Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756006Ab2FNNHp (ORCPT ); Thu, 14 Jun 2012 09:07:45 -0400 Received: from mail-yw0-f46.google.com ([209.85.213.46]:55813 "EHLO mail-yw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755534Ab2FNNHn (ORCPT ); Thu, 14 Jun 2012 09:07:43 -0400 From: Alexandre Pereira da Silva To: Grant Likely , Rob Herring , Rob Landley , devicetree-discuss@lists.ozlabs.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, spi-devel-general@lists.sourceforge.net, Roland Stigge Cc: Alexandre Pereira da Silva Subject: [PATCH] spi/pl022: add devicetree support Date: Thu, 14 Jun 2012 10:07:11 -0300 Message-Id: <1339679231-14576-1-git-send-email-aletes.xgr@gmail.com> X-Mailer: git-send-email 1.7.10 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11505 Lines: 326 Add the chipselect array and cur_cs properties to pl022 main structure Add a wrapper function to decide if the cs should be controlled by the cs_control callback or the chipselect gpio Populate chipselect property from cs-gpios Populate master->dev.of_node, so the spi bus can find child spi devices and register them At pl022 setup, fill chip_data structure from dt nodes, if not provided by platform. Signed-off-by: Alexandre Pereira da Silva Tested-by: Roland Stigge --- .../devicetree/bindings/spi/spi_pl022.txt | 15 +++ drivers/spi/spi-pl022.c | 117 ++++++++++++++++---- 2 files changed, 112 insertions(+), 20 deletions(-) diff --git a/Documentation/devicetree/bindings/spi/spi_pl022.txt b/Documentation/devicetree/bindings/spi/spi_pl022.txt index 306ec3f..b089ec7 100644 --- a/Documentation/devicetree/bindings/spi/spi_pl022.txt +++ b/Documentation/devicetree/bindings/spi/spi_pl022.txt @@ -6,7 +6,22 @@ Required properties: - interrupts : Should contain SPI controller interrupt Optional properties: +- pl022,num-chipselects : total number of chipselects - cs-gpios : should specify GPIOs used for chipselects. The gpios will be referred to as reg = in the SPI child nodes. If unspecified, a single SPI device without a chip select can be used. +SPI slave nodes must be children of the SPI master node and can +contain the following properties. +See include/linux/amba/pl022.h for more details + +- pl022,hierarchy : master or slave interface +- pl022,interface : interface type +- pl022,slave-tx-disable : disconnect tx line in slave mode +- pl022,com-mode : polling, interrupt or dma +- pl022,rx-level-trig : Rx FIFO watermark level +- pl022,tx-level-trig : Tx FIFO watermark level +- pl022,ctrl-len : Microwire interface: Control length +- pl022,wait-state : Microwire interface: Wait state +- pl022,duplex : Microwire interface: Full/Half duplex + diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c index 400ae21..50d1644 100644 --- a/drivers/spi/spi-pl022.c +++ b/drivers/spi/spi-pl022.c @@ -40,6 +40,8 @@ #include #include #include +#include +#include /* * This macro is used to define some register default values. @@ -389,6 +391,8 @@ struct pl022 { char *dummypage; bool dma_running; #endif + int cur_cs; + int chipselect[0]; }; /** @@ -433,6 +437,14 @@ static void null_cs_control(u32 command) pr_debug("pl022: dummy chip select control, CS=0x%x\n", command); } +static void pl022_cs_control(struct pl022 *pl022, u32 command) +{ + if (gpio_is_valid(pl022->cur_cs)) + gpio_set_value(pl022->cur_cs, command); + else + pl022->cur_chip->cs_control(command); +} + /** * giveback - current spi_message is over, schedule next message and call * callback of this message. Assumes that caller already @@ -479,7 +491,7 @@ static void giveback(struct pl022 *pl022) if (next_msg && next_msg->spi != pl022->cur_msg->spi) next_msg = NULL; if (!next_msg || pl022->cur_msg->state == STATE_ERROR) - pl022->cur_chip->cs_control(SSP_CHIP_DESELECT); + pl022_cs_control(pl022, SSP_CHIP_DESELECT); else