Santosh Shilimkar | 2722e56 | 2011-03-07 20:53:10 +0530 | [diff] [blame] | 1 | /* |
| 2 | * OMAP4XXX L3 Interconnect error handling driver |
| 3 | * |
| 4 | * Copyright (C) 2011 Texas Corporation |
| 5 | * Santosh Shilimkar <santosh.shilimkar@ti.com> |
| 6 | * Sricharan <r.sricharan@ti.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 21 | * USA |
| 22 | */ |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/io.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/slab.h> |
| 29 | |
| 30 | #include "omap_l3_noc.h" |
| 31 | |
| 32 | /* |
| 33 | * Interrupt Handler for L3 error detection. |
| 34 | * 1) Identify the L3 clockdomain partition to which the error belongs to. |
| 35 | * 2) Identify the slave where the error information is logged |
| 36 | * 3) Print the logged information. |
| 37 | * 4) Add dump stack to provide kernel trace. |
| 38 | * |
| 39 | * Two Types of errors : |
| 40 | * 1) Custom errors in L3 : |
| 41 | * Target like DMM/FW/EMIF generates SRESP=ERR error |
| 42 | * 2) Standard L3 error: |
| 43 | * - Unsupported CMD. |
| 44 | * L3 tries to access target while it is idle |
| 45 | * - OCP disconnect. |
| 46 | * - Address hole error: |
| 47 | * If DSS/ISS/FDIF/USBHOSTFS access a target where they |
| 48 | * do not have connectivity, the error is logged in |
| 49 | * their default target which is DMM2. |
| 50 | * |
| 51 | * On High Secure devices, firewall errors are possible and those |
| 52 | * can be trapped as well. But the trapping is implemented as part |
| 53 | * secure software and hence need not be implemented here. |
| 54 | */ |
| 55 | static irqreturn_t l3_interrupt_handler(int irq, void *_l3) |
| 56 | { |
| 57 | |
| 58 | struct omap4_l3 *l3 = _l3; |
| 59 | int inttype, i, j; |
| 60 | int err_src = 0; |
| 61 | u32 std_err_main_addr, std_err_main, err_reg; |
| 62 | u32 base, slave_addr, clear; |
| 63 | char *source_name; |
| 64 | |
| 65 | /* Get the Type of interrupt */ |
| 66 | if (irq == l3->app_irq) |
| 67 | inttype = L3_APPLICATION_ERROR; |
| 68 | else |
| 69 | inttype = L3_DEBUG_ERROR; |
| 70 | |
| 71 | for (i = 0; i < L3_MODULES; i++) { |
| 72 | /* |
| 73 | * Read the regerr register of the clock domain |
| 74 | * to determine the source |
| 75 | */ |
| 76 | base = (u32)l3->l3_base[i]; |
| 77 | err_reg = readl(base + l3_flagmux[i] + (inttype << 3)); |
| 78 | |
| 79 | /* Get the corresponding error and analyse */ |
| 80 | if (err_reg) { |
| 81 | /* Identify the source from control status register */ |
| 82 | for (j = 0; !(err_reg & (1 << j)); j++) |
| 83 | ; |
| 84 | |
| 85 | err_src = j; |
| 86 | /* Read the stderrlog_main_source from clk domain */ |
| 87 | std_err_main_addr = base + (*(l3_targ[i] + err_src)); |
| 88 | std_err_main = readl(std_err_main_addr); |
| 89 | |
| 90 | switch ((std_err_main & CUSTOM_ERROR)) { |
| 91 | case STANDARD_ERROR: |
| 92 | source_name = |
| 93 | l3_targ_stderrlog_main_name[i][err_src]; |
| 94 | |
| 95 | slave_addr = std_err_main_addr + |
| 96 | L3_SLAVE_ADDRESS_OFFSET; |
| 97 | WARN(true, "L3 standard error: SOURCE:%s at address 0x%x\n", |
| 98 | source_name, readl(slave_addr)); |
| 99 | /* clear the std error log*/ |
| 100 | clear = std_err_main | CLEAR_STDERR_LOG; |
| 101 | writel(clear, std_err_main_addr); |
| 102 | break; |
| 103 | |
| 104 | case CUSTOM_ERROR: |
| 105 | source_name = |
| 106 | l3_targ_stderrlog_main_name[i][err_src]; |
| 107 | |
| 108 | WARN(true, "CUSTOM SRESP error with SOURCE:%s\n", |
| 109 | source_name); |
| 110 | /* clear the std error log*/ |
| 111 | clear = std_err_main | CLEAR_STDERR_LOG; |
| 112 | writel(clear, std_err_main_addr); |
| 113 | break; |
| 114 | |
| 115 | default: |
| 116 | /* Nothing to be handled here as of now */ |
| 117 | break; |
| 118 | } |
| 119 | /* Error found so break the for loop */ |
| 120 | break; |
