b830cde5a4
Platforms export their SMP callbacks by populating arc_smp_ops. The population itself needs to be done pretty early, from init_early callback. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de>
171 lines
4.6 KiB
C
171 lines
4.6 KiB
C
/*
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* ARC700 Simulation-only Extensions for SMP
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*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Vineet Gupta - 2012 : split off arch common and plat specific SMP
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* Rajeshwar Ranga - 2007 : Interrupt Distribution Unit API's
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*/
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#include <linux/smp.h>
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#include <linux/irq.h>
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#include <plat/irq.h>
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#include <plat/smp.h>
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static char smp_cpuinfo_buf[128];
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/*
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*-------------------------------------------------------------------
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* Platform specific callbacks expected by arch SMP code
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*-------------------------------------------------------------------
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*/
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/*
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* Master kick starting another CPU
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*/
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static void iss_model_smp_wakeup_cpu(int cpu, unsigned long pc)
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{
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/* setup the start PC */
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write_aux_reg(ARC_AUX_XTL_REG_PARAM, pc);
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/* Trigger WRITE_PC cmd for this cpu */
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write_aux_reg(ARC_AUX_XTL_REG_CMD,
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(ARC_XTL_CMD_WRITE_PC | (cpu << 8)));
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/* Take the cpu out of Halt */
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write_aux_reg(ARC_AUX_XTL_REG_CMD,
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(ARC_XTL_CMD_CLEAR_HALT | (cpu << 8)));
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}
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/*
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* Any SMP specific init any CPU does when it comes up.
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* Here we setup the CPU to enable Inter-Processor-Interrupts
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* Called for each CPU
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* -Master : init_IRQ()
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* -Other(s) : start_kernel_secondary()
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*/
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void iss_model_init_smp(unsigned int cpu)
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{
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/* Check if CPU is configured for more than 16 interrupts */
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if (NR_IRQS <= 16 || get_hw_config_num_irq() <= 16)
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panic("[arcfpga] IRQ system can't support IDU IPI\n");
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idu_disable();
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/****************************************************************
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* IDU provides a set of Common IRQs, each of which can be dynamically
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* attached to (1|many|all) CPUs.
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* The Common IRQs [0-15] are mapped as CPU pvt [16-31]
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*
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* Here we use a simple 1:1 mapping:
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* A CPU 'x' is wired to Common IRQ 'x'.
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* So an IDU ASSERT on IRQ 'x' will trigger Interupt on CPU 'x', which
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* makes up for our simple IPI plumbing.
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*
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* TBD: Have a dedicated multicast IRQ for sending IPIs to all CPUs
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* w/o having to do one-at-a-time
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******************************************************************/
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/*
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* Claim an IRQ which would trigger IPI on this CPU.
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* In IDU parlance it involves setting up a cpu bitmask for the IRQ
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* The bitmap here contains only 1 CPU (self).
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*/
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idu_irq_set_tgtcpu(cpu, 0x1 << cpu);
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/* Set the IRQ destination to use the bitmask above */
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idu_irq_set_mode(cpu, 7, /* XXX: IDU_IRQ_MOD_TCPU_ALLRECP: ISS bug */
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IDU_IRQ_MODE_PULSE_TRIG);
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idu_enable();
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/* Attach the arch-common IPI ISR to our IDU IRQ */
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smp_ipi_irq_setup(cpu, IDU_INTERRUPT_0 + cpu);
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}
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static void iss_model_ipi_send(void *arg)
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{
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struct cpumask *callmap = arg;
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unsigned int cpu;
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for_each_cpu(cpu, callmap)
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idu_irq_assert(cpu);
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}
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static void iss_model_ipi_clear(int cpu, int irq)
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{
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idu_irq_clear(IDU_INTERRUPT_0 + cpu);
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}
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void iss_model_init_early_smp(void)
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{
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#define IS_AVAIL1(var, str) ((var) ? str : "")
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struct bcr_mp mp;
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READ_BCR(ARC_REG_MP_BCR, mp);
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sprintf(smp_cpuinfo_buf, "Extn [ISS-SMP]: v%d, arch(%d) %s %s %s\n",
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mp.ver, mp.mp_arch, IS_AVAIL1(mp.scu, "SCU"),
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IS_AVAIL1(mp.idu, "IDU"), IS_AVAIL1(mp.sdu, "SDU"));
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plat_smp_ops.info = smp_cpuinfo_buf;
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plat_smp_ops.cpu_kick = iss_model_smp_wakeup_cpu;
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plat_smp_ops.ipi_send = iss_model_ipi_send;
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plat_smp_ops.ipi_clear = iss_model_ipi_clear;
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}
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/*
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*-------------------------------------------------------------------
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* Low level Platform IPI Providers
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*-------------------------------------------------------------------
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*/
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/* Set the Mode for the Common IRQ */
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void idu_irq_set_mode(uint8_t irq, uint8_t dest_mode, uint8_t trig_mode)
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{
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uint32_t par = IDU_IRQ_MODE_PARAM(dest_mode, trig_mode);
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IDU_SET_PARAM(par);
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IDU_SET_COMMAND(irq, IDU_IRQ_WMODE);
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}
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/* Set the target cpu Bitmask for Common IRQ */
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void idu_irq_set_tgtcpu(uint8_t irq, uint32_t mask)
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{
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IDU_SET_PARAM(mask);
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IDU_SET_COMMAND(irq, IDU_IRQ_WBITMASK);
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}
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/* Get the Interrupt Acknowledged status for IRQ (as CPU Bitmask) */
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bool idu_irq_get_ack(uint8_t irq)
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{
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uint32_t val;
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IDU_SET_COMMAND(irq, IDU_IRQ_ACK);
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val = IDU_GET_PARAM();
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return val & (1 << irq);
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}
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/*
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* Get the Interrupt Pending status for IRQ (as CPU Bitmask)
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* -Pending means CPU has not yet noticed the IRQ (e.g. disabled)
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* -After Interrupt has been taken, the IPI expcitily needs to be
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* cleared, to be acknowledged.
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*/
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bool idu_irq_get_pend(uint8_t irq)
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{
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uint32_t val;
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IDU_SET_COMMAND(irq, IDU_IRQ_PEND);
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val = IDU_GET_PARAM();
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return val & (1 << irq);
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}
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