pl022->next_msg_cs_active = true; @@ -813,8 +825,7 @@ static void dma_callback(void *data) /* Update total bytes transferred */ msg->actual_length += pl022->cur_transfer->len; if (pl022->cur_transfer->cs_change) - pl022->cur_chip-> - cs_control(SSP_CHIP_DESELECT); + pl022_cs_control(pl022, SSP_CHIP_DESELECT); /* Move to next transfer */ msg->state = next_transfer(pl022); @@ -1247,8 +1258,7 @@ static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id) /* Update total bytes transferred */ msg->actual_length += pl022->cur_transfer->len; if (pl022->cur_transfer->cs_change) - pl022->cur_chip-> - cs_control(SSP_CHIP_DESELECT); + pl022_cs_control(pl022, SSP_CHIP_DESELECT); /* Move to next transfer */ msg->state = next_transfer(pl022); tasklet_schedule(&pl022->pump_transfers); @@ -1333,7 +1343,7 @@ static void pump_transfers(unsigned long data) /* Reselect chip select only if cs_change was requested */ if (previous->cs_change) - pl022->cur_chip->cs_control(SSP_CHIP_SELECT); + pl022_cs_control(pl022, SSP_CHIP_SELECT); } else { /* STATE_START */ message->state = STATE_RUNNING; @@ -1372,7 +1382,7 @@ static void do_interrupt_dma_transfer(struct pl022 *pl022) /* Enable target chip, if not already active */ if (!pl022->next_msg_cs_active) - pl022->cur_chip->cs_control(SSP_CHIP_SELECT); + pl022_cs_control(pl022, SSP_CHIP_SELECT); if (set_up_next_transfer(pl022, pl022->cur_transfer)) { /* Error path */ @@ -1424,12 +1434,12 @@ static void do_polling_transfer(struct pl022 *pl022) if (previous->delay_usecs) udelay(previous->delay_usecs); if (previous->cs_change) - pl022->cur_chip->cs_control(SSP_CHIP_SELECT); + pl022_cs_control(pl022, SSP_CHIP_SELECT); } else { /* STATE_START */ message->state = STATE_RUNNING; if (!pl022->next_msg_cs_active) - pl022->cur_chip->cs_control(SSP_CHIP_SELECT); + pl022_cs_control(pl022, SSP_CHIP_SELECT); } /* Configuration Changing Per Transfer */ @@ -1461,7 +1471,7 @@ static void do_polling_transfer(struct pl022 *pl022) /* Update total byte transferred */ message->actual_length += pl022->cur_transfer->len; if (pl022->cur_transfer->cs_change) - pl022->cur_chip->cs_control(SSP_CHIP_DESELECT); + pl022_cs_control(pl022, SSP_CHIP_DESELECT); /* Move to next transfer */ message->state = next_transfer(pl022); } @@ -1490,6 +1500,7 @@ static int pl022_transfer_one_message(struct spi_master *master, /* Setup the SPI using the per chip configuration */ pl022->cur_chip = spi_get_ctldata(msg->spi); + pl022->cur_cs = pl022->chipselect[msg->spi->chip_select]; restore_state(pl022); flush(pl022); @@ -1733,7 +1744,7 @@ static int calculate_effective_freq(struct pl022 *pl022, int freq, struct * A piece of default chip info unless the platform * supplies it. */ -static const struct pl022_config_chip pl022_default_chip_info = { +static struct pl022_config_chip pl022_default_chip_info = { .com_mode = POLLING_TRANSFER, .iface = SSP_INTERFACE_MOTOROLA_SPI, .hierarchy = SSP_SLAVE, @@ -1761,12 +1772,14 @@ static const struct pl022_config_chip pl022_default_chip_info = { static int pl022_setup(struct spi_device *spi) { struct pl022_config_chip const *chip_info; + struct pl022_config_chip chip_info_dt; struct chip_data *chip; struct ssp_clock_params clk_freq = { .cpsdvsr = 0, .scr = 0}; int status = 0; struct pl022 *pl022 = spi_master_get_devdata(spi->master); unsigned int bits = spi->bits_per_word; u32 tmp; + struct device_node *np = spi->dev.of_node; if (!spi->max_speed_hz) return -EINVAL; @@ -1789,10 +1802,36 @@ static int pl022_setup(struct spi_device *spi) chip_info = spi->controller_data; if (chip_info == NULL) { - chip_info = &pl022_default_chip_info; - /* spi_board_info.controller_data not is supplied */ - dev_dbg(&spi->dev, - "using default controller_data settings\n"); + if (np) { + chip_info_dt = pl022_default_chip_info; + + of_property_read_u32(np, "pl022,hierarchy", + &chip_info_dt.hierarchy); + of_property_read_u32(np, "pl022,interface", + &chip_info_dt.iface); + chip_info_dt.slave_tx_disable = + of_property_read_bool(np, + "pl022,slave-tx-disable"); + of_property_read_u32(np, "pl022,com-mode", + &chip_info_dt.com_mode); + of_property_read_u32(np, "pl022,rx-level-trig", + &chip_info_dt.rx_lev_trig); + of_property_read_u32(np, "pl022,tx-level-trig", + &chip_info_dt.tx_lev_trig); + of_property_read_u32(np, "pl022,ctrl-len", + &chip_info_dt.ctrl_len); + of_property_read_u32(np, "pl022,wait-state", + &chip_info_dt.wait_state); + of_property_read_u32(np, "pl022,duplex", + &chip_info_dt.duplex); + + chip_info = &chip_info_dt; + } else { + chip_info = &pl022_default_chip_info; + /* spi_board_info.controller_data not is supplied */ + dev_dbg(&spi->dev, + "using default controller_data settings\n"); + } } else dev_dbg(&spi->dev, "using user supplied controller_data settings\n"); @@ -1835,8 +1874,9 @@ static int pl022_setup(struct spi_device *spi) chip->xfer_type = chip_info->com_mode; if (!chip_info->cs_control) { chip->cs_control = null_cs_control; - dev_warn(&spi->dev, - "chip select function is NULL for this chip\n"); + if (!gpio_is_valid(pl022->chipselect[spi->chip_select])) + dev_warn(&spi->dev, + "chip select function is NULL for this chip\n"); } else chip->cs_control = chip_info->cs_control; @@ -1988,7 +2028,8 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) struct pl022_ssp_controller *platform_info = adev->dev.platform_data; struct spi_master *master; struct pl022 *pl022 = NULL; /*Data for this driver */ - int status = 0; + struct device_node *np = adev->dev.of_node; + int status = 0, i, num_cs; dev_info(&adev->dev, "ARM PL022 driver, device ID: 0x%08x\n", adev->periphid); @@ -1998,8 +2039,14 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) goto err_no_pdata; } + num_cs = platform_info->num_chipselect; +#ifdef CONFIG_OF + of_property_read_u32(np, "pl022,num-chipselects", &num_cs); +#endif + /* Allocate master with space for data */ - master = spi_alloc_master(dev, sizeof(struct pl022)); + master = spi_alloc_master(dev, + sizeof(struct pl022) + sizeof(int) * num_cs); if (master == NULL) { dev_err(&adev->dev, "probe - cannot alloc SPI master\n"); status = -ENOMEM; @@ -2017,13 +2064,40 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) * on this board */ master->bus_num = platform_info->bus_id; - master->num_chipselect = platform_info->num_chipselect; + master->num_chipselect = num_cs; master->cleanup = pl022_cleanup; master->setup = pl022_setup; master->prepare_transfer_hardware = pl022_prepare_transfer_hardware; master->transfer_one_message = pl022_transfer_one_message; master->unprepare_transfer_hardware = pl022_unprepare_transfer_hardware; master->rt = platform_info->rt; + master->dev.of_node = dev->of_node; + +#ifdef CONFIG_OF + for (i = 0; i < num_cs; i++) { + int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); + + if (cs_gpio == -ENODEV) { + status = -EPROBE_DEFER; + goto err_no_gpio; + } + + pl022->chipselect[i] = cs_gpio; + + if (gpio_is_valid(cs_gpio)) { + if (gpio_request(cs_gpio, "ssp-pl022")) + dev_err(&adev->dev, + "could not request %d gpio\n", cs_gpio); + else if (gpio_direction_output(cs_gpio, 1)) + dev_err(&adev->dev, + "could set gpio %d as output\n", + cs_gpio); + } + } +#else + for (i = 0; i < num_cs; i++) + pl022->chipselect[i] = -EINVAL; +#endif /* * Supports mode 0-3, loopback, and active low CS. Transfers are @@ -2130,6 +2204,9 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) err_no_ioremap: amba_release_regions(adev); err_no_ioregion: + #ifdef CONFIG_OF + err_no_gpio: + #endif spi_master_put(master); err_no_master: err_no_pdata: -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/