hppa: Add support for LASI chip with i82596 NIC

LASI is a built-in multi-I/O chip which supports serial, parallel,
network (Intel i82596 Apricot), sound and other functionalities.
LASI has been used in many HP PARISC machines.
This patch adds the necessary parts to allow Linux and HP-UX to detect
LASI and the network card.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Message-Id: <20191220211512.3289-3-svens@stackframe.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 360 insertions, 0 deletions

diff --git a/hw/hppa/lasi.c b/hw/hppa/lasi.c
new file mode 100644
index 0000000000..51752589f3
--- /dev/null
+++ b/hw/hppa/lasi.c
@@ -0,0 +1,360 @@
+/*
+ * HP-PARISC Lasi chipset emulation.
+ *
+ * (C) 2019 by Helge Deller <deller@gmx.de>
+ *
+ * This work is licensed under the GNU GPL license version 2 or later.
+ *
+ * Documentation available at:
+ * https://parisc.wiki.kernel.org/images-parisc/7/79/Lasi_ers.pdf
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/units.h"
+#include "qapi/error.h"
+#include "cpu.h"
+#include "trace.h"
+#include "hw/hw.h"
+#include "hw/irq.h"
+#include "sysemu/sysemu.h"
+#include "sysemu/runstate.h"
+#include "hppa_sys.h"
+#include "hw/net/lasi_82596.h"
+#include "hw/char/parallel.h"
+#include "hw/char/serial.h"
+#include "exec/address-spaces.h"
+#include "migration/vmstate.h"
+
+#define TYPE_LASI_CHIP "lasi-chip"
+
+#define LASI_IRR        0x00    /* RO */
+#define LASI_IMR        0x04
+#define LASI_IPR        0x08
+#define LASI_ICR        0x0c
+#define LASI_IAR        0x10
+
+#define LASI_PCR        0x0C000 /* LASI Power Control register */
+#define LASI_ERRLOG     0x0C004 /* LASI Error Logging register */
+#define LASI_VER        0x0C008 /* LASI Version Control register */
+#define LASI_IORESET    0x0C00C /* LASI I/O Reset register */
+#define LASI_AMR        0x0C010 /* LASI Arbitration Mask register */
+#define LASI_IO_CONF    0x7FFFE /* LASI primary configuration register */
+#define LASI_IO_CONF2   0x7FFFF /* LASI secondary configuration register */
+
+#define LASI_BIT(x)     (1ul << (x))
+#define LASI_IRQ_BITS   (LASI_BIT(5) | LASI_BIT(7) | LASI_BIT(8) | LASI_BIT(9) \
+            | LASI_BIT(13) | LASI_BIT(14) | LASI_BIT(16) | LASI_BIT(17) \
+            | LASI_BIT(18) | LASI_BIT(19) | LASI_BIT(20) | LASI_BIT(21) \
+            | LASI_BIT(26))
+
+#define ICR_BUS_ERROR_BIT  LASI_BIT(8)  /* bit 8 in ICR */
+#define ICR_TOC_BIT        LASI_BIT(1)  /* bit 1 in ICR */
+
+#define LASI_CHIP(obj) \
+    OBJECT_CHECK(LasiState, (obj), TYPE_LASI_CHIP)
+
+#define LASI_RTC_HPA    (LASI_HPA + 0x9000)
+
+typedef struct LasiState {
+    PCIHostState parent_obj;
+
+    uint32_t irr;
+    uint32_t imr;
+    uint32_t ipr;
+    uint32_t icr;
+    uint32_t iar;
+
+    uint32_t errlog;
+    uint32_t amr;
+    uint32_t rtc;
+    time_t rtc_ref;
+
+    MemoryRegion this_mem;
+} LasiState;
+
+static bool lasi_chip_mem_valid(void *opaque, hwaddr addr,
+                                unsigned size, bool is_write,
+                                MemTxAttrs attrs)
+{
+    bool ret = false;
+
+    switch (addr) {
+    case LASI_IRR:
+    case LASI_IMR:
+    case LASI_IPR:
+    case LASI_ICR:
+    case LASI_IAR:
+
+    case (LASI_LAN_HPA - LASI_HPA):
+    case (LASI_LPT_HPA - LASI_HPA):
+    case (LASI_UART_HPA - LASI_HPA):
+    case (LASI_RTC_HPA - LASI_HPA):
+
+    case LASI_PCR ... LASI_AMR:
