[POWERPC] ps3: add interrupt support

Adds routines to interface with the PS3 interrupt services.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

1 files changed, 575 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/ps3/interrupt.c b/arch/powerpc/platforms/ps3/interrupt.c
new file mode 100644
index 000000000000..056c1e4141ba
--- /dev/null
+++ b/arch/powerpc/platforms/ps3/interrupt.c
@@ -0,0 +1,575 @@
+/*
+ *  PS3 interrupt routines.
+ *
+ *  Copyright (C) 2006 Sony Computer Entertainment Inc.
+ *  Copyright 2006 Sony Corp.
+ *
+ *  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; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+
+#include <asm/machdep.h>
+#include <asm/udbg.h>
+#include <asm/ps3.h>
+#include <asm/lv1call.h>
+
+#include "platform.h"
+
+#if defined(DEBUG)
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...) do{if(0)printk(fmt);}while(0)
+#endif
+
+/**
+ * ps3_alloc_io_irq - Assign a virq to a system bus device.
+ * interrupt_id: The device interrupt id read from the system repository.
+ * @virq: The assigned Linux virq.
+ *
+ * An io irq represents a non-virtualized device interrupt.  interrupt_id
+ * coresponds to the interrupt number of the interrupt controller.
+ */
+
+int ps3_alloc_io_irq(unsigned int interrupt_id, unsigned int *virq)
+{
+        int result;
+        unsigned long outlet;
+
+        result = lv1_construct_io_irq_outlet(interrupt_id, &outlet);
+
+        if (result) {
+                pr_debug("%s:%d: lv1_construct_io_irq_outlet failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+                return result;
+        }
+
+        *virq = irq_create_mapping(NULL, outlet);
+
+        pr_debug("%s:%d: interrupt_id %u => outlet %lu, virq %u\n",
+                __func__, __LINE__, interrupt_id, outlet, *virq);
+
+        return 0;
+}
+
+int ps3_free_io_irq(unsigned int virq)
+{
+        int result;
+
+        result = lv1_destruct_io_irq_outlet(virq_to_hw(virq));
+
+        if (!result)
+                pr_debug("%s:%d: lv1_destruct_io_irq_outlet failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+
+        irq_dispose_mapping(virq);
+
+        return result;
+}
+
+/**
+ * ps3_alloc_event_irq - Allocate a virq for use with a system event.
+ * @virq: The assigned Linux virq.
+ *
+ * The virq can be used with lv1_connect_interrupt_event_receive_port() to
+ * arrange to receive events, or with ps3_send_event_locally() to signal
+ * events.
+ */
+
+int ps3_alloc_event_irq(unsigned int *virq)
+{
+        int result;
+        unsigned long outlet;
+
+        result = lv1_construct_event_receive_port(&outlet);
+
+        if (result) {
+                pr_debug("%s:%d: lv1_construct_event_receive_port failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+                *virq = NO_IRQ;
+                return result;
+        }
+
+        *virq = irq_create_mapping(NULL, outlet);
+
+        pr_debug("%s:%d: outlet %lu, virq %u\n", __func__, __LINE__, outlet,
+                *virq);
+
+        return 0;
+}
+
+int ps3_free_event_irq(unsigned int virq)
+{
+        int result;
+
+        pr_debug(" -> %s:%d\n", __func__, __LINE__);
+
+        result = lv1_destruct_event_receive_port(virq_to_hw(virq));
+
+        if (result)
+                pr_debug("%s:%d: lv1_destruct_event_receive_port failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+
+        irq_dispose_mapping(virq);
+
+        pr_debug(" <- %s:%d\n", __func__, __LINE__);
+        return result;
+}
+
+int ps3_send_event_locally(unsigned int virq)
+{
+        return lv1_send_event_locally(virq_to_hw(virq));
+}
+
+/**
+ * ps3_connect_event_irq - Assign a virq to a system bus device.
+ * @did: The HV device identifier read from the system repository.
+ * @interrupt_id: The device interrupt id read from the system repository.
+ * @virq: The assigned Linux virq.
+ *
+ * An event irq represents a virtual device interrupt.  The interrupt_id
+ * coresponds to the software interrupt number.
