drivers/bus/omap_l3_smx.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * 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>
  */

 #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 "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);
 	else
 		status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);

 	/* 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);
 	}

 	/*
 	 * 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(!int_type && status & L3_STATUS_0_TIMEOUT_MASK);

 	/* 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");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* 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>
	*/

	#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 "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);
	else
	status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);

	/* 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);
	}

	/*
	* 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(!int_type && status & L3_STATUS_0_TIMEOUT_MASK);

	/* 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");