9  * Based on linux spi driver. Original copyright follows:
10  * linux/drivers/spi/spi-sun4i.c
12  * Copyright (C) 2012 - 2014 Allwinner Tech
16  * Maxime Ripard <maxime.ripard@free-electrons.com>
18  * SPDX-License-Identifier:	GPL-2.0+
24 #include <spi.h>
38 /* sun4i spi registers */
47 /* sun6i spi registers */
59 /* sun spi bits */
77 #define SPI_REG(priv, reg)		((priv)->base + \
78 					(priv)->variant->regs[reg])
79 #define SPI_BIT(priv, bit)		((priv)->variant->bits[bit])
83 /* sun spi register set */
97 /* sun spi register bits */
144 	while (len--) {  in sun4i_spi_drain_fifo()
146 		if (priv->rx_buf)  in sun4i_spi_drain_fifo()
147 			*priv->rx_buf++ = byte;  in sun4i_spi_drain_fifo()
155 	while (len--) {  in sun4i_spi_fill_fifo()
156 		byte = priv->tx_buf ? *priv->tx_buf++ : 0;  in sun4i_spi_fill_fifo()
181 	const void *fdt = gd->fdt_blob;  in sun4i_spi_parse_pins()
189 	list = fdt_getprop(fdt, dev_of_offset(dev), "pinctrl-0", &size);  in sun4i_spi_parse_pins()
191 		printf("WARNING: sun4i_spi: cannot find pinctrl-0 node\n");  in sun4i_spi_parse_pins()
192 		return -EINVAL;  in sun4i_spi_parse_pins()
197 		size -= sizeof(*list);  in sun4i_spi_parse_pins()
204 						     "drive-strength", 0);  in sun4i_spi_parse_pins()
221 		if (fdt_get_property(fdt, offset, "bias-disable", NULL))  in sun4i_spi_parse_pins()
223 		else if (fdt_get_property(fdt, offset, "bias-pull-up", NULL))  in sun4i_spi_parse_pins()
225 		else if (fdt_get_property(fdt, offset, "bias-pull-down", NULL))  in sun4i_spi_parse_pins()
265 		clk_disable(&priv->clk_ahb);  in sun4i_spi_set_clock()
266 		clk_disable(&priv->clk_mod);  in sun4i_spi_set_clock()
267 		if (reset_valid(&priv->reset))  in sun4i_spi_set_clock()
268 			reset_assert(&priv->reset);  in sun4i_spi_set_clock()
272 	ret = clk_enable(&priv->clk_ahb);  in sun4i_spi_set_clock()
278 	ret = clk_enable(&priv->clk_mod);  in sun4i_spi_set_clock()
284 	if (reset_valid(&priv->reset)) {  in sun4i_spi_set_clock()
285 		ret = reset_deassert(&priv->reset);  in sun4i_spi_set_clock()
295 	clk_disable(&priv->clk_mod);  in sun4i_spi_set_clock()
297 	clk_disable(&priv->clk_ahb);  in sun4i_spi_set_clock()
303 	struct sun4i_spi_priv *priv = dev_get_priv(dev->parent);  in sun4i_spi_claim_bus()
306 	ret = sun4i_spi_set_clock(dev->parent, true);  in sun4i_spi_claim_bus()
313 	if (priv->variant->has_soft_reset)  in sun4i_spi_claim_bus()
325 	struct sun4i_spi_priv *priv = dev_get_priv(dev->parent);  in sun4i_spi_release_bus()
329 	sun4i_spi_set_clock(dev->parent, false);  in sun4i_spi_release_bus()
337 	struct udevice *bus = dev->parent;  in sun4i_spi_xfer()
346 	priv->tx_buf = dout;  in sun4i_spi_xfer()
347 	priv->rx_buf = din;  in sun4i_spi_xfer()
350 		debug("%s: non byte-aligned SPI transfer.\n", __func__);  in sun4i_spi_xfer()
351 		return -ENAVAIL;  in sun4i_spi_xfer()
355 		sun4i_spi_set_cs(bus, slave_plat->cs, true);  in sun4i_spi_xfer()
363 		nbytes = min(len, (priv->variant->fifo_depth - 1));  in sun4i_spi_xfer()
369 		if (priv->variant->has_burst_ctl)  in sun4i_spi_xfer()
389 			sun4i_spi_set_cs(bus, slave_plat->cs, false);  in sun4i_spi_xfer()
396 		len -= nbytes;  in sun4i_spi_xfer()
400 		sun4i_spi_set_cs(bus, slave_plat->cs, false);  in sun4i_spi_xfer()
412 	if (speed > plat->max_hz)  in sun4i_spi_set_speed()
413 		speed = plat->max_hz;  in sun4i_spi_set_speed()
437 			div--;  in sun4i_spi_set_speed()
442 		div = __ilog2(SUN4I_SPI_MAX_RATE) - __ilog2(speed);  in sun4i_spi_set_speed()
447 	priv->freq = speed;  in sun4i_spi_set_speed()
467 	priv->mode = mode;  in sun4i_spi_set_mode()
487 	ret = clk_get_by_name(bus, "ahb", &priv->clk_ahb);  in sun4i_spi_probe()
493 	ret = clk_get_by_name(bus, "mod", &priv->clk_mod);  in sun4i_spi_probe()
499 	ret = reset_get_by_index(bus, 0, &priv->reset);  in sun4i_spi_probe()
500 	if (ret && ret != -ENOENT) {  in sun4i_spi_probe()
507 	priv->variant = plat->variant;  in sun4i_spi_probe()
508 	priv->base = plat->base;  in sun4i_spi_probe()
509 	priv->freq = plat->max_hz;  in sun4i_spi_probe()
519 	plat->base = devfdt_get_addr(bus);  in sun4i_spi_ofdata_to_platdata()
520 	plat->variant = (struct sun4i_spi_variant *)dev_get_driver_data(bus);  in sun4i_spi_ofdata_to_platdata()
521 	plat->max_hz = fdtdec_get_int(gd->fdt_blob, node,  in sun4i_spi_ofdata_to_platdata()
522 				      "spi-max-frequency",  in sun4i_spi_ofdata_to_platdata()
525 	if (plat->max_hz > SUN4I_SPI_MAX_RATE)  in sun4i_spi_ofdata_to_platdata()
526 		plat->max_hz = SUN4I_SPI_MAX_RATE;  in sun4i_spi_ofdata_to_platdata()
611 	  .compatible = "allwinner,sun4i-a10-spi",
615 	  .compatible = "allwinner,sun6i-a31-spi",
619 	  .compatible = "allwinner,sun8i-h3-spi",