+ */
+
+int ps3_connect_event_irq(const struct ps3_device_id *did,
+        unsigned int interrupt_id, unsigned int *virq)
+{
+        int result;
+
+        result = ps3_alloc_event_irq(virq);
+
+        if (result)
+                return result;
+
+        result = lv1_connect_interrupt_event_receive_port(did->bus_id,
+                did->dev_id, virq_to_hw(*virq), interrupt_id);
+
+        if (result) {
+                pr_debug("%s:%d: lv1_connect_interrupt_event_receive_port"
+                        " failed: %s\n", __func__, __LINE__,
+                        ps3_result(result));
+                ps3_free_event_irq(*virq);
+                *virq = NO_IRQ;
+                return result;
+        }
+
+        pr_debug("%s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
+                interrupt_id, *virq);
+
+        return 0;
+}
+
+int ps3_disconnect_event_irq(const struct ps3_device_id *did,
+        unsigned int interrupt_id, unsigned int virq)
+{
+        int result;
+
+        pr_debug(" -> %s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
+                interrupt_id, virq);
+
+        result = lv1_disconnect_interrupt_event_receive_port(did->bus_id,
+                did->dev_id, virq_to_hw(virq), interrupt_id);
+
+        if (result)
+                pr_debug("%s:%d: lv1_disconnect_interrupt_event_receive_port"
+                        " failed: %s\n", __func__, __LINE__,
+                        ps3_result(result));
+
+        ps3_free_event_irq(virq);
+
+        pr_debug(" <- %s:%d\n", __func__, __LINE__);
+        return result;
+}
+
+/**
+ * ps3_alloc_vuart_irq - Configure the system virtual uart virq.
+ * @virt_addr_bmp: The caller supplied virtual uart interrupt bitmap.
+ * @virq: The assigned Linux virq.
+ *
+ * The system supports only a single virtual uart, so multiple calls without
+ * freeing the interrupt will return a wrong state error.
+ */
+
+int ps3_alloc_vuart_irq(void* virt_addr_bmp, unsigned int *virq)
+{
+        int result;
+        unsigned long outlet;
+        unsigned long lpar_addr;
+
+        BUG_ON(!is_kernel_addr((unsigned long)virt_addr_bmp));
+
+        lpar_addr = ps3_mm_phys_to_lpar(__pa(virt_addr_bmp));
+
+        result = lv1_configure_virtual_uart_irq(lpar_addr, &outlet);
+
+        if (result) {
+                pr_debug("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+                return result;
+        }
+
+        *virq = irq_create_mapping(NULL, outlet);
+
+        pr_debug("%s:%d: outlet %lu, virq %u\n", __func__, __LINE__,
+                outlet, *virq);
+
+        return 0;
+}
+
+int ps3_free_vuart_irq(unsigned int virq)
+{
+        int result;
+
+        result = lv1_deconfigure_virtual_uart_irq();
+
+        if (result) {
+                pr_debug("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+                return result;
+        }
+
+        irq_dispose_mapping(virq);
+
+        return result;
+}
+
+/**
+ * ps3_alloc_spe_irq - Configure an spe virq.
+ * @spe_id: The spe_id returned from lv1_construct_logical_spe().
+ * @class: The spe interrupt class {0,1,2}.
+ * @virq: The assigned Linux virq.
+ *
+ */
+
+int ps3_alloc_spe_irq(unsigned long spe_id, unsigned int class,
+        unsigned int *virq)
+{
+        int result;
+        unsigned long outlet;
+
+        BUG_ON(class > 2);
+
+        result = lv1_get_spe_irq_outlet(spe_id, class, &outlet);
+
+        if (result) {
+                pr_debug("%s:%d: lv1_get_spe_irq_outlet failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+                return result;
+        }
+
+        *virq = irq_create_mapping(NULL, outlet);
+
+        pr_debug("%s:%d: spe_id %lu, class %u, outlet %lu, virq %u\n",
+                __func__, __LINE__, spe_id, class, outlet, *virq);
+
+        return 0;
+}
+
+int ps3_free_spe_irq(unsigned int virq)
+{
+        irq_dispose_mapping(virq);
+        return 0;
+}
+
+#define PS3_INVALID_OUTLET ((irq_hw_number_t)-1)
+#define PS3_PLUG_MAX 63
+
+/**
+ * struct bmp - a per cpu irq status and mask bitmap structure
+ * @status: 256 bit status bitmap indexed by plug
+ * @unused_1:
+ * @mask: 256 bit mask bitmap indexed by plug
+ * @unused_2:
+ * @lock:
+ * @ipi_debug_brk_mask:
+ *
+ * The HV mantains per SMT thread mappings of HV outlet to HV plug on
+ * behalf of the guest.  These mappings are implemented as 256 bit guest
+ * supplied bitmaps indexed by plug number.  The address of the bitmaps are
+ * registered with the HV through lv1_configure_irq_state_bitmap().
+ *
+ * The HV supports 256 plugs per thread, assigned as {0..255}, for a total
+ * of 512 plugs supported on a processor.  To simplify the logic this
+ * implementation equates HV plug value to linux virq value, constrains each
+ * interrupt to have a system wide unique plug number, and limits the range
+ * of the plug values to map into the first dword of the bitmaps.  This
+ * gives a usable range of plug values of  {NUM_ISA_INTERRUPTS..63}.  Note
+ * that there is no constraint on how many in this set an individual thread
+ * can aquire.
