hw/riscv: Move sifive_plic model to hw/intc

This is an effort to clean up the hw/riscv directory. Ideally it
should only contain the RISC-V SoC / machine codes plus generic
codes. Let's move sifive_plic model to hw/intc directory.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <1599129623-68957-7-git-send-email-bmeng.cn@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

1 files changed, 0 insertions, 524 deletions

diff --git a/hw/riscv/sifive_plic.c b/hw/riscv/sifive_plic.c
deleted file mode 100644
index 11ef147606..0000000000
--- a/hw/riscv/sifive_plic.c
+++ /dev/null
@@ -1,524 +0,0 @@
-/*
- * SiFive PLIC (Platform Level Interrupt Controller)
- *
- * Copyright (c) 2017 SiFive, Inc.
- *
- * This provides a parameterizable interrupt controller based on SiFive's PLIC.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2 or later, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
- */
-
-#include "qemu/osdep.h"
-#include "qapi/error.h"
-#include "qemu/log.h"
-#include "qemu/module.h"
-#include "qemu/error-report.h"
-#include "hw/sysbus.h"
-#include "hw/pci/msi.h"
-#include "hw/boards.h"
-#include "hw/qdev-properties.h"
-#include "target/riscv/cpu.h"
-#include "sysemu/sysemu.h"
-#include "hw/riscv/sifive_plic.h"
-
-#define RISCV_DEBUG_PLIC 0
-
-static PLICMode char_to_mode(char c)
-{
-    switch (c) {
-    case 'U': return PLICMode_U;
-    case 'S': return PLICMode_S;
-    case 'H': return PLICMode_H;
-    case 'M': return PLICMode_M;
-    default:
-        error_report("plic: invalid mode '%c'", c);
-        exit(1);
-    }
-}
-
-static char mode_to_char(PLICMode m)
-{
-    switch (m) {
-    case PLICMode_U: return 'U';
-    case PLICMode_S: return 'S';
-    case PLICMode_H: return 'H';
-    case PLICMode_M: return 'M';
-    default: return '?';
-    }
-}
-
-static void sifive_plic_print_state(SiFivePLICState *plic)
-{
-    int i;
-    int addrid;
-
-    /* pending */
-    qemu_log("pending       : ");
-    for (i = plic->bitfield_words - 1; i >= 0; i--) {
-        qemu_log("%08x", plic->pending[i]);
-    }
-    qemu_log("\n");
-
-    /* pending */
-    qemu_log("claimed       : ");
-    for (i = plic->bitfield_words - 1; i >= 0; i--) {
-        qemu_log("%08x", plic->claimed[i]);
-    }
-    qemu_log("\n");
-
-    for (addrid = 0; addrid < plic->num_addrs; addrid++) {
-        qemu_log("hart%d-%c enable: ",
-            plic->addr_config[addrid].hartid,
-            mode_to_char(plic->addr_config[addrid].mode));
-        for (i = plic->bitfield_words - 1; i >= 0; i--) {
-            qemu_log("%08x", plic->enable[addrid * plic->bitfield_words + i]);
-        }
-        qemu_log("\n");
-    }
-}
-
-static uint32_t atomic_set_masked(uint32_t *a, uint32_t mask, uint32_t value)
-{
-    uint32_t old, new, cmp = atomic_read(a);
-
-    do {
-        old = cmp;
-        new = (old & ~mask) | (value & mask);
-        cmp = atomic_cmpxchg(a, old, new);
-    } while (old != cmp);
-
-    return old;
-}
-
-static void sifive_plic_set_pending(SiFivePLICState *plic, int irq, bool level)
-{
-    atomic_set_masked(&plic->pending[irq >> 5], 1 << (irq & 31), -!!level);
-}
-
-static void sifive_plic_set_claimed(SiFivePLICState *plic, int irq, bool level)
-{
-    atomic_set_masked(&plic->claimed[irq >> 5], 1 << (irq & 31), -!!level);
-}
-
-static int sifive_plic_irqs_pending(SiFivePLICState *plic, uint32_t addrid)
-{
-    int i, j;
-    for (i = 0; i < plic->bitfield_words; i++) {
-        uint32_t pending_enabled_not_claimed =
-            (plic->pending[i] & ~plic->claimed[i]) &
-            plic->enable[addrid * plic->bitfield_words + i];
-        if (!pending_enabled_not_claimed) {
-            continue;
-        }
-        for (j = 0; j < 32; j++) {
-            int irq = (i << 5) + j;
