71 	struct altera_spi *hw = altera_spi_to_hw(spi);  in altera_spi_chipsel()  local
77 			       hw->base + ALTERA_SPI_SLAVE_SEL);  in altera_spi_chipsel()
78 			hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK;  in altera_spi_chipsel()
79 			writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);  in altera_spi_chipsel()
83 			hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK;  in altera_spi_chipsel()
84 			writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);  in altera_spi_chipsel()
85 			writel(0, hw->base + ALTERA_SPI_SLAVE_SEL);  in altera_spi_chipsel()
91 			hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK;  in altera_spi_chipsel()
92 			writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);  in altera_spi_chipsel()
97 			       hw->base + ALTERA_SPI_SLAVE_SEL);  in altera_spi_chipsel()
98 			hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK;  in altera_spi_chipsel()
99 			writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);  in altera_spi_chipsel()
105 static inline unsigned int hw_txbyte(struct altera_spi *hw, int count)  in hw_txbyte()  argument
107 	if (hw->tx) {  in hw_txbyte()
108 		switch (hw->bytes_per_word) {  in hw_txbyte()
110 			return hw->tx[count];  in hw_txbyte()
112 			return (hw->tx[count * 2]  in hw_txbyte()
113 				| (hw->tx[count * 2 + 1] << 8));  in hw_txbyte()
121 	struct altera_spi *hw = altera_spi_to_hw(spi);  in altera_spi_txrx()  local
123 	hw->tx = t->tx_buf;  in altera_spi_txrx()
124 	hw->rx = t->rx_buf;  in altera_spi_txrx()
125 	hw->count = 0;  in altera_spi_txrx()
126 	hw->bytes_per_word = DIV_ROUND_UP(t->bits_per_word, 8);  in altera_spi_txrx()
127 	hw->len = t->len / hw->bytes_per_word;  in altera_spi_txrx()
129 	if (hw->irq >= 0) {  in altera_spi_txrx()
131 		hw->imr |= ALTERA_SPI_CONTROL_IRRDY_MSK;  in altera_spi_txrx()
132 		writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);  in altera_spi_txrx()
135 		writel(hw_txbyte(hw, 0), hw->base + ALTERA_SPI_TXDATA);  in altera_spi_txrx()
137 		wait_for_completion(&hw->done);  in altera_spi_txrx()
139 		hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK;  in altera_spi_txrx()
140 		writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);  in altera_spi_txrx()
142 		while (hw->count < hw->len) {  in altera_spi_txrx()
145 			writel(hw_txbyte(hw, hw->count),  in altera_spi_txrx()
146 			       hw->base + ALTERA_SPI_TXDATA);  in altera_spi_txrx()
148 			while (!(readl(hw->base + ALTERA_SPI_STATUS) &  in altera_spi_txrx()
152 			rxd = readl(hw->base + ALTERA_SPI_RXDATA);  in altera_spi_txrx()
153 			if (hw->rx) {  in altera_spi_txrx()
154 				switch (hw->bytes_per_word) {  in altera_spi_txrx()
156 					hw->rx[hw->count] = rxd;  in altera_spi_txrx()
159 					hw->rx[hw->count * 2] = rxd;  in altera_spi_txrx()
160 					hw->rx[hw->count * 2 + 1] = rxd >> 8;  in altera_spi_txrx()
165 			hw->count++;  in altera_spi_txrx()
169 	return hw->count * hw->bytes_per_word;  in altera_spi_txrx()
174 	struct altera_spi *hw = dev;  in altera_spi_irq()  local
177 	rxd = readl(hw->base + ALTERA_SPI_RXDATA);  in altera_spi_irq()
178 	if (hw->rx) {  in altera_spi_irq()
179 		switch (hw->bytes_per_word) {  in altera_spi_irq()
181 			hw->rx[hw->count] = rxd;  in altera_spi_irq()
184 			hw->rx[hw->count * 2] = rxd;  in altera_spi_irq()
185 			hw->rx[hw->count * 2 + 1] = rxd >> 8;  in altera_spi_irq()
190 	hw->count++;  in altera_spi_irq()
192 	if (hw->count < hw->len)  in altera_spi_irq()
193 		writel(hw_txbyte(hw, hw->count), hw->base + ALTERA_SPI_TXDATA);  in altera_spi_irq()
195 		complete(&hw->done);  in altera_spi_irq()
202 	struct altera_spi *hw;  in altera_spi_probe()  local
218 	hw = spi_master_get_devdata(master);  in altera_spi_probe()
219 	platform_set_drvdata(pdev, hw);  in altera_spi_probe()
222 	hw->bitbang.master = master;  in altera_spi_probe()
223 	hw->bitbang.chipselect = altera_spi_chipsel;  in altera_spi_probe()
224 	hw->bitbang.txrx_bufs = altera_spi_txrx;  in altera_spi_probe()
228 	hw->base = devm_ioremap_resource(&pdev->dev, res);  in altera_spi_probe()
229 	if (IS_ERR(hw->base)) {  in altera_spi_probe()
230 		err = PTR_ERR(hw->base);  in altera_spi_probe()
234 	hw->imr = 0;		/* disable spi interrupts */  in altera_spi_probe()
235 	writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);  in altera_spi_probe()
236 	writel(0, hw->base + ALTERA_SPI_STATUS);	/* clear status reg */  in altera_spi_probe()
237 	if (readl(hw->base + ALTERA_SPI_STATUS) & ALTERA_SPI_STATUS_RRDY_MSK)  in altera_spi_probe()
238 		readl(hw->base + ALTERA_SPI_RXDATA);	/* flush rxdata */  in altera_spi_probe()
240 	hw->irq = platform_get_irq(pdev, 0);  in altera_spi_probe()
241 	if (hw->irq >= 0) {  in altera_spi_probe()
242 		init_completion(&hw->done);  in altera_spi_probe()
243 		err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0,  in altera_spi_probe()
244 				       pdev->name, hw);  in altera_spi_probe()
250 	err = spi_bitbang_start(&hw->bitbang);  in altera_spi_probe()
253 	dev_info(&pdev->dev, "base %p, irq %d\n", hw->base, hw->irq);  in altera_spi_probe()
263 	struct altera_spi *hw = platform_get_drvdata(dev);  in altera_spi_remove()  local
264 	struct spi_master *master = hw->bitbang.master;  in altera_spi_remove()
266 	spi_bitbang_stop(&hw->bitbang);  in altera_spi_remove()