Lines Matching +full:spi +full:- +full:tx +full:- +full:bus +full:- +full:width
2 * au1550 psc spi controller driver
4 * will not work on au1000, au1100 and au1500 (no full spi controller there)
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 #include <linux/spi/spi.h>
33 #include <linux/spi/spi_bitbang.h>
34 #include <linux/dma-mapping.h>
36 #include <asm/mach-au1x00/au1000.h>
37 #include <asm/mach-au1x00/au1xxx_psc.h>
38 #include <asm/mach-au1x00/au1xxx_dbdma.h>
40 #include <asm/mach-au1x00/au1550_spi.h>
64 const u8 *tx; member
69 int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t);
91 /* we use an 8-bit memory device for dma transfers to/from spi fifo */
109 * compute BRG and DIV bits to setup spi clock based on main input clock rate
119 u32 mainclk_hz = hw->pdata->mainclk_hz; in au1550_spi_baudcfg()
136 brg--; in au1550_spi_baudcfg()
142 hw->regs->psc_spimsk = in au1550_spi_mask_ack_all()
148 hw->regs->psc_spievent = in au1550_spi_mask_ack_all()
159 hw->regs->psc_spipcr = PSC_SPIPCR_RC | PSC_SPIPCR_TC; in au1550_spi_reset_fifos()
162 pcr = hw->regs->psc_spipcr; in au1550_spi_reset_fifos()
168 * dma transfers are used for the most common spi word size of 8-bits
169 * we cannot easily change already set up dma channels' width, so if we wanted
170 * dma support for more than 8-bit words (up to 24 bits), we would need to
171 * setup dma channels from scratch on each spi transfer, based on bits_per_word
172 * instead we have pre set up 8 bit dma channels supporting spi 4 to 8 bits
173 * transfers, and 9 to 24 bits spi transfers will be done in pio irq based mode
176 static void au1550_spi_chipsel(struct spi_device *spi, int value) in au1550_spi_chipsel() argument
178 struct au1550_spi *hw = spi_master_get_devdata(spi->master); in au1550_spi_chipsel()
179 unsigned cspol = spi->mode & SPI_CS_HIGH ? 1 : 0; in au1550_spi_chipsel()
184 if (hw->pdata->deactivate_cs) in au1550_spi_chipsel()
185 hw->pdata->deactivate_cs(hw->pdata, spi->chip_select, in au1550_spi_chipsel()
190 au1550_spi_bits_handlers_set(hw, spi->bits_per_word); in au1550_spi_chipsel()
192 cfg = hw->regs->psc_spicfg; in au1550_spi_chipsel()
194 hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE; in au1550_spi_chipsel()
197 if (spi->mode & SPI_CPOL) in au1550_spi_chipsel()
201 if (spi->mode & SPI_CPHA) in au1550_spi_chipsel()
206 if (spi->mode & SPI_LSB_FIRST) in au1550_spi_chipsel()
211 if (hw->usedma && spi->bits_per_word <= 8) in au1550_spi_chipsel()
216 cfg |= PSC_SPICFG_SET_LEN(spi->bits_per_word); in au1550_spi_chipsel()
220 cfg |= au1550_spi_baudcfg(hw, spi->max_speed_hz); in au1550_spi_chipsel()
222 hw->regs->psc_spicfg = cfg | PSC_SPICFG_DE_ENABLE; in au1550_spi_chipsel()
225 stat = hw->regs->psc_spistat; in au1550_spi_chipsel()
229 if (hw->pdata->activate_cs) in au1550_spi_chipsel()
