diff options
Diffstat (limited to 'drivers/bus/omap_l3_noc.c')
| -rw-r--r-- | drivers/bus/omap_l3_noc.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/drivers/bus/omap_l3_noc.c b/drivers/bus/omap_l3_noc.c new file mode 100644 index 00000000000..ab911a33f8a --- /dev/null +++ b/drivers/bus/omap_l3_noc.c @@ -0,0 +1,266 @@ +/* + * OMAP4XXX L3 Interconnect error handling driver + * + * Copyright (C) 2011 Texas Corporation + * Santosh Shilimkar <santosh.shilimkar@ti.com> + * Sricharan <r.sricharan@ti.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + * USA + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/slab.h> + +#include "omap_l3_noc.h" + +/* + * Interrupt Handler for L3 error detection. + * 1) Identify the L3 clockdomain partition to which the error belongs to. + * 2) Identify the slave where the error information is logged + * 3) Print the logged information. + * 4) Add dump stack to provide kernel trace. + * + * Two Types of errors : + * 1) Custom errors in L3 : + * Target like DMM/FW/EMIF generates SRESP=ERR error + * 2) Standard L3 error: + * - Unsupported CMD. + * L3 tries to access target while it is idle + * - OCP disconnect. + * - Address hole error: + * If DSS/ISS/FDIF/USBHOSTFS access a target where they + * do not have connectivity, the error is logged in + * their default target which is DMM2. + * + * On High Secure devices, firewall errors are possible and those + * can be trapped as well. But the trapping is implemented as part + * secure software and hence need not be implemented here. + */ +static irqreturn_t l3_interrupt_handler(int irq, void *_l3) +{ + + struct omap4_l3 *l3 = _l3; + int inttype, i, k; + int err_src = 0; + u32 std_err_main, err_reg, clear, masterid; + void __iomem *base, *l3_targ_base; + char *target_name, *master_name = "UN IDENTIFIED"; + + /* Get the Type of interrupt */ + inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR; + + for (i = 0; i < L3_MODULES; i++) { + /* + * Read the regerr register of the clock domain + * to determine the source + */ + base = l3->l3_base[i]; + err_reg = __raw_readl(base + l3_flagmux[i] + + + L3_FLAGMUX_REGERR0 + (inttype << 3)); + + /* Get the corresponding error and analyse */ + if (err_reg) { + /* Identify the source from control status register */ + err_src = __ffs(err_reg); + + /* Read the stderrlog_main_source from clk domain */ + l3_targ_base = base + *(l3_targ[i] + err_src); + std_err_main = __raw_readl(l3_targ_base + + L3_TARG_STDERRLOG_MAIN); + masterid = __raw_readl(l3_targ_base + + L3_TARG_STDERRLOG_MSTADDR); + + switch (std_err_main & CUSTOM_ERROR) { + case STANDARD_ERROR: + target_name = + l3_targ_inst_name[i][err_src]; + WARN(true, "L3 standard error: TARGET:%s at address 0x%x\n", + target_name, + __raw_readl(l3_targ_base + + L3_TARG_STDERRLOG_SLVOFSLSB)); + /* clear the std error log*/ + clear = std_err_main | CLEAR_STDERR_LOG; + writel(clear, l3_targ_base + + L3_TARG_STDERRLOG_MAIN); + break; + + case CUSTOM_ERROR: + target_name = + l3_targ_inst_name[i][err_src]; + for (k = 0; k < NUM_OF_L3_MASTERS; k++) { + if (masterid == l3_masters[k].id) + master_name = + l3_masters[k].name; + } + WARN(true, "L3 custom error: MASTER:%s TARGET:%s\n", + master_name, target_name); + /* clear the std error log*/ + clear = std_err_main | CLEAR_STDERR_LOG; + writel(clear, l3_targ_base + + L3_TARG_STDERRLOG_MAIN); + break; + + default: + /* Nothing to be handled here as of now */ + break; + } + /* Error found so break the for loop */ + break; + } + } + return IRQ_HANDLED; +} + +static int __devinit omap4_l3_probe(struct platform_device *pdev) +{ + static struct omap4_l3 *l3; + struct resource *res; + int ret; + + l3 = kzalloc(sizeof(*l3), GFP_KERNEL); + if (!l3) + return -ENOMEM; + + platform_set_drvdata(pdev, l3); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "couldn't find resource 0\n"); + ret = -ENODEV; + goto err0; + } + + l3->l3_base[0] = ioremap(res->start, resource_size(res)); + if (!l3->l3_base[0]) { + dev_err(&pdev->dev, "ioremap failed\n"); + ret = -ENOMEM; + goto err0; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) { + dev_err(&pdev->dev, "couldn't find resource 1\n"); + ret = -ENODEV; + goto err1; + } + + l3->l3_base[1] = ioremap(res->start, resource_size(res)); + if (!l3->l3_base[1]) { + dev_err(&pdev->dev, "ioremap failed\n"); + ret = -ENOMEM; + goto err1; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 2); + if (!res) { + dev_err(&pdev->dev, "couldn't find resource 2\n"); + ret = -ENODEV; + goto err2; + } + + l3->l3_base[2] = ioremap(res->start, resource_size(res)); + if (!l3->l3_base[2]) { + dev_err(&pdev->dev, "ioremap failed\n"); + ret = -ENOMEM; + goto err2; + } + + /* + * Setup interrupt Handlers + */ + l3->debug_irq = platform_get_irq(pdev, 0); + ret = request_irq(l3->debug_irq, + l3_interrupt_handler, + IRQF_DISABLED, "l3-dbg-irq", l3); + if (ret) { + pr_crit("L3: request_irq failed to register for 0x%x\n", + l3->debug_irq); + goto err3; + } + + l3->app_irq = platform_get_irq(pdev, 1); + ret = request_irq(l3->app_irq, + l3_interrupt_handler, + IRQF_DISABLED, "l3-app-irq", l3); + if (ret) { + pr_crit("L3: request_irq failed to register for 0x%x\n", + l3->app_irq); + goto err4; + } + + return 0; + +err4: + free_irq(l3->debug_irq, l3); +err3: + iounmap(l3->l3_base[2]); +err2: + iounmap(l3->l3_base[1]); +err1: + iounmap(l3->l3_base[0]); +err0: + kfree(l3); + return ret; +} + +static int __devexit omap4_l3_remove(struct platform_device *pdev) +{ + struct omap4_l3 *l3 = platform_get_drvdata(pdev); + + free_irq(l3->app_irq, l3); + free_irq(l3->debug_irq, l3); + iounmap(l3->l3_base[0]); + iounmap(l3->l3_base[1]); + iounmap(l3->l3_base[2]); + kfree(l3); + + return 0; +} + +#if defined(CONFIG_OF) +static const struct of_device_id l3_noc_match[] = { + {.compatible = "ti,omap4-l3-noc", }, + {}, +}; +MODULE_DEVICE_TABLE(of, l3_noc_match); +#else +#define l3_noc_match NULL +#endif + +static struct platform_driver omap4_l3_driver = { + .probe = omap4_l3_probe, + .remove = __devexit_p(omap4_l3_remove), + .driver = { + .name = "omap_l3_noc", + .owner = THIS_MODULE, + .of_match_table = l3_noc_match, + }, +}; + +static int __init omap4_l3_init(void) +{ + return platform_driver_register(&omap4_l3_driver); +} +postcore_initcall_sync(omap4_l3_init); + +static void __exit omap4_l3_exit(void) +{ + platform_driver_unregister(&omap4_l3_driver); +} +module_exit(omap4_l3_exit); |