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 18 void 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 36 void 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 52 void 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 64 static 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 } 70 DEFINE_SHOW_ATTRIBUTE(tegra_cbb_err); 71 72 static int 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 if (IS_ERR_OR_NULL(root)) { 79 pr_err("%s(): could not create debugfs node\n", __func__); 80 return PTR_ERR(root); 81 } 82 } 83 84 return 0; 85 } 86 87 void tegra_cbb_stall_enable(struct tegra_cbb *cbb) 88 { 89 if (cbb->ops->stall_enable) 90 cbb->ops->stall_enable(cbb); 91 } 92 93 void tegra_cbb_fault_enable(struct tegra_cbb *cbb) 94 { 95 if (cbb->ops->fault_enable) 96 cbb->ops->fault_enable(cbb); 97 } 98 99 void tegra_cbb_error_clear(struct tegra_cbb *cbb) 100 { 101 if (cbb->ops->error_clear) 102 cbb->ops->error_clear(cbb); 103 } 104 105 u32 tegra_cbb_get_status(struct tegra_cbb *cbb) 106 { 107 if (cbb->ops->get_status) 108 return cbb->ops->get_status(cbb); 109 110 return 0; 111 } 112 113 int tegra_cbb_get_irq(struct platform_device *pdev, unsigned int *nonsec_irq, 114 unsigned int *sec_irq) 115 { 116 unsigned int index = 0; 117 int num_intr = 0, irq; 118 119 num_intr = platform_irq_count(pdev); 120 if (!num_intr) 121 return -EINVAL; 122 123 if (num_intr == 2) { 124 irq = platform_get_irq(pdev, index); 125 if (irq <= 0) 126 return -ENOENT; 127 128 *nonsec_irq = irq; 129 index++; 130 } 131 132 irq = platform_get_irq(pdev, index); 133 if (irq <= 0) 134 return -ENOENT; 135 136 *sec_irq = irq; 137 138 if (num_intr == 1) 139 dev_dbg(&pdev->dev, "secure IRQ: %u\n", *sec_irq); 140 141 if (num_intr == 2) 142 dev_dbg(&pdev->dev, "secure IRQ: %u, non-secure IRQ: %u\n", *sec_irq, *nonsec_irq); 143 144 return 0; 145 } 146 147 int tegra_cbb_register(struct tegra_cbb *cbb) 148 { 149 int ret; 150 151 if (IS_ENABLED(CONFIG_DEBUG_FS)) { 152 ret = tegra_cbb_err_debugfs_init(cbb); 153 if (ret) { 154 dev_err(cbb->dev, "failed to create debugfs\n"); 155 return ret; 156 } 157 } 158 159 /* register interrupt handler for errors due to different initiators */ 160 ret = cbb->ops->interrupt_enable(cbb); 161 if (ret < 0) { 162 dev_err(cbb->dev, "Failed to register CBB Interrupt ISR"); 163 return ret; 164 } 165 166 cbb->ops->error_enable(cbb); 167 dsb(sy); 168 169 return 0; 170 } 171