1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Secure Digital (SD) Host Controller interface specific code
4 */
5
6 #include <commonlib/sd_mmc_ctrlr.h>
7 #include <commonlib/sdhci.h>
8 #include <commonlib/storage.h>
9 #include "sdhci.h"
10 #include "sd_mmc.h"
11 #include "storage.h"
12
sdhci_display_bus_width(struct sdhci_ctrlr * sdhci_ctrlr)13 static void sdhci_display_bus_width(struct sdhci_ctrlr *sdhci_ctrlr)
14 {
15 if (CONFIG(SDHC_DEBUG)) {
16 int bits;
17 uint8_t host_ctrl;
18 uint16_t host2;
19 const char *rate;
20 uint16_t timing;
21
22 /* Display the bus width */
23 host_ctrl = sdhci_readb(sdhci_ctrlr, SDHCI_HOST_CONTROL);
24 host2 = sdhci_readw(sdhci_ctrlr, SDHCI_HOST_CONTROL2);
25 timing = host2 & SDHCI_CTRL_UHS_MASK;
26 bits = 1;
27 if (host_ctrl & SDHCI_CTRL_8BITBUS)
28 bits = 8;
29 else if (host_ctrl & SDHCI_CTRL_4BITBUS)
30 bits = 4;
31 rate = "SDR";
32 if ((timing == SDHCI_CTRL_UHS_DDR50)
33 || (timing == SDHCI_CTRL_HS400))
34 rate = "DDR";
35 sdhc_debug("SDHCI bus width: %d bit%s %s\n", bits,
36 (bits != 1) ? "s" : "", rate);
37 }
38 }
39
sdhci_display_clock(struct sdhci_ctrlr * sdhci_ctrlr)40 static void sdhci_display_clock(struct sdhci_ctrlr *sdhci_ctrlr)
41 {
42 if (CONFIG(SDHC_DEBUG)) {
43 uint16_t clk_ctrl;
44 uint32_t clock;
45 uint32_t divisor;
46
47 /* Display the clock */
48 clk_ctrl = sdhci_readw(sdhci_ctrlr, SDHCI_CLOCK_CONTROL);
49 sdhc_debug("SDHCI bus clock: ");
50 if (clk_ctrl & SDHCI_CLOCK_CARD_EN) {
51 divisor = (clk_ctrl >> SDHCI_DIVIDER_SHIFT)
52 & SDHCI_DIV_MASK;
53 divisor |= ((clk_ctrl >> SDHCI_DIVIDER_SHIFT)
54 << SDHCI_DIV_MASK_LEN) & SDHCI_DIV_HI_MASK;
55 divisor <<= 1;
56 clock = sdhci_ctrlr->sd_mmc_ctrlr.clock_base;
57 if (divisor)
58 clock /= divisor;
59 sdhc_debug("%d.%03d MHz\n", clock / 1000000,
60 (clock / 1000) % 1000);
61 } else
62 sdhc_debug("Off\n");
63 }
64 }
65
sdhci_display_voltage(struct sdhci_ctrlr * sdhci_ctrlr)66 static void sdhci_display_voltage(struct sdhci_ctrlr *sdhci_ctrlr)
67 {
68 if (CONFIG(SDHC_DEBUG)) {
69 u8 pwr_ctrl;
70 const char *voltage;
71 const char *voltage_table[8] = {
72 "Unknown", /* 0 */
73 "Unknown", /* 1 */
74 "Unknown", /* 2 */
75 "Unknown", /* 3 */
76 "Unknown", /* 4 */
77 "1.8", /* 5 */
78 "3.0", /* 6 */
79 "3.3", /* 7 */
80 };
81
82 pwr_ctrl = sdhci_readb(sdhci_ctrlr, SDHCI_POWER_CONTROL);
83 if (pwr_ctrl & SDHCI_POWER_ON) {
84 voltage = voltage_table[(pwr_ctrl & SDHCI_POWER_330)
85 >> 1];
86 sdhc_debug("SDHCI voltage: %s Volts\n", voltage);
87 } else
88 sdhc_debug("SDHCI voltage: Off\n");
89 }
90 }
91
sdhci_display_setup(struct sdhci_ctrlr * sdhci_ctrlr)92 void sdhci_display_setup(struct sdhci_ctrlr *sdhci_ctrlr)
93 {
94 /* Display the controller setup */
95 sdhci_display_voltage(sdhci_ctrlr);
96 sdhci_display_clock(sdhci_ctrlr);
97 sdhci_display_bus_width(sdhci_ctrlr);
98 }
99