tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2021-2022, NVIDIA CORPORATION. All rights reserved
4 */
5
6#include <linux/clk.h>
7#include <linux/cpufeature.h>
8#include <linux/debugfs.h>
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/device.h>
12#include <linux/io.h>
13#include <linux/interrupt.h>
14#include <linux/ioport.h>
15#include <soc/tegra/fuse.h>
16#include <soc/tegra/tegra-cbb.h>
17
18void tegra_cbb_print_err(struct seq_file *file, const char *fmt, ...)
19{
20 struct va_format vaf;
21 va_list args;
22
23 va_start(args, fmt);
24
25 if (file) {
26 seq_vprintf(file, fmt, args);
27 } else {
28 vaf.fmt = fmt;
29 vaf.va = &args;
30 pr_crit("%pV", &vaf);
31 }
32
33 va_end(args);
34}
35
36void tegra_cbb_print_cache(struct seq_file *file, u32 cache)
37{
38 const char *buff_str, *mod_str, *rd_str, *wr_str;
39
40 buff_str = (cache & BIT(0)) ? "Bufferable " : "";
41 mod_str = (cache & BIT(1)) ? "Modifiable " : "";
42 rd_str = (cache & BIT(2)) ? "Read-Allocate " : "";
43 wr_str = (cache & BIT(3)) ? "Write-Allocate" : "";
44
45 if (cache == 0x0)
46 buff_str = "Device Non-Bufferable";
47
48 tegra_cbb_print_err(file, "\t Cache\t\t\t: 0x%x -- %s%s%s%s\n",
49 cache, buff_str, mod_str, rd_str, wr_str);
50}
51
52void tegra_cbb_print_prot(struct seq_file *file, u32 prot)
53{
54 const char *data_str, *secure_str, *priv_str;
55
56 data_str = (prot & 0x4) ? "Instruction" : "Data";
57 secure_str = (prot & 0x2) ? "Non-Secure" : "Secure";
58 priv_str = (prot & 0x1) ? "Privileged" : "Unprivileged";
59
60 tegra_cbb_print_err(file, "\t Protection\t\t: 0x%x -- %s, %s, %s Access\n",
61 prot, priv_str, secure_str, data_str);
62}
63
64static int tegra_cbb_err_show(struct seq_file *file, void *data)
65{
66 struct tegra_cbb *cbb = file->private;
67
68 return cbb->ops->debugfs_show(cbb, file, data);
69}
70DEFINE_SHOW_ATTRIBUTE(tegra_cbb_err);
71
72static void tegra_cbb_err_debugfs_init(struct tegra_cbb *cbb)
73{
74 static struct dentry *root;
75
76 if (!root)
77 root = debugfs_create_file("tegra_cbb_err", 0444, NULL, cbb, &tegra_cbb_err_fops);
78}
79
80void tegra_cbb_stall_enable(struct tegra_cbb *cbb)
81{
82 if (cbb->ops->stall_enable)
83 cbb->ops->stall_enable(cbb);
84}
85
86void tegra_cbb_fault_enable(struct tegra_cbb *cbb)
87{
88 if (cbb->ops->fault_enable)
89 cbb->ops->fault_enable(cbb);
90}
91
92void tegra_cbb_error_clear(struct tegra_cbb *cbb)
93{
94 if (cbb->ops->error_clear)
95 cbb->ops->error_clear(cbb);
96}
97
98u32 tegra_cbb_get_status(struct tegra_cbb *cbb)
99{
100 if (cbb->ops->get_status)
101 return cbb->ops->get_status(cbb);
102
103 return 0;
104}
105
106int tegra_cbb_get_irq(struct platform_device *pdev, unsigned int *nonsec_irq,
107 unsigned int *sec_irq)
108{
109 unsigned int index = 0;
110 int num_intr = 0, irq;
111
112 num_intr = platform_irq_count(pdev);
113 if (!num_intr)
114 return -EINVAL;
115
116 if (num_intr == 2) {
117 irq = platform_get_irq(pdev, index);
118 if (irq <= 0)
119 return -ENOENT;
120
121 *nonsec_irq = irq;
122 index++;
123 }
124
125 irq = platform_get_irq(pdev, index);
126 if (irq <= 0)
127 return -ENOENT;
128
129 *sec_irq = irq;
130
131 if (num_intr == 1)
132 dev_dbg(&pdev->dev, "secure IRQ: %u\n", *sec_irq);
133
134 if (num_intr == 2)
135 dev_dbg(&pdev->dev, "secure IRQ: %u, non-secure IRQ: %u\n", *sec_irq, *nonsec_irq);
136
137 return 0;
138}
139
140int tegra_cbb_register(struct tegra_cbb *cbb)
141{
142 int ret;
143
144 if (IS_ENABLED(CONFIG_DEBUG_FS))
145 tegra_cbb_err_debugfs_init(cbb);
146
147 /* register interrupt handler for errors due to different initiators */
148 ret = cbb->ops->interrupt_enable(cbb);
149 if (ret < 0) {
150 dev_err(cbb->dev, "Failed to register CBB Interrupt ISR");
151 return ret;
152 }
153
154 cbb->ops->error_enable(cbb);
155 dsb(sy);
156
157 return 0;
158}