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authorSubbaraya Sundeep <sundeep.lkml@gmail.com>2017-09-20 17:17:35 -0300
committerPeter Maydell <peter.maydell@linaro.org>2017-09-21 16:36:56 +0100
commit268ee7deb4e9bea1c1f9911780f584f71edcf1e0 (patch)
treefe6da01c5bd8c581b7d091a3476044db187ad13e /hw
parent0ee1e1f4691cbe5c219be49ac9d0ff4ac4812530 (diff)
msf2: Add Smartfusion2 SPI controller
Modelled Microsemi's Smartfusion2 SPI controller. Signed-off-by: Subbaraya Sundeep <sundeep.lkml@gmail.com> Reviewed-by: Alistair Francis <alistair.francis@xilinx.com> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20170920201737.25723-4-f4bug@amsat.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw')
-rw-r--r--hw/ssi/Makefile.objs1
-rw-r--r--hw/ssi/mss-spi.c404
2 files changed, 405 insertions, 0 deletions
diff --git a/hw/ssi/Makefile.objs b/hw/ssi/Makefile.objs
index 487add2879..f5bcc65fe7 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 0000000000..5a8e308e69
--- /dev/null
+++ b/hw/ssi/mss-spi.c
@@ -0,0 +1,404 @@
+/*
+ * 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 "qemu/osdep.h"
+#include "hw/ssi/mss-spi.h"
+#include "qemu/log.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 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 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)
+{
+ MSSSpiState *s = MSS_SPI(d);
+
+ 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 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);
+ return ret;
+ }
+ 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;
+ } else 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);
+ }
+ }
+
+ if (!s->frame_count) {
+ s->frame_count = (s->regs[R_SPI_CONTROL] & FMCOUNT_MASK) >>
+ FMCOUNT_SHIFT;
+ 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 (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_reset(DEVICE(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)