+ */
+
+struct bmp {
+        struct {
+                unsigned long status;
+                unsigned long unused_1[3];
+                unsigned long mask;
+                unsigned long unused_2[3];
+        } __attribute__ ((packed));
+        spinlock_t lock;
+        unsigned long ipi_debug_brk_mask;
+};
+
+/**
+ * struct private - a per cpu data structure
+ * @node: HV node id
+ * @cpu: HV thread id
+ * @bmp: an HV bmp structure
+ */
+
+struct private {
+        unsigned long node;
+        unsigned int cpu;
+        struct bmp bmp;
+};
+
+#if defined(DEBUG)
+static void _dump_64_bmp(const char *header, const unsigned long *p, unsigned cpu,
+        const char* func, int line)
+{
+        pr_debug("%s:%d: %s %u {%04lx_%04lx_%04lx_%04lx}\n",
+                func, line, header, cpu,
+                *p >> 48, (*p >> 32) & 0xffff, (*p >> 16) & 0xffff,
+                *p & 0xffff);
+}
+
+static void __attribute__ ((unused)) _dump_256_bmp(const char *header,
+        const unsigned long *p, unsigned cpu, const char* func, int line)
+{
+        pr_debug("%s:%d: %s %u {%016lx:%016lx:%016lx:%016lx}\n",
+                func, line, header, cpu, p[0], p[1], p[2], p[3]);
+}
+
+#define dump_bmp(_x) _dump_bmp(_x, __func__, __LINE__)
+static void _dump_bmp(struct private* pd, const char* func, int line)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&pd->bmp.lock, flags);
+        _dump_64_bmp("stat", &pd->bmp.status, pd->cpu, func, line);
+        _dump_64_bmp("mask", &pd->bmp.mask, pd->cpu, func, line);
+        spin_unlock_irqrestore(&pd->bmp.lock, flags);
+}
+
+#define dump_mask(_x) _dump_mask(_x, __func__, __LINE__)
+static void __attribute__ ((unused)) _dump_mask(struct private* pd,
+        const char* func, int line)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&pd->bmp.lock, flags);
+        _dump_64_bmp("mask", &pd->bmp.mask, pd->cpu, func, line);
+        spin_unlock_irqrestore(&pd->bmp.lock, flags);
+}
+#else
+static void dump_bmp(struct private* pd) {};
+#endif /* defined(DEBUG) */
+
+static void chip_mask(unsigned int virq)
+{
+        unsigned long flags;
+        struct private *pd = get_irq_chip_data(virq);
+
+        pr_debug("%s:%d: cpu %u, virq %d\n", __func__, __LINE__, pd->cpu, virq);
+
+        BUG_ON(virq < NUM_ISA_INTERRUPTS);
+        BUG_ON(virq > PS3_PLUG_MAX);
+
+        spin_lock_irqsave(&pd->bmp.lock, flags);
+        pd->bmp.mask &= ~(0x8000000000000000UL >> virq);
+        spin_unlock_irqrestore(&pd->bmp.lock, flags);
+
+        lv1_did_update_interrupt_mask(pd->node, pd->cpu);
+}
+
+static void chip_unmask(unsigned int virq)
+{
+        unsigned long flags;
+        struct private *pd = get_irq_chip_data(virq);
+
+        pr_debug("%s:%d: cpu %u, virq %d\n", __func__, __LINE__, pd->cpu, virq);
+
+        BUG_ON(virq < NUM_ISA_INTERRUPTS);
+        BUG_ON(virq > PS3_PLUG_MAX);
+
+        spin_lock_irqsave(&pd->bmp.lock, flags);
+        pd->bmp.mask |= (0x8000000000000000UL >> virq);
+        spin_unlock_irqrestore(&pd->bmp.lock, flags);
+
+        lv1_did_update_interrupt_mask(pd->node, pd->cpu);
+}
+
+static void chip_eoi(unsigned int virq)
+{
+        lv1_end_of_interrupt(virq);
+}
+
+static struct irq_chip irq_chip = {
+        .typename = "ps3",
+        .mask = chip_mask,
+        .unmask = chip_unmask,
+        .eoi = chip_eoi,
+};
+
+static void host_unmap(struct irq_host *h, unsigned int virq)
+{
+        int result;
+
+        pr_debug("%s:%d: virq %d\n", __func__, __LINE__, virq);
+
+        lv1_disconnect_irq_plug(virq);
+
+        result = set_irq_chip_data(virq, NULL);
+        BUG_ON(result);
+}
+
+static DEFINE_PER_CPU(struct private, private);
+
+static int host_map(struct irq_host *h, unsigned int virq,
+        irq_hw_number_t hwirq)
+{
+        int result;
+        unsigned int cpu;
+
+        pr_debug(" -> %s:%d\n", __func__, __LINE__);
