diff options
Diffstat (limited to 'hw/milkymist-sysctl.c')
| -rw-r--r-- | hw/milkymist-sysctl.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/hw/milkymist-sysctl.c b/hw/milkymist-sysctl.c new file mode 100644 index 0000000000..eaea543bf3 --- /dev/null +++ b/hw/milkymist-sysctl.c @@ -0,0 +1,330 @@ +/* + * QEMU model of the Milkymist System Controller. + * + * Copyright (c) 2010 Michael Walle <michael@walle.cc> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + * + * + * Specification available at: + * http://www.milkymist.org/socdoc/sysctl.pdf + */ + +#include "hw.h" +#include "sysbus.h" +#include "sysemu.h" +#include "trace.h" +#include "qemu-timer.h" +#include "qemu-error.h" + +enum { + CTRL_ENABLE = (1<<0), + CTRL_AUTORESTART = (1<<1), +}; + +enum { + ICAP_READY = (1<<0), +}; + +enum { + R_GPIO_IN = 0, + R_GPIO_OUT, + R_GPIO_INTEN, + R_RESERVED0, + R_TIMER0_CONTROL, + R_TIMER0_COMPARE, + R_TIMER0_COUNTER, + R_RESERVED1, + R_TIMER1_CONTROL, + R_TIMER1_COMPARE, + R_TIMER1_COUNTER, + R_RESERVED2, + R_RESERVED3, + R_ICAP, + R_CAPABILITIES, + R_SYSTEM_ID, + R_MAX +}; + +struct MilkymistSysctlState { + SysBusDevice busdev; + + QEMUBH *bh0; + QEMUBH *bh1; + ptimer_state *ptimer0; + ptimer_state *ptimer1; + + uint32_t freq_hz; + uint32_t capabilities; + uint32_t systemid; + uint32_t strappings; + + uint32_t regs[R_MAX]; + + qemu_irq gpio_irq; + qemu_irq timer0_irq; + qemu_irq timer1_irq; +}; +typedef struct MilkymistSysctlState MilkymistSysctlState; + +static void sysctl_icap_write(MilkymistSysctlState *s, uint32_t value) +{ + trace_milkymist_sysctl_icap_write(value); + switch (value & 0xffff) { + case 0x000e: + qemu_system_shutdown_request(); + break; + } +} + +static uint32_t sysctl_read(void *opaque, target_phys_addr_t addr) +{ + MilkymistSysctlState *s = opaque; + uint32_t r = 0; + + addr >>= 2; + switch (addr) { + case R_TIMER0_COUNTER: + r = (uint32_t)ptimer_get_count(s->ptimer0); + /* milkymist timer counts up */ + r = s->regs[R_TIMER0_COMPARE] - r; + break; + case R_TIMER1_COUNTER: + r = (uint32_t)ptimer_get_count(s->ptimer1); + /* milkymist timer counts up */ + r = s->regs[R_TIMER1_COMPARE] - r; + break; + case R_GPIO_IN: + case R_GPIO_OUT: + case R_GPIO_INTEN: + case R_TIMER0_CONTROL: + case R_TIMER0_COMPARE: + case R_TIMER1_CONTROL: + case R_TIMER1_COMPARE: + case R_ICAP: + case R_CAPABILITIES: + case R_SYSTEM_ID: + r = s->regs[addr]; + break; + + default: + error_report("milkymist_sysctl: read access to unkown register 0x" + TARGET_FMT_plx, addr << 2); + break; + } + + trace_milkymist_sysctl_memory_read(addr << 2, r); + + return r; +} + +static void sysctl_write(void *opaque, target_phys_addr_t addr, uint32_t value) +{ + MilkymistSysctlState *s = opaque; + + trace_milkymist_sysctl_memory_write(addr, value); + + addr >>= 2; + switch (addr) { + case R_GPIO_OUT: + case R_GPIO_INTEN: + case R_TIMER0_COUNTER: + if (value > s->regs[R_TIMER0_COUNTER]) { + value = s->regs[R_TIMER0_COUNTER]; + error_report("milkymist_sysctl: timer0: trying to write a " + "value greater than the limit. Clipping."); + } + /* milkymist timer counts up */ + value = s->regs[R_TIMER0_COUNTER] - value; + ptimer_set_count(s->ptimer0, value); + break; + case R_TIMER1_COUNTER: + if (value > s->regs[R_TIMER1_COUNTER]) { + value = s->regs[R_TIMER1_COUNTER]; + error_report("milkymist_sysctl: timer1: trying to write a " + "value greater than the limit. Clipping."); + } + /* milkymist timer counts up */ + value = s->regs[R_TIMER1_COUNTER] - value; + ptimer_set_count(s->ptimer1, value); + break; + case R_TIMER0_COMPARE: + ptimer_set_limit(s->ptimer0, value, 0); + s->regs[addr] = value; + break; + case R_TIMER1_COMPARE: + ptimer_set_limit(s->ptimer1, value, 0); + s->regs[addr] = value; + break; + case R_TIMER0_CONTROL: + s->regs[addr] = value; + if (s->regs[R_TIMER0_CONTROL] & CTRL_ENABLE) { + trace_milkymist_sysctl_start_timer1(); + ptimer_run(s->ptimer0, 