kona_sdhci.c
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/*
* Copyright 2013 Broadcom Corporation.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <malloc.h>
#include <sdhci.h>
#include <linux/errno.h>
#include <asm/kona-common/clk.h>
#define SDHCI_CORECTRL_OFFSET 0x00008000
#define SDHCI_CORECTRL_EN 0x01
#define SDHCI_CORECTRL_RESET 0x02
#define SDHCI_CORESTAT_OFFSET 0x00008004
#define SDHCI_CORESTAT_CD_SW 0x01
#define SDHCI_COREIMR_OFFSET 0x00008008
#define SDHCI_COREIMR_IP 0x01
static int init_kona_mmc_core(struct sdhci_host *host)
{
unsigned int mask;
unsigned int timeout;
if (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & SDHCI_RESET_ALL) {
printf("%s: sd host controller reset error\n", __func__);
return -EBUSY;
}
/* For kona a hardware reset before anything else. */
mask = sdhci_readl(host, SDHCI_CORECTRL_OFFSET) | SDHCI_CORECTRL_RESET;
sdhci_writel(host, mask, SDHCI_CORECTRL_OFFSET);
/* Wait max 100 ms */
timeout = 1000;
do {
if (timeout == 0) {
printf("%s: reset timeout error\n", __func__);
return -ETIMEDOUT;
}
timeout--;
udelay(100);
} while (0 ==
(sdhci_readl(host, SDHCI_CORECTRL_OFFSET) &
SDHCI_CORECTRL_RESET));
/* Clear the reset bit. */
mask = mask & ~SDHCI_CORECTRL_RESET;
sdhci_writel(host, mask, SDHCI_CORECTRL_OFFSET);
/* Enable AHB clock */
mask = sdhci_readl(host, SDHCI_CORECTRL_OFFSET);
sdhci_writel(host, mask | SDHCI_CORECTRL_EN, SDHCI_CORECTRL_OFFSET);
/* Enable interrupts */
sdhci_writel(host, SDHCI_COREIMR_IP, SDHCI_COREIMR_OFFSET);
/* Make sure Card is detected in controller */
mask = sdhci_readl(host, SDHCI_CORESTAT_OFFSET);
sdhci_writel(host, mask | SDHCI_CORESTAT_CD_SW, SDHCI_CORESTAT_OFFSET);
/* Wait max 100 ms */
timeout = 1000;
while (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
if (timeout == 0) {
printf("%s: CARD DETECT timeout error\n", __func__);
return -ETIMEDOUT;
}
timeout--;
udelay(100);
}
return 0;
}
int kona_sdhci_init(int dev_index, u32 min_clk, u32 quirks)
{
int ret = 0;
u32 max_clk;
void *reg_base;
struct sdhci_host *host = NULL;
host = (struct sdhci_host *)malloc(sizeof(struct sdhci_host));
if (!host) {
printf("%s: sdhci host malloc fail!\n", __func__);
return -ENOMEM;
}
switch (dev_index) {
case 0:
reg_base = (void *)CONFIG_SYS_SDIO_BASE0;
ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO0_MAX_CLK,
&max_clk);
break;
case 1:
reg_base = (void *)CONFIG_SYS_SDIO_BASE1;
ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO1_MAX_CLK,
&max_clk);
break;
case 2:
reg_base = (void *)CONFIG_SYS_SDIO_BASE2;
ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO2_MAX_CLK,
&max_clk);
break;
case 3:
reg_base = (void *)CONFIG_SYS_SDIO_BASE3;
ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO3_MAX_CLK,
&max_clk);
break;
default:
printf("%s: sdio dev index %d not supported\n",
__func__, dev_index);
ret = -EINVAL;
}
if (ret) {
free(host);
return ret;
}
host->name = "kona-sdhci";
host->ioaddr = reg_base;
host->quirks = quirks;
host->max_clk = max_clk;
if (init_kona_mmc_core(host)) {
free(host);
return -EINVAL;
}
add_sdhci(host, 0, min_clk);
return ret;
}