From patchwork Sat Feb 5 14:02:03 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Chou X-Patchwork-Id: 533271 Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p15E1dVU029246 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sat, 5 Feb 2011 14:02:00 GMT Received: from localhost ([127.0.0.1] helo=sfs-ml-4.v29.ch3.sourceforge.com) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.74) (envelope-from ) id 1Plihh-00024Q-ME; Sat, 05 Feb 2011 14:01:33 +0000 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.74) (envelope-from ) id 1Plihg-00024K-RA for spi-devel-general@lists.sourceforge.net; Sat, 05 Feb 2011 14:01:32 +0000 X-ACL-Warn: Received: from www.wytron.com.tw ([211.75.82.101]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.74) id 1Plihd-0003k3-R3; Sat, 05 Feb 2011 14:01:32 +0000 Received: from c5 ([192.168.1.250] helo=darkstar.wytron.com.tw) by www.wytron.com.tw with esmtp (Exim 4.69) (envelope-from ) id 1PlihT-0006J5-8L; Sat, 05 Feb 2011 22:01:20 +0800 From: Thomas Chou To: David Brownell , Grant Likely Subject: [PATCH v7] spi: New driver for Altera SPI Date: Sat, 5 Feb 2011 22:02:03 +0800 Message-Id: <1296914523-13740-1-git-send-email-thomas@wytron.com.tw> X-Mailer: git-send-email 1.7.3.5 In-Reply-To: <20110203173430.GC6180@angua.secretlab.ca> References: <20110203173430.GC6180@angua.secretlab.ca> X-SA-Exim-Connect-IP: 192.168.1.250 X-SA-Exim-Mail-From: thomas@wytron.com.tw X-SA-Exim-Scanned: No (on www.wytron.com.tw); SAEximRunCond expanded to false X-Spam-Score: -0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Headers-End: 1Plihd-0003k3-R3 Cc: devicetree-discuss@lists.ozlabs.org, spi-devel-general@lists.sourceforge.net, nios2-dev@sopc.et.ntust.edu.tw, linux-kernel@vger.kernel.org, Thomas Chou X-BeenThere: spi-devel-general@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: Linux SPI core/device drivers discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: spi-devel-general-bounces@lists.sourceforge.net X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Sat, 05 Feb 2011 14:02:00 +0000 (UTC) diff --git a/Documentation/devicetree/bindings/spi/spi_altera.txt b/Documentation/devicetree/bindings/spi/spi_altera.txt new file mode 100644 index 0000000..dda3759 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/spi_altera.txt @@ -0,0 +1,4 @@ +Altera SPI + +Required properties: +- compatible : should be "ALTR,spi-1.0". diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index bb233a9..4d5d33c 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -53,6 +53,13 @@ if SPI_MASTER comment "SPI Master Controller Drivers" +config SPI_ALTERA + tristate "Altera SPI Controller" + default n + select SPI_BITBANG + help + This is the driver for the Altera SPI Controller. + config SPI_ATH79 tristate "Atheros AR71XX/AR724X/AR913X SPI controller driver" depends on ATH79 && GENERIC_GPIO diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 86d1b5f..4d2e35a 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -9,6 +9,7 @@ ccflags-$(CONFIG_SPI_DEBUG) := -DDEBUG obj-$(CONFIG_SPI_MASTER) += spi.o # SPI master controller drivers (bus) +obj-$(CONFIG_SPI_ALTERA) += spi_altera.o obj-$(CONFIG_SPI_ATMEL) += atmel_spi.o obj-$(CONFIG_SPI_ATH79) += ath79_spi.o obj-$(CONFIG_SPI_BFIN) += spi_bfin5xx.o diff --git a/drivers/spi/spi_altera.c b/drivers/spi/spi_altera.c new file mode 100644 index 0000000..e7f4835 --- /dev/null +++ b/drivers/spi/spi_altera.c @@ -0,0 +1,335 @@ +/* + * Altera SPI driver + * + * Copyright (C) 2008 Thomas Chou + * + * Based on spi_s3c24xx.c, which is: + * Copyright (c) 2006 Ben Dooks + * Copyright (c) 2006 Simtec Electronics + * Ben Dooks + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRV_NAME "spi_altera" + +#define ALTERA_SPI_RXDATA 0 +#define ALTERA_SPI_TXDATA 4 +#define ALTERA_SPI_STATUS 8 +#define ALTERA_SPI_CONTROL 12 +#define ALTERA_SPI_SLAVE_SEL 20 + +#define ALTERA_SPI_STATUS_ROE_MSK 0x8 +#define ALTERA_SPI_STATUS_TOE_MSK 0x10 +#define ALTERA_SPI_STATUS_TMT_MSK 0x20 +#define ALTERA_SPI_STATUS_TRDY_MSK 0x40 +#define ALTERA_SPI_STATUS_RRDY_MSK 0x80 +#define ALTERA_SPI_STATUS_E_MSK 0x100 + +#define ALTERA_SPI_CONTROL_IROE_MSK 0x8 +#define ALTERA_SPI_CONTROL_ITOE_MSK 0x10 +#define ALTERA_SPI_CONTROL_ITRDY_MSK 0x40 +#define ALTERA_SPI_CONTROL_IRRDY_MSK 0x80 +#define ALTERA_SPI_CONTROL_IE_MSK 0x100 +#define ALTERA_SPI_CONTROL_SSO_MSK 0x400 + +struct altera_spi { + /* bitbang has to be first */ + struct spi_bitbang bitbang; + struct completion done; + + void __iomem *base; + int irq; + int len; + int count; + int bytes_per_word; + unsigned long imr; + + /* data buffers */ + const unsigned char *tx; + unsigned char *rx; +}; + +static inline struct altera_spi *altera_spi_to_hw(struct spi_device *sdev) +{ + return spi_master_get_devdata(sdev->master); +} + +static void altera_spi_chipsel(struct spi_device *spi, int value) +{ + struct altera_spi *hw = altera_spi_to_hw(spi); + + if (spi->mode & SPI_CS_HIGH) { + switch (value) { + case BITBANG_CS_INACTIVE: + writel(1 << spi->chip_select, + hw->base + ALTERA_SPI_SLAVE_SEL); + hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK; + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + break; + + case BITBANG_CS_ACTIVE: + hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK; + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + writel(0, hw->base + ALTERA_SPI_SLAVE_SEL); + break; + } + } else { + switch (value) { + case BITBANG_CS_INACTIVE: + hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK; + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + break; + + case BITBANG_CS_ACTIVE: + writel(1 << spi->chip_select, + hw->base + ALTERA_SPI_SLAVE_SEL); + hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK; + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + break; + } + } +} + +static int altera_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t) +{ + return 0; +} + +static int altera_spi_setup(struct spi_device *spi) +{ + return 0; +} + +static inline unsigned int hw_txbyte(struct altera_spi *hw, int count) +{ + if (hw->tx) { + switch (hw->bytes_per_word) { + case 1: + return hw->tx[count]; + case 2: + return (hw->tx[count * 2] + | (hw->tx[count * 2 + 1] << 8)); + } + } + return 0; +} + +static int altera_spi_txrx(struct spi_device *spi, struct spi_transfer *t) +{ + struct altera_spi *hw = altera_spi_to_hw(spi); + + hw->tx = t->tx_buf; + hw->rx = t->rx_buf; + hw->count = 0; + hw->bytes_per_word = (t->bits_per_word ? : spi->bits_per_word) / 8; + hw->len = t->len / hw->bytes_per_word; + + if (hw->irq >= 0) { + /* enable receive interrupt */ + hw->imr |= ALTERA_SPI_CONTROL_IRRDY_MSK; + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + + /* send the first byte */ + writel(hw_txbyte(hw, 0), hw->base + ALTERA_SPI_TXDATA); + + wait_for_completion(&hw->done); + /* disable receive interrupt */ + hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK; + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + } else { + /* send the first byte */ + writel(hw_txbyte(hw, 0), hw->base + ALTERA_SPI_TXDATA); + + while (1) { + unsigned int rxd; + + while (!