projects / J-u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 344eb6d5 TK |
1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* | |
| 3 | * Texas Instruments' K3 Error Signalling Module driver | |
| 4 | * | |
| 5 | * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ | |
| 6 | * Tero Kristo <[email protected]> | |
| 7 | * | |
| 8 | */ | |
| 9 | ||
| 10 | #include <common.h> | |
| 11 | #include <dm.h> | |
| 12 | #include <errno.h> | |
| 13 | #include <asm/io.h> | |
| 14 | #include <dm/device_compat.h> | |
| cd93d625 | 15 | #include <linux/bitops.h> |
| 344eb6d5 TK |
16 | |
| 17 | #define ESM_SFT_RST 0x0c | |
| 18 | #define ESM_SFT_RST_KEY 0x0f | |
| 19 | ||
| 20 | #define ESM_STS(i) (0x404 + (i) / 32 * 0x20) | |
| 21 | #define ESM_PIN_EN_SET_OFFSET(i) (0x414 + (i) / 32 * 0x20) | |
| 22 | #define ESM_PIN_MASK(i) BIT((i) & 0x1f) | |
| 23 | ||
| 24 | static void esm_pin_enable(void __iomem *base, int pin) | |
| 25 | { | |
| 26 | /* Enable event */ | |
| 27 | writel(ESM_PIN_MASK(pin), base + ESM_PIN_EN_SET_OFFSET(pin)); | |
| 28 | } | |
| 29 | ||
| 30 | /** | |
| 31 | * k3_esm_probe: configures ESM based on DT data | |
| 32 | * | |
| 33 | * Parses ESM info from device tree, and configures the module accordingly. | |
| 34 | */ | |
| 35 | static int k3_esm_probe(struct udevice *dev) | |
| 36 | { | |
| 37 | int ret; | |
| 38 | void __iomem *base; | |
| 39 | int num_pins; | |
| 40 | u32 *pins; | |
| 41 | int i; | |
| 42 | ||
| 43 | base = dev_remap_addr_index(dev, 0); | |
| 44 | if (!base) | |
| 45 | return -ENODEV; | |
| 46 | ||
| 47 | num_pins = dev_read_size(dev, "ti,esm-pins"); | |
| 48 | if (num_pins < 0) { | |
| 49 | dev_err(dev, "ti,esm-pins property missing or invalid: %d\n", | |
| 50 | num_pins); | |
| 51 | return num_pins; | |
| 52 | } | |
| 53 | ||
| 54 | num_pins /= sizeof(u32); | |
| 55 | ||
| 56 | pins = kmalloc(num_pins * sizeof(u32), __GFP_ZERO); | |
| 57 | if (!pins) | |
| 58 | return -ENOMEM; | |
| 59 | ||
| 60 | ret = dev_read_u32_array(dev, "ti,esm-pins", pins, num_pins); | |
| 61 | if (ret < 0) { | |
| 62 | dev_err(dev, "failed to read ti,esm-pins property: %d\n", | |
| 63 | ret); | |
| 64 | goto free_pins; | |
| 65 | } | |
| 66 | ||
| 67 | /* Clear any pending events */ | |
| 68 | writel(ESM_SFT_RST_KEY, base + ESM_SFT_RST); | |
| 69 | ||
| 70 | for (i = 0; i < num_pins; i++) | |
| 71 | esm_pin_enable(base, pins[i]); | |
| 72 | ||
| 73 | free_pins: | |
| 74 | kfree(pins); | |
| 75 | return ret; | |
| 76 | } | |
| 77 | ||
| 78 | static const struct udevice_id k3_esm_ids[] = { | |
| 79 | { .compatible = "ti,j721e-esm" }, | |
| 80 | {} | |
| 81 | }; | |
| 82 | ||
| 83 | U_BOOT_DRIVER(k3_esm) = { | |
| 84 | .name = "k3_esm", | |
| 85 | .of_match = k3_esm_ids, | |
| 86 | .id = UCLASS_MISC, | |
| 87 | .probe = k3_esm_probe, | |
| 88 | }; |