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esp-idf/components/driver/sdmmc_host.c

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdbool.h>
#include <stddef.h>
#include <sys/param.h>
#include "esp_log.h"
#include "esp_intr_alloc.h"
#include "soc/io_mux_reg.h"
#include "rom/gpio.h"
#include "driver/gpio.h"
#include "driver/sdmmc_host.h"
#include "driver/periph_ctrl.h"
#include "sdmmc_private.h"
#include "freertos/semphr.h"
#include "soc/sdmmc_periph.h"
#define SDMMC_EVENT_QUEUE_LENGTH 32
static void sdmmc_isr(void* arg);
static void sdmmc_host_dma_init();
static const char* TAG = "sdmmc_periph";
static intr_handle_t s_intr_handle;
static QueueHandle_t s_event_queue;
static SemaphoreHandle_t s_io_intr_event;
size_t s_slot_width[2] = {1,1};
void sdmmc_host_reset()
{
// Set reset bits
SDMMC.ctrl.controller_reset = 1;
SDMMC.ctrl.dma_reset = 1;
SDMMC.ctrl.fifo_reset = 1;
// Wait for the reset bits to be cleared by hardware
while (SDMMC.ctrl.controller_reset || SDMMC.ctrl.fifo_reset || SDMMC.ctrl.dma_reset) {
;
}
}
/* We have two clock divider stages:
* - one is the clock generator which drives SDMMC peripheral,
* it can be configured using SDMMC.clock register. It can generate
* frequencies 160MHz/(N + 1), where 0 < N < 16, I.e. from 10 to 80 MHz.
* - 4 clock dividers inside SDMMC peripheral, which can divide clock
* from the first stage by 2 * M, where 0 < M < 255
* (they can also be bypassed).
*
* For cards which aren't UHS-1 or UHS-2 cards, which we don't support,
* maximum bus frequency in high speed (HS) mode is 50 MHz.
* Note: for non-UHS-1 cards, HS mode is optional.
* Default speed (DS) mode is mandatory, it works up to 25 MHz.
* Whether the card supports HS or not can be determined using TRAN_SPEED
* field of card's CSD register.
*
* 50 MHz can not be obtained exactly, closest we can get is 53 MHz.
*
* The first stage divider is set to the highest possible value for the given
* frequency, and the the second stage dividers are used if division factor
* is >16.
*
* Of the second stage dividers, div0 is used for card 0, and div1 is used
* for card 1.
*/
static void sdmmc_host_set_clk_div(int div)
{
// Set frequency to 160MHz / div
// div = p + 1
// duty cycle = (h + 1)/(p + 1) (should be = 1/2)
assert (div > 1 && div <= 16);
int p = div - 1;
int h = div / 2 - 1;
SDMMC.clock.div_factor_p = p;
SDMMC.clock.div_factor_h = h;
SDMMC.clock.div_factor_m = p;
// Set phases for in/out clocks
SDMMC.clock.phase_dout = 4; // 180 degree phase on the output clock
SDMMC.clock.phase_din = 4; // 180 degree phase on the input clock
SDMMC.clock.phase_core = 0;
// Wait for the clock to propagate
ets_delay_us(10);
}
static void sdmmc_host_input_clk_disable()
{
SDMMC.clock.val = 0;
}
static void sdmmc_host_clock_update_command(int slot)
{
// Clock update command (not a real command; just updates CIU registers)
sdmmc_hw_cmd_t cmd_val = {
.card_num = slot,
.update_clk_reg = 1,
.wait_complete = 1
};
bool repeat = true;
while(repeat) {
sdmmc_host_start_command(slot, cmd_val, 0);
while (true) {
// Sending clock update command to the CIU can generate HLE error.
// According to the manual, this is okay and we must retry the command.
if (SDMMC.rintsts.hle) {
SDMMC.rintsts.hle = 1;
repeat = true;
break;
}
// When the command is accepted by CIU, start_command bit will be
// cleared in SDMMC.cmd register.