+        ret = true;
+    }
+
+    trace_lasi_chip_mem_valid(addr, ret);
+    return ret;
+}
+
+static MemTxResult lasi_chip_read_with_attrs(void *opaque, hwaddr addr,
+                                             uint64_t *data, unsigned size,
+                                             MemTxAttrs attrs)
+{
+    LasiState *s = opaque;
+    MemTxResult ret = MEMTX_OK;
+    uint32_t val;
+
+    switch (addr) {
+    case LASI_IRR:
+        val = s->irr;
+        break;
+    case LASI_IMR:
+        val = s->imr;
+        break;
+    case LASI_IPR:
+        val = s->ipr;
+        /* Any read to IPR clears the register.  */
+        s->ipr = 0;
+        break;
+    case LASI_ICR:
+        val = s->icr & ICR_BUS_ERROR_BIT; /* bus_error */
+        break;
+    case LASI_IAR:
+        val = s->iar;
+        break;
+
+    case (LASI_LAN_HPA - LASI_HPA):
+    case (LASI_LPT_HPA - LASI_HPA):
+    case (LASI_UART_HPA - LASI_HPA):
+        val = 0;
+        break;
+    case (LASI_RTC_HPA - LASI_HPA):
+        val = time(NULL);
+        val += s->rtc_ref;
+        break;
+
+    case LASI_PCR:
+    case LASI_VER:      /* only version 0 existed. */
+    case LASI_IORESET:
+        val = 0;
+        break;
+    case LASI_ERRLOG:
+        val = s->errlog;
+        break;
+    case LASI_AMR:
+        val = s->amr;
+        break;
+
+    default:
+        /* Controlled by lasi_chip_mem_valid above. */
+        g_assert_not_reached();
+    }
+
+    trace_lasi_chip_read(addr, val);
+
+    *data = val;
+    return ret;
+}
+
+static MemTxResult lasi_chip_write_with_attrs(void *opaque, hwaddr addr,
+                                              uint64_t val, unsigned size,
+                                              MemTxAttrs attrs)
+{
+    LasiState *s = opaque;
+
+    trace_lasi_chip_write(addr, val);
+
+    switch (addr) {
+    case LASI_IRR:
+        /* read-only.  */
+        break;
+    case LASI_IMR:
+        s->imr = val;  /* 0x20 ?? */
+        assert((val & LASI_IRQ_BITS) == val);
+        break;
+    case LASI_IPR:
+        /* Any write to IPR clears the register. */
+        s->ipr = 0;
+        break;
+    case LASI_ICR:
+        s->icr = val;
+        /* if (val & ICR_TOC_BIT) issue_toc(); */
+        break;
+    case LASI_IAR:
+        s->iar = val;
+        break;
+
+    case (LASI_LAN_HPA - LASI_HPA):
+        /* XXX: reset LAN card */
+        break;
+    case (LASI_LPT_HPA - LASI_HPA):
+        /* XXX: reset parallel port */
+        break;
+    case (LASI_UART_HPA - LASI_HPA):
+        /* XXX: reset serial port */
+        break;
+    case (LASI_RTC_HPA - LASI_HPA):
+        s->rtc_ref = val - time(NULL);
+        break;
+
+    case LASI_PCR:
+        if (val == 0x02) /* immediately power off */
+            qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
+        break;
+    case LASI_ERRLOG:
+        s->errlog = val;
+        break;
+    case LASI_VER:
+        /* read-only.  */
+        break;
+    case LASI_IORESET:
+        break;  /* XXX: TODO: Reset various devices. */
+    case LASI_AMR:
+        s->amr = val;
+        break;
+
+    default:
+        /* Controlled by lasi_chip_mem_valid above. */
+        g_assert_not_reached();
+    }
+    return MEMTX_OK;
+}
+
+static const MemoryRegionOps lasi_chip_ops = {
+    .read_with_attrs = lasi_chip_read_with_attrs,
+    .write_with_attrs = lasi_chip_write_with_attrs,
