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2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87 
 kernel/drivers/bus/brcmstb_gisb.c
....@@ -1,14 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright (C) 2014-2017 Broadcom
3
- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
124  */
135 
146 #include <linux/init.h>
....@@ -38,8 +30,22 @@
3830 #define  ARB_ERR_CAP_STATUS_WRITE	(1 << 1)
3931 #define  ARB_ERR_CAP_STATUS_VALID	(1 << 0)
4032 
33
+#define  ARB_BP_CAP_CLEAR		(1 << 0)
34
+#define  ARB_BP_CAP_STATUS_PROT_SHIFT	14
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+#define  ARB_BP_CAP_STATUS_TYPE		(1 << 13)
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+#define  ARB_BP_CAP_STATUS_RSP_SHIFT	10
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+#define  ARB_BP_CAP_STATUS_MASK		GENMASK(1, 0)
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+#define  ARB_BP_CAP_STATUS_BS_SHIFT	2
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+#define  ARB_BP_CAP_STATUS_WRITE	(1 << 1)
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+#define  ARB_BP_CAP_STATUS_VALID	(1 << 0)
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+
4142 enum {
4243 	ARB_TIMER,
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+	ARB_BP_CAP_CLR,
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+	ARB_BP_CAP_HI_ADDR,
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+	ARB_BP_CAP_ADDR,
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+	ARB_BP_CAP_STATUS,
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+	ARB_BP_CAP_MASTER,
4349 	ARB_ERR_CAP_CLR,
4450 	ARB_ERR_CAP_HI_ADDR,
4551 	ARB_ERR_CAP_ADDR,
....@@ -49,6 +55,11 @@
4955 
5056 static const int gisb_offsets_bcm7038[] = {
5157 	[ARB_TIMER]		= 0x00c,
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+	[ARB_BP_CAP_CLR]	= 0x014,
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+	[ARB_BP_CAP_HI_ADDR]	= -1,
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+	[ARB_BP_CAP_ADDR]	= 0x0b8,
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+	[ARB_BP_CAP_STATUS]	= 0x0c0,
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+	[ARB_BP_CAP_MASTER]	= -1,
5263 	[ARB_ERR_CAP_CLR]	= 0x0c4,
5364 	[ARB_ERR_CAP_HI_ADDR]	= -1,
5465 	[ARB_ERR_CAP_ADDR]	= 0x0c8,
....@@ -58,6 +69,11 @@
5869 
5970 static const int gisb_offsets_bcm7278[] = {
6071 	[ARB_TIMER]		= 0x008,
72
+	[ARB_BP_CAP_CLR]	= 0x01c,
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+	[ARB_BP_CAP_HI_ADDR]	= -1,
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+	[ARB_BP_CAP_ADDR]	= 0x220,
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+	[ARB_BP_CAP_STATUS]	= 0x230,
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+	[ARB_BP_CAP_MASTER]	= 0x234,
6177 	[ARB_ERR_CAP_CLR]	= 0x7f8,
6278 	[ARB_ERR_CAP_HI_ADDR]	= -1,
6379 	[ARB_ERR_CAP_ADDR]	= 0x7e0,
....@@ -67,6 +83,11 @@
6783 
6884 static const int gisb_offsets_bcm7400[] = {
6985 	[ARB_TIMER]		= 0x00c,
86
+	[ARB_BP_CAP_CLR]	= 0x014,
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+	[ARB_BP_CAP_HI_ADDR]	= -1,
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+	[ARB_BP_CAP_ADDR]	= 0x0b8,
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+	[ARB_BP_CAP_STATUS]	= 0x0c0,
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+	[ARB_BP_CAP_MASTER]	= 0x0c4,
7091 	[ARB_ERR_CAP_CLR]	= 0x0c8,
7192 	[ARB_ERR_CAP_HI_ADDR]	= -1,
7293 	[ARB_ERR_CAP_ADDR]	= 0x0cc,
....@@ -76,6 +97,11 @@
7697 
7798 static const int gisb_offsets_bcm7435[] = {
7899 	[ARB_TIMER]		= 0x00c,
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+	[ARB_BP_CAP_CLR]	= 0x014,
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+	[ARB_BP_CAP_HI_ADDR]	= -1,
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+	[ARB_BP_CAP_ADDR]	= 0x158,
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+	[ARB_BP_CAP_STATUS]	= 0x160,
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+	[ARB_BP_CAP_MASTER]	= 0x164,
79105 	[ARB_ERR_CAP_CLR]	= 0x168,
80106 	[ARB_ERR_CAP_HI_ADDR]	= -1,