230 hw->pdata->activate_cs(hw->pdata, spi->chip_select, in au1550_spi_chipsel()
236 static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t) in au1550_spi_setupxfer() argument
238 struct au1550_spi *hw = spi_master_get_devdata(spi->master); in au1550_spi_setupxfer()
242 bpw = spi->bits_per_word; in au1550_spi_setupxfer()
243 hz = spi->max_speed_hz; in au1550_spi_setupxfer()
245 if (t->bits_per_word) in au1550_spi_setupxfer()
246 bpw = t->bits_per_word; in au1550_spi_setupxfer()
247 if (t->speed_hz) in au1550_spi_setupxfer()
248 hz = t->speed_hz; in au1550_spi_setupxfer()
252 dev_err(&spi->dev, "setupxfer: invalid bits_per_word=%d\n", in au1550_spi_setupxfer()
254 return -EINVAL; in au1550_spi_setupxfer()
256 if (hz > spi->max_speed_hz || hz > hw->freq_max || hz < hw->freq_min) { in au1550_spi_setupxfer()
257 dev_err(&spi->dev, "setupxfer: clock rate=%d out of range\n", in au1550_spi_setupxfer()
259 return -EINVAL; in au1550_spi_setupxfer()
262 au1550_spi_bits_handlers_set(hw, spi->bits_per_word); in au1550_spi_setupxfer()
264 cfg = hw->regs->psc_spicfg; in au1550_spi_setupxfer()
266 hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE; in au1550_spi_setupxfer()
269 if (hw->usedma && bpw <= 8) in au1550_spi_setupxfer()
280 hw->regs->psc_spicfg = cfg; in au1550_spi_setupxfer()
285 stat = hw->regs->psc_spistat; in au1550_spi_setupxfer()
295 static int au1550_spi_setup(struct spi_device *spi) in au1550_spi_setup() argument
297 struct au1550_spi *hw = spi_master_get_devdata(spi->master); in au1550_spi_setup()
299 if (spi->bits_per_word < 4 || spi->bits_per_word > 24) { in au1550_spi_setup()
300 dev_err(&spi->dev, "setup: invalid bits_per_word=%d\n", in au1550_spi_setup()
301 spi->bits_per_word); in au1550_spi_setup()
302 return -EINVAL; in au1550_spi_setup()
305 if (spi->max_speed_hz == 0) in au1550_spi_setup()
306 spi->max_speed_hz = hw->freq_max; in au1550_spi_setup()
307 if (spi->max_speed_hz > hw->freq_max in au1550_spi_setup()
308 || spi->max_speed_hz < hw->freq_min) in au1550_spi_setup()
309 return -EINVAL; in au1550_spi_setup()
312 * otherwise sharing of spi bus is not possible, in au1550_spi_setup()
313 * so do not call setupxfer(spi, NULL) here in au1550_spi_setup()
319 * for dma spi transfers, we have to setup rx channel, otherwise there is
320 * no reliable way how to recognize that spi transfer is done
321 * dma complete callbacks are called before real spi transfer is finished
322 * and if only tx dma channel is set up (and rx fifo overflow event masked)
323 * spi master done event irq is not generated unless rx fifo is empty (emptied)
328 hw->dma_rx_tmpbuf = kmalloc(size, GFP_KERNEL); in au1550_spi_dma_rxtmp_alloc()
329 if (!hw->dma_rx_tmpbuf) in au1550_spi_dma_rxtmp_alloc()
330 return -ENOMEM; in au1550_spi_dma_rxtmp_alloc()
331 hw->dma_rx_tmpbuf_size = size; in au1550_spi_dma_rxtmp_alloc()
