303 lines
6.6 KiB
C
303 lines
6.6 KiB
C
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/*
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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 <linux/spinlock.h>
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#include <linux/module.h>
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#include <asm/prom.h>
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#include <asm/io.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/kvm_ppc.h>
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struct icp_ipl {
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union {
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u32 word;
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u8 bytes[4];
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} xirr_poll;
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union {
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u32 word;
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u8 bytes[4];
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} xirr;
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u32 dummy;
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union {
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u32 word;
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u8 bytes[4];
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} qirr;
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u32 link_a;
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u32 link_b;
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u32 link_c;
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};
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static struct icp_ipl __iomem *icp_native_regs[NR_CPUS];
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static inline unsigned int icp_native_get_xirr(void)
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{
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int cpu = smp_processor_id();
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return in_be32(&icp_native_regs[cpu]->xirr.word);
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}
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static inline void icp_native_set_xirr(unsigned int value)
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{
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int cpu = smp_processor_id();
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out_be32(&icp_native_regs[cpu]->xirr.word, value);
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}
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static inline void icp_native_set_cppr(u8 value)
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{
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int cpu = smp_processor_id();
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out_8(&icp_native_regs[cpu]->xirr.bytes[0], value);
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}
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static inline void icp_native_set_qirr(int n_cpu, u8 value)
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{
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out_8(&icp_native_regs[n_cpu]->qirr.bytes[0], value);
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}
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static void icp_native_set_cpu_priority(unsigned char cppr)
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{
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xics_set_base_cppr(cppr);
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icp_native_set_cppr(cppr);
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iosync();
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}
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static void icp_native_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_native_set_xirr((xics_pop_cppr() << 24) | hw_irq);
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}
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static void icp_native_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_native_set_qirr(cpu, 0xff);
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}
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static void icp_native_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_native_set_xirr((0x00 << 24) | XICS_IPI);
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}
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static unsigned int icp_native_get_irq(void)
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{
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unsigned int xirr = icp_native_get_xirr();
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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_native_set_xirr(xirr);
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return NO_IRQ;
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}
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#ifdef CONFIG_SMP
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static void icp_native_cause_ipi(int cpu, unsigned long data)
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{
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icp_native_set_qirr(cpu, IPI_PRIORITY);
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}
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void xics_wake_cpu(int cpu)
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{
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icp_native_set_qirr(cpu, IPI_PRIORITY);
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}
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EXPORT_SYMBOL_GPL(xics_wake_cpu);
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static irqreturn_t icp_native_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_native_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 int __init icp_native_map_one_cpu(int hw_id, unsigned long addr,
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unsigned long size)
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{
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char *rname;
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int i, cpu = -1;
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/* This may look gross but it's good enough for now, we don't quite
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* have a hard -> linux processor id matching.
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*/
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for_each_possible_cpu(i) {
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if (!cpu_present(i))
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continue;
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if (hw_id == get_hard_smp_processor_id(i)) {
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cpu = i;
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break;
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}
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}
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/* Fail, skip that CPU. Don't print, it's normal, some XICS come up
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* with way more entries in there than you have CPUs
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*/
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if (cpu == -1)
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return 0;
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rname = kasprintf(GFP_KERNEL, "CPU %d [0x%x] Interrupt Presentation",
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cpu, hw_id);
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if (!request_mem_region(addr, size, rname)) {
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pr_warning("icp_native: Could not reserve ICP MMIO"
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" for CPU %d, interrupt server #0x%x\n",
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cpu, hw_id);
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return -EBUSY;
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}
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icp_native_regs[cpu] = ioremap(addr, size);
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kvmppc_set_xics_phys(cpu, addr);
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if (!icp_native_regs[cpu]) {
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pr_warning("icp_native: Failed ioremap for CPU %d, "
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"interrupt server #0x%x, addr %#lx\n",
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cpu, hw_id, addr);
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release_mem_region(addr, size);
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return -ENOMEM;
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}
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return 0;
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}
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static int __init icp_native_init_one_node(struct device_node *np,
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unsigned int *indx)
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{
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unsigned int ilen;
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const u32 *ireg;
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int i;
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int reg_tuple_size;
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int num_servers = 0;
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/* This code does the theorically broken assumption that the interrupt
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* server numbers are the same as the hard CPU numbers.
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* This happens to be the case so far but we are playing with fire...
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* should be fixed one of these days. -BenH.
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*/
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ireg = of_get_property(np, "ibm,interrupt-server-ranges", &ilen);
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/* Do that ever happen ? we'll know soon enough... but even good'old
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* f80 does have that property ..
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*/
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WARN_ON((ireg == NULL) || (ilen != 2*sizeof(u32)));
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if (ireg) {
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*indx = of_read_number(ireg, 1);
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if (ilen >= 2*sizeof(u32))
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num_servers = of_read_number(ireg + 1, 1);
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}
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ireg = of_get_property(np, "reg", &ilen);
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if (!ireg) {
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pr_err("icp_native: Can't find interrupt reg property");
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return -1;
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}
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reg_tuple_size = (of_n_addr_cells(np) + of_n_size_cells(np)) * 4;
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if (((ilen % reg_tuple_size) != 0)
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|| (num_servers && (num_servers != (ilen / reg_tuple_size)))) {
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pr_err("icp_native: ICP reg len (%d) != num servers (%d)",
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ilen / reg_tuple_size, num_servers);
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return -1;
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}
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for (i = 0; i < (ilen / reg_tuple_size); i++) {
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struct resource r;
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int err;
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err = of_address_to_resource(np, i, &r);
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if (err) {
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pr_err("icp_native: Could not translate ICP MMIO"
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" for interrupt server 0x%x (%d)\n", *indx, err);
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return -1;
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}
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if (icp_native_map_one_cpu(*indx, r.start, resource_size(&r)))
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return -1;
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(*indx)++;
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}
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return 0;
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}
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static const struct icp_ops icp_native_ops = {
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.get_irq = icp_native_get_irq,
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.eoi = icp_native_eoi,
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.set_priority = icp_native_set_cpu_priority,
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.teardown_cpu = icp_native_teardown_cpu,
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.flush_ipi = icp_native_flush_ipi,
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#ifdef CONFIG_SMP
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.ipi_action = icp_native_ipi_action,
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.cause_ipi = icp_native_cause_ipi,
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#endif
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};
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int __init icp_native_init(void)
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{
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struct device_node *np;
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u32 indx = 0;
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int found = 0;
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for_each_compatible_node(np, NULL, "ibm,ppc-xicp")
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if (icp_native_init_one_node(np, &indx) == 0)
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found = 1;
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if (!found) {
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for_each_node_by_type(np,
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"PowerPC-External-Interrupt-Presentation") {
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if (icp_native_init_one_node(np, &indx) == 0)
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found = 1;
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}
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}
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if (found == 0)
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return -ENODEV;
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icp_ops = &icp_native_ops;
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return 0;
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}
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