36 #define SPI_CTRL1_SPIE		(1 << 7)
37 #define SPI_CTRL1_SPE		(1 << 6)
38 #define SPI_CTRL1_MSTR		(1 << 4)
39 #define SPI_CTRL1_CPOL		(1 << 3)
40 #define SPI_CTRL1_CPHA		(1 << 2)
41 #define SPI_CTRL1_SSOE		(1 << 1)
42 #define SPI_CTRL1_LSBFE		(1 << 0)
48 #define SPI_STATUS_SPIF		(1 << 7)
49 #define SPI_STATUS_WCOL		(1 << 6)
50 #define SPI_STATUS_MODF		(1 << 4)
60 #define FSM_POLL	1	/* need to poll for completion, an IRQ is */
87 	int (*state)(int irq, struct mpc52xx_spi *ms, u8 status, u8 data);
100 static void mpc52xx_spi_chipsel(struct mpc52xx_spi *ms, int value)  in mpc52xx_spi_chipsel()  argument
104 	if (ms->gpio_cs_count > 0) {  in mpc52xx_spi_chipsel()
105 		cs = spi_get_chipselect(ms->message->spi, 0);  in mpc52xx_spi_chipsel()
106 		gpiod_set_value(ms->gpio_cs[cs], value);  in mpc52xx_spi_chipsel()
108 		out_8(ms->regs + SPI_PORTDATA, value ? 0 : 0x08);  in mpc52xx_spi_chipsel()
117 static void mpc52xx_spi_start_transfer(struct mpc52xx_spi *ms)  in mpc52xx_spi_start_transfer()  argument
119 	ms->rx_buf = ms->transfer->rx_buf;  in mpc52xx_spi_start_transfer()
120 	ms->tx_buf = ms->transfer->tx_buf;  in mpc52xx_spi_start_transfer()
121 	ms->len = ms->transfer->len;  in mpc52xx_spi_start_transfer()
124 	if (ms->cs_change)  in mpc52xx_spi_start_transfer()
125 		mpc52xx_spi_chipsel(ms, 1);  in mpc52xx_spi_start_transfer()
126 	ms->cs_change = ms->transfer->cs_change;  in mpc52xx_spi_start_transfer()
129 	ms->wcol_tx_timestamp = mftb();  in mpc52xx_spi_start_transfer()
130 	if (ms->tx_buf)  in mpc52xx_spi_start_transfer()
131 		out_8(ms->regs + SPI_DATA, *ms->tx_buf++);  in mpc52xx_spi_start_transfer()
133 		out_8(ms->regs + SPI_DATA, 0);  in mpc52xx_spi_start_transfer()
137 static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms,
139 static int mpc52xx_spi_fsmstate_wait(int irq, struct mpc52xx_spi *ms,
149 mpc52xx_spi_fsmstate_idle(int irq, struct mpc52xx_spi *ms, u8 status, u8 data)  in mpc52xx_spi_fsmstate_idle()  argument
156 		dev_err(&ms->host->dev, "spurious irq, status=0x%.2x\n",  in mpc52xx_spi_fsmstate_idle()
160 	if (list_empty(&ms->queue))  in mpc52xx_spi_fsmstate_idle()
164 	ms->message = list_first_entry(&ms->queue, struct spi_message, queue);  in mpc52xx_spi_fsmstate_idle()
165 	list_del_init(&ms->message->queue);  in mpc52xx_spi_fsmstate_idle()
169 	spi = ms->message->spi;  in mpc52xx_spi_fsmstate_idle()
176 	out_8(ms->regs + SPI_CTRL1, ctrl1);  in mpc52xx_spi_fsmstate_idle()
179 	/* minimum divider is '2'.  Also, add '1' to force rounding the  in mpc52xx_spi_fsmstate_idle()
181 	sppr = ((ms->ipb_freq / ms->message->spi->max_speed_hz) + 1) >> 1;  in mpc52xx_spi_fsmstate_idle()
