IBM PowerPC 4xx 32-bit PCI controller emulation

This PCI controller can be found on a number of 4xx SoCs, including the 440EP.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Acked-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5862 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 419 insertions, 0 deletions

diff --git a/hw/ppc4xx_pci.c b/hw/ppc4xx_pci.c
new file mode 100644
index 0000000..c76ec19
--- /dev/null
+++ b/hw/ppc4xx_pci.c
@@ -0,0 +1,419 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * 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, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * Authors: Hollis Blanchard <hollisb@us.ibm.com>
+ */
+
+/* This file implements emulation of the 32-bit PCI controller found in some
+ * 4xx SoCs, such as the 440EP. */
+
+#include "hw.h"
+
+typedef target_phys_addr_t pci_addr_t;
+#include "pci.h"
+#include "pci_host.h"
+#include "bswap.h"
+
+#undef DEBUG
+#ifdef DEBUG
+#define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, args...)
+#endif /* DEBUG */
+
+struct PCIMasterMap {
+    uint32_t la;
+    uint32_t ma;
+    uint32_t pcila;
+    uint32_t pciha;
+};
+
+struct PCITargetMap {
+    uint32_t ms;
+    uint32_t la;
+};
+
+#define PPC4xx_PCI_NR_PMMS 3
+#define PPC4xx_PCI_NR_PTMS 2
+
+struct PPC4xxPCIState {
+    struct PCIMasterMap pmm[PPC4xx_PCI_NR_PMMS];
+    struct PCITargetMap ptm[PPC4xx_PCI_NR_PTMS];
+
+    PCIHostState pci_state;
+    PCIDevice *pci_dev;
+};
+typedef struct PPC4xxPCIState PPC4xxPCIState;
+
+#define PCIC0_CFGADDR       0x0
+#define PCIC0_CFGDATA       0x4
+
+/* PLB Memory Map (PMM) registers specify which PLB addresses are translated to
+ * PCI accesses. */
+#define PCIL0_PMM0LA        0x0
+#define PCIL0_PMM0MA        0x4
+#define PCIL0_PMM0PCILA     0x8
+#define PCIL0_PMM0PCIHA     0xc
+#define PCIL0_PMM1LA        0x10
+#define PCIL0_PMM1MA        0x14
+#define PCIL0_PMM1PCILA     0x18
+#define PCIL0_PMM1PCIHA     0x1c
+#define PCIL0_PMM2LA        0x20
+#define PCIL0_PMM2MA        0x24
+#define PCIL0_PMM2PCILA     0x28
+#define PCIL0_PMM2PCIHA     0x2c
+
+/* PCI Target Map (PTM) registers specify which PCI addresses are translated to
+ * PLB accesses. */
+#define PCIL0_PTM1MS        0x30
+#define PCIL0_PTM1LA        0x34
+#define PCIL0_PTM2MS        0x38
+#define PCIL0_PTM2LA        0x3c
+#define PCI_REG_SIZE        0x40
+
+
+static uint32_t pci4xx_cfgaddr_readl(void *opaque, target_phys_addr_t addr)
+{
+    PPC4xxPCIState *ppc4xx_pci = opaque;
+
+    return ppc4xx_pci->pci_state.config_reg;
+}
+
+static CPUReadMemoryFunc *pci4xx_cfgaddr_read[] = {
+    &pci4xx_cfgaddr_readl,
+    &pci4xx_cfgaddr_readl,
+    &pci4xx_cfgaddr_readl,
+};
+
+static void pci4xx_cfgaddr_writel(void *opaque, target_phys_addr_t addr,
+                                  uint32_t value)
+{
+    PPC4xxPCIState *ppc4xx_pci = opaque;
+
+#ifdef TARGET_WORDS_BIGENDIAN
+    value = bswap32(value);
+#endif
+
+    ppc4xx_pci->pci_state.config_reg = value & ~0x3;
+}
+
+static CPUWriteMemoryFunc *pci4xx_cfgaddr_write[] = {
+    &pci4xx_cfgaddr_writel,
+    &pci4xx_cfgaddr_writel,
+    &pci4xx_cfgaddr_writel,
+};
+
+static CPUReadMemoryFunc *pci4xx_cfgdata_read[] = {
+    &pci_host_data_readb,
+    &pci_host_data_readw,
+    &pci_host_data_readl,
+};
+
+static CPUWriteMemoryFunc *pci4xx_cfgdata_write[] = {
+    &pci_host_data_writeb,
+    &pci_host_data_writew,
+    &pci_host_data_writel,
+};
+
+static void ppc4xx_pci_reg_write4(void *opaque, target_phys_addr_t offset,
+                                  uint32_t value)
+{
+    struct PPC4xxPCIState *pci = opaque;
+
+#ifdef TARGET_WORDS_BIGENDIAN
+    value = bswap32(value);
+#endif
+
+    /* We ignore all target attempts at PCI configuration, effectively
+     * assuming a bidirectional 1:1 mapping of PLB and PCI space. */
+
+    switch (offset) {
+    case PCIL0_PMM0LA:
+        pci->pmm[0].la = value;
