diff options
Diffstat (limited to 'arch/mips/loongson')
| -rw-r--r-- | arch/mips/loongson/common/init.c | 2 | ||||
| -rw-r--r-- | arch/mips/loongson/common/setup.c | 8 | ||||
| -rw-r--r-- | arch/mips/loongson/loongson-3/Makefile | 2 | ||||
| -rw-r--r-- | arch/mips/loongson/loongson-3/irq.c | 20 | ||||
| -rw-r--r-- | arch/mips/loongson/loongson-3/smp.c | 267 | ||||
| -rw-r--r-- | arch/mips/loongson/loongson-3/smp.h | 29 |
6 files changed, 323 insertions, 5 deletions
diff --git a/arch/mips/loongson/common/init.c b/arch/mips/loongson/common/init.c index 81ba3b4a8f30..f37fe5413b73 100644 --- a/arch/mips/loongson/common/init.c +++ b/arch/mips/loongson/common/init.c @@ -9,6 +9,7 @@ */ #include <linux/bootmem.h> +#include <asm/smp-ops.h> #include <loongson.h> @@ -33,6 +34,7 @@ void __init prom_init(void) /*init the uart base address */ prom_init_uart_base(); + register_smp_ops(&loongson3_smp_ops); } void __init prom_free_prom_memory(void) diff --git a/arch/mips/loongson/common/setup.c b/arch/mips/loongson/common/setup.c index 8223f8acfd59..bb4ac922e47a 100644 --- a/arch/mips/loongson/common/setup.c +++ b/arch/mips/loongson/common/setup.c @@ -18,9 +18,6 @@ #include <linux/screen_info.h> #endif -void (*__wbflush)(void); -EXPORT_SYMBOL(__wbflush); - static void wbflush_loongson(void) { asm(".set\tpush\n\t" @@ -32,10 +29,11 @@ static void wbflush_loongson(void) ".set mips0\n\t"); } +void (*__wbflush)(void) = wbflush_loongson; +EXPORT_SYMBOL(__wbflush); + void __init plat_mem_setup(void) { - __wbflush = wbflush_loongson; - #ifdef CONFIG_VT #if defined(CONFIG_VGA_CONSOLE) conswitchp = &vga_con; diff --git a/arch/mips/loongson/loongson-3/Makefile b/arch/mips/loongson/loongson-3/Makefile index b9968cd1602e..70152b252ddc 100644 --- a/arch/mips/loongson/loongson-3/Makefile +++ b/arch/mips/loongson/loongson-3/Makefile @@ -2,3 +2,5 @@ # Makefile for Loongson-3 family machines # obj-y += irq.o + +obj-$(CONFIG_SMP) += smp.o diff --git a/arch/mips/loongson/loongson-3/irq.c b/arch/mips/loongson/loongson-3/irq.c index b2dc62b97a0f..088fd5e4fd64 100644 --- a/arch/mips/loongson/loongson-3/irq.c +++ b/arch/mips/loongson/loongson-3/irq.c @@ -26,6 +26,10 @@ void mach_irq_dispatch(unsigned int pending) { if (pending & CAUSEF_IP7) do_IRQ(LOONGSON_TIMER_IRQ); +#if defined(CONFIG_SMP) + else if (pending & CAUSEF_IP6) + loongson3_ipi_interrupt(NULL); +#endif else if (pending & CAUSEF_IP3) ht_irqdispatch(); else if (pending & CAUSEF_IP2) @@ -45,10 +49,26 @@ static inline void mask_loongson_irq(struct irq_data *d) { clear_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); irq_disable_hazard(); + + /* Workaround: UART IRQ may deliver to any core */ + if (d->irq == LOONGSON_UART_IRQ) { + int cpu = smp_processor_id(); + + LOONGSON_INT_ROUTER_INTENCLR = 1 << 10; + LOONGSON_INT_ROUTER_LPC = 0x10 + (1<<cpu); + } } static inline void unmask_loongson_irq(struct irq_data *d) { + /* Workaround: UART IRQ may deliver to any core */ + if (d->irq == LOONGSON_UART_IRQ) { + int cpu = smp_processor_id(); + + LOONGSON_INT_ROUTER_INTENSET = 1 << 10; + LOONGSON_INT_ROUTER_LPC = 0x10 + (1<<cpu); + } + set_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); irq_enable_hazard(); } diff --git a/arch/mips/loongson/loongson-3/smp.c b/arch/mips/loongson/loongson-3/smp.c new file mode 100644 index 000000000000..93483c25b4b9 --- /dev/null +++ b/arch/mips/loongson/loongson-3/smp.c @@ -0,0 +1,267 @@ +/* + * Copyright (C) 2010, 2011, 2012, Lemote, Inc. + * Author: Chen Huacai, chenhc@lemote.com + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/init.h> +#include <linux/cpu.h> +#include <linux/sched.h> +#include <linux/smp.h> +#include <linux/cpufreq.h> +#include <asm/processor.h> +#include <asm/time.h> +#include <asm/clock.h> +#include <asm/tlbflush.h> +#include <loongson.h> + +#include "smp.h" + +/* read a 32bit value from ipi register */ +#define loongson3_ipi_read32(addr) readl(addr) +/* read a 64bit value from ipi register */ +#define loongson3_ipi_read64(addr) readq(addr) +/* write a 32bit value to ipi register */ +#define loongson3_ipi_write32(action, addr) \ + do { \ + writel(action, addr); \ + __wbflush(); \ + } while (0) +/* write a 64bit value to ipi register */ +#define loongson3_ipi_write64(action, addr) \ + do { \ + writeq(action, addr); \ + __wbflush(); \ + } while (0) + +static void *ipi_set0_regs[] = { + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + SET0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + SET0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + SET0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + SET0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + SET0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + SET0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + SET0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + SET0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + SET0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + SET0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + SET0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + SET0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + SET0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + SET0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + SET0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + SET0), +}; + +static void *ipi_clear0_regs[] = { + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + CLEAR0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + CLEAR0), +}; + +static void *ipi_status0_regs[] = { + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + STATUS0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + STATUS0), +}; + +static void *ipi_en0_regs[] = { + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + EN0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + EN0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + EN0), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + EN0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + EN0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + EN0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + EN0), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + EN0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + EN0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + EN0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + EN0), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + EN0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + EN0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + EN0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + EN0), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + EN0), +}; + +static void *ipi_mailbox_buf[] = { + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + BUF), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + BUF), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + BUF), + (void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + BUF), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + BUF), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + BUF), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + BUF), + (void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + BUF), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + BUF), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + BUF), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + BUF), + (void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + BUF), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + BUF), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + BUF), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + BUF), + (void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + BUF), +}; + +/* + * Simple enough, just poke the appropriate ipi register + */ +static void loongson3_send_ipi_single(int cpu, unsigned int action) +{ + loongson3_ipi_write32((u32)action, ipi_set0_regs[cpu]); +} + +static void +loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action) +{ + unsigned int i; + + for_each_cpu(i, mask) + loongson3_ipi_write32((u32)action, ipi_set0_regs[i]); +} + +void loongson3_ipi_interrupt(struct pt_regs *regs) +{ + int cpu = smp_processor_id(); + unsigned int action; + + /* Load the ipi register to figure out what we're supposed to do */ + action = loongson3_ipi_read32(ipi_status0_regs[cpu]); + + /* Clear the ipi register to clear the interrupt */ + loongson3_ipi_write32((u32)action, ipi_clear0_regs[cpu]); + + if (action & SMP_RESCHEDULE_YOURSELF) + scheduler_ipi(); + + if (action & SMP_CALL_FUNCTION) + smp_call_function_interrupt(); +} + +/* + * SMP init and finish on secondary CPUs + */ +static void loongson3_init_secondary(void) +{ + int i; + unsigned int imask = STATUSF_IP7 | STATUSF_IP6 | + STATUSF_IP3 | STATUSF_IP2; + + /* Set interrupt mask, but don't enable */ + change_c0_status(ST0_IM, imask); + + for (i = 0; i < loongson_sysconf.nr_cpus; i++) + loongson3_ipi_write32(0xffffffff, ipi_en0_regs[i]); +} + +static void loongson3_smp_finish(void) +{ + write_c0_compare(read_c0_count() + mips_hpt_frequency/HZ); + local_irq_enable(); + loongson3_ipi_write64(0, + (void *)(ipi_mailbox_buf[smp_processor_id()]+0x0)); + pr_info("CPU#%d finished, CP0_ST=%x\n", + smp_processor_id(), read_c0_status()); +} + +static void __init loongson3_smp_setup(void) +{ + int i, num; + + init_cpu_possible(cpu_none_mask); + set_cpu_possible(0, true); + + __cpu_number_map[0] = 0; + __cpu_logical_map[0] = 0; + + /* For unified kernel, NR_CPUS is the maximum possible value, + * loongson_sysconf.nr_cpus is the really present value */ + for (i = 1, num = 0; i < loongson_sysconf.nr_cpus; i++) { + set_cpu_possible(i, true); + __cpu_number_map[i] = ++num; + __cpu_logical_map[num] = i; + } + pr_info("Detected %i available secondary CPU(s)\n", num); +} + +static void __init loongson3_prepare_cpus(unsigned int max_cpus) +{ +} + +/* + * Setup the PC, SP, and GP of a secondary processor and start it runing! + */ +static void loongson3_boot_secondary(int cpu, struct task_struct *idle) +{ + unsigned long startargs[4]; + + pr_info("Booting CPU#%d...\n", cpu); + + /* startargs[] are initial PC, SP and GP for secondary CPU */ + startargs[0] = (unsigned long)&smp_bootstrap; + startargs[1] = (unsigned long)__KSTK_TOS(idle); + startargs[2] = (unsigned long)task_thread_info(idle); + startargs[3] = 0; + + pr_debug("CPU#%d, func_pc=%lx, sp=%lx, gp=%lx\n", + cpu, startargs[0], startargs[1], startargs[2]); + + loongson3_ipi_write64(startargs[3], (void *)(ipi_mailbox_buf[cpu]+0x18)); + loongson3_ipi_write64(startargs[2], (void *)(ipi_mailbox_buf[cpu]+0x10)); + loongson3_ipi_write64(startargs[1], (void *)(ipi_mailbox_buf[cpu]+0x8)); + loongson3_ipi_write64(startargs[0], (void *)(ipi_mailbox_buf[cpu]+0x0)); +} + +/* + * Final cleanup after all secondaries booted + */ +static void __init loongson3_cpus_done(void) +{ +} + +struct plat_smp_ops loongson3_smp_ops = { + .send_ipi_single = loongson3_send_ipi_single, + .send_ipi_mask = loongson3_send_ipi_mask, + .init_secondary = loongson3_init_secondary, + .smp_finish = loongson3_smp_finish, + .cpus_done = loongson3_cpus_done, + .boot_secondary = loongson3_boot_secondary, + .smp_setup = loongson3_smp_setup, + .prepare_cpus = loongson3_prepare_cpus, +}; diff --git a/arch/mips/loongson/loongson-3/smp.h b/arch/mips/loongson/loongson-3/smp.h new file mode 100644 index 000000000000..3453e8c4f2f0 --- /dev/null +++ b/arch/mips/loongson/loongson-3/smp.h @@ -0,0 +1,29 @@ +#ifndef __LOONGSON_SMP_H_ +#define __LOONGSON_SMP_H_ + +/* for Loongson-3A smp support */ + +/* 4 groups(nodes) in maximum in numa case */ +#define SMP_CORE_GROUP0_BASE 0x900000003ff01000 +#define SMP_CORE_GROUP1_BASE 0x900010003ff01000 +#define SMP_CORE_GROUP2_BASE 0x900020003ff01000 +#define SMP_CORE_GROUP3_BASE 0x900030003ff01000 + +/* 4 cores in each group(node) */ +#define SMP_CORE0_OFFSET 0x000 +#define SMP_CORE1_OFFSET 0x100 +#define SMP_CORE2_OFFSET 0x200 +#define SMP_CORE3_OFFSET 0x300 + +/* ipi registers offsets */ +#define STATUS0 0x00 +#define EN0 0x04 +#define SET0 0x08 +#define CLEAR0 0x0c +#define STATUS1 0x10 +#define MASK1 0x14 +#define SET1 0x18 +#define CLEAR1 0x1c +#define BUF 0x20 + +#endif |