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 <t-kristo@ti.com>
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>
15 #include <linux/bitops.h>
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
esm_pin_enable(void __iomem * base,int pin)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 */
k3_esm_probe(struct udevice * dev)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 };
89