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[Qemu-devel] [PATCH V3 1/4] Implement the FreeScale i.MX UART. This uart
From: |
Peter Chubb |
Subject: |
[Qemu-devel] [PATCH V3 1/4] Implement the FreeScale i.MX UART. This uart is used in a variety of SoCs, including some by Motorola, as well as in the FreeScale i.MX series. |
Date: |
Wed, 30 Nov 2011 14:36:29 +1100 |
User-agent: |
quilt/0.48-1 |
Signed-off-by: Hans Jang <address@hidden>
Signed-off-by: Adam Clench <address@hidden>
Signed-off-by: Peter Chubb <address@hidden>
---
Makefile.target | 1
hw/imx_serial.c | 320 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 321 insertions(+)
create mode 100644 hw/imx_serial.c
Index: qemu-working/hw/imx_serial.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ qemu-working/hw/imx_serial.c 2011-11-30 13:38:24.434778115 +1100
@@ -0,0 +1,320 @@
+/*
+ * IMX31 UARTS
+ *
+ * Copyright (c) 2008 OKL
+ * Originally Written by Hans Jiang
+ * Copyright (c) 2011 NICTA Pty Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ * This is a `bare-bones' implementation of the IMX series serial ports.
+ * TODO:
+ * -- implement FIFOs. The real hardware has 32 word transmit
+ * and receive FIFOs; we currently use a 1-char buffer
+ * -- implement DMA
+ * -- implement BAUD-rate and modem lines, for when the backend
+ * is a real serial device.
+ */
+
+#include "hw.h"
+#include "sysbus.h"
+#include "qemu-char.h"
+
+//#define DEBUG_SERIAL 1
+
+#ifdef DEBUG_SERIAL
+#define DPRINTF(fmt, args...) \
+do { printf("imx_serial: " fmt , ##args); } while (0)
+#else
+#define DPRINTF(fmt, args...) do {} while (0)
+#endif
+
+/*
+ * Define to 1 for messages about attempts to
+ * access unimplemented registers or similar.
+ */
+#define DEBUG_IMPLEMENTATION 1
+#if DEBUG_IMPLEMENTATION
+# define IPRINTF(fmt, args...) \
+ do { fprintf(stderr, "imx_serial: " fmt, ##args); } while (0)
+#else
+# define IPRINTF(fmt, args...) do {} while (0)
+#endif
+
+typedef struct {
+ SysBusDevice busdev;
+ MemoryRegion iomem;
+ int32_t readbuff;
+
+ uint32_t usr1;
+ uint32_t usr2;
+ uint32_t ucr1;
+ uint32_t uts1;
+
+ uint32_t ubrm;
+ uint32_t ubrc;
+
+ qemu_irq irq;
+ CharDriverState *chr;
+} imx_state;
+
+static const VMStateDescription vmstate_imx_serial = {
+ .name = "imx-serial",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_INT32(readbuff, imx_state),
+ VMSTATE_UINT32(usr1, imx_state),
+ VMSTATE_UINT32(usr2, imx_state),
+ VMSTATE_UINT32(ucr1, imx_state),
+ VMSTATE_UINT32(uts1, imx_state),
+ VMSTATE_UINT32(ubrm, imx_state),
+ VMSTATE_UINT32(ubrc, imx_state),
+ VMSTATE_END_OF_LIST()
+ },
+};
+
+
+#define URXD_CHARRDY (1<<15) /* character read is valid */
+
+#define USR1_TRDY (1<<13) /* Xmitter ready */
+#define USR1_RRDY (1<<9) /* receiver ready */
+
+#define USR2_TXFE (1<<14) /* Transmit FIFO empty */
+#define USR2_TXDC (1<<3) /* Transmission complete */
+#define USR2_RDR (1<<0) /* Receive data ready */
+
+#define UCR1_TRDYEN (1<<13)
+#define UCR1_RRDYEN (1<<9)
+#define UCR1_TXMPTYEN (1<<6)
+#define UCR1_UARTEN (1<<0)
+
+#define UTS1_TXEMPTY (1<<6)
+#define UTS1_RXEMPTY (1<<5)
+#define UTS1_TXFULL (1<<4)
+#define UTS1_RXFULL (1<<3)
+
+static void imx_update(imx_state *s)
+{
+ uint32_t flags;
+
+ flags = ((s->usr1 & s->ucr1)) & (USR1_TRDY|USR1_RRDY);
+ if (!(s->ucr1 & UCR1_TXMPTYEN)) {
+ flags &= ~USR1_TRDY;
+ }
+
+ if (flags) {
+ DPRINTF("imx_serial: raising interrupt\n");
+ }
+
+ qemu_set_irq(s->irq, !!flags);
+}
+
+static void imx_serial_reset(DeviceState *dev)
+{
+ imx_state *s = container_of(dev, imx_state, busdev.qdev);
+
+ s->usr1 = USR1_TRDY;
+ s->usr2 = USR2_TXFE | USR2_TXDC;
+ s->uts1 = UTS1_RXEMPTY | UTS1_TXEMPTY;
+ s->ubrm = 0;
+ s->ubrc = 0;
