diff options
Diffstat (limited to 'drivers/bus/omap_l3_smx.c')
| -rw-r--r-- | drivers/bus/omap_l3_smx.c | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/drivers/bus/omap_l3_smx.c b/drivers/bus/omap_l3_smx.c new file mode 100644 index 000000000..b853a7295 --- /dev/null +++ b/drivers/bus/omap_l3_smx.c @@ -0,0 +1,317 @@ +/* + * 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 <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.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; +} + +#if IS_BUILTIN(CONFIG_OF) +static const struct of_device_id omap3_l3_match[] = { + { + .compatible = "ti,omap3-l3-smx", + }, + { }, +}; +MODULE_DEVICE_TABLE(of, omap3_l3_match); +#endif + +static int 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_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_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 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 = { + .probe = omap3_l3_probe, + .remove = omap3_l3_remove, + .driver = { + .name = "omap_l3_smx", + .of_match_table = of_match_ptr(omap3_l3_match), + }, +}; + +static int __init omap3_l3_init(void) +{ + return platform_driver_register(&omap3_l3_driver); +} +postcore_initcall_sync(omap3_l3_init); + +static void __exit omap3_l3_exit(void) +{ + platform_driver_unregister(&omap3_l3_driver); +} +module_exit(omap3_l3_exit); + +MODULE_AUTHOR("Felipe Balbi"); +MODULE_AUTHOR("Santosh Shilimkar"); +MODULE_AUTHOR("Sricharan R"); +MODULE_DESCRIPTION("OMAP3XXX L3 Interconnect Driver"); +MODULE_LICENSE("GPL"); |