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/*
* Copyright 2011, Marvell Semiconductor Inc.
* Lei Wen <leiwen@marvell.com>
*
* Copyright 2017 Intel Corporation
*
* Secure Digital (SD) Host Controller interface specific code
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <commonlib/sd_mmc_ctrlr.h>
#include <commonlib/sdhci.h>
#include <commonlib/storage.h>
#include "sdhci.h"
#include "sd_mmc.h"
#include "storage.h"
static void sdhci_display_bus_width(struct sdhci_ctrlr *sdhci_ctrlr)
{
if (CONFIG(SDHC_DEBUG)) {
int bits;
uint8_t host_ctrl;
uint16_t host2;
const char *rate;
uint16_t timing;
/* Display the bus width */
host_ctrl = sdhci_readb(sdhci_ctrlr, SDHCI_HOST_CONTROL);
host2 = sdhci_readw(sdhci_ctrlr, SDHCI_HOST_CONTROL2);
timing = host2 & SDHCI_CTRL_UHS_MASK;
bits = 1;
if (host_ctrl & SDHCI_CTRL_8BITBUS)
bits = 8;
else if (host_ctrl & SDHCI_CTRL_4BITBUS)
bits = 4;
rate = "SDR";
if ((timing == SDHCI_CTRL_UHS_DDR50)
|| (timing == SDHCI_CTRL_HS400))
rate = "DDR";
sdhc_debug("SDHCI bus width: %d bit%s %s\n", bits,
(bits != 1) ? "s" : "", rate);
}
}
static void sdhci_display_clock(struct sdhci_ctrlr *sdhci_ctrlr)
{
if (CONFIG(SDHC_DEBUG)) {
uint16_t clk_ctrl;
uint32_t clock;
uint32_t divisor;
/* Display the clock */
clk_ctrl = sdhci_readw(sdhci_ctrlr, SDHCI_CLOCK_CONTROL);
sdhc_debug("SDHCI bus clock: ");
if (clk_ctrl & SDHCI_CLOCK_CARD_EN) {
divisor = (clk_ctrl >> SDHCI_DIVIDER_SHIFT)
& SDHCI_DIV_MASK;
divisor |= ((clk_ctrl >> SDHCI_DIVIDER_SHIFT)
<< SDHCI_DIV_MASK_LEN) & SDHCI_DIV_HI_MASK;
divisor <<= 1;
clock = sdhci_ctrlr->sd_mmc_ctrlr.clock_base;
if (divisor)
clock /= divisor;
sdhc_debug("%d.%03d MHz\n", clock / 1000000,
(clock / 1000) % 1000);
} else
sdhc_debug("Off\n");
}
}
static void sdhci_display_voltage(struct sdhci_ctrlr *sdhci_ctrlr)
{
if (CONFIG(SDHC_DEBUG)) {
u8 pwr_ctrl;
const char *voltage;
const char *voltage_table[8] = {
"Unknown", /* 0 */
"Unknown", /* 1 */
"Unknown", /* 2 */
"Unknown", /* 3 */
"Unknown", /* 4 */
"1.8", /* 5 */
"3.0", /* 6 */
"3.3", /* 7 */
};
pwr_ctrl = sdhci_readb(sdhci_ctrlr, SDHCI_POWER_CONTROL);
if (pwr_ctrl & SDHCI_POWER_ON) {
voltage = voltage_table[(pwr_ctrl & SDHCI_POWER_330)
>> 1];
sdhc_debug("SDHCI voltage: %s Volts\n", voltage);
} else
sdhc_debug("SDHCI voltage: Off\n");
}
}
void sdhci_display_setup(struct sdhci_ctrlr *sdhci_ctrlr)
{
/* Display the controller setup */
sdhci_display_voltage(sdhci_ctrlr);
sdhci_display_clock(sdhci_ctrlr);
sdhci_display_bus_width(sdhci_ctrlr);
}
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