2 * (C) Copyright 2012 SAMSUNG Electronics
3 * Jaehoon Chung <jh80.chung@samsung.com>
5 * SPDX-License-Identifier: GPL-2.0+
13 #include <asm/arch/dwmmc.h>
14 #include <asm/arch/clk.h>
15 #include <asm/arch/pinmux.h>
17 #define DWMMC_MAX_CH_NUM 4
18 #define DWMMC_MAX_FREQ 52000000
19 #define DWMMC_MIN_FREQ 400000
20 #define DWMMC_MMC0_CLKSEL_VAL 0x03030001
21 #define DWMMC_MMC2_CLKSEL_VAL 0x03020001
24 * Function used as callback function to initialise the
25 * CLKSEL register for every mmc channel.
27 static void exynos_dwmci_clksel(struct dwmci_host
*host
)
29 dwmci_writel(host
, DWMCI_CLKSEL
, host
->clksel_val
);
32 unsigned int exynos_dwmci_get_clk(struct dwmci_host
*host
)
38 * Since SDCLKIN is divided inside controller by the DIVRATIO
39 * value set in the CLKSEL register, we need to use the same output
40 * clock value to calculate the CLKDIV value.
41 * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)
43 clk_div
= ((dwmci_readl(host
, DWMCI_CLKSEL
) >> DWMCI_DIVRATIO_BIT
)
44 & DWMCI_DIVRATIO_MASK
) + 1;
45 sclk
= get_mmc_clk(host
->dev_index
);
47 return sclk
/ clk_div
;
50 static void exynos_dwmci_board_init(struct dwmci_host
*host
)
52 if (host
->quirks
& DWMCI_QUIRK_DISABLE_SMU
) {
53 dwmci_writel(host
, EMMCP_MPSBEGIN0
, 0);
54 dwmci_writel(host
, EMMCP_SEND0
, 0);
55 dwmci_writel(host
, EMMCP_CTRL0
,
56 MPSCTRL_SECURE_READ_BIT
|
57 MPSCTRL_SECURE_WRITE_BIT
|
58 MPSCTRL_NON_SECURE_READ_BIT
|
59 MPSCTRL_NON_SECURE_WRITE_BIT
| MPSCTRL_VALID
);
64 * This function adds the mmc channel to be registered with mmc core.
65 * index - mmc channel number.
66 * regbase - register base address of mmc channel specified in 'index'.
67 * bus_width - operating bus width of mmc channel specified in 'index'.
68 * clksel - value to be written into CLKSEL register in case of FDT.
69 * NULL in case od non-FDT.
71 int exynos_dwmci_add_port(int index
, u32 regbase
, int bus_width
, u32 clksel
)
73 struct dwmci_host
*host
= NULL
;
75 unsigned long freq
, sclk
;
76 host
= malloc(sizeof(struct dwmci_host
));
78 printf("dwmci_host malloc fail!\n");
81 /* request mmc clock vlaue of 52MHz. */
83 sclk
= get_mmc_clk(index
);
84 div
= DIV_ROUND_UP(sclk
, freq
);
85 /* set the clock divisor for mmc */
86 set_mmc_clk(index
, div
);
88 host
->name
= "EXYNOS DWMMC";
89 host
->ioaddr
= (void *)regbase
;
90 host
->buswidth
= bus_width
;
91 #ifdef CONFIG_EXYNOS5420
92 host
->quirks
= DWMCI_QUIRK_DISABLE_SMU
;
94 host
->board_init
= exynos_dwmci_board_init
;
97 host
->clksel_val
= clksel
;
100 host
->clksel_val
= DWMMC_MMC0_CLKSEL_VAL
;
102 host
->clksel_val
= DWMMC_MMC2_CLKSEL_VAL
;
105 host
->clksel
= exynos_dwmci_clksel
;
106 host
->dev_index
= index
;
107 host
->get_mmc_clk
= exynos_dwmci_get_clk
;
108 /* Add the mmc channel to be registered with mmc core */
109 if (add_dwmci(host
, DWMMC_MAX_FREQ
, DWMMC_MIN_FREQ
)) {
110 debug("dwmmc%d registration failed\n", index
);
116 #ifdef CONFIG_OF_CONTROL
117 int exynos_dwmmc_init(const void *blob
)
119 int index
, bus_width
;
120 int node_list
[DWMMC_MAX_CH_NUM
];
121 int err
= 0, dev_id
, flag
, count
, i
;
122 u32 clksel_val
, base
, timing
[3];
124 count
= fdtdec_find_aliases_for_id(blob
, "mmc",
125 COMPAT_SAMSUNG_EXYNOS5_DWMMC
, node_list
,
128 for (i
= 0; i
< count
; i
++) {
129 int node
= node_list
[i
];
134 /* Extract device id for each mmc channel */
135 dev_id
= pinmux_decode_periph_id(blob
, node
);
137 /* Get the bus width from the device node */
138 bus_width
= fdtdec_get_int(blob
, node
, "samsung,bus-width", 0);
139 if (bus_width
<= 0) {
140 debug("DWMMC: Can't get bus-width\n");
144 flag
= PINMUX_FLAG_8BIT_MODE
;
146 flag
= PINMUX_FLAG_NONE
;
148 /* config pinmux for each mmc channel */
149 err
= exynos_pinmux_config(dev_id
, flag
);
151 debug("DWMMC not configured\n");
155 index
= dev_id
- PERIPH_ID_SDMMC0
;
157 /* Get the base address from the device node */
158 base
= fdtdec_get_addr(blob
, node
, "reg");
160 debug("DWMMC: Can't get base address\n");
163 /* Extract the timing info from the node */
164 err
= fdtdec_get_int_array(blob
, node
, "samsung,timing",
167 debug("Can't get sdr-timings for divider\n");
171 clksel_val
= (DWMCI_SET_SAMPLE_CLK(timing
[0]) |
172 DWMCI_SET_DRV_CLK(timing
[1]) |
173 DWMCI_SET_DIV_RATIO(timing
[2]));
174 /* Initialise each mmc channel */
175 err
= exynos_dwmci_add_port(index
, base
, bus_width
, clksel_val
);
177 debug("dwmmc Channel-%d init failed\n", index
);