Lines Matching +full:spi +full:- +full:rx +full:- +full:delay +full:- +full:us
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * MPC512x PSC in SPI mode driver.
7 * Hongjun Chen <hong-jun.chen@freescale.com>
22 #include <linux/delay.h>
24 #include <linux/spi/spi.h>
40 switch (mps->type) { \
42 struct mpc52xx_psc __iomem *psc = mps->psc; \
43 __ret = &psc->regname; \
47 struct mpc5125_psc __iomem *psc = mps->psc; \
48 __ret = &psc->regname; \
55 void (*cs_control)(struct spi_device *spi, bool on);
79 static int mpc512x_psc_spi_transfer_setup(struct spi_device *spi, in mpc512x_psc_spi_transfer_setup() argument
82 struct mpc512x_psc_spi_cs *cs = spi->controller_state; in mpc512x_psc_spi_transfer_setup()
84 cs->speed_hz = (t && t->speed_hz) in mpc512x_psc_spi_transfer_setup()
85 ? t->speed_hz : spi->max_speed_hz; in mpc512x_psc_spi_transfer_setup()
86 cs->bits_per_word = (t && t->bits_per_word) in mpc512x_psc_spi_transfer_setup()
87 ? t->bits_per_word : spi->bits_per_word; in mpc512x_psc_spi_transfer_setup()
88 cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8; in mpc512x_psc_spi_transfer_setup()
92 static void mpc512x_psc_spi_activate_cs(struct spi_device *spi) in mpc512x_psc_spi_activate_cs() argument
94 struct mpc512x_psc_spi_cs *cs = spi->controller_state; in mpc512x_psc_spi_activate_cs()
95 struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); in mpc512x_psc_spi_activate_cs()
104 if (spi->mode & SPI_CPHA) in mpc512x_psc_spi_activate_cs()
109 if (spi->mode & SPI_CPOL) in mpc512x_psc_spi_activate_cs()
114 if (spi->mode & SPI_LSB_FIRST) in mpc512x_psc_spi_activate_cs()
122 speed = cs->speed_hz; in mpc512x_psc_spi_activate_cs()
125 bclkdiv = (mps->mclk_rate / speed) - 1; in mpc512x_psc_spi_activate_cs()
129 mps->bits_per_word = cs->bits_per_word; in mpc512x_psc_spi_activate_cs()
131 if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) in mpc512x_psc_spi_activate_cs()
132 mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0); in mpc512x_psc_spi_activate_cs()
135 static void mpc512x_psc_spi_deactivate_cs(struct spi_device *spi) in mpc512x_psc_spi_deactivate_cs() argument
137 struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); in mpc512x_psc_spi_deactivate_cs()
139 if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) in mpc512x_psc_spi_deactivate_cs()
140 mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1); in mpc512x_psc_spi_deactivate_cs()
149 static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, in mpc512x_psc_spi_transfer_rxtx() argument
152 struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); in mpc512x_psc_spi_transfer_rxtx()
153 struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; in mpc512x_psc_spi_transfer_rxtx()
154 size_t tx_len = t->len; in mpc512x_psc_spi_transfer_rxtx()
155 size_t rx_len = t->len; in mpc512x_psc_spi_transfer_rxtx()
156 u8 *tx_buf = (u8 *)t->tx_buf; in mpc512x_psc_spi_transfer_rxtx()
157 u8 *rx_buf = (u8 *)t->rx_buf; in mpc512x_psc_spi_transfer_rxtx()
159 if (!tx_buf && !rx_buf && t->len) in mpc512x_psc_spi_transfer_rxtx()
160 return -EINVAL; in mpc512x_psc_spi_transfer_rxtx()
171 * but neither exceed the TX nor the RX FIFOs in mpc512x_psc_spi_transfer_rxtx()
173 fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->txsz)); in mpc512x_psc_spi_transfer_rxtx()