-            uint32_t prio = plic->source_priority[irq];
-            int enabled = pending_enabled_not_claimed & (1 << j);
-            if (enabled && prio > plic->target_priority[addrid]) {
-                return 1;
-            }
-        }
-    }
-    return 0;
-}
-
-static void sifive_plic_update(SiFivePLICState *plic)
-{
-    int addrid;
-
-    /* raise irq on harts where this irq is enabled */
-    for (addrid = 0; addrid < plic->num_addrs; addrid++) {
-        uint32_t hartid = plic->addr_config[addrid].hartid;
-        PLICMode mode = plic->addr_config[addrid].mode;
-        CPUState *cpu = qemu_get_cpu(hartid);
-        CPURISCVState *env = cpu ? cpu->env_ptr : NULL;
-        if (!env) {
-            continue;
-        }
-        int level = sifive_plic_irqs_pending(plic, addrid);
-        switch (mode) {
-        case PLICMode_M:
-            riscv_cpu_update_mip(RISCV_CPU(cpu), MIP_MEIP, BOOL_TO_MASK(level));
-            break;
-        case PLICMode_S:
-            riscv_cpu_update_mip(RISCV_CPU(cpu), MIP_SEIP, BOOL_TO_MASK(level));
-            break;
-        default:
-            break;
-        }
-    }
-
-    if (RISCV_DEBUG_PLIC) {
-        sifive_plic_print_state(plic);
-    }
-}
-
-static uint32_t sifive_plic_claim(SiFivePLICState *plic, uint32_t addrid)
-{
-    int i, j;
-    uint32_t max_irq = 0;
-    uint32_t max_prio = plic->target_priority[addrid];
-
-    for (i = 0; i < plic->bitfield_words; i++) {
-        uint32_t pending_enabled_not_claimed =
-            (plic->pending[i] & ~plic->claimed[i]) &
-            plic->enable[addrid * plic->bitfield_words + i];
-        if (!pending_enabled_not_claimed) {
-            continue;
-        }
-        for (j = 0; j < 32; j++) {
-            int irq = (i << 5) + j;
-            uint32_t prio = plic->source_priority[irq];
-            int enabled = pending_enabled_not_claimed & (1 << j);
-            if (enabled && prio > max_prio) {
-                max_irq = irq;
-                max_prio = prio;
-            }
-        }
-    }
-
-    if (max_irq) {
-        sifive_plic_set_pending(plic, max_irq, false);
-        sifive_plic_set_claimed(plic, max_irq, true);
-    }
-    return max_irq;
-}
-
-static uint64_t sifive_plic_read(void *opaque, hwaddr addr, unsigned size)
-{
-    SiFivePLICState *plic = opaque;
-
-    /* writes must be 4 byte words */
-    if ((addr & 0x3) != 0) {
-        goto err;
-    }
-
-    if (addr >= plic->priority_base && /* 4 bytes per source */
-        addr < plic->priority_base + (plic->num_sources << 2))
-    {
-        uint32_t irq = ((addr - plic->priority_base) >> 2) + 1;
-        if (RISCV_DEBUG_PLIC) {
-            qemu_log("plic: read priority: irq=%d priority=%d\n",
-                irq, plic->source_priority[irq]);
-        }
-        return plic->source_priority[irq];
-    } else if (addr >= plic->pending_base && /* 1 bit per source */
-               addr < plic->pending_base + (plic->num_sources >> 3))
-    {
-        uint32_t word = (addr - plic->pending_base) >> 2;
-        if (RISCV_DEBUG_PLIC) {
-            qemu_log("plic: read pending: word=%d value=%d\n",
-                word, plic->pending[word]);
-        }
-        return plic->pending[word];
-    } else if (addr >= plic->enable_base && /* 1 bit per source */
-             addr < plic->enable_base + plic->num_addrs * plic->enable_stride)
-    {
-        uint32_t addrid = (addr - plic->enable_base) / plic->enable_stride;
-        uint32_t wordid = (addr & (plic->enable_stride - 1)) >> 2;
-        if (wordid < plic->bitfield_words) {
-            if (RISCV_DEBUG_PLIC) {
-                qemu_log("plic: read enable: hart%d-%c word=%d value=%x\n",
-                    plic->addr_config[addrid].hartid,
