64 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_baud()  local
66 	return min(DIV_ROUND_UP(hw->freq, hz * 2), (1U << hw->baudwidth)) - 1;  in tiny_spi_baud()
71 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_chipselect()  local
73 	if (hw->gpio_cs_count > 0) {  in tiny_spi_chipselect()
74 		gpio_set_value(hw->gpio_cs[spi->chip_select],  in tiny_spi_chipselect()
82 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_setup_transfer()  local
83 	unsigned int baud = hw->baud;  in tiny_spi_setup_transfer()
86 		if (t->speed_hz && t->speed_hz != hw->speed_hz)  in tiny_spi_setup_transfer()
89 	writel(baud, hw->base + TINY_SPI_BAUD);  in tiny_spi_setup_transfer()
90 	writel(hw->mode, hw->base + TINY_SPI_CONTROL);  in tiny_spi_setup_transfer()
96 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_setup()  local
98 	if (spi->max_speed_hz != hw->speed_hz) {  in tiny_spi_setup()
99 		hw->speed_hz = spi->max_speed_hz;  in tiny_spi_setup()
100 		hw->baud = tiny_spi_baud(spi, hw->speed_hz);  in tiny_spi_setup()
102 	hw->mode = spi->mode & (SPI_CPOL | SPI_CPHA);  in tiny_spi_setup()
106 static inline void tiny_spi_wait_txr(struct tiny_spi *hw)  in tiny_spi_wait_txr()  argument
108 	while (!(readb(hw->base + TINY_SPI_STATUS) &  in tiny_spi_wait_txr()
113 static inline void tiny_spi_wait_txe(struct tiny_spi *hw)  in tiny_spi_wait_txe()  argument
115 	while (!(readb(hw->base + TINY_SPI_STATUS) &  in tiny_spi_wait_txe()
122 	struct tiny_spi *hw = tiny_spi_to_hw(spi);  in tiny_spi_txrx_bufs()  local
127 	if (hw->irq >= 0) {  in tiny_spi_txrx_bufs()
129 		hw->len = t->len;  in tiny_spi_txrx_bufs()
130 		hw->txp = t->tx_buf;  in tiny_spi_txrx_bufs()
131 		hw->rxp = t->rx_buf;  in tiny_spi_txrx_bufs()
132 		hw->txc = 0;  in tiny_spi_txrx_bufs()
133 		hw->rxc = 0;  in tiny_spi_txrx_bufs()
137 			writeb(hw->txp ? *hw->txp++ : 0,  in tiny_spi_txrx_bufs()
138 			       hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
139 			hw->txc++;  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(TINY_SPI_STATUS_TXR, hw->base + TINY_SPI_STATUS);  in tiny_spi_txrx_bufs()
145 			writeb(hw->txp ? *hw->txp++ : 0,  in tiny_spi_txrx_bufs()
146 			       hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
147 			hw->txc++;  in tiny_spi_txrx_bufs()
148 			writeb(TINY_SPI_STATUS_TXE, hw->base + TINY_SPI_STATUS);  in tiny_spi_txrx_bufs()
151 		wait_for_completion(&hw->done);  in tiny_spi_txrx_bufs()
154 		writeb(txp ? *txp++ : 0, hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
156 			writeb(txp ? *txp++ : 0, hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
159 				tiny_spi_wait_txr(hw);  in tiny_spi_txrx_bufs()
161 				*rxp++ = readb(hw->base + TINY_SPI_TXDATA);  in tiny_spi_txrx_bufs()
163 		tiny_spi_wait_txe(hw);  in tiny_spi_txrx_bufs()
165 			*rxp++ = readb(hw->base + TINY_SPI_RXDATA);  in tiny_spi_txrx_bufs()
173 	struct tiny_spi *hw = dev;  in tiny_spi_irq()  local
175 	writeb(0, hw->base + TINY_SPI_STATUS);  in tiny_spi_irq()
176 	if (hw->rxc + 1 == hw->len) {  in tiny_spi_irq()
177 		if (hw->rxp)  in tiny_spi_irq()
178 			*hw->rxp++ = readb(hw->base + TINY_SPI_RXDATA);  in tiny_spi_irq()
179 		hw->rxc++;  in tiny_spi_irq()
180 		complete(&hw->done);  in tiny_spi_irq()
182 		if (hw->rxp)  in tiny_spi_irq()
