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>
15 #include <linux/bitops.h>
17 #define ESM_SFT_RST 0x0c
18 #define ESM_SFT_RST_KEY 0x0f
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)
24 static void esm_pin_enable(void __iomem *base, int pin)
27 writel(ESM_PIN_MASK(pin), base + ESM_PIN_EN_SET_OFFSET(pin));
31 * k3_esm_probe: configures ESM based on DT data
33 * Parses ESM info from device tree, and configures the module accordingly.
35 static int k3_esm_probe(struct udevice *dev)
43 base = dev_remap_addr_index(dev, 0);
47 num_pins = dev_read_size(dev, "ti,esm-pins");
49 dev_err(dev, "ti,esm-pins property missing or invalid: %d\n",
54 num_pins /= sizeof(u32);
56 pins = kmalloc(num_pins * sizeof(u32), __GFP_ZERO);
60 ret = dev_read_u32_array(dev, "ti,esm-pins", pins, num_pins);
62 dev_err(dev, "failed to read ti,esm-pins property: %d\n",
67 /* Clear any pending events */
68 writel(ESM_SFT_RST_KEY, base + ESM_SFT_RST);
70 for (i = 0; i < num_pins; i++)
71 esm_pin_enable(base, pins[i]);
78 static const struct udevice_id k3_esm_ids[] = {
79 { .compatible = "ti,j721e-esm" },
83 U_BOOT_DRIVER(k3_esm) = {
85 .of_match = k3_esm_ids,
87 .probe = k3_esm_probe,