmc_set_clock(struct mmc_host *host, unsigned int hz);
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void mmc_gate_clock(struct mmc_host *host);
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void mmc_ungate_clock(struct mmc_host *host);
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void mmc_set_ungated(struct mmc_host *host);
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void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
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void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
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void mmc_set_bus_width_ddr(struct mmc_host *host, unsigned int width,
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unsigned int ddr);
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u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
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int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage);
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void mmc_set_timing(struct mmc_host *host, unsigned int timing);
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static inline void mmc_delay(unsigned int ms)
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{
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if (ms < 1000 / HZ) {
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cond_resched();
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mdelay(ms);
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} else {
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msleep(ms);
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}
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}
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void mmc_rescan(struct work_struct *work);
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void mmc_start_host(struct mmc_host *host);
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void mmc_stop_host(struct mmc_host *host);
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int mmc_attach_mmc(struct mmc_host *host);
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int mmc_attach_sd(struct mmc_host *host);
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int mmc_attach_sdio(struct mmc_host *host);
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/* Module parameters */
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extern int use_spi_crc;
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/* Debugfs information for hosts and cards */
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void mmc_add_host_debugfs(struct mmc_host *host);
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void mmc_remove_host_debugfs(struct mmc_host *host);
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void mmc_add_card_debugfs(struct mmc_card *card);
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void mmc_remove_card_debugfs(struct mmc_card *card);
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#endif
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