From: Guenter Roeck <li...@roeck-us.net> Add support for the Xilinx XADC core used in Zynq 7000.
References: - Zynq-7000 All Programmable SoC Technical Reference Manual - 7 Series FPGAs and Zynq-7000 All Programmable SoC XADC Dual 12-Bit 1 MSPS Analog-to-Digital Converter Tested with Linux using QEMU machine xilinx-zynq-a9 with devicetree files zynq-zc702.dtb and zynq-zc706.dtb, and kernel configuration multi_v7_defconfig. Reviewed-by: Alistair Francis <alistair.fran...@xilinx.com> Signed-off-by: Guenter Roeck <li...@roeck-us.net> [ PC changes: * Changed macro names to match TRM where possible * Made programmers model macro scheme consistent * Dropped XADC_ZYNQ_ prefix on local macros * Fix ALM field width * Update threshold-comparison interrupts in _update_ints() * factored out DFIFO pushes into helper. Renamed to "push/pop" * Changed xadc_reg to 10 bits and added OOB check. * Reduced scope of MCTL reset to just stop channel coms. * Added dummy read data to write commands * Changed _ to - seperators in string names and filenames * Dropped ------------ in header comment * Catchall'ed _update_ints() in _write handler. * Minor whitespace changes. * Use ZYNQ_XADC_FIFO_DEPTH instead of ARRAY_SIZE() ] Signed-off-by: Peter Crosthwaite <crosthwaite.pe...@gmail.com> --- v5: Fix compile warning v4: Addressed Alistair review Minor whitespace changes Use ZYNQ_XADC_FIFO_DEPTH instead of ARRAY_SIZE() v3: See [PC changes] in commit message v2: Use extract32() Merge zynq_xadc_reset() and _zynq_xadc_reset() into one function Use "xlnx,zynq_xadc" Move device model to include/hw/misc/zynq_xadc.h irq -> qemu_irq xadc_dfifo_depth -> xadc_dfifo_entries Dropped unnecessary comments Merged zynq_xadc_realize() into zynq_xadc_init() hw/arm/xilinx_zynq.c | 6 + hw/misc/Makefile.objs | 1 + hw/misc/zynq-xadc.c | 302 ++++++++++++++++++++++++++++++++++++++++++++ include/hw/misc/zynq-xadc.h | 46 +++++++ 4 files changed, 355 insertions(+) create mode 100644 hw/misc/zynq-xadc.c create mode 100644 include/hw/misc/zynq-xadc.h diff --git a/hw/arm/xilinx_zynq.c b/hw/arm/xilinx_zynq.c index 82a9db8..1c1a445 100644 --- a/hw/arm/xilinx_zynq.c +++ b/hw/arm/xilinx_zynq.c @@ -24,6 +24,7 @@ #include "hw/block/flash.h" #include "sysemu/block-backend.h" #include "hw/loader.h" +#include "hw/misc/zynq-xadc.h" #include "hw/ssi.h" #include "qemu/error-report.h" @@ -264,6 +265,11 @@ static void zynq_init(MachineState *machine) sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, 0xE0101000); sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, pic[79-IRQ_OFFSET]); + dev = qdev_create(NULL, TYPE_ZYNQ_XADC); + qdev_init_nofail(dev); + sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, 0xF8007100); + sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, pic[39-IRQ_OFFSET]); + dev = qdev_create(NULL, "pl330"); qdev_prop_set_uint8(dev, "num_chnls", 