183 	if (sppr < 1)  in mpc52xx_spi_fsmstate_idle()
184 		sppr = 1;  in mpc52xx_spi_fsmstate_idle()
185 	while (((sppr - 1) & ~0x7) != 0) {  in mpc52xx_spi_fsmstate_idle()
186 		sppr = (sppr + 1) >> 1; /* add '1' to force rounding up */  in mpc52xx_spi_fsmstate_idle()
189 	sppr--;		/* sppr quantity in register is offset by 1 */  in mpc52xx_spi_fsmstate_idle()
195 	out_8(ms->regs + SPI_BRR, sppr << 4 | spr); /* Set speed */  in mpc52xx_spi_fsmstate_idle()
197 	ms->cs_change = 1;  in mpc52xx_spi_fsmstate_idle()
198 	ms->transfer = container_of(ms->message->transfers.next,  in mpc52xx_spi_fsmstate_idle()
201 	mpc52xx_spi_start_transfer(ms);  in mpc52xx_spi_fsmstate_idle()
202 	ms->state = mpc52xx_spi_fsmstate_transfer;  in mpc52xx_spi_fsmstate_idle()
215 static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms,  in mpc52xx_spi_fsmstate_transfer()  argument
219 		return ms->irq0 ? FSM_STOP : FSM_POLL;  in mpc52xx_spi_fsmstate_transfer()
229 		ms->wcol_count++;  in mpc52xx_spi_fsmstate_transfer()
230 		ms->wcol_ticks += mftb() - ms->wcol_tx_timestamp;  in mpc52xx_spi_fsmstate_transfer()
231 		ms->wcol_tx_timestamp = mftb();  in mpc52xx_spi_fsmstate_transfer()
233 		if (ms->tx_buf)  in mpc52xx_spi_fsmstate_transfer()
234 			data = *(ms->tx_buf - 1);  in mpc52xx_spi_fsmstate_transfer()
235 		out_8(ms->regs + SPI_DATA, data); /* try again */  in mpc52xx_spi_fsmstate_transfer()
238 		ms->modf_count++;  in mpc52xx_spi_fsmstate_transfer()
239 		dev_err(&ms->host->dev, "mode fault\n");  in mpc52xx_spi_fsmstate_transfer()
240 		mpc52xx_spi_chipsel(ms, 0);  in mpc52xx_spi_fsmstate_transfer()
241 		ms->message->status = -EIO;  in mpc52xx_spi_fsmstate_transfer()
242 		if (ms->message->complete)  in mpc52xx_spi_fsmstate_transfer()
243 			ms->message->complete(ms->message->context);  in mpc52xx_spi_fsmstate_transfer()
244 		ms->state = mpc52xx_spi_fsmstate_idle;  in mpc52xx_spi_fsmstate_transfer()
249 	ms->byte_count++;  in mpc52xx_spi_fsmstate_transfer()
250 	if (ms->rx_buf)  in mpc52xx_spi_fsmstate_transfer()
251 		*ms->rx_buf++ = data;  in mpc52xx_spi_fsmstate_transfer()
254 	ms->len--;  in mpc52xx_spi_fsmstate_transfer()
255 	if (ms->len == 0) {  in mpc52xx_spi_fsmstate_transfer()
256 		ms->timestamp = mftb();  in mpc52xx_spi_fsmstate_transfer()
257 		if (ms->transfer->delay.unit == SPI_DELAY_UNIT_USECS)  in mpc52xx_spi_fsmstate_transfer()
258 			ms->timestamp += ms->transfer->delay.value *  in mpc52xx_spi_fsmstate_transfer()
260 		ms->state = mpc52xx_spi_fsmstate_wait;  in mpc52xx_spi_fsmstate_transfer()
265 	ms->wcol_tx_timestamp = mftb();  in mpc52xx_spi_fsmstate_transfer()
266 	if (ms->tx_buf)  in mpc52xx_spi_fsmstate_transfer()