183 			*hw->rxp++ = readb(hw->base + TINY_SPI_TXDATA);  in tiny_spi_irq()
184 		hw->rxc++;  in tiny_spi_irq()
185 		if (hw->txc < hw->len) {  in tiny_spi_irq()
186 			writeb(hw->txp ? *hw->txp++ : 0,  in tiny_spi_irq()
187 			       hw->base + TINY_SPI_TXDATA);  in tiny_spi_irq()
188 			hw->txc++;  in tiny_spi_irq()
190 			       hw->base + TINY_SPI_STATUS);  in tiny_spi_irq()
193 			       hw->base + TINY_SPI_STATUS);  in tiny_spi_irq()
204 	struct tiny_spi *hw = platform_get_drvdata(pdev);  in tiny_spi_of_probe()  local
211 	hw->gpio_cs_count = of_gpio_count(np);  in tiny_spi_of_probe()
212 	if (hw->gpio_cs_count > 0) {  in tiny_spi_of_probe()
213 		hw->gpio_cs = devm_kcalloc(&pdev->dev,  in tiny_spi_of_probe()
214 				hw->gpio_cs_count, sizeof(unsigned int),  in tiny_spi_of_probe()
216 		if (!hw->gpio_cs)  in tiny_spi_of_probe()
219 	for (i = 0; i < hw->gpio_cs_count; i++) {  in tiny_spi_of_probe()
220 		hw->gpio_cs[i] = of_get_gpio_flags(np, i, NULL);  in tiny_spi_of_probe()
221 		if (hw->gpio_cs[i] < 0)  in tiny_spi_of_probe()
224 	hw->bitbang.master->dev.of_node = pdev->dev.of_node;  in tiny_spi_of_probe()
226 		hw->freq = val;  in tiny_spi_of_probe()
228 		hw->baudwidth = val;  in tiny_spi_of_probe()
241 	struct tiny_spi *hw;  in tiny_spi_probe()  local
256 	hw = spi_master_get_devdata(master);  in tiny_spi_probe()
257 	platform_set_drvdata(pdev, hw);  in tiny_spi_probe()
260 	hw->bitbang.master = master;  in tiny_spi_probe()
261 	hw->bitbang.setup_transfer = tiny_spi_setup_transfer;  in tiny_spi_probe()
262 	hw->bitbang.chipselect = tiny_spi_chipselect;  in tiny_spi_probe()
263 	hw->bitbang.txrx_bufs = tiny_spi_txrx_bufs;  in tiny_spi_probe()
266 	hw->base = devm_platform_ioremap_resource(pdev, 0);  in tiny_spi_probe()
267 	if (IS_ERR(hw->base)) {  in tiny_spi_probe()
268 		err = PTR_ERR(hw->base);  in tiny_spi_probe()
272 	hw->irq = platform_get_irq(pdev, 0);  in tiny_spi_probe()
273 	if (hw->irq >= 0) {  in tiny_spi_probe()
274 		init_completion(&hw->done);  in tiny_spi_probe()
275 		err = devm_request_irq(&pdev->dev, hw->irq, tiny_spi_irq, 0,  in tiny_spi_probe()
276 				       pdev->name, hw);  in tiny_spi_probe()
282 		hw->gpio_cs_count = platp->gpio_cs_count;  in tiny_spi_probe()
283 		hw->gpio_cs = platp->gpio_cs;  in tiny_spi_probe()
288 		hw->freq = platp->freq;  in tiny_spi_probe()
289 		hw->baudwidth = platp->baudwidth;  in tiny_spi_probe()
295 	for (i = 0; i < hw->gpio_cs_count; i++) {  in tiny_spi_probe()
296 		err = gpio_request(hw->gpio_cs[i], dev_name(&pdev->dev));  in tiny_spi_probe()
299 		gpio_direction_output(hw->gpio_cs[i], 1);  in tiny_spi_probe()
301 	hw->bitbang.master->num_chipselect = max(1, hw->gpio_cs_count);  in tiny_spi_probe()
304 	err = spi_bitbang_start(&hw->bitbang);  in tiny_spi_probe()
307 	dev_info(&pdev->dev, "base %p, irq %d\n", hw->base, hw->irq);  in tiny_spi_probe()
313 		gpio_free(hw->gpio_cs[i]);  in tiny_spi_probe()
321 	struct tiny_spi *hw = platform_get_drvdata(pdev);  in tiny_spi_remove()  local
322 	struct spi_master *master = hw->bitbang.master;  in tiny_spi_remove()
325 	spi_bitbang_stop(&hw->bitbang);  in tiny_spi_remove()
326 	for (i = 0; i < hw->gpio_cs_count; i++)  in tiny_spi_remove()
327 		gpio_free(hw->gpio_cs[i]);  in tiny_spi_remove()