185 lines
3.9 KiB
C
185 lines
3.9 KiB
C
/*
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* Copyright 2011 IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/irq.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/cpu.h>
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#include <linux/of.h>
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#include <asm/smp.h>
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#include <asm/irq.h>
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#include <asm/errno.h>
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#include <asm/xics.h>
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#include <asm/io.h>
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#include <asm/hvcall.h>
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static inline unsigned int icp_hv_get_xirr(unsigned char cppr)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
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long rc;
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rc = plpar_hcall(H_XIRR, retbuf, cppr);
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if (rc != H_SUCCESS)
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panic(" bad return code xirr - rc = %lx\n", rc);
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return (unsigned int)retbuf[0];
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}
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static inline void icp_hv_set_xirr(unsigned int value)
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{
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long rc = plpar_hcall_norets(H_EOI, value);
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if (rc != H_SUCCESS)
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panic("bad return code EOI - rc = %ld, value=%x\n", rc, value);
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}
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static inline void icp_hv_set_cppr(u8 value)
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{
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long rc = plpar_hcall_norets(H_CPPR, value);
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if (rc != H_SUCCESS)
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panic("bad return code cppr - rc = %lx\n", rc);
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}
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static inline void icp_hv_set_qirr(int n_cpu , u8 value)
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{
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long rc = plpar_hcall_norets(H_IPI, get_hard_smp_processor_id(n_cpu),
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value);
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if (rc != H_SUCCESS)
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panic("bad return code qirr - rc = %lx\n", rc);
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}
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static void icp_hv_eoi(struct irq_data *d)
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{
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unsigned int hw_irq = (unsigned int)irq_data_to_hw(d);
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iosync();
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icp_hv_set_xirr((xics_pop_cppr() << 24) | hw_irq);
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}
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static void icp_hv_teardown_cpu(void)
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{
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int cpu = smp_processor_id();
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/* Clear any pending IPI */
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icp_hv_set_qirr(cpu, 0xff);
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}
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static void icp_hv_flush_ipi(void)
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{
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/* We take the ipi irq but and never return so we
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* need to EOI the IPI, but want to leave our priority 0
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*
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* should we check all the other interrupts too?
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* should we be flagging idle loop instead?
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* or creating some task to be scheduled?
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*/
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icp_hv_set_xirr((0x00 << 24) | XICS_IPI);
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}
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static unsigned int icp_hv_get_irq(void)
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{
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unsigned int xirr = icp_hv_get_xirr(xics_cppr_top());
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unsigned int vec = xirr & 0x00ffffff;
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unsigned int irq;
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if (vec == XICS_IRQ_SPURIOUS)
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return NO_IRQ;
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irq = irq_radix_revmap_lookup(xics_host, vec);
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if (likely(irq != NO_IRQ)) {
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xics_push_cppr(vec);
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return irq;
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}
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/* We don't have a linux mapping, so have rtas mask it. */
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xics_mask_unknown_vec(vec);
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/* We might learn about it later, so EOI it */
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icp_hv_set_xirr(xirr);
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return NO_IRQ;
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}
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static void icp_hv_set_cpu_priority(unsigned char cppr)
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{
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xics_set_base_cppr(cppr);
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icp_hv_set_cppr(cppr);
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iosync();
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}
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#ifdef CONFIG_SMP
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static inline void icp_hv_do_message(int cpu, int msg)
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{
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unsigned long *tgt = &per_cpu(xics_ipi_message, cpu);
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set_bit(msg, tgt);
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mb();
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icp_hv_set_qirr(cpu, IPI_PRIORITY);
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}
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static void icp_hv_message_pass(int target, int msg)
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{
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unsigned int i;
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if (target < NR_CPUS) {
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icp_hv_do_message(target, msg);
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} else {
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for_each_online_cpu(i) {
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if (target == MSG_ALL_BUT_SELF
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&& i == smp_processor_id())
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continue;
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icp_hv_do_message(i, msg);
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}
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}
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}
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static irqreturn_t icp_hv_ipi_action(int irq, void *dev_id)
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{
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int cpu = smp_processor_id();
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icp_hv_set_qirr(cpu, 0xff);
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return xics_ipi_dispatch(cpu);
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}
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#endif /* CONFIG_SMP */
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static const struct icp_ops icp_hv_ops = {
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.get_irq = icp_hv_get_irq,
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.eoi = icp_hv_eoi,
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.set_priority = icp_hv_set_cpu_priority,
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.teardown_cpu = icp_hv_teardown_cpu,
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.flush_ipi = icp_hv_flush_ipi,
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#ifdef CONFIG_SMP
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.ipi_action = icp_hv_ipi_action,
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.message_pass = icp_hv_message_pass,
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#endif
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};
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int icp_hv_init(void)
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{
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struct device_node *np;
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np = of_find_compatible_node(NULL, NULL, "ibm,ppc-xicp");
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if (!np)
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np = of_find_node_by_type(NULL,
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"PowerPC-External-Interrupt-Presentation");
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if (!np)
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return -ENODEV;
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icp_ops = &icp_hv_ops;
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return 0;
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}
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