-                    mode_to_char(plic->addr_config[addrid].mode), wordid,
-                    plic->enable[addrid * plic->bitfield_words + wordid]);
-            }
-            return plic->enable[addrid * plic->bitfield_words + wordid];
-        }
-    } else if (addr >= plic->context_base && /* 1 bit per source */
-             addr < plic->context_base + plic->num_addrs * plic->context_stride)
-    {
-        uint32_t addrid = (addr - plic->context_base) / plic->context_stride;
-        uint32_t contextid = (addr & (plic->context_stride - 1));
-        if (contextid == 0) {
-            if (RISCV_DEBUG_PLIC) {
-                qemu_log("plic: read priority: hart%d-%c priority=%x\n",
-                    plic->addr_config[addrid].hartid,
-                    mode_to_char(plic->addr_config[addrid].mode),
-                    plic->target_priority[addrid]);
-            }
-            return plic->target_priority[addrid];
-        } else if (contextid == 4) {
-            uint32_t value = sifive_plic_claim(plic, addrid);
-            if (RISCV_DEBUG_PLIC) {
-                qemu_log("plic: read claim: hart%d-%c irq=%x\n",
-                    plic->addr_config[addrid].hartid,
-                    mode_to_char(plic->addr_config[addrid].mode),
-                    value);
-            }
-            sifive_plic_update(plic);
-            return value;
-        }
-    }
-
-err:
-    qemu_log_mask(LOG_GUEST_ERROR,
-                  "%s: Invalid register read 0x%" HWADDR_PRIx "\n",
-                  __func__, addr);
-    return 0;
-}
-
-static void sifive_plic_write(void *opaque, hwaddr addr, uint64_t value,
-        unsigned size)
-{
-    SiFivePLICState *plic = opaque;
-
-    /* writes must be 4 byte words */
-    if ((addr & 0x3) != 0) {
-        goto err;
-    }
-
-    if (addr >= plic->priority_base && /* 4 bytes per source */
-        addr < plic->priority_base + (plic->num_sources << 2))
-    {
-        uint32_t irq = ((addr - plic->priority_base) >> 2) + 1;
-        plic->source_priority[irq] = value & 7;
-        if (RISCV_DEBUG_PLIC) {
-            qemu_log("plic: write priority: irq=%d priority=%d\n",
-                irq, plic->source_priority[irq]);
-        }
-        sifive_plic_update(plic);
-        return;
-    } else if (addr >= plic->pending_base && /* 1 bit per source */
-               addr < plic->pending_base + (plic->num_sources >> 3))
-    {
-        qemu_log_mask(LOG_GUEST_ERROR,
-                      "%s: invalid pending write: 0x%" HWADDR_PRIx "",
-                      __func__, addr);
-        return;
-    } else if (addr >= plic->enable_base && /* 1 bit per source */
-        addr < plic->enable_base + plic->num_addrs * plic->enable_stride)
-    {
-        uint32_t addrid = (addr - plic->enable_base) / plic->enable_stride;
-        uint32_t wordid = (addr & (plic->enable_stride - 1)) >> 2;
-        if (wordid < plic->bitfield_words) {
-            plic->enable[addrid * plic->bitfield_words + wordid] = value;
-            if (RISCV_DEBUG_PLIC) {
-                qemu_log("plic: write enable: hart%d-%c word=%d value=%x\n",
-                    plic->addr_config[addrid].hartid,
-                    mode_to_char(plic->addr_config[addrid].mode), wordid,
-                    plic->enable[addrid * plic->bitfield_words + wordid]);
-            }
-            return;
-        }
-    } else if (addr >= plic->context_base && /* 4 bytes per reg */
-        addr < plic->context_base + plic->num_addrs * plic->context_stride)
-    {
-        uint32_t addrid = (addr - plic->context_base) / plic->context_stride;
-        uint32_t contextid = (addr & (plic->context_stride - 1));
-        if (contextid == 0) {
-            if (RISCV_DEBUG_PLIC) {
