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/of.h>
11 #include <linux/of_device.h>
12 #include <linux/platform_device.h>
13 #include <linux/device.h>
14 #include <linux/io.h>
15 #include <linux/of_irq.h>
16 #include <linux/of_address.h>
17 #include <linux/interrupt.h>
18 #include <linux/ioport.h>
19 #include <linux/version.h>
20 #include <soc/tegra/fuse.h>
21 #include <soc/tegra/tegra-cbb.h>
22
tegra_cbb_print_err(struct seq_file * file,const char * fmt,...)23 void tegra_cbb_print_err(struct seq_file *file, const char *fmt, ...)
24 {
25 struct va_format vaf;
26 va_list args;
27
28 va_start(args, fmt);
29
30 if (file) {
31 seq_vprintf(file, fmt, args);
32 } else {
33 vaf.fmt = fmt;
34 vaf.va = &args;
35 pr_crit("%pV", &vaf);
36 }
37
38 va_end(args);
39 }
40
tegra_cbb_print_cache(struct seq_file * file,u32 cache)41 void tegra_cbb_print_cache(struct seq_file *file, u32 cache)
42 {
43 const char *buff_str, *mod_str, *rd_str, *wr_str;
44
45 buff_str = (cache & BIT(0)) ? "Bufferable " : "";
46 mod_str = (cache & BIT(1)) ? "Modifiable " : "";
47 rd_str = (cache & BIT(2)) ? "Read-Allocate " : "";
48 wr_str = (cache & BIT(3)) ? "Write-Allocate" : "";
49
50 if (cache == 0x0)
51 buff_str = "Device Non-Bufferable";
52
53 tegra_cbb_print_err(file, "\t Cache\t\t\t: 0x%x -- %s%s%s%s\n",
54 cache, buff_str, mod_str, rd_str, wr_str);
55 }
56
tegra_cbb_print_prot(struct seq_file * file,u32 prot)57 void tegra_cbb_print_prot(struct seq_file *file, u32 prot)
58 {
59 const char *data_str, *secure_str, *priv_str;
60
61 data_str = (prot & 0x4) ? "Instruction" : "Data";
62 secure_str = (prot & 0x2) ? "Non-Secure" : "Secure";
63 priv_str = (prot & 0x1) ? "Privileged" : "Unprivileged";
64
65 tegra_cbb_print_err(file, "\t Protection\t\t: 0x%x -- %s, %s, %s Access\n",
66 prot, priv_str, secure_str, data_str);
67 }
68
tegra_cbb_err_show(struct seq_file * file,void * data)69 static int tegra_cbb_err_show(struct seq_file *file, void *data)
70 {
71 struct tegra_cbb *cbb = file->private;
72
73 return cbb->ops->debugfs_show(cbb, file, data);
74 }
75 DEFINE_SHOW_ATTRIBUTE(tegra_cbb_err);
76
tegra_cbb_err_debugfs_init(struct tegra_cbb * cbb)77 static int tegra_cbb_err_debugfs_init(struct tegra_cbb *cbb)
78 {
79 static struct dentry *root;
80
81 if (!root) {
82 root = debugfs_create_file("tegra_cbb_err", 0444, NULL, cbb, &tegra_cbb_err_fops);
83 if (IS_ERR_OR_NULL(root)) {
84 pr_err("%s(): could not create debugfs node\n", __func__);
85 return PTR_ERR(root);
86 }
87 }
88
89 return 0;
90 }
91
tegra_cbb_stall_enable(struct tegra_cbb * cbb)92 void tegra_cbb_stall_enable(struct tegra_cbb *cbb)
93 {
94 if (cbb->ops->stall_enable)
95 cbb->ops->stall_enable(cbb);
96 }
97
tegra_cbb_fault_enable(struct tegra_cbb * cbb)98 void tegra_cbb_fault_enable(struct tegra_cbb *cbb)
99 {
100 if (cbb->ops->fault_enable)
101 cbb->ops->fault_enable(cbb);
102 }
103
tegra_cbb_error_clear(struct tegra_cbb * cbb)104 void tegra_cbb_error_clear(struct tegra_cbb *cbb)
105 {
106 if (cbb->ops->error_clear)
107 cbb->ops->error_clear(cbb);
108 }
109
tegra_cbb_get_status(struct tegra_cbb * cbb)110 u32 tegra_cbb_get_status(struct tegra_cbb *cbb)
111 {
112 if (cbb->ops->get_status)
113 return cbb->ops->get_status(cbb);
114
115 return 0;
116 }
117
tegra_cbb_get_irq(struct platform_device * pdev,unsigned int * nonsec_irq,unsigned int * sec_irq)118 int tegra_cbb_get_irq(struct platform_device *pdev, unsigned int *nonsec_irq,
119 unsigned int *sec_irq)
120 {
121 unsigned int index = 0;
122 int num_intr = 0, irq;
123
124 num_intr = platform_irq_count(pdev);
125 if (!num_intr)
126 return -EINVAL;
127
128 if (num_intr == 2) {
129 irq = platform_get_irq(pdev, index);
130 if (irq <= 0) {
131 dev_err(&pdev->dev, "failed to get non-secure IRQ: %d\n", irq);
132 return -ENOENT;
133 }
134
135 *nonsec_irq = irq;
136 index++;
137 }
138
139 irq = platform_get_irq(pdev, index);
140 if (irq <= 0) {
141 dev_err(&pdev->dev, "failed to get secure IRQ: %d\n", irq);
142 return -ENOENT;
143 }
144
145 *sec_irq = irq;
146
147 if (num_intr == 1)
148 dev_dbg(&pdev->dev, "secure IRQ: %u\n", *sec_irq);
149
150 if (num_intr == 2)
151 dev_dbg(&pdev->dev, "secure IRQ: %u, non-secure IRQ: %u\n", *sec_irq, *nonsec_irq);
152
153 return 0;
154 }
155
tegra_cbb_register(struct tegra_cbb * cbb)156 int tegra_cbb_register(struct tegra_cbb *cbb)
157 {
158 int ret;
159
160 if (IS_ENABLED(CONFIG_DEBUG_FS)) {
161 ret = tegra_cbb_err_debugfs_init(cbb);
162 if (ret) {
163 dev_err(cbb->dev, "failed to create debugfs\n");
164 return ret;
165 }
166 }
167
168 /* register interrupt handler for errors due to different initiators */
169 ret = cbb->ops->interrupt_enable(cbb);
170 if (ret < 0) {
171 dev_err(cbb->dev, "Failed to register CBB Interrupt ISR");
172 return ret;
173 }
174
175 cbb->ops->error_enable(cbb);
176 dsb(sy);
177
178 return 0;
179 }
180