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path: root/drivers/watchdog/octeon-wdt-main.c
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Diffstat (limited to 'drivers/watchdog/octeon-wdt-main.c')
-rw-r--r--drivers/watchdog/octeon-wdt-main.c354
1 files changed, 175 insertions, 179 deletions
diff --git a/drivers/watchdog/octeon-wdt-main.c b/drivers/watchdog/octeon-wdt-main.c
index b5cdceb36cff..0ec419a3f7ed 100644
--- a/drivers/watchdog/octeon-wdt-main.c
+++ b/drivers/watchdog/octeon-wdt-main.c
@@ -1,7 +1,7 @@
/*
* Octeon Watchdog driver
*
- * Copyright (C) 2007, 2008, 2009, 2010 Cavium Networks
+ * Copyright (C) 2007-2017 Cavium, Inc.
*
* Converted to use WATCHDOG_CORE by Aaro Koskinen <aaro.koskinen@iki.fi>.
*
@@ -59,20 +59,23 @@
#include <linux/interrupt.h>
#include <linux/watchdog.h>
#include <linux/cpumask.h>
-#include <linux/bitops.h>
-#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/string.h>
#include <linux/delay.h>
#include <linux/cpu.h>
-#include <linux/smp.h>
-#include <linux/fs.h>
#include <linux/irq.h>
#include <asm/mipsregs.h>
#include <asm/uasm.h>
#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;
/* The count needed to achieve timeout_sec. */
static unsigned int timeout_cnt;
@@ -84,7 +87,7 @@ static unsigned int max_timeout_sec;
static unsigned int timeout_sec;
/* Set to non-zero when userspace countdown mode active */
-static int do_coundown;
+static bool do_countdown;
static unsigned int countdown_reset;
static unsigned int per_cpu_countdown[NR_CPUS];
@@ -92,152 +95,38 @@ 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, S_IRUGO);
+module_param(heartbeat, int, 0444);
MODULE_PARM_DESC(heartbeat,
"Watchdog heartbeat in seconds. (0 < heartbeat, default="
__MODULE_STRING(WD_TIMO) ")");
static bool nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, bool, S_IRUGO);
+module_param(nowayout, bool, 0444);
MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-static u32 nmi_stage1_insns[64] __initdata;
-/* We need one branch and therefore one relocation per target label. */
-static struct uasm_label labels[5] __initdata;
-static struct uasm_reloc relocs[5] __initdata;
-
-enum lable_id {
- label_enter_bootloader = 1
-};
+static int disable;
+module_param(disable, int, 0444);
+MODULE_PARM_DESC(disable,
+ "Disable the watchdog entirely (default=0)");
-/* Some CP0 registers */
-#define K0 26
-#define C0_CVMMEMCTL 11, 7
-#define C0_STATUS 12, 0
-#define C0_EBASE 15, 1
-#define C0_DESAVE 31, 0
+static struct cvmx_boot_vector_element *octeon_wdt_bootvector;
void octeon_wdt_nmi_stage2(void);
-static void __init octeon_wdt_build_stage1(void)
-{
- int i;
- int len;
- u32 *p = nmi_stage1_insns;
-#ifdef CONFIG_HOTPLUG_CPU
- struct uasm_label *l = labels;
- struct uasm_reloc *r = relocs;
-#endif
-
- /*
- * For the next few instructions running the debugger may
- * cause corruption of k0 in the saved registers. Since we're
- * about to crash, nobody probably cares.
- *
- * Save K0 into the debug scratch register
- */
- uasm_i_dmtc0(&p, K0, C0_DESAVE);
-
- uasm_i_mfc0(&p, K0, C0_STATUS);
-#ifdef CONFIG_HOTPLUG_CPU
- if (octeon_bootloader_entry_addr)
- uasm_il_bbit0(&p, &r, K0, ilog2(ST0_NMI),
- label_enter_bootloader);
-#endif
- /* Force 64-bit addressing enabled */
- uasm_i_ori(&p, K0, K0, ST0_UX | ST0_SX | ST0_KX);
- uasm_i_mtc0(&p, K0, C0_STATUS);
-
-#ifdef CONFIG_HOTPLUG_CPU
- if (octeon_bootloader_entry_addr) {
- uasm_i_mfc0(&p, K0, C0_EBASE);
- /* Coreid number in K0 */
- uasm_i_andi(&p, K0, K0, 0xf);
- /* 8 * coreid in bits 16-31 */
- uasm_i_dsll_safe(&p, K0, K0, 3 + 16);
- uasm_i_ori(&p, K0, K0, 0x8001);
- uasm_i_dsll_safe(&p, K0, K0, 16);
- uasm_i_ori(&p, K0, K0, 0x0700);
- uasm_i_drotr_safe(&p, K0, K0, 32);
- /*
- * Should result in: 0x8001,0700,0000,8*coreid which is
- * CVMX_CIU_WDOGX(coreid) - 0x0500
- *
- * Now ld K0, CVMX_CIU_WDOGX(coreid)
- */
- uasm_i_ld(&p, K0, 0x500, K0);
- /*
- * If bit one set handle the NMI as a watchdog event.
