Lines Matching full:spi
3 * Marvell Orion SPI controller driver
14 #include <linux/spi/spi.h>
76 * have both is for managing the armada-370-spi case with old
133 static int orion_spi_baudrate_set(struct spi_device *spi, unsigned int speed) in orion_spi_baudrate_set() argument
142 orion_spi = spi_master_get_devdata(spi->master); in orion_spi_baudrate_set()
219 /* Convert the rate to SPI clock divisor value. */ in orion_spi_baudrate_set()
231 orion_spi_mode_set(struct spi_device *spi) in orion_spi_mode_set() argument
236 orion_spi = spi_master_get_devdata(spi->master); in orion_spi_mode_set()
240 if (spi->mode & SPI_CPOL) in orion_spi_mode_set()
242 if (spi->mode & SPI_CPHA) in orion_spi_mode_set()
244 if (spi->mode & SPI_LSB_FIRST) in orion_spi_mode_set()
253 orion_spi_50mhz_ac_timing_erratum(struct spi_device *spi, unsigned int speed) in orion_spi_50mhz_ac_timing_erratum() argument
258 orion_spi = spi_master_get_devdata(spi->master); in orion_spi_50mhz_ac_timing_erratum()
262 * SPI interface supports frequencies of up to 50 MHz. in orion_spi_50mhz_ac_timing_erratum()
264 * 250 MHz and the SPI interfaces is configured for 50MHz SPI in orion_spi_50mhz_ac_timing_erratum()
266 * reads from the SPI device. in orion_spi_50mhz_ac_timing_erratum()
269 * 1. Set CPOL=CPHA=0 in "SPI Interface Configuration in orion_spi_50mhz_ac_timing_erratum()
271 * 2. Set TMISO_SAMPLE value to 0x2 in "SPI Timing Parameters 1 in orion_spi_50mhz_ac_timing_erratum()
278 speed == 50000000 && spi->mode & SPI_CPOL && in orion_spi_50mhz_ac_timing_erratum()
279 spi->mode & SPI_CPHA) in orion_spi_50mhz_ac_timing_erratum()
291 orion_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) in orion_spi_setup_transfer() argument
294 unsigned int speed = spi->max_speed_hz; in orion_spi_setup_transfer()
295 unsigned int bits_per_word = spi->bits_per_word; in orion_spi_setup_transfer()
298 orion_spi = spi_master_get_devdata(spi->master); in orion_spi_setup_transfer()
306 orion_spi_mode_set(spi); in orion_spi_setup_transfer()
309 orion_spi_50mhz_ac_timing_erratum(spi, speed); in orion_spi_setup_transfer()
311 rc = orion_spi_baudrate_set(spi, speed); in orion_spi_setup_transfer()
325 static void orion_spi_set_cs(struct spi_device *spi, bool enable) in orion_spi_set_cs() argument
330 orion_spi = spi_master_get_devdata(spi->master); in orion_spi_set_cs()
332 if (gpio_is_valid(spi->cs_gpio)) in orion_spi_set_cs()
335 cs = spi->chip_select; in orion_spi_set_cs()
363 orion_spi_write_read_8bit(struct spi_device *spi, in orion_spi_write_read_8bit() argument
369 orion_spi = spi_master_get_devdata(spi->master); in orion_spi_write_read_8bit()
383 dev_err(&spi->dev, "TXS timed out\n"); in orion_spi_write_read_8bit()
394 orion_spi_write_read_16bit(struct spi_device *spi, in orion_spi_write_read_16bit() argument
400 orion_spi = spi_master_get_devdata(spi->master); in orion_spi_write_read_16bit()
414 dev_err(&spi->dev, "TXS timed out\n"); in orion_spi_write_read_16bit()
425 orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer) in orion_spi_write_read() argument
430 int cs = spi->chip_select; in orion_spi_write_read()
433 word_len = spi->bits_per_word; in orion_spi_write_read()
436 orion_spi = spi_master_get_devdata(spi->master); in orion_spi_write_read()
439 * Use SPI direct write mode if base address is available. Otherwise in orion_spi_write_read()
449 * Send the TX-data to the SPI device via the direct in orion_spi_write_read()
467 if (orion_spi_write_read_8bit(spi, &tx, &rx) < 0) in orion_spi_write_read()
478 if (orion_spi_write_read_16bit(spi, &tx, &rx) < 0) in orion_spi_write_read()
