83 	int (*state)(int irq, struct mpc52xx_spi *ms, u8 status, u8 data);
96 static void mpc52xx_spi_chipsel(struct mpc52xx_spi *ms, int value)  in mpc52xx_spi_chipsel()  argument
100 	if (ms->gpio_cs_count > 0) {  in mpc52xx_spi_chipsel()
101 		cs = ms->message->spi->chip_select;  in mpc52xx_spi_chipsel()
102 		gpio_set_value(ms->gpio_cs[cs], value ? 0 : 1);  in mpc52xx_spi_chipsel()
104 		out_8(ms->regs + SPI_PORTDATA, value ? 0 : 0x08);  in mpc52xx_spi_chipsel()
112 static void mpc52xx_spi_start_transfer(struct mpc52xx_spi *ms)  in mpc52xx_spi_start_transfer()  argument
114 	ms->rx_buf = ms->transfer->rx_buf;  in mpc52xx_spi_start_transfer()
115 	ms->tx_buf = ms->transfer->tx_buf;  in mpc52xx_spi_start_transfer()
116 	ms->len = ms->transfer->len;  in mpc52xx_spi_start_transfer()
119 	if (ms->cs_change)  in mpc52xx_spi_start_transfer()
120 		mpc52xx_spi_chipsel(ms, 1);  in mpc52xx_spi_start_transfer()
121 	ms->cs_change = ms->transfer->cs_change;  in mpc52xx_spi_start_transfer()
124 	ms->wcol_tx_timestamp = get_tbl();  in mpc52xx_spi_start_transfer()
125 	if (ms->tx_buf)  in mpc52xx_spi_start_transfer()
126 		out_8(ms->regs + SPI_DATA, *ms->tx_buf++);  in mpc52xx_spi_start_transfer()
128 		out_8(ms->regs + SPI_DATA, 0);  in mpc52xx_spi_start_transfer()
132 static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms,
134 static int mpc52xx_spi_fsmstate_wait(int irq, struct mpc52xx_spi *ms,
144 mpc52xx_spi_fsmstate_idle(int irq, struct mpc52xx_spi *ms, u8 status, u8 data)  in mpc52xx_spi_fsmstate_idle()  argument
151 		dev_err(&ms->master->dev, "spurious irq, status=0x%.2x\n",  in mpc52xx_spi_fsmstate_idle()
155 	if (list_empty(&ms->queue))  in mpc52xx_spi_fsmstate_idle()
159 	ms->message = list_first_entry(&ms->queue, struct spi_message, queue);  in mpc52xx_spi_fsmstate_idle()
160 	list_del_init(&ms->message->queue);  in mpc52xx_spi_fsmstate_idle()
164 	spi = ms->message->spi;  in mpc52xx_spi_fsmstate_idle()
171 	out_8(ms->regs + SPI_CTRL1, ctrl1);  in mpc52xx_spi_fsmstate_idle()
176 	sppr = ((ms->ipb_freq / ms->message->spi->max_speed_hz) + 1) >> 1;  in mpc52xx_spi_fsmstate_idle()
190 	out_8(ms->regs + SPI_BRR, sppr << 4 | spr); /* Set speed */  in mpc52xx_spi_fsmstate_idle()
192 	ms->cs_change = 1;  in mpc52xx_spi_fsmstate_idle()
193 	ms->transfer = container_of(ms->message->transfers.next,  in mpc52xx_spi_fsmstate_idle()
196 	mpc52xx_spi_start_transfer(ms);  in mpc52xx_spi_fsmstate_idle()
197 	ms->state = mpc52xx_spi_fsmstate_transfer;  in mpc52xx_spi_fsmstate_idle()
210 static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms,  in mpc52xx_spi_fsmstate_transfer()  argument
214 		return ms->irq0 ? FSM_STOP : FSM_POLL;  in mpc52xx_spi_fsmstate_transfer()
224 		ms->wcol_count++;  in mpc52xx_spi_fsmstate_transfer()
225 		ms->wcol_ticks += get_tbl() - ms->wcol_tx_timestamp;  in mpc52xx_spi_fsmstate_transfer()