332 hw->dma_rx_tmpbuf_addr = dma_map_single(hw->dev, hw->dma_rx_tmpbuf, in au1550_spi_dma_rxtmp_alloc()
334 if (dma_mapping_error(hw->dev, hw->dma_rx_tmpbuf_addr)) { in au1550_spi_dma_rxtmp_alloc()
335 kfree(hw->dma_rx_tmpbuf); in au1550_spi_dma_rxtmp_alloc()
336 hw->dma_rx_tmpbuf = 0; in au1550_spi_dma_rxtmp_alloc()
337 hw->dma_rx_tmpbuf_size = 0; in au1550_spi_dma_rxtmp_alloc()
338 return -EFAULT; in au1550_spi_dma_rxtmp_alloc()
345 dma_unmap_single(hw->dev, hw->dma_rx_tmpbuf_addr, in au1550_spi_dma_rxtmp_free()
346 hw->dma_rx_tmpbuf_size, DMA_FROM_DEVICE); in au1550_spi_dma_rxtmp_free()
347 kfree(hw->dma_rx_tmpbuf); in au1550_spi_dma_rxtmp_free()
348 hw->dma_rx_tmpbuf = 0; in au1550_spi_dma_rxtmp_free()
349 hw->dma_rx_tmpbuf_size = 0; in au1550_spi_dma_rxtmp_free()
352 static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t) in au1550_spi_dma_txrxb() argument
354 struct au1550_spi *hw = spi_master_get_devdata(spi->master); in au1550_spi_dma_txrxb()
359 hw->len = t->len; in au1550_spi_dma_txrxb()
360 hw->tx_count = 0; in au1550_spi_dma_txrxb()
361 hw->rx_count = 0; in au1550_spi_dma_txrxb()
363 hw->tx = t->tx_buf; in au1550_spi_dma_txrxb()
364 hw->rx = t->rx_buf; in au1550_spi_dma_txrxb()
365 dma_tx_addr = t->tx_dma; in au1550_spi_dma_txrxb()
366 dma_rx_addr = t->rx_dma; in au1550_spi_dma_txrxb()
370 * - first map the TX buffer, so cache data gets written to memory in au1550_spi_dma_txrxb()
371 * - then map the RX buffer, so that cache entries (with in au1550_spi_dma_txrxb()
372 * soon-to-be-stale data) get removed in au1550_spi_dma_txrxb()
373 * use rx buffer in place of tx if tx buffer was not provided in au1550_spi_dma_txrxb()
376 if (t->tx_buf) { in au1550_spi_dma_txrxb()
377 if (t->tx_dma == 0) { /* if DMA_ADDR_INVALID, map it */ in au1550_spi_dma_txrxb()
378 dma_tx_addr = dma_map_single(hw->dev, in au1550_spi_dma_txrxb()
379 (void *)t->tx_buf, in au1550_spi_dma_txrxb()
380 t->len, DMA_TO_DEVICE); in au1550_spi_dma_txrxb()
381 if (dma_mapping_error(hw->dev, dma_tx_addr)) in au1550_spi_dma_txrxb()
382 dev_err(hw->dev, "tx dma map error\n"); in au1550_spi_dma_txrxb()
386 if (t->rx_buf) { in au1550_spi_dma_txrxb()
387 if (t->rx_dma == 0) { /* if DMA_ADDR_INVALID, map it */ in au1550_spi_dma_txrxb()
388 dma_rx_addr = dma_map_single(hw->dev, in au1550_spi_dma_txrxb()
389 (void *)t->rx_buf, in au1550_spi_dma_txrxb()
390 t->len, DMA_FROM_DEVICE); in au1550_spi_dma_txrxb()
391 if (dma_mapping_error(hw->dev, dma_rx_addr)) in au1550_spi_dma_txrxb()
392 dev_err(hw->dev, "rx dma map error\n"); in au1550_spi_dma_txrxb()
395 if (t->len > hw->dma_rx_tmpbuf_size) { in au1550_spi_dma_txrxb()
399 ret = au1550_spi_dma_rxtmp_alloc(hw, max(t->len, in au1550_spi_dma_txrxb()
404 hw->rx = hw->dma_rx_tmpbuf; in au1550_spi_dma_txrxb()
405 dma_rx_addr = hw->dma_rx_tmpbuf_addr; in au1550_spi_dma_txrxb()
406 dma_sync_single_for_device(hw->dev, dma_rx_addr, in au1550_spi_dma_txrxb()