8); qdev_prop_set_uint8(dev, "num_periph_req", 4); diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs index 4aa76ff..aeb6b7d 100644 --- a/hw/misc/Makefile.objs +++ b/hw/misc/Makefile.objs @@ -36,6 +36,7 @@ obj-$(CONFIG_OMAP) += omap_sdrc.o obj-$(CONFIG_OMAP) += omap_tap.o obj-$(CONFIG_SLAVIO) += slavio_misc.o obj-$(CONFIG_ZYNQ) += zynq_slcr.o +obj-$(CONFIG_ZYNQ) += zynq-xadc.o obj-$(CONFIG_STM32F2XX_SYSCFG) += stm32f2xx_syscfg.o obj-$(CONFIG_PVPANIC) += pvpanic.o diff --git a/hw/misc/zynq-xadc.c b/hw/misc/zynq-xadc.c new file mode 100644 index 0000000..1a32595 --- /dev/null +++ b/hw/misc/zynq-xadc.c @@ -0,0 +1,302 @@ +/* + * ADC registers for Xilinx Zynq Platform + * + * Copyright (c) 2015 Guenter Roeck + * Based on hw/misc/zynq_slcr.c, written by Michal Simek + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "hw/hw.h" +#include "hw/misc/zynq-xadc.h" +#include "qemu/timer.h" +#include "sysemu/sysemu.h" + +enum { + CFG = 0x000 / 4, + INT_STS, + INT_MASK, + MSTS, + CMDFIFO, + RDFIFO, + MCTL, +}; + +#define CFG_ENABLE BIT(31) +#define CFG_CFIFOTH_SHIFT 20 +#define CFG_CFIFOTH_LENGTH 4 +#define CFG_DFIFOTH_SHIFT 16 +#define CFG_DFIFOTH_LENGTH 4 +#define CFG_WEDGE BIT(13) +#define CFG_REDGE BIT(12) +#define CFG_TCKRATE_SHIFT 8 +#define CFG_TCKRATE_LENGTH 2 + +#define CFG_TCKRATE_DIV(x) (0x1 << (x - 1)) + +#define CFG_IGAP_SHIFT 0 +#define CFG_IGAP_LENGTH 5 + +#define INT_CFIFO_LTH BIT(9) +#define INT_DFIFO_GTH BIT(8) +#define INT_OT BIT(7) +#define INT_ALM_SHIFT 0 +#define INT_ALM_LENGTH 7 +#define INT_ALM_MASK (((1 << INT_ALM_LENGTH) - 1) << INT_ALM_SHIFT) + +#define INT_ALL (INT_CFIFO_LTH | INT_DFIFO_GTH | INT_OT | INT_ALM_MASK) + +#define MSTS_CFIFO_LVL_SHIFT 16 +#define MSTS_CFIFO_LVL_LENGTH 4 +#define MSTS_DFIFO_LVL_SHIFT 12 +#define MSTS_DFIFO_LVL_LENGTH 4 +#define MSTS_CFIFOF BIT(11) +#define MSTS_CFIFOE BIT(10) +#define MSTS_DFIFOF BIT(9) +#define MSTS_DFIFOE BIT(8) +#define MSTS_OT BIT(7) +#define MSTS_ALM_SHIFT 0 +#define MSTS_ALM_LENGTH 7 + +#define MCTL_RESET BIT(4) + +#define CMD_NOP 0x00 +#define CMD_READ 0x01 +#define CMD_WRITE 0x02 + +static void zynq_xadc_update_ints(ZynqXADCState *s) +{ + + /* We are fast, commands are actioned instantly so the CFIFO is always + * empty (and below threshold). + */ + s->regs[INT_STS] |= INT_CFIFO_LTH; + + if (s->xadc_dfifo_entries > + extract32(s->regs[CFG], CFG_DFIFOTH_SHIFT, CFG_DFIFOTH_LENGTH)) { + s->regs[INT_STS] |= INT_DFIFO_GTH; + } + + qemu_set_irq(s->qemu_irq, !!