1 // SPDX-License-Identifier: GPL-2.0+
3 * Texas Instruments' K3 Error Signalling Module driver
5 * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
6 * Tero Kristo <t-kristo@ti.com>
14 #include <dm/device_compat.h>
16 #define ESM_SFT_RST 0x0c
17 #define ESM_SFT_RST_KEY 0x0f
19 #define ESM_STS(i) (0x404 + (i) / 32 * 0x20)
20 #define ESM_PIN_EN_SET_OFFSET(i) (0x414 + (i) / 32 * 0x20)
21 #define ESM_PIN_MASK(i) BIT((i) & 0x1f)
23 static void esm_pin_enable(void __iomem *base, int pin)
26 writel(ESM_PIN_MASK(pin), base + ESM_PIN_EN_SET_OFFSET(pin));
30 * k3_esm_probe: configures ESM based on DT data
32 * Parses ESM info from device tree, and configures the module accordingly.
34 static int k3_esm_probe(struct udevice *dev)
42 base = dev_remap_addr_index(dev, 0);
46 num_pins = dev_read_size(dev, "ti,esm-pins");
48 dev_err(dev, "ti,esm-pins property missing or invalid: %d\n",
53 num_pins /= sizeof(u32);
55 pins = kmalloc(num_pins * sizeof(u32), __GFP_ZERO);
59 ret = dev_read_u32_array(dev, "ti,esm-pins", pins, num_pins);
61 dev_err(dev, "failed to read ti,esm-pins property: %d\n",
66 /* Clear any pending events */
67 writel(ESM_SFT_RST_KEY, base + ESM_SFT_RST);
69 for (i = 0; i < num_pins; i++)
70 esm_pin_enable(base, pins[i]);
77 static const struct udevice_id k3_esm_ids[] = {
78 { .compatible = "ti,j721e-esm" },
82 U_BOOT_DRIVER(k3_esm) = {
84 .of_match = k3_esm_ids,
86 .probe = k3_esm_probe,