+        break;
+    case PCIL0_PMM0MA:
+        pci->pmm[0].ma = value;
+        break;
+    case PCIL0_PMM0PCIHA:
+        pci->pmm[0].pciha = value;
+        break;
+    case PCIL0_PMM0PCILA:
+        pci->pmm[0].pcila = value;
+        break;
+
+    case PCIL0_PMM1LA:
+        pci->pmm[1].la = value;
+        break;
+    case PCIL0_PMM1MA:
+        pci->pmm[1].ma = value;
+        break;
+    case PCIL0_PMM1PCIHA:
+        pci->pmm[1].pciha = value;
+        break;
+    case PCIL0_PMM1PCILA:
+        pci->pmm[1].pcila = value;
+        break;
+
+    case PCIL0_PMM2LA:
+        pci->pmm[2].la = value;
+        break;
+    case PCIL0_PMM2MA:
+        pci->pmm[2].ma = value;
+        break;
+    case PCIL0_PMM2PCIHA:
+        pci->pmm[2].pciha = value;
+        break;
+    case PCIL0_PMM2PCILA:
+        pci->pmm[2].pcila = value;
+        break;
+
+    case PCIL0_PTM1MS:
+        pci->ptm[0].ms = value;
+        break;
+    case PCIL0_PTM1LA:
+        pci->ptm[0].la = value;
+        break;
+    case PCIL0_PTM2MS:
+        pci->ptm[1].ms = value;
+        break;
+    case PCIL0_PTM2LA:
+        pci->ptm[1].la = value;
+        break;
+
+    default:
+        printf("%s: unhandled PCI internal register 0x%lx\n", __func__,
+               (unsigned long)offset);
+        break;
+    }
+}
+
+static uint32_t ppc4xx_pci_reg_read4(void *opaque, target_phys_addr_t offset)
+{
+    struct PPC4xxPCIState *pci = opaque;
+    uint32_t value;
+
+    switch (offset) {
+    case PCIL0_PMM0LA:
+        value = pci->pmm[0].la;
+        break;
+    case PCIL0_PMM0MA:
+        value = pci->pmm[0].ma;
+        break;
+    case PCIL0_PMM0PCIHA:
+        value = pci->pmm[0].pciha;
+        break;
+    case PCIL0_PMM0PCILA:
+        value = pci->pmm[0].pcila;
+        break;
+
+    case PCIL0_PMM1LA:
+        value = pci->pmm[1].la;
+        break;
+    case PCIL0_PMM1MA:
+        value = pci->pmm[1].ma;
+        break;
+    case PCIL0_PMM1PCIHA:
+        value = pci->pmm[1].pciha;
+        break;
+    case PCIL0_PMM1PCILA:
+        value = pci->pmm[1].pcila;
+        break;
+
+    case PCIL0_PMM2LA:
+        value = pci->pmm[2].la;
+        break;
+    case PCIL0_PMM2MA:
+        value = pci->pmm[2].ma;
+        break;
+    case PCIL0_PMM2PCIHA:
+        value = pci->pmm[2].pciha;
+        break;
+    case PCIL0_PMM2PCILA:
+        value = pci->pmm[2].pcila;
+        break;
+
+    case PCIL0_PTM1MS:
+        value = pci->ptm[0].ms;
+        break;
+    case PCIL0_PTM1LA:
+        value = pci->ptm[0].la;
+        break;
+    case PCIL0_PTM2MS:
+        value = pci->ptm[1].ms;
+        break;
+    case PCIL0_PTM2LA:
+        value = pci->ptm[1].la;
+        break;
+
+    default:
+        printf("%s: invalid PCI internal register 0x%lx\n", __func__,
+               (unsigned long)offset);
+        value = 0;
+    }
+
+#ifdef TARGET_WORDS_BIGENDIAN
+    value = bswap32(value);
+#endif
+
+    return value;
+}
+
+static CPUReadMemoryFunc *pci_reg_read[] = {
+    &ppc4xx_pci_reg_read4,
+    &ppc4xx_pci_reg_read4,
+    &ppc4xx_pci_reg_read4,
+};
+
+static CPUWriteMemoryFunc *pci_reg_write[] = {
+    &ppc4xx_pci_reg_write4,
+    &ppc4xx_pci_reg_write4,
+    &ppc4xx_pci_reg_write4,
+};
+
+static void ppc4xx_pci_reset(void *opaque)
+{
+    struct PPC4xxPCIState *pci = opaque;
+
+    memset(pci->pmm, 0, sizeof(pci->pmm));
+    memset(pci->ptm, 0, sizeof(pci->ptm));
+}
+
+/* On Bamboo, all pins from each slot are tied to a single board IRQ. This
+ * may need further refactoring for other boards. */
+static int ppc4xx_pci_map_irq(PCIDevice *pci_dev, int irq_num)
+{
+    int slot = pci_dev->devfn >> 3;
+
+    DPRINTF("%s: devfn %x irq %d -> %d\n", __func__,
+            pci_dev->devfn, irq_num, slot);
+
+    return slot - 1;
+}
+
+static void ppc4xx_pci_set_irq(qemu_irq *pci_irqs, int irq_num, int level)
+{
