| Message ID | 1499057115-6773-4-git-send-email-sundeep.lkml@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Sun, Jul 2, 2017 at 9:45 PM, Subbaraya Sundeep <sundeep.lkml@gmail.com> wrote: > Modelled Microsemi's Smartfusion2 SPI controller. > > Signed-off-by: Subbaraya Sundeep <sundeep.lkml@gmail.com> > --- > hw/ssi/Makefile.objs | 1 + > hw/ssi/mss-spi.c | 414 +++++++++++++++++++++++++++++++++++++++++++++++ > include/hw/ssi/mss-spi.h | 62 +++++++ > 3 files changed, 477 insertions(+) > create mode 100644 hw/ssi/mss-spi.c > create mode 100644 include/hw/ssi/mss-spi.h > > diff --git a/hw/ssi/Makefile.objs b/hw/ssi/Makefile.objs > index 487add2..f5bcc65 100644 > --- a/hw/ssi/Makefile.objs > +++ b/hw/ssi/Makefile.objs > @@ -4,6 +4,7 @@ common-obj-$(CONFIG_XILINX_SPI) += xilinx_spi.o > common-obj-$(CONFIG_XILINX_SPIPS) += xilinx_spips.o > common-obj-$(CONFIG_ASPEED_SOC) += aspeed_smc.o > common-obj-$(CONFIG_STM32F2XX_SPI) += stm32f2xx_spi.o > +common-obj-$(CONFIG_MSF2) += mss-spi.o > > obj-$(CONFIG_OMAP) += omap_spi.o > obj-$(CONFIG_IMX) += imx_spi.o > diff --git a/hw/ssi/mss-spi.c b/hw/ssi/mss-spi.c > new file mode 100644 > index 0000000..a572abc > --- /dev/null > +++ b/hw/ssi/mss-spi.c > @@ -0,0 +1,414 @@ > +/* > + * Block model of SPI controller present in > + * Microsemi's SmartFusion2 and SmartFusion SoCs. > + * > + * Copyright (C) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com> > + * > + * 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 "hw/ssi/mss-spi.h" Same comment as earlier patches. > + > +#ifndef MSS_SPI_ERR_DEBUG > +#define MSS_SPI_ERR_DEBUG 0 > +#endif > + > +#define DB_PRINT_L(lvl, fmt, args...) do { \ > + if (MSS_SPI_ERR_DEBUG >= lvl) { \ > + qemu_log("%s: " fmt "\n", __func__, ## args); \ > + } \ > +} while (0); > + > +#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args) > + > +#define FIFO_CAPACITY 32 > +#define FIFO_CAPACITY 32 > + > +#define R_SPI_CONTROL 0 > +#define R_SPI_DFSIZE 1 > +#define R_SPI_STATUS 2 > +#define R_SPI_INTCLR 3 > +#define R_SPI_RX 4 > +#define R_SPI_TX 5 > +#define R_SPI_CLKGEN 6 > +#define R_SPI_SS 7 > +#define R_SPI_MIS 8 > +#define R_SPI_RIS 9 > + > +#define S_TXDONE (1 << 0) > +#define S_RXRDY (1 << 1) > +#define S_RXCHOVRF (1 << 2) > +#define S_RXFIFOFUL (1 << 4) > +#define S_RXFIFOFULNXT (1 << 5) > +#define S_RXFIFOEMP (1 << 6) > +#define S_RXFIFOEMPNXT (1 << 7) > +#define S_TXFIFOFUL (1 << 8) > +#define S_TXFIFOFULNXT (1 << 9) > +#define S_TXFIFOEMP (1 << 10) > +#define S_TXFIFOEMPNXT (1 << 11) > +#define S_FRAMESTART (1 << 12) > +#define S_SSEL (1 << 13) > +#define S_ACTIVE (1 << 14) > + > +#define C_ENABLE (1 << 0) > +#define C_MODE (1 << 1) > +#define C_INTRXDATA (1 << 4) > +#define C_INTTXDATA (1 << 5) > +#define C_INTRXOVRFLO (1 << 6) > +#define C_SPS (1 << 26) > +#define C_BIGFIFO (1 << 29) > +#define C_RESET (1 << 31) > + > +#define FRAMESZ_MASK 0x1F > +#define FMCOUNT_MASK 0x00FFFF00 > +#define FMCOUNT_SHIFT 8 > + > +static void txfifo_reset(MSSSpiState *s) > +{ > + fifo32_reset(&s->tx_fifo); > + > + s->regs[R_SPI_STATUS] &= ~S_TXFIFOFUL; > + s->regs[R_SPI_STATUS] |= S_TXFIFOEMP; > +} > + > +static void rxfifo_reset(MSSSpiState *s) > +{ > + fifo32_reset(&s->rx_fifo); > + > + s->regs[R_SPI_STATUS] &= ~S_RXFIFOFUL; > + s->regs[R_SPI_STATUS] |= S_RXFIFOEMP; > +} > + > +static void set_fifodepth(MSSSpiState *s) > +{ > + unsigned int size = s->regs[R_SPI_DFSIZE] & FRAMESZ_MASK; > + > + if (size <= 8) { > + s->fifo_depth = 32; > + } else if (size <= 16) { > + s->fifo_depth = 16; > + } else if (size <= 32) { > + s->fifo_depth = 8; > + } else { > + s->fifo_depth = 4; > + } > +} > + > +static void mss_spi_do_reset(MSSSpiState *s) > +{ > + memset(s->regs, 0, sizeof s->regs); > + s->regs[R_SPI_CONTROL] = 0x80000102; > + s->regs[R_SPI_DFSIZE] = 0x4; > + s->regs[R_SPI_STATUS] = S_SSEL | S_TXFIFOEMP | S_RXFIFOEMP; > + s->regs[R_SPI_CLKGEN] = 0x7; > + s->regs[R_SPI_RIS] = 0x0; > + > + s->fifo_depth = 4; > + s->frame_count = 1; > + s->enabled = false; > + > + rxfifo_reset(s); > + txfifo_reset(s); > +} > + > +static void update_mis(MSSSpiState *s) > +{ > + uint32_t reg = s->regs[R_SPI_CONTROL]; > + uint32_t tmp; > + > + /* > + * form the Control register interrupt enable bits > + * same as RIS, MIS and Interrupt clear registers for simplicity > + */ > + tmp = ((reg & C_INTRXOVRFLO) >> 4) | ((reg & C_INTRXDATA) >> 3) | > + ((reg & C_INTTXDATA) >> 5); > + s->regs[R_SPI_MIS] |= tmp & s->regs[R_SPI_RIS]; > +} > + > +static void spi_update_irq(MSSSpiState *s) > +{ > + int irq; > + > + update_mis(s); > + irq = !!