From patchwork Fri Jul 30 00:37:04 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin Cross X-Patchwork-Id: 115354 Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) by demeter.kernel.org (8.14.4/8.14.3) with ESMTP id o6U0xNud028004 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 30 Jul 2010 00:59:59 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 4.69) (envelope-from ) id 1OedwT-0002v1-Mf; Fri, 30 Jul 2010 00:59:17 +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 4.69) (envelope-from ) id 1OedwT-0002uu-9s for spi-devel-general@lists.sourceforge.net; Fri, 30 Jul 2010 00:59:17 +0000 Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of google.com designates 216.239.44.51 as permitted sender) client-ip=216.239.44.51; envelope-from=ccross@google.com; helo=smtp-out.google.com; Received: from smtp-out.google.com ([216.239.44.51]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.69) id 1OedwQ-0006rJ-WB for spi-devel-general@lists.sourceforge.net; Fri, 30 Jul 2010 00:59:17 +0000 Received: from hpaq2.eem.corp.google.com (hpaq2.eem.corp.google.com [172.25.149.2]) by smtp-out.google.com with ESMTP id o6U0bBmn018743; Thu, 29 Jul 2010 17:37:11 -0700 Received: from walnut.mtv.corp.google.com (walnut.mtv.corp.google.com [172.18.102.62]) by hpaq2.eem.corp.google.com with ESMTP id o6U0b8SH011774; Thu, 29 Jul 2010 17:37:09 -0700 Received: by walnut.mtv.corp.google.com (Postfix, from userid 99897) id 76EADE40EF; Thu, 29 Jul 2010 17:37:08 -0700 (PDT) From: Colin Cross To: linux-tegra@vger.kernel.org Date: Thu, 29 Jul 2010 17:37:04 -0700 Message-Id: <1280450224-25118-1-git-send-email-ccross@google.com> X-Mailer: git-send-email 1.7.1 X-System-Of-Record: true X-Spam-Score: -0.7 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.0 DKIM_VERIFIED Domain Keys Identified Mail: signature passes verification 0.0 DKIM_SIGNED Domain Keys Identified Mail: message has a signature 0.8 AWL AWL: From: address is in the auto white-list X-Headers-End: 1OedwQ-0006rJ-WB Cc: spi-devel-general@lists.sourceforge.net, Erik Gilling , linux-arm-kernel@lists.infradead.org Subject: [spi-devel-general] [PATCH] spi: add spi_tegra driver 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-4.2.3 (demeter.kernel.org [140.211.167.41]); Fri, 30 Jul 2010 00:59:59 +0000 (UTC) diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 91c2f4f..c07e0de 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -298,6 +298,12 @@ config SPI_STMP3XXX help SPI driver for Freescale STMP37xx/378x SoC SSP interface +config SPI_TEGRA + tristate "Nvidia Tegra SPI controller" + depends on ARCH_TEGRA + help + SPI driver for NVidia Tegra SoCs + config SPI_TXX9 tristate "Toshiba TXx9 SPI controller" depends on GENERIC_GPIO && CPU_TX49XX diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index e9cbd18..b6573d8 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_SPI_PPC4xx) += spi_ppc4xx.o obj-$(CONFIG_SPI_S3C24XX_GPIO) += spi_s3c24xx_gpio.o obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx_hw.o obj-$(CONFIG_SPI_S3C64XX) += spi_s3c64xx.o +obj-$(CONFIG_SPI_TEGRA) += spi_tegra.o obj-$(CONFIG_SPI_TXX9) += spi_txx9.o obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o obj-$(CONFIG_SPI_XILINX_OF) += xilinx_spi_of.o diff --git a/drivers/spi/spi_tegra.c b/drivers/spi/spi_tegra.c new file mode 100644 index 0000000..72fc4d4 --- /dev/null +++ b/drivers/spi/spi_tegra.c @@ -0,0 +1,651 @@ +/* + * drivers/spi/spi_tegra.c + * + * Copyright (C) 2010 Google, Inc. + * + * Author: + * Erik Gilling + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#undef DEBUG + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include + +#define DRIVER_NAME "spi_tegra" + +#define BUSY_TIMEOUT 1000 + +#define SLINK_COMMAND 0x000 +#define BIT_LENGTH(x) (((x) & 0x1f) << 0) +#define WORD_SIZE(x) (((x) & 0x1f) << 5) +#define BOTH_EN (1 << 10) +#define CS_SW (1 << 11) +#define CS_VALUE (1 << 12) +#define CS_POLARITY (1 << 13) +#define IDLE_SDA_DRIVE_LOW (0 << 16) +#define IDLE_SDA_DRIVE_HIGH (1 << 16) +#define IDLE_SDA_PULL_LOW (2 << 16) +#define IDLE_SDA_PULL_HIGH (3 << 16) +#define IDLE_SDA_MASK (3 << 16) +#define CS_POLARITY1 (1 << 20) +#define CK_SDA (1 << 21) +#define CS_POLARITY2 (1 << 22) +#define CS_POLARITY3 (1 << 23) +#define IDLE_SCLK_DRIVE_LOW (0 << 24) +#define IDLE_SCLK_DRIVE_HIGH (1 << 24) +#define IDLE_SCLK_PULL_LOW (2 << 24) +#define IDLE_SCLK_PULL_HIGH (3 << 24) +#define IDLE_SCLK_MASK (3 << 24) +#define M_S (1 << 28) +#define WAIT (1 << 29) +#define GO (1 << 30) +#define ENB (1 << 31) + +#define SLINK_COMMAND2 0x004 +#define LSBFE (1 << 0) +#define SSOE (1 << 1) +#define SPIE (1 << 4) +#define BIDIROE (1 << 6) +#define MODFEN (1 << 7) +#define INT_SIZE(x) (((x) & 0x1f) << 8) +#define CS_ACTIVE_BETWEEN (1 << 17) +#define SS_EN_CS(x) (((x) & 0x3) << 18) +#define SS_SETUP(x) (((x) & 0x3) << 20) +#define FIFO_REFILLS_0 (0 << 22) +#define FIFO_REFILLS_1 (1 << 22) +#define FIFO_REFILLS_2 (2 << 22) +#define FIFO_REFILLS_3 (3 << 22) +#define FIFO_REFILLS_MASK (3 << 22) +#define WAIT_PACK_INT(x) (((x) & 0x7) << 26) +#define SPC0 (1 << 29) +#define TXEN (1 << 30) +#define RXEN (1 << 31) + +#define SLINK_STATUS 0x008 +#define COUNT(val) (((val) >> 0) & 0x1f) +#define WORD(val) (((val) >> 5) & 0x1f) +#define BLK_CNT(val) (((val) >> 0) & 0xffff) +#define MODF (1 << 16) +#define RX_UNF (1 << 18) +#define TX_OVF (1 << 19) +#define TX_FULL (1 << 20) +#define TX_EMPTY (1 << 21) +#define RX_FULL (1 << 22) +#define RX_EMPTY (1 << 23) +#define TX_UNF (1 << 24) +#define RX_OVF (1 << 25) +#define TX_FLUSH (1 << 26) +#define RX_FLUSH (1 << 27) +#define SCLK (1 << 28) +#define ERR (1 << 29) +#define RDY (1 << 30) +#define BSY (1 << 31) + +#define SLINK_MAS_DATA 0x010 +#define SLINK_SLAVE_DATA 0x014 + +#define SLINK_DMA_CTL 0x018 +#define DMA_BLOCK_SIZE(x) (((x) & 0xffff) << 0) +#define TX_TRIG_1 (0 << 16) +#define TX_TRIG_4 (1 << 16) +#define TX_TRIG_8 (2 << 16) +#define TX_TRIG_16 (3 << 16) +#define TX_TRIG_MASK (3 << 16) +#define RX_TRIG_1 (0 << 18) +#define RX_TRIG_4 (1 << 18) +#define RX_TRIG_8 (2 << 18) +#define RX_TRIG_16 (3 << 18) +#define RX_TRIG_MASK (3 << 18) +#define PACKED (1 << 20) +#define PACK_SIZE_4 (0 << 21) +#define PACK_SIZE_8 (1 << 21) +#define PACK_SIZE_16 (2 << 21) +#define PACK_SIZE_32 (3 << 21) +#define PACK_SIZE_MASK (3 << 21) +#define IE_TXC (1 << 26) +#define IE_RXC (1 << 27) +#define DMA_EN (1 << 31) + +#define SLINK_STATUS2 0x01c +#define TX_FIFO_EMPTY_COUNT(val) (((val) & 0x3f) >> 0) +#define RX_FIFO_FULL_COUNT(val) (((val) & 0x3f) >> 16) + +#define SLINK_TX_FIFO 0x100 +#define SLINK_RX_FIFO 0x180 + +static const unsigned long spi_tegra_req_sels[] = { + TEGRA_DMA_REQ_SEL_SL2B1, + TEGRA_DMA_REQ_SEL_SL2B2, + TEGRA_DMA_REQ_SEL_SL2B3, + TEGRA_DMA_REQ_SEL_SL2B4, +}; + +static inline unsigned bytes_per_word(u8 bits) +{ + WARN_ON((bits < 1) || bits > 32); + if (bits <= 8) + return 1; + else if (bits <= 16) + return 2; + else if (bits <= 24) + return 3; + else + return 4; +} + +#define BB_LEN 32 + +struct spi_tegra_data { + struct spi_master *master; + struct platform_device *pdev; + spinlock_t lock; + + struct clk *clk; + void __iomem *base; + unsigned long phys; + + u32 cur_speed; + + struct list_head queue; + struct spi_transfer *cur; + unsigned cur_pos; + unsigned cur_len; + unsigned cur_bytes_per_word; + + /* The tegra spi controller has a bug which causes the first word + * in PIO transactions to be garbage. Since packed DMA transactions + * require transfers to be 4 byte aligned we need a bounce buffer + * for the generic case. + */ + struct tegra_dma_req rx_dma_req; + struct tegra_dma_channel *rx_dma; + u32 *rx_bb; + dma_addr_t rx_bb_phys; +}; + + +static unsigned long spi_readl(struct spi_tegra_data *tspi, unsigned long reg) +{ + return readl(tspi->base + reg); +} + +static void spi_writel(struct spi_tegra_data *tspi, unsigned long val, + unsigned long reg) +{ + writel(val, tspi->base + reg); +} + +static void spi_tegra_go(struct spi_tegra_data *tspi) +{ + unsigned long val; + + wmb(); + + val = spi_readl(tspi, SLINK_DMA_CTL); + val &= ~DMA_BLOCK_SIZE(~0) & ~DMA_EN; + val |= DMA_BLOCK_SIZE(tspi->rx_dma_req.size / 4 - 1); + spi_writel(tspi, val, SLINK_DMA_CTL); + + tegra_dma_enqueue_req(tspi->rx_dma, &tspi->rx_dma_req); + + val |= DMA_EN; + spi_writel(tspi, val, SLINK_DMA_CTL); +} + +static unsigned spi_tegra_fill_tx_fifo(struct spi_tegra_data *tspi, + struct spi_transfer *t) +{ + unsigned len = min(t->len - tspi->cur_pos, BB_LEN * + tspi->cur_bytes_per_word); + u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_pos; + int i, j; + unsigned long val; + + val = spi_readl(tspi, SLINK_COMMAND); + val &= ~WORD_SIZE(~0); + val |= WORD_SIZE(len / tspi->cur_bytes_per_word - 1); + spi_writel(tspi, val, SLINK_COMMAND); + + for (i = 0; i < len; i += tspi->cur_bytes_per_word) { + val = 0; + for (j = 0; j < tspi->cur_bytes_per_word; j++) + val |= tx_buf[i + j] << j * 8; + + spi_writel(tspi, val, SLINK_TX_FIFO); + } + + tspi->rx_dma_req.size = len / tspi->cur_bytes_per_word * 4; + + return len; +} + +static unsigned spi_tegra_drain_rx_fifo(struct spi_tegra_data *tspi, + struct spi_transfer *t) +{ + unsigned len = tspi->cur_len; + u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_pos; + int i, j; + unsigned long val; + + for (i = 0; i < len; i += tspi->cur_bytes_per_word) { + val = tspi->rx_bb[i / tspi->cur_bytes_per_word]; + for (j = 0; j < tspi->cur_bytes_per_word; j++) + rx_buf[i + j] = (val >> (j * 8)) & 0xff; + } + + return len; +} + +static int spi_tegra_start_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct spi_tegra_data *tspi = spi_master_get_devdata(spi->master); + u32 speed; + u8 bits_per_word; + unsigned long val; + + speed = t->speed_hz ? t->speed_hz : spi->max_speed_hz; + bits_per_word = t->bits_per_word ? t->bits_per_word : + spi->bits_per_word; + + if (bits_per_word < 1 || bits_per_word > 32) + return -EINVAL; + + if (t->len == 0) + return -EINVAL; + + if (!t->rx_buf && !t->tx_buf) + return -EINVAL; + + tspi->cur_bytes_per_word = bytes_per_word(bits_per_word); + + if (speed != tspi->cur_speed) + clk_set_rate(tspi->clk, speed); + + if (tspi->cur_speed == 0) + clk_enable(tspi->clk); + + tspi->cur_speed = speed; + + val = spi_readl(tspi, SLINK_COMMAND2); + if (t->rx_buf) + val |= RXEN; + else + val &= ~RXEN; + + if (t->tx_buf) + val |= TXEN; + else + val &= ~TXEN; + + val &= ~SS_EN_CS(~0); + val |= SS_EN_CS(spi->chip_select); + val |= SPIE; + + spi_writel(tspi, val, SLINK_COMMAND2); + + val = spi_readl(tspi, SLINK_COMMAND); + val &= ~BIT_LENGTH(~0); + val |= BIT_LENGTH(bits_per_word - 1); + + /* FIXME: should probably control CS manually so that we can be sure + * it does not go low between transfer and to support delay_usecs + * correctly. + */ + val &= ~IDLE_SCLK_MASK & ~CK_SDA & ~CS_SW; + + if (spi->mode & SPI_CPHA) + val |= CK_SDA; + + if (spi->mode & SPI_CPOL) + val |= IDLE_SCLK_DRIVE_HIGH; + else + val |= IDLE_SCLK_DRIVE_LOW; + + val |= M_S; + + spi_writel(tspi, val, SLINK_COMMAND); + + spi_writel(tspi, RX_FLUSH | TX_FLUSH, SLINK_STATUS); + + tspi->cur = t; + tspi->cur_pos = 0; + tspi->cur_len = spi_tegra_fill_tx_fifo(tspi, t); + + spi_tegra_go(tspi); + + return 0; +} + +static void spi_tegra_start_message(struct spi_device *spi, + struct spi_message *m) +{ + struct spi_transfer *t; + + m->actual_length = 0; + + t = list_first_entry(&m->transfers, struct spi_transfer, transfer_list); + spi_tegra_start_transfer(spi, t); +} + +static void tegra_spi_rx_dma_complete(struct tegra_dma_req *req) +{ + struct spi_tegra_data *tspi = req->dev; + unsigned long flags; + struct spi_message *m; + struct spi_device *spi; + int complete = 0; + int timeout = 0; + unsigned long val; + + /* the SPI controller may come back with both the BSY and RDY bits + * set. In this case we need to wait for the BSY bit to clear so + * that we are sure the DMA is finished. + */ + while (timeout++ < BUSY_TIMEOUT) { + if (!(spi_readl(tspi, SLINