11  * Copyright (C) 2005 David Brownell (ported to 2.6 SPI interface)
34 #include <linux/delay.h>
42 #include <linux/spi/spi.h>
43 #include <linux/spi/spi_bitbang.h>
47 #include <asm/mach-types.h>
48 #include <linux/soc/ti/omap1-io.h>
49 #include <linux/soc/ti/omap1-soc.h>
50 #include <linux/soc/ti/omap1-mux.h>
115 static inline void omap_uwire_configure_mode(u8 cs, unsigned long flags)  in omap_uwire_configure_mode()  argument
123 	if (cs & 1)  in omap_uwire_configure_mode()
127 	if (cs <= 1)  in omap_uwire_configure_mode()
152 			return -1;  in wait_uwire_csr_flag()
171 static void uwire_chipselect(struct spi_device *spi, int value)  in uwire_chipselect()  argument
173 	struct	uwire_state *ust = spi->controller_state;  in uwire_chipselect()
182 	if (value == BITBANG_CS_INACTIVE || old_cs != spi_get_chipselect(spi, 0)) {  in uwire_chipselect()
183 		/* Deselect this CS, or the previous CS */  in uwire_chipselect()
189 		uwire_set_clk1_div(ust->div1_idx);  in uwire_chipselect()
191 		if (spi->mode & SPI_CPOL)  in uwire_chipselect()
196 		w = spi_get_chipselect(spi, 0) << 10;  in uwire_chipselect()
202 static int uwire_txrx(struct spi_device *spi, struct spi_transfer *t)  in uwire_txrx()  argument
204 	unsigned	len = t->len;  in uwire_txrx()
205 	unsigned	bits = t->bits_per_word;  in uwire_txrx()
210 	if (!t->tx_buf && !t->rx_buf)  in uwire_txrx()
213 	w = spi_get_chipselect(spi, 0) << 10;  in uwire_txrx()
216 	if (t->tx_buf) {  in uwire_txrx()
217 		const u8	*buf = t->tx_buf;  in uwire_txrx()
224 			 * (msb-first) on the way out from memory.  in uwire_txrx()
232 			val <<= 16 - bits;  in uwire_txrx()
235 			pr_debug("%s: write-%d =%04x\n",  in uwire_txrx()
236 					dev_name(&spi->dev), bits, val);  in uwire_txrx()
247 			len -= bytes;  in uwire_txrx()
263 	} else if (t->rx_buf) {  in uwire_txrx()
264 		u8		*buf = t->rx_buf;  in uwire_txrx()
276 			len -= bytes;  in uwire_txrx()
289 			val &= (1 << bits) - 1;  in uwire_txrx()
295 			pr_debug("%s: read-%d =%04x\n",  in uwire_txrx()
296 					dev_name(&spi->dev), bits, val);  in uwire_txrx()
303 	return -EIO;  in uwire_txrx()
306 static int uwire_setup_transfer(struct spi_device *spi, struct spi_transfer *t)  in uwire_setup_transfer()  argument
308 	struct uwire_state	*ust = spi->controller_state;  in uwire_setup_transfer()
318 	uwire = spi_controller_get_devdata(spi->controller);  in uwire_setup_transfer()
324 	if (spi->mode & SPI_CS_HIGH)  in uwire_setup_transfer()
327 	if (spi->mode & SPI_CPOL)  in uwire_setup_transfer()
330 	switch (spi->mode & SPI_MODE_X_MASK) {  in uwire_setup_transfer()
342 	rate = clk_get_rate(uwire->ck);  in uwire_setup_transfer()
345 		hz = t->speed_hz;  in uwire_setup_transfer()
347 		hz = spi->max_speed_hz;  in uwire_setup_transfer()
350 		pr_debug("%s: zero speed?\n", dev_name(&spi->dev));  in uwire_setup_transfer()
351 		status = -EINVAL;  in uwire_setup_transfer()
372 		div2 = (rate / div1 + hz - 1) / hz;  in uwire_setup_transfer()
378 			dev_name(&spi->dev), rate / 10 / 8, hz);  in uwire_setup_transfer()
379 		status = -EDOM;  in uwire_setup_transfer()
386 	ust->div1_idx = div1_idx;  in uwire_setup_transfer()
411 	omap_uwire_configure_mode(spi_get_chipselect(spi, 0), flags);  in uwire_setup_transfer()
412 	pr_debug("%s: uwire flags %02x, armxor %lu KHz, SCK %lu KHz\n",  in uwire_setup_transfer()
414 			clk_get_rate(uwire->ck) / 1000,  in uwire_setup_transfer()
421 static int uwire_setup(struct spi_device *spi)  in uwire_setup()  argument
423 	struct uwire_state *ust = spi->controller_state;  in uwire_setup()
430 			return -ENOMEM;  in uwire_setup()
431 		spi->controller_state = ust;  in uwire_setup()
435 	status = uwire_setup_transfer(spi, NULL);  in uwire_setup()
442 static void uwire_cleanup(struct spi_device *spi)  in uwire_cleanup()  argument
444 	kfree(spi->controller_state);  in uwire_cleanup()
450 	clk_disable_unprepare(uwire->ck);  in uwire_off()
451 	spi_controller_put(uwire->bitbang.ctlr);  in uwire_off()
460 	host = spi_alloc_host(&pdev->dev, sizeof(*uwire));  in uwire_probe()
462 		return -ENODEV;  in uwire_probe()
466 	uwire_base = devm_ioremap(&pdev->dev, UWIRE_BASE_PHYS, UWIRE_IO_SIZE);  in uwire_probe()
468 		dev_dbg(&pdev->dev, "can't ioremap UWIRE\n");  in uwire_probe()
470 		return -ENOMEM;  in uwire_probe()
475 	uwire->ck = devm_clk_get(&pdev->dev, "fck");  in uwire_probe()
476 	if (IS_ERR(uwire->ck)) {  in uwire_probe()
477 		status = PTR_ERR(uwire->ck);  in uwire_probe()
478 		dev_dbg(&pdev->dev, "no functional clock?\n");  in uwire_probe()
482 	clk_prepare_enable(uwire->ck);  in uwire_probe()
486 	/* the spi->mode bits understood by this driver: */  in uwire_probe()
487 	host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;  in uwire_probe()
488 	host->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);  in uwire_probe()
489 	host->flags = SPI_CONTROLLER_HALF_DUPLEX;  in uwire_probe()
491 	host->bus_num = 2;	/* "official" */  in uwire_probe()
492 	host->num_chipselect = 4;  in uwire_probe()
493 	host->setup = uwire_setup;  in uwire_probe()
494 	host->cleanup = uwire_cleanup;  in uwire_probe()
496 	uwire->bitbang.ctlr = host;  in uwire_probe()
497 	uwire->bitbang.chipselect = uwire_chipselect;  in uwire_probe()
498 	uwire->bitbang.setup_transfer = uwire_setup_transfer;  in uwire_probe()
499 	uwire->bitbang.txrx_bufs = uwire_txrx;  in uwire_probe()
501 	status = spi_bitbang_start(&uwire->bitbang);  in uwire_probe()
514 	spi_bitbang_stop(&uwire->bitbang);  in uwire_remove()