(s->regs[R_SPI_MIS]); > + > + qemu_set_irq(s->irq, irq); > +} > + > +static void mss_spi_reset(DeviceState *d) > +{ > + mss_spi_do_reset(MSS_SPI(d)); > +} > + > +static uint64_t > +spi_read(void *opaque, hwaddr addr, unsigned int size) > +{ > + MSSSpiState *s = opaque; > + uint32_t ret = 0; > + > + addr >>= 2; > + switch (addr) { > + case R_SPI_RX: > + s->regs[R_SPI_STATUS] &= ~S_RXFIFOFUL; > + s->regs[R_SPI_STATUS] &= ~S_RXCHOVRF; > + ret = fifo32_pop(&s->rx_fifo); > + if (fifo32_is_empty(&s->rx_fifo)) { > + s->regs[R_SPI_STATUS] |= S_RXFIFOEMP; > + } > + break; > + > + case R_SPI_MIS: > + update_mis(s); > + ret = s->regs[R_SPI_MIS]; > + break; > + > + default: > + if (addr < ARRAY_SIZE(s->regs)) { > + ret = s->regs[addr]; > + } else { > + qemu_log_mask(LOG_GUEST_ERROR, > + "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, > + addr * 4); I think return here to avoid the next print statement and irq update. > + } > + break; > + } > + > + DB_PRINT("addr=0x%" HWADDR_PRIx " = 0x%" PRIx32, addr * 4, ret); > + spi_update_irq(s); > + return ret; > +} > + > +static void assert_cs(MSSSpiState *s) > +{ > + qemu_set_irq(s->cs_line, 0); > +} > + > +static void deassert_cs(MSSSpiState *s) > +{ > + qemu_set_irq(s->cs_line, 1); > +} > + > +static void spi_flush_txfifo(MSSSpiState *s) > +{ > + uint32_t tx; > + uint32_t rx; > + bool sps = !!(s->regs[R_SPI_CONTROL] & C_SPS); > + > + /* > + * Chip Select(CS) is automatically controlled by this controller. > + * If SPS bit is set in Control register then CS is asserted > + * until all the frames set in frame count of Control register are > + * transferred. If SPS is not set then CS pulses between frames. > + * Note that Slave Select register specifies which of the CS line > + * has to be controlled automatically by controller. Bits SS[7:1] are for > + * masters in FPGA fabric since we model only Microcontroller subsystem > + * of Smartfusion2 we control only one CS(SS[0]) line. > + */ > + while (!fifo32_is_empty(&s->tx_fifo) && s->frame_count) { > + assert_cs(s); > + > + s->regs[R_SPI_STATUS] &= ~(S_TXDONE | S_RXRDY); > + > + tx = fifo32_pop(&s->tx_fifo); > + DB_PRINT("data tx:0x%" PRIx32, tx); > + rx = ssi_transfer(s->spi, tx); > + DB_PRINT("data rx:0x%" PRIx32, rx); > + > + if (fifo32_num_used(&s->rx_fifo) == s->fifo_depth) { > + s->regs[R_SPI_STATUS] |= S_RXCHOVRF; > + s->regs[R_SPI_RIS] |= S_RXCHOVRF; > + } else { > + fifo32_push(&s->rx_fifo, rx); > + s->regs[R_SPI_STATUS] &= ~S_RXFIFOEMP; > + if (fifo32_num_used(&s->rx_fifo) == (s->fifo_depth - 1)) { > + s->regs[R_SPI_STATUS] |= S_RXFIFOFULNXT; > + } > + if (fifo32_num_used(&s->rx_fifo) == s->fifo_depth) { I'd use an else if to indicate that both can't happen at the same time. > + s->regs[R_SPI_STATUS] |= S_RXFIFOFUL; > + } > + } > + s->frame_count--; > + if (!sps) { > + deassert_cs(s); > + assert_cs(s); Do you need the asert here? Can't you just wait for it to hit the start of the loop? Does it deassert assert and deassert after a transfer has finished? > + } > + } > + > + if (!sps) { > + deassert_cs(s); > + } > + > + if (!s->frame_count) { > + s->frame_count = (s->regs[R_SPI_CONTROL] & FMCOUNT_MASK) >> > + FMCOUNT_SHIFT; > + if (sps) { > + deassert_cs(s); > + } > + s->regs[R_SPI_RIS] |= S_TXDONE | S_RXRDY; > + s->regs[R_SPI_STATUS] |= S_TXDONE | S_RXRDY; > + } > +} > + > +static void spi_write(void *opaque, hwaddr addr, > + uint64_t val64, unsigned int size) > +{ > + MSSSpiState *s = opaque; > + uint32_t value = val64; > + > + DB_PRINT("addr=0x%" HWADDR_PRIx " =0x%" PRIx32, addr, value); > + addr >>= 2; > + > + switch (addr) { > + case R_SPI_TX: > + /* adding to already full FIFO */ > + if (fifo32_num_used(&s->tx_fifo) == s->fifo_depth) { > + break; > + } > + s->regs[R_SPI_STATUS] &= ~S_TXFIFOEMP; > + fifo32_push(&s->tx_fifo, value); > + if (fifo32_num_used(&s->tx_fifo) == (s->fifo_depth - 1)) { > + s->regs[R_SPI_STATUS] |= S_TXFIFOFULNXT; > + } else if here as well Thanks, Alistair > + if (fifo32_num_used(&s->tx_fifo) == s->fifo_depth) { > + s->regs[R_SPI_STATUS] |= S_TXFIFOFUL; > + } > + if (s->enabled) { > + spi_flush_txfifo(s); > + } > + break; > + > + case R_SPI_CONTROL: > + s->regs[R_SPI_CONTROL] = value; > + if (value & C_BIGFIFO) { > + set_fifodepth(s); > + } else { > + s->fifo_depth = 4; > + } > + s->enabled = value & C_ENABLE; > + s->frame_count = (value & FMCOUNT_MASK) >> FMCOUNT_SHIFT; > + if (value & C_RESET) { > + mss_spi_do_reset(s); > + } > + break; > + > + case R_SPI_DFSIZE: > + if (s->enabled) { > + break; > + } > + s->regs[R_SPI_DFSIZE] = value; > + break; > + > + case R_SPI_INTCLR: > + s->regs[R_SPI_INTCLR] = value; > + if (value & S_TXDONE) { > + s->regs[R_SPI_RIS] &= ~S_TXDONE; > + } > + if (value & S_RXRDY) { > + s->regs[R_SPI_RIS] &= ~S_RXRDY; > + } > + if (value & S_RXCHOVRF) { > + s->regs[R_SPI_RIS] &= ~S_RXCHOVRF; > + } > + break; > + > + case