175 fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->rxsz)); in mpc512x_psc_spi_transfer_rxtx()
176 fifosz -= in_be32(&fifo->rxcnt) + 1; in mpc512x_psc_spi_transfer_rxtx()
181 while (txcount-- > 0) { in mpc512x_psc_spi_transfer_rxtx()
183 if (tx_len == EOFBYTE && t->cs_change) in mpc512x_psc_spi_transfer_rxtx()
184 setbits32(&fifo->txcmd, in mpc512x_psc_spi_transfer_rxtx()
186 out_8(&fifo->txdata_8, data); in mpc512x_psc_spi_transfer_rxtx()
187 tx_len--; in mpc512x_psc_spi_transfer_rxtx()
191 reinit_completion(&mps->txisrdone); in mpc512x_psc_spi_transfer_rxtx()
192 out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); in mpc512x_psc_spi_transfer_rxtx()
193 out_be32(&fifo->tximr, MPC512x_PSC_FIFO_EMPTY); in mpc512x_psc_spi_transfer_rxtx()
194 wait_for_completion(&mps->txisrdone); in mpc512x_psc_spi_transfer_rxtx()
198 * consume as much RX data as the FIFO holds, while we in mpc512x_psc_spi_transfer_rxtx()
201 * only insist in draining all the remaining RX bytes in mpc512x_psc_spi_transfer_rxtx()
212 * the FIFO while we read from it -- we'll return in mpc512x_psc_spi_transfer_rxtx()
216 fifosz = in_be32(&fifo->rxcnt); in mpc512x_psc_spi_transfer_rxtx()
218 while (rxcount-- > 0) { in mpc512x_psc_spi_transfer_rxtx()
219 data = in_8(&fifo->rxdata_8); in mpc512x_psc_spi_transfer_rxtx()
222 rx_len--; in mpc512x_psc_spi_transfer_rxtx()
227 * bail out of the RX drain loop if all of the TX data in mpc512x_psc_spi_transfer_rxtx()
228 * was sent and all of the RX data was received (i.e. in mpc512x_psc_spi_transfer_rxtx()
237 * TX data transmission has completed while RX data in mpc512x_psc_spi_transfer_rxtx()
238 * is still pending -- that's a transient situation in mpc512x_psc_spi_transfer_rxtx()
244 * too long when running SPI at low speed in mpc512x_psc_spi_transfer_rxtx()
249 * times 10us and thus work at speeds as low as in mpc512x_psc_spi_transfer_rxtx()
252 * ticks in the system _and_ RX data still wasn't in mpc512x_psc_spi_transfer_rxtx()
259 * unknown inner delay in mpc512x_psc_spi_transfer_rxtx()
263 } while (--rxtries > 0); in mpc512x_psc_spi_transfer_rxtx()
266 * not enough RX bytes even after several retries in mpc512x_psc_spi_transfer_rxtx()
269 rxcount = in_be32(&fifo->rxcnt); in mpc512x_psc_spi_transfer_rxtx()
270 dev_warn(&spi->dev, in mpc512x_psc_spi_transfer_rxtx()
271 "short xfer, missing %zd RX bytes, FIFO level %zd\n", in mpc512x_psc_spi_transfer_rxtx()
276 * drain and drop RX data which "should not be there" in in mpc512x_psc_spi_transfer_rxtx()
281 while (in_be32(&fifo->rxcnt)) in mpc512x_psc_spi_transfer_rxtx()
282 in_8(&fifo->rxdata_8); in mpc512x_psc_spi_transfer_rxtx()
292 struct spi_device *spi; in mpc512x_psc_spi_msg_xfer() local
297 spi = m->spi; in mpc512x_psc_spi_msg_xfer()
300 list_for_each_entry(t, &m->transfers, transfer_list) { in mpc512x_psc_spi_msg_xfer()
301 status = mpc512x_psc_spi_transfer_setup(spi, t); in mpc512x_psc_spi_msg_xfer()
306 mpc512x_psc_spi_activate_cs(spi); in mpc512x_psc_spi_msg_xfer()
307 cs_change = t->cs_change; in mpc512x_psc_spi_msg_xfer()
309 status = mpc512x_psc_spi_transfer_rxtx(spi, t); in mpc512x_psc_spi_msg_xfer()
312 m->actual_length += t->len; in mpc512x_psc_spi_msg_xfer()
317 mpc512x_psc_spi_deactivate_cs(spi); in mpc512x_psc_spi_msg_xfer()
