2  * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
9  * SPDX-License-Identifier:	GPL-2.0+
60  * driver. Platform can configure number of CS using CONFIG_SYS_SPI0_NUM_CS
61  * if more than one CS is supported and by defining CONFIG_SYS_SPI0.
70  * define CONFIG_SYS_SPI1 when platform has spi-1 device (bus #1) and
71  * CONFIG_SYS_SPI1_NUM_CS defines number of CS on this bus
80  * define CONFIG_SYS_SPI2 when platform has spi-2 device (bus #2) and
81  * CONFIG_SYS_SPI2_NUM_CS defines number of CS on this bus
128 	u8 num_cs;	   /* total no. of CS available */
129 	u8 cur_cs;	   /* CS of current slave */
130 	bool half_duplex;  /* true, if master is half-duplex only */
143 	/* send out data */  in davinci_spi_xfer_data()
144 	writel(data, &ds->regs->dat1);  in davinci_spi_xfer_data()
146 	/* wait for the data to clock in/out */  in davinci_spi_xfer_data()
147 	while ((buf_reg_val = readl(&ds->regs->buf)) & SPIBUF_RXEMPTY_MASK)  in davinci_spi_xfer_data()
158 	/* enable CS hold, CS[n] and clear the data bits */  in davinci_spi_read()
160 			 (ds->cur_cs << SPIDAT1_CSNR_SHIFT));  in davinci_spi_read()
163 	while (readl(&ds->regs->buf) & SPIBUF_TXFULL_MASK)  in davinci_spi_read()
167 	writel(data1_reg_val, &ds->regs->dat1);  in davinci_spi_read()
170 	while ((len--) > 1)  in davinci_spi_read()
173 	/* clear CS hold when we reach the end */  in davinci_spi_read()
188 	/* enable CS hold and clear the data bits */  in davinci_spi_write()
190 			 (ds->cur_cs << SPIDAT1_CSNR_SHIFT));  in davinci_spi_write()
193 	while (readl(&ds->regs->buf) & SPIBUF_TXFULL_MASK)  in davinci_spi_write()
198 		writel(data1_reg_val | *txp++, &ds->regs->dat1);  in davinci_spi_write()
199 		len--;  in davinci_spi_write()
203 	while ((len--) > 1)  in davinci_spi_write()
206 	/* clear CS hold when we reach the end */  in davinci_spi_write()
222 	/* enable CS hold and clear the data bits */  in davinci_spi_read_write()
224 			 (ds->cur_cs << SPIDAT1_CSNR_SHIFT));  in davinci_spi_read_write()
227 	while (readl(&ds->regs->buf) & SPIBUF_TXFULL_MASK)  in davinci_spi_read_write()
231 	while ((len--) > 1)  in davinci_spi_read_write()
234 	/* clear CS hold when we reach the end */  in davinci_spi_read_write()
245 static int __davinci_spi_claim_bus(struct davinci_spi_slave *ds, int cs)  in __davinci_spi_claim_bus()  argument
250 	writel(SPIGCR0_SPIRST_MASK, &ds->regs->gcr0);  in __davinci_spi_claim_bus()
252 	writel(SPIGCR0_SPIENA_MASK, &ds->regs->gcr0);  in __davinci_spi_claim_bus()
255 	writel(SPIGCR1_MASTER_MASK | SPIGCR1_CLKMOD_MASK, &ds->regs->gcr1);  in __davinci_spi_claim_bus()
257 	/* CS, CLK, SIMO and SOMI are functional pins */  in __davinci_spi_claim_bus()
258 	writel(((1 << cs) | SPIPC0_CLKFUN_MASK |  in __davinci_spi_claim_bus()
259 		SPIPC0_DOFUN_MASK | SPIPC0_DIFUN_MASK), &ds->regs->pc0);  in __davinci_spi_claim_bus()
262 	scalar = ((CONFIG_SYS_SPI_CLK / ds->freq) - 1) & 0xFF;  in __davinci_spi_claim_bus()
267 	 *   MSB shifted out first  in __davinci_spi_claim_bus()
269 	if (ds->mode & SPI_CPOL)  in __davinci_spi_claim_bus()
271 	if (!(ds->mode & SPI_CPHA))  in __davinci_spi_claim_bus()
274 		(mode << SPIFMT_PHASE_SHIFT), &ds->regs->fmt0);  in __davinci_spi_claim_bus()