R_SPI_MIS: > + case R_SPI_STATUS: > + case R_SPI_RIS: > + qemu_log_mask(LOG_GUEST_ERROR, > + "%s: Write to read only register 0x%" HWADDR_PRIx "\n", > + __func__, addr * 4); > + break; > + > + default: > + if (addr < ARRAY_SIZE(s->regs)) { > + s->regs[addr] = value; > + } else { > + qemu_log_mask(LOG_GUEST_ERROR, > + "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, > + addr * 4); > + } > + break; > + } > + > + spi_update_irq(s); > +} > + > +static const MemoryRegionOps spi_ops = { > + .read = spi_read, > + .write = spi_write, > + .endianness = DEVICE_NATIVE_ENDIAN, > + .valid = { > + .min_access_size = 1, > + .max_access_size = 4 > + } > +}; > + > +static void mss_spi_realize(DeviceState *dev, Error **errp) > +{ > + MSSSpiState *s = MSS_SPI(dev); > + SysBusDevice *sbd = SYS_BUS_DEVICE(dev); > + > + s->spi = ssi_create_bus(dev, "spi"); > + > + sysbus_init_irq(sbd, &s->irq); > + ssi_auto_connect_slaves(dev, &s->cs_line, s->spi); > + sysbus_init_irq(sbd, &s->cs_line); > + > + memory_region_init_io(&s->mmio, OBJECT(s), &spi_ops, s, > + TYPE_MSS_SPI, R_SPI_MAX * 4); > + sysbus_init_mmio(sbd, &s->mmio); > + > + fifo32_create(&s->tx_fifo, FIFO_CAPACITY); > + fifo32_create(&s->rx_fifo, FIFO_CAPACITY); > +} > + > +static const VMStateDescription vmstate_mss_spi = { > + .name = TYPE_MSS_SPI, > + .version_id = 1, > + .minimum_version_id = 1, > + .fields = (VMStateField[]) { > + VMSTATE_FIFO32(tx_fifo, MSSSpiState), > + VMSTATE_FIFO32(rx_fifo, MSSSpiState), > + VMSTATE_UINT32_ARRAY(regs, MSSSpiState, R_SPI_MAX), > + VMSTATE_END_OF_LIST() > + } > +}; > + > +static void mss_spi_class_init(ObjectClass *klass, void *data) > +{ > + DeviceClass *dc = DEVICE_CLASS(klass); > + > + dc->realize = mss_spi_realize; > + dc->reset = mss_spi_reset; > + dc->vmsd = &vmstate_mss_spi; > +} > + > +static const TypeInfo mss_spi_info = { > + .name = TYPE_MSS_SPI, > + .parent = TYPE_SYS_BUS_DEVICE, > + .instance_size = sizeof(MSSSpiState), > + .class_init = mss_spi_class_init, > +}; > + > +static void mss_spi_register_types(void) > +{ > + type_register_static(&mss_spi_info); > +} > + > +type_init(mss_spi_register_types) > diff --git a/include/hw/ssi/mss-spi.h b/include/hw/ssi/mss-spi.h > new file mode 100644 > index 0000000..6c8c0b1 > --- /dev/null > +++ b/include/hw/ssi/mss-spi.h > @@ -0,0 +1,62 @@ > +/* > + * Microsemi SmartFusion2 SPI > + * > + * Copyright (c) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com> > + * > + * 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. > + */ > + > +#ifndef HW_MSS_SPI_H > +#define HW_MSS_SPI_H > + > +#include "qemu/osdep.h" > +#include "hw/sysbus.h" > +#include "hw/hw.h" > +#include "hw/ssi/ssi.h" > +#include "qemu/fifo32.h" > +#include "sysemu/sysemu.h" > +#include "qemu/log.h" > + > +#define TYPE_MSS_SPI "mss-spi" > +#define MSS_SPI(obj) OBJECT_CHECK(MSSSpiState, (obj), TYPE_MSS_SPI) > + > +#define R_SPI_MAX 16 > + > +typedef struct MSSSpiState { > + SysBusDevice parent_obj; > + > + MemoryRegion mmio; > + > + qemu_irq irq; > + > + qemu_irq cs_line; > + > + SSIBus *spi; > + > + Fifo32 rx_fifo; > + Fifo32 tx_fifo; > + > + int fifo_depth; > + uint32_t frame_count; > + bool enabled; > + > + uint32_t regs[R_SPI_MAX]; > +} MSSSpiState; > + > +#endif /* HW_MSS_SPI_H */ > -- > 2.5.0 >
Hi Alistair, On Wed, Jul 5, 2017 at 11:48 PM, Alistair Francis <alistair23@gmail.com> wrote: > On Sun, Jul 2, 2017 at 9:45 PM, Subbaraya Sundeep > <sundeep.lkml@gmail.com> wrote: > > Modelled Microsemi's Smartfusion2 SPI controller. > > > > Signed-off-by: Subbaraya Sundeep <sundeep.lkml@gmail.com> > > --- > > hw/ssi/Makefile.objs | 1 + > > hw/ssi/mss-spi.c | 414 ++++++++++++++++++++++++++++++ > +++++++++++++++++ > > include/hw/ssi/mss-spi.h | 62 +++++++ > > 3 files changed, 477 insertions(+) > > create mode 100644 hw/ssi/mss-spi.c > > create mode 100644 include/hw/ssi/mss-spi.h > > > > diff --git a/hw/ssi/Makefile.objs b/hw/ssi/Makefile.objs > > index 487add2..f5bcc65 100644 > > --- a/hw/ssi/Makefile.objs > > +++ b/hw/ssi/Makefile.objs > > @@ -4,6 +4,7 @@ common-obj-$(CONFIG_XILINX_SPI) += xilinx_spi.o > > common-obj-$(CONFIG_XILINX_SPIPS) += xilinx_spips.o > > common-obj-$(CONFIG_ASPEED_SOC) += aspeed_smc.o > > common-obj-$(CONFIG_STM32F2XX_SPI) += stm32f2xx_spi.o > > +common-obj-$(CONFIG_MSF2) += mss-spi.o > > > > obj-$(CONFIG_OMAP) += omap_spi.o > > obj-$(CONFIG_IMX) += imx_spi.o > > diff --git a/hw/ssi/mss-spi.c b/hw/ssi/mss-spi.c > > new file mode 100644 > > index 0000000..a572abc > > --- /dev/null > > +++ b/hw/ssi/mss-spi.c > > @@ -0,0 +1,414 @@ > > +/* > > + * Block model of SPI controller present in > > + * Microsemi's SmartFusion2 and SmartFusion SoCs. > > + * > > + * Copyright (C) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com> > > + * > > + * 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 "hw/ssi/mss-spi.h" > > Same comment as earlier patches. > Ok will fix it. > > > + > > +#ifndef MSS_SPI_ERR_DEBUG > > +#define MSS_SPI_ERR_DEBUG 0 > > +#endif > > + > > +#define DB_PRINT_L(lvl, fmt, args...) do { \ > > + if (MSS_SPI_ERR_DEBUG >= lvl) { \ > > + qemu_log("%s: " fmt "\n", __func__, ## args); \ > > + } \ > > +} while (0); > > + > > +#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args) > > + > > +#define FIFO_CAPACITY 32 > > +#define FIFO_CAPACITY 32 > > + > > +#define R_SPI_CONTROL 0 > > +#define R_SPI_DFSIZE 1 > > +#define R_SPI_STATUS 2 > > +#define R_SPI_INTCLR 3 > > +#define R_SPI_RX 4 > > +#define R_SPI_TX 5 > > +#define R_SPI_CLKGEN 6 > > +#define R_SPI_SS 7 > > +#define R_SPI_MIS 8 > > +#define R_SPI_RIS 9 > > + > > +#define S_TXDONE (1 << 0) > > +#define S_RXRDY (1 << 1) > > +#define S_RXCHOVRF (1 << 2) > > +#define S_RXFIFOFUL (1 << 4) > > +#define S_RXFIFOFULNXT (1 << 5) > > +#define S_RXFIFOEMP (1 << 6) > > +#define S_RXFIFOEMPNXT (1 << 7) > > +#define S_TXFIFOFUL (1 << 8) > > +#define S_TXFIFOFULNXT (1 << 9) > > +#define S_TXFIFOEMP (1 << 10) > > +#define S_TXFIFOEMPNXT (1 << 11) > > +#define S_FRAMESTART (1 << 12) > > +#define S_SSEL (1 << 13) > > +#define S_ACTIVE (1 << 14) > > + > > +#define C_ENABLE (1 << 0) > > +#define C_MODE (1 << 1) > > +#define C_INTRXDATA (1 << 4) > > +#define C_INTTXDATA (1 << 5) > > +#define C_INTRXOVRFLO (1 << 6) > > +#define C_SPS (1 << 26) > > +#define C_BIGFIFO (1 << 29) > > +#define C_RESET (1 << 31) > > + > > +#define FRAMESZ_MASK 0x1F > > +#define FMCOUNT_MASK 0x00FFFF00 > > +#define FMCOUNT_SHIFT 8 > > + > > +static void txfifo_reset(MSSSpiState *s) > > +{ > > + fifo32_reset(&s->tx_fifo); > > + > > + s->regs[R_SPI_STATUS] &= ~S_TXFIFOFUL; > > + s->regs[R_SPI_STATUS] |= S_TXFIFOEMP; > > +} > > + > > +static void rxfifo_reset(MSSSpiState *s) > > +{ > > + fifo32_reset(&s->rx_fifo); > > + > > + s->regs[R_SPI_STATUS] &= ~S_RXFIFOFUL; > > + s->regs[R_SPI_STATUS] |= S_RXFIFOEMP; > > +} > > + > > +static void set_fifodepth(MSSSpiState *s) > > +{ > > + unsigned int size = s->regs[R_SPI_DFSIZE] & FRAMESZ_MASK; > > + > > + if (size <= 8) { > > + s->fifo_depth = 32; > > + } else if (size <= 16) { > > + s->fifo_depth = 16; > > + } else if (size <= 32) { > > + s->fifo_depth = 8; > > + } else { > > + s->fifo_depth = 4; > > + } > > +} > > + > > +static void mss_spi_do_reset(MSSSpiState *s) > > +{ > > + memset(s->regs, 0, sizeof s->regs); > > + s->regs[R_SPI_CONTROL] = 0x80000102; > > + s->regs[R_SPI_DFSIZE] = 0x4; > > + s->regs[R_SPI_STATUS] = S_SSEL | S_TXFIFOEMP | S_RXFIFOEMP; > > + s->regs[R_SPI_CLKGEN] = 0x7; > > + s->regs[R_SPI_RIS] = 0x0; > > + > > + s->fifo_depth = 4; > > + s->frame_count = 1; > > + s->enabled = false; > > + > > + rxfifo_reset(s); > > + txfifo_reset(s); > > +} > > + > > +static void update_mis(MSSSpiState *s) > > +{ > > + uint32_t reg = s->regs[R_SPI_CONTROL]; > > + uint32_t tmp; > > + > > + /* > > + * form the Control register interrupt enable bits > > + * same as RIS, MIS and Interrupt clear registers for simplicity > > + */ > > + tmp = ((reg & C_INTRXOVRFLO) >> 4) | ((reg & C_INTRXDATA) >> 3) | > > + ((reg & C_INTTXDATA) >> 5); > > + s->regs[R_SPI_MIS] |= tmp & s->regs[R_SPI_RIS]; > > +} > > + > > +static void spi_update_irq(MSSSpiState *s) > > +{ > > + int irq; > > + > > + update_mis(s); > > + irq = !!(s->regs[R_SPI_MIS]); > > + > > + qemu_set_irq(s->irq, irq); > > +} > > + > > +static void mss_spi_reset(DeviceState *d) > > +{ > > + mss_spi_do_reset(MSS_SPI(d)); > > +} > > + > > +static uint64_t > > +spi_read(void *opaque, hwaddr addr, unsigned int size) > > +{ > > + MSSSpiState *s = opaque; > > + uint32_t ret = 0; > > + > > + addr >>= 2; > > + switch (addr) { > > + case R_SPI_RX: > > + s->regs[R_SPI_STATUS] &= ~S_RXFIFOFUL; > > + s->regs[R_SPI_STATUS] &= ~S_RXCHOVRF; > > + ret = fifo32_pop(&s->rx_fifo); > > + if (fifo32_is_empty(&s->rx_fifo)) { > > + s->regs[R_SPI_STATUS] |= S_RXFIFOEMP; > > + } > > + break; > > + > > + case R_SPI_MIS: > > + update_mis(s); > > + ret = s->regs[R_SPI_MIS]; > > + break; > > + > > + default: > > + if (addr < ARRAY_SIZE(s->regs)) { > > + ret = s->regs[addr]; > > + } else { > > + qemu_log_mask(LOG_GUEST_ERROR, > > + "%s: Bad offset 0x%" HWADDR_PRIx "\n", > __func__, > > + addr * 4); > > I think return here to avoid the next print statement and irq update. > Ok will fix it. > > > + } > > + break; > > + } > > + > > + DB_PRINT("addr=0x%" HWADDR_PRIx " = 0x%" PRIx32, addr * 4, ret); > > + spi_update_irq(s); > > + return ret; > > +} > > + > > +static void assert_cs(MSSSpiState *s) > > +{ > > + qemu_set_irq(s->cs_line, 0); > > +} > > + > > +static void deassert_cs(MSSSpiState *s) > > +{ > > + qemu_set_irq(s->cs_line, 1); > > +} > > + > > +static void spi_flush_txfifo(MSSSpiState *s) > > +{ > > + uint32_t tx; > > + uint32_t rx; > > + bool sps = !!