(readl(hw->base + ALTERA_SPI_STATUS) & + ALTERA_SPI_STATUS_RRDY_MSK)) + cpu_relax(); + + rxd = readl(hw->base + ALTERA_SPI_RXDATA); + if (hw->rx) { + switch (hw->bytes_per_word) { + case 1: + hw->rx[hw->count] = rxd; + break; + case 2: + hw->rx[hw->count * 2] = rxd; + hw->rx[hw->count * 2 + 1] = rxd >> 8; + break; + } + } + + hw->count++; + + if (hw->count < hw->len) + writel(hw_txbyte(hw, hw->count), + hw->base + ALTERA_SPI_TXDATA); + else + break; + } + + } + + return hw->count * hw->bytes_per_word; +} + +static irqreturn_t altera_spi_irq(int irq, void *dev) +{ + struct altera_spi *hw = dev; + unsigned int rxd; + + rxd = readl(hw->base + ALTERA_SPI_RXDATA); + if (hw->rx) { + switch (hw->bytes_per_word) { + case 1: + hw->rx[hw->count] = rxd; + break; + case 2: + hw->rx[hw->count * 2] = rxd; + hw->rx[hw->count * 2 + 1] = rxd >> 8; + break; + } + } + + hw->count++; + + if (hw->count < hw->len) + writel(hw_txbyte(hw, hw->count), hw->base + ALTERA_SPI_TXDATA); + else + complete(&hw->done); + + return IRQ_HANDLED; +} + +static int __devinit altera_spi_probe(struct platform_device *pdev) +{ + struct altera_spi_platform_data *platp = pdev->dev.platform_data; + struct altera_spi *hw; + struct spi_master *master; + struct resource *res; + int err = -ENODEV; + + master = spi_alloc_master(&pdev->dev, sizeof(struct altera_spi)); + if (!master) + return err; + + /* setup the master state. */ + master->bus_num = pdev->id; + master->num_chipselect = 16; + master->mode_bits = SPI_CS_HIGH; + master->setup = altera_spi_setup; + + hw = spi_master_get_devdata(master); + platform_set_drvdata(pdev, hw); + + /* setup the state for the bitbang driver */ + hw->bitbang.master = spi_master_get(master); + if (!hw->bitbang.master) + return err; + hw->bitbang.setup_transfer = altera_spi_setupxfer; + hw->bitbang.chipselect = altera_spi_chipsel; + hw->bitbang.txrx_bufs = altera_spi_txrx; + + /* find and map our resources */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + goto exit_busy; + if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res), + pdev->name)) + goto exit_busy; + hw->base = devm_ioremap_nocache(&pdev->dev, res->start, + resource_size(res)); + if (!hw->base) + goto exit_busy; + /* program defaults into the registers */ + hw->imr = 0; /* disable spi interrupts */ + writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + writel(0, hw->base + ALTERA_SPI_STATUS); /* clear status reg */ + if (readl(hw->base + ALTERA_SPI_STATUS) & ALTERA_SPI_STATUS_RRDY_MSK) + readl(hw->base + ALTERA_SPI_RXDATA); /* flush rxdata */ + /* irq is optional */ + hw->irq = platform_get_irq(pdev, 0); + if (hw->irq >= 0) { + init_completion(&hw->done); + err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0, + pdev->name, hw); + if (err) + goto exit; + } + /* find platform data */ + if (!platp) + hw->bitbang.master->dev.of_node = pdev->dev.of_node; + + /* register our spi controller */ + err = spi_bitbang_start(&hw->bitbang); + if (err) + goto exit; + dev_info(&pdev->dev, "base %p, irq %d\n", hw->base, hw->irq); + + return 0; + +exit_busy: + err = -EBUSY; +exit: + platform_set_drvdata(pdev, NULL); + spi_master_put(master); + return err; +} + +static int __devexit altera_spi_remove(struct platform_device *dev) +{ + struct altera_spi *hw = platform_get_drvdata(dev); + struct spi_master *master = hw->bitbang.master; + + spi_bitbang_stop(&hw->bitbang); + platform_set_drvdata(dev, NULL); + spi_master_put(master); + return 0; +} + +static const struct of_device_id altera_spi_match[] = { + { .compatible = "ALTR,spi-1.0", }, + {}, +} +MODULE_DEVICE_TABLE(of, altera_spi_match); + +static struct platform_driver altera_spi_driver = { + .probe = altera_spi_probe, + .remove = __devexit_p(altera_spi_remove), + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + .pm = NULL, + .of_match_table = altera_spi_match, + }, +}; + +static int __init altera_spi_init(void) +{ + return platform_driver_register(&altera_spi_driver); +} +module_init(altera_spi_init); + +static void __exit altera_spi_exit(void) +{ + platform_driver_unregister(&altera_spi_driver); +} +module_exit(altera_spi_exit); + +MODULE_DESCRIPTION("Altera SPI driver"); +MODULE_AUTHOR("Thomas Chou "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRV_NAME);