267 		out_8(ms->regs + SPI_DATA, *ms->tx_buf++);  in mpc52xx_spi_fsmstate_transfer()
269 		out_8(ms->regs + SPI_DATA, 0);  in mpc52xx_spi_fsmstate_transfer()
281 mpc52xx_spi_fsmstate_wait(int irq, struct mpc52xx_spi *ms, u8 status, u8 data)  in mpc52xx_spi_fsmstate_wait()  argument
284 		dev_err(&ms->host->dev, "spurious irq, status=0x%.2x\n",  in mpc52xx_spi_fsmstate_wait()
287 	if (((int)mftb()) - ms->timestamp < 0)  in mpc52xx_spi_fsmstate_wait()
290 	ms->message->actual_length += ms->transfer->len;  in mpc52xx_spi_fsmstate_wait()
295 	if (ms->transfer->transfer_list.next == &ms->message->transfers) {  in mpc52xx_spi_fsmstate_wait()
296 		ms->msg_count++;  in mpc52xx_spi_fsmstate_wait()
297 		mpc52xx_spi_chipsel(ms, 0);  in mpc52xx_spi_fsmstate_wait()
298 		ms->message->status = 0;  in mpc52xx_spi_fsmstate_wait()
299 		if (ms->message->complete)  in mpc52xx_spi_fsmstate_wait()
300 			ms->message->complete(ms->message->context);  in mpc52xx_spi_fsmstate_wait()
301 		ms->state = mpc52xx_spi_fsmstate_idle;  in mpc52xx_spi_fsmstate_wait()
307 	if (ms->cs_change)  in mpc52xx_spi_fsmstate_wait()
308 		mpc52xx_spi_chipsel(ms, 0);  in mpc52xx_spi_fsmstate_wait()
310 	ms->transfer = container_of(ms->transfer->transfer_list.next,  in mpc52xx_spi_fsmstate_wait()
312 	mpc52xx_spi_start_transfer(ms);  in mpc52xx_spi_fsmstate_wait()
313 	ms->state = mpc52xx_spi_fsmstate_transfer;  in mpc52xx_spi_fsmstate_wait()
320  * @ms: pointer to mpc52xx_spi driver data
322 static void mpc52xx_spi_fsm_process(int irq, struct mpc52xx_spi *ms)  in mpc52xx_spi_fsm_process()  argument
330 		status = in_8(ms->regs + SPI_STATUS);  in mpc52xx_spi_fsm_process()
331 		data = in_8(ms->regs + SPI_DATA);  in mpc52xx_spi_fsm_process()
332 		rc = ms->state(irq, ms, status, data);  in mpc52xx_spi_fsm_process()
336 		schedule_work(&ms->work);  in mpc52xx_spi_fsm_process()
344 	struct mpc52xx_spi *ms = _ms;  in mpc52xx_spi_irq()  local
345 	spin_lock(&ms->lock);  in mpc52xx_spi_irq()
346 	mpc52xx_spi_fsm_process(irq, ms);  in mpc52xx_spi_irq()
347 	spin_unlock(&ms->lock);  in mpc52xx_spi_irq()
356 	struct mpc52xx_spi *ms = container_of(work, struct mpc52xx_spi, work);  in mpc52xx_spi_wq()  local
359 	spin_lock_irqsave(&ms->lock, flags);  in mpc52xx_spi_wq()
360 	mpc52xx_spi_fsm_process(0, ms);  in mpc52xx_spi_wq()
361 	spin_unlock_irqrestore(&ms->lock, flags);  in mpc52xx_spi_wq()
370 	struct mpc52xx_spi *ms = spi_controller_get_devdata(spi->controller);  in mpc52xx_spi_transfer()  local
376 	spin_lock_irqsave(&ms->lock, flags);  in mpc52xx_spi_transfer()
377 	list_add_tail(&m->queue, &ms->queue);  in mpc52xx_spi_transfer()
378 	spin_unlock_irqrestore(&ms->lock, flags);  in mpc52xx_spi_transfer()