491 struct spi_device *spi, in orion_spi_transfer_one() argument
496 status = orion_spi_setup_transfer(spi, t); in orion_spi_transfer_one()
501 orion_spi_write_read(spi, t); in orion_spi_transfer_one()
506 static int orion_spi_setup(struct spi_device *spi) in orion_spi_setup() argument
508 if (gpio_is_valid(spi->cs_gpio)) { in orion_spi_setup()
509 gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH)); in orion_spi_setup()
511 return orion_spi_setup_transfer(spi, NULL); in orion_spi_setup()
519 /* Don't deassert CS between the direct mapped SPI transfers */ in orion_spi_reset()
564 .compatible = "marvell,orion-spi",
568 .compatible = "marvell,armada-370-spi",
572 .compatible = "marvell,armada-375-spi",
576 .compatible = "marvell,armada-380-spi",
580 .compatible = "marvell,armada-390-spi",
584 .compatible = "marvell,armada-xp-spi",
597 struct orion_spi *spi; in orion_spi_probe() local
603 master = spi_alloc_master(&pdev->dev, sizeof(*spi)); in orion_spi_probe()
619 /* we support all 4 SPI modes and LSB first option */ in orion_spi_probe()
631 spi = spi_master_get_devdata(master); in orion_spi_probe()
632 spi->master = master; in orion_spi_probe()
633 spi->unused_hw_gpio = -1; in orion_spi_probe()
637 spi->devdata = devdata; in orion_spi_probe()
639 spi->clk = devm_clk_get(&pdev->dev, NULL); in orion_spi_probe()
640 if (IS_ERR(spi->clk)) { in orion_spi_probe()
641 status = PTR_ERR(spi->clk); in orion_spi_probe()
645 status = clk_prepare_enable(spi->clk); in orion_spi_probe()
650 spi->axi_clk = devm_clk_get(&pdev->dev, "axi"); in orion_spi_probe()
651 if (IS_ERR(spi->axi_clk) && in orion_spi_probe()
652 PTR_ERR(spi->axi_clk) == -EPROBE_DEFER) { in orion_spi_probe()
656 if (!IS_ERR(spi->axi_clk)) in orion_spi_probe()
657 clk_prepare_enable(spi->axi_clk); in orion_spi_probe()
659 tclk_hz = clk_get_rate(spi->clk); in orion_spi_probe()
662 * With old device tree, armada-370-spi could be used with in orion_spi_probe()
669 "marvell,armada-370-spi")) in orion_spi_probe()
680 spi->base = devm_ioremap_resource(&pdev->dev, r); in orion_spi_probe()
681 if (IS_ERR(spi->base)) { in orion_spi_probe()
682 status = PTR_ERR(spi->base); in orion_spi_probe()
713 if (spi->unused_hw_gpio == -1) { in orion_spi_probe()
717 spi->unused_hw_gpio = cs; in orion_spi_probe()
727 cs_flags = of_property_read_bool(np, "spi-cs-high") ? in orion_spi_probe()
739 * Check if an address is configured for this SPI device. If in orion_spi_probe()
752 * This needs to get extended for the direct SPI-NOR / SPI-NAND in orion_spi_probe()
755 dir_acc = &spi->child[cs].direct_access; in orion_spi_probe()
771 status = orion_spi_reset(spi); in orion_spi_probe()
788 clk_disable_unprepare(spi->axi_clk); in orion_spi_probe()
790 clk_disable_unprepare(spi->clk); in orion_spi_probe()
800 struct orion_spi *spi = spi_master_get_devdata(master); in orion_spi_remove() local
803 clk_disable_unprepare(spi->axi_clk); in orion_spi_remove()
804 clk_disable_unprepare(spi->clk); in orion_spi_remove()
818 struct orion_spi *spi = spi_master_get_devdata(master); in orion_spi_runtime_suspend() local
820 clk_disable_unprepare(spi->axi_clk); in orion_spi_runtime_suspend()
821 clk_disable_unprepare(spi->clk); in orion_spi_runtime_suspend()
828 struct orion_spi *spi = spi_master_get_devdata(master); in orion_spi_runtime_resume() local
830 if (!IS_ERR(spi->axi_clk)) in orion_spi_runtime_resume()
831 clk_prepare_enable(spi->axi_clk); in orion_spi_runtime_resume()
832 return clk_prepare_enable(spi->clk); in orion_spi_runtime_resume()
854 MODULE_DESCRIPTION("Orion SPI driver");