(s->regs[R_SPI_CONTROL] & C_SPS); > > + > > + /* > > + * Chip Select(CS) is automatically controlled by this controller. > > + * If SPS bit is set in Control register then CS is asserted > > + * until all the frames set in frame count of Control register are > > + * transferred. If SPS is not set then CS pulses between frames. > > + * Note that Slave Select register specifies which of the CS line > > + * has to be controlled automatically by controller. Bits SS[7:1] > are for > > + * masters in FPGA fabric since we model only Microcontroller > subsystem > > + * of Smartfusion2 we control only one CS(SS[0]) line. > > + */ > > + while (!fifo32_is_empty(&s->tx_fifo) && s->frame_count) { > > + assert_cs(s); > > + > > + s->regs[R_SPI_STATUS] &= ~(S_TXDONE | S_RXRDY); > > + > > + tx = fifo32_pop(&s->tx_fifo); > > + DB_PRINT("data tx:0x%" PRIx32, tx); > > + rx = ssi_transfer(s->spi, tx); > > + DB_PRINT("data rx:0x%" PRIx32, rx); > > + > > + if (fifo32_num_used(&s->rx_fifo) == s->fifo_depth) { > > + s->regs[R_SPI_STATUS] |= S_RXCHOVRF; > > + s->regs[R_SPI_RIS] |= S_RXCHOVRF; > > + } else { > > + fifo32_push(&s->rx_fifo, rx); > > + s->regs[R_SPI_STATUS] &= ~S_RXFIFOEMP; > > + if (fifo32_num_used(&s->rx_fifo) == (s->fifo_depth - 1)) { > > + s->regs[R_SPI_STATUS] |= S_RXFIFOFULNXT; > > + } > > + if (fifo32_num_used(&s->rx_fifo) == s->fifo_depth) { > > I'd use an else if to indicate that both can't happen at the same time. > Ok will add else statement. > > > + s->regs[R_SPI_STATUS] |= S_RXFIFOFUL; > > + } > > + } > > + s->frame_count--; > > + if (!sps) { > > + deassert_cs(s); > > + assert_cs(s); > > Do you need the asert here? Can't you just wait for it to hit the > start of the loop? > > Does it deassert assert and deassert after a transfer has finished? You are right. I guess I have written like that to indicate a pulse in the loop :). I will remove the assert. > > > + } > > + } > > + > > + if (!sps) { > > + deassert_cs(s); > > + } > > + > > + if (!s->frame_count) { > > + s->frame_count = (s->regs[R_SPI_CONTROL] & FMCOUNT_MASK) >> > > + FMCOUNT_SHIFT; > > + if (sps) { > > + deassert_cs(s); > > + } > > + s->regs[R_SPI_RIS] |= S_TXDONE | S_RXRDY; > > + s->regs[R_SPI_STATUS] |= S_TXDONE | S_RXRDY; > > + } > > +} > > + > > +static void spi_write(void *opaque, hwaddr addr, > > + uint64_t val64, unsigned int size) > > +{ > > + MSSSpiState *s = opaque; > > + uint32_t value = val64; > > + > > + DB_PRINT("addr=0x%" HWADDR_PRIx " =0x%" PRIx32, addr, value); > > + addr >>= 2; > > + > > + switch (addr) { > > + case R_SPI_TX: > > + /* adding to already full FIFO */ > > + if (fifo32_num_used(&s->tx_fifo) == s->fifo_depth) { > > + break; > > + } > > + s->regs[R_SPI_STATUS] &= ~S_TXFIFOEMP; > > + fifo32_push(&s->tx_fifo, value); > > + if (fifo32_num_used(&s->tx_fifo) == (s->fifo_depth - 1)) { > > + s->regs[R_SPI_STATUS] |= S_TXFIFOFULNXT; > > + } > > else if here as well > > Ok will add else if. Thanks, Sundeep > Thanks, > Alistair > > > + if (fifo32_num_used(&s->tx_fifo) == s->fifo_depth) { > > + s->regs[R_SPI_STATUS] |= S_TXFIFOFUL; > > + } > > + if (s->enabled) { > > + spi_flush_txfifo(s); > > + } > > + break; > > + > > + case R_SPI_CONTROL: > > + s->regs[R_SPI_CONTROL] = value; > > + if (value & C_BIGFIFO) { > > + set_fifodepth(s); > > + } else { > > + s->fifo_depth = 4; > > + } > > + s->enabled = value & C_ENABLE; > > + s->frame_count = (value & FMCOUNT_MASK) >> FMCOUNT_SHIFT; > > + if (value & C_RESET) { > > + mss_spi_do_reset(s); > > + } > > + break; > > + > > + case R_SPI_DFSIZE: > > + if (s->enabled) { > > + break; > > + } > > + s->regs[R_SPI_DFSIZE] = value; > > + break; > > + > > + case R_SPI_INTCLR: > > + s->regs[R_SPI_INTCLR] = value; > > + if (value & S_TXDONE) { > > + s->regs[R_SPI_RIS] &= ~S_TXDONE; > > + } > > + if (value & S_RXRDY) { > > + s->regs[R_SPI_RIS] &= ~S_RXRDY; > > + } > > + if (value & S_RXCHOVRF) { > > + s->regs[R_SPI_RIS] &= ~S_RXCHOVRF; > > + } > > + break; > > + > > + case R_SPI_MIS: > > + case R_SPI_STATUS: > > + case R_SPI_RIS: > > + qemu_log_mask(LOG_GUEST_ERROR, > > + "%s: Write to read only register 0x%" > HWADDR_PRIx "\n", > > + __func__, addr * 4); > > + break; > > + > > + default: > > + if (addr < ARRAY_SIZE(s->regs)) { > > + s->regs[addr] = value; > > + } else { > > + qemu_log_mask(LOG_GUEST_ERROR, > > + "%s: Bad offset 0x%" HWADDR_PRIx "\n", > __func__, > > + addr * 4); > > + } > > + break; > > + } > > + > > + spi_update_irq(s); > > +} > > + > > +static