72 	struct nuc900_spi *hw = to_hw(spi);  in nuc900_slave_select()  local
78 	spin_lock_irqsave(&hw->lock, flags);  in nuc900_slave_select()
80 	val = __raw_readl(hw->regs + USI_SSR);  in nuc900_slave_select()
92 	__raw_writel(val, hw->regs + USI_SSR);  in nuc900_slave_select()
94 	val = __raw_readl(hw->regs + USI_CNT);  in nuc900_slave_select()
101 	__raw_writel(val, hw->regs + USI_CNT);  in nuc900_slave_select()
103 	spin_unlock_irqrestore(&hw->lock, flags);  in nuc900_slave_select()
119 static void nuc900_spi_setup_txnum(struct nuc900_spi *hw, unsigned int txnum)  in nuc900_spi_setup_txnum()  argument
124 	spin_lock_irqsave(&hw->lock, flags);  in nuc900_spi_setup_txnum()
126 	val = __raw_readl(hw->regs + USI_CNT) & ~TXNUM;  in nuc900_spi_setup_txnum()
131 	__raw_writel(val, hw->regs + USI_CNT);  in nuc900_spi_setup_txnum()
133 	spin_unlock_irqrestore(&hw->lock, flags);  in nuc900_spi_setup_txnum()
137 static void nuc900_spi_setup_txbitlen(struct nuc900_spi *hw,  in nuc900_spi_setup_txbitlen()  argument
143 	spin_lock_irqsave(&hw->lock, flags);  in nuc900_spi_setup_txbitlen()
145 	val = __raw_readl(hw->regs + USI_CNT) & ~TXBITLEN;  in nuc900_spi_setup_txbitlen()
149 	__raw_writel(val, hw->regs + USI_CNT);  in nuc900_spi_setup_txbitlen()
151 	spin_unlock_irqrestore(&hw->lock, flags);  in nuc900_spi_setup_txbitlen()
154 static void nuc900_spi_gobusy(struct nuc900_spi *hw)  in nuc900_spi_gobusy()  argument
159 	spin_lock_irqsave(&hw->lock, flags);  in nuc900_spi_gobusy()
161 	val = __raw_readl(hw->regs + USI_CNT);  in nuc900_spi_gobusy()
165 	__raw_writel(val, hw->regs + USI_CNT);  in nuc900_spi_gobusy()
167 	spin_unlock_irqrestore(&hw->lock, flags);  in nuc900_spi_gobusy()
170 static inline unsigned int hw_txbyte(struct nuc900_spi *hw, int count)  in hw_txbyte()  argument
172 	return hw->tx ? hw->tx[count] : 0;  in hw_txbyte()
177 	struct nuc900_spi *hw = to_hw(spi);  in nuc900_spi_txrx()  local
179 	hw->tx = t->tx_buf;  in nuc900_spi_txrx()
180 	hw->rx = t->rx_buf;  in nuc900_spi_txrx()
181 	hw->len = t->len;  in nuc900_spi_txrx()
182 	hw->count = 0;  in nuc900_spi_txrx()
184 	__raw_writel(hw_txbyte(hw, 0x0), hw->regs + USI_TX0);  in nuc900_spi_txrx()
186 	nuc900_spi_gobusy(hw);  in nuc900_spi_txrx()
188 	wait_for_completion(&hw->done);  in nuc900_spi_txrx()
190 	return hw->count;  in nuc900_spi_txrx()
195 	struct nuc900_spi *hw = dev;  in nuc900_spi_irq()  local
197 	unsigned int count = hw->count;  in nuc900_spi_irq()
199 	status = __raw_readl(hw->regs + USI_CNT);  in nuc900_spi_irq()
200 	__raw_writel(status, hw->regs + USI_CNT);  in nuc900_spi_irq()
203 		hw->count++;  in nuc900_spi_irq()
205 		if (hw->rx)  in nuc900_spi_irq()
206 			hw->rx[count] = __raw_readl(hw->regs + USI_RX0);  in nuc900_spi_irq()
209 		if (count < hw->len) {  in nuc900_spi_irq()
210 			__raw_writel(hw_txbyte(hw, count), hw->regs + USI_TX0);  in nuc900_spi_irq()
211 			nuc900_spi_gobusy(hw);  in nuc900_spi_irq()
213 			complete(&hw->done);  in nuc900_spi_irq()
219 	complete(&hw->done);  in nuc900_spi_irq()
223 static void nuc900_tx_edge(struct nuc900_spi *hw, unsigned int edge)  in nuc900_tx_edge()  argument
228 	spin_lock_irqsave(&hw->lock, flags);  in nuc900_tx_edge()
230 	val = __raw_readl(hw->regs + USI_CNT);  in nuc900_tx_edge()
236 	__raw_writel(val, hw->regs + USI_CNT);  in nuc900_tx_edge()
238 	spin_unlock_irqrestore(&hw->lock, flags);  in nuc900_tx_edge()
241 static void nuc900_rx_edge(struct nuc900_spi *hw, unsigned int edge)  in nuc900_rx_edge()  argument
246 	spin_lock_irqsave(&hw->lock, flags);  in nuc900_rx_edge()
248 	val = __raw_readl(hw->regs + USI_CNT);  in nuc900_rx_edge()
254 	__raw_writel(val, hw->regs + USI_CNT);  in nuc900_rx_edge()
256 	spin_unlock_irqrestore(&hw->lock, flags);  in nuc900_rx_edge()
259 static void nuc900_send_first(struct nuc900_spi *hw, unsigned int lsb)  in nuc900_send_first()  argument
