67 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_baud()  local
69 	return min(DIV_ROUND_UP(hw->freq, hz * 2), (1U << hw->baudwidth)) - 1;  in tiny_spi_baud()
74 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_chipselect()  local
76 	if (hw->gpio_cs_count > 0) {  in tiny_spi_chipselect()
77 		gpio_set_value(hw->gpio_cs[spi->chip_select],  in tiny_spi_chipselect()
85 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_setup_transfer()  local
86 	unsigned int baud = hw->baud;  in tiny_spi_setup_transfer()
89 		if (t->speed_hz && t->speed_hz != hw->speed_hz)  in tiny_spi_setup_transfer()
92 	writel(baud, hw->base + TINY_SPI_BAUD);  in tiny_spi_setup_transfer()
93 	writel(hw->mode, hw->base + TINY_SPI_CONTROL);  in tiny_spi_setup_transfer()
99 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_setup()  local
101 	if (spi->max_speed_hz != hw->speed_hz) {  in tiny_spi_setup()
102 		hw->speed_hz = spi->max_speed_hz;  in tiny_spi_setup()
103 		hw->baud = tiny_spi_baud(spi, hw->speed_hz);  in tiny_spi_setup()
105 	hw->mode = spi->mode & (SPI_CPOL | SPI_CPHA);  in tiny_spi_setup()
109 static inline void tiny_spi_wait_txr(struct tiny_spi *hw)  in tiny_spi_wait_txr()  argument
111 	while (!(readb(hw->base + TINY_SPI_STATUS) &  in tiny_spi_wait_txr()
116 static inline void tiny_spi_wait_txe(struct tiny_spi *hw)  in tiny_spi_wait_txe()  argument
118 	while (!(readb(hw->base + TINY_SPI_STATUS) &  in tiny_spi_wait_txe()
125 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_txrx_bufs()  local
130 	if (hw->irq >= 0) {  in tiny_spi_txrx_bufs()
132 		hw->len = t->len;  in tiny_spi_txrx_bufs()
133 		hw->txp = t->tx_buf;  in tiny_spi_txrx_bufs()
134 		hw->rxp = t->rx_buf;  in tiny_spi_txrx_bufs()
135 		hw->txc = 0;  in tiny_spi_txrx_bufs()
136 		hw->rxc = 0;  in tiny_spi_txrx_bufs()
140 			writeb(hw->txp ? *hw->txp++ : 0,  in tiny_spi_txrx_bufs()
141 			       hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
142 			hw->txc++;  in tiny_spi_txrx_bufs()
143 			writeb(hw->txp ? *hw->txp++ : 0,  in tiny_spi_txrx_bufs()
144 			       hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
145 			hw->txc++;  in tiny_spi_txrx_bufs()
146 			writeb(TINY_SPI_STATUS_TXR, hw->base + TINY_SPI_STATUS);  in tiny_spi_txrx_bufs()
148 			writeb(hw->txp ? *hw->txp++ : 0,  in tiny_spi_txrx_bufs()
149 			       hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
150 			hw->txc++;  in tiny_spi_txrx_bufs()
151 			writeb(TINY_SPI_STATUS_TXE, hw->base + TINY_SPI_STATUS);  in tiny_spi_txrx_bufs()
154 		wait_for_completion(&hw->done);  in tiny_spi_txrx_bufs()
157 		writeb(txp ? *txp++ : 0, hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
159 			writeb(txp ? *txp++ : 0, hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
162 				tiny_spi_wait_txr(hw);  in tiny_spi_txrx_bufs()
164 				*rxp++ = readb(hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
166 		tiny_spi_wait_txe(hw);  in tiny_spi_txrx_bufs()
168 			*rxp++ = readb(hw->base + TINY_SPI_RXDATA);  in tiny_spi_txrx_bufs()
176 	struct tiny_spi *hw = dev;  in tiny_spi_irq()  local
178 	writeb(0, hw->base + TINY_SPI_STATUS);  in tiny_spi_irq()
179 	if (hw->rxc + 1 == hw->len) {  in tiny_spi_irq()
180 		if (hw->rxp)  in tiny_spi_irq()
181 			*hw->rxp++ = readb(hw->base + TINY_SPI_RXDATA);  in tiny_spi_irq()
182 		hw->rxc++;  in tiny_spi_irq()
