watchdog: octeon-wdt: Add support for 78XX SOCs.

Signed-off-by: Carlos Munoz <carlos.munoz@caviumnetworks.com>
Signed-off-by: Steven J. Hill <steven.hill@cavium.com>
Acked-by: David Daney <david.daney@cavium.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Cc: linux-mips@linux-mips.org
Cc: linux-watchdog@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17214/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

drivers/watchdog/octeon-wdt-main.c

@@ -70,6 +70,10 @@
 #include <asm/octeon/octeon.h>
 #include <asm/octeon/cvmx-boot-vector.h>
 #include <asm/octeon/cvmx-ciu2-defs.h>
+#include <asm/octeon/cvmx-rst-defs.h>
+
+/* Watchdog interrupt major block number (8 MSBs of intsn) */
+#define WD_BLOCK_NUMBER		0x01
 
 static int divisor;
 
@@ -91,6 +95,8 @@ static cpumask_t irq_enabled_cpus;
 
 #define WD_TIMO 60			/* Default heartbeat = 60 seconds */
 
+#define CVMX_GSERX_SCRATCH(offset) (CVMX_ADD_IO_SEG(0x0001180090000020ull) + ((offset) & 15) * 0x1000000ull)
+
 static int heartbeat = WD_TIMO;
 module_param(heartbeat, int, 0444);
 MODULE_PARM_DESC(heartbeat,
@@ -115,21 +121,12 @@ void octeon_wdt_nmi_stage2(void);
 static int cpu2core(int cpu)
 {
 #ifdef CONFIG_SMP
-	return cpu_logical_map(cpu);
+	return cpu_logical_map(cpu) & 0x3f;
 #else
 	return cvmx_get_core_num();
 #endif
 }
 
-static int core2cpu(int coreid)
-{
-#ifdef CONFIG_SMP
-	return cpu_number_map(coreid);
-#else
-	return 0;
-#endif
-}
-
 /**
  * Poke the watchdog when an interrupt is received
  *
@@ -140,13 +137,14 @@ static int core2cpu(int coreid)
  */
 static irqreturn_t octeon_wdt_poke_irq(int cpl, void *dev_id)
 {
-	unsigned int core = cvmx_get_core_num();
+	int cpu = raw_smp_processor_id();
-	int cpu = core2cpu(core);
+	unsigned int core = cpu2core(cpu);
+	int node = cpu_to_node(cpu);
 
 	if (do_countdown) {
 		if (per_cpu_countdown[cpu] > 0) {
 			/* We're alive, poke the watchdog */
-			cvmx_write_csr(CVMX_CIU_PP_POKEX(core), 1);
+			cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(core), 1);
 			per_cpu_countdown[cpu]--;
 		} else {
 			/* Bad news, you are about to reboot. */
@@ -155,7 +153,7 @@ static irqreturn_t octeon_wdt_poke_irq(int cpl, void *dev_id)
 		}
 	} else {
 		/* Not open, just ping away... */
-		cvmx_write_csr(CVMX_CIU_PP_POKEX(core), 1);
+		cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(core), 1);
 	}
 	return IRQ_HANDLED;
 }
@@ -280,26 +278,74 @@ void octeon_wdt_nmi_stage3(u64 reg[32])
 	}
 
