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 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 80 void tegra_cbb_stall_enable(struct tegra_cbb *cbb) 81 { 82 if (cbb->ops->stall_enable) 83 cbb->ops->stall_enable(cbb); 84 } 85 86 void tegra_cbb_fault_enable(struct tegra_cbb *cbb) 87 { 88 if (cbb->ops->fault_enable) 89 cbb->ops->fault_enable(cbb); 90 } 91 92 void tegra_cbb_error_clear(struct tegra_cbb *cbb) 93 { 94 if (cbb->ops->error_clear) 95 cbb->ops->error_clear(cbb); 96 } 97 98 u32 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 } 105 106 int 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 } 139 140 int 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 } 159