226 		ms->wcol_tx_timestamp = get_tbl();  in mpc52xx_spi_fsmstate_transfer()
228 		if (ms->tx_buf)  in mpc52xx_spi_fsmstate_transfer()
229 			data = *(ms->tx_buf - 1);  in mpc52xx_spi_fsmstate_transfer()
230 		out_8(ms->regs + SPI_DATA, data); /* try again */  in mpc52xx_spi_fsmstate_transfer()
233 		ms->modf_count++;  in mpc52xx_spi_fsmstate_transfer()
234 		dev_err(&ms->master->dev, "mode fault\n");  in mpc52xx_spi_fsmstate_transfer()
235 		mpc52xx_spi_chipsel(ms, 0);  in mpc52xx_spi_fsmstate_transfer()
236 		ms->message->status = -EIO;  in mpc52xx_spi_fsmstate_transfer()
237 		if (ms->message->complete)  in mpc52xx_spi_fsmstate_transfer()
238 			ms->message->complete(ms->message->context);  in mpc52xx_spi_fsmstate_transfer()
239 		ms->state = mpc52xx_spi_fsmstate_idle;  in mpc52xx_spi_fsmstate_transfer()
244 	ms->byte_count++;  in mpc52xx_spi_fsmstate_transfer()
245 	if (ms->rx_buf)  in mpc52xx_spi_fsmstate_transfer()
246 		*ms->rx_buf++ = data;  in mpc52xx_spi_fsmstate_transfer()
249 	ms->len--;  in mpc52xx_spi_fsmstate_transfer()
250 	if (ms->len == 0) {  in mpc52xx_spi_fsmstate_transfer()
251 		ms->timestamp = get_tbl();  in mpc52xx_spi_fsmstate_transfer()
252 		ms->timestamp += ms->transfer->delay_usecs * tb_ticks_per_usec;  in mpc52xx_spi_fsmstate_transfer()
253 		ms->state = mpc52xx_spi_fsmstate_wait;  in mpc52xx_spi_fsmstate_transfer()
258 	ms->wcol_tx_timestamp = get_tbl();  in mpc52xx_spi_fsmstate_transfer()
259 	if (ms->tx_buf)  in mpc52xx_spi_fsmstate_transfer()
260 		out_8(ms->regs + SPI_DATA, *ms->tx_buf++);  in mpc52xx_spi_fsmstate_transfer()
262 		out_8(ms->regs + SPI_DATA, 0);  in mpc52xx_spi_fsmstate_transfer()
274 mpc52xx_spi_fsmstate_wait(int irq, struct mpc52xx_spi *ms, u8 status, u8 data)  in mpc52xx_spi_fsmstate_wait()  argument
277 		dev_err(&ms->master->dev, "spurious irq, status=0x%.2x\n",  in mpc52xx_spi_fsmstate_wait()
280 	if (((int)get_tbl()) - ms->timestamp < 0)  in mpc52xx_spi_fsmstate_wait()
283 	ms->message->actual_length += ms->transfer->len;  in mpc52xx_spi_fsmstate_wait()
288 	if (ms->transfer->transfer_list.next == &ms->message->transfers) {  in mpc52xx_spi_fsmstate_wait()
289 		ms->msg_count++;  in mpc52xx_spi_fsmstate_wait()
290 		mpc52xx_spi_chipsel(ms, 0);  in mpc52xx_spi_fsmstate_wait()
291 		ms->message->status = 0;  in mpc52xx_spi_fsmstate_wait()
292 		if (ms->message->complete)  in mpc52xx_spi_fsmstate_wait()
293 			ms->message->complete(ms->message->context);  in mpc52xx_spi_fsmstate_wait()
294 		ms->state = mpc52xx_spi_fsmstate_idle;  in mpc52xx_spi_fsmstate_wait()
300 	if (ms->cs_change)  in mpc52xx_spi_fsmstate_wait()
301 		mpc52xx_spi_chipsel(ms, 0);  in mpc52xx_spi_fsmstate_wait()
303 	ms->transfer = container_of(ms->transfer->transfer_list.next,  in mpc52xx_spi_fsmstate_wait()
305 	mpc52xx_spi_start_transfer(ms);  in mpc52xx_spi_fsmstate_wait()