281 		(50 << SPI_T2CDELAY_SHIFT), &ds->regs->delay);  in __davinci_spi_claim_bus()
284 	writel(SPIDEF_CSDEF0_MASK, &ds->regs->def);  in __davinci_spi_claim_bus()
287 	writel(0, &ds->regs->int0);  in __davinci_spi_claim_bus()
288 	writel(0, &ds->regs->lvl);  in __davinci_spi_claim_bus()
291 	writel((readl(&ds->regs->gcr1) | SPIGCR1_SPIENA_MASK), &ds->regs->gcr1);  in __davinci_spi_claim_bus()
299 	writel(SPIGCR0_SPIRST_MASK, &ds->regs->gcr0);  in __davinci_spi_release_bus()
312 		goto out;  in __davinci_spi_xfer()
315 	 * It's not clear how non-8-bit-aligned transfers are supposed to be  in __davinci_spi_xfer()
317 	 * the current SPI interface - here we terminate on receiving such a  in __davinci_spi_xfer()
323 		goto out;  in __davinci_spi_xfer()
332 	if (!ds->half_duplex)  in __davinci_spi_xfer()
338 out:  in __davinci_spi_xfer()
353 int spi_cs_is_valid(unsigned int bus, unsigned int cs)  in spi_cs_is_valid()  argument
359 		if (cs < SPI0_NUM_CS)  in spi_cs_is_valid()
364 		if (cs < SPI1_NUM_CS)  in spi_cs_is_valid()
370 		if (cs < SPI2_NUM_CS)  in spi_cs_is_valid()
396 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,  in spi_setup_slave()  argument
401 	if (!spi_cs_is_valid(bus, cs))  in spi_setup_slave()
404 	ds = spi_alloc_slave(struct davinci_spi_slave, bus, cs);  in spi_setup_slave()
410 		ds->regs = (struct davinci_spi_regs *)SPI0_BASE;  in spi_setup_slave()
414 		ds->regs = (struct davinci_spi_regs *)SPI1_BASE;  in spi_setup_slave()
419 		ds->regs = (struct davinci_spi_regs *)SPI2_BASE;  in spi_setup_slave()
426 	ds->freq = max_hz;  in spi_setup_slave()
427 	ds->mode = mode;  in spi_setup_slave()
429 	return &ds->slave;  in spi_setup_slave()
444 	ds->cur_cs = slave->cs;  in spi_xfer()
454 	ds->half_duplex = true;  in spi_claim_bus()
456 	ds->half_duplex = false;  in spi_claim_bus()
458 	return __davinci_spi_claim_bus(ds, ds->slave.cs);  in spi_claim_bus()
475 		return -EINVAL;  in davinci_spi_set_speed()
477 	ds->freq = max_hz;  in davinci_spi_set_speed()
487 	ds->mode = mode;  in davinci_spi_set_mode()
496 	struct udevice *bus = dev->parent;  in davinci_spi_claim_bus()
499 	if (slave_plat->cs >= ds->num_cs) {  in davinci_spi_claim_bus()
501 		return -EINVAL;  in davinci_spi_claim_bus()
503 	ds->half_duplex = slave_plat->mode & SPI_PREAMBLE;  in davinci_spi_claim_bus()
505 	return __davinci_spi_claim_bus(ds, slave_plat->cs);  in davinci_spi_claim_bus()
510 	struct davinci_spi_slave *ds = dev_get_priv(dev->parent);  in davinci_spi_release_bus()
521 	struct udevice *bus = dev->parent;  in davinci_spi_xfer()
524 	if (slave->cs >= ds->num_cs) {  in davinci_spi_xfer()
526 		return -EINVAL;  in davinci_spi_xfer()
528 	ds->cur_cs = slave->cs;  in davinci_spi_xfer()
542 	const void *blob = gd->fdt_blob;  in davinci_ofdata_to_platadata()
545 	ds->regs = devfdt_map_physmem(bus, sizeof(struct davinci_spi_regs));  in davinci_ofdata_to_platadata()
546 	if (!ds->regs) {  in davinci_ofdata_to_platadata()
548 		return -EINVAL;  in davinci_ofdata_to_platadata()
550 	ds->num_cs = fdtdec_get_int(blob, node, "num-cs", 4);  in davinci_ofdata_to_platadata()
564 	{ .compatible = "ti,keystone-spi" },
565 	{ .compatible = "ti,dm6441-spi" },
566 	{ .compatible = "ti,da830-spi" },