+        pr_debug("%s:%d: hwirq %lu => virq %u\n", __func__, __LINE__, hwirq,
+                virq);
+
+        /* bind this virq to a cpu */
+
+        preempt_disable();
+        cpu = smp_processor_id();
+        result = lv1_connect_irq_plug(virq, hwirq);
+        preempt_enable();
+
+        if (result) {
+                pr_info("%s:%d: lv1_connect_irq_plug failed:"
+                        " %s\n", __func__, __LINE__, ps3_result(result));
+                return -EPERM;
+        }
+
+        result = set_irq_chip_data(virq, &per_cpu(private, cpu));
+        BUG_ON(result);
+
+        set_irq_chip_and_handler(virq, &irq_chip, handle_fasteoi_irq);
+
+        pr_debug(" <- %s:%d\n", __func__, __LINE__);
+        return result;
+}
+
+static struct irq_host_ops host_ops = {
+        .map = host_map,
+        .unmap = host_unmap,
+};
+
+void __init ps3_register_ipi_debug_brk(unsigned int cpu, unsigned int virq)
+{
+        struct private *pd = &per_cpu(private, cpu);
+
+        pd->bmp.ipi_debug_brk_mask = 0x8000000000000000UL >> virq;
+
+        pr_debug("%s:%d: cpu %u, virq %u, mask %lxh\n", __func__, __LINE__,
+                cpu, virq, pd->bmp.ipi_debug_brk_mask);
+}
+
+static int bmp_get_and_clear_status_bit(struct bmp *m)
+{
+        unsigned long flags;
+        unsigned int bit;
+        unsigned long x;
+
+        spin_lock_irqsave(&m->lock, flags);
+
+        /* check for ipi break first to stop this cpu ASAP */
+
+        if (m->status & m->ipi_debug_brk_mask) {
+                m->status &= ~m->ipi_debug_brk_mask;
+                spin_unlock_irqrestore(&m->lock, flags);
+                return __ilog2(m->ipi_debug_brk_mask);
+        }
+
+        x = (m->status & m->mask);
+
+        for (bit = NUM_ISA_INTERRUPTS, x <<= bit; x; bit++, x <<= 1)
+                if (x & 0x8000000000000000UL) {
+                        m->status &= ~(0x8000000000000000UL >> bit);
+                        spin_unlock_irqrestore(&m->lock, flags);
+                        return bit;
+                }
+
+        spin_unlock_irqrestore(&m->lock, flags);
+
+        pr_debug("%s:%d: not found\n", __func__, __LINE__);
+        return -1;
+}
+
+unsigned int ps3_get_irq(void)
+{
+        int plug;
+
+        struct private *pd = &__get_cpu_var(private);
+
+        plug = bmp_get_and_clear_status_bit(&pd->bmp);
+
+        if (plug < 1) {
+                pr_debug("%s:%d: no plug found: cpu %u\n", __func__, __LINE__,
+                        pd->cpu);
+                dump_bmp(&per_cpu(private, 0));
+                dump_bmp(&per_cpu(private, 1));
+                return NO_IRQ;
+        }
+
+#if defined(DEBUG)
+        if (plug < NUM_ISA_INTERRUPTS || plug > PS3_PLUG_MAX) {
+                dump_bmp(&per_cpu(private, 0));
+                dump_bmp(&per_cpu(private, 1));
+                BUG();
+        }
+#endif
+        return plug;
+}
+
+void __init ps3_init_IRQ(void)
+{
+        int result;
+        unsigned long node;
+        unsigned cpu;
+        struct irq_host *host;
+
+        lv1_get_logical_ppe_id(&node);
+
+        host = irq_alloc_host(IRQ_HOST_MAP_NOMAP, 0, &host_ops,
+                PS3_INVALID_OUTLET);
+        irq_set_default_host(host);
+        irq_set_virq_count(PS3_PLUG_MAX + 1);
+
+        for_each_possible_cpu(cpu) {
+                struct private *pd = &per_cpu(private, cpu);
+
+                pd->node = node;
+                pd->cpu = cpu;
+                spin_lock_init(&pd->bmp.lock);
+
+                result = lv1_configure_irq_state_bitmap(node, cpu,
+                        ps3_mm_phys_to_lpar(__pa(&pd->bmp.status)));
+
+                if (result)
+                        pr_debug("%s:%d: lv1_configure_irq_state_bitmap failed:"
+                                " %s\n", __func__, __LINE__,
+                                ps3_result(result));
+        }
+
+        ppc_md.get_irq = ps3_get_irq;
+}