/* * Copyright 2011 IBM Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct icp_ipl { union { u32 word; u8 bytes[4]; } xirr_poll; union { u32 word; u8 bytes[4]; } xirr; u32 dummy; union { u32 word; u8 bytes[4]; } qirr; u32 link_a; u32 link_b; u32 link_c; }; static struct icp_ipl __iomem *icp_native_regs[NR_CPUS]; static inline unsigned int icp_native_get_xirr(void) { int cpu = smp_processor_id(); return in_be32(&icp_native_regs[cpu]->xirr.word); } static inline void icp_native_set_xirr(unsigned int value) { int cpu = smp_processor_id(); out_be32(&icp_native_regs[cpu]->xirr.word, value); } static inline void icp_native_set_cppr(u8 value) { int cpu = smp_processor_id(); out_8(&icp_native_regs[cpu]->xirr.bytes[0], value); } static inline void icp_native_set_qirr(int n_cpu, u8 value) { out_8(&icp_native_regs[n_cpu]->qirr.bytes[0], value); } static void icp_native_set_cpu_priority(unsigned char cppr) { xics_set_base_cppr(cppr); icp_native_set_cppr(cppr); iosync(); } static void icp_native_eoi(struct irq_data *d) { unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); iosync(); icp_native_set_xirr((xics_pop_cppr() << 24) | hw_irq); } static void icp_native_teardown_cpu(void) { int cpu = smp_processor_id(); /* Clear any pending IPI */ icp_native_set_qirr(cpu, 0xff); } static void icp_native_flush_ipi(void) { /* We take the ipi irq but and never return so we * need to EOI the IPI, but want to leave our priority 0 * * should we check all the other interrupts too? * should we be flagging idle loop instead? * or creating some task to be scheduled? */ icp_native_set_xirr((0x00 << 24) | XICS_IPI); } static unsigned int icp_native_get_irq(void) { unsigned int xirr = icp_native_get_xirr(); unsigned int vec = xirr & 0x00ffffff; unsigned int irq; if (vec == XICS_IRQ_SPURIOUS) return NO_IRQ; irq = irq_radix_revmap_lookup(xics_host, vec); if (likely(irq != NO_IRQ)) { xics_push_cppr(vec); return irq; } /* We don't have a linux mapping, so have rtas mask it. */ xics_mask_unknown_vec(vec); /* We might learn about it later, so EOI it */ icp_native_set_xirr(xirr); return NO_IRQ; } #ifdef CONFIG_SMP static inline void icp_native_do_message(int cpu, int msg) { unsigned long *tgt = &per_cpu(xics_ipi_message, cpu); set_bit(msg, tgt); mb(); icp_native_set_qirr(cpu, IPI_PRIORITY); } static void icp_native_message_pass(int target, int msg) { unsigned int i; if (target < NR_CPUS) { icp_native_do_message(target, msg); } else { for_each_online_cpu(i) { if (target == MSG_ALL_BUT_SELF && i == smp_processor_id()) continue; icp_native_do_message(i, msg); } } } static irqreturn_t icp_native_ipi_action(int irq, void *dev_id) { int cpu = smp_processor_id(); icp_native_set_qirr(cpu, 0xff); return xics_ipi_dispatch(cpu); } #endif /* CONFIG_SMP */ static int __init icp_native_map_one_cpu(int hw_id, unsigned long addr, unsigned long size) { char *rname; int i, cpu = -1; /* This may look gross but it's good enough for now, we don't quite * have a hard -> linux processor id matching. */ for_each_possible_cpu(i) { if (!cpu_present(i)) continue; if (hw_id == get_hard_smp_processor_id(i)) { cpu = i; break; } } /* Fail, skip that CPU. Don't print, it's normal, some XICS come up * with way more entries in there than you have CPUs */ if (cpu == -1) return 0; rname = kasprintf(GFP_KERNEL, "CPU %d [0x%x] Interrupt Presentation", cpu, hw_id); if (!request_mem_region(addr, size, rname)) { pr_warning("icp_native: Could not reserve ICP MMIO" " for CPU %d, interrupt server #0x%x\n", cpu, hw_id); return -EBUSY; } icp_native_regs[cpu] = ioremap(addr, size); if (!icp_native_regs[cpu]) { pr_warning("icp_native: Failed ioremap for CPU %d, " "interrupt server #0x%x, addr %#lx\n", cpu, hw_id, addr); release_mem_region(addr, size); return -ENOMEM; } return 0; } static int __init icp_native_init_one_node(struct device_node *np, unsigned int *indx) { unsigned int ilen; const u32 *ireg; int i; int reg_tuple_size; int num_servers = 0; /* This code does the theorically broken assumption that the interrupt * server numbers are the same as the hard CPU numbers. * This happens to be the case so far but we are playing with fire... * should be fixed one of these days. -BenH. */ ireg = of_get_property(np, "ibm,interrupt-server-ranges", &ilen); /* Do that ever happen ? we'll know soon enough... but even good'old * f80 does have that property .. */ WARN_ON((ireg == NULL) || (ilen != 2*sizeof(u32))); if (ireg) { *indx = of_read_number(ireg, 1); if (ilen >= 2*sizeof(u32)) num_servers = of_read_number(ireg + 1, 1); } ireg = of_get_property(np, "reg", &ilen); if (!ireg) { pr_err("icp_native: Can't find interrupt reg property"); return -1; } reg_tuple_size = (of_n_addr_cells(np) + of_n_size_cells(np)) * 4; if (((ilen % reg_tuple_size) != 0) || (num_servers && (num_servers != (ilen / reg_tuple_size)))) { pr_err("icp_native: ICP reg len (%d) != num servers (%d)", ilen / reg_tuple_size, num_servers); return -1; } for (i = 0; i < (ilen / reg_tuple_size); i++) { struct resource r; int err; err = of_address_to_resource(np, i, &r); if (err) { pr_err("icp_native: Could not translate ICP MMIO" " for interrupt server 0x%x (%d)\n", *indx, err); return -1; } if (icp_native_map_one_cpu(*indx, r.start, r.end - r.start)) return -1; (*indx)++; } return 0; } static const struct icp_ops icp_native_ops = { .get_irq = icp_native_get_irq, .eoi = icp_native_eoi, .set_priority = icp_native_set_cpu_priority, .teardown_cpu = icp_native_teardown_cpu, .flush_ipi = icp_native_flush_ipi, #ifdef CONFIG_SMP .ipi_action = icp_native_ipi_action, .message_pass = icp_native_message_pass, #endif }; int icp_native_init(void) { struct device_node *np; u32 indx = 0; int found = 0; for_each_compatible_node(np, NULL, "ibm,ppc-xicp") if (icp_native_init_one_node(np, &indx) == 0) found = 1; if (!found) { for_each_node_by_type(np, "PowerPC-External-Interrupt-Presentation") { if (icp_native_init_one_node(np, &indx) == 0) found = 1; } } if (found == 0) return -ENODEV; icp_ops = &icp_native_ops; return 0; }