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Date: Wed, 11 May 2022 16:30:05 +0800
From: Qing Zhang <zhangqing@...ngson.cn>
To: Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
linux-kernel@...r.kernel.org, yangtiezhu@...ngson.cn,
zhangqing@...ngson.cn
Subject: [PATCH 1/3] MIPS: Loongson64: Add Loongson-2K1000 SMP support
Add SMP part of dt parsing about Loongson-2K1000 to multiplex
loongson3_smp_ops, CONFIG_NUMA is not currently supported,
so of_numa is not used to parse relevant information.
Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
---
arch/mips/loongson64/env.c | 3 +
arch/mips/loongson64/smp.c | 130 +++++++++++++++++++++++++++++++++++--
2 files changed, 129 insertions(+), 4 deletions(-)
diff --git a/arch/mips/loongson64/env.c b/arch/mips/loongson64/env.c
index c961e2999f15..90552f6b00ca 100644
--- a/arch/mips/loongson64/env.c
+++ b/arch/mips/loongson64/env.c
@@ -52,6 +52,9 @@ void __init prom_dtb_init_env(void)
loongson_fdt_blob = __dtb_loongson64_2core_2k1000_begin;
else
loongson_fdt_blob = (void *)fw_arg2;
+
+ loongson_sysconf.dma_mask_bits = 32;
+ loongson_sysconf.workarounds = WORKAROUND_CPUHOTPLUG;
}
void __init prom_lefi_init_env(void)
diff --git a/arch/mips/loongson64/smp.c b/arch/mips/loongson64/smp.c
index 660e1de4412a..a7d2ad87bae0 100644
--- a/arch/mips/loongson64/smp.c
+++ b/arch/mips/loongson64/smp.c
@@ -13,6 +13,7 @@
#include <linux/smp.h>
#include <linux/cpufreq.h>
#include <linux/kexec.h>
+#include <linux/of_address.h>
#include <asm/processor.h>
#include <asm/time.h>
#include <asm/tlbflush.h>
@@ -476,10 +477,59 @@ static void loongson3_smp_finish(void)
smp_processor_id(), read_c0_status());
}
+#define INVALID_HWID ULONG_MAX
+static void parse_dt_cpus_init(void)
+{
+ struct device_node *dn, *np;
+ int i, hwids[NR_CPUS];
+ u64 hwid;
+
+ for_each_of_cpu_node(dn) {
+ hwid = of_get_cpu_hwid(dn, 0);
+ if (hwid >= INVALID_HWID)
+ continue;
+
+ for (i = 0; i < loongson_sysconf.nr_cpus; i++) {
+ if (hwids[i] == hwid) {
+ pr_err("%pOF: duplicate cpu reg properties in the DT\n", dn);
+ continue;
+ }
+ }
+
+ if (loongson_sysconf.nr_cpus >= NR_CPUS)
+ break;
+
+ hwids[loongson_sysconf.nr_cpus] = hwid;
+ loongson_sysconf.nr_cpus++;
+
+ np = of_find_compatible_node(NULL, NULL, "loongson, mmio-ipi");
+ if (!np) {
+ pr_info("Failed to get ipi node\n");
+ return;
+ }
+
+ smp_group[0] = (unsigned long long)of_iomap(np, 0);
+ if (!smp_group[0]) {
+ pr_info("Failed to map ipi register base address\n");
+ return;
+ }
+ }
+
+ of_node_put(np);
+ loongson_sysconf.reserved_cpus_mask = 0;
+ loongson_sysconf.boot_cpu_id = 0;
+ loongson_sysconf.nr_nodes = 1;
+ loongson_sysconf.cores_per_node = loongson_sysconf.nr_cpus;
+ loongson_sysconf.cores_per_package = loongson_sysconf.nr_cpus;
+}
+
static void __init loongson3_smp_setup(void)
{
int i = 0, num = 0; /* i: physical id, num: logical id */
+ if (loongson_sysconf.fw_interface == LOONGSON_DTB)
+ parse_dt_cpus_init();
+
init_cpu_possible(cpu_none_mask);
/* For unified kernel, NR_CPUS is the maximum possible value,
@@ -781,6 +831,68 @@ static void loongson3_type3_play_dead(int *state_addr)