| 121 | } |
| 122 | } |
| 123 | return IRQ_HANDLED; |
| 124 | } |
| 125 | |
| 126 | static int __init omap4_l3_probe(struct platform_device *pdev) |
| 127 | { |
| 128 | static struct omap4_l3 *l3; |
| 129 | struct resource *res; |
| 130 | int ret; |
| 131 | int irq; |
| 132 | |
| 133 | l3 = kzalloc(sizeof(*l3), GFP_KERNEL); |
| 134 | if (!l3) |
| 135 | ret = -ENOMEM; |
| 136 | |
| 137 | platform_set_drvdata(pdev, l3); |
| 138 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 139 | if (!res) { |
| 140 | dev_err(&pdev->dev, "couldn't find resource 0\n"); |
| 141 | ret = -ENODEV; |
| 142 | goto err1; |
| 143 | } |
| 144 | |
| 145 | l3->l3_base[0] = ioremap(res->start, resource_size(res)); |
| 146 | if (!(l3->l3_base[0])) { |
| 147 | dev_err(&pdev->dev, "ioremap failed\n"); |
| 148 | ret = -ENOMEM; |
| 149 | goto err2; |
| 150 | } |
| 151 | |
| 152 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 153 | if (!res) { |
| 154 | dev_err(&pdev->dev, "couldn't find resource 1\n"); |
| 155 | ret = -ENODEV; |
| 156 | goto err3; |
| 157 | } |
| 158 | |
| 159 | l3->l3_base[1] = ioremap(res->start, resource_size(res)); |
| 160 | if (!(l3->l3_base[1])) { |
| 161 | dev_err(&pdev->dev, "ioremap failed\n"); |
| 162 | ret = -ENOMEM; |
| 163 | goto err4; |
| 164 | } |
| 165 | |
| 166 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); |
| 167 | if (!res) { |
| 168 | dev_err(&pdev->dev, "couldn't find resource 2\n"); |
| 169 | ret = -ENODEV; |
| 170 | goto err5; |
| 171 | } |
| 172 | |
| 173 | l3->l3_base[2] = ioremap(res->start, resource_size(res)); |
| 174 | if (!(l3->l3_base[2])) { |
| 175 | dev_err(&pdev->dev, "ioremap failed\n"); |
| 176 | ret = -ENOMEM; |
| 177 | goto err6; |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * Setup interrupt Handlers |
| 182 | */ |
| 183 | irq = platform_get_irq(pdev, 0); |
| 184 | ret = request_irq(irq, |
| 185 | l3_interrupt_handler, |
| 186 | IRQF_DISABLED, "l3-dbg-irq", l3); |
| 187 | if (ret) { |
| 188 | pr_crit("L3: request_irq failed to register for 0x%x\n", |
| 189 | OMAP44XX_IRQ_L3_DBG); |
| 190 | goto err7; |
| 191 | } |
| 192 | l3->debug_irq = irq; |
| 193 | |
| 194 | irq = platform_get_irq(pdev, 1); |
| 195 | ret = request_irq(irq, |
| 196 | l3_interrupt_handler, |
| 197 | IRQF_DISABLED, "l3-app-irq", l3); |
| 198 | if (ret) { |
| 199 | pr_crit("L3: request_irq failed to register for 0x%x\n", |
| 200 | OMAP44XX_IRQ_L3_APP); |
| 201 | goto err8; |
| 202 | } |
| 203 | l3->app_irq = irq; |
| 204 | |
| 205 | goto err0; |
| 206 | err8: |
| 207 | err7: |
| 208 | iounmap(l3->l3_base[2]); |
| 209 | err6: |
| 210 | err5: |
| 211 | iounmap(l3->l3_base[1]); |
| 212 | err4: |
| 213 | err3: |
| 214 | iounmap(l3->l3_base[0]); |
| 215 | err2: |
| 216 | err1: |
| 217 | kfree(l3); |
| 218 | err0: |
| 219 | return ret; |
| 220 | } |
| 221 | |
| 222 | static int __exit omap4_l3_remove(struct platform_device *pdev) |
| 223 | { |
| 224 | struct omap4_l3 *l3 = platform_get_drvdata(pdev); |
| 225 | |
| 226 | free_irq(l3->app_irq, l3); |
| 227 | free_irq(l3->debug_irq, l3); |
| 228 | iounmap(l3->l3_base[0]); |
| 229 | iounmap(l3->l3_base[1]); |
| 230 | iounmap(l3->l3_base[2]); |
| 231 | kfree(l3); |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | static struct platform_driver omap4_l3_driver = { |
| 237 | .remove = __exit_p(omap4_l3_remove), |
| 238 | .driver = { |
| 239 | .name = "omap_l3_noc", |
| 240 | }, |
| 241 | }; |
| 242 | |
| 243 | static int __init omap4_l3_init(void) |
| 244 | { |
| 245 | return platform_driver_probe(&omap4_l3_driver, omap4_l3_probe); |
| 246 | } |
| 247 | postcore_initcall_sync(omap4_l3_init); |
| 248 | |
| 249 | static void __exit omap4_l3_exit(void) |
| 250 | { |
| 251 | platform_driver_unregister(&omap4_l3_driver); |
| 252 | } |
| 253 | module_exit(omap4_l3_exit); |