From 7e1543c23b34fa590b636d26b94b7a8e8673569d Mon Sep 17 00:00:00 2001 From: pbrook Date: Sat, 30 Jun 2007 17:32:17 +0000 Subject: [PATCH] ARM PL031 RTC emulation. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3037 c046a42c-6fe2-441c-8c8c-71466251a162 --- Makefile.target | 2 +- hw/integratorcp.c | 1 + hw/pl031.c | 219 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ hw/realview.c | 4 +- hw/versatilepb.c | 3 + vl.h | 3 + 6 files changed, 230 insertions(+), 2 deletions(-) create mode 100644 hw/pl031.c diff --git a/Makefile.target b/Makefile.target index 01d2549..67689cf 100644 --- a/Makefile.target +++ b/Makefile.target @@ -456,7 +456,7 @@ endif endif ifeq ($(TARGET_BASE_ARCH), arm) VL_OBJS+= integratorcp.o versatilepb.o ps2.o smc91c111.o arm_pic.o arm_timer.o -VL_OBJS+= arm_boot.o pl011.o pl050.o pl080.o pl110.o pl181.o pl190.o +VL_OBJS+= arm_boot.o pl011.o pl031.o pl050.o pl080.o pl110.o pl181.o pl190.o VL_OBJS+= versatile_pci.o sd.o ptimer.o VL_OBJS+= arm_gic.o realview.o arm_sysctl.o VL_OBJS+= arm-semi.o diff --git a/hw/integratorcp.c b/hw/integratorcp.c index 119a440..93d980a 100644 --- a/hw/integratorcp.c +++ b/hw/integratorcp.c @@ -490,6 +490,7 @@ static void integratorcp_init(int ram_size, int vga_ram_size, int boot_device, cpu_pic[ARM_PIC_CPU_FIQ]); icp_pic_init(0xca000000, pic[26], NULL); icp_pit_init(0x13000000, pic, 5); + pl031_init(0x15000000, pic[8]); pl011_init(0x16000000, pic[1], serial_hds[0]); pl011_init(0x17000000, pic[2], serial_hds[1]); icp_control_init(0xcb000000); diff --git a/hw/pl031.c b/hw/pl031.c new file mode 100644 index 0000000..7e8098b --- /dev/null +++ b/hw/pl031.c @@ -0,0 +1,219 @@ +/* + * ARM AMBA PrimeCell PL031 RTC + * + * Copyright (c) 2007 CodeSourcery + * + * This file 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. + * + */ + +#include"vl.h" + +//#define DEBUG_PL031 + +#ifdef DEBUG_PL031 +#define DPRINTF(fmt, args...) \ +do { printf("pl031: " fmt , ##args); } while (0) +#else +#define DPRINTF(fmt, args...) do {} while(0) +#endif + +#define RTC_DR 0x00 /* Data read register */ +#define RTC_MR 0x04 /* Match register */ +#define RTC_LR 0x08 /* Data load register */ +#define RTC_CR 0x0c /* Control register */ +#define RTC_IMSC 0x10 /* Interrupt mask and set register */ +#define RTC_RIS 0x14 /* Raw interrupt status register */ +#define RTC_MIS 0x18 /* Masked interrupt status register */ +#define RTC_ICR 0x1c /* Interrupt clear register */ + +typedef struct { + QEMUTimer *timer; + qemu_irq irq; + uint32_t base; + + uint64_t start_time; + uint32_t tick_offset; + + uint32_t mr; + uint32_t lr; + uint32_t cr; + uint32_t im; + uint32_t is; +} pl031_state; + +static const unsigned char pl031_id[] = { + 0x31, 0x10, 0x14, 0x00, /* Device ID */ + 0x0d, 0xf0, 0x05, 0xb1 /* Cell ID */ +}; + +static void pl031_update(pl031_state *s) +{ + qemu_set_irq(s->irq, s->is & s->im); +} + +static void pl031_interrupt(void * opaque) +{ + pl031_state *s = (pl031_state *)opaque; + + s->im = 1; + DPRINTF("Alarm raised\n"); + pl031_update(s); +} + +static uint32_t pl031_get_count(pl031_state *s) +{ + /* This assumes qemu_get_clock returns the time since the machine was + created. */ + return s->tick_offset + qemu_get_clock(vm_clock) / ticks_per_sec; +} + +static void pl031_set_alarm(pl031_state *s) +{ + int64_t now; + uint32_t ticks; + + now = qemu_get_clock(vm_clock); + ticks = s->tick_offset + now / ticks_per_sec; + + /* The timer wraps around. This subtraction also wraps in the same way, + and gives correct results when alarm < now_ticks. */ + ticks = s->mr - ticks; + DPRINTF("Alarm set in %ud ticks\n", ticks); + if (ticks == 0) { + qemu_del_timer(s->timer); + pl031_interrupt(s); + } else { + qemu_mod_timer(s->timer, now + (int64_t)ticks * ticks_per_sec); + } +} + +static uint32_t pl031_read(void *opaque, target_phys_addr_t offset) +{ + pl031_state *s = (pl031_state *)opaque; + + offset -= s->base; + + if (offset >= 0xfe0 && offset < 0x1000) + return pl031_id[(offset - 0xfe0) >> 2]; + + switch (offset) { + case RTC_DR: + return pl031_get_count(s); + case RTC_MR: + return s->mr; + case RTC_IMSC: + return s->im; + case RTC_RIS: + return s->is; + case RTC_LR: + return s->lr; + case RTC_CR: + /* RTC is permanently enabled. */ + return 1; + case RTC_MIS: + return s->is & s->im; + case RTC_ICR: + fprintf(stderr, "qemu: pl031_read: Unexpected offset 0x%x\n", + (int)offset); + break; + default: + cpu_abort(cpu_single_env, "pl031_read: Bad offset 0x%x\n", + (int)offset); + break; + } + + return 0; +} + +static void pl031_write(void * opaque, target_phys_addr_t offset, + uint32_t value) +{ + pl031_state *s = (pl031_state *)opaque; + + offset -= s->base; + + switch (offset) { + case RTC_LR: + s->tick_offset += value - pl031_get_count(s); + pl031_set_alarm(s); + break; + case RTC_MR: + s->mr = value; + pl031_set_alarm(s); + break; + case RTC_IMSC: + s->im = value & 1; + DPRINTF("Interrupt mask %d\n", s->im); + pl031_update(s); + break; + case RTC_ICR: + /* The PL031 documentation (DDI0224B) states that the interupt is + cleared when bit 0 of the written value is set. However the + arm926e documentation (DDI0287B) states that the interrupt is + cleared when any value is written. */ + DPRINTF("Interrupt cleared"); + s->is = 0; + pl031_update(s); + break; + case RTC_CR: + /* Written value is ignored. */ + break; + + case RTC_DR: + case RTC_MIS: + case RTC_RIS: + fprintf(stderr, "qemu: pl031_write: Unexpected offset 0x%x\n", + (int)offset); + break; + + default: + cpu_abort(cpu_single_env, "pl031_write: Bad offset 0x%x\n", + (int)offset); + break; + } +} + +static CPUWriteMemoryFunc * pl031_writefn[] = { + pl031_write, + pl031_write, + pl031_write +}; + +static CPUReadMemoryFunc * pl031_readfn[] = { + pl031_read, + pl031_read, + pl031_read +}; + +void pl031_init(uint32_t base, qemu_irq irq) +{ + int iomemtype; + pl031_state *s; + time_t ti; + struct tm *tm; + + s = qemu_mallocz(sizeof(pl031_state)); + if (!s) + cpu_abort(cpu_single_env, "pl031_init: Out of memory\n"); + + iomemtype = cpu_register_io_memory(0, pl031_readfn, pl031_writefn, s); + if (iomemtype == -1) + cpu_abort(cpu_single_env, "pl031_init: Can't register I/O memory\n"); + + cpu_register_physical_memory(base, 0x00001000, iomemtype); + + s->base = base; + s->irq = irq; + /* ??? We assume vm_clock is zero at this point. */ + time(&ti); + if (rtc_utc) + tm = gmtime(&ti); + else + tm = localtime(&ti); + s->tick_offset = mktime(tm); + + s->timer = qemu_new_timer(vm_clock, pl031_interrupt, s); +} diff --git a/hw/realview.c b/hw/realview.c index 4f48589..1ca02d5 100644 --- a/hw/realview.c +++ b/hw/realview.c @@ -57,6 +57,8 @@ static void realview_init(int ram_size, int vga_ram_size, int boot_device, pl181_init(0x10005000, sd_bdrv, pic[17], pic[18]); + pl031_init(0x10017000, pic[10]); + pci_bus = pci_vpb_init(pic, 48, 1); if (usb_enabled) { usb_ohci_init_pci(pci_bus, 3, -1); @@ -102,7 +104,7 @@ static void realview_init(int ram_size, int vga_ram_size, int boot_device, /* 0x10014000 GPIO 1. */ /* 0x10015000 GPIO 2. */ /* 0x10016000 Reserved. */ - /* 0x10017000 RTC. */ + /* 0x10017000 RTC. */ /* 0x10018000 DMC. */ /* 0x10019000 PCI controller config. */ /* 0x10020000 CLCD. */ diff --git a/hw/versatilepb.c b/hw/versatilepb.c index 1cbd25b..f0142ad 100644 --- a/hw/versatilepb.c +++ b/hw/versatilepb.c @@ -223,6 +223,9 @@ static void versatile_init(int ram_size, int vga_ram_size, int boot_device, pl181_init(0x1000b000, NULL, sic, 23, 2); #endif + /* Add PL031 Real Time Clock. */ + pl031_init(0x101e8000,pic[10]); + /* Memory map for Versatile/PB: */ /* 0x10000000 System registers. */ /* 0x10001000 PCI controller config registers. */ diff --git a/vl.h b/vl.h index 4a072a9..85014cd 100644 --- a/vl.h +++ b/vl.h @@ -1429,6 +1429,9 @@ void ps2_mouse_fake_event(void *opaque); /* smc91c111.c */ void smc91c111_init(NICInfo *, uint32_t, qemu_irq); +/* pl031.c */ +void pl031_init(uint32_t base, qemu_irq irq); + /* pl110.c */ void *pl110_init(DisplayState *ds, uint32_t base, qemu_irq irq, int); -- 2.7.4