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/*
* (C) Copyright 2012 SAMSUNG Electronics
* Jaehoon Chung <jh80.chung@samsung.com>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <common.h>
#include <dwmmc.h>
#include <fdtdec.h>
#include <libfdt.h>
#include <malloc.h>
#include <asm/arch/dwmmc.h>
#include <asm/arch/clk.h>
#include <asm/arch/pinmux.h>
#define DWMMC_MAX_CH_NUM 4
#define DWMMC_MAX_FREQ 52000000
#define DWMMC_MIN_FREQ 400000
#define DWMMC_MMC0_CLKSEL_VAL 0x03030001
#define DWMMC_MMC2_CLKSEL_VAL 0x03020001
/*
* Function used as callback function to initialise the
* CLKSEL register for every mmc channel.
*/
static void exynos_dwmci_clksel(struct dwmci_host *host)
{
dwmci_writel(host, DWMCI_CLKSEL, host->clksel_val);
}
unsigned int exynos_dwmci_get_clk(int dev_index)
{
return get_mmc_clk(dev_index);
}
/*
* This function adds the mmc channel to be registered with mmc core.
* index - mmc channel number.
* regbase - register base address of mmc channel specified in 'index'.
* bus_width - operating bus width of mmc channel specified in 'index'.
* clksel - value to be written into CLKSEL register in case of FDT.
* NULL in case od non-FDT.
*/
int exynos_dwmci_add_port(int index, u32 regbase, int bus_width, u32 clksel)
{
struct dwmci_host *host = NULL;
unsigned int div;
unsigned long freq, sclk;
host = malloc(sizeof(struct dwmci_host));
if (!host) {
printf("dwmci_host malloc fail!\n");
return 1;
}
/* request mmc clock vlaue of 52MHz. */
freq = 52000000;
sclk = get_mmc_clk(index);
div = DIV_ROUND_UP(sclk, freq);
/* set the clock divisor for mmc */
set_mmc_clk(index, div);
host->name = "EXYNOS DWMMC";
host->ioaddr = (void *)regbase;
host->buswidth = bus_width;
if (clksel) {
host->clksel_val = clksel;
} else {
if (0 == index)
host->clksel_val = DWMMC_MMC0_CLKSEL_VAL;
if (2 == index)
host->clksel_val = DWMMC_MMC2_CLKSEL_VAL;
}
host->clksel = exynos_dwmci_clksel;
host->dev_index = index;
host->mmc_clk = exynos_dwmci_get_clk;
/* Add the mmc channel to be registered with mmc core */
if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
debug("dwmmc%d registration failed\n", index);
return -1;
}
return 0;
}
#ifdef CONFIG_OF_CONTROL
int exynos_dwmmc_init(const void *blob)
{
int index, bus_width;
int node_list[DWMMC_MAX_CH_NUM];
int err = 0, dev_id, flag, count, i;
u32 clksel_val, base, timing[3];
count = fdtdec_find_aliases_for_id(blob, "mmc",
COMPAT_SAMSUNG_EXYNOS5_DWMMC, node_list,
DWMMC_MAX_CH_NUM);
for (i = 0; i < count; i++) {
int node = node_list[i];
if (node <= 0)
continue;
/* Extract device id for each mmc channel */
dev_id = pinmux_decode_periph_id(blob, node);
/* Get the bus width from the device node */
bus_width = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
if (bus_width <= 0) {
debug("DWMMC: Can't get bus-width\n");
return -1;
}
if (8 == bus_width)
flag = PINMUX_FLAG_8BIT_MODE;
else
flag = PINMUX_FLAG_NONE;
/* config pinmux for each mmc channel */
err = exynos_pinmux_config(dev_id, flag);
if (err) {
debug("DWMMC not configured\n");
return err;
}
index = dev_id - PERIPH_ID_SDMMC0;
/* Get the base address from the device node */
base = fdtdec_get_addr(blob, node, "reg");
if (!base) {
debug("DWMMC: Can't get base address\n");
return -1;
}
/* Extract the timing info from the node */
err = fdtdec_get_int_array(blob, node, "samsung,timing",
timing, 3);
if (err) {
debug("Can't get sdr-timings for divider\n");
return -1;
}
clksel_val = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
DWMCI_SET_DRV_CLK(timing[1]) |
DWMCI_SET_DIV_RATIO(timing[2]));
/* Initialise each mmc channel */
err = exynos_dwmci_add_port(index, base, bus_width, clksel_val);
if (err)
debug("dwmmc Channel-%d init failed\n", index);
}
return 0;
}
#endif
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