306 	ms->state = mpc52xx_spi_fsmstate_transfer;  in mpc52xx_spi_fsmstate_wait()
315 static void mpc52xx_spi_fsm_process(int irq, struct mpc52xx_spi *ms)  in mpc52xx_spi_fsm_process()  argument
323 		status = in_8(ms->regs + SPI_STATUS);  in mpc52xx_spi_fsm_process()
324 		data = in_8(ms->regs + SPI_DATA);  in mpc52xx_spi_fsm_process()
325 		rc = ms->state(irq, ms, status, data);  in mpc52xx_spi_fsm_process()
329 		schedule_work(&ms->work);  in mpc52xx_spi_fsm_process()
337 	struct mpc52xx_spi *ms = _ms;  in mpc52xx_spi_irq()  local
338 	spin_lock(&ms->lock);  in mpc52xx_spi_irq()
339 	mpc52xx_spi_fsm_process(irq, ms);  in mpc52xx_spi_irq()
340 	spin_unlock(&ms->lock);  in mpc52xx_spi_irq()
349 	struct mpc52xx_spi *ms = container_of(work, struct mpc52xx_spi, work);  in mpc52xx_spi_wq()  local
352 	spin_lock_irqsave(&ms->lock, flags);  in mpc52xx_spi_wq()
353 	mpc52xx_spi_fsm_process(0, ms);  in mpc52xx_spi_wq()
354 	spin_unlock_irqrestore(&ms->lock, flags);  in mpc52xx_spi_wq()
363 	struct mpc52xx_spi *ms = spi_master_get_devdata(spi->master);  in mpc52xx_spi_transfer()  local
369 	spin_lock_irqsave(&ms->lock, flags);  in mpc52xx_spi_transfer()
370 	list_add_tail(&m->queue, &ms->queue);  in mpc52xx_spi_transfer()
371 	spin_unlock_irqrestore(&ms->lock, flags);  in mpc52xx_spi_transfer()
372 	schedule_work(&ms->work);  in mpc52xx_spi_transfer()
383 	struct mpc52xx_spi *ms;  in mpc52xx_spi_probe()  local
417 	master = spi_alloc_master(&op->dev, sizeof *ms);  in mpc52xx_spi_probe()
430 	ms = spi_master_get_devdata(master);  in mpc52xx_spi_probe()
431 	ms->master = master;  in mpc52xx_spi_probe()
432 	ms->regs = regs;  in mpc52xx_spi_probe()
433 	ms->irq0 = irq_of_parse_and_map(op->dev.of_node, 0);  in mpc52xx_spi_probe()
434 	ms->irq1 = irq_of_parse_and_map(op->dev.of_node, 1);  in mpc52xx_spi_probe()
435 	ms->state = mpc52xx_spi_fsmstate_idle;  in mpc52xx_spi_probe()
436 	ms->ipb_freq = mpc5xxx_get_bus_frequency(op->dev.of_node);  in mpc52xx_spi_probe()
437 	ms->gpio_cs_count = of_gpio_count(op->dev.of_node);  in mpc52xx_spi_probe()
438 	if (ms->gpio_cs_count > 0) {  in mpc52xx_spi_probe()
439 		master->num_chipselect = ms->gpio_cs_count;  in mpc52xx_spi_probe()
440 		ms->gpio_cs = kmalloc(ms->gpio_cs_count * sizeof(unsigned int),  in mpc52xx_spi_probe()
442 		if (!ms->gpio_cs) {  in mpc52xx_spi_probe()
447 		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->master->dev, "registered MPC5200 SPI bus\n");  in mpc52xx_spi_probe()
503 	dev_err(&ms->master->dev, "initialization failed\n");  in mpc52xx_spi_probe()
506 		gpio_free(ms->gpio_cs[i]);  in mpc52xx_spi_probe()
508 	kfree(ms->gpio_cs);  in mpc52xx_spi_probe()
520 	struct mpc52xx_spi *ms = spi_master_get_devdata(master);  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 		gpio_free(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()