/* * QEMU model of the Xilinx Zynq SPI controller * * Copyright (c) 2012 Peter A. G. Crosthwaite * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "sysbus.h" #include "sysemu.h" #include "ptimer.h" #include "qemu-log.h" #include "fifo.h" #include "ssi.h" #ifdef XILINX_SPIPS_ERR_DEBUG #define DB_PRINT(...) do { \ fprintf(stderr, ": %s: ", __func__); \ fprintf(stderr, ## __VA_ARGS__); \ } while (0); #else #define DB_PRINT(...) #endif /* config register */ #define R_CONFIG (0x00 / 4) #define MODEFAIL_GEN_EN (1 << 17) #define MAN_START_COM (1 << 16) #define MAN_START_EN (1 << 15) #define MANUAL_CS (1 << 14) #define CS (0xF << 10) #define CS_SHIFT (10) #define PERI_SEL (1 << 9) #define REF_CLK (1 << 8) #define FIFO_WIDTH (3 << 6) #define BAUD_RATE_DIV (7 << 3) #define CLK_PH (1 << 2) #define CLK_POL (1 << 1) #define MODE_SEL (1 << 0) /* interrupt mechanism */ #define R_INTR_STATUS (0x04 / 4) #define R_INTR_EN (0x08 / 4) #define R_INTR_DIS (0x0C / 4) #define R_INTR_MASK (0x10 / 4) #define IXR_TX_FIFO_UNDERFLOW (1 << 6) #define IXR_RX_FIFO_FULL (1 << 5) #define IXR_RX_FIFO_NOT_EMPTY (1 << 4) #define IXR_TX_FIFO_FULL (1 << 3) #define IXR_TX_FIFO_NOT_FULL (1 << 2) #define IXR_TX_FIFO_MODE_FAIL (1 << 1) #define IXR_RX_FIFO_OVERFLOW (1 << 0) #define IXR_ALL ((IXR_TX_FIFO_UNDERFLOW<<1)-1) #define R_EN (0x14 / 4) #define R_DELAY (0x18 / 4) #define R_TX_DATA (0x1C / 4) #define R_RX_DATA (0x20 / 4) #define R_SLAVE_IDLE_COUNT (0x24 / 4) #define R_TX_THRES (0x28 / 4) #define R_RX_THRES (0x2C / 4) #define R_MOD_ID (0xFC / 4) #define R_MAX (R_MOD_ID+1) /* size of TXRX FIFOs */ #define NUM_CS_LINES 4 #define RXFF_A 32 #define TXFF_A 32 typedef struct { SysBusDevice busdev; MemoryRegion iomem; qemu_irq irq; int irqline; qemu_irq cs_lines[NUM_CS_LINES]; SSIBus *spi; Fifo8 rx_fifo; Fifo8 tx_fifo; uint32_t regs[R_MAX]; } XilinxSPIPS; static void xilinx_spips_update_cs_lines(XilinxSPIPS *s) { int i; bool found = false; int field = s->regs[R_CONFIG] >> CS_SHIFT; for (i = 0; i < NUM_CS_LINES; i++) { if (~field & (1 << i) && !found) { found = true; DB_PRINT("selecting slave %d\n", i); qemu_set_irq(s->cs_lines[i], 0); } else { qemu_set_irq(s->cs_lines[i], 1); } } } static void xilinx_spips_update_ixr(XilinxSPIPS *s) { /* These are set/cleared as they occur */ s->regs[R_INTR_STATUS] &= (IXR_TX_FIFO_UNDERFLOW | IXR_RX_FIFO_OVERFLOW | IXR_TX_FIFO_MODE_FAIL); /* these are pure functions of fifo state, set them here */ s->regs[R_INTR_STATUS] |= (fifo8_is_full(&s->rx_fifo) ? IXR_RX_FIFO_FULL : 0) | (s->rx_fifo.num >= s->regs[R_RX_THRES] ? IXR_RX_FIFO_NOT_EMPTY : 0) | (fifo8_is_full(&s->tx_fifo) ? IXR_TX_FIFO_FULL : 0) | (s->tx_fifo.num < s->regs[R_TX_THRES] ? IXR_TX_FIFO_NOT_FULL : 0); /* drive external interrupt pin */ int new_irqline = !!(s->regs[R_INTR_MASK] & s->regs[R_INTR_STATUS] & IXR_ALL); if (new_irqline != s->irqline) { s->irqline = new_irqline; qemu_set_irq(s->irq, s->irqline); } } static void xilinx_spips_reset(DeviceState *d) { XilinxSPIPS *s = DO_UPCAST(XilinxSPIPS, busdev.qdev, d); int i; for (i = 0; i < R_MAX; i++) { s->regs[i] = 0; } fifo8_reset(&s->rx_fifo); fifo8_reset(&s->rx_fifo); /* non zero resets */ s->regs[R_CONFIG] |= MODEFAIL_GEN_EN; s->regs[R_SLAVE_IDLE_COUNT] = 0xFF; s->regs[R_TX_THRES] = 1; s->regs[R_RX_THRES] = 1; /* FIXME: move magic number definition somewhere sensible */ s->regs[R_MOD_ID] = 0x01090106; xilinx_spips_update_ixr(s); xilinx_spips_update_cs_lines(s); } static void xilinx_spips_flush_txfifo(XilinxSPIPS *s) { for (;;) { uint32_t r; uint8_t value; if (fifo8_is_empty(&s->tx_fifo)) { s->regs[R_INTR_STATUS] |= IXR_TX_FIFO_UNDERFLOW; break; } else { value = fifo8_pop(&s->tx_fifo); } r = ssi_transfer(s->spi, (uint32_t)value); DB_PRINT("tx = %02x rx = %02x\n", value, r); if (fifo8_is_full(&s->rx_fifo)) { s->regs[R_INTR_STATUS] |= IXR_RX_FIFO_OVERFLOW; DB_PRINT("rx FIFO overflow"); } else { fifo8_push(&s->rx_fifo, (uint8_t)r); } } xilinx_spips_update_ixr(s); } static uint64_t xilinx_spips_read(void *opaque, target_phys_addr_t addr, unsigned size) { XilinxSPIPS *s = opaque; uint32_t mask = ~0; uint32_t ret; addr >>= 2; switch (addr) { case R_CONFIG: mask = 0x0002FFFF; break; case R_INTR_STATUS: case R_INTR_MASK: mask = IXR_ALL; break; case R_EN: mask = 0x1; break; case R_SLAVE_IDLE_COUNT: mask = 0xFF; break; case R_MOD_ID: mask = 0x01FFFFFF; break; case R_INTR_EN: case R_INTR_DIS: case R_TX_DATA: mask = 0; break; case R_RX_DATA: ret = (uint32_t)fifo8_pop(&s->rx_fifo); DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", addr * 4, ret); xilinx_spips_update_ixr(s); return ret; } DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", addr * 4, s->regs[addr] & mask); return s->regs[addr] & mask; } static void xilinx_spips_write(void *opaque, target_phys_addr_t addr, uint64_t value, unsigned size) { int mask = ~0; int man_start_com = 0; XilinxSPIPS *s = opaque; DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", addr, (unsigned)value); addr >>= 2; switch (addr) { case R_CONFIG: mask = 0x0002FFFF; if (value & MAN_START_COM) { man_start_com = 1; } break; case R_INTR_STATUS: mask = IXR_ALL; s->regs[R_INTR_STATUS] &= ~(mask & value); goto no_reg_update; case R_INTR_DIS: mask = IXR_ALL; s->regs[R_INTR_MASK] &= ~(mask & value); goto no_reg_update; case R_INTR_EN: mask = IXR_ALL; s->regs[R_INTR_MASK] |= mask & value; goto no_reg_update; case R_EN: mask = 0x1; break; case R_SLAVE_IDLE_COUNT: mask = 0xFF; break; case R_RX_DATA: case R_INTR_MASK: case R_MOD_ID: mask = 0; break; case R_TX_DATA: fifo8_push(&s->tx_fifo, (uint8_t)value); goto no_reg_update; } s->regs[addr] = (s->regs[addr] & ~mask) | (value & mask); no_reg_update: if (man_start_com) { xilinx_spips_flush_txfifo(s); } xilinx_spips_update_ixr(s); xilinx_spips_update_cs_lines(s); } static const MemoryRegionOps spips_ops = { .read = xilinx_spips_read, .write = xilinx_spips_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static int xilinx_spips_init(SysBusDevice *dev) { XilinxSPIPS *s = FROM_SYSBUS(typeof(*s), dev); int i; DB_PRINT("inited device model\n"); s->spi = ssi_create_bus(&dev->qdev, "spi"); ssi_auto_connect_slaves(DEVICE(s), s->cs_lines, s->spi); sysbus_init_irq(dev, &s->irq); for (i = 0; i < NUM_CS_LINES; ++i) { sysbus_init_irq(dev, &s->cs_lines[i]); } memory_region_init_io(&s->iomem, &spips_ops, s, "spi", R_MAX*4); sysbus_init_mmio(dev, &s->iomem); s->irqline = -1; fifo8_create(&s->rx_fifo, RXFF_A); fifo8_create(&s->tx_fifo, TXFF_A); return 0; } static int xilinx_spips_post_load(void *opaque, int version_id) { xilinx_spips_update_ixr((XilinxSPIPS *)opaque); xilinx_spips_update_cs_lines((XilinxSPIPS *)opaque); return 0; } static const VMStateDescription vmstate_xilinx_spips = { .name = "xilinx_spips", .version_id = 1, .minimum_version_id = 1, .minimum_version_id_old = 1, .post_load = xilinx_spips_post_load, .fields = (VMStateField[]) { VMSTATE_FIFO8(tx_fifo, XilinxSPIPS), VMSTATE_FIFO8(rx_fifo, XilinxSPIPS), VMSTATE_UINT32_ARRAY(regs, XilinxSPIPS, R_MAX), VMSTATE_END_OF_LIST() } }; static void xilinx_spips_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass); sdc->init = xilinx_spips_init; dc->reset = xilinx_spips_reset; dc->vmsd = &vmstate_xilinx_spips; } static const TypeInfo xilinx_spips_info = { .name = "xilinx,spips", .parent = TYPE_SYS_BUS_DEVICE, .instance_size = sizeof(XilinxSPIPS), .class_init = xilinx_spips_class_init, }; static void xilinx_spips_register_types(void) { type_register_static(&xilinx_spips_info); } type_init(xilinx_spips_register_types)