- * otherwise transfer control to bootloader.
- */
- uasm_il_bbit0(&p, &r, K0, 1, label_enter_bootloader);
- uasm_i_nop(&p);
- }
-#endif
-
- /* Clear Dcache so cvmseg works right. */
- uasm_i_cache(&p, 1, 0, 0);
-
- /* Use K0 to do a read/modify/write of CVMMEMCTL */
- uasm_i_dmfc0(&p, K0, C0_CVMMEMCTL);
- /* Clear out the size of CVMSEG */
- uasm_i_dins(&p, K0, 0, 0, 6);
- /* Set CVMSEG to its largest value */
- uasm_i_ori(&p, K0, K0, 0x1c0 | 54);
- /* Store the CVMMEMCTL value */
- uasm_i_dmtc0(&p, K0, C0_CVMMEMCTL);
-
- /* Load the address of the second stage handler */
- UASM_i_LA(&p, K0, (long)octeon_wdt_nmi_stage2);
- uasm_i_jr(&p, K0);
- uasm_i_dmfc0(&p, K0, C0_DESAVE);
-
-#ifdef CONFIG_HOTPLUG_CPU
- if (octeon_bootloader_entry_addr) {
- uasm_build_label(&l, p, label_enter_bootloader);
- /* Jump to the bootloader and restore K0 */
- UASM_i_LA(&p, K0, (long)octeon_bootloader_entry_addr);
- uasm_i_jr(&p, K0);
- uasm_i_dmfc0(&p, K0, C0_DESAVE);
- }
-#endif
- uasm_resolve_relocs(relocs, labels);
-
- len = (int)(p - nmi_stage1_insns);
- pr_debug("Synthesized NMI stage 1 handler (%d instructions)\n", len);
-
- pr_debug("\t.set push\n");
- pr_debug("\t.set noreorder\n");
- for (i = 0; i < len; i++)
- pr_debug("\t.word 0x%08x\n", nmi_stage1_insns[i]);
- pr_debug("\t.set pop\n");
-
- if (len > 32)
- panic("NMI stage 1 handler exceeds 32 instructions, was %d\n",
- len);
-}
-
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
*
@@ -248,13 +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 = core2cpu(core);
+ int cpu = raw_smp_processor_id();
+ unsigned int core = cpu2core(cpu);
+ int node = cpu_to_node(cpu);
- if (do_coundown) {
+ 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. */
@@ -263,7 +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;
}
@@ -338,10 +228,10 @@ void octeon_wdt_nmi_stage3(u64 reg[32])
u64 cp0_epc = read_c0_epc();
/* Delay so output from all cores output is not jumbled together. */
- __delay(100000000ull * coreid);
+ udelay(85000 * coreid);
octeon_wdt_write_string("\r\n*** NMI Watchdog interrupt on Core 0x");
- octeon_wdt_write_hex(coreid, 1);
+ octeon_wdt_write_hex(coreid, 2);
octeon_wdt_write_string(" ***\r\n");
for (i = 0; i < 32; i++) {
octeon_wdt_write_string("\t");
@@ -364,33 +254,98 @@ void octeon_wdt_nmi_stage3(u64 reg[32])
octeon_wdt_write_hex(cp0_cause, 16);
octeon_wdt_write_string("\r\n");
- octeon_wdt_write_string("\tsum0\t0x");
- octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU_INTX_SUM0(coreid * 2)), 16);
- octeon_wdt_write_string("\ten0\t0x");
- octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)), 16);
- octeon_wdt_write_string("\r\n");
+ /* The CIU register is different for each Octeon model. */
+ if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
+ octeon_wdt_write_string("\tsrc_wd\t0x");
+ octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_SRC_PPX_IP2_WDOG(coreid)), 16);
+ octeon_wdt_write_string("\ten_wd\t0x");
+ octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_EN_PPX_IP2_WDOG(coreid)), 16);
+ octeon_wdt_write_string("\r\n");
+ octeon_wdt_write_string("\tsrc_rml\t0x");
+ octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_SRC_PPX_IP2_RML(coreid)), 16);
+ octeon_wdt_write_string("\ten_rml\t0x");
+ octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_EN_PPX_IP2_RML(coreid)), 16);
+ octeon_wdt_write_string("\r\n");
+ octeon_wdt_write_string("\tsum\t0x");
+ octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_SUM_PPX_IP2(coreid)), 16);
+ octeon_wdt_write_string("\r\n");
+ } else if (!octeon_has_feature(OCTEON_FEATURE_CIU3)) {
+ octeon_wdt_write_string("\tsum0\t0x");
+ octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU_INTX_SUM0(coreid * 2)), 16);
+ octeon_wdt_write_string("\ten0\t0x");
+ octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)), 16);
+ octeon_wdt_write_string("\r\n");
+ }
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;
}
@@ -399,31 +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;
}
@@ -432,17 +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_coundown) &&
+ 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(irq);
+ enable_irq(octeon_wdt_cpu_to_irq(cpu));
cpumask_set_cpu(cpu, &irq_enabled_cpus);
}
}
@@ -472,7 +455,7 @@ static void octeon_wdt_calc_parameters(int t)
countdown_reset = periods > 2 ? periods - 2 : 0;
heartbeat = t;
- timeout_cnt = ((octeon_get_io_clock_rate() >> 8) * timeout_sec) >> 8;
+ timeout_cnt = ((octeon_get_io_clock_rate() / divisor) * timeout_sec) >> 8;
}
static int octeon_wdt_set_timeout(struct watchdog_device *wdog,
@@ -481,20 +464,25 @@ 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;
octeon_wdt_calc_parameters(t);
+ 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);
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(CVMX_CIU_PP_POKEX(coreid), 1);
+ cvmx_write_csr_node(node, CVMX_CIU_WDOGX(coreid), ciu_wdog.u64);
+ cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(coreid), 1);
}
octeon_wdt_ping(wdog); /* Get the irqs back on. */
return 0;
@@ -503,13 +491,13 @@ static int octeon_wdt_set_timeout(struct watchdog_device *wdog,
static int octeon_wdt_start(struct watchdog_device *wdog)
{
octeon_wdt_ping(wdog);
- do_coundown = 1;
+ do_countdown = 1;
return 0;
}
static int octeon_wdt_stop(struct watchdog_device *wdog)
{
- do_coundown = 0;
+ do_countdown = 0;
octeon_wdt_ping(wdog);
return 0;
}
@@ -540,14 +528,25 @@ static enum cpuhp_state octeon_wdt_online;
*/
static int __init octeon_wdt_init(void)
{
- int i;
int ret;
- u64 *ptr;
+
+ octeon_wdt_bootvector = cvmx_boot_vector_get();
+ if (!octeon_wdt_bootvector) {
+ pr_err("Error: Cannot allocate boot vector.\n");
+ return -ENOMEM;
+ }
+
+ if (OCTEON_IS_MODEL(OCTEON_CN68XX))
+ divisor = 0x200;
+ else if (OCTEON_IS_MODEL(OCTEON_CN78XX))
+ divisor = 0x400;
+ else
+ divisor = 0x100;
/*
* Watchdog time expiration length = The 16 bits of LEN
* represent the most significant bits of a 24 bit decrementer
- * that decrements every 256 cycles.
+ * that decrements every divisor cycle.
*
* Try for a timeout of 5 sec, if that fails a smaller number
* of even seconds,
@@ -555,8 +554,7 @@ static int __init octeon_wdt_init(void)
max_timeout_sec = 6;
do {
max_timeout_sec--;
- timeout_cnt = ((octeon_get_io_clock_rate() >> 8) *
- max_timeout_sec) >> 8;
+ timeout_cnt = ((octeon_get_io_clock_rate() / divisor) * max_timeout_sec) >> 8;
} while (timeout_cnt > 65535);
BUG_ON(timeout_cnt == 0);
@@ -576,16 +574,10 @@ static int __init octeon_wdt_init(void)
return ret;
}
- /* Build the NMI handler ... */
- octeon_wdt_build_stage1();
-
- /* ... and install it. */
- ptr = (u64 *) nmi_stage1_insns;
- for (i = 0; i < 16; i++) {
- cvmx_write_csr(CVMX_MIO_BOOT_LOC_ADR, i * 8);
- cvmx_write_csr(CVMX_MIO_BOOT_LOC_DAT, ptr[i]);
+ if (disable) {
+ pr_notice("disabled\n");
+ return 0;
}
- cvmx_write_csr(CVMX_MIO_BOOT_LOC_CFGX(0), 0x81fc0000);
cpumask_clear(&irq_enabled_cpus);
@@ -607,6 +599,10 @@ err:
static void __exit octeon_wdt_cleanup(void)
{
watchdog_unregister_device(&octeon_wdt);
+
+ if (disable)
+ return;
+
cpuhp_remove_state(octeon_wdt_online);
/*
@@ -617,7 +613,7 @@ static void __exit octeon_wdt_cleanup(void)
}
MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Cavium Networks <support@caviumnetworks.com>");
-MODULE_DESCRIPTION("Cavium Networks Octeon Watchdog driver.");
+MODULE_AUTHOR("Cavium Inc. <support@cavium.com>");
+MODULE_DESCRIPTION("Cavium Inc. OCTEON Watchdog driver.");
module_init(octeon_wdt_init);
module_exit(octeon_wdt_cleanup);
generated by cgit (git 2.34.1) at 2024-05-02 09:23:08 +0000