if (SDMMC.cmd.start_command == 0) {
repeat = false;
break;
}
}
}
}
esp_err_t sdmmc_host_set_card_clk(int slot, uint32_t freq_khz)
{
if (!(slot == 0 || slot == 1)) {
return ESP_ERR_INVALID_ARG;
}
const int clk40m = 40000;
// Disable clock first
SDMMC.clkena.cclk_enable &= ~BIT(slot);
sdmmc_host_clock_update_command(slot);
int host_div = 0; /* clock divider of the host (SDMMC.clock) */
int card_div = 0; /* 1/2 of card clock divider (SDMMC.clkdiv) */
// Calculate new dividers
if (freq_khz >= SDMMC_FREQ_HIGHSPEED) {
host_div = 4; // 160 MHz / 4 = 40 MHz
card_div = 0;
} else if (freq_khz == SDMMC_FREQ_DEFAULT) {
host_div = 8; // 160 MHz / 8 = 20 MHz
card_div = 0;
} else if (freq_khz == SDMMC_FREQ_PROBING) {
host_div = 10; // 160 MHz / 10 / (20 * 2) = 400 kHz
card_div = 20;
} else {
host_div = 2;
card_div = (clk40m + freq_khz * 2 - 1) / (freq_khz * 2); // round up
}
ESP_LOGD(TAG, "slot=%d host_div=%d card_div=%d freq=%dkHz",
slot, host_div, card_div,
2 * APB_CLK_FREQ / host_div / ((card_div == 0) ? 1 : card_div * 2) / 1000);
// Program CLKDIV and CLKSRC, send them to the CIU
switch(slot) {
case 0:
SDMMC.clksrc.card0 = 0;
SDMMC.clkdiv.div0 = card_div;
break;
case 1:
SDMMC.clksrc.card1 = 1;
SDMMC.clkdiv.div1 = card_div;
break;
}
sdmmc_host_set_clk_div(host_div);
sdmmc_host_clock_update_command(slot);
// Re-enable clocks
SDMMC.clkena.cclk_enable |= BIT(slot);
SDMMC.clkena.cclk_low_power |= BIT(slot);
sdmmc_host_clock_update_command(slot);
// set data timeout
const uint32_t data_timeout_ms = 100;
uint32_t data_timeout_cycles = data_timeout_ms * freq_khz;
const uint32_t data_timeout_cycles_max = 0xffffff;
if (data_timeout_cycles > data_timeout_cycles_max) {
data_timeout_cycles = data_timeout_cycles_max;
}
SDMMC.tmout.data = data_timeout_cycles;
// always set response timeout to highest value, it's small enough anyway
SDMMC.tmout.response = 255;
return ESP_OK;
}
esp_err_t sdmmc_host_start_command(int slot, sdmmc_hw_cmd_t cmd, uint32_t arg) {
if (!(slot == 0 || slot == 1)) {
return ESP_ERR_INVALID_ARG;
}
if ((SDMMC.cdetect.cards & BIT(slot)) != 0) {
return ESP_ERR_NOT_FOUND;
}
if (cmd.data_expected && cmd.rw && (SDMMC.wrtprt.cards & BIT(slot)) != 0) {
return ESP_ERR_INVALID_STATE;
}
while (SDMMC.cmd.start_command == 1) {
;
}
SDMMC.cmdarg = arg;
cmd.card_num = slot;
cmd.start_command = 1;
SDMMC.cmd = cmd;
return ESP_OK;
}
esp_err_t sdmmc_host_init()
{
if (s_intr_handle) {
return ESP_ERR_INVALID_STATE;
}
periph_module_enable(PERIPH_SDMMC_MODULE);
// Enable clock to peripheral. Use smallest divider first.
sdmmc_host_set_clk_div(2);
// Reset
sdmmc_host_reset();
ESP_LOGD(TAG, "peripheral version %x, hardware config %08x", SDMMC.verid, SDMMC.hcon);
// Clear interrupt status and set interrupt mask to known state
SDMMC.rintsts.val = 0xffffffff;
SDMMC.intmask.val = 0;
SDMMC.ctrl.int_enable = 0;
// Allocate event queue
s_event_queue = xQueueCreate(SDMMC_EVENT_QUEUE_LENGTH, sizeof(sdmmc_event_t));
if (!s_event_queue) {
return ESP_ERR_NO_MEM;
}
s_io_intr_event = xSemaphoreCreateBinary();
if (!s_io_intr_event) {
vQueueDelete(s_event_queue);
s_event_queue = NULL;
return ESP_ERR_NO_MEM;
}
// Attach interrupt handler
esp_err_t ret = esp_intr_alloc(ETS_SDIO_HOST_INTR_SOURCE, 0, &sdmmc_isr, s_event_queue, &s_intr_handle);
if (ret != ESP_OK) {
vQueueDelete(s_event_queue);
s_event_queue = NULL;
vSemaphoreDelete(s_io_intr_event);
s_io_intr_event = NULL;
return ret;
}
// Enable interrupts
SDMMC.intmask.val =
SDMMC_INTMASK_CD |
SDMMC_INTMASK_CMD_DONE |
SDMMC_INTMASK_DATA_OVER |
SDMMC_INTMASK_RCRC | SDMMC_INTMASK_DCRC |
SDMMC_INTMASK_RTO | SDMMC_INTMASK_DTO | SDMMC_INTMASK_HTO |
SDMMC_INTMASK_SBE | SDMMC_INTMASK_EBE |
SDMMC_INTMASK_RESP_ERR | SDMMC_INTMASK_HLE; //sdio is enabled only when use.
