hw/misc: Add support for ADC controller in Xilinx Zynq 7000

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.francis@xilinx.com>
Signed-off-by: Guenter Roeck <linux@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.peter@gmail.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 46 insertions, 0 deletions

diff --git a/include/hw/misc/zynq-xadc.h b/include/hw/misc/zynq-xadc.h
new file mode 100644
index 0000000000..f1a410a376
--- /dev/null
+++ b/include/hw/misc/zynq-xadc.h
@@ -0,0 +1,46 @@
+/*
+ * Device model for Zynq ADC controller
+ *
+ * Copyright (c) 2015 Guenter Roeck <linux@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 */