53 struct spi_st {  struct
69 static void ssc_write_tx_fifo(struct spi_st *spi_st)  in ssc_write_tx_fifo()  argument
74 	if (spi_st->words_remaining > FIFO_SIZE)  in ssc_write_tx_fifo()
77 		count = spi_st->words_remaining;  in ssc_write_tx_fifo()
80 		if (spi_st->tx_ptr) {  in ssc_write_tx_fifo()
81 			if (spi_st->bytes_per_word == 1) {  in ssc_write_tx_fifo()
82 				word = *spi_st->tx_ptr++;  in ssc_write_tx_fifo()
84 				word = *spi_st->tx_ptr++;  in ssc_write_tx_fifo()
85 				word = *spi_st->tx_ptr++ | (word << 8);  in ssc_write_tx_fifo()
88 		writel_relaxed(word, spi_st->base + SSC_TBUF);  in ssc_write_tx_fifo()
93 static void ssc_read_rx_fifo(struct spi_st *spi_st)  in ssc_read_rx_fifo()  argument
98 	if (spi_st->words_remaining > FIFO_SIZE)  in ssc_read_rx_fifo()
101 		count = spi_st->words_remaining;  in ssc_read_rx_fifo()
104 		word = readl_relaxed(spi_st->base + SSC_RBUF);  in ssc_read_rx_fifo()
106 		if (spi_st->rx_ptr) {  in ssc_read_rx_fifo()
107 			if (spi_st->bytes_per_word == 1) {  in ssc_read_rx_fifo()
108 				*spi_st->rx_ptr++ = (uint8_t)word;  in ssc_read_rx_fifo()
110 				*spi_st->rx_ptr++ = (word >> 8);  in ssc_read_rx_fifo()
111 				*spi_st->rx_ptr++ = word & 0xff;  in ssc_read_rx_fifo()
115 	spi_st->words_remaining -= count;  in ssc_read_rx_fifo()
121 	struct spi_st *spi_st = spi_master_get_devdata(master);  in spi_st_transfer_one()  local
125 	spi_st->tx_ptr = t->tx_buf;  in spi_st_transfer_one()
126 	spi_st->rx_ptr = t->rx_buf;  in spi_st_transfer_one()
133 		spi_st->bytes_per_word = 2;  in spi_st_transfer_one()
134 		spi_st->words_remaining = t->len / 2;  in spi_st_transfer_one()
141 		spi_st->bytes_per_word = 2;  in spi_st_transfer_one()
142 		spi_st->words_remaining = t->len / 2;  in spi_st_transfer_one()
145 		ctl = readl_relaxed(spi_st->base + SSC_CTL);  in spi_st_transfer_one()
146 		writel_relaxed((ctl | 0xf), spi_st->base + SSC_CTL);  in spi_st_transfer_one()
148 		readl_relaxed(spi_st->base + SSC_RBUF);  in spi_st_transfer_one()
151 		spi_st->bytes_per_word = 1;  in spi_st_transfer_one()
152 		spi_st->words_remaining = t->len;  in spi_st_transfer_one()
155 	reinit_completion(&spi_st->done);  in spi_st_transfer_one()
158 	ssc_write_tx_fifo(spi_st);  in spi_st_transfer_one()
159 	writel_relaxed(SSC_IEN_TEEN, spi_st->base + SSC_IEN);  in spi_st_transfer_one()
162 	wait_for_completion(&spi_st->done);  in spi_st_transfer_one()
166 		writel_relaxed(ctl, spi_st->base + SSC_CTL);  in spi_st_transfer_one()
177 	struct spi_st *spi_st = spi_master_get_devdata(spi->master);  in spi_st_setup()  local
191 	spi_st_clk = clk_get_rate(spi_st->clk);  in spi_st_setup()
201 	spi_st->baud = spi_st_clk / (2 * sscbrg);  in spi_st_setup()
205 	writel_relaxed(sscbrg, spi_st->base + SSC_BRG);  in spi_st_setup()
209 		hz, spi_st->baud, sscbrg);  in spi_st_setup()
212 	var = readl_relaxed(spi_st->base + SSC_CTL);  in spi_st_setup()
241 	writel_relaxed(var, spi_st->base + SSC_CTL);  in spi_st_setup()
244 	readl_relaxed(spi_st->base + SSC_RBUF);  in spi_st_setup()
252 	struct spi_st *spi_st = (struct spi_st *)dev_id;  in spi_st_irq()  local
255 	ssc_read_rx_fifo(spi_st);  in spi_st_irq()
258 	if (spi_st->words_remaining) {  in spi_st_irq()
259 		ssc_write_tx_fifo(spi_st);  in spi_st_irq()
262 		writel_relaxed(0x0, spi_st->base + SSC_IEN);  in spi_st_irq()
267 		readl(spi_st->base + SSC_IEN);  in spi_st_irq()
268 		complete(&spi_st->done);  in spi_st_irq()
278 	struct spi_st *spi_st;  in spi_st_probe()  local
282 	master = spi_alloc_master(&pdev->dev, sizeof(*spi_st));  in spi_st_probe()
294 	spi_st				= spi_master_get_devdata(master);  in spi_st_probe()
296 	spi_st->clk = devm_clk_get(&pdev->dev, "ssc");  in spi_st_probe()
297 	if (IS_ERR(spi_st->clk)) {  in spi_st_probe()
299 		ret = PTR_ERR(spi_st->clk);  in spi_st_probe()
303 	ret = clk_prepare_enable(spi_st->clk);  in spi_st_probe()
307 	init_completion(&spi_st->done);  in spi_st_probe()
310 	spi_st->base = devm_platform_ioremap_resource(pdev, 0);  in spi_st_probe()
311 	if (IS_ERR(spi_st->base)) {  in spi_st_probe()
312 		ret = PTR_ERR(spi_st->base);  in spi_st_probe()
317 	writel_relaxed(0x0, spi_st->base + SSC_I2C);  in spi_st_probe()
318 	var = readw_relaxed(spi_st->base + SSC_CTL);  in spi_st_probe()
320 	writel_relaxed(var, spi_st->base + SSC_CTL);  in spi_st_probe()
323 	var = readl_relaxed(spi_st->base + SSC_CTL);  in spi_st_probe()
325 	writel_relaxed(var, spi_st->base + SSC_CTL);  in spi_st_probe()
328 	var = readl_relaxed(spi_st->base + SSC_CTL);  in spi_st_probe()
330 	writel_relaxed(var, spi_st->base + SSC_CTL);  in spi_st_probe()
340 			       pdev->name, spi_st);  in spi_st_probe()
363 	clk_disable_unprepare(spi_st->clk);  in spi_st_probe()
372 	struct spi_st *spi_st = spi_master_get_devdata(master);  in spi_st_remove()  local
376 	clk_disable_unprepare(spi_st->clk);  in spi_st_remove()
385 	struct spi_st *spi_st = spi_master_get_devdata(master);  in spi_st_runtime_suspend()  local
387 	writel_relaxed(0, spi_st->base + SSC_IEN);  in spi_st_runtime_suspend()
390 	clk_disable_unprepare(spi_st->clk);  in spi_st_runtime_suspend()
398 	struct spi_st *spi_st = spi_master_get_devdata(master);  in spi_st_runtime_resume()  local
401 	ret = clk_prepare_enable(spi_st->clk);  in spi_st_runtime_resume()