407 t->len, DMA_FROM_DEVICE); in au1550_spi_dma_txrxb()
410 if (!t->tx_buf) { in au1550_spi_dma_txrxb()
411 dma_sync_single_for_device(hw->dev, dma_rx_addr, in au1550_spi_dma_txrxb()
412 t->len, DMA_BIDIRECTIONAL); in au1550_spi_dma_txrxb()
413 hw->tx = hw->rx; in au1550_spi_dma_txrxb()
417 res = au1xxx_dbdma_put_dest(hw->dma_rx_ch, virt_to_phys(hw->rx), in au1550_spi_dma_txrxb()
418 t->len, DDMA_FLAGS_IE); in au1550_spi_dma_txrxb()
420 dev_err(hw->dev, "rx dma put dest error\n"); in au1550_spi_dma_txrxb()
422 res = au1xxx_dbdma_put_source(hw->dma_tx_ch, virt_to_phys(hw->tx), in au1550_spi_dma_txrxb()
423 t->len, DDMA_FLAGS_IE); in au1550_spi_dma_txrxb()
425 dev_err(hw->dev, "tx dma put source error\n"); in au1550_spi_dma_txrxb()
427 au1xxx_dbdma_start(hw->dma_rx_ch); in au1550_spi_dma_txrxb()
428 au1xxx_dbdma_start(hw->dma_tx_ch); in au1550_spi_dma_txrxb()
431 hw->regs->psc_spimsk = PSC_SPIMSK_SD; in au1550_spi_dma_txrxb()
435 hw->regs->psc_spipcr = PSC_SPIPCR_MS; in au1550_spi_dma_txrxb()
438 wait_for_completion(&hw->master_done); in au1550_spi_dma_txrxb()
440 au1xxx_dbdma_stop(hw->dma_tx_ch); in au1550_spi_dma_txrxb()
441 au1xxx_dbdma_stop(hw->dma_rx_ch); in au1550_spi_dma_txrxb()
443 if (!t->rx_buf) { in au1550_spi_dma_txrxb()
445 dma_sync_single_for_cpu(hw->dev, dma_rx_addr, t->len, in au1550_spi_dma_txrxb()
449 if (t->rx_buf && t->rx_dma == 0 ) in au1550_spi_dma_txrxb()
450 dma_unmap_single(hw->dev, dma_rx_addr, t->len, in au1550_spi_dma_txrxb()
452 if (t->tx_buf && t->tx_dma == 0 ) in au1550_spi_dma_txrxb()
453 dma_unmap_single(hw->dev, dma_tx_addr, t->len, in au1550_spi_dma_txrxb()
456 return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count; in au1550_spi_dma_txrxb()
463 stat = hw->regs->psc_spistat; in au1550_spi_dma_irq_callback()
464 evnt = hw->regs->psc_spievent; in au1550_spi_dma_irq_callback()
467 dev_err(hw->dev, "Unexpected IRQ!\n"); in au1550_spi_dma_irq_callback()
476 * due to an spi error we consider transfer as done, in au1550_spi_dma_irq_callback()
481 au1xxx_dbdma_stop(hw->dma_rx_ch); in au1550_spi_dma_irq_callback()
482 au1xxx_dbdma_stop(hw->dma_tx_ch); in au1550_spi_dma_irq_callback()
485 hw->rx_count = hw->len - au1xxx_get_dma_residue(hw->dma_rx_ch); in au1550_spi_dma_irq_callback()
486 hw->tx_count = hw->len - au1xxx_get_dma_residue(hw->dma_tx_ch); in au1550_spi_dma_irq_callback()
488 au1xxx_dbdma_reset(hw->dma_rx_ch); in au1550_spi_dma_irq_callback()
489 au1xxx_dbdma_reset(hw->dma_tx_ch); in au1550_spi_dma_irq_callback()
493 dev_err(hw->dev, in au1550_spi_dma_irq_callback()
496 dev_err(hw->dev, in au1550_spi_dma_irq_callback()
497 "dma transfer: unexpected SPI error " in au1550_spi_dma_irq_callback()
500 complete(&hw->master_done); in au1550_spi_dma_irq_callback()
507 hw->rx_count = hw->len; in au1550_spi_dma_irq_callback()