SDMMC.ctrl.int_enable = 1;
// Enable DMA
sdmmc_host_dma_init();
// Initialize transaction handler
ret = sdmmc_host_transaction_handler_init();
if (ret != ESP_OK) {
vQueueDelete(s_event_queue);
s_event_queue = NULL;
vSemaphoreDelete(s_io_intr_event);
s_io_intr_event = NULL;
esp_intr_free(s_intr_handle);
s_intr_handle = NULL;
return ret;
}
return ESP_OK;
}
static void configure_pin(int pin)
{
const int sdmmc_func = 3;
const int drive_strength = 3;
assert(pin!=-1);
gpio_pulldown_dis(pin);
uint32_t reg = GPIO_PIN_MUX_REG[pin];
assert(reg != UINT32_MAX);
PIN_INPUT_ENABLE(reg);
PIN_FUNC_SELECT(reg, sdmmc_func);
PIN_SET_DRV(reg, drive_strength);
}
esp_err_t sdmmc_host_init_slot(int slot, const sdmmc_slot_config_t* slot_config)
{
bool pullup = slot_config->flags & SDMMC_SLOT_FLAG_INTERNAL_PULLUP;
if (pullup) {
sdmmc_host_pullup_en(slot, slot_config->width);
}
if (!s_intr_handle) {
return ESP_ERR_INVALID_STATE;
}
if (!(slot == 0 || slot == 1)) {
return ESP_ERR_INVALID_ARG;
}
if (slot_config == NULL) {
return ESP_ERR_INVALID_ARG;
}
int gpio_cd = slot_config->gpio_cd;
int gpio_wp = slot_config->gpio_wp;
uint8_t slot_width = slot_config->width;
// Configure pins
const sdmmc_slot_info_t* pslot = &sdmmc_slot_info[slot];
if (slot_width == SDMMC_SLOT_WIDTH_DEFAULT) {
slot_width = pslot->width;
}
else if (slot_width > pslot->width) {
return ESP_ERR_INVALID_ARG;
}
s_slot_width[slot] = slot_width;
configure_pin(pslot->clk_gpio);
configure_pin(pslot->cmd_gpio);
configure_pin(pslot->d0_gpio);
if (slot_width >= 4) {
configure_pin(pslot->d1_gpio);
configure_pin(pslot->d2_gpio);
//force pull-up D3 to make slave detect SD mode. connect to peripheral after width configuration.
gpio_config_t gpio_conf = {
.pin_bit_mask = BIT(pslot->d3_gpio),
.mode = GPIO_MODE_OUTPUT ,
.pull_up_en = 0,
.pull_down_en = 0,
.intr_type = GPIO_INTR_DISABLE,
};
gpio_config( &gpio_conf );
gpio_set_level( pslot->d3_gpio, 1 );
if (slot_width == 8) {
configure_pin(pslot->d4_gpio);
configure_pin(pslot->d5_gpio);
configure_pin(pslot->d6_gpio);
configure_pin(pslot->d7_gpio);
}
}
// SDIO slave interrupt is edge sensitive to ~(int_n | card_int | card_detect)
// set this and card_detect to high to enable sdio interrupt
gpio_matrix_in(GPIO_FUNC_IN_HIGH, pslot->card_int, false);
// Set up Card Detect input
int matrix_in_cd;
if (gpio_cd != SDMMC_SLOT_NO_CD) {
ESP_LOGD(TAG, "using GPIO%d as CD pin", gpio_cd);
gpio_pad_select_gpio(gpio_cd);
gpio_set_direction(gpio_cd, GPIO_MODE_INPUT);
matrix_in_cd = gpio_cd;
} else {
// if not set, default to CD low (card present)
matrix_in_cd = GPIO_FUNC_IN_LOW;
}
gpio_matrix_in(matrix_in_cd, pslot->card_detect, false);
// Set up Write Protect input
int matrix_in_wp;
if (gpio_wp != SDMMC_SLOT_NO_WP) {
ESP_LOGD(TAG, "using GPIO%d as WP pin", gpio_wp);
gpio_pad_select_gpio(gpio_wp);
gpio_set_direction(gpio_wp, GPIO_MODE_INPUT);
matrix_in_wp = gpio_wp;
} else {
// if not set, default to WP high (not write protected)
matrix_in_wp = GPIO_FUNC_IN_HIGH;
}
// WP signal is normally active low, but hardware expects