+    .endianness = DEVICE_BIG_ENDIAN,
+    .valid = {
+        .min_access_size = 1,
+        .max_access_size = 4,
+        .accepts = lasi_chip_mem_valid,
+    },
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 4,
+    },
+};
+
+static const VMStateDescription vmstate_lasi = {
+    .name = "Lasi",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(irr, LasiState),
+        VMSTATE_UINT32(imr, LasiState),
+        VMSTATE_UINT32(ipr, LasiState),
+        VMSTATE_UINT32(icr, LasiState),
+        VMSTATE_UINT32(iar, LasiState),
+        VMSTATE_UINT32(errlog, LasiState),
+        VMSTATE_UINT32(amr, LasiState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+
+static void lasi_set_irq(void *opaque, int irq, int level)
+{
+    LasiState *s = opaque;
+    uint32_t bit = 1u << irq;
+
+    if (level) {
+        s->ipr |= bit;
+        if (bit & s->imr) {
+            uint32_t iar = s->iar;
+            s->irr |= bit;
+            if ((s->icr & ICR_BUS_ERROR_BIT) == 0) {
+                stl_be_phys(&address_space_memory, iar & -32, iar & 31);
+            }
+        }
+    }
+}
+
+static int lasi_get_irq(unsigned long hpa)
+{
+    switch (hpa) {
+    case LASI_HPA:
+        return 14;
+    case LASI_UART_HPA:
+        return 5;
+    case LASI_LPT_HPA:
+        return 7;
+    case LASI_LAN_HPA:
+        return 8;
+    case LASI_SCSI_HPA:
+        return 9;
+    case LASI_AUDIO_HPA:
+        return 13;
+    case LASI_PS2KBD_HPA:
+    case LASI_PS2MOU_HPA:
+        return 26;
+    default:
+        g_assert_not_reached();
+    }
+}
+
+DeviceState *lasi_init(MemoryRegion *address_space)
+{
+    DeviceState *dev;
+    LasiState *s;
+
+    dev = qdev_create(NULL, TYPE_LASI_CHIP);
+    s = LASI_CHIP(dev);
+    s->iar = CPU_HPA + 3;
+
+    /* Lasi access from main memory.  */
+    memory_region_init_io(&s->this_mem, OBJECT(s), &lasi_chip_ops,
+                          s, "lasi", 0x100000);
+    memory_region_add_subregion(address_space, LASI_HPA, &s->this_mem);
+
+    qdev_init_nofail(dev);
+
+    /* LAN */
+    if (enable_lasi_lan()) {
+        qemu_irq lan_irq = qemu_allocate_irq(lasi_set_irq, s,
+                lasi_get_irq(LASI_LAN_HPA));
+        lasi_82596_init(address_space, LASI_LAN_HPA, lan_irq);
+    }
+
+    /* Parallel port */
+    qemu_irq lpt_irq = qemu_allocate_irq(lasi_set_irq, s,
+            lasi_get_irq(LASI_LPT_HPA));
+    parallel_mm_init(address_space, LASI_LPT_HPA + 0x800, 0,
+                     lpt_irq, parallel_hds[0]);
+
+    /* Real time clock (RTC), it's only one 32-bit counter @9000 */
+    s->rtc = time(NULL);
+    s->rtc_ref = 0;
+
+    if (serial_hd(1)) {
+        /* Serial port */
+        qemu_irq serial_irq = qemu_allocate_irq(lasi_set_irq, s,
+                lasi_get_irq(LASI_UART_HPA));
+        serial_mm_init(address_space, LASI_UART_HPA + 0x800, 0,
+                serial_irq, 8000000 / 16,
+                serial_hd(1), DEVICE_NATIVE_ENDIAN);
+    }
+    return dev;
+}
+
+static void lasi_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->vmsd = &vmstate_lasi;
+}
+
+static const TypeInfo lasi_pcihost_info = {
+    .name          = TYPE_LASI_CHIP,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(LasiState),
+    .class_init    = lasi_class_init,
+};
+
+static void lasi_register_types(void)
+{
+    type_register_static(&lasi_pcihost_info);
+}
+
+type_init(lasi_register_types)