2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2019 Axiado Corporation
7 * This software was developed in part by Philip Paeps and Kristof Provost
8 * under contract for Axiado Corporation.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/systm.h>
38 #include <sys/kernel.h>
40 #include <sys/module.h>
41 #include <sys/mutex.h>
44 #include <machine/bus.h>
45 #include <machine/cpu.h>
47 #include <dev/extres/clk/clk.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <dev/ofw/ofw_bus_subr.h>
51 #include <dev/ofw/openfirm.h>
53 #include <dev/spibus/spi.h>
54 #include <dev/spibus/spibusvar.h>
56 #include "spibus_if.h"
59 #define DBGPRINT(dev, fmt, args...) \
60 device_printf(dev, "%s: " fmt "\n", __func__, ## args)
62 #define DBGPRINT(dev, fmt, args...)
65 static struct resource_spec sfspi_spec[] = {
66 { SYS_RES_MEMORY, 0, RF_ACTIVE },
78 bus_space_handle_t bsh;
87 #define SFSPI_LOCK(sc) mtx_lock(&(sc)->mtx)
88 #define SFSPI_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
89 #define SFSPI_ASSERT_LOCKED(sc) mtx_assert(&(sc)->mtx, MA_OWNED);
90 #define SFSPI_ASSERT_UNLOCKED(sc) mtx_assert(&(sc)->mtx, MA_NOTOWNED);
94 * From Sifive-Unleashed-FU540-C000-v1.0.pdf page 101.
96 #define SFSPI_REG_SCKDIV 0x00 /* Serial clock divisor */
97 #define SFSPI_REG_SCKMODE 0x04 /* Serial clock mode */
98 #define SFSPI_REG_CSID 0x10 /* Chip select ID */
99 #define SFSPI_REG_CSDEF 0x14 /* Chip select default */
100 #define SFSPI_REG_CSMODE 0x18 /* Chip select mode */
101 #define SFSPI_REG_DELAY0 0x28 /* Delay control 0 */
102 #define SFSPI_REG_DELAY1 0x2C /* Delay control 1 */
103 #define SFSPI_REG_FMT 0x40 /* Frame format */
104 #define SFSPI_REG_TXDATA 0x48 /* Tx FIFO data */
105 #define SFSPI_REG_RXDATA 0x4C /* Rx FIFO data */
106 #define SFSPI_REG_TXMARK 0x50 /* Tx FIFO watermark */
107 #define SFSPI_REG_RXMARK 0x54 /* Rx FIFO watermark */
108 #define SFSPI_REG_FCTRL 0x60 /* SPI flash interface control* */
109 #define SFSPI_REG_FFMT 0x64 /* SPI flash instruction format* */
110 #define SFSPI_REG_IE 0x70 /* SPI interrupt enable */
111 #define SFSPI_REG_IP 0x74 /* SPI interrupt pending */
113 #define SFSPI_SCKDIV_MASK 0xfff
115 #define SFSPI_CSDEF_ALL ((1 << sc->cs_max)-1)
117 #define SFSPI_CSMODE_AUTO 0x0U
118 #define SFSPI_CSMODE_HOLD 0x2U
119 #define SFSPI_CSMODE_OFF 0x3U
121 #define SFSPI_TXDATA_DATA_MASK 0xff
122 #define SFSPI_TXDATA_FULL (1 << 31)
124 #define SFSPI_RXDATA_DATA_MASK 0xff
125 #define SFSPI_RXDATA_EMPTY (1 << 31)
127 #define SFSPI_SCKMODE_PHA (1 << 0)
128 #define SFSPI_SCKMODE_POL (1 << 1)
130 #define SFSPI_FMT_PROTO_SINGLE 0x0U
131 #define SFSPI_FMT_PROTO_DUAL 0x1U
132 #define SFSPI_FMT_PROTO_QUAD 0x2U
133 #define SFSPI_FMT_PROTO_MASK 0x3U
134 #define SFSPI_FMT_ENDIAN (1 << 2)