379 	schedule_work(&ms->work);  in mpc52xx_spi_transfer()
390 	struct mpc52xx_spi *ms;  in mpc52xx_spi_probe()  local
424 	host = spi_alloc_host(&op->dev, sizeof(*ms));  in mpc52xx_spi_probe()
437 	ms = spi_controller_get_devdata(host);  in mpc52xx_spi_probe()
438 	ms->host = host;  in mpc52xx_spi_probe()
439 	ms->regs = regs;  in mpc52xx_spi_probe()
440 	ms->irq0 = irq_of_parse_and_map(op->dev.of_node, 0);  in mpc52xx_spi_probe()
441 	ms->irq1 = irq_of_parse_and_map(op->dev.of_node, 1);  in mpc52xx_spi_probe()
442 	ms->state = mpc52xx_spi_fsmstate_idle;  in mpc52xx_spi_probe()
443 	ms->ipb_freq = mpc5xxx_get_bus_frequency(&op->dev);  in mpc52xx_spi_probe()
444 	ms->gpio_cs_count = gpiod_count(&op->dev, NULL);  in mpc52xx_spi_probe()
445 	if (ms->gpio_cs_count > 0) {  in mpc52xx_spi_probe()
446 		host->num_chipselect = ms->gpio_cs_count;  in mpc52xx_spi_probe()
447 		ms->gpio_cs = kmalloc_array(ms->gpio_cs_count,  in mpc52xx_spi_probe()
448 					    sizeof(*ms->gpio_cs),  in mpc52xx_spi_probe()
450 		if (!ms->gpio_cs) {  in mpc52xx_spi_probe()
455 		for (i = 0; i < ms->gpio_cs_count; i++) {  in mpc52xx_spi_probe()
466 			ms->gpio_cs[i] = gpio_cs;  in mpc52xx_spi_probe()
470 	spin_lock_init(&ms->lock);  in mpc52xx_spi_probe()
471 	INIT_LIST_HEAD(&ms->queue);  in mpc52xx_spi_probe()
472 	INIT_WORK(&ms->work, mpc52xx_spi_wq);  in mpc52xx_spi_probe()
475 	if (ms->irq0 && ms->irq1) {  in mpc52xx_spi_probe()
476 		rc = request_irq(ms->irq0, mpc52xx_spi_irq, 0,  in mpc52xx_spi_probe()
477 				  "mpc5200-spi-modf", ms);  in mpc52xx_spi_probe()
478 		rc |= request_irq(ms->irq1, mpc52xx_spi_irq, 0,  in mpc52xx_spi_probe()
479 				  "mpc5200-spi-spif", ms);  in mpc52xx_spi_probe()
481 			free_irq(ms->irq0, ms);  in mpc52xx_spi_probe()
482 			free_irq(ms->irq1, ms);  in mpc52xx_spi_probe()
483 			ms->irq0 = ms->irq1 = 0;  in mpc52xx_spi_probe()
487 		ms->irq0 = ms->irq1 = 0;  in mpc52xx_spi_probe()
490 	if (!ms->irq0)  in mpc52xx_spi_probe()
498 	dev_info(&ms->host->dev, "registered MPC5200 SPI bus\n");  in mpc52xx_spi_probe()
503 	dev_err(&ms->host->dev, "initialization failed\n");  in mpc52xx_spi_probe()
506 		gpiod_put(ms->gpio_cs[i]);  in mpc52xx_spi_probe()
508 	kfree(ms->gpio_cs);  in mpc52xx_spi_probe()
520 	struct mpc52xx_spi *ms = spi_controller_get_devdata(host);  in mpc52xx_spi_remove()  local
523 	free_irq(ms->irq0, ms);  in mpc52xx_spi_remove()
524 	free_irq(ms->irq1, ms);  in mpc52xx_spi_remove()
526 	for (i = 0; i < ms->gpio_cs_count; i++)  in mpc52xx_spi_remove()
527 		gpiod_put(ms->gpio_cs[i]);  in mpc52xx_spi_remove()
529 	kfree(ms->gpio_cs);  in mpc52xx_spi_remove()
531 	iounmap(ms->regs);  in mpc52xx_spi_remove()