1 files changed, 330 insertions, 0 deletions
diff --git a/code/fe310/eos/spi.c b/code/fe310/eos/spi.c
new file mode 100644
index 0000000..fb47313
--- /dev/null
+++ b/code/fe310/eos/spi.c
@@ -0,0 +1,330 @@
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "encoding.h"
+#include "platform.h"
+
+#include "eos.h"
+#include "msgq.h"
+#include "interrupt.h"
+#include "event.h"
+
+#include "net.h"
+#include "spi.h"
+#include "spi_def.h"
+#include "irq_def.h"
+
+#define MIN(X, Y)               (((X) < (Y)) ? (X) : (Y))
+#define MAX(X, Y)               (((X) > (Y)) ? (X) : (Y))
+#define SPI_IOF_MASK            (((uint32_t)1 << IOF_SPI1_SCK) | ((uint32_t)1 << IOF_SPI1_MOSI) | ((uint32_t)1 << IOF_SPI1_MISO)) | ((uint32_t)1 << IOF_SPI1_SS0) | ((uint32_t)1 << IOF_SPI1_SS2) | ((uint32_t)1 << IOF_SPI1_SS3)
+
+static uint8_t spi_dev;
+static uint8_t spi_dev_cs_pin;
+static volatile uint8_t spi_state_flags;
+static unsigned char spi_in_xchg;
+
+static uint32_t spi_state_len = 0;
+static uint32_t spi_state_idx_tx = 0;
+static uint32_t spi_state_idx_rx = 0;
+static unsigned char *spi_state_buf = NULL;
+
+static eos_evt_handler_t evt_handler[EOS_SPI_MAX_DEV];
+
+static void spi_handle_evt(unsigned char type, unsigned char *buffer, uint16_t len) {
+    unsigned char idx = (type & ~EOS_EVT_MASK) - 1;
+    if (idx < EOS_SPI_MAX_DEV) {
+        evt_handler[idx](type, buffer, len);
+    } else {
+        eos_evtq_bad_handler(type, buffer, len);
+    }
+}
+
+void eos_spi_init(void) {
+    int i;
+
+    for (i=0; i<EOS_SPI_MAX_DEV; i++) {
+        evt_handler[i] = eos_evtq_bad_handler;
+    }
+    eos_evtq_set_handler(EOS_EVT_SPI, spi_handle_evt);
+    eos_intr_set(INT_SPI1_BASE, IRQ_PRIORITY_SPI_XCHG, NULL);
+
+    SPI1_REG(SPI_REG_SCKMODE) = SPI_MODE0;
+    SPI1_REG(SPI_REG_FMT) = SPI_FMT_PROTO(SPI_PROTO_S) |
+      SPI_FMT_ENDIAN(SPI_ENDIAN_MSB) |
+      SPI_FMT_DIR(SPI_DIR_RX) |
+      SPI_FMT_LEN(8);
+
+    GPIO_REG(GPIO_IOF_SEL) &= ~SPI_IOF_MASK;
+    GPIO_REG(GPIO_IOF_EN) |= SPI_IOF_MASK;
+
+    // There is no way here to change the CS polarity.
