/* * OMAP3XXX L3 Interconnect Driver * * Copyright (C) 2011 Texas Corporation * Felipe Balbi <balbi@ti.com> * 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/kernel.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/io.h> #include "omap_l3_smx.h" static inline u64 omap3_l3_readll(void __iomem *base, u16 reg) { return __raw_readll(base + reg); } static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value) { __raw_writell(value, base + reg); } static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error) { return (error & 0x0f000000) >> L3_ERROR_LOG_CODE; } static inline u32 omap3_l3_decode_addr(u64 error_addr) { return error_addr & 0xffffffff; } static inline unsigned omap3_l3_decode_cmd(u64 error) { return (error & 0x07) >> L3_ERROR_LOG_CMD; } static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error) { return (error & 0xff00) >> L3_ERROR_LOG_INITID; } static inline unsigned omap3_l3_decode_req_info(u64 error) { return (error >> 32) & 0xffff; } static char *omap3_l3_code_string(u8 code) { switch (code) { case OMAP_L3_CODE_NOERROR: return "No Error"; case OMAP_L3_CODE_UNSUP_CMD: return "Unsupported Command"; case OMAP_L3_CODE_ADDR_HOLE: return "Address Hole"; case OMAP_L3_CODE_PROTECT_VIOLATION: return "Protection Violation"; case OMAP_L3_CODE_IN_BAND_ERR: return "In-band Error"; case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT: return "Request Timeout Not Accepted"; case OMAP_L3_CODE_REQ_TOUT_NO_RESP: return "Request Timeout, no response"; default: return "UNKNOWN error"; } } static char *omap3_l3_initiator_string(u8 initid) { switch (initid) { case OMAP_L3_LCD: return "LCD"; case OMAP_L3_SAD2D: return "SAD2D"; case OMAP_L3_IA_MPU_SS_1: case OMAP_L3_IA_MPU_SS_2: case OMAP_L3_IA_MPU_SS_3: case OMAP_L3_IA_MPU_SS_4: case OMAP_L3_IA_MPU_SS_5: return "MPU"; case OMAP_L3_IA_IVA_SS_1: case OMAP_L3_IA_IVA_SS_2: case OMAP_L3_IA_IVA_SS_3: return "IVA_SS"; case OMAP_L3_IA_IVA_SS_DMA_1: case OMAP_L3_IA_IVA_SS_DMA_2: case OMAP_L3_IA_IVA_SS_DMA_3: case OMAP_L3_IA_IVA_SS_DMA_4: case OMAP_L3_IA_IVA_SS_DMA_5: case OMAP_L3_IA_IVA_SS_DMA_6: return "IVA_SS_DMA"; case OMAP_L3_IA_SGX: return "SGX"; case OMAP_L3_IA_CAM_1: case OMAP_L3_IA_CAM_2: case OMAP_L3_IA_CAM_3: return "CAM"; case OMAP_L3_IA_DAP: return "DAP"; case OMAP_L3_SDMA_WR_1: case OMAP_L3_SDMA_WR_2: return "SDMA_WR"; case OMAP_L3_SDMA_RD_1: case OMAP_L3_SDMA_RD_2: case OMAP_L3_SDMA_RD_3: case OMAP_L3_SDMA_RD_4: return "SDMA_RD"; case OMAP_L3_USBOTG: return "USB_OTG"; case OMAP_L3_USBHOST: return "USB_HOST"; default: return "UNKNOWN Initiator"; } } /* * omap3_l3_block_irq - handles a register block's irq * @l3: struct omap3_l3 * * @base: register block base address * @error: L3_ERROR_LOG register of our block * * Called in hard-irq context. Caller should take care of locking * * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error * Analysis Sequence, we are following that sequence here, please * refer to that Figure for more information on the subject. */ static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3, u64 error, int error_addr) { u8 code = omap3_l3_decode_error_code(error); u8 initid = omap3_l3_decode_initid(error); u8 multi = error & L3_ERROR_LOG_MULTI; u32 address = omap3_l3_decode_addr(error_addr); pr_err("%s seen by %s %s at address %x\n", omap3_l3_code_string(code), omap3_l3_initiator_string(initid), multi ? "Multiple Errors" : "", address); WARN_ON(1); return IRQ_HANDLED; } static irqreturn_t omap3_l3_app_irq(int irq, void *_l3) { struct omap3_l3 *l3 = _l3; u64 status, clear; u64 error; u64 error_addr; u64 err_source = 0; void __iomem *base; int int_type; irqreturn_t ret = IRQ_NONE; int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR; if (!int_type) { status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0); /* * if we have a timeout error, there's nothing we can * do besides rebooting the board. So let's BUG on any * of such errors and handle the others. timeout error * is severe and not expected to occur. */ BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK); } else { status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1); /* No timeout error for debug sources */ } /* identify the error source */ err_source = __ffs(status); base = l3->rt + omap3_l3_bases[int_type][err_source]; error = omap3_l3_readll(base, L3_ERROR_LOG); if (error) { error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR); ret |= omap3_l3_block_irq(l3, error, error_addr); } /* Clear the status register */ clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) | L3_AGENT_STATUS_CLEAR_TA; omap3_l3_writell(base, L3_AGENT_STATUS, clear); /* clear the error log register */ omap3_l3_writell(base, L3_ERROR_LOG, error); return ret; } static int __init omap3_l3_probe(struct platform_device *pdev) { struct omap3_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\n"); ret = -ENODEV; goto err0; } l3->rt = ioremap(res->start, resource_size(res)); if (!l3->rt) { dev_err(&pdev->dev, "ioremap failed\n"); ret = -ENOMEM; goto err0; } l3->debug_irq = platform_get_irq(pdev, 0); ret = request_irq(l3->debug_irq, omap3_l3_app_irq, IRQF_DISABLED | IRQF_TRIGGER_RISING, "l3-debug-irq", l3); if (ret) { dev_err(&pdev->dev, "couldn't request debug irq\n"); goto err1; } l3->app_irq = platform_get_irq(pdev, 1); ret = request_irq(l3->app_irq, omap3_l3_app_irq, IRQF_DISABLED | IRQF_TRIGGER_RISING, "l3-app-irq", l3); if (ret) { dev_err(&pdev->dev, "couldn't request app irq\n"); goto err2; } return 0; err2: free_irq(l3->debug_irq, l3); err1: iounmap(l3->rt); err0: kfree(l3); return ret; } static int __exit omap3_l3_remove(struct platform_device *pdev) { struct omap3_l3 *l3 = platform_get_drvdata(pdev); free_irq(l3->app_irq, l3); free_irq(l3->debug_irq, l3); iounmap(l3->rt); kfree(l3); return 0; } static struct platform_driver omap3_l3_driver = { .remove = __exit_p(omap3_l3_remove), .driver = { .name = "omap_l3_smx", }, }; static int __init omap3_l3_init(void) { return platform_driver_probe(&omap3_l3_driver, omap3_l3_probe); } postcore_initcall_sync(omap3_l3_init); static void __exit omap3_l3_exit(void) { platform_driver_unregister(&omap3_l3_driver); } module_exit(omap3_l3_exit);