508 hw->tx_count = hw->len; in au1550_spi_dma_irq_callback()
509 complete(&hw->master_done); in au1550_spi_dma_irq_callback()
519 u32 fifoword = hw->regs->psc_spitxrx & (u32)(mask); \
521 if (hw->rx) { \
522 *(u##size *)hw->rx = (u##size)fifoword; \
523 hw->rx += (size) / 8; \
525 hw->rx_count += (size) / 8; \
532 if (hw->tx) { \
533 fifoword = *(u##size *)hw->tx & (u32)(mask); \
534 hw->tx += (size) / 8; \
536 hw->tx_count += (size) / 8; \
537 if (hw->tx_count >= hw->len) \
539 hw->regs->psc_spitxrx = fifoword; \
550 static int au1550_spi_pio_txrxb(struct spi_device *spi, struct spi_transfer *t) in au1550_spi_pio_txrxb() argument
553 struct au1550_spi *hw = spi_master_get_devdata(spi->master); in au1550_spi_pio_txrxb()
555 hw->tx = t->tx_buf; in au1550_spi_pio_txrxb()
556 hw->rx = t->rx_buf; in au1550_spi_pio_txrxb()
557 hw->len = t->len; in au1550_spi_pio_txrxb()
558 hw->tx_count = 0; in au1550_spi_pio_txrxb()
559 hw->rx_count = 0; in au1550_spi_pio_txrxb()
561 /* by default enable nearly all events after filling tx fifo */ in au1550_spi_pio_txrxb()
565 while (hw->tx_count < hw->len) { in au1550_spi_pio_txrxb()
567 hw->tx_word(hw); in au1550_spi_pio_txrxb()
569 if (hw->tx_count >= hw->len) { in au1550_spi_pio_txrxb()
570 /* mask tx fifo request interrupt as we are done */ in au1550_spi_pio_txrxb()
574 stat = hw->regs->psc_spistat; in au1550_spi_pio_txrxb()
581 hw->regs->psc_spimsk = mask; in au1550_spi_pio_txrxb()
585 hw->regs->psc_spipcr = PSC_SPIPCR_MS; in au1550_spi_pio_txrxb()
588 wait_for_completion(&hw->master_done); in au1550_spi_pio_txrxb()
590 return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count; in au1550_spi_pio_txrxb()
598 stat = hw->regs->psc_spistat; in au1550_spi_pio_irq_callback()
599 evnt = hw->regs->psc_spievent; in au1550_spi_pio_irq_callback()
602 dev_err(hw->dev, "Unexpected IRQ!\n"); in au1550_spi_pio_irq_callback()
616 dev_err(hw->dev, in au1550_spi_pio_irq_callback()
617 "pio transfer: unexpected SPI error " in au1550_spi_pio_irq_callback()
619 complete(&hw->master_done); in au1550_spi_pio_irq_callback()
625 * or there is a space to write to tx fifo: in au1550_spi_pio_irq_callback()
629 stat = hw->regs->psc_spistat; in au1550_spi_pio_irq_callback()
641 if (!(stat & PSC_SPISTAT_RE) && hw->rx_count < hw->len) { in au1550_spi_pio_irq_callback()
642 hw->rx_word(hw); in au1550_spi_pio_irq_callback()
645 if (!(stat & PSC_SPISTAT_TF) && hw->tx_count < hw->len) in au1550_spi_pio_irq_callback()
646 hw->tx_word(hw); in au1550_spi_pio_irq_callback()
650 hw->regs->psc_spievent = PSC_SPIEVNT_RR | PSC_SPIEVNT_TR; in au1550_spi_pio_irq_callback()
654 * Restart the SPI transmission in case of a transmit underflow. in au1550_spi_pio_irq_callback()
656 * of Figure 8-4 with flowchart for SPI master operation: in au1550_spi_pio_irq_callback()
659 * for any of the following events: Tx FIFO Underflow, in au1550_spi_pio_irq_callback()
