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/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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unsigned int ret = XICS_IRQ_SPURIOUS;
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rc = plpar_hcall(H_XIRR, retbuf, cppr);
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if (rc == H_SUCCESS) {
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ret = (unsigned int)retbuf[0];
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} else {
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pr_err("%s: bad return code xirr cppr=0x%x returned %ld\n",
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__func__, cppr, rc);
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WARN_ON_ONCE(1);
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}
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return ret;
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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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pr_err("%s: bad return code cppr cppr=0x%x returned %ld\n",
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__func__, value, rc);
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WARN_ON_ONCE(1);
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}
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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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pr_err("%s: bad return code eoi xirr=0x%x returned %ld\n",
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__func__, value, rc);
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WARN_ON_ONCE(1);
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icp_hv_set_cppr(value >> 24);
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}
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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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int hw_cpu = get_hard_smp_processor_id(n_cpu);
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long rc;
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/* Make sure all previous accesses are ordered before IPI sending */
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mb();
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rc = plpar_hcall_norets(H_IPI, hw_cpu, value);
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if (rc != H_SUCCESS) {
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pr_err("%s: bad return code qirr cpu=%d hw_cpu=%d mfrr=0x%x "
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"returned %ld\n", __func__, n_cpu, hw_cpu, value, rc);
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WARN_ON_ONCE(1);
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}
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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)irqd_to_hwirq(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 0;
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irq = irq_find_mapping(xics_host, vec);
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if (likely(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 0;
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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 void icp_hv_cause_ipi(int cpu)
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{
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icp_hv_set_qirr(cpu, IPI_PRIORITY);
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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 smp_ipi_demux();
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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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.cause_ipi = icp_hv_cause_ipi,
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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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