1 /* 2 * (C) Copyright 2012 SAMSUNG Electronics 3 * Jaehoon Chung <jh80.chung@samsung.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dwmmc.h> 10 #include <fdtdec.h> 11 #include <libfdt.h> 12 #include <malloc.h> 13 #include <asm/arch/dwmmc.h> 14 #include <asm/arch/clk.h> 15 #include <asm/arch/pinmux.h> 16 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 22 23 /* 24 * Function used as callback function to initialise the 25 * CLKSEL register for every mmc channel. 26 */ 27 static void exynos_dwmci_clksel(struct dwmci_host *host) 28 { 29 dwmci_writel(host, DWMCI_CLKSEL, host->clksel_val); 30 } 31 32 unsigned int exynos_dwmci_get_clk(int dev_index) 33 { 34 return get_mmc_clk(dev_index); 35 } 36 37 /* 38 * This function adds the mmc channel to be registered with mmc core. 39 * index - mmc channel number. 40 * regbase - register base address of mmc channel specified in 'index'. 41 * bus_width - operating bus width of mmc channel specified in 'index'. 42 * clksel - value to be written into CLKSEL register in case of FDT. 43 * NULL in case od non-FDT. 44 */ 45 int exynos_dwmci_add_port(int index, u32 regbase, int bus_width, u32 clksel) 46 { 47 struct dwmci_host *host = NULL; 48 unsigned int div; 49 unsigned long freq, sclk; 50 host = malloc(sizeof(struct dwmci_host)); 51 if (!host) { 52 printf("dwmci_host malloc fail!\n"); 53 return 1; 54 } 55 /* request mmc clock vlaue of 52MHz. */ 56 freq = 52000000; 57 sclk = get_mmc_clk(index); 58 div = DIV_ROUND_UP(sclk, freq); 59 /* set the clock divisor for mmc */ 60 set_mmc_clk(index, div); 61 62 host->name = "EXYNOS DWMMC"; 63 host->ioaddr = (void *)regbase; 64 host->buswidth = bus_width; 65 #ifdef CONFIG_EXYNOS5420 66 host->quirks = DWMCI_QUIRK_DISABLE_SMU; 67 #endif 68 69 if (clksel) { 70 host->clksel_val = clksel; 71 } else { 72 if (0 == index) 73 host->clksel_val = DWMMC_MMC0_CLKSEL_VAL; 74 if (2 == index) 75 host->clksel_val = DWMMC_MMC2_CLKSEL_VAL; 76 } 77 78 host->clksel = exynos_dwmci_clksel; 79 host->dev_index = index; 80 host->get_mmc_clk = exynos_dwmci_get_clk; 81 /* Add the mmc channel to be registered with mmc core */ 82 if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) { 83 debug("dwmmc%d registration failed\n", index); 84 return -1; 85 } 86 return 0; 87 } 88 89 #ifdef CONFIG_OF_CONTROL 90 int exynos_dwmmc_init(const void *blob) 91 { 92 int index, bus_width; 93 int node_list[DWMMC_MAX_CH_NUM]; 94 int err = 0, dev_id, flag, count, i; 95 u32 clksel_val, base, timing[3]; 96 97 count = fdtdec_find_aliases_for_id(blob, "mmc", 98 COMPAT_SAMSUNG_EXYNOS5_DWMMC, node_list, 99 DWMMC_MAX_CH_NUM); 100 101 for (i = 0; i < count; i++) { 102 int node = node_list[i]; 103 104 if (node <= 0) 105 continue; 106 107 /* Extract device id for each mmc channel */ 108 dev_id = pinmux_decode_periph_id(blob, node); 109 110 /* Get the bus width from the device node */ 111 bus_width = fdtdec_get_int(blob, node, "samsung,bus-width", 0); 112 if (bus_width <= 0) { 113 debug("DWMMC: Can't get bus-width\n"); 114 return -1; 115 } 116 if (8 == bus_width) 117 flag = PINMUX_FLAG_8BIT_MODE; 118 else 119 flag = PINMUX_FLAG_NONE; 120 121 /* config pinmux for each mmc channel */ 122 err = exynos_pinmux_config(dev_id, flag); 123 if (err) { 124 debug("DWMMC not configured\n"); 125 return err; 126 } 127 128 index = dev_id - PERIPH_ID_SDMMC0; 129 130 /* Get the base address from the device node */ 131 base = fdtdec_get_addr(blob, node, "reg"); 132 if (!base) { 133 debug("DWMMC: Can't get base address\n"); 134 return -1; 135 } 136 /* Extract the timing info from the node */ 137 err = fdtdec_get_int_array(blob, node, "samsung,timing", 138 timing, 3); 139 if (err) { 140 debug("Can't get sdr-timings for divider\n"); 141 return -1; 142 } 143 144 clksel_val = (DWMCI_SET_SAMPLE_CLK(timing[0]) | 145 DWMCI_SET_DRV_CLK(timing[1]) | 146 DWMCI_SET_DIV_RATIO(timing[2])); 147 /* Initialise each mmc channel */ 148 err = exynos_dwmci_add_port(index, base, bus_width, clksel_val); 149 if (err) 150 debug("dwmmc Channel-%d init failed\n", index); 151 } 152 return 0; 153 } 154 #endif 155