660 * Rx FIFO Overflow, or Multiple-master Error in au1550_spi_pio_irq_callback()
661 * Note 2: In case of a Tx Underflow Error, all zeroes are in au1550_spi_pio_irq_callback()
664 * By simply restarting the spi transfer on Tx Underflow Error, in au1550_spi_pio_irq_callback()
665 * we assume that spi transfer was paused instead of zeroes in au1550_spi_pio_irq_callback()
669 hw->regs->psc_spievent = PSC_SPIEVNT_TU | PSC_SPIEVNT_MD; in au1550_spi_pio_irq_callback()
671 hw->regs->psc_spipcr = PSC_SPIPCR_MS; in au1550_spi_pio_irq_callback()
675 if (hw->rx_count >= hw->len) { in au1550_spi_pio_irq_callback()
678 complete(&hw->master_done); in au1550_spi_pio_irq_callback()
683 static int au1550_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) in au1550_spi_txrx_bufs() argument
685 struct au1550_spi *hw = spi_master_get_devdata(spi->master); in au1550_spi_txrx_bufs()
686 return hw->txrx_bufs(spi, t); in au1550_spi_txrx_bufs()
692 return hw->irq_callback(hw); in au1550_spi_irq()
698 if (hw->usedma) { in au1550_spi_bits_handlers_set()
699 hw->txrx_bufs = &au1550_spi_dma_txrxb; in au1550_spi_bits_handlers_set()
700 hw->irq_callback = &au1550_spi_dma_irq_callback; in au1550_spi_bits_handlers_set()
702 hw->rx_word = &au1550_spi_rx_word_8; in au1550_spi_bits_handlers_set()
703 hw->tx_word = &au1550_spi_tx_word_8; in au1550_spi_bits_handlers_set()
704 hw->txrx_bufs = &au1550_spi_pio_txrxb; in au1550_spi_bits_handlers_set()
705 hw->irq_callback = &au1550_spi_pio_irq_callback; in au1550_spi_bits_handlers_set()
708 hw->rx_word = &au1550_spi_rx_word_16; in au1550_spi_bits_handlers_set()
709 hw->tx_word = &au1550_spi_tx_word_16; in au1550_spi_bits_handlers_set()
710 hw->txrx_bufs = &au1550_spi_pio_txrxb; in au1550_spi_bits_handlers_set()
711 hw->irq_callback = &au1550_spi_pio_irq_callback; in au1550_spi_bits_handlers_set()
713 hw->rx_word = &au1550_spi_rx_word_32; in au1550_spi_bits_handlers_set()
714 hw->tx_word = &au1550_spi_tx_word_32; in au1550_spi_bits_handlers_set()
715 hw->txrx_bufs = &au1550_spi_pio_txrxb; in au1550_spi_bits_handlers_set()
716 hw->irq_callback = &au1550_spi_pio_irq_callback; in au1550_spi_bits_handlers_set()
724 /* set up the PSC for SPI mode */ in au1550_spi_setup_psc_as_spi()
725 hw->regs->psc_ctrl = PSC_CTRL_DISABLE; in au1550_spi_setup_psc_as_spi()
727 hw->regs->psc_sel = PSC_SEL_PS_SPIMODE; in au1550_spi_setup_psc_as_spi()
730 hw->regs->psc_spicfg = 0; in au1550_spi_setup_psc_as_spi()
733 hw->regs->psc_ctrl = PSC_CTRL_ENABLE; in au1550_spi_setup_psc_as_spi()
737 stat = hw->regs->psc_spistat; in au1550_spi_setup_psc_as_spi()
742 cfg = hw->usedma ? 0 : PSC_SPICFG_DD_DISABLE; in au1550_spi_setup_psc_as_spi()
752 hw->regs->psc_spicfg = cfg; in au1550_spi_setup_psc_as_spi()
757 hw->regs->psc_spicfg |= PSC_SPICFG_DE_ENABLE; in au1550_spi_setup_psc_as_spi()
