- Use improved timer sync for Loongson64

- Fix address of GCR_ACCESS register
 - Add missing MODULE_DESCRIPTION
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Merge tag 'mips_6.11_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

Pull MIPS updates from Thomas Bogendoerfer:

 - Use improved timer sync for Loongson64

 - Fix address of GCR_ACCESS register

 - Add missing MODULE_DESCRIPTION

* tag 'mips_6.11_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  mips: sibyte: add missing MODULE_DESCRIPTION() macro
  MIPS: SMP-CPS: Fix address for GCR_ACCESS register for CM3 and later
  MIPS: Loongson64: Switch to SYNC_R4K

arch/mips/Kconfig

@@ -478,6 +478,7 @@ config MACH_LOONGSON64
 	select BOARD_SCACHE
 	select CSRC_R4K
 	select CEVT_R4K
+	select SYNC_R4K
 	select FORCE_PCI
 	select ISA
 	select I8259

arch/mips/include/asm/mips-cm.h

@@ -240,6 +240,10 @@ GCR_ACCESSOR_RO(32, 0x0d0, gic_status)
 GCR_ACCESSOR_RO(32, 0x0f0, cpc_status)
 #define CM_GCR_CPC_STATUS_EX			BIT(0)
 
+/* GCR_ACCESS - Controls core/IOCU access to GCRs */
+GCR_ACCESSOR_RW(32, 0x120, access_cm3)
+#define CM_GCR_ACCESS_ACCESSEN			GENMASK(7, 0)
+
 /* GCR_L2_CONFIG - Indicates L2 cache configuration when Config5.L2C=1 */
 GCR_ACCESSOR_RW(32, 0x130, l2_config)
 #define CM_GCR_L2_CONFIG_BYPASS			BIT(20)

arch/mips/include/asm/smp.h

@@ -50,7 +50,6 @@ extern int __cpu_logical_map[NR_CPUS];
 #define SMP_CALL_FUNCTION	0x2
 /* Octeon - Tell another core to flush its icache */
 #define SMP_ICACHE_FLUSH	0x4
-#define SMP_ASK_C0COUNT		0x8
 
 /* Mask of CPUs which are currently definitely operating coherently */
 extern cpumask_t cpu_coherent_mask;

arch/mips/kernel/smp-cps.c

@@ -317,7 +317,10 @@ static void boot_core(unsigned int core, unsigned int vpe_id)
 	write_gcr_co_reset_ext_base(CM_GCR_Cx_RESET_EXT_BASE_UEB);
 
 	/* Ensure the core can access the GCRs */
+	if (mips_cm_revision() < CM_REV_CM3)
 		set_gcr_access(1 << core);
+	else
+		set_gcr_access_cm3(1 << core);
 
 	if (mips_cpc_present()) {
 		/* Reset the core */

arch/mips/loongson64/smp.c

@@ -33,7 +33,6 @@ static void __iomem *ipi_clear0_regs[16];
 static void __iomem *ipi_status0_regs[16];
 static void __iomem *ipi_en0_regs[16];
 static void __iomem *ipi_mailbox_buf[16];
-static uint32_t core0_c0count[NR_CPUS];
 
 static u32 (*ipi_read_clear)(int cpu);
 static void (*ipi_write_action)(int cpu, u32 action);
@@ -382,11 +381,10 @@ loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 		ipi_write_action(cpu_logical_map(i), (u32)action);
 }
 
-
 static irqreturn_t loongson3_ipi_interrupt(int irq, void *dev_id)
 {
-	int i, cpu = smp_processor_id();
-	unsigned int action, c0count;
+	int cpu = smp_processor_id();
+	unsigned int action;
 
 	action = ipi_read_clear(cpu);
 
@@ -399,26 +397,14 @@ static irqreturn_t loongson3_ipi_interrupt(int irq, void *dev_id)
 		irq_exit();
 	}
 
-	if (action & SMP_ASK_C0COUNT) {
-		BUG_ON(cpu != 0);
-		c0count = read_c0_count();
-		c0count = c0count ? c0count : 1;
-		for (i = 1; i < nr_cpu_ids; i++)
-			core0_c0count[i] = c0count;
-		nudge_writes(); /* Let others see the result ASAP */
-	}
-
 	return IRQ_HANDLED;
 }
 
-#define MAX_LOOPS 800
 /*
  * SMP init and finish on secondary CPUs
  */
 static void loongson3_init_secondary(void)
 {
-	int i;
-	uint32_t initcount;
 	unsigned int cpu = smp_processor_id();
 	unsigned int imask = STATUSF_IP7 | STATUSF_IP6 |
 			     STATUSF_IP3 | STATUSF_IP2;
@@ -432,23 +418,6 @@ static void loongson3_init_secondary(void)
 		     cpu_logical_map(cpu) % loongson_sysconf.cores_per_package);
 	cpu_data[cpu].package =
 		cpu_logical_map(cpu) / loongson_sysconf.cores_per_package;
-
-	i = 0;
-	core0_c0count[cpu] = 0;
-	loongson3_send_ipi_single(0, SMP_ASK_C0COUNT);
-	while (!core0_c0count[cpu]) {
-		i++;
-		cpu_relax();
-	}
-
-	if (i > MAX_LOOPS)
-		i = MAX_LOOPS;
-	if (cpu_data[cpu].package)
-		initcount = core0_c0count[cpu] + i;
-	else /* Local access is faster for loops */
-		initcount = core0_c0count[cpu] + i/2;
-
-	write_c0_count(initcount);
 }
 
 static void loongson3_smp_finish(void)

arch/mips/sibyte/common/sb_tbprof.c

@@ -589,4 +589,5 @@ module_exit(sbprof_tb_cleanup);
 
 MODULE_ALIAS_CHARDEV_MAJOR(SBPROF_TB_MAJOR);
 MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
+MODULE_DESCRIPTION("Support for ZBbus profiling");
 MODULE_LICENSE("GPL");