135 #define SFSPI_FMT_DIR (1 << 3)
136 #define SFSPI_FMT_LEN(x) ((uint32_t)(x) << 16)
137 #define SFSPI_FMT_LEN_MASK (0xfU << 16)
139 #define SFSPI_FIFO_DEPTH 8
141 #define SFSPI_READ(_sc, _reg) \
142 bus_space_read_4((_sc)->bst, (_sc)->bsh, (_reg))
143 #define SFSPI_WRITE(_sc, _reg, _val) \
144 bus_space_write_4((_sc)->bst, (_sc)->bsh, (_reg), (_val))
147 sfspi_tx(struct sfspi_softc *sc, uint8_t *buf, uint32_t bufsiz)
152 KASSERT(buf != NULL, ("TX buffer cannot be NULL"));
155 for (p = buf; p < end; p++) {
157 val = SFSPI_READ(sc, SFSPI_REG_TXDATA);
158 } while (val & SFSPI_TXDATA_FULL);
160 SFSPI_WRITE(sc, SFSPI_REG_TXDATA, val);
165 sfspi_rx(struct sfspi_softc *sc, uint8_t *buf, uint32_t bufsiz)
170 KASSERT(buf != NULL, ("RX buffer cannot be NULL"));
171 KASSERT(bufsiz <= SFSPI_FIFO_DEPTH,
172 ("Cannot receive more than %d bytes at a time\n",
176 for (p = buf; p < end; p++) {
178 val = SFSPI_READ(sc, SFSPI_REG_RXDATA);
179 } while (val & SFSPI_RXDATA_EMPTY);
180 *p = val & SFSPI_RXDATA_DATA_MASK;
185 sfspi_xfer_buf(struct sfspi_softc *sc, uint8_t *rxbuf, uint8_t *txbuf,
186 uint32_t txlen, uint32_t rxlen)
190 KASSERT(txlen == rxlen, ("TX and RX lengths must be equal"));
191 KASSERT(rxbuf != NULL, ("RX buffer cannot be NULL"));
192 KASSERT(txbuf != NULL, ("TX buffer cannot be NULL"));
195 bytes = (txlen > SFSPI_FIFO_DEPTH) ? SFSPI_FIFO_DEPTH : txlen;
196 sfspi_tx(sc, txbuf, bytes);
198 sfspi_rx(sc, rxbuf, bytes);
207 sfspi_setup(struct sfspi_softc *sc, uint32_t cs, uint32_t mode,
210 uint32_t csmode, fmt, sckdiv, sckmode;
212 SFSPI_ASSERT_LOCKED(sc);
215 * Fsck = Fin / 2 * (div + 1)
216 * -> div = Fin / (2 * Fsck) - 1
218 sckdiv = (howmany(sc->freq >> 1, freq) - 1) & SFSPI_SCKDIV_MASK;
219 SFSPI_WRITE(sc, SFSPI_REG_SCKDIV, sckdiv);
222 case SPIBUS_MODE_NONE:
225 case SPIBUS_MODE_CPHA:
226 sckmode = SFSPI_SCKMODE_PHA;
228 case SPIBUS_MODE_CPOL:
229 sckmode = SFSPI_SCKMODE_POL;
231 case SPIBUS_MODE_CPOL_CPHA:
232 sckmode = SFSPI_SCKMODE_PHA | SFSPI_SCKMODE_POL;
237 SFSPI_WRITE(sc, SFSPI_REG_SCKMODE, sckmode);
239 csmode = SFSPI_CSMODE_HOLD;
240 if (cs & SPIBUS_CS_HIGH)
241 csmode = SFSPI_CSMODE_AUTO;
242 SFSPI_WRITE(sc, SFSPI_REG_CSMODE, csmode);
244 SFSPI_WRITE(sc, SFSPI_REG_CSID, cs & ~SPIBUS_CS_HIGH);
246 fmt = SFSPI_FMT_PROTO_SINGLE | SFSPI_FMT_LEN(8);
247 SFSPI_WRITE(sc, SFSPI_REG_FMT, fmt);
253 sfspi_transfer(device_t dev, device_t child, struct spi_command *cmd)
255 struct sfspi_softc *sc;
256 uint32_t clock, cs, csdef, mode;
259 KASSERT(cmd->tx_cmd_sz == cmd->rx_cmd_sz,
260 ("TX and RX command sizes must be equal"));
261 KASSERT(cmd->tx_data_sz == cmd->rx_data_sz,
262 ("TX and RX data sizes must be equal"));
264 sc = device_get_softc(dev);
265 spibus_get_cs(child, &cs);
