diff options
Diffstat (limited to 'drivers/spi/spi-ppc4xx.c')
| -rw-r--r-- | drivers/spi/spi-ppc4xx.c | 189 |
1 files changed, 51 insertions, 138 deletions
diff --git a/drivers/spi/spi-ppc4xx.c b/drivers/spi/spi-ppc4xx.c index 0ee53c25ba58..688cabcfbc52 100644 --- a/drivers/spi/spi-ppc4xx.c +++ b/drivers/spi/spi-ppc4xx.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * SPI_PPC4XX SPI controller driver. * @@ -10,10 +11,6 @@ * Copyright (c) 2006 Ben Dooks * Copyright (c) 2006 Simtec Electronics * Ben Dooks <ben@simtec.co.uk> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published - * by the Free Software Foundation. */ /* @@ -23,22 +20,21 @@ * during SPI transfers by setting max_speed_hz via the device tree. */ +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/io.h> #include <linux/module.h> -#include <linux/init.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> #include <linux/sched.h> #include <linux/slab.h> -#include <linux/errno.h> #include <linux/wait.h> -#include <linux/of_platform.h> -#include <linux/of_gpio.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/gpio.h> #include <linux/spi/spi.h> #include <linux/spi/spi_bitbang.h> -#include <asm/io.h> #include <asm/dcr.h> #include <asm/dcr-regs.h> @@ -129,10 +125,8 @@ struct ppc4xx_spi { const unsigned char *tx; unsigned char *rx; - int *gpios; - struct spi_ppc4xx_regs __iomem *regs; /* pointer to the registers */ - struct spi_master *master; + struct spi_controller *host; struct device *dev; }; @@ -149,7 +143,7 @@ static int spi_ppc4xx_txrx(struct spi_device *spi, struct spi_transfer *t) dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf, t->len); - hw = spi_master_get_devdata(spi->master); + hw = spi_controller_get_devdata(spi->controller); hw->tx = t->tx_buf; hw->rx = t->rx_buf; @@ -167,15 +161,13 @@ static int spi_ppc4xx_txrx(struct spi_device *spi, struct spi_transfer *t) static int spi_ppc4xx_setupxfer(struct spi_device *spi, struct spi_transfer *t) { - struct ppc4xx_spi *hw = spi_master_get_devdata(spi->master); + struct ppc4xx_spi *hw = spi_controller_get_devdata(spi->controller); struct spi_ppc4xx_cs *cs = spi->controller_state; int scr; u8 cdm = 0; u32 speed; - u8 bits_per_word; /* Start with the generic configuration for this device. */ - bits_per_word = spi->bits_per_word; speed = spi->max_speed_hz; /* @@ -183,9 +175,6 @@ static int spi_ppc4xx_setupxfer(struct spi_device *spi, struct spi_transfer *t) * the transfer to overwrite the generic configuration with zeros. */ if (t) { - if (t->bits_per_word) - bits_per_word = t->bits_per_word; - if (t->speed_hz) speed = min(t->speed_hz, spi->max_speed_hz); } @@ -209,12 +198,12 @@ static int spi_ppc4xx_setupxfer(struct spi_device *spi, struct spi_transfer *t) if (in_8(&hw->regs->cdm) != cdm) out_8(&hw->regs->cdm, cdm); - spin_lock(&hw->bitbang.lock); + mutex_lock(&hw->bitbang.lock); if (!hw->bitbang.busy) { hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE); /* Need to ndelay here? */ } - spin_unlock(&hw->bitbang.lock); + mutex_unlock(&hw->bitbang.lock); return 0; } @@ -229,7 +218,7 @@ static int spi_ppc4xx_setup(struct spi_device *spi) } if (cs == NULL) { - cs = kzalloc(sizeof *cs, GFP_KERNEL); + cs = kzalloc(sizeof(*cs), GFP_KERNEL); if (!cs) return -ENOMEM; spi->controller_state = cs; @@ -241,7 +230,7 @@ static int spi_ppc4xx_setup(struct spi_device *spi) */ cs->mode = SPI_PPC4XX_MODE_SPE; - switch (spi->mode & (SPI_CPHA | SPI_CPOL)) { + switch (spi->mode & SPI_MODE_X_MASK) { case SPI_MODE_0: cs->mode |= SPI_CLK_MODE0; break; @@ -262,27 +251,6 @@ static int spi_ppc4xx_setup(struct spi_device *spi) return 0; } -static void spi_ppc4xx_chipsel(struct spi_device *spi, int value) -{ - struct ppc4xx_spi *hw = spi_master_get_devdata(spi->master); - unsigned int cs = spi->chip_select; - unsigned int cspol; - - /* - * If there are no chip selects at all, or if this is the special - * case of a non-existent (dummy) chip select, do nothing. - */ - - if (!hw->master->num_chipselect || hw->gpios[cs] == -EEXIST) - return; - - cspol = spi->mode & SPI_CS_HIGH ? 1 : 0; - if (value == BITBANG_CS_INACTIVE) - cspol = !cspol; - - gpio_set_value(hw->gpios[cs], cspol); -} - static irqreturn_t spi_ppc4xx_int(int irq, void *dev_id) { struct ppc4xx_spi *hw; @@ -353,7 +321,7 @@ static void spi_ppc4xx_enable(struct ppc4xx_spi *hw) { /* * On all 4xx PPC's the SPI bus is shared/multiplexed with - * the 2nd I2C bus. We need to enable the the SPI bus before + * the 2nd I2C bus. We need to enable the SPI bus before * using it. */ @@ -361,113 +329,58 @@ static void spi_ppc4xx_enable(struct ppc4xx_spi *hw) dcri_clrset(SDR0, SDR0_PFC1, 0x80000000 >> 14, 0); } -static void free_gpios(struct ppc4xx_spi *hw) -{ - if (hw->master->num_chipselect) { - int i; - for (i = 0; i < hw->master->num_chipselect; i++) - if (gpio_is_valid(hw->gpios[i])) - gpio_free(hw->gpios[i]); - - kfree(hw->gpios); - hw->gpios = NULL; - } -} - /* * platform_device layer stuff... */ static int spi_ppc4xx_of_probe(struct platform_device *op) { struct ppc4xx_spi *hw; - struct spi_master *master; + struct spi_controller *host; struct spi_bitbang *bbp; struct resource resource; struct device_node *np = op->dev.of_node; struct device *dev = &op->dev; struct device_node *opbnp; int ret; - int num_gpios; const unsigned int *clk; - master = spi_alloc_master(dev, sizeof *hw); - if (master == NULL) + host = spi_alloc_host(dev, sizeof(*hw)); + if (host == NULL) return -ENOMEM; - master->dev.of_node = np; - platform_set_drvdata(op, master); - hw = spi_master_get_devdata(master); - hw->master = spi_master_get(master); + host->dev.of_node = np; + platform_set_drvdata(op, host); + hw = spi_controller_get_devdata(host); + hw->host = host; hw->dev = dev; init_completion(&hw->done); - /* - * A count of zero implies a single SPI device without any chip-select. - * Note that of_gpio_count counts all gpios assigned to this spi master. - * This includes both "null" gpio's and real ones. - */ - num_gpios = of_gpio_count(np); - if (num_gpios > 0) { - int i; - - hw->gpios = kzalloc(sizeof(int) * num_gpios, GFP_KERNEL); - if (!hw->gpios) { - ret = -ENOMEM; - goto free_master; - } - - for (i = 0; i < num_gpios; i++) { - int gpio; - enum of_gpio_flags flags; - - gpio = of_get_gpio_flags(np, i, &flags); - hw->gpios[i] = gpio; - - if (gpio_is_valid(gpio)) { - /* Real CS - set the initial state. */ - ret = gpio_request(gpio, np->name); - if (ret < 0) { - dev_err(dev, "can't request gpio " - "#%d: %d\n", i, ret); - goto free_gpios; - } - - gpio_direction_output(gpio, - !!