const MemoryRegionOps spi_ops = { > > + .read = spi_read, > > + .write = spi_write, > > + .endianness = DEVICE_NATIVE_ENDIAN, > > + .valid = { > > + .min_access_size = 1, > > + .max_access_size = 4 > > + } > > +}; > > + > > +static void mss_spi_realize(DeviceState *dev, Error **errp) > > +{ > > + MSSSpiState *s = MSS_SPI(dev); > > + SysBusDevice *sbd = SYS_BUS_DEVICE(dev); > > + > > + s->spi = ssi_create_bus(dev, "spi"); > > + > > + sysbus_init_irq(sbd, &s->irq); > > + ssi_auto_connect_slaves(dev, &s->cs_line, s->spi); > > + sysbus_init_irq(sbd, &s->cs_line); > > + > > + memory_region_init_io(&s->mmio, OBJECT(s), &spi_ops, s, > > + TYPE_MSS_SPI, R_SPI_MAX * 4); > > + sysbus_init_mmio(sbd, &s->mmio); > > + > > + fifo32_create(&s->tx_fifo, FIFO_CAPACITY); > > + fifo32_create(&s->rx_fifo, FIFO_CAPACITY); > > +} > > + > > +static const VMStateDescription vmstate_mss_spi = { > > + .name = TYPE_MSS_SPI, > > + .version_id = 1, > > + .minimum_version_id = 1, > > + .fields = (VMStateField[]) { > > + VMSTATE_FIFO32(tx_fifo, MSSSpiState), > > + VMSTATE_FIFO32(rx_fifo, MSSSpiState), > > + VMSTATE_UINT32_ARRAY(regs, MSSSpiState, R_SPI_MAX), > > + VMSTATE_END_OF_LIST() > > + } > > +}; > > + > > +static void mss_spi_class_init(ObjectClass *klass, void *data) > > +{ > > + DeviceClass *dc = DEVICE_CLASS(klass); > > + > > + dc->realize = mss_spi_realize; > > + dc->reset = mss_spi_reset; > > + dc->vmsd = &vmstate_mss_spi; > > +} > > + > > +static const TypeInfo mss_spi_info = { > > + .name = TYPE_MSS_SPI, > > + .parent = TYPE_SYS_BUS_DEVICE, > > + .instance_size = sizeof(MSSSpiState), > > + .class_init = mss_spi_class_init, > > +}; > > + > > +static void mss_spi_register_types(void) > > +{ > > + type_register_static(&mss_spi_info); > > +} > > + > > +type_init(mss_spi_register_types) > > diff --git a/include/hw/ssi/mss-spi.h b/include/hw/ssi/mss-spi.h > > new file mode 100644 > > index 0000000..6c8c0b1 > > --- /dev/null > > +++ b/include/hw/ssi/mss-spi.h > > @@ -0,0 +1,62 @@ > > +/* > > + * Microsemi SmartFusion2 SPI > > + * > > + * Copyright (c) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com> > > + * > > + * 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. > > + */ > > + > > +#ifndef HW_MSS_SPI_H > > +#define HW_MSS_SPI_H > > + > > +#include "qemu/osdep.h" > > +#include "hw/sysbus.h" > > +#include "hw/hw.h" > > +#include "hw/ssi/ssi.h" > > +#include "qemu/fifo32.h" > > +#include "sysemu/sysemu.h" > > +#include "qemu/log.h" > > + > > +#define TYPE_MSS_SPI "mss-spi" > > +#define MSS_SPI(obj) OBJECT_CHECK(MSSSpiState, (obj), TYPE_MSS_SPI) > > + > > +#define R_SPI_MAX 16 > > + > > +typedef struct MSSSpiState { > > + SysBusDevice parent_obj; > > + > > + MemoryRegion mmio; > > + > > + qemu_irq irq; > > + > > + qemu_irq cs_line; > > + > > + SSIBus *spi; > > + > > + Fifo32 rx_fifo; > > + Fifo32 tx_fifo; > > + > > + int fifo_depth; > > + uint32_t frame_count; > > + bool enabled; > > + > > + uint32_t regs[R_SPI_MAX]; > > +} MSSSpiState; > > + > > +#endif /* HW_MSS_SPI_H */ > > -- > > 2.5.0 > > >
diff --git a/hw/ssi/Makefile.objs b/hw/ssi/Makefile.objs index 487add2..f5bcc65 100644 --- a/hw/ssi/Makefile.objs +++ b/hw/ssi/Makefile.objs @@ -4,6 +4,7 @@ common-obj-$(CONFIG_XILINX_SPI) += xilinx_spi.o common-obj-$(CONFIG_XILINX_SPIPS) += xilinx_spips.o common-obj-$(CONFIG_ASPEED_SOC) += aspeed_smc.o common-obj-$(CONFIG_STM32F2XX_SPI) += stm32f2xx_spi.o +common-obj-$(CONFIG_MSF2) += mss-spi.o obj-$(CONFIG_OMAP) += omap_spi.o obj-$(CONFIG_IMX) += imx_spi.o diff --git a/hw/ssi/mss-spi.c b/hw/ssi/mss-spi.c new file mode 100644 index 0000000..a572abc --- /dev/null +++ b/hw/ssi/mss-spi.c @@ -0,0 +1,414 @@ +/* + * Block model of SPI controller present in + * Microsemi's SmartFusion2 and SmartFusion SoCs. + * + * Copyright (C) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com> + * + * 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 "hw/ssi/mss-spi.h" + +#ifndef MSS_SPI_ERR_DEBUG +#define MSS_SPI_ERR_DEBUG 0 +#endif + +#define DB_PRINT_L(lvl, fmt, args...) do { \ + if (MSS_SPI_ERR_DEBUG >= lvl) { \ + qemu_log("%s: " fmt "\n", __func__, ## args); \ + } \ +} while (0); + +#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args) + +#define FIFO_CAPACITY 32 +#define FIFO_CAPACITY 32 + +#define R_SPI_CONTROL 0 +#define R_SPI_DFSIZE 1 +#define R_SPI_STATUS 2 +#define R_SPI_INTCLR 3 +#define R_SPI_RX 4 +#define R_SPI_TX 5 +#define R_SPI_CLKGEN 6 +#define R_SPI_SS 7 +#define R_SPI_MIS 8 +#define R_SPI_RIS 9 + +#define S_TXDONE (1 << 0) +#define S_RXRDY (1 << 1) +#define S_RXCHOVRF (1 << 2) +#define S_RXFIFOFUL (1 << 4) +#define S_RXFIFOFULNXT (1 << 5) +#define S_RXFIFOEMP (1 << 6) +#define