81107 	[ARB_ERR_CAP_ADDR]	= 0x16c,
....@@ -85,6 +111,11 @@
85111 
86112 static const int gisb_offsets_bcm7445[] = {
87113 	[ARB_TIMER]		= 0x008,
114
+	[ARB_BP_CAP_CLR]	= 0x010,
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+	[ARB_BP_CAP_HI_ADDR]	= -1,
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+	[ARB_BP_CAP_ADDR]	= 0x1d8,
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+	[ARB_BP_CAP_STATUS]	= 0x1e0,
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+	[ARB_BP_CAP_MASTER]	= 0x1e4,
88119 	[ARB_ERR_CAP_CLR]	= 0x7e4,
89120 	[ARB_ERR_CAP_HI_ADDR]	= 0x7e8,
90121 	[ARB_ERR_CAP_ADDR]	= 0x7ec,
....@@ -133,6 +164,16 @@
133164 	return value;
134165 }
135166 
167
+static u64 gisb_read_bp_address(struct brcmstb_gisb_arb_device *gdev)
168
+{
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+	u64 value;
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+
171
+	value = gisb_read(gdev, ARB_BP_CAP_ADDR);
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+	value |= (u64)gisb_read(gdev, ARB_BP_CAP_HI_ADDR) << 32;
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+
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+	return value;
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+}
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+
136177 static void gisb_write(struct brcmstb_gisb_arb_device *gdev, u32 val, int reg)
137178 {
138179 	int offset = gdev->gisb_offsets[reg];
....@@ -150,8 +191,7 @@
150191 				    struct device_attribute *attr,
151192 				    char *buf)
152193 {
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-	struct platform_device *pdev = to_platform_device(dev);
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-	struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
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+	struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
155195 	u32 timeout;
156196 
157197 	mutex_lock(&gdev->lock);
....@@ -165,8 +205,7 @@
165205 				    struct device_attribute *attr,
166206 				    const char *buf, size_t count)
167207 {
168
-	struct platform_device *pdev = to_platform_device(dev);
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-	struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
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+	struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
170209 	int val, ret;
171210 
172211 	ret = kstrtoint(buf, 10, &val);
....@@ -220,8 +259,8 @@
220259 		m_name = m_fmt;
221260 	}
222261 
223
-	pr_crit("%s: %s at 0x%llx [%c %s], core: %s\n",
224
-		__func__, reason, arb_addr,
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+	pr_crit("GISB: %s at 0x%llx [%c %s], core: %s\n",
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+		reason, arb_addr,
225264 		cap_status & ARB_ERR_CAP_STATUS_WRITE ? 'W' : 'R',
226265 		cap_status & ARB_ERR_CAP_STATUS_TIMEOUT ? "timeout" : "",
227266 		m_name);
....@@ -265,6 +304,41 @@
265304 static irqreturn_t brcmstb_gisb_tea_handler(int irq, void *dev_id)
266305 {
267306 	brcmstb_gisb_arb_decode_addr(dev_id, "target abort");
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+
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+	return IRQ_HANDLED;
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+}
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+
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+static irqreturn_t brcmstb_gisb_bp_handler(int irq, void *dev_id)
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+{
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+	struct brcmstb_gisb_arb_device *gdev = dev_id;
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+	const char *m_name;
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+	u32 bp_status;
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+	u64 arb_addr;
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+	u32 master;
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+	char m_fmt[11];
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+
