mirror of
https://github.com/Rockbox/rockbox.git
synced 2026-04-12 00:47:49 -04:00
e5e82820f6
The problem with drive strength and things not working reliably at 50 MHz turned out to be entirely caused by the ESD diodes on the data/command/clock lines, which have a whopping 200-300 pF junction capacitance -- 6-10x higher than the 30 pF limit given by the MMC spec. After desoldering the diodes the bus seems stable at 50 MHz and with any drive strength (note MEDIUM is still fast enough even for 50 MHz, so the drive strength is unchanged). Change-Id: If9847ee4145f5ed2f7e172cfa89acad0737a897f
118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2025 by Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "sdmmc_host.h"
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#include "clock-echoplayer.h"
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#include "sdmmc-stm32h7.h"
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#include "gpio-stm32h7.h"
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#include "nvic-arm.h"
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#include "regs/stm32h743/sdmmc.h"
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/* 300ms poll interval */
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#define SDCARD_POLL_TICKS (300 * HZ / 1000)
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static struct sdmmc_host sdmmc1;
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static struct stm32h7_sdmmc_controller sdmmc1_ctl;
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static const struct sdmmc_controller_ops sdmmc_ops = {
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.set_power_enabled = stm32h7_sdmmc_set_power_enabled,
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.set_bus_width = stm32h7_sdmmc_set_bus_width,
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.set_bus_clock = stm32h7_sdmmc_set_bus_clock,
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.submit_command = stm32h7_sdmmc_submit_command,
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.abort_command = stm32h7_sdmmc_abort_command,
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};
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static const struct sdmmc_host_config sdmmc_config INITDATA_ATTR = {
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.type = STORAGE_SD,
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.bus_voltages = SDMMC_BUS_VOLTAGE_3V2_3V3 |
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SDMMC_BUS_VOLTAGE_3V3_3V4,
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.bus_widths = SDMMC_BUS_WIDTH_1BIT |
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SDMMC_BUS_WIDTH_4BIT,
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.bus_clocks = SDMMC_BUS_CLOCK_400KHZ |
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SDMMC_BUS_CLOCK_25MHZ |
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SDMMC_BUS_CLOCK_50MHZ,
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.max_nr_blocks = 65535,
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.is_removable = true,
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};
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/*
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* simple SD insertion poller
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*/
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struct sdmmc_poll
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{
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struct sdmmc_host *host;
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bool is_inserted;
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bool last_state;
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bool curr_state;
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};
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static bool is_sdcard_inserted(void)
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{
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return gpio_get_level(GPIO_SDMMC_DETECT) == 0;
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}
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static int poll_sdcard_inserted(struct timeout *tmo)
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{
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struct sdmmc_poll *poll = (void *)tmo->data;
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poll->last_state = poll->curr_state;
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poll->curr_state = is_sdcard_inserted();
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if (!poll->curr_state && poll->is_inserted)
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{
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poll->is_inserted = false;
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sdmmc_host_set_medium_present(poll->host, false);
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}
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else if (poll->curr_state && !poll->is_inserted &&
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poll->curr_state == poll->last_state)
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{
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poll->is_inserted = true;
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sdmmc_host_set_medium_present(poll->host, true);
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}
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return SDCARD_POLL_TICKS;
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}
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static struct timeout sdcard_poll_timeout;
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static struct sdmmc_poll sdcard_poll;
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void sdmmc_host_target_init(void)
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{
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/* Initialize controller */
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stm32h7_sdmmc_init(&sdmmc1_ctl, ITA_SDMMC1, &sdmmc1_ker_clock,
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stm32h7_reset_sdmmc1, NULL);
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nvic_enable_irq(NVIC_IRQN_SDMMC1);
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/* Initialize card detect polling */
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sdcard_poll.host = &sdmmc1;
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sdcard_poll.is_inserted = is_sdcard_inserted();
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timeout_register(&sdcard_poll_timeout, poll_sdcard_inserted,
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SDCARD_POLL_TICKS, (intptr_t)&sdcard_poll);
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/* Initialize SD/MMC host driver */
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sdmmc_host_init(&sdmmc1, &sdmmc_config, &sdmmc_ops, &sdmmc1_ctl);
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sdmmc_host_init_medium_present(&sdmmc1, sdcard_poll.is_inserted);
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}
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void sdmmc1_irq_handler(void)
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{
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stm32h7_sdmmc_irq_handler(&sdmmc1_ctl);
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}
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