projects / thirdparty / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| c2dfd0a4 VR |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // | |
| a94a4071 | 3 | // Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/ |
| c2dfd0a4 VR |
4 | // Author: Vignesh Raghavendra <vigneshr@ti.com> |
| 5 | ||
| d678a59d | 6 | #include <common.h> |
| c2dfd0a4 VR |
7 | #include <asm/io.h> |
| 8 | #include <dm.h> | |
| 9 | #include <regmap.h> | |
| 10 | #include <syscon.h> | |
| 336d4615 | 11 | #include <dm/device_compat.h> |
| c2dfd0a4 VR |
12 | |
| 13 | #define FSS_SYSC_REG 0x4 | |
| 14 | ||
| 15 | #define HYPERBUS_CALIB_COUNT 25 | |
| 16 | ||
| 17 | struct am654_hbmc_priv { | |
| 18 | void __iomem *mmiobase; | |
| 19 | bool calibrated; | |
| 20 | }; | |
| 21 | ||
| 22 | /* Calibrate by looking for "QRY" string within the CFI space */ | |
| 23 | static int am654_hyperbus_calibrate(struct udevice *dev) | |
| 24 | { | |
| 25 | struct am654_hbmc_priv *priv = dev_get_priv(dev); | |
| 26 | int count = HYPERBUS_CALIB_COUNT; | |
| 27 | int pass_count = 0; | |
| 28 | u16 qry[3]; | |
| 29 | ||
| 30 | if (priv->calibrated) | |
| 31 | return 0; | |
| 32 | ||
| 33 | writew(0xF0, priv->mmiobase); | |
| 34 | writew(0x98, priv->mmiobase + 0xaa); | |
| 35 | ||
| 36 | while (count--) { | |
| 37 | qry[0] = readw(priv->mmiobase + 0x20); | |
| 38 | qry[1] = readw(priv->mmiobase + 0x22); | |
| 39 | qry[2] = readw(priv->mmiobase + 0x24); | |
| 40 | ||
| 41 | if (qry[0] == 'Q' && qry[1] == 'R' && qry[2] == 'Y') | |
| 42 | pass_count++; | |
| 43 | else | |
| 44 | pass_count = 0; | |
| 45 | if (pass_count == 5) | |
| 46 | break; | |
| 47 | } | |
| 48 | writew(0xF0, priv->mmiobase); | |
| 49 | writew(0xFF, priv->mmiobase); | |
| 50 | ||
| 51 | return pass_count == 5; | |
| 52 | } | |
| 53 | ||
| 54 | static int am654_select_hbmc(struct udevice *dev) | |
| 55 | { | |
| 56 | struct regmap *regmap = syscon_get_regmap(dev_get_parent(dev)); | |
| 57 | ||
| 58 | return regmap_update_bits(regmap, FSS_SYSC_REG, 0x2, 0x2); | |
| 59 | } | |
| 60 | ||
| 61 | static int am654_hbmc_bind(struct udevice *dev) | |
| 62 | { | |
| 63 | return dm_scan_fdt_dev(dev); | |
| 64 | } | |
| 65 | ||
| 66 | static int am654_hbmc_probe(struct udevice *dev) | |
| 67 | { | |
| 68 | struct am654_hbmc_priv *priv = dev_get_priv(dev); | |
| 69 | int ret; | |
| 70 | ||
| 71 | priv->mmiobase = devfdt_remap_addr_index(dev, 1); | |
| 72 | if (dev_read_bool(dev, "mux-controls")) { | |
| 73 | ret = am654_select_hbmc(dev); | |
| 74 | if (ret) { | |
| 75 | dev_err(dev, "Failed to select HBMC mux\n"); | |
| 76 | return ret; | |
| 77 | } | |
| 78 | } | |
| 79 | ||
| 80 | if (!priv->calibrated) { | |
| 81 | ret = am654_hyperbus_calibrate(dev); | |
| 82 | if (!ret) { | |
| 83 | dev_err(dev, "Calibration Failed\n"); | |
| 84 | return -EIO; | |
| 85 | } | |
| 86 | } | |
| 87 | priv->calibrated = true; | |
| 88 | ||
| 89 | return 0; | |
| 90 | } | |
| 91 | ||
| 92 | static const struct udevice_id am654_hbmc_dt_ids[] = { | |
| 93 | { | |
| 94 | .compatible = "ti,am654-hbmc", | |
| 95 | }, | |
| 96 | { /* end of table */ } | |
| 97 | }; | |
| 98 | ||
| 99 | U_BOOT_DRIVER(hbmc_am654) = { | |
| 100 | .name = "hbmc-am654", | |
| 101 | .id = UCLASS_MTD, | |
| 102 | .of_match = am654_hbmc_dt_ids, | |
| 103 | .probe = am654_hbmc_probe, | |
| 104 | .bind = am654_hbmc_bind, | |
| 41575d8e | 105 | .priv_auto = sizeof(struct am654_hbmc_priv), |
| c2dfd0a4 | 106 | }; |