0); + } else { + trace_milkymist_sysctl_stop_timer1(); + ptimer_stop(s->ptimer0); + } + break; + case R_TIMER1_CONTROL: + s->regs[addr] = value; + if (s->regs[R_TIMER1_CONTROL] & CTRL_ENABLE) { + trace_milkymist_sysctl_start_timer1(); + ptimer_run(s->ptimer1, 0); + } else { + trace_milkymist_sysctl_stop_timer1(); + ptimer_stop(s->ptimer1); + } + break; + case R_ICAP: + sysctl_icap_write(s, value); + break; + case R_SYSTEM_ID: + qemu_system_reset_request(); + break; + + case R_GPIO_IN: + case R_CAPABILITIES: + error_report("milkymist_sysctl: write to read-only register 0x" + TARGET_FMT_plx, addr << 2); + break; + + default: + error_report("milkymist_sysctl: write access to unkown register 0x" + TARGET_FMT_plx, addr << 2); + break; + } +} + +static CPUReadMemoryFunc * const sysctl_read_fn[] = { + NULL, + NULL, + &sysctl_read, +}; + +static CPUWriteMemoryFunc * const sysctl_write_fn[] = { + NULL, + NULL, + &sysctl_write, +}; + +static void timer0_hit(void *opaque) +{ + MilkymistSysctlState *s = opaque; + + if (!(s->regs[R_TIMER0_CONTROL] & CTRL_AUTORESTART)) { + s->regs[R_TIMER0_CONTROL] &= ~CTRL_ENABLE; + trace_milkymist_sysctl_stop_timer0(); + ptimer_stop(s->ptimer0); + } + + trace_milkymist_sysctl_pulse_irq_timer0(); + qemu_irq_pulse(s->timer0_irq); +} + +static void timer1_hit(void *opaque) +{ + MilkymistSysctlState *s = opaque; + + if (!(s->regs[R_TIMER1_CONTROL] & CTRL_AUTORESTART)) { + s->regs[R_TIMER1_CONTROL] &= ~CTRL_ENABLE; + trace_milkymist_sysctl_stop_timer1(); + ptimer_stop(s->ptimer1); + } + + trace_milkymist_sysctl_pulse_irq_timer1(); + qemu_irq_pulse(s->timer1_irq); +} + +static void milkymist_sysctl_reset(DeviceState *d) +{ + MilkymistSysctlState *s = + container_of(d, MilkymistSysctlState, busdev.qdev); + int i; + + for (i = 0; i < R_MAX; i++) { + s->regs[i] = 0; + } + + ptimer_stop(s->ptimer0); + ptimer_stop(s->ptimer1); + + /* defaults */ + s->regs[R_ICAP] = ICAP_READY; + s->regs[R_SYSTEM_ID] = s->systemid; + s->regs[R_CAPABILITIES] = s->capabilities; + s->regs[R_GPIO_IN] = s->strappings; +} + +static int milkymist_sysctl_init(SysBusDevice *dev) +{ + MilkymistSysctlState *s = FROM_SYSBUS(typeof(*s), dev); + int sysctl_regs; + + sysbus_init_irq(dev, &s->gpio_irq); + sysbus_init_irq(dev, &s->timer0_irq); + sysbus_init_irq(dev, &s->timer1_irq); + + s->bh0 = qemu_bh_new(timer0_hit, s); + s->bh1 = qemu_bh_new(timer1_hit, s); + s->ptimer0 = ptimer_init(s->bh0); + s->ptimer1 = ptimer_init(s->bh1); + ptimer_set_freq(s->ptimer0, s->freq_hz); + ptimer_set_freq(s->ptimer1, s->freq_hz); + + sysctl_regs = cpu_register_io_memory(sysctl_read_fn, sysctl_write_fn, s, + DEVICE_NATIVE_ENDIAN); + sysbus_init_mmio(dev, R_MAX * 4, sysctl_regs); + + return 0; +} + +static const VMStateDescription vmstate_milkymist_sysctl = { + .name = "milkymist-sysctl", + .version_id = 1, + .minimum_version_id = 1, + .minimum_version_id_old = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT32_ARRAY(regs, MilkymistSysctlState, R_MAX), + VMSTATE_PTIMER(ptimer0, MilkymistSysctlState), + VMSTATE_PTIMER(ptimer1, MilkymistSysctlState), + VMSTATE_END_OF_LIST() + } +}; + +static SysBusDeviceInfo milkymist_sysctl_info = { + .init = milkymist_sysctl_init, + .qdev.name = "milkymist-sysctl", + .qdev.size = sizeof(MilkymistSysctlState), + .qdev.vmsd = &vmstate_milkymist_sysctl, + .qdev.reset = milkymist_sysctl_reset, + .qdev.props = (Property[]) { + DEFINE_PROP_UINT32("frequency", MilkymistSysctlState, + freq_hz, 80000000), + DEFINE_PROP_UINT32("capabilities", MilkymistSysctlState, + capabilities, 0x00000000), + DEFINE_PROP_UINT32("systemid", MilkymistSysctlState, + systemid, 0x10014d31), + DEFINE_PROP_UINT32("gpio_strappings", MilkymistSysctlState, + strappings, 0x00000001), + DEFINE_PROP_END_OF_LIST(), + } +}; + +static void milkymist_sysctl_register(void) +{ + sysbus_register_withprop(&milkymist_sysctl_info); +} + +device_init(milkymist_sysctl_register) |