38 #include <linux/clk.h>
48 #include <asm/mach-types.h>
93 	struct clk		*ck;
155 			return -1;  in wait_uwire_csr_flag()
176 	struct	uwire_state *ust = spi->controller_state;  in uwire_chipselect()
185 	if (value == BITBANG_CS_INACTIVE || old_cs != spi->chip_select) {  in uwire_chipselect()
192 		uwire_set_clk1_div(ust->div1_idx);  in uwire_chipselect()
194 		if (spi->mode & SPI_CPOL)  in uwire_chipselect()
199 		w = spi->chip_select << 10;  in uwire_chipselect()
207 	unsigned	len = t->len;  in uwire_txrx()
208 	unsigned	bits = t->bits_per_word;  in uwire_txrx()
213 	if (!t->tx_buf && !t->rx_buf)  in uwire_txrx()
216 	w = spi->chip_select << 10;  in uwire_txrx()
219 	if (t->tx_buf) {  in uwire_txrx()
220 		const u8	*buf = t->tx_buf;  in uwire_txrx()
222 		/* NOTE:  DMA could be used for TX transfers */  in uwire_txrx()
226 			/* tx bit 15 is first sent; we byteswap multibyte words  in uwire_txrx()
227 			 * (msb-first) on the way out from memory.  in uwire_txrx()
235 			val <<= 16 - bits;  in uwire_txrx()
238 			pr_debug("%s: write-%d =%04x\n",  in uwire_txrx()
239 					dev_name(&spi->dev), bits, val);  in uwire_txrx()
250 			len -= bytes;  in uwire_txrx()
266 	} else if (t->rx_buf) {  in uwire_txrx()
267 		u8		*buf = t->rx_buf;  in uwire_txrx()
279 			len -= bytes;  in uwire_txrx()
292 			val &= (1 << bits) - 1;  in uwire_txrx()
298 			pr_debug("%s: read-%d =%04x\n",  in uwire_txrx()
299 					dev_name(&spi->dev), bits, val);  in uwire_txrx()
306 	return -EIO;  in uwire_txrx()
311 	struct uwire_state	*ust = spi->controller_state;  in uwire_setup_transfer()
321 	uwire = spi_master_get_devdata(spi->master);  in uwire_setup_transfer()
323 	/* mode 0..3, clock inverted separately;  in uwire_setup_transfer()
327 	if (spi->mode & SPI_CS_HIGH)  in uwire_setup_transfer()
330 	if (spi->mode & SPI_CPOL)  in uwire_setup_transfer()
333 	switch (spi->mode & (SPI_CPOL | SPI_CPHA)) {  in uwire_setup_transfer()
345 	rate = clk_get_rate(uwire->ck);  in uwire_setup_transfer()
348 		hz = t->speed_hz;  in uwire_setup_transfer()
350 		hz = spi->max_speed_hz;  in uwire_setup_transfer()
353 		pr_debug("%s: zero speed?\n", dev_name(&spi->dev));  in uwire_setup_transfer()
354 		status = -EINVAL;  in uwire_setup_transfer()
375 		div2 = (rate / div1 + hz - 1) / hz;  in uwire_setup_transfer()
381 			dev_name(&spi->dev), rate / 10 / 8, hz);  in uwire_setup_transfer()
382 		status = -EDOM;  in uwire_setup_transfer()
389 	ust->div1_idx = div1_idx;  in uwire_setup_transfer()
414 	omap_uwire_configure_mode(spi->chip_select, flags);  in uwire_setup_transfer()
417 			clk_get_rate(uwire->ck) / 1000,  in uwire_setup_transfer()
418 			rate / 1000);  in uwire_setup_transfer()
426 	struct uwire_state *ust = spi->controller_state;  in uwire_setup()
433 			return -ENOMEM;  in uwire_setup()
434 		spi->controller_state = ust;  in uwire_setup()
447 	kfree(spi->controller_state);  in uwire_cleanup()
453 	clk_disable_unprepare(uwire->ck);  in uwire_off()
454 	spi_master_put(uwire->bitbang.master);  in uwire_off()
463 	master = spi_alloc_master(&pdev->dev, sizeof *uwire);  in uwire_probe()
465 		return -ENODEV;  in uwire_probe()
469 	uwire_base = devm_ioremap(&pdev->dev, UWIRE_BASE_PHYS, UWIRE_IO_SIZE);  in uwire_probe()
471 		dev_dbg(&pdev->dev, "can't ioremap UWIRE\n");  in uwire_probe()
473 		return -ENOMEM;  in uwire_probe()
478 	uwire->ck = devm_clk_get(&pdev->dev, "fck");  in uwire_probe()
479 	if (IS_ERR(uwire->ck)) {  in uwire_probe()
480 		status = PTR_ERR(uwire->ck);  in uwire_probe()
481 		dev_dbg(&pdev->dev, "no functional clock?\n");  in uwire_probe()
485 	clk_prepare_enable(uwire->ck);  in uwire_probe()
494 	/* the spi->mode bits understood by this driver: */  in uwire_probe()
495 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;  in uwire_probe()
496 	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);  in uwire_probe()
497 	master->flags = SPI_MASTER_HALF_DUPLEX;  in uwire_probe()
499 	master->bus_num = 2;	/* "official" */  in uwire_probe()
500 	master->num_chipselect = 4;  in uwire_probe()
501 	master->setup = uwire_setup;  in uwire_probe()
502 	master->cleanup = uwire_cleanup;  in uwire_probe()
504 	uwire->bitbang.master = master;  in uwire_probe()
505 	uwire->bitbang.chipselect = uwire_chipselect;  in uwire_probe()
506 	uwire->bitbang.setup_transfer = uwire_setup_transfer;  in uwire_probe()
507 	uwire->bitbang.txrx_bufs = uwire_txrx;  in uwire_probe()
509 	status = spi_bitbang_start(&uwire->bitbang);  in uwire_probe()
522 	spi_bitbang_stop(&uwire->bitbang);  in uwire_remove()