+ s->readbuff = 0;
+
+ imx_update(s);
+}
+
+static uint64_t imx_serial_read(void *opaque, target_phys_addr_t offset,
+ unsigned size)
+{
+ imx_state *s = (imx_state *)opaque;
+ uint32_t c;
+
+ DPRINTF("read(offset=%x)\n", offset >> 2);
+ switch (offset >> 2) {
+ case 0x0: /* URXD */
+ c = s->readbuff;
+ if (!(s->uts1 & UTS1_RXEMPTY)) {
+ /* Character is valid */
+ c |= URXD_CHARRDY;
+ s->usr1 &= ~USR1_RRDY;
+ s->usr2 &= ~USR2_RDR;
+ s->uts1 |= UTS1_RXEMPTY;
+ imx_update(s);
+ qemu_chr_accept_input(s->chr);
+ }
+ return c;
+
+ case 0x20: /* UCR1 */
+ return s->ucr1;
+
+ case 0x21: /* UCR2 */
+ return 1; /* reset complete */
+
+ case 0x25: /* USR1 */
+ return s->usr1;
+
+ case 0x26: /* USR2 */
+ return s->usr2;
+
+ case 0x2A: /* BRM Modulator */
+ return s->ubrm;
+
+ case 0x2B: /* Baud Rate Count */
+ return s->ubrc;
+
+ case 0x2d: /* UTS1 */
+ return s->uts1;
+
+ case 0x22: /* UCR3 */
+ case 0x23: /* UCR4 */
+ case 0x24: /* UFCR */
+ case 0x29: /* BRM Incremental */
+ return 0x0; /* TODO */
+
+ default:
+ IPRINTF("imx_serial_read: bad offset: 0x%x\n", (int)offset);
+ return 0;
+ }
+}
+
+static void imx_serial_write(void *opaque, target_phys_addr_t offset,
+ uint64_t value, unsigned size)
+{
+ imx_state *s = (imx_state *)opaque;
+ unsigned char ch;
+
+ DPRINTF("write(offset=%x, value = %x)\n", offset >> 2, (unsigned
int)value);
+ switch (offset >> 2) {
+ case 0x10: /* UTXD */
+ ch = value;
+ if (s->chr) {
+ qemu_chr_fe_write(s->chr, &ch, 1);
+ }
+ s->usr1 &= ~USR1_TRDY;
+ imx_update(s);
+ s->usr1 |= USR1_TRDY;
+ imx_update(s);
+ break;
+
+ case 0x20: /* UCR1 */
+ s->ucr1 = value;
+ DPRINTF("write(ucr1=%x)\n", (unsigned int)value);
+ imx_update(s);
+ break;
+
+ case 0x21: /* UCR2 */
+ if (!(value & 1)) {
+ imx_serial_reset(&s->busdev.qdev);
+ }
+ break;
+
+ case 0x26: /* USR2 */
+ /*
+ * Writing 1 to some bits clears them; all other
+ * values are ignored
+ */
+ value &= (1<<15) | (1<<13) | (1<<12) | (1<<11) | (1<<10)|
+ (1<<8) | (1<<7) | (1<<6) | (1<<4) | (1<<2) | (1<<1);
+ s->usr2 &= ~value;
+ break;
+
+ /* Linux expects to see what it writes here. */
+ /* We don't currently alter the baud rate */
+ case 0x29: /* UBIR */
+ s->ubrc = value;
+ break;
+
+ case 0x2a: /* UBRM */
+ s->ubrm = value;
+ break;
+
+ case 0x2d: /* UTS1 */
+ case 0x22: /* UCR3 */
+ case 0x23: /* UCR4 */
+ case 0x24: /* UFCR */
+ case 0x25: /* USR1 */
+ case 0x2c: /* BIPR1 */
+ /* TODO */
+ break;
+
+ default:
+ IPRINTF("imx_serial_write: Bad offset 0x%x\n", (int)offset);
+ }
+}
+
+static int imx_can_receive(void *opaque)
+{
+ imx_state *s = (imx_state *)opaque;
+ return !(s->usr1 & USR1_RRDY);
+}
+
+static void imx_put_data(void *opaque, uint32_t value)
+{
+ imx_state *s = (imx_state *)opaque;
+
+ s->usr1 |= USR1_RRDY;
+ s->usr2 |= USR2_RDR;
+ s->uts1 &= ~UTS1_RXEMPTY;
+ s->readbuff = value;
+ imx_update(s);
+}
+
+static void imx_receive(void *opaque, const uint8_t *buf, int size)
+{
+ imx_put_data(opaque, *buf);
+}
+
+static void imx_event(void *opaque, int event)
+{
+ if (event == CHR_EVENT_BREAK) {
+ imx_put_data(opaque, 0x400);
+ }
+}
+
+
+static const struct MemoryRegionOps imx_serial_ops = {
+ .read = imx_serial_read,
+ .write = imx_serial_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static int imx_serial_init(SysBusDevice *dev)
+{
+ imx_state *s = FROM_SYSBUS(imx_state, dev);
+
+ memory_region_init_io(&s->iomem, &imx_serial_ops, s, "imx-serial", 0x1000);
+ sysbus_init_mmio_region(dev, &s->iomem);
+ sysbus_init_irq(dev, &s->irq);
+ s->chr = qdev_init_chardev(&dev->qdev);
+ /*
+ * enable the uart on boot, so messages from the linux decompresser
+ * are visible. On real hardware this is done by the boot rom
+ * before anything else is loaded.