320 m->status = status; in mpc512x_psc_spi_msg_xfer()
321 if (m->complete) in mpc512x_psc_spi_msg_xfer()
322 m->complete(m->context); in mpc512x_psc_spi_msg_xfer()
325 mpc512x_psc_spi_deactivate_cs(spi); in mpc512x_psc_spi_msg_xfer()
327 mpc512x_psc_spi_transfer_setup(spi, NULL); in mpc512x_psc_spi_msg_xfer()
337 dev_dbg(&master->dev, "%s()\n", __func__); in mpc512x_psc_spi_prep_xfer_hw()
352 struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; in mpc512x_psc_spi_unprep_xfer_hw()
354 dev_dbg(&master->dev, "%s()\n", __func__); in mpc512x_psc_spi_unprep_xfer_hw()
358 out_be32(&fifo->tximr, 0); in mpc512x_psc_spi_unprep_xfer_hw()
363 static int mpc512x_psc_spi_setup(struct spi_device *spi) in mpc512x_psc_spi_setup() argument
365 struct mpc512x_psc_spi_cs *cs = spi->controller_state; in mpc512x_psc_spi_setup()
368 if (spi->bits_per_word % 8) in mpc512x_psc_spi_setup()
369 return -EINVAL; in mpc512x_psc_spi_setup()
374 return -ENOMEM; in mpc512x_psc_spi_setup()
376 if (gpio_is_valid(spi->cs_gpio)) { in mpc512x_psc_spi_setup()
377 ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev)); in mpc512x_psc_spi_setup()
379 dev_err(&spi->dev, "can't get CS gpio: %d\n", in mpc512x_psc_spi_setup()
384 gpio_direction_output(spi->cs_gpio, in mpc512x_psc_spi_setup()
385 spi->mode & SPI_CS_HIGH ? 0 : 1); in mpc512x_psc_spi_setup()
388 spi->controller_state = cs; in mpc512x_psc_spi_setup()
391 cs->bits_per_word = spi->bits_per_word; in mpc512x_psc_spi_setup()
392 cs->speed_hz = spi->max_speed_hz; in mpc512x_psc_spi_setup()
397 static void mpc512x_psc_spi_cleanup(struct spi_device *spi) in mpc512x_psc_spi_cleanup() argument
399 if (gpio_is_valid(spi->cs_gpio)) in mpc512x_psc_spi_cleanup()
400 gpio_free(spi->cs_gpio); in mpc512x_psc_spi_cleanup()
401 kfree(spi->controller_state); in mpc512x_psc_spi_cleanup()
407 struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; in mpc512x_psc_spi_port_config()
422 out_be32(&fifo->tximr, 0); in mpc512x_psc_spi_port_config()
423 out_be32(&fifo->rximr, 0); in mpc512x_psc_spi_port_config()
426 /*out_be32(&fifo->txsz, 0x0fe00004);*/ in mpc512x_psc_spi_port_config()
427 /*out_be32(&fifo->rxsz, 0x0ff00004);*/ in mpc512x_psc_spi_port_config()
429 sicr = 0x01000000 | /* SIM = 0001 -- 8 bit */ in mpc512x_psc_spi_port_config()
430 0x00800000 | /* GenClk = 1 -- internal clk */ in mpc512x_psc_spi_port_config()
431 0x00008000 | /* SPI = 1 */ in mpc512x_psc_spi_port_config()
432 0x00004000 | /* MSTR = 1 -- SPI master */ in mpc512x_psc_spi_port_config()
433 0x00000800; /* UseEOF = 1 -- SS low until EOF */ in mpc512x_psc_spi_port_config()
440 bclkdiv = (mps->mclk_rate / speed) - 1; in mpc512x_psc_spi_port_config()
444 /* Set 2ms DTL delay */ in mpc512x_psc_spi_port_config()
449 out_be32(&fifo->rxalarm, 0xfff); in mpc512x_psc_spi_port_config()
450 out_be32(&fifo->txalarm, 0); in mpc512x_psc_spi_port_config()
452 /* Enable FIFO slices for Rx/Tx */ in mpc512x_psc_spi_port_config()
453 out_be32(&fifo->rxcmd, in mpc512x_psc_spi_port_config()
455 out_be32(&fifo->txcmd, in mpc512x_psc_spi_port_config()
458 mps->bits_per_word = 8; in mpc512x_psc_spi_port_config()
466 struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; in mpc512x_psc_spi_isr()
468 /* clear interrupt and wake up the rx/tx routine */ in mpc512x_psc_spi_isr()