761 stat = hw->regs->psc_spistat; in au1550_spi_setup_psc_as_spi()
776 master = spi_alloc_master(&pdev->dev, sizeof(struct au1550_spi)); in au1550_spi_probe()
778 dev_err(&pdev->dev, "No memory for spi_master\n"); in au1550_spi_probe()
779 err = -ENOMEM; in au1550_spi_probe()
783 /* the spi->mode bits understood by this driver: */ in au1550_spi_probe()
784 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; in au1550_spi_probe()
788 hw->master = spi_master_get(master); in au1550_spi_probe()
789 hw->pdata = pdev->dev.platform_data; in au1550_spi_probe()
790 hw->dev = &pdev->dev; in au1550_spi_probe()
792 if (hw->pdata == NULL) { in au1550_spi_probe()
793 dev_err(&pdev->dev, "No platform data supplied\n"); in au1550_spi_probe()
794 err = -ENOENT; in au1550_spi_probe()
800 dev_err(&pdev->dev, "no IRQ\n"); in au1550_spi_probe()
801 err = -ENODEV; in au1550_spi_probe()
804 hw->irq = r->start; in au1550_spi_probe()
806 hw->usedma = 0; in au1550_spi_probe()
809 hw->dma_tx_id = r->start; in au1550_spi_probe()
812 hw->dma_rx_id = r->start; in au1550_spi_probe()
814 if (pdev->dev.dma_mask == NULL) in au1550_spi_probe()
815 dev_warn(&pdev->dev, "no dma mask\n"); in au1550_spi_probe()
817 hw->usedma = 1; in au1550_spi_probe()
824 dev_err(&pdev->dev, "no mmio resource\n"); in au1550_spi_probe()
825 err = -ENODEV; in au1550_spi_probe()
829 hw->ioarea = request_mem_region(r->start, sizeof(psc_spi_t), in au1550_spi_probe()
830 pdev->name); in au1550_spi_probe()
831 if (!hw->ioarea) { in au1550_spi_probe()
832 dev_err(&pdev->dev, "Cannot reserve iomem region\n"); in au1550_spi_probe()
833 err = -ENXIO; in au1550_spi_probe()
837 hw->regs = (psc_spi_t __iomem *)ioremap(r->start, sizeof(psc_spi_t)); in au1550_spi_probe()
838 if (!hw->regs) { in au1550_spi_probe()
839 dev_err(&pdev->dev, "cannot ioremap\n"); in au1550_spi_probe()
840 err = -ENXIO; in au1550_spi_probe()
846 init_completion(&hw->master_done); in au1550_spi_probe()
848 hw->bitbang.master = hw->master; in au1550_spi_probe()
849 hw->bitbang.setup_transfer = au1550_spi_setupxfer; in au1550_spi_probe()
850 hw->bitbang.chipselect = au1550_spi_chipsel; in au1550_spi_probe()
851 hw->bitbang.master->setup = au1550_spi_setup; in au1550_spi_probe()
852 hw->bitbang.txrx_bufs = au1550_spi_txrx_bufs; in au1550_spi_probe()
854 if (hw->usedma) { in au1550_spi_probe()
855 hw->dma_tx_ch = au1xxx_dbdma_chan_alloc(ddma_memid, in au1550_spi_probe()
856 hw->dma_tx_id, NULL, (void *)hw); in au1550_spi_probe()
857 if (hw->dma_tx_ch == 0) { in au1550_spi_probe()
858 dev_err(&pdev->dev, in au1550_spi_probe()
859 "Cannot allocate tx dma channel\n"); in au1550_spi_probe()
860 err = -ENXIO; in au1550_spi_probe()
863 au1xxx_dbdma_set_devwidth(hw->dma_tx_ch, 8); in au1550_spi_probe()
864 if (au1xxx_dbdma_ring_alloc(hw->dma_tx_ch, in au1550_spi_probe()
866 dev_err(&pdev->dev, in au1550_spi_probe()