-                qemu_log("plic: write priority: hart%d-%c priority=%x\n",
-                    plic->addr_config[addrid].hartid,
-                    mode_to_char(plic->addr_config[addrid].mode),
-                    plic->target_priority[addrid]);
-            }
-            if (value <= plic->num_priorities) {
-                plic->target_priority[addrid] = value;
-                sifive_plic_update(plic);
-            }
-            return;
-        } else if (contextid == 4) {
-            if (RISCV_DEBUG_PLIC) {
-                qemu_log("plic: write claim: hart%d-%c irq=%x\n",
-                    plic->addr_config[addrid].hartid,
-                    mode_to_char(plic->addr_config[addrid].mode),
-                    (uint32_t)value);
-            }
-            if (value < plic->num_sources) {
-                sifive_plic_set_claimed(plic, value, false);
-                sifive_plic_update(plic);
-            }
-            return;
-        }
-    }
-
-err:
-    qemu_log_mask(LOG_GUEST_ERROR,
-                  "%s: Invalid register write 0x%" HWADDR_PRIx "\n",
-                  __func__, addr);
-}
-
-static const MemoryRegionOps sifive_plic_ops = {
-    .read = sifive_plic_read,
-    .write = sifive_plic_write,
-    .endianness = DEVICE_LITTLE_ENDIAN,
-    .valid = {
-        .min_access_size = 4,
-        .max_access_size = 4
-    }
-};
-
-static Property sifive_plic_properties[] = {
-    DEFINE_PROP_STRING("hart-config", SiFivePLICState, hart_config),
-    DEFINE_PROP_UINT32("hartid-base", SiFivePLICState, hartid_base, 0),
-    DEFINE_PROP_UINT32("num-sources", SiFivePLICState, num_sources, 0),
-    DEFINE_PROP_UINT32("num-priorities", SiFivePLICState, num_priorities, 0),
-    DEFINE_PROP_UINT32("priority-base", SiFivePLICState, priority_base, 0),
-    DEFINE_PROP_UINT32("pending-base", SiFivePLICState, pending_base, 0),
-    DEFINE_PROP_UINT32("enable-base", SiFivePLICState, enable_base, 0),
-    DEFINE_PROP_UINT32("enable-stride", SiFivePLICState, enable_stride, 0),
-    DEFINE_PROP_UINT32("context-base", SiFivePLICState, context_base, 0),
-    DEFINE_PROP_UINT32("context-stride", SiFivePLICState, context_stride, 0),
-    DEFINE_PROP_UINT32("aperture-size", SiFivePLICState, aperture_size, 0),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
-/*
- * parse PLIC hart/mode address offset config
- *
- * "M"              1 hart with M mode
- * "MS,MS"          2 harts, 0-1 with M and S mode
- * "M,MS,MS,MS,MS"  5 harts, 0 with M mode, 1-5 with M and S mode
- */
-static void parse_hart_config(SiFivePLICState *plic)
-{
-    int addrid, hartid, modes;
-    const char *p;
-    char c;
-
-    /* count and validate hart/mode combinations */
-    addrid = 0, hartid = 0, modes = 0;
-    p = plic->hart_config;
-    while ((c = *p++)) {
-        if (c == ',') {
-            addrid += ctpop8(modes);
-            modes = 0;
-            hartid++;
-        } else {
-            int m = 1 << char_to_mode(c);
-            if (modes == (modes | m)) {
-                error_report("plic: duplicate mode '%c' in config: %s",
-                             c, plic->hart_config);
-                exit(1);
-            }
-            modes |= m;
-        }
-    }
-    if (modes) {
-        addrid += ctpop8(modes);
-    }
-    hartid++;
-
-    plic->num_addrs = addrid;
-    plic->num_harts = hartid;
-
-    /* store hart/mode combinations */
-    plic->addr_config = g_new(PLICAddr, plic->num_addrs);
-    addrid = 0, hartid = plic->hartid_base;
-    p = plic->hart_config;
-    while ((c = *p++)) {
-        if (c == ',') {
-            hartid++;
-        } else {
-            plic->addr_config[addrid].addrid = addrid;
-            plic->addr_config[addrid].hartid = hartid;
-            plic->addr_config[addrid].mode = char_to_mode(c);
