56 struct spi_st {  struct
71 static int spi_st_clk_enable(struct spi_st *spi_st)  in spi_st_clk_enable()  argument
81 	return clk_prepare_enable(spi_st->clk);  in spi_st_clk_enable()
84 static void spi_st_clk_disable(struct spi_st *spi_st)  in spi_st_clk_disable()  argument
94 	clk_disable_unprepare(spi_st->clk);  in spi_st_clk_disable()
98 static void ssc_write_tx_fifo(struct spi_st *spi_st)  in ssc_write_tx_fifo()  argument
103 	if (spi_st->words_remaining > FIFO_SIZE)  in ssc_write_tx_fifo()
106 		count = spi_st->words_remaining;  in ssc_write_tx_fifo()
109 		if (spi_st->tx_ptr) {  in ssc_write_tx_fifo()
110 			if (spi_st->bytes_per_word == 1) {  in ssc_write_tx_fifo()
111 				word = *spi_st->tx_ptr++;  in ssc_write_tx_fifo()
113 				word = *spi_st->tx_ptr++;  in ssc_write_tx_fifo()
114 				word = *spi_st->tx_ptr++ | (word << 8);  in ssc_write_tx_fifo()
117 		writel_relaxed(word, spi_st->base + SSC_TBUF);  in ssc_write_tx_fifo()
122 static void ssc_read_rx_fifo(struct spi_st *spi_st)  in ssc_read_rx_fifo()  argument
127 	if (spi_st->words_remaining > FIFO_SIZE)  in ssc_read_rx_fifo()
130 		count = spi_st->words_remaining;  in ssc_read_rx_fifo()
133 		word = readl_relaxed(spi_st->base + SSC_RBUF);  in ssc_read_rx_fifo()
135 		if (spi_st->rx_ptr) {  in ssc_read_rx_fifo()
136 			if (spi_st->bytes_per_word == 1) {  in ssc_read_rx_fifo()
137 				*spi_st->rx_ptr++ = (uint8_t)word;  in ssc_read_rx_fifo()
139 				*spi_st->rx_ptr++ = (word >> 8);  in ssc_read_rx_fifo()
140 				*spi_st->rx_ptr++ = word & 0xff;  in ssc_read_rx_fifo()
144 	spi_st->words_remaining -= count;  in ssc_read_rx_fifo()
150 	struct spi_st *spi_st = spi_master_get_devdata(master);  in spi_st_transfer_one()  local
154 	spi_st->tx_ptr = t->tx_buf;  in spi_st_transfer_one()
155 	spi_st->rx_ptr = t->rx_buf;  in spi_st_transfer_one()
162 		spi_st->bytes_per_word = 2;  in spi_st_transfer_one()
163 		spi_st->words_remaining = t->len / 2;  in spi_st_transfer_one()
170 		spi_st->bytes_per_word = 2;  in spi_st_transfer_one()
171 		spi_st->words_remaining = t->len / 2;  in spi_st_transfer_one()
174 		ctl = readl_relaxed(spi_st->base + SSC_CTL);  in spi_st_transfer_one()
175 		writel_relaxed((ctl | 0xf), spi_st->base + SSC_CTL);  in spi_st_transfer_one()
177 		readl_relaxed(spi_st->base + SSC_RBUF);  in spi_st_transfer_one()
180 		spi_st->bytes_per_word = 1;  in spi_st_transfer_one()
181 		spi_st->words_remaining = t->len;  in spi_st_transfer_one()
184 	reinit_completion(&spi_st->done);  in spi_st_transfer_one()
187 	ssc_write_tx_fifo(spi_st);  in spi_st_transfer_one()
188 	writel_relaxed(SSC_IEN_TEEN, spi_st->base + SSC_IEN);  in spi_st_transfer_one()
191 	wait_for_completion(&spi_st->done);  in spi_st_transfer_one()
195 		writel_relaxed(ctl, spi_st->base + SSC_CTL);  in spi_st_transfer_one()