867 "Cannot allocate tx dma descriptors\n"); in au1550_spi_probe()
868 err = -ENXIO; in au1550_spi_probe()
873 hw->dma_rx_ch = au1xxx_dbdma_chan_alloc(hw->dma_rx_id, in au1550_spi_probe()
875 if (hw->dma_rx_ch == 0) { in au1550_spi_probe()
876 dev_err(&pdev->dev, in au1550_spi_probe()
878 err = -ENXIO; in au1550_spi_probe()
881 au1xxx_dbdma_set_devwidth(hw->dma_rx_ch, 8); in au1550_spi_probe()
882 if (au1xxx_dbdma_ring_alloc(hw->dma_rx_ch, in au1550_spi_probe()
884 dev_err(&pdev->dev, in au1550_spi_probe()
886 err = -ENXIO; in au1550_spi_probe()
893 dev_err(&pdev->dev, in au1550_spi_probe()
901 err = request_irq(hw->irq, au1550_spi_irq, 0, pdev->name, hw); in au1550_spi_probe()
903 dev_err(&pdev->dev, "Cannot claim IRQ\n"); in au1550_spi_probe()
907 master->bus_num = pdev->id; in au1550_spi_probe()
908 master->num_chipselect = hw->pdata->num_chipselect; in au1550_spi_probe()
911 * precompute valid range for spi freq - from au1550 datasheet: in au1550_spi_probe()
922 hw->freq_max = hw->pdata->mainclk_hz / min_div; in au1550_spi_probe()
923 hw->freq_min = hw->pdata->mainclk_hz / (max_div + 1) + 1; in au1550_spi_probe()
928 err = spi_bitbang_start(&hw->bitbang); in au1550_spi_probe()
930 dev_err(&pdev->dev, "Failed to register SPI master\n"); in au1550_spi_probe()
934 dev_info(&pdev->dev, in au1550_spi_probe()
935 "spi master registered: bus_num=%d num_chipselect=%d\n", in au1550_spi_probe()
936 master->bus_num, master->num_chipselect); in au1550_spi_probe()
941 free_irq(hw->irq, hw); in au1550_spi_probe()
948 if (hw->usedma) in au1550_spi_probe()
949 au1xxx_dbdma_chan_free(hw->dma_rx_ch); in au1550_spi_probe()
953 if (hw->usedma) in au1550_spi_probe()
954 au1xxx_dbdma_chan_free(hw->dma_tx_ch); in au1550_spi_probe()
957 iounmap((void __iomem *)hw->regs); in au1550_spi_probe()
960 release_resource(hw->ioarea); in au1550_spi_probe()
961 kfree(hw->ioarea); in au1550_spi_probe()
965 spi_master_put(hw->master); in au1550_spi_probe()
975 dev_info(&pdev->dev, "spi master remove: bus_num=%d\n", in au1550_spi_remove()
976 hw->master->bus_num); in au1550_spi_remove()
978 spi_bitbang_stop(&hw->bitbang); in au1550_spi_remove()
979 free_irq(hw->irq, hw); in au1550_spi_remove()
980 iounmap((void __iomem *)hw->regs); in au1550_spi_remove()
981 release_resource(hw->ioarea); in au1550_spi_remove()
982 kfree(hw->ioarea); in au1550_spi_remove()
984 if (hw->usedma) { in au1550_spi_remove()
986 au1xxx_dbdma_chan_free(hw->dma_rx_ch); in au1550_spi_remove()
987 au1xxx_dbdma_chan_free(hw->dma_tx_ch); in au1550_spi_remove()
992 spi_master_put(hw->master); in au1550_spi_remove()
997 MODULE_ALIAS("platform:au1550-spi");
1002 .name = "au1550-spi",
1011 * needed for proper byte ordering to spi fifo in au1550_spi_init()
1016 printk(KERN_ERR "au1550-spi: cannot add memory" in au1550_spi_init()
1031 MODULE_DESCRIPTION("Au1550 PSC SPI Driver");