// an active-high signal, so invert it in GPIO matrix
gpio_matrix_in(matrix_in_wp, pslot->write_protect, true);
// By default, set probing frequency (400kHz) and 1-bit bus
esp_err_t ret = sdmmc_host_set_card_clk(slot, 400);
if (ret != ESP_OK) {
return ret;
}
ret = sdmmc_host_set_bus_width(slot, 1);
if (ret != ESP_OK) {
return ret;
}
return ESP_OK;
}
esp_err_t sdmmc_host_deinit()
{
if (!s_intr_handle) {
return ESP_ERR_INVALID_STATE;
}
esp_intr_free(s_intr_handle);
s_intr_handle = NULL;
vQueueDelete(s_event_queue);
s_event_queue = NULL;
vQueueDelete(s_io_intr_event);
s_io_intr_event = NULL;
sdmmc_host_input_clk_disable();
sdmmc_host_transaction_handler_deinit();
periph_module_disable(PERIPH_SDMMC_MODULE);
return ESP_OK;
}
esp_err_t sdmmc_host_wait_for_event(int tick_count, sdmmc_event_t* out_event)
{
if (!out_event) {
return ESP_ERR_INVALID_ARG;
}
if (!s_event_queue) {
return ESP_ERR_INVALID_STATE;
}
int ret = xQueueReceive(s_event_queue, out_event, tick_count);
if (ret == pdFALSE) {
return ESP_ERR_TIMEOUT;
}
return ESP_OK;
}
esp_err_t sdmmc_host_set_bus_width(int slot, size_t width)
{
if (!(slot == 0 || slot == 1)) {
return ESP_ERR_INVALID_ARG;
}
if (sdmmc_slot_info[slot].width < width) {
return ESP_ERR_INVALID_ARG;
}
const uint16_t mask = BIT(slot);
if (width == 1) {
SDMMC.ctype.card_width_8 &= ~mask;
SDMMC.ctype.card_width &= ~mask;
} else if (width == 4) {
SDMMC.ctype.card_width_8 &= ~mask;
SDMMC.ctype.card_width |= mask;
configure_pin(sdmmc_slot_info[slot].d3_gpio); // D3 was set to GPIO high to force slave into SD 1-bit mode, until 4-bit mode is set
} else if (width == 8){
SDMMC.ctype.card_width_8 |= mask;
configure_pin(sdmmc_slot_info[slot].d3_gpio); // D3 was set to GPIO high to force slave into SD 1-bit mode, until 4-bit mode is set
} else {
return ESP_ERR_INVALID_ARG;
}
ESP_LOGD(TAG, "slot=%d width=%d", slot, width);
return ESP_OK;
}
size_t sdmmc_host_get_slot_width(int slot)
{
assert( slot == 0 || slot == 1 );
return s_slot_width[slot];
}
static void sdmmc_host_dma_init()
{
SDMMC.ctrl.dma_enable = 1;
SDMMC.bmod.val = 0;
SDMMC.bmod.sw_reset = 1;
SDMMC.idinten.ni = 1;
SDMMC.idinten.ri = 1;
SDMMC.idinten.ti = 1;
}
void sdmmc_host_dma_stop()
{
SDMMC.ctrl.use_internal_dma = 0;
SDMMC.ctrl.dma_reset = 1;
SDMMC.bmod.fb = 0;
SDMMC.bmod.enable = 0;
}
void sdmmc_host_dma_prepare(sdmmc_desc_t* desc, size_t block_size, size_t data_size)
{
// Set size of data and DMA descriptor pointer
SDMMC.bytcnt = data_size;
SDMMC.blksiz = block_size;
SDMMC.dbaddr = desc;
// Enable everything needed to use DMA
SDMMC.ctrl.dma_enable = 1;
SDMMC.ctrl.use_internal_dma = 1;
SDMMC.bmod.enable = 1;
SDMMC.bmod.fb = 1;
sdmmc_host_dma_resume();
}
void sdmmc_host_dma_resume()
{
SDMMC.pldmnd = 1;
}
esp_err_t sdmmc_host_io_int_enable(int slot)
{
configure_pin(sdmmc_slot_info[slot].d1_gpio);
return ESP_OK;
}
esp_err_t sdmmc_host_io_int_wait(int slot, TickType_t timeout_ticks)
{
/* SDIO interrupts are negedge sensitive ones: the status bit is only set
* when first interrupt triggered.
