1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
80 	uint64_t		freq;  member
84 #define	SFSPI_LOCK(sc)			mtx_lock(&(sc)->mtx)
85 #define	SFSPI_UNLOCK(sc)		mtx_unlock(&(sc)->mtx)
86 #define	SFSPI_ASSERT_LOCKED(sc)		mtx_assert(&(sc)->mtx, MA_OWNED);
87 #define	SFSPI_ASSERT_UNLOCKED(sc)	mtx_assert(&(sc)->mtx, MA_NOTOWNED);
91  * From Sifive-Unleashed-FU540-C000-v1.0.pdf page 101.
95 #define	SFSPI_REG_CSID		0x10 /* Chip select ID */
96 #define	SFSPI_REG_CSDEF		0x14 /* Chip select default */
97 #define	SFSPI_REG_CSMODE	0x18 /* Chip select mode */
112 #define	SFSPI_CSDEF_ALL		((1 << sc->cs_max)-1)
139     bus_space_read_4((_sc)->bst, (_sc)->bsh, (_reg))
141     bus_space_write_4((_sc)->bst, (_sc)->bsh, (_reg), (_val))
197 		txlen -= bytes;  in sfspi_xfer_buf()
205     uint32_t freq)  in sfspi_setup()  argument
213 	 * -> div = Fin / (2 * Fsck) - 1  in sfspi_setup()
215 	sckdiv = (howmany(sc->freq >> 1, freq) - 1) & SFSPI_SCKDIV_MASK;  in sfspi_setup()
218 	switch (mode) {  in sfspi_setup()
256 	KASSERT(cmd->tx_cmd_sz == cmd->rx_cmd_sz,  in sfspi_transfer()
258 	KASSERT(cmd->tx_data_sz == cmd->rx_data_sz,  in sfspi_transfer()
266 	if (cs > sc->cs_max) {  in sfspi_transfer()
267 		device_printf(sc->dev, "Invalid chip select %u\n", cs);  in sfspi_transfer()
272 	device_busy(sc->dev);  in sfspi_transfer()
281 	if (cmd->tx_cmd_sz > 0)  in sfspi_transfer()
282 		err = sfspi_xfer_buf(sc, cmd->rx_cmd, cmd->tx_cmd,  in sfspi_transfer()
283 		    cmd->tx_cmd_sz, cmd->rx_cmd_sz);  in sfspi_transfer()
284 	if (cmd->tx_data_sz > 0 && err == 0)  in sfspi_transfer()
285 		err = sfspi_xfer_buf(sc, cmd->rx_data, cmd->tx_data,  in sfspi_transfer()
286 		    cmd->tx_data_sz, cmd->rx_data_sz);  in sfspi_transfer()
288 	/* Deassert chip select. */  in sfspi_transfer()
293 	device_unbusy(sc->dev);  in sfspi_transfer()
306 	sc->dev = dev;  in sfspi_attach()
308 	mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF);  in sfspi_attach()
310 	error = bus_alloc_resources(dev, sfspi_spec, &sc->res);  in sfspi_attach()
315 	sc->bst = rman_get_bustag(sc->res);  in sfspi_attach()
316 	sc->bsh = rman_get_bushandle(sc->res);  in sfspi_attach()
318 	error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk);  in sfspi_attach()
323 	error = clk_enable(sc->clk);  in sfspi_attach()
329 	error = clk_get_freq(sc->clk, &sc->freq);  in sfspi_attach()
331 		device_printf(sc->dev, "Couldn't get frequency: %d\n", error);  in sfspi_attach()
336 	 * From Sifive-Unleashed-FU540-C000-v1.0.pdf page 103:  in sfspi_attach()
339 	sc->cs_max = SFSPI_READ(sc, SFSPI_REG_CSDEF);  in sfspi_attach()
342 	 * We don't support the direct-mapped flash interface.  in sfspi_attach()
348 	sc->parent = device_add_child(dev, "spibus", DEVICE_UNIT_ANY);  in sfspi_attach()
354 	bus_release_resources(dev, sfspi_spec, &sc->res);  in sfspi_attach()
355 	mtx_destroy(&sc->mtx);  in sfspi_attach()