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+	bp_status = gisb_read(gdev, ARB_BP_CAP_STATUS);
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+
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+	/* Invalid captured address, bail out */
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+	if (!(bp_status & ARB_BP_CAP_STATUS_VALID))
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+		return IRQ_HANDLED;
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+
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+	/* Read the address and master */
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+	arb_addr = gisb_read_bp_address(gdev);
328
+	master = gisb_read(gdev, ARB_BP_CAP_MASTER);
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+
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+	m_name = brcmstb_gisb_master_to_str(gdev, master);
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+	if (!m_name) {
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+		snprintf(m_fmt, sizeof(m_fmt), "0x%08x", master);
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+		m_name = m_fmt;
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+	}
335
+
336
+	pr_crit("GISB: breakpoint at 0x%llx [%c], core: %s\n",
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+		arb_addr, bp_status & ARB_BP_CAP_STATUS_WRITE ? 'W' : 'R',
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+		m_name);
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+
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+	/* clear the GISB error */
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+	gisb_write(gdev, ARB_ERR_CAP_CLEAR, ARB_ERR_CAP_CLR);
268342 
269343 	return IRQ_HANDLED;
270344 }
....@@ -327,13 +401,14 @@
327401 	struct brcmstb_gisb_arb_device *gdev;
328402 	const struct of_device_id *of_id;
329403 	struct resource *r;
330
-	int err, timeout_irq, tea_irq;
404
+	int err, timeout_irq, tea_irq, bp_irq;
331405 	unsigned int num_masters, j = 0;
332406 	int i, first, last;
333407 
334408 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
335409 	timeout_irq = platform_get_irq(pdev, 0);
336410 	tea_irq = platform_get_irq(pdev, 1);
411
+	bp_irq = platform_get_irq(pdev, 2);
337412 
338413 	gdev = devm_kzalloc(&pdev->dev, sizeof(*gdev), GFP_KERNEL);
339414 	if (!gdev)
....@@ -365,6 +440,15 @@
365440 				gdev);
366441 	if (err < 0)
367442 		return err;
443
+
444
+	/* Interrupt is optional */
445
+	if (bp_irq > 0) {
446
+		err = devm_request_irq(&pdev->dev, bp_irq,
447
+				       brcmstb_gisb_bp_handler, 0, pdev->name,
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+				       gdev);
449
+		if (err < 0)
450
+			return err;
451
+	}
368452 
369453 	/* If we do not have a valid mask, assume all masters are enabled */
370454 	if (of_property_read_u32(dn, "brcm,gisb-arb-master-mask",
....@@ -409,8 +493,8 @@
409493 					       &gisb_panic_notifier);
410494 	}
411495 
412
-	dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n",
413
-			gdev->base, timeout_irq, tea_irq);
496
+	dev_info(&pdev->dev, "registered irqs: %d, %d\n",
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+		 timeout_irq, tea_irq);
414498 
415499 	return 0;
416500 }
....@@ -418,8 +502,7 @@
418502 #ifdef CONFIG_PM_SLEEP
419503 static int brcmstb_gisb_arb_suspend(struct device *dev)
420504 {
421
-	struct platform_device *pdev = to_platform_device(dev);
422
-	struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
505
+	struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
423506 
424507 	gdev->saved_timeout = gisb_read(gdev, ARB_TIMER);
425508 
....@@ -431,8 +514,7 @@
431514  */
432515 static int brcmstb_gisb_arb_resume_noirq(struct device *dev)
433516 {
434
-	struct platform_device *pdev = to_platform_device(dev);
435
-	struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
517
+	struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
436518 
437519 	gisb_write(gdev, gdev->saved_timeout, ARB_TIMER);
438520