+    // SPI1_REG(SPI_REG_CSDEF) = 0xFFFF;
+}
+
+void eos_spi_start(unsigned char dev, uint32_t div, uint32_t csid, uint8_t pin) {
+    spi_dev = dev;
+    spi_state_flags = 0;
+    SPI1_REG(SPI_REG_SCKDIV) = div;
+    SPI1_REG(SPI_REG_CSID) = csid;
+    if (csid != SPI_CSID_NONE) {
+        SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_AUTO;
+    } else {
+        SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_OFF;
+        spi_dev_cs_pin = pin;
+    }
+    eos_intr_set_handler(INT_SPI1_BASE, eos_spi_handle_xchg);
+}
+
+void eos_spi_stop(void) {
+    eos_spi_flush();
+    spi_dev = 0;
+}
+
+void eos_spi_set_handler(unsigned char dev, eos_evt_handler_t handler) {
+    if (handler == NULL) handler = eos_evtq_bad_handler;
+    if (dev && (dev <= EOS_SPI_MAX_DEV)) evt_handler[dev - 1] = handler;
+}
+
+void _eos_spi_xchg_init(unsigned char *buffer, uint16_t len, uint8_t flags) {
+    spi_state_flags &= 0xF0;
+    spi_state_flags |= (SPI_FLAG_XCHG | flags);
+    spi_state_buf = buffer;
+    spi_state_len = len;
+    spi_state_idx_tx = 0;
+    spi_state_idx_rx = 0;
+}
+
+static void spi_xchg_finish(void) {
+    uint8_t done = 0;
+
+    while (!done) {
+        clear_csr(mstatus, MSTATUS_MIE);
+        done = !(spi_state_flags & SPI_FLAG_XCHG);
+        if (!done) asm volatile ("wfi");
+        set_csr(mstatus, MSTATUS_MIE);
+    }
+    spi_in_xchg = 0;
+}
+
+void eos_spi_xchg(unsigned char *buffer, uint16_t len, uint8_t flags) {
+    if (spi_in_xchg) spi_xchg_finish();
+
+    spi_in_xchg=1;
+    _eos_spi_xchg_init(buffer, len, flags);
+
+    eos_spi_cs_set();
+    SPI1_REG(SPI_REG_TXCTRL) = SPI_TXWM(SPI_SIZE_WM);
+    SPI1_REG(SPI_REG_IE) = SPI_IP_TXWM;
+}
+
+void eos_spi_handle_xchg(void) {
+    int i;
+    uint16_t sz_chunk = MIN(spi_state_len - spi_state_idx_tx, SPI_SIZE_CHUNK);
+
+    for (i=0; i<sz_chunk; i++) {
+        volatile uint32_t x = SPI1_REG(SPI_REG_TXFIFO);
+        if (x & SPI_TXFIFO_FULL) break;
+        SPI1_REG(SPI_REG_TXFIFO) = spi_state_buf[spi_state_idx_tx+i];
+    }
+    spi_state_idx_tx += i;
+
+    for (i=0; i<spi_state_idx_tx - spi_state_idx_rx; i++) {
+        volatile uint32_t x = SPI1_REG(SPI_REG_RXFIFO);
+        if (x & SPI_RXFIFO_EMPTY) break;
+        spi_state_buf[spi_state_idx_rx+i] = x & 0xFF;
+    }
+    spi_state_idx_rx += i;
+
+    if (spi_state_idx_tx == spi_state_len) {
+        if ((spi_state_idx_rx == spi_state_len) || (spi_state_flags & EOS_SPI_FLAG_TX)) {
+            spi_state_flags &= ~SPI_FLAG_XCHG;
+            if (!(spi_state_flags & EOS_SPI_FLAG_MORE)) eos_spi_cs_clear();
+            SPI1_REG(SPI_REG_IE) = 0x0;
+            if (spi_dev) eos_evtq_push_isr(EOS_EVT_SPI | spi_dev, spi_state_buf, spi_state_len);
+        } else {
+            SPI1_REG(SPI_REG_RXCTRL) = SPI_RXWM(MIN(spi_state_len - spi_state_idx_rx - 1, SPI_SIZE_WM - 1));
+            SPI1_REG(SPI_REG_IE) = SPI_IP_RXWM;
+        }
+    }
+}
+
+void eos_spi_cs_set(void) {
+	/* cs low */
+    if (SPI1_REG(SPI_REG_CSMODE) == SPI_CSMODE_OFF) {
+        GPIO_REG(GPIO_OUTPUT_VAL) &= ~(1 << spi_dev_cs_pin);
+    } else {
+        SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_HOLD;
+    }
+}
+
+void eos_spi_cs_clear(void) {
+	/* cs high */
+    if (SPI1_REG(SPI_REG_CSMODE) == SPI_CSMODE_OFF) {
+        GPIO_REG(GPIO_OUTPUT_VAL) |= (1 << spi_dev_cs_pin);
+    } else {
+        SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_AUTO;
+    }
+}
+
+uint8_t eos_spi_xchg8(uint8_t data, uint8_t flags) {
+    volatile uint32_t x = 0;
+    uint8_t rx = !(flags & EOS_SPI_FLAG_TX);
+
+    spi_state_flags &= 0xF0;
+    spi_state_flags |= flags;
+
+    while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+    SPI1_REG(SPI_REG_TXFIFO) = data;
+
+    if (rx) {
+        while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+    }
+