214 	struct spi_st *spi_st = spi_master_get_devdata(spi->master);  in spi_st_setup()  local
239 	spi_st_clk = clk_get_rate(spi_st->clk);  in spi_st_setup()
249 	spi_st->baud = spi_st_clk / (2 * sscbrg);  in spi_st_setup()
253 	writel_relaxed(sscbrg, spi_st->base + SSC_BRG);  in spi_st_setup()
257 		hz, spi_st->baud, sscbrg);  in spi_st_setup()
260 	 var = readl_relaxed(spi_st->base + SSC_CTL);  in spi_st_setup()
289 	 writel_relaxed(var, spi_st->base + SSC_CTL);  in spi_st_setup()
292 	 readl_relaxed(spi_st->base + SSC_RBUF);  in spi_st_setup()
300 	struct spi_st *spi_st = (struct spi_st *)dev_id;  in spi_st_irq()  local
303 	ssc_read_rx_fifo(spi_st);  in spi_st_irq()
306 	if (spi_st->words_remaining) {  in spi_st_irq()
307 		ssc_write_tx_fifo(spi_st);  in spi_st_irq()
310 		writel_relaxed(0x0, spi_st->base + SSC_IEN);  in spi_st_irq()
315 		readl(spi_st->base + SSC_IEN);  in spi_st_irq()
316 		complete(&spi_st->done);  in spi_st_irq()
327 	struct spi_st *spi_st;  in spi_st_probe()  local
331 	master = spi_alloc_master(&pdev->dev, sizeof(*spi_st));  in spi_st_probe()
343 	spi_st				= spi_master_get_devdata(master);  in spi_st_probe()
345 	spi_st->clk = devm_clk_get(&pdev->dev, "ssc");  in spi_st_probe()
346 	if (IS_ERR(spi_st->clk)) {  in spi_st_probe()
348 		return PTR_ERR(spi_st->clk);  in spi_st_probe()
351 	ret = spi_st_clk_enable(spi_st);  in spi_st_probe()
355 	init_completion(&spi_st->done);  in spi_st_probe()
359 	spi_st->base = devm_ioremap_resource(&pdev->dev, res);  in spi_st_probe()
360 	if (IS_ERR(spi_st->base)) {  in spi_st_probe()
361 		ret = PTR_ERR(spi_st->base);  in spi_st_probe()
366 	writel_relaxed(0x0, spi_st->base + SSC_I2C);  in spi_st_probe()
367 	var = readw_relaxed(spi_st->base + SSC_CTL);  in spi_st_probe()
369 	writel_relaxed(var, spi_st->base + SSC_CTL);  in spi_st_probe()
372 	var = readl_relaxed(spi_st->base + SSC_CTL);  in spi_st_probe()
374 	writel_relaxed(var, spi_st->base + SSC_CTL);  in spi_st_probe()
377 	var = readl_relaxed(spi_st->base + SSC_CTL);  in spi_st_probe()
379 	writel_relaxed(var, spi_st->base + SSC_CTL);  in spi_st_probe()
389 			       pdev->name, spi_st);  in spi_st_probe()
410 	spi_st_clk_disable(spi_st);  in spi_st_probe()
418 	struct spi_st *spi_st = spi_master_get_devdata(master);  in spi_st_remove()  local
420 	spi_st_clk_disable(spi_st);  in spi_st_remove()
431 	struct spi_st *spi_st = spi_master_get_devdata(master);  in spi_st_runtime_suspend()  local
433 	writel_relaxed(0, spi_st->base + SSC_IEN);  in spi_st_runtime_suspend()
436 	spi_st_clk_disable(spi_st);  in spi_st_runtime_suspend()
444 	struct spi_st *spi_st = spi_master_get_devdata(master);  in spi_st_runtime_resume()  local
447 	ret = spi_st_clk_enable(spi_st);  in spi_st_runtime_resume()