(s->regs[INT_STS] & ~s->regs[INT_MASK])); +} + +static void zynq_xadc_reset(DeviceState *d) +{ + ZynqXADCState *s = ZYNQ_XADC(d); + + s->regs[CFG] = 0x14 << CFG_IGAP_SHIFT | + CFG_TCKRATE_DIV(4) << CFG_TCKRATE_SHIFT | CFG_REDGE; + s->regs[INT_STS] = INT_CFIFO_LTH; + s->regs[INT_MASK] = 0xffffffff; + s->regs[CMDFIFO] = 0; + s->regs[RDFIFO] = 0; + s->regs[MCTL] = MCTL_RESET; + + memset(s->xadc_regs, 0, sizeof(s->xadc_regs)); + memset(s->xadc_dfifo, 0, sizeof(s->xadc_dfifo)); + s->xadc_dfifo_entries = 0; + + zynq_xadc_update_ints(s); +} + +static uint16_t xadc_pop_dfifo(ZynqXADCState *s) +{ + uint16_t rv = s->xadc_dfifo[0]; + int i; + + if (s->xadc_dfifo_entries > 0) { + s->xadc_dfifo_entries--; + } + for (i = 0; i < s->xadc_dfifo_entries; i++) { + s->xadc_dfifo[i] = s->xadc_dfifo[i + 1]; + } + s->xadc_dfifo[s->xadc_dfifo_entries] = 0; + zynq_xadc_update_ints(s); + return rv; +} + +static void xadc_push_dfifo(ZynqXADCState *s, uint16_t regval) +{ + if (s->xadc_dfifo_entries < ZYNQ_XADC_FIFO_DEPTH) { + s->xadc_dfifo[s->xadc_dfifo_entries++] = s->xadc_read_reg_previous; + } + s->xadc_read_reg_previous = regval; + zynq_xadc_update_ints(s); +} + +static bool zynq_xadc_check_offset(hwaddr offset, bool rnw) +{ + switch (offset) { + case CFG: + case INT_MASK: + case INT_STS: + case MCTL: + return true; + case RDFIFO: + case MSTS: + return rnw; /* read only */ + case CMDFIFO: + return !rnw; /* write only */ + default: + return false; + } +} + +static uint64_t zynq_xadc_read(void *opaque, hwaddr offset, unsigned size) +{ + ZynqXADCState *s = opaque; + int reg = offset / 4; + uint32_t rv = 0; + + if (!zynq_xadc_check_offset(reg, true)) { + qemu_log_mask(LOG_GUEST_ERROR, "zynq_xadc: Invalid read access to " + "addr %" HWADDR_PRIx "\n", offset); + return 0; + } + + switch (reg) { + case CFG: + case INT_MASK: + case INT_STS: + case MCTL: + rv = s->regs[reg]; + break; + case MSTS: + rv = MSTS_CFIFOE; + rv |= s->xadc_dfifo_entries << MSTS_DFIFO_LVL_SHIFT; + if (!s->xadc_dfifo_entries) { + rv |= MSTS_DFIFOE; + } else if (s->xadc_dfifo_entries == ZYNQ_XADC_FIFO_DEPTH) { + rv |= MSTS_DFIFOF; + } + break; + case RDFIFO: + rv = xadc_pop_dfifo(s); + break; + } + return rv; +} + +static void zynq_xadc_write(void *opaque, hwaddr offset, uint64_t val, + unsigned size) +{ + ZynqXADCState *s = (ZynqXADCState *)opaque; + int reg = offset / 4; + int xadc_reg; + int xadc_cmd; + int xadc_data; + + if (!zynq_xadc_check_offset(reg, false)) { + qemu_log_mask(LOG_GUEST_ERROR, "zynq_xadc: Invalid write access " + "to addr %" HWADDR_PRIx "\n", offset); + return; + } + + switch (reg) { + case CFG: + s->regs[CFG] = val; + break; + case INT_STS: + s->regs[INT_STS] &= ~val; + break; + case INT_MASK: + s->regs[INT_MASK] = val & INT_ALL; + break; + case CMDFIFO: + xadc_cmd = extract32(val, 26, 4); + xadc_reg = extract32(val, 16, 10); + xadc_data = extract32(val, 0, 16); + + if (s->regs[MCTL] & MCTL_RESET) { + qemu_log_mask(LOG_GUEST_ERROR, "zynq_xadc: Sending command " + "while comm channel held in reset: %" PRIx32 "\n", + (uint32_t) val); + break; + } + + if (xadc_reg > ZYNQ_XADC_NUM_ADC_REGS && xadc_cmd != CMD_NOP) { + qemu_log_mask(LOG_GUEST_ERROR, "read/write op to invalid xadc " + "reg 