S_RXFIFOEMPNXT (1 << 7) +#define S_TXFIFOFUL (1 << 8) +#define S_TXFIFOFULNXT (1 << 9) +#define S_TXFIFOEMP (1 << 10) +#define S_TXFIFOEMPNXT (1 << 11) +#define S_FRAMESTART (1 << 12) +#define S_SSEL (1 << 13) +#define S_ACTIVE (1 << 14) + +#define C_ENABLE (1 << 0) +#define C_MODE (1 << 1) +#define C_INTRXDATA (1 << 4) +#define C_INTTXDATA (1 << 5) +#define C_INTRXOVRFLO (1 << 6) +#define C_SPS (1 << 26) +#define C_BIGFIFO (1 << 29) +#define C_RESET (1 << 31) + +#define FRAMESZ_MASK 0x1F +#define FMCOUNT_MASK 0x00FFFF00 +#define FMCOUNT_SHIFT 8 + +static void txfifo_reset(MSSSpiState *s) +{ + fifo32_reset(&s->tx_fifo); + + s->regs[R_SPI_STATUS] &= ~S_TXFIFOFUL; + s->regs[R_SPI_STATUS] |= S_TXFIFOEMP; +} + +static void rxfifo_reset(MSSSpiState *s) +{ + fifo32_reset(&s->rx_fifo); + + s->regs[R_SPI_STATUS] &= ~S_RXFIFOFUL; + s->regs[R_SPI_STATUS] |= S_RXFIFOEMP; +} + +static void set_fifodepth(MSSSpiState *s) +{ + unsigned int size = s->regs[R_SPI_DFSIZE] & FRAMESZ_MASK; + + if (size <= 8) { + s->fifo_depth = 32; + } else if (size <= 16) { + s->fifo_depth = 16; + } else if (size <= 32) { + s->fifo_depth = 8; + } else { + s->fifo_depth = 4; + } +} + +static void mss_spi_do_reset(MSSSpiState *s) +{ + memset(s->regs, 0, sizeof s->regs); + s->regs[R_SPI_CONTROL] = 0x80000102; + s->regs[R_SPI_DFSIZE] = 0x4; + s->regs[R_SPI_STATUS] = S_SSEL | S_TXFIFOEMP | S_RXFIFOEMP; + s->regs[R_SPI_CLKGEN] = 0x7; + s->regs[R_SPI_RIS] = 0x0; + + s->fifo_depth = 4; + s->frame_count = 1; + s->enabled = false; + + rxfifo_reset(s); + txfifo_reset(s); +} + +static void update_mis(MSSSpiState *s) +{ + uint32_t reg = s->regs[R_SPI_CONTROL]; + uint32_t tmp; + + /* + * form the Control register interrupt enable bits + * same as RIS, MIS and Interrupt clear registers for simplicity + */ + tmp = ((reg & C_INTRXOVRFLO) >> 4) | ((reg & C_INTRXDATA) >> 3) | + ((reg & C_INTTXDATA) >> 5); + s->regs[R_SPI_MIS] |= tmp & s->regs[R_SPI_RIS]; +} + +static void spi_update_irq(MSSSpiState *s) +{ + int irq; + + update_mis(s); + irq = !!(s->regs[R_SPI_MIS]); + + qemu_set_irq(s->irq, irq); +} + +static void mss_spi_reset(DeviceState *d) +{ + mss_spi_do_reset(MSS_SPI(d)); +} + +static uint64_t +spi_read(void *opaque, hwaddr addr, unsigned int size) +{ + MSSSpiState *s = opaque; + uint32_t ret = 0; + + addr >>= 2; + switch (addr) { + case R_SPI_RX: + s->regs[R_SPI_STATUS] &= ~S_RXFIFOFUL; + s->regs[R_SPI_STATUS] &= ~S_RXCHOVRF; + ret = fifo32_pop(&s->rx_fifo); + if (fifo32_is_empty(&s->rx_fifo)) { + s->regs[R_SPI_STATUS] |= S_RXFIFOEMP; + } + break; + + case R_SPI_MIS: + update_mis(s); + ret = s->regs[R_SPI_MIS]; + break; + + default: + if (addr < ARRAY_SIZE(s->regs)) { + ret = s->regs[addr]; + } else { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, + addr * 4); + } + break; + } + + DB_PRINT("addr=0x%" HWADDR_PRIx " = 0x%" PRIx32, addr * 4, ret); + spi_update_irq(s); + return ret; +} + +static void assert_cs(MSSSpiState *s) +{ + qemu_set_irq(s->cs_line, 0); +} + +static void deassert_cs(MSSSpiState *s) +{ + qemu_set_irq(s->cs_line, 1); +} + +static void spi_flush_txfifo(MSSSpiState *s) +{ + uint32_t tx; + uint32_t rx; + bool sps = !!(s->regs[R_SPI_CONTROL] & C_SPS); + + /* + * Chip Select(CS) is automatically controlled by this controller. + * If SPS bit is set in Control register then CS is asserted + * until all the frames set in frame count of Control register are + * transferred. If SPS is not set then CS pulses between frames. + * Note that Slave Select register specifies which of the CS line + * has to be controlled automatically by controller. Bits SS[7:1] are for + * masters in FPGA fabric since we model only Microcontroller subsystem + * of Smartfusion2 we control only one CS(SS[0]) line. + */ + while (!fifo32_is_empty(&s->tx_fifo) && s->frame_count) { + assert_cs(s); + + s->regs[R_SPI_STATUS] &= ~(S_TXDONE | S_RXRDY); + + tx = fifo32_pop(&s->tx_fifo); + DB_PRINT("data tx:0x%" PRIx32, tx); + rx = ssi_transfer(s->spi, tx); + DB_PRINT("data rx:0x%" PRIx32, rx); + + if (fifo32_num_used(&s->rx_fifo) == s->fifo_depth) { + s->regs[R_SPI_STATUS] |= S_RXCHOVRF; + s->regs[R_SPI_RIS] |= S_RXCHOVRF; + } else { + fifo32_push(&s->rx_fifo, rx); + s->regs[R_SPI_STATUS] &= ~S_RXFIFOEMP; + if (fifo32_num_used(&s->rx_fifo) == (s->fifo_depth - 1)) { + s->regs[R_SPI_STATUS] |= S_RXFIFOFULNXT; + } + if (fifo32_num_used(&s->rx_fifo) == s->fifo_depth) { + s->regs[R_SPI_STATUS] |= S_RXFIFOFUL; + } + } + s->frame_count--; + if (!sps) { + deassert_cs(s); + assert_cs(s); + } + } + + if (!sps) { + deassert_cs(s); + } + + if (!s->frame_count) { + s->frame_count = (s->regs[R_SPI_CONTROL] & FMCOUNT_MASK) >> + FMCOUNT_SHIFT; + if (sps) { + deassert_cs(s); + } + s->regs[R_SPI_RIS] |= S_TXDONE | S_RXRDY; + s->regs[R_SPI_STATUS] |= S_TXDONE | S_RXRDY; + } +} + +static void spi_write(void *opaque, hwaddr addr, + uint64_t val64, unsigned int size) +{ + MSSSpiState *s = opaque; + uint32_t value = val64; + + DB_PRINT("addr=0x%" HWADDR_PRIx " =0x%" PRIx32, addr, value); + addr >>= 2; + + switch (addr) { + case R_SPI_TX: + /* adding to already full FIFO */ + if (fifo32_num_used(&s->tx_fifo) == s->fifo_depth) { + break; + } + s->regs[R_SPI_STATUS] &= ~S_TXFIFOEMP; + fifo32_push(&s->tx_fifo, value); + if (fifo32_num_used(&s->tx_fifo) == (s->fifo_depth - 1)) { + s->regs[R_SPI_STATUS] |= S_TXFIFOFULNXT; + } + if (fifo32_num_used(&s->tx_fifo) == s->fifo_depth) { + s->regs[R_SPI_STATUS] |= S_TXFIFOFUL; + } + if (s->enabled) { + spi_flush_txfifo(s); + } + break; + + case R_SPI_CONTROL: + s->regs[R_SPI_CONTROL] = value; + if (value & C_BIGFIFO) { + set_fifodepth(s); + } else { + s->fifo_depth = 4; + } + s->enabled = value & C_ENABLE; + s->frame_count = (value & FMCOUNT_MASK) >> FMCOUNT_SHIFT; + if (value & C_RESET) { + mss_spi_do_reset(s); + } + break; + + case R_SPI_DFSIZE: + if (s->enabled) { + break; + } + s->regs[R_SPI_DFSIZE] = value; + break; + + case R_SPI_INTCLR: + s->regs[R_SPI_INTCLR] = value; + if (value & S_TXDONE) { + s->regs[R_SPI_RIS] &= ~S_TXDONE; + } + if (value & S_RXRDY) { + s->regs[R_SPI_RIS] &= ~S_RXRDY; + } + if (value & S_RXCHOVRF) { + s->regs[R_SPI_RIS] &= ~S_RXCHOVRF; + } + break; + + case R_SPI_MIS: + case R_SPI_STATUS: + case R_SPI_RIS: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Write to read only register 0x%" HWADDR_PRIx "\n", + __func__, addr * 4); + break; + + default: + if (addr < ARRAY_SIZE(s->regs)) { + s->regs[addr] = value; + } else { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, + addr * 4); + } + break; + } + + spi_update_irq(s); +} + +static const MemoryRegionOps spi_ops = { + .read = spi_read, + .write = spi_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .valid = { + .min_access_size = 1, + .max_access_size = 4 + } +}; + +static void mss_spi_realize(DeviceState *dev, Error **errp) +{ + MSSSpiState *s = MSS_SPI(dev); + SysBusDevice *sbd = SYS_BUS_DEVICE(dev); + + s->spi = ssi_create_bus(dev, "spi"); + + sysbus_init_irq(sbd, &s->irq); + ssi_auto_connect_slaves(dev, &s->cs_line, s->spi); + sysbus_init_irq(sbd, &s->cs_line); + + memory_region_init_io(&s->mmio, OBJECT(s), &spi_ops, s, + TYPE_MSS_SPI, R_SPI_MAX * 4); + sysbus_init_mmio(sbd, &s->mmio); + + fifo32_create(&s->tx_fifo, FIFO_CAPACITY); + fifo32_create(&s->rx_fifo, FIFO_CAPACITY); +} + +static const VMStateDescription vmstate_mss_spi = { + .name = TYPE_MSS_SPI, + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_FIFO32(tx_fifo, MSSSpiState), + VMSTATE_FIFO32(rx_fifo, MSSSpiState), + VMSTATE_UINT32_ARRAY(regs, MSSSpiState, R_SPI_MAX), + VMSTATE_END_OF_LIST() + } +}; + +static void mss_spi_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->realize = mss_spi_realize; + dc->reset = mss_spi_reset; + dc->vmsd = &vmstate_mss_spi; +} + +static const TypeInfo mss_spi_info = { + .name = TYPE_MSS_SPI, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(MSSSpiState), + .class_init = mss_spi_class_init, +}; + +static void mss_spi_register_types(void) +{ + type_register_static(&mss_spi_info); +} + +type_init(mss_spi_register_types) diff --git a/include/hw/ssi/mss-spi.h b/include/hw/ssi/mss-spi.h new file mode 100644 index 0000000..6c8c0b1 --- /dev/null +++ b/include/hw/ssi/mss-spi.h @@ -0,0 +1,62 @@ +/* + * Microsemi SmartFusion2 SPI + * + * Copyright (c) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com> + * + * 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. + */ + +#ifndef HW_MSS_SPI_H +#define HW_MSS_SPI_H + +#include "qemu/osdep.h" +#include "hw/sysbus.h" +#include "hw/hw.h" +#include "hw/ssi/ssi.h" +#include "qemu/fifo32.h" +#include "sysemu/sysemu.h" +#include "qemu/log.h" + +#define TYPE_MSS_SPI "mss-spi" +#define MSS_SPI(obj) OBJECT_CHECK(MSSSpiState, (obj), TYPE_MSS_SPI) + +#define R_SPI_MAX 16 + +typedef struct MSSSpiState { + SysBusDevice parent_obj; + + MemoryRegion mmio; + + qemu_irq irq; + + qemu_irq cs_line; + + SSIBus *spi; + + Fifo32 rx_fifo; + Fifo32 tx_fifo; + + int fifo_depth; + uint32_t frame_count; + bool enabled; + + uint32_t regs[R_SPI_MAX]; +} MSSSpiState; + +#endif /* HW_MSS_SPI_H */
Modelled Microsemi's Smartfusion2 SPI controller. Signed-off-by: Subbaraya Sundeep <sundeep.lkml@gmail.com> --- hw/ssi/Makefile.objs | 1 + hw/ssi/mss-spi.c | 414 +++++++++++++++++++++++++++++++++++++++++++++++ include/hw/ssi/mss-spi.h | 62 +++++++ 3 files changed, 477 insertions(+) create mode 100644 hw/ssi/mss-spi.c create mode 100644 include/hw/ssi/mss-spi.h