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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2015 Samsung Electronics
- * Przemyslaw Marczak <p.marczak@samsung.com>
- */
- #include <common.h>
- #include <adc.h>
- #include <dm.h>
- #include <errno.h>
- #include <fdtdec.h>
- #include <linux/delay.h>
- #include <power/pmic.h>
- #include <power/regulator.h>
- #include <power/s2mps11.h>
- #include <samsung/exynos5-dt-types.h>
- #include <samsung/misc.h>
- DECLARE_GLOBAL_DATA_PTR;
- static const struct udevice_id board_ids[] = {
- { .compatible = "samsung,odroidxu3", .data = EXYNOS5_BOARD_ODROID_XU3 },
- { .compatible = "samsung,exynos5", .data = EXYNOS5_BOARD_GENERIC },
- { },
- };
- /**
- * Odroix XU3/XU4/HC1/HC2 board revisions (from HC1+_HC2_MAIN_REV0.1_20171017.pdf):
- * Rev ADCmax Board
- * 0.1 0 XU3 0.1
- * 0.2 372 XU3 0.2 | XU3L - no DISPLAYPORT (probe I2C0:0x40 / INA231)
- * 0.3 1280 XU4 0.1
- * 0.4 739 XU4 0.2
- * 0.5 1016 XU4+Air0.1 (Passive cooling)
- * 0.6 1309 XU4-HC1 0.1
- * 0.7 1470 XU4-HC1+ 0.1 (HC2)
- * Use +1% for ADC value tolerance in the array below, the code loops until
- * the measured ADC value is lower than then ADCmax from the array.
- */
- struct odroid_rev_info odroid_info[] = {
- { EXYNOS5_BOARD_ODROID_XU3_REV01, 1, 10, "xu3" },
- { EXYNOS5_BOARD_ODROID_XU3_REV02, 2, 375, "xu3" },
- { EXYNOS5_BOARD_ODROID_XU4_REV01, 1, 1293, "xu4" },
- { EXYNOS5_BOARD_ODROID_HC1_REV01, 1, 1322, "hc1" },
- { EXYNOS5_BOARD_ODROID_HC2_REV01, 1, 1484, "hc1" },
- { EXYNOS5_BOARD_ODROID_UNKNOWN, 0, 4095, "unknown" },
- };
- static unsigned int odroid_get_rev(void)
- {
- int i;
- for (i = 0; i < ARRAY_SIZE(odroid_info); i++) {
- if (odroid_info[i].board_type == gd->board_type)
- return odroid_info[i].board_rev;
- }
- return 0;
- }
- /*
- * Read ADC at least twice and check the resuls. If regulator providing voltage
- * on to measured point was just turned on, first reads might require time
- * to stabilize.
- */
- static int odroid_get_adc_val(unsigned int *adcval)
- {
- unsigned int adcval_prev = 0;
- int ret, retries = 20;
- ret = adc_channel_single_shot("adc@12D10000", CONFIG_ODROID_REV_AIN,
- &adcval_prev);
- if (ret)
- return ret;
- while (retries--) {
- mdelay(5);
- ret = adc_channel_single_shot("adc@12D10000",
- CONFIG_ODROID_REV_AIN, adcval);
- if (ret)
- return ret;
- /*
- * If difference between ADC reads is less than 3%,
- * accept the result
- */
- if ((100 * abs(*adcval - adcval_prev) / adcval_prev) < 3)
- return ret;
- adcval_prev = *adcval;
- }
- return ret;
- }
- static int odroid_get_board_type(void)
- {
- unsigned int adcval;
- int ret, i;
- ret = odroid_get_adc_val(&adcval);
- if (ret)
- goto rev_default;
- for (i = 0; i < ARRAY_SIZE(odroid_info); i++) {
- /* ADC tolerance: +1% */
- if (adcval < odroid_info[i].adc_val)
- return odroid_info[i].board_type;
- }
- rev_default:
- return EXYNOS5_BOARD_ODROID_XU3;
- }
- /**
- * odroid_get_type_str - returns pointer to one of the board type string.