469 if (in_be32(&fifo->txisr) & in mpc512x_psc_spi_isr()
470 in_be32(&fifo->tximr) & MPC512x_PSC_FIFO_EMPTY) { in mpc512x_psc_spi_isr()
471 out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); in mpc512x_psc_spi_isr()
472 out_be32(&fifo->tximr, 0); in mpc512x_psc_spi_isr()
473 complete(&mps->txisrdone); in mpc512x_psc_spi_isr()
479 static void mpc512x_spi_cs_control(struct spi_device *spi, bool onoff) in mpc512x_spi_cs_control() argument
481 gpio_set_value(spi->cs_gpio, onoff); in mpc512x_spi_cs_control()
496 return -ENOMEM; in mpc512x_psc_spi_do_probe()
500 mps->type = (int)of_device_get_match_data(dev); in mpc512x_psc_spi_do_probe()
501 mps->irq = irq; in mpc512x_psc_spi_do_probe()
504 mps->cs_control = mpc512x_spi_cs_control; in mpc512x_psc_spi_do_probe()
506 mps->cs_control = pdata->cs_control; in mpc512x_psc_spi_do_probe()
507 master->bus_num = pdata->bus_num; in mpc512x_psc_spi_do_probe()
508 master->num_chipselect = pdata->max_chipselect; in mpc512x_psc_spi_do_probe()
511 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; in mpc512x_psc_spi_do_probe()
512 master->setup = mpc512x_psc_spi_setup; in mpc512x_psc_spi_do_probe()
513 master->prepare_transfer_hardware = mpc512x_psc_spi_prep_xfer_hw; in mpc512x_psc_spi_do_probe()
514 master->transfer_one_message = mpc512x_psc_spi_msg_xfer; in mpc512x_psc_spi_do_probe()
515 master->unprepare_transfer_hardware = mpc512x_psc_spi_unprep_xfer_hw; in mpc512x_psc_spi_do_probe()
516 master->cleanup = mpc512x_psc_spi_cleanup; in mpc512x_psc_spi_do_probe()
517 master->dev.of_node = dev->of_node; in mpc512x_psc_spi_do_probe()
522 ret = -EFAULT; in mpc512x_psc_spi_do_probe()
525 mps->psc = tempp; in mpc512x_psc_spi_do_probe()
526 mps->fifo = in mpc512x_psc_spi_do_probe()
528 ret = devm_request_irq(dev, mps->irq, mpc512x_psc_spi_isr, IRQF_SHARED, in mpc512x_psc_spi_do_probe()
529 "mpc512x-psc-spi", mps); in mpc512x_psc_spi_do_probe()
532 init_completion(&mps->txisrdone); in mpc512x_psc_spi_do_probe()
542 mps->clk_mclk = clk; in mpc512x_psc_spi_do_probe()
543 mps->mclk_rate = clk_get_rate(clk); in mpc512x_psc_spi_do_probe()
553 mps->clk_ipg = clk; in mpc512x_psc_spi_do_probe()
566 clk_disable_unprepare(mps->clk_ipg); in mpc512x_psc_spi_do_probe()
568 clk_disable_unprepare(mps->clk_mclk); in mpc512x_psc_spi_do_probe()
580 clk_disable_unprepare(mps->clk_mclk); in mpc512x_psc_spi_do_remove()
581 clk_disable_unprepare(mps->clk_ipg); in mpc512x_psc_spi_do_remove()
591 regaddr_p = of_get_address(op->dev.of_node, 0, &size64, NULL); in mpc512x_psc_spi_of_probe()
593 dev_err(&op->dev, "Invalid PSC address\n"); in mpc512x_psc_spi_of_probe()
594 return -EINVAL; in mpc512x_psc_spi_of_probe()
596 regaddr64 = of_translate_address(op->dev.of_node, regaddr_p); in mpc512x_psc_spi_of_probe()
598 return mpc512x_psc_spi_do_probe(&op->dev, (u32) regaddr64, (u32) size64, in mpc512x_psc_spi_of_probe()
599 irq_of_parse_and_map(op->dev.of_node, 0)); in mpc512x_psc_spi_of_probe()
604 return mpc512x_psc_spi_do_remove(&op->dev); in mpc512x_psc_spi_of_remove()
608 { .compatible = "fsl,mpc5121-psc-spi", .data = (void *)TYPE_MPC5121 },
609 { .compatible = "fsl,mpc5125-psc-spi", .data = (void *)TYPE_MPC5125 },
619 .name = "mpc512x-psc-spi",
626 MODULE_DESCRIPTION("MPC512x PSC SPI Driver");