0x%x\n", xadc_reg); + break; + } + + switch (xadc_cmd) { + case CMD_READ: + xadc_push_dfifo(s, s->xadc_regs[xadc_reg]); + break; + case CMD_WRITE: + s->xadc_regs[xadc_reg] = xadc_data; + /* fallthrough */ + case CMD_NOP: + xadc_push_dfifo(s, 0); + break; + } + break; + case MCTL: + s->regs[MCTL] = val & 0x00fffeff; + break; + } + zynq_xadc_update_ints(s); +} + +static const MemoryRegionOps xadc_ops = { + .read = zynq_xadc_read, + .write = zynq_xadc_write, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static void zynq_xadc_init(Object *obj) +{ + SysBusDevice *sbd = SYS_BUS_DEVICE(obj); + ZynqXADCState *s = ZYNQ_XADC(obj); + + memory_region_init_io(&s->iomem, obj, &xadc_ops, s, "zynq-xadc", + ZYNQ_XADC_MMIO_SIZE); + sysbus_init_mmio(sbd, &s->iomem); + sysbus_init_irq(sbd, &s->qemu_irq); +} + +static const VMStateDescription vmstate_zynq_xadc = { + .name = "zynq-xadc", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT32_ARRAY(regs, ZynqXADCState, ZYNQ_XADC_NUM_IO_REGS), + VMSTATE_UINT16_ARRAY(xadc_regs, ZynqXADCState, + ZYNQ_XADC_NUM_ADC_REGS), + VMSTATE_UINT16_ARRAY(xadc_dfifo, ZynqXADCState, + ZYNQ_XADC_FIFO_DEPTH), + VMSTATE_UINT16(xadc_read_reg_previous, ZynqXADCState), + VMSTATE_UINT16(xadc_dfifo_entries, ZynqXADCState), + VMSTATE_END_OF_LIST() + } +}; + +static void zynq_xadc_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->vmsd = &vmstate_zynq_xadc; + dc->reset = zynq_xadc_reset; +} + +static const TypeInfo zynq_xadc_info = { + .class_init = zynq_xadc_class_init, + .name = TYPE_ZYNQ_XADC, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(ZynqXADCState), + .instance_init = zynq_xadc_init, +}; + +static void zynq_xadc_register_types(void) +{ + type_register_static(&zynq_xadc_info); +} + +type_init(zynq_xadc_register_types) diff --git a/include/hw/misc/zynq-xadc.h b/include/hw/misc/zynq-xadc.h new file mode 100644 index 0000000..f1a410a --- /dev/null +++ b/include/hw/misc/zynq-xadc.h @@ -0,0 +1,46 @@ +/* + * Device model for Zynq ADC controller + * + * Copyright (c) 2015 Guenter Roeck <li...@roeck-us.net> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef ZYNQ_XADC_H +#define ZYNQ_XADC_H + +#include "hw/sysbus.h" + +#define ZYNQ_XADC_MMIO_SIZE 0x0020 +#define ZYNQ_XADC_NUM_IO_REGS (ZYNQ_XADC_MMIO_SIZE / 4) +#define ZYNQ_XADC_NUM_ADC_REGS 128 +#define ZYNQ_XADC_FIFO_DEPTH 15 + +#define TYPE_ZYNQ_XADC "xlnx,zynq-xadc" +#define ZYNQ_XADC(obj) \ + OBJECT_CHECK(ZynqXADCState, (obj), TYPE_ZYNQ_XADC) + +typedef struct ZynqXADCState { + /*< private >*/ + SysBusDevice parent_obj; + + /*< public >*/ + MemoryRegion iomem; + + uint32_t regs[ZYNQ_XADC_NUM_IO_REGS]; + uint16_t xadc_regs[ZYNQ_XADC_NUM_ADC_REGS]; + uint16_t xadc_read_reg_previous; + uint16_t xadc_dfifo[ZYNQ_XADC_FIFO_DEPTH]; + uint16_t xadc_dfifo_entries; + + struct IRQState *qemu_irq; + +} ZynqXADCState; + +#endif /* ZYNQ_XADC_H */ -- 1.9.1