-            addrid++;
-        }
-    }
-}
-
-static void sifive_plic_irq_request(void *opaque, int irq, int level)
-{
-    SiFivePLICState *plic = opaque;
-    if (RISCV_DEBUG_PLIC) {
-        qemu_log("sifive_plic_irq_request: irq=%d level=%d\n", irq, level);
-    }
-    sifive_plic_set_pending(plic, irq, level > 0);
-    sifive_plic_update(plic);
-}
-
-static void sifive_plic_realize(DeviceState *dev, Error **errp)
-{
-    SiFivePLICState *plic = SIFIVE_PLIC(dev);
-    int i;
-
-    memory_region_init_io(&plic->mmio, OBJECT(dev), &sifive_plic_ops, plic,
-                          TYPE_SIFIVE_PLIC, plic->aperture_size);
-    parse_hart_config(plic);
-    plic->bitfield_words = (plic->num_sources + 31) >> 5;
-    plic->source_priority = g_new0(uint32_t, plic->num_sources);
-    plic->target_priority = g_new(uint32_t, plic->num_addrs);
-    plic->pending = g_new0(uint32_t, plic->bitfield_words);
-    plic->claimed = g_new0(uint32_t, plic->bitfield_words);
-    plic->enable = g_new0(uint32_t, plic->bitfield_words * plic->num_addrs);
-    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &plic->mmio);
-    qdev_init_gpio_in(dev, sifive_plic_irq_request, plic->num_sources);
-
-    /* We can't allow the supervisor to control SEIP as this would allow the
-     * supervisor to clear a pending external interrupt which will result in
-     * lost a interrupt in the case a PLIC is attached. The SEIP bit must be
-     * hardware controlled when a PLIC is attached.
-     */
-    for (i = 0; i < plic->num_harts; i++) {
-        RISCVCPU *cpu = RISCV_CPU(qemu_get_cpu(plic->hartid_base + i));
-        if (riscv_cpu_claim_interrupts(cpu, MIP_SEIP) < 0) {
-            error_report("SEIP already claimed");
-            exit(1);
-        }
-    }
-
-    msi_nonbroken = true;
-}
-
-static void sifive_plic_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-
-    device_class_set_props(dc, sifive_plic_properties);
-    dc->realize = sifive_plic_realize;
-}
-
-static const TypeInfo sifive_plic_info = {
-    .name          = TYPE_SIFIVE_PLIC,
-    .parent        = TYPE_SYS_BUS_DEVICE,
-    .instance_size = sizeof(SiFivePLICState),
-    .class_init    = sifive_plic_class_init,
-};
-
-static void sifive_plic_register_types(void)
-{
-    type_register_static(&sifive_plic_info);
-}
-
-type_init(sifive_plic_register_types)
-
-/*
- * Create PLIC device.
- */
-DeviceState *sifive_plic_create(hwaddr addr, char *hart_config,
-    uint32_t hartid_base, uint32_t num_sources,
-    uint32_t num_priorities, uint32_t priority_base,
-    uint32_t pending_base, uint32_t enable_base,
-    uint32_t enable_stride, uint32_t context_base,
-    uint32_t context_stride, uint32_t aperture_size)
-{
-    DeviceState *dev = qdev_new(TYPE_SIFIVE_PLIC);
-    assert(enable_stride == (enable_stride & -enable_stride));
-    assert(context_stride == (context_stride & -context_stride));
-    qdev_prop_set_string(dev, "hart-config", hart_config);
-    qdev_prop_set_uint32(dev, "hartid-base", hartid_base);
-    qdev_prop_set_uint32(dev, "num-sources", num_sources);
-    qdev_prop_set_uint32(dev, "num-priorities", num_priorities);
-    qdev_prop_set_uint32(dev, "priority-base", priority_base);
-    qdev_prop_set_uint32(dev, "pending-base", pending_base);
-    qdev_prop_set_uint32(dev, "enable-base", enable_base);
-    qdev_prop_set_uint32(dev, "enable-stride", enable_stride);
-    qdev_prop_set_uint32(dev, "context-base", context_base);
-    qdev_prop_set_uint32(dev, "context-stride", context_stride);
-    qdev_prop_set_uint32(dev, "aperture-size", aperture_size);
-    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
-    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, addr);
-    return dev;
-}