 	octeon_wdt_write_string("*** Chip soft reset soon ***\r\n");
+
+	/*
+	 * G-30204: We must trigger a soft reset before watchdog
+	 * does an incomplete job of doing it.
+	 */
+	if (OCTEON_IS_OCTEON3() && !OCTEON_IS_MODEL(OCTEON_CN70XX)) {
+		u64 scr;
+		unsigned int node = cvmx_get_node_num();
+		unsigned int lcore = cvmx_get_local_core_num();
+		union cvmx_ciu_wdogx ciu_wdog;
+
+		/*
+		 * Wait for other cores to print out information, but
+		 * not too long.  Do the soft reset before watchdog
+		 * can trigger it.
+		 */
+		do {
+			ciu_wdog.u64 = cvmx_read_csr_node(node, CVMX_CIU_WDOGX(lcore));
+		} while (ciu_wdog.s.cnt > 0x10000);
+
+		scr = cvmx_read_csr_node(0, CVMX_GSERX_SCRATCH(0));
+		scr |= 1 << 11; /* Indicate watchdog in bit 11 */
+		cvmx_write_csr_node(0, CVMX_GSERX_SCRATCH(0), scr);
+		cvmx_write_csr_node(0, CVMX_RST_SOFT_RST, 1);
+	}
+}
+
+static int octeon_wdt_cpu_to_irq(int cpu)
+{
+	unsigned int coreid;
+	int node;
+	int irq;
+
+	coreid = cpu2core(cpu);
+	node = cpu_to_node(cpu);
+
+	if (octeon_has_feature(OCTEON_FEATURE_CIU3)) {
+		struct irq_domain *domain;
+		int hwirq;
+
+		domain = octeon_irq_get_block_domain(node,
+						     WD_BLOCK_NUMBER);
+		hwirq = WD_BLOCK_NUMBER << 12 | 0x200 | coreid;
+		irq = irq_find_mapping(domain, hwirq);
+	} else {
+		irq = OCTEON_IRQ_WDOG0 + coreid;
+	}
+	return irq;
 }
 
 static int octeon_wdt_cpu_pre_down(unsigned int cpu)
 {
 	unsigned int core;
-	unsigned int irq;
+	int node;
 	union cvmx_ciu_wdogx ciu_wdog;
 
 	core = cpu2core(cpu);
 
-	irq = OCTEON_IRQ_WDOG0 + core;
+	node = cpu_to_node(cpu);
 
 	/* Poke the watchdog to clear out its state */
-	cvmx_write_csr(CVMX_CIU_PP_POKEX(core), 1);
+	cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(core), 1);
 
 	/* Disable the hardware. */
 	ciu_wdog.u64 = 0;
-	cvmx_write_csr(CVMX_CIU_WDOGX(core), ciu_wdog.u64);
+	cvmx_write_csr_node(node, CVMX_CIU_WDOGX(core), ciu_wdog.u64);
 
-	free_irq(irq, octeon_wdt_poke_irq);
+	free_irq(octeon_wdt_cpu_to_irq(cpu), octeon_wdt_poke_irq);
 	return 0;
 }
 
@@ -308,33 +354,56 @@ static int octeon_wdt_cpu_online(unsigned int cpu)
 	unsigned int core;
 	unsigned int irq;
 	union cvmx_ciu_wdogx ciu_wdog;
+	int node;
+	struct irq_domain *domain;
+	int hwirq;
 
 	core = cpu2core(cpu);
+	node = cpu_to_node(cpu);
 
 	octeon_wdt_bootvector[core].target_ptr = (u64)octeon_wdt_nmi_stage2;
 
 	/* Disable it before doing anything with the interrupts. */
 	ciu_wdog.u64 = 0;
-	cvmx_write_csr(CVMX_CIU_WDOGX(core), ciu_wdog.u64);
+	cvmx_write_csr_node(node, CVMX_CIU_WDOGX(core), ciu_wdog.u64);
 
 	per_cpu_countdown[cpu] = countdown_reset;
 
-	irq = OCTEON_IRQ_WDOG0 + core;
+	if (octeon_has_feature(OCTEON_FEATURE_CIU3)) {
+		/* Must get the domain for the watchdog block */
+		domain = octeon_irq_get_block_domain(node, WD_BLOCK_NUMBER);
+
+		/* Get a irq for the wd intsn (hardware interrupt) */
+		hwirq = WD_BLOCK_NUMBER << 12 | 0x200 | core;
+		irq = irq_create_mapping(domain, hwirq);
+		irqd_set_trigger_type(irq_get_irq_data(irq),
+				      IRQ_TYPE_EDGE_RISING);
+	} else
+		irq = OCTEON_IRQ_WDOG0 + core;
 
 	if (request_irq(irq, octeon_wdt_poke_irq,
 			IRQF_NO_THREAD, "octeon_wdt", octeon_wdt_poke_irq))
 		panic("octeon_wdt: Couldn't obtain irq %d", irq);
 