+    return x & 0xFF;
+}
+
+uint16_t eos_spi_xchg16(uint16_t data, uint8_t flags) {
+    volatile uint32_t x = 0;
+    uint8_t rx = !(flags & EOS_SPI_FLAG_TX);
+    uint16_t r = 0;
+
+    spi_state_flags &= 0xF0;
+    spi_state_flags |= flags;
+
+    if (flags & EOS_SPI_FLAG_BSWAP) {
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF);
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0xFF00) >> 8;
+    } else {
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0xFF00) >> 8;
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF);
+    }
+
+    if (rx) {
+        if (flags & EOS_SPI_FLAG_BSWAP) {
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF);
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 8;
+        } else {
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 8;
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF);
+        }
+    }
+
+    return r;
+}
+
+uint32_t eos_spi_xchg24(uint32_t data, uint8_t flags) {
+    volatile uint32_t x = 0;
+    uint8_t rx = !(flags & EOS_SPI_FLAG_TX);
+    uint32_t r = 0;
+
+    spi_state_flags &= 0xF0;
+    spi_state_flags |= flags;
+
+    if (flags & EOS_SPI_FLAG_BSWAP) {
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x000000FF);
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x0000FF00) >> 8;
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF0000) >> 16;
+    } else {
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF0000) >> 16;
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x0000FF00) >> 8;
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x000000FF);
+    }
+
+    if (rx) {
+        if (flags & EOS_SPI_FLAG_BSWAP) {
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF);
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 8;
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 16;
+        } else {
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 16;
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 8;
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF);
+        }
+    }
+
+    return r;
+}
+
+uint32_t eos_spi_xchg32(uint32_t data, uint8_t flags) {
+    volatile uint32_t x = 0;
+    uint8_t rx = !(flags & EOS_SPI_FLAG_TX);
+    uint32_t r = 0;
+
+    spi_state_flags &= 0xF0;
+    spi_state_flags |= flags;
+
+    if (flags & EOS_SPI_FLAG_BSWAP) {
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x000000FF);
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x0000FF00) >> 8;
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF0000) >> 16;
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0xFF000000) >> 24;
+    } else {
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0xFF000000) >> 24;
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF0000) >> 16;
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x0000FF00) >> 8;
+        while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
+        SPI1_REG(SPI_REG_TXFIFO) = (data & 0x000000FF);
+    }
+
+    if (rx) {
+        if (flags & EOS_SPI_FLAG_BSWAP) {
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF);
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 8;
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 16;
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 24;
+        } else {
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 24;
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 16;
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF) << 8;
+            while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
+            r |= (x & 0xFF);
+        }
+    }
+
+    return r;
+}
+
+void eos_spi_flush(void) {
+    volatile uint32_t x = 0;
+
+    if (spi_in_xchg) spi_xchg_finish();
+
+    SPI1_REG(SPI_REG_TXCTRL) = SPI_TXWM(1);
+    while (!x) {
+        if (SPI1_REG(SPI_REG_IP) & SPI_IP_TXWM) x = SPI1_REG(SPI_REG_RXFIFO) & SPI_RXFIFO_EMPTY;
+    }
+}