266 spibus_get_clock(child, &clock);
267 spibus_get_mode(child, &mode);
269 if (cs > sc->cs_max) {
270 device_printf(sc->dev, "Invalid chip select %u\n", cs);
275 device_busy(sc->dev);
277 err = sfspi_setup(sc, cs, mode, clock);
284 if (cmd->tx_cmd_sz > 0)
285 err = sfspi_xfer_buf(sc, cmd->rx_cmd, cmd->tx_cmd,
286 cmd->tx_cmd_sz, cmd->rx_cmd_sz);
287 if (cmd->tx_data_sz > 0 && err == 0)
288 err = sfspi_xfer_buf(sc, cmd->rx_data, cmd->tx_data,
289 cmd->tx_data_sz, cmd->rx_data_sz);
291 /* Deassert chip select. */
292 csdef = SFSPI_CSDEF_ALL & ~(1 << cs);
293 SFSPI_WRITE(sc, SFSPI_REG_CSDEF, csdef);
294 SFSPI_WRITE(sc, SFSPI_REG_CSDEF, SFSPI_CSDEF_ALL);
296 device_unbusy(sc->dev);
303 sfspi_attach(device_t dev)
305 struct sfspi_softc *sc;
308 sc = device_get_softc(dev);
311 mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF);
313 error = bus_alloc_resources(dev, sfspi_spec, &sc->res);
315 device_printf(dev, "Couldn't allocate resources\n");
318 sc->bst = rman_get_bustag(sc->res);
319 sc->bsh = rman_get_bushandle(sc->res);
321 error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk);
323 device_printf(dev, "Couldn't allocate clock: %d\n", error);
326 error = clk_enable(sc->clk);
328 device_printf(dev, "Couldn't enable clock: %d\n", error);
332 error = clk_get_freq(sc->clk, &sc->freq);
334 device_printf(sc->dev, "Couldn't get frequency: %d\n", error);
339 * From Sifive-Unleashed-FU540-C000-v1.0.pdf page 103:
340 * csdef is cs_width bits wide and all ones on reset.
342 sc->cs_max = SFSPI_READ(sc, SFSPI_REG_CSDEF);
345 * We don't support the direct-mapped flash interface.
348 SFSPI_WRITE(sc, SFSPI_REG_FCTRL, 0x0);
350 /* Probe and attach the spibus when interrupts are available. */
351 sc->parent = device_add_child(dev, "spibus", -1);
352 config_intrhook_oneshot((ich_func_t)bus_generic_attach, dev);
357 bus_release_resources(dev, sfspi_spec, &sc->res);
358 mtx_destroy(&sc->mtx);
363 sfspi_probe(device_t dev)
366 if (!ofw_bus_status_okay(dev))
369 if (!ofw_bus_is_compatible(dev, "sifive,spi0"))
372 device_set_desc(dev, "SiFive SPI controller");
374 return (BUS_PROBE_DEFAULT);
378 sfspi_get_node(device_t bus, device_t dev)
381 return (ofw_bus_get_node(bus));
384 static device_method_t sfspi_methods[] = {
385 DEVMETHOD(device_probe, sfspi_probe),
386 DEVMETHOD(device_attach, sfspi_attach),
388 DEVMETHOD(spibus_transfer, sfspi_transfer),
390 DEVMETHOD(ofw_bus_get_node, sfspi_get_node),
395 static driver_t sfspi_driver = {
398 sizeof(struct sfspi_softc)
401 static devclass_t sfspi_devclass;
403 DRIVER_MODULE(sifive_spi, simplebus, sfspi_driver, sfspi_devclass, 0, 0);
404 DRIVER_MODULE(ofw_spibus, sifive_spi, ofw_spibus_driver, ofw_spibus_devclass, 0, 0);
405 MODULE_DEPEND(sifive_spi, ofw_spibus, 1, 1, 1);