(flags & OF_GPIO_ACTIVE_LOW)); - } else if (gpio == -EEXIST) { - ; /* No CS, but that's OK. */ - } else { - dev_err(dev, "invalid gpio #%d: %d\n", i, gpio); - ret = -EINVAL; - goto free_gpios; - } - } - } - /* Setup the state for the bitbang driver */ bbp = &hw->bitbang; - bbp->master = hw->master; + bbp->ctlr = hw->host; bbp->setup_transfer = spi_ppc4xx_setupxfer; - bbp->chipselect = spi_ppc4xx_chipsel; bbp->txrx_bufs = spi_ppc4xx_txrx; bbp->use_dma = 0; - bbp->master->setup = spi_ppc4xx_setup; - bbp->master->cleanup = spi_ppc4xx_cleanup; - bbp->master->bits_per_word_mask = SPI_BPW_MASK(8); + bbp->ctlr->setup = spi_ppc4xx_setup; + bbp->ctlr->cleanup = spi_ppc4xx_cleanup; + bbp->ctlr->bits_per_word_mask = SPI_BPW_MASK(8); + bbp->ctlr->use_gpio_descriptors = true; + /* + * The SPI core will count the number of GPIO descriptors to figure + * out the number of chip selects available on the platform. + */ + bbp->ctlr->num_chipselect = 0; /* the spi->mode bits understood by this driver: */ - bbp->master->mode_bits = + bbp->ctlr->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST; - /* this many pins in all GPIO controllers */ - bbp->master->num_chipselect = num_gpios > 0 ? num_gpios : 0; - /* Get the clock for the OPB */ opbnp = of_find_compatible_node(NULL, NULL, "ibm,opb"); if (opbnp == NULL) { dev_err(dev, "OPB: cannot find node\n"); ret = -ENODEV; - goto free_gpios; + goto free_host; } /* Get the clock (Hz) for the OPB */ clk = of_get_property(opbnp, "clock-frequency", NULL); @@ -475,7 +388,7 @@ static int spi_ppc4xx_of_probe(struct platform_device *op) dev_err(dev, "OPB: no clock-frequency property set\n"); of_node_put(opbnp); ret = -ENODEV; - goto free_gpios; + goto free_host; } hw->opb_freq = *clk; hw->opb_freq >>= 2; @@ -484,7 +397,7 @@ static int spi_ppc4xx_of_probe(struct platform_device *op) ret = of_address_to_resource(np, 0, &resource); if (ret) { dev_err(dev, "error while parsing device node resource\n"); - goto free_gpios; + goto free_host; } hw->mapbase = resource.start; hw->mapsize = resource_size(&resource); @@ -493,16 +406,20 @@ static int spi_ppc4xx_of_probe(struct platform_device *op) if (hw->mapsize < sizeof(struct spi_ppc4xx_regs)) { dev_err(dev, "too small to map registers\n"); ret = -EINVAL; - goto free_gpios; + goto free_host; } /* Request IRQ */ - hw->irqnum = irq_of_parse_and_map(np, 0); + ret = platform_get_irq(op, 0); + if (ret < 0) + goto free_host; + hw->irqnum = ret; + ret = request_irq(hw->irqnum, spi_ppc4xx_int, 0, "spi_ppc4xx_of", (void *)hw); if (ret) { dev_err(dev, "unable to allocate interrupt\n"); - goto free_gpios; + goto free_host; } if (!request_mem_region(hw->mapbase, hw->mapsize, DRIVER_NAME)) { @@ -525,7 +442,7 @@ static int spi_ppc4xx_of_probe(struct platform_device *op) dev->dma_mask = 0; ret = spi_bitbang_start(bbp); if (ret) { - dev_err(dev, "failed to register SPI master\n"); + dev_err(dev, "failed to register SPI host\n"); goto unmap_regs; } @@ -539,26 +456,23 @@ map_io_error: release_mem_region(hw->mapbase, hw->mapsize); request_mem_error: free_irq(hw->irqnum, hw); -free_gpios: - free_gpios(hw); -free_master: - spi_master_put(master); +free_host: + spi_controller_put(host); dev_err(dev, "initialization failed\n"); return ret; } -static int spi_ppc4xx_of_remove(struct platform_device *op) +static void spi_ppc4xx_of_remove(struct platform_device *op) { - struct spi_master *master = platform_get_drvdata(op); - struct ppc4xx_spi *hw = spi_master_get_devdata(master); + struct spi_controller *host = platform_get_drvdata(op); + struct ppc4xx_spi *hw = spi_controller_get_devdata(host); spi_bitbang_stop(&hw->bitbang); release_mem_region(hw->mapbase, hw->mapsize); free_irq(hw->irqnum, hw); iounmap(hw->regs); - free_gpios(hw); - return 0; + spi_controller_put(host); } static const struct of_device_id spi_ppc4xx_of_match[] = { @@ -573,7 +487,6 @@ static struct platform_driver spi_ppc4xx_of_driver = { .remove = spi_ppc4xx_of_remove, .driver = { .name = DRIVER_NAME, - .owner = THIS_MODULE, .of_match_table = spi_ppc4xx_of_match, }, }; |