+ */
+ s->ucr1 = UCR1_UARTEN;
+
+ if (s->chr) {
+ qemu_chr_add_handlers(s->chr, imx_can_receive, imx_receive,
+ imx_event, s);
+ }
+ return 0;
+}
+
+static SysBusDeviceInfo imx_serial_info = {
+ .qdev.name = "imx_serial",
+ .qdev.desc = "i.MX series UART",
+ .qdev.size = sizeof (imx_state),
+ .qdev.vmsd = &vmstate_imx_serial,
+ .qdev.reset = imx_serial_reset,
+ .init = imx_serial_init,
+};
+
+static void imx_serial_register_devices(void)
+{
+ sysbus_register_withprop(&imx_serial_info);
+}
+
+device_init(imx_serial_register_devices)
Index: qemu-working/Makefile.target
===================================================================
--- qemu-working.orig/Makefile.target 2011-11-30 13:38:19.886754597 +1100
+++ qemu-working/Makefile.target 2011-11-30 13:38:24.434778115 +1100
@@ -361,20 +361,21 @@ obj-arm-y += mst_fpga.o mainstone.o
obj-arm-y += z2.o
obj-arm-y += musicpal.o bitbang_i2c.o marvell_88w8618_audio.o
obj-arm-y += framebuffer.o
obj-arm-y += syborg.o syborg_fb.o syborg_interrupt.o syborg_keyboard.o
obj-arm-y += syborg_serial.o syborg_timer.o syborg_pointer.o syborg_rtc.o
obj-arm-y += syborg_virtio.o
obj-arm-y += vexpress.o
obj-arm-y += strongarm.o
obj-arm-y += collie.o
obj-arm-y += pl041.o lm4549.o
+obj-arm-y += imx_serial.o
obj-sh4-y = shix.o r2d.o sh7750.o sh7750_regnames.o tc58128.o
obj-sh4-y += sh_timer.o sh_serial.o sh_intc.o sh_pci.o sm501.o
obj-sh4-y += ide/mmio.o
obj-m68k-y = an5206.o mcf5206.o mcf_uart.o mcf_intc.o mcf5208.o mcf_fec.o
obj-m68k-y += m68k-semi.o dummy_m68k.o
obj-s390x-y = s390-virtio-bus.o s390-virtio.o
- [Qemu-devel] [PATCH V3 0/4] i.MX31 and KZM board support, Peter Chubb, 2011/11/29
- [Qemu-devel] [PATCH V3 3/4] Implement the FreeSCALE i.MX31 advanced vectored interrupt controller, at least to the extent it is used by Linux 3.0.x, Peter Chubb, 2011/11/29
- [Qemu-devel] [PATCH V3 2/4] Implement the timers on the FreeScale i.MX31 SoC. This is not a complete implementation, but gives enough for Linux to boot and run., Peter Chubb, 2011/11/29
- [Qemu-devel] [PATCH V3 1/4] Implement the FreeScale i.MX UART. This uart is used in a variety of SoCs, including some by Motorola, as well as in the FreeScale i.MX series.,
Peter Chubb <=
- [Qemu-devel] [PATCH V3 4/4] Board support for Kyoto Micros KZM-ARM11-01, an evaluation board built around the FreeScale i.MX31., Peter Chubb, 2011/11/29
- Re: [Qemu-devel] [PATCH V3 0/4] i.MX31 and KZM board support, Stefan Weil, 2011/11/30