*
* If D1 GPIO is low when entering this function, we know that interrupt
* (in SDIO sense) has occurred and we don't need to use SDMMC peripheral
* interrupt.
*/
SDMMC.intmask.sdio &= ~BIT(slot); /* Disable SDIO interrupt */
SDMMC.rintsts.sdio = BIT(slot);
if (gpio_get_level(sdmmc_slot_info[slot].d1_gpio) == 0) {
return ESP_OK;
}
/* Otherwise, need to wait for an interrupt. Since D1 was high,
* SDMMC peripheral interrupt is guaranteed to trigger on negedge.
*/
xSemaphoreTake(s_io_intr_event, 0);
SDMMC.intmask.sdio |= BIT(slot); /* Re-enable SDIO interrupt */
if (xSemaphoreTake(s_io_intr_event, timeout_ticks) == pdTRUE) {
return ESP_OK;
} else {
return ESP_ERR_TIMEOUT;
}
}
/**
* @brief SDMMC interrupt handler
*
* All communication in SD protocol is driven by the master, and the hardware
* handles things like stop commands automatically.
* So the interrupt handler doesn't need to do much, we just push interrupt
* status into a queue, clear interrupt flags, and let the task currently
* doing communication figure out what to do next.
* This also applies to SDIO interrupts which are generated by the slave.
*
* Card detect interrupts pose a small issue though, because if a card is
* plugged in and out a few times, while there is no task to process
* the events, event queue can become full and some card detect events
* may be dropped. We ignore this problem for now, since the there are no other
* interesting events which can get lost due to this.
*/
static void sdmmc_isr(void* arg) {
QueueHandle_t queue = (QueueHandle_t) arg;
sdmmc_event_t event;
int higher_priority_task_awoken = pdFALSE;
uint32_t pending = SDMMC.mintsts.val & 0xFFFF;
SDMMC.rintsts.val = pending;
event.sdmmc_status = pending;
uint32_t dma_pending = SDMMC.idsts.val;
SDMMC.idsts.val = dma_pending;
event.dma_status = dma_pending & 0x1f;
if (pending != 0 || dma_pending != 0) {
xQueueSendFromISR(queue, &event, &higher_priority_task_awoken);
}
uint32_t sdio_pending = SDMMC.mintsts.sdio;
if (sdio_pending) {
// disable the interrupt (no need to clear here, this is done in sdmmc_host_io_wait_int)
SDMMC.intmask.sdio &= ~sdio_pending;
xSemaphoreGiveFromISR(s_io_intr_event, &higher_priority_task_awoken);
}
if (higher_priority_task_awoken == pdTRUE) {
portYIELD_FROM_ISR();
}
}
esp_err_t sdmmc_host_pullup_en(int slot, int width)
{
if (width > sdmmc_slot_info[slot].width) {
//in esp32 we only support 8 bit in slot 0, note this is occupied by the flash by default
return ESP_ERR_INVALID_ARG;
}
//according to the spec, the host control the clk, we don't to pull it up here
gpio_pullup_en(sdmmc_slot_info[slot].cmd_gpio);
gpio_pullup_en(sdmmc_slot_info[slot].d0_gpio);
if (width >= 4) {
gpio_pullup_en(sdmmc_slot_info[slot].d1_gpio);
gpio_pullup_en(sdmmc_slot_info[slot].d2_gpio);
gpio_pullup_en(sdmmc_slot_info[slot].d3_gpio);
}
if (width == 8) {
gpio_pullup_en(sdmmc_slot_info[slot].d4_gpio);
gpio_pullup_en(sdmmc_slot_info[slot].d5_gpio);
gpio_pullup_en(sdmmc_slot_info[slot].d6_gpio);
gpio_pullup_en(sdmmc_slot_info[slot].d7_gpio);
}
return ESP_OK;
}
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