+	/* Must set the irq affinity here */
+	if (octeon_has_feature(OCTEON_FEATURE_CIU3)) {
+		cpumask_t mask;
+
+		cpumask_clear(&mask);
+		cpumask_set_cpu(cpu, &mask);
+		irq_set_affinity(irq, &mask);
+	}
+
 	cpumask_set_cpu(cpu, &irq_enabled_cpus);
 
 	/* Poke the watchdog to clear out its state */
-	cvmx_write_csr(CVMX_CIU_PP_POKEX(core), 1);
+	cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(core), 1);
 
 	/* Finally enable the watchdog now that all handlers are installed */
 	ciu_wdog.u64 = 0;
 	ciu_wdog.s.len = timeout_cnt;
 	ciu_wdog.s.mode = 3;	/* 3 = Interrupt + NMI + Soft-Reset */
-	cvmx_write_csr(CVMX_CIU_WDOGX(core), ciu_wdog.u64);
+	cvmx_write_csr_node(node, CVMX_CIU_WDOGX(core), ciu_wdog.u64);
 
 	return 0;
 }
@@ -343,20 +412,20 @@ static int octeon_wdt_ping(struct watchdog_device __always_unused *wdog)
 {
 	int cpu;
 	int coreid;
+	int node;
 
 	if (disable)
 		return 0;
 
 	for_each_online_cpu(cpu) {
 		coreid = cpu2core(cpu);
-		cvmx_write_csr(CVMX_CIU_PP_POKEX(coreid), 1);
+		node = cpu_to_node(cpu);
+		cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(coreid), 1);
 		per_cpu_countdown[cpu] = countdown_reset;
 		if ((countdown_reset || !do_countdown) &&
 		    !cpumask_test_cpu(cpu, &irq_enabled_cpus)) {
 			/* We have to enable the irq */
-			int irq = OCTEON_IRQ_WDOG0 + coreid;
+			enable_irq(octeon_wdt_cpu_to_irq(cpu));
-
-			enable_irq(irq);
 			cpumask_set_cpu(cpu, &irq_enabled_cpus);
 		}
 	}
@@ -395,6 +464,7 @@ static int octeon_wdt_set_timeout(struct watchdog_device *wdog,
 	int cpu;
 	int coreid;
 	union cvmx_ciu_wdogx ciu_wdog;
+	int node;
 
 	if (t <= 0)
 		return -1;
@@ -406,12 +476,13 @@ static int octeon_wdt_set_timeout(struct watchdog_device *wdog,
 
 	for_each_online_cpu(cpu) {
 		coreid = cpu2core(cpu);
-		cvmx_write_csr(CVMX_CIU_PP_POKEX(coreid), 1);
+		node = cpu_to_node(cpu);
+		cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(coreid), 1);
 		ciu_wdog.u64 = 0;
 		ciu_wdog.s.len = timeout_cnt;
 		ciu_wdog.s.mode = 3;	/* 3 = Interrupt + NMI + Soft-Reset */
-		cvmx_write_csr(CVMX_CIU_WDOGX(coreid), ciu_wdog.u64);
+		cvmx_write_csr_node(node, CVMX_CIU_WDOGX(coreid), ciu_wdog.u64);
-		cvmx_write_csr(CVMX_CIU_PP_POKEX(coreid), 1);
+		cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(coreid), 1);
 	}
 	octeon_wdt_ping(wdog); /* Get the irqs back on. */
 	return 0;
@@ -467,6 +538,8 @@ static int __init octeon_wdt_init(void)
 
 	if (OCTEON_IS_MODEL(OCTEON_CN68XX))
 		divisor = 0x200;
+	else if (OCTEON_IS_MODEL(OCTEON_CN78XX))
+		divisor = 0x400;
 	else
 		divisor = 0x100;