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// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: 2011 Hubert Feurstein <h.feurstein@gmail.com>
// SPDX-FileCopyrightText: 2009 Ilya Yanok <yanok@emcraft.com>
// SPDX-FileCopyrightText: 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
// SPDX-FileCopyrightText: 2006 Pavel Pisa <ppisa@pikron.com>, PiKRON
/* Atmel MCI driver */
#include <common.h>
#include <gpio.h>
#include <linux/clk.h>
#include <mci.h>
#include <of_gpio.h>
#include <platform_data/atmel-mci.h>
#include "atmel-mci-regs.h"
/** change host interface settings */
static void atmci_set_ios(struct mci_host *mci, struct mci_ios *ios)
{
struct atmel_mci *host = to_mci_host(mci);
atmci_common_set_ios(host, ios);
}
static int atmci_send_cmd(struct mci_host *mci, struct mci_cmd *cmd,
struct mci_data *data)
{
struct atmel_mci *host = to_mci_host(mci);
return atmci_common_request(host, cmd, data);
}
static void atmci_info(struct device_d *mci_dev)
{
struct atmel_mci *host = mci_dev->priv;
printf(" Bus data width: %d bit\n", host->mci.bus_width);
printf(" Bus frequency: %u Hz\n", host->mci.clock);
printf(" Frequency limits: ");
if (host->mci.f_min == 0)
printf("no lower limit ");
else
printf("%u Hz lower limit ", host->mci.f_min);
if (host->mci.f_max == 0)
printf("- no upper limit");
else
printf("- %u Hz upper limit", host->mci.f_max);
printf("\n Card detection support: %s\n",
gpio_is_valid(host->detect_pin) ? "yes" : "no");
}
static int atmci_card_present(struct mci_host *mci)
{
struct atmel_mci *host = to_mci_host(mci);
int ret;
/* No gpio, assume card is present */
if (!gpio_is_valid(host->detect_pin))
return 1;
ret = gpio_get_value(host->detect_pin);
return ret == 0 ? 1 : 0;
}
static int atmci_probe(struct device_d *hw_dev)
{
struct resource *iores;
struct atmel_mci *host;
struct device_node *np = hw_dev->device_node;
struct atmel_mci_platform_data *pd = hw_dev->platform_data;
int ret;
host = xzalloc(sizeof(*host));
host->mci.send_cmd = atmci_send_cmd;
host->mci.set_ios = atmci_set_ios;
host->mci.init = atmci_reset;
host->mci.card_present = atmci_card_present;
host->mci.hw_dev = hw_dev;
host->detect_pin = -EINVAL;
if (pd) {
host->detect_pin = pd->detect_pin;
host->mci.devname = pd->devname;
if (pd->bus_width >= 4)
host->mci.host_caps |= MMC_CAP_4_BIT_DATA;
if (pd->bus_width == 8)
host->mci.host_caps |= MMC_CAP_8_BIT_DATA;
host->slot_b = pd->slot_b;
} else if (np) {
u32 slot_id;
struct device_node *cnp;
const char *alias = of_alias_get(np);
if (alias)
host->mci.devname = xstrdup(alias);
host->detect_pin = of_get_named_gpio(np, "cd-gpios", 0);
for_each_child_of_node(np, cnp) {
if (of_property_read_u32(cnp, "reg", &slot_id)) {
dev_warn(hw_dev, "reg property is missing for %s\n",
cnp->full_name);
continue;
}
host->slot_b = slot_id;
mci_of_parse_node(&host->mci, cnp);
break;
}
} else {
dev_err(hw_dev, "Missing device information\n");
ret = -EINVAL;
goto error_out;
}
if (gpio_is_valid(host->detect_pin)) {
ret = gpio_request(host->detect_pin, "mci_cd");
if (ret) {
dev_err(hw_dev, "Impossible to request CD gpio %d (%d)\n",
ret, host->detect_pin);
goto error_out;
}
ret = gpio_direction_input(host->detect_pin);
if (ret) {
dev_err(hw_dev, "Impossible to configure CD gpio %d as input (%d)\n",
ret, host->detect_pin);
goto error_out;
}
}
iores = dev_request_mem_resource(hw_dev, 0);
if (IS_ERR(iores))
return PTR_ERR(iores);
host->regs = IOMEM(iores->start);
host->hw_dev = hw_dev;
hw_dev->priv = host;
host->clk = clk_get(hw_dev, "mci_clk");
if (IS_ERR(host->clk)) {
dev_err(hw_dev, "no mci_clk\n");
ret = PTR_ERR(host->clk);
goto error_out;
}
clk_enable(host->clk);
atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
atmci_writel(host, ATMCI_IDR, ~0UL);
host->bus_hz = clk_get_rate(host->clk);
clk_disable(host->clk);
host->mci.voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
host->mci.f_min = DIV_ROUND_UP(host->bus_hz, 512);
host->mci.f_max = host->bus_hz >> 1;
atmci_get_cap(host);
if (host->caps.has_highspeed)
host->mci.host_caps |= MMC_CAP_SD_HIGHSPEED;
if (host->slot_b)
host->sdc_reg = ATMCI_SDCSEL_SLOT_B;
else
host->sdc_reg = ATMCI_SDCSEL_SLOT_A;
if (IS_ENABLED(CONFIG_MCI_INFO))
hw_dev->info = atmci_info;
mci_register(&host->mci);
return 0;
error_out:
free(host);
if (gpio_is_valid(host->detect_pin))
gpio_free(host->detect_pin);
return ret;
}
static __maybe_unused struct of_device_id atmci_compatible[] = {
{
.compatible = "atmel,hsmci",
}, {
/* sentinel */
}
};
static struct driver_d atmci_driver = {
.name = "atmel_mci",
.probe = atmci_probe,
.of_compatible = DRV_OF_COMPAT(atmci_compatible),
};
device_platform_driver(atmci_driver);
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