183 		complete(&hw->done);  in tiny_spi_irq()
185 		if (hw->rxp)  in tiny_spi_irq()
186 			*hw->rxp++ = readb(hw->base + TINY_SPI_TXDATA);  in tiny_spi_irq()
187 		hw->rxc++;  in tiny_spi_irq()
188 		if (hw->txc < hw->len) {  in tiny_spi_irq()
189 			writeb(hw->txp ? *hw->txp++ : 0,  in tiny_spi_irq()
190 			       hw->base + TINY_SPI_TXDATA);  in tiny_spi_irq()
191 			hw->txc++;  in tiny_spi_irq()
193 			       hw->base + TINY_SPI_STATUS);  in tiny_spi_irq()
196 			       hw->base + TINY_SPI_STATUS);  in tiny_spi_irq()
207 	struct tiny_spi *hw = platform_get_drvdata(pdev);  in tiny_spi_of_probe()  local
214 	hw->gpio_cs_count = of_gpio_count(np);  in tiny_spi_of_probe()
215 	if (hw->gpio_cs_count > 0) {  in tiny_spi_of_probe()
216 		hw->gpio_cs = devm_kzalloc(&pdev->dev,  in tiny_spi_of_probe()
217 				hw->gpio_cs_count * sizeof(unsigned int),  in tiny_spi_of_probe()
219 		if (!hw->gpio_cs)  in tiny_spi_of_probe()
222 	for (i = 0; i < hw->gpio_cs_count; i++) {  in tiny_spi_of_probe()
223 		hw->gpio_cs[i] = of_get_gpio_flags(np, i, NULL);  in tiny_spi_of_probe()
224 		if (hw->gpio_cs[i] < 0)  in tiny_spi_of_probe()
227 	hw->bitbang.master->dev.of_node = pdev->dev.of_node;  in tiny_spi_of_probe()
229 		hw->freq = val;  in tiny_spi_of_probe()
231 		hw->baudwidth = val;  in tiny_spi_of_probe()
244 	struct tiny_spi *hw;  in tiny_spi_probe()  local
260 	hw = spi_master_get_devdata(master);  in tiny_spi_probe()
261 	platform_set_drvdata(pdev, hw);  in tiny_spi_probe()
264 	hw->bitbang.master = master;  in tiny_spi_probe()
265 	hw->bitbang.setup_transfer = tiny_spi_setup_transfer;  in tiny_spi_probe()
266 	hw->bitbang.chipselect = tiny_spi_chipselect;  in tiny_spi_probe()
267 	hw->bitbang.txrx_bufs = tiny_spi_txrx_bufs;  in tiny_spi_probe()
271 	hw->base = devm_ioremap_resource(&pdev->dev, res);  in tiny_spi_probe()
272 	if (IS_ERR(hw->base)) {  in tiny_spi_probe()
273 		err = PTR_ERR(hw->base);  in tiny_spi_probe()
277 	hw->irq = platform_get_irq(pdev, 0);  in tiny_spi_probe()
278 	if (hw->irq >= 0) {  in tiny_spi_probe()
279 		init_completion(&hw->done);  in tiny_spi_probe()
280 		err = devm_request_irq(&pdev->dev, hw->irq, tiny_spi_irq, 0,  in tiny_spi_probe()
281 				       pdev->name, hw);  in tiny_spi_probe()
287 		hw->gpio_cs_count = platp->gpio_cs_count;  in tiny_spi_probe()
288 		hw->gpio_cs = platp->gpio_cs;  in tiny_spi_probe()
293 		hw->freq = platp->freq;  in tiny_spi_probe()
294 		hw->baudwidth = platp->baudwidth;  in tiny_spi_probe()
300 	for (i = 0; i < hw->gpio_cs_count; i++) {  in tiny_spi_probe()
301 		err = gpio_request(hw->gpio_cs[i], dev_name(&pdev->dev));  in tiny_spi_probe()
304 		gpio_direction_output(hw->gpio_cs[i], 1);  in tiny_spi_probe()
306 	hw->bitbang.master->num_chipselect = max(1, hw->gpio_cs_count);  in tiny_spi_probe()
309 	err = spi_bitbang_start(&hw->bitbang);  in tiny_spi_probe()
312 	dev_info(&pdev->dev, "base %p, irq %d\n", hw->base, hw->irq);  in tiny_spi_probe()
318 		gpio_free(hw->gpio_cs[i]);  in tiny_spi_probe()
326 	struct tiny_spi *hw = platform_get_drvdata(pdev);  in tiny_spi_remove()  local
327 	struct spi_master *master = hw->bitbang.master;  in tiny_spi_remove()
330 	spi_bitbang_stop(&hw->bitbang);  in tiny_spi_remove()
331 	for (i = 0; i < hw->gpio_cs_count; i++)  in tiny_spi_remove()
332 		gpio_free(hw->gpio_cs[i]);  in tiny_spi_remove()