- * Board types: "xu3", "xu3-lite", "xu4". However the "xu3lite" can be
- * detected only when the i2c controller is ready to use. Fortunately,
- * XU3 and XU3L are compatible, and the information about board lite
- * revision is needed before booting the linux, to set proper environment
- * variable: $fdtfile.
- */
- static const char *odroid_get_type_str(void)
- {
- const char *type_xu3l = "xu3-lite";
- struct udevice *dev, *chip;
- int i, ret;
- if (gd->board_type != EXYNOS5_BOARD_ODROID_XU3_REV02)
- goto exit;
- ret = pmic_get("s2mps11_pmic@66", &dev);
- if (ret)
- goto exit;
- /* Enable LDO26: 3.0V */
- ret = pmic_reg_write(dev, S2MPS11_REG_L26CTRL,
- S2MPS11_LDO26_ENABLE);
- if (ret)
- goto exit;
- /* Check XU3Lite by probe INA231 I2C0:0x40 */
- ret = uclass_get_device(UCLASS_I2C, 0, &dev);
- if (ret)
- goto exit;
- ret = dm_i2c_probe(dev, 0x40, 0x0, &chip);
- if (ret)
- return type_xu3l;
- exit:
- for (i = 0; i < ARRAY_SIZE(odroid_info); i++) {
- if (odroid_info[i].board_type == gd->board_type)
- return odroid_info[i].name;
- }
- return NULL;
- }
- bool board_is_odroidxu3(void)
- {
- if (gd->board_type >= EXYNOS5_BOARD_ODROID_XU3 &&
- gd->board_type <= EXYNOS5_BOARD_ODROID_XU3_REV02)
- return true;
- return false;
- }
- bool board_is_odroidxu4(void)
- {
- if (gd->board_type == EXYNOS5_BOARD_ODROID_XU4_REV01)
- return true;
- return false;
- }
- bool board_is_odroidhc1(void)
- {
- if (gd->board_type == EXYNOS5_BOARD_ODROID_HC1_REV01)
- return true;
- return false;
- }
- bool board_is_odroidhc2(void)
- {
- if (gd->board_type == EXYNOS5_BOARD_ODROID_HC2_REV01)
- return true;
- return false;
- }
- bool board_is_generic(void)
- {
- if (gd->board_type == EXYNOS5_BOARD_GENERIC)
- return true;
- return false;
- }
- /**
- * get_board_rev() - return detected board revision.
- *
- * @return: return board revision number for XU3 or 0 for generic
- */
- u32 get_board_rev(void)
- {
- if (board_is_generic())
- return 0;
- return odroid_get_rev();
- }
- /**
- * get_board_type() - returns board type string.
- *
- * @return: return board type string for XU3 or empty string for generic
- */
- const char *get_board_type(void)
- {
- const char *generic = "";
- if (board_is_generic())
- return generic;
- return odroid_get_type_str();
- }
- /**
- * set_board_type() - set board type in gd->board_type.
- * As default type set EXYNOS5_BOARD_GENERIC. If Odroid is detected,
- * set its proper type based on device tree.
- *
- * This might be called early when some more specific ways to detect revision
- * are not yet available.
- */
- void set_board_type(void)
- {
- const struct udevice_id *of_match = board_ids;
- int ret;
- gd->board_type = EXYNOS5_BOARD_GENERIC;
- while (of_match->compatible) {
- ret = fdt_node_check_compatible(gd->fdt_blob, 0,
- of_match->compatible);
- if (ret)
- of_match++;
- gd->board_type = of_match->data;
- break;
- }
- }
- /**
- * set_board_revision() - set detailed board type in gd->board_type.
- * Should be called when resources (e.g. regulators) are available
- * so ADC can be used to detect the specific revision of a board.
- */
- void set_board_revision(void)
- {
- if (board_is_odroidxu3())
- gd->board_type = odroid_get_board_type();
- }
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