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181 lines
3.7 KiB
181 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2011 IBM Corporation. |
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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/irqdomain.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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of_node_put(np); |
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return 0; |
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} |
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