: "a1");
}
+static void loongson3_type4_play_dead(int *state_addr)
+{
+ register int val;
+ register long cpuid, core, node, count;
+ register void *addr, *base, *initfunc;
+
+ __asm__ __volatile__(
+ " .set push \n"
+ " .set noreorder \n"
+ " li %[addr], 0x80000000 \n" /* KSEG0 */
+ "1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */
+ " cache 0, 1(%[addr]) \n"
+ " cache 0, 2(%[addr]) \n"
+ " cache 0, 3(%[addr]) \n"
+ " cache 1, 0(%[addr]) \n" /* flush L1 DCache */
+ " cache 1, 1(%[addr]) \n"
+ " cache 1, 2(%[addr]) \n"
+ " cache 1, 3(%[addr]) \n"
+ " addiu %[sets], %[sets], -1 \n"
+ " bnez %[sets], 1b \n"
+ " addiu %[addr], %[addr], 0x40 \n"
+ " li %[val], 0x7 \n" /* *state_addr = CPU_DEAD; */
+ " sw %[val], (%[state_addr]) \n"
+ " sync \n"
+ " cache 21, (%[state_addr]) \n" /* flush entry of *state_addr */
+ " .set pop \n"
+ : [addr] "=&r" (addr), [val] "=&r" (val)
+ : [state_addr] "r" (state_addr),
+ [sets] "r" (cpu_data[smp_processor_id()].dcache.sets));
+
+ __asm__ __volatile__(
+ " .set push \n"
+ " .set noreorder \n"
+ " .set mips64 \n"
+ " mfc0 %[cpuid], $15, 1 \n"
+ " andi %[cpuid], 0x3ff \n"
+ " dli %[base], 0x900000001fe11000 \n"
+ " andi %[core], %[cpuid], 0x3 \n"
+ " sll %[core], 8 \n" /* get core id */
+ " or %[base], %[base], %[core] \n"
+ " andi %[node], %[cpuid], 0xc \n"
+ " dsll %[node], 42 \n" /* get node id */
+ " or %[base], %[base], %[node] \n"
+ "1: li %[count], 0x100 \n" /* wait for init loop */
+ "2: bnez %[count], 2b \n" /* limit mailbox access */
+ " addiu %[count], -1 \n"
+ " ld %[initfunc], 0x20(%[base]) \n" /* get PC via mailbox */
+ " beqz %[initfunc], 1b \n"
+ " nop \n"
+ " ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */
+ " ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */
+ " ld $a1, 0x38(%[base]) \n"
+ " jr %[initfunc] \n" /* jump to initial PC */
+ " nop \n"
+ " .set pop \n"
+ : [core] "=&r" (core), [node] "=&r" (node),
+ [base] "=&r" (base), [cpuid] "=&r" (cpuid),
+ [count] "=&r" (count), [initfunc] "=&r" (initfunc)
+ : /* No Input */
+ : "a1");
+}
+
void play_dead(void)
{
int prid_imp, prid_rev, *state_addr;
@@ -816,6 +928,13 @@ void play_dead(void)
play_dead_at_ckseg1 =
(void *)CKSEG1ADDR((unsigned long)loongson3_type3_play_dead);
break;
+ case PRID_REV_LOONGSON2K_R1_0:
+ case PRID_REV_LOONGSON2K_R1_1:
+ case PRID_REV_LOONGSON2K_R1_2:
+ case PRID_REV_LOONGSON2K_R1_3:
+ play_dead_at_ckseg1 =
+ (void *)CKSEG1ADDR((unsigned long)loongson3_type4_play_dead);
+ break;
}
out:
@@ -854,10 +973,13 @@ static int loongson3_enable_clock(unsigned int cpu)
static int register_loongson3_notifier(void)
{
- return cpuhp_setup_state_nocalls(CPUHP_MIPS_SOC_PREPARE,
- "mips/loongson:prepare",
- loongson3_enable_clock,
- loongson3_disable_clock);
+ if (loongson_sysconf.fw_interface != LOONGSON_DTB)
+ return cpuhp_setup_state_nocalls(CPUHP_MIPS_SOC_PREPARE,
+ "mips/loongson:prepare",
+ loongson3_enable_clock,
+ loongson3_disable_clock);
+ else
+ return 0;
}
early_initcall(register_loongson3_notifier);
--
2.20.1
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