+    DPRINTF("%s: PCI irq %d\n", __func__, irq_num);
+    qemu_set_irq(pci_irqs[irq_num], level);
+}
+
+static void ppc4xx_pci_save(QEMUFile *f, void *opaque)
+{
+    PPC4xxPCIState *controller = opaque;
+    int i;
+
+    pci_device_save(&controller->pci_dev, f);
+
+    for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
+        qemu_put_be32s(f, &controller->pmm[i].la);
+        qemu_put_be32s(f, &controller->pmm[i].ma);
+        qemu_put_be32s(f, &controller->pmm[i].pcila);
+        qemu_put_be32s(f, &controller->pmm[i].pciha);
+    }
+
+    for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
+        qemu_put_be32s(f, &controller->ptm[i].ms);
+        qemu_put_be32s(f, &controller->ptm[i].la);
+    }
+}
+
+static int ppc4xx_pci_load(QEMUFile *f, void *opaque, int version_id)
+{
+    PPC4xxPCIState *controller = opaque;
+    int i;
+
+    if (version_id != 1)
+        return -EINVAL;
+
+    pci_device_load(&controller->pci_dev, f);
+
+    for (i = 0; i < PPC4xx_PCI_NR_PMMS; i++) {
+        qemu_get_be32s(f, &controller->pmm[i].la);
+        qemu_get_be32s(f, &controller->pmm[i].ma);
+        qemu_get_be32s(f, &controller->pmm[i].pcila);
+        qemu_get_be32s(f, &controller->pmm[i].pciha);
+    }
+
+    for (i = 0; i < PPC4xx_PCI_NR_PTMS; i++) {
+        qemu_get_be32s(f, &controller->ptm[i].ms);
+        qemu_get_be32s(f, &controller->ptm[i].la);
+    }
+
+    return 0;
+}
+
+/* XXX Interrupt acknowledge cycles not supported. */
+PCIBus *ppc4xx_pci_init(CPUState *env, qemu_irq pci_irqs[4],
+                        target_phys_addr_t config_space,
+                        target_phys_addr_t int_ack,
+                        target_phys_addr_t special_cycle,
+                        target_phys_addr_t registers)
+{
+    PPC4xxPCIState *controller;
+    int index;
+    static int ppc4xx_pci_id;
+
+    controller = qemu_mallocz(sizeof(PPC4xxPCIState));
+    if (!controller)
+        return NULL;
+
+    controller->pci_state.bus = pci_register_bus(ppc4xx_pci_set_irq,
+                                                 ppc4xx_pci_map_irq,
+                                                 pci_irqs, 0, 4);
+
+    controller->pci_dev = pci_register_device(controller->pci_state.bus,
+                                              "host bridge", sizeof(PCIDevice),
+                                              0, NULL, NULL);
+    controller->pci_dev->config[0x00] = 0x14; // vendor_id
+    controller->pci_dev->config[0x01] = 0x10;
+    controller->pci_dev->config[0x02] = 0x7f; // device_id
+    controller->pci_dev->config[0x03] = 0x02;
+    controller->pci_dev->config[0x0a] = 0x80; // class_sub = other bridge type
+    controller->pci_dev->config[0x0b] = 0x06; // class_base = PCI_bridge
+
+    /* CFGADDR */
+    index = cpu_register_io_memory(0, pci4xx_cfgaddr_read,
+                                   pci4xx_cfgaddr_write, controller);
+    if (index < 0)
+        goto free;
+    cpu_register_physical_memory(config_space + PCIC0_CFGADDR, 4, index);
+
+    /* CFGDATA */
+    index = cpu_register_io_memory(0, pci4xx_cfgdata_read,
+                                   pci4xx_cfgdata_write,
+                                   &controller->pci_state);
+    if (index < 0)
+        goto free;
+    cpu_register_physical_memory(config_space + PCIC0_CFGDATA, 4, index);
+
+    /* Internal registers */
+    index = cpu_register_io_memory(0, pci_reg_read, pci_reg_write, controller);
+    if (index < 0)
+        goto free;
+    cpu_register_physical_memory(registers, PCI_REG_SIZE, index);
+
+    qemu_register_reset(ppc4xx_pci_reset, controller);
+
+    /* XXX load/save code not tested. */
+    register_savevm("ppc4xx_pci", ppc4xx_pci_id++, 1,
+                    ppc4xx_pci_save, ppc4xx_pci_load, controller);
+
+    return controller->pci_state.bus;
+
+free:
+    printf("%s error\n", __func__);
+    qemu_free(controller);
+    return NULL;
+}