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/*
* Qualcomm SDHCI driver - SD/eMMC controller
*
* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
*
* Based on Linux driver
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <sdhci.h>
#include <wait_bit.h>
#include <asm/io.h>
#include <linux/bitops.h>
/* Non-standard registers needed for SDHCI startup */
#define SDCC_MCI_POWER 0x0
#define SDCC_MCI_POWER_SW_RST BIT(7)
/* This is undocumented register */
#define SDCC_MCI_VERSION 0x50
#define SDCC_MCI_VERSION_MAJOR_SHIFT 28
#define SDCC_MCI_VERSION_MAJOR_MASK (0xf << SDCC_MCI_VERSION_MAJOR_SHIFT)
#define SDCC_MCI_VERSION_MINOR_MASK 0xff
#define SDCC_MCI_STATUS2 0x6C
#define SDCC_MCI_STATUS2_MCI_ACT 0x1
#define SDCC_MCI_HC_MODE 0x78
/* Offset to SDHCI registers */
#define SDCC_SDHCI_OFFSET 0x900
/* Non standard (?) SDHCI register */
#define SDHCI_VENDOR_SPEC_CAPABILITIES0 0x11c
struct msm_sdhc {
struct sdhci_host host;
void *base;
};
DECLARE_GLOBAL_DATA_PTR;
static int msm_sdc_clk_init(struct udevice *dev)
{
uint clk_rate = fdtdec_get_uint(gd->fdt_blob, dev->of_offset,
"clock-frequency", 400000);
uint clkd[2]; /* clk_id and clk_no */
int clk_offset;
struct udevice *clk_dev;
struct clk clk;
int ret;
ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "clock", clkd,
2);
if (ret)
return ret;
clk_offset = fdt_node_offset_by_phandle(gd->fdt_blob, clkd[0]);
if (clk_offset < 0)
return clk_offset;
ret = uclass_get_device_by_of_offset(UCLASS_CLK, clk_offset, &clk_dev);
if (ret)
return ret;
clk.id = clkd[1];
ret = clk_request(clk_dev, &clk);
if (ret < 0)
return ret;
ret = clk_set_rate(&clk, clk_rate);
clk_free(&clk);
if (ret < 0)
return ret;
return 0;
}
static int msm_sdc_probe(struct udevice *dev)
{
struct msm_sdhc *prv = dev_get_priv(dev);
struct sdhci_host *host = &prv->host;
u32 core_version, core_minor, core_major;
int ret;
host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_BROKEN_R1B;
/* Init clocks */
ret = msm_sdc_clk_init(dev);
if (ret)
return ret;
/* Reset the core and Enable SDHC mode */
writel(readl(prv->base + SDCC_MCI_POWER) | SDCC_MCI_POWER_SW_RST,
prv->base + SDCC_MCI_POWER);
/* Wait for reset to be written to register */
if (wait_for_bit(__func__, prv->base + SDCC_MCI_STATUS2,
SDCC_MCI_STATUS2_MCI_ACT, false, 10, false)) {
printf("msm_sdhci: reset request failed\n");
return -EIO;
}
/* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
if (wait_for_bit(__func__, prv->base + SDCC_MCI_POWER,
SDCC_MCI_POWER_SW_RST, false, 2, false)) {
printf("msm_sdhci: stuck in reset\n");
return -ETIMEDOUT;
}
/* Enable host-controller mode */
writel(1, prv->base + SDCC_MCI_HC_MODE);
core_version = readl(prv->base + SDCC_MCI_VERSION);
core_major = (core_version & SDCC_MCI_VERSION_MAJOR_MASK);
core_major >>= SDCC_MCI_VERSION_MAJOR_SHIFT;
core_minor = core_version & SDCC_MCI_VERSION_MINOR_MASK;
/*
* Support for some capabilities is not advertised by newer
* controller versions and must be explicitly enabled.
*/
if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) {
u32 caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
caps |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT;
writel(caps, host->ioaddr + SDHCI_VENDOR_SPEC_CAPABILITIES0);
}
/* Set host controller version */
host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
/* automatically detect max and min speed */
return add_sdhci(host, 0, 0);
}
static int msm_sdc_remove(struct udevice *dev)
{
struct msm_sdhc *priv = dev_get_priv(dev);
/* Disable host-controller mode */
writel(0, priv->base + SDCC_MCI_HC_MODE);
return 0;
}
static int msm_ofdata_to_platdata(struct udevice *dev)
{
struct udevice *parent = dev->parent;
struct msm_sdhc *priv = dev_get_priv(dev);
struct sdhci_host *host = &priv->host;
host->name = strdup(dev->name);
host->ioaddr = (void *)dev_get_addr(dev);
host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
"bus-width", 4);
host->index = fdtdec_get_uint(gd->fdt_blob, dev->of_offset, "index", 0);
priv->base = (void *)fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
parent->of_offset,
dev->of_offset,
"reg", 1, NULL);
if (priv->base == (void *)FDT_ADDR_T_NONE ||
host->ioaddr == (void *)FDT_ADDR_T_NONE)
return -EINVAL;
return 0;
}
static const struct udevice_id msm_mmc_ids[] = {
{ .compatible = "qcom,sdhci-msm-v4" },
{ }
};
U_BOOT_DRIVER(msm_sdc_drv) = {
.name = "msm_sdc",
.id = UCLASS_MMC,
.of_match = msm_mmc_ids,
.ofdata_to_platdata = msm_ofdata_to_platdata,
.probe = msm_sdc_probe,
.remove = msm_sdc_remove,
.priv_auto_alloc_size = sizeof(struct msm_sdhc),
};
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