264 	spin_lock_irqsave(&hw->lock, flags);  in nuc900_send_first()
266 	val = __raw_readl(hw->regs + USI_CNT);  in nuc900_send_first()
272 	__raw_writel(val, hw->regs + USI_CNT);  in nuc900_send_first()
274 	spin_unlock_irqrestore(&hw->lock, flags);  in nuc900_send_first()
277 static void nuc900_set_sleep(struct nuc900_spi *hw, unsigned int sleep)  in nuc900_set_sleep()  argument
282 	spin_lock_irqsave(&hw->lock, flags);  in nuc900_set_sleep()
284 	val = __raw_readl(hw->regs + USI_CNT) & ~SLEEP;  in nuc900_set_sleep()
289 	__raw_writel(val, hw->regs + USI_CNT);  in nuc900_set_sleep()
291 	spin_unlock_irqrestore(&hw->lock, flags);  in nuc900_set_sleep()
294 static void nuc900_enable_int(struct nuc900_spi *hw)  in nuc900_enable_int()  argument
299 	spin_lock_irqsave(&hw->lock, flags);  in nuc900_enable_int()
301 	val = __raw_readl(hw->regs + USI_CNT);  in nuc900_enable_int()
305 	__raw_writel(val, hw->regs + USI_CNT);  in nuc900_enable_int()
307 	spin_unlock_irqrestore(&hw->lock, flags);  in nuc900_enable_int()
310 static void nuc900_set_divider(struct nuc900_spi *hw)  in nuc900_set_divider()  argument
312 	__raw_writel(hw->pdata->divider, hw->regs + USI_DIV);  in nuc900_set_divider()
315 static void nuc900_init_spi(struct nuc900_spi *hw)  in nuc900_init_spi()  argument
317 	clk_enable(hw->clk);  in nuc900_init_spi()
318 	spin_lock_init(&hw->lock);  in nuc900_init_spi()
320 	nuc900_tx_edge(hw, hw->pdata->txneg);  in nuc900_init_spi()
321 	nuc900_rx_edge(hw, hw->pdata->rxneg);  in nuc900_init_spi()
322 	nuc900_send_first(hw, hw->pdata->lsb);  in nuc900_init_spi()
323 	nuc900_set_sleep(hw, hw->pdata->sleep);  in nuc900_init_spi()
324 	nuc900_spi_setup_txbitlen(hw, hw->pdata->txbitlen);  in nuc900_init_spi()
325 	nuc900_spi_setup_txnum(hw, hw->pdata->txnum);  in nuc900_init_spi()
326 	nuc900_set_divider(hw);  in nuc900_init_spi()
327 	nuc900_enable_int(hw);  in nuc900_init_spi()
332 	struct nuc900_spi *hw;  in nuc900_spi_probe()  local
343 	hw = spi_master_get_devdata(master);  in nuc900_spi_probe()
344 	hw->master = master;  in nuc900_spi_probe()
345 	hw->pdata  = dev_get_platdata(&pdev->dev);  in nuc900_spi_probe()
347 	if (hw->pdata == NULL) {  in nuc900_spi_probe()
353 	platform_set_drvdata(pdev, hw);  in nuc900_spi_probe()
354 	init_completion(&hw->done);  in nuc900_spi_probe()
357 	if (hw->pdata->lsb)  in nuc900_spi_probe()
359 	master->num_chipselect     = hw->pdata->num_cs;  in nuc900_spi_probe()
360 	master->bus_num            = hw->pdata->bus_num;  in nuc900_spi_probe()
361 	hw->bitbang.master         = hw->master;  in nuc900_spi_probe()
362 	hw->bitbang.chipselect     = nuc900_spi_chipsel;  in nuc900_spi_probe()
363 	hw->bitbang.txrx_bufs      = nuc900_spi_txrx;  in nuc900_spi_probe()
366 	hw->regs = devm_ioremap_resource(&pdev->dev, res);  in nuc900_spi_probe()
367 	if (IS_ERR(hw->regs)) {  in nuc900_spi_probe()
368 		err = PTR_ERR(hw->regs);  in nuc900_spi_probe()
372 	hw->irq = platform_get_irq(pdev, 0);  in nuc900_spi_probe()
373 	if (hw->irq < 0) {  in nuc900_spi_probe()
379 	err = devm_request_irq(&pdev->dev, hw->irq, nuc900_spi_irq, 0,  in nuc900_spi_probe()
380 				pdev->name, hw);  in nuc900_spi_probe()
386 	hw->clk = devm_clk_get(&pdev->dev, "spi");  in nuc900_spi_probe()
387 	if (IS_ERR(hw->clk)) {  in nuc900_spi_probe()
389 		err = PTR_ERR(hw->clk);  in nuc900_spi_probe()
394 	nuc900_init_spi(hw);  in nuc900_spi_probe()
396 	err = spi_bitbang_start(&hw->bitbang);  in nuc900_spi_probe()
405 	clk_disable(hw->clk);  in nuc900_spi_probe()
407 	spi_master_put(hw->master);  in nuc900_spi_probe()
413 	struct nuc900_spi *hw = platform_get_drvdata(dev);  in nuc900_spi_remove()  local
415 	spi_bitbang_stop(&hw->bitbang);  in nuc900_spi_remove()
416 	clk_disable(hw->clk);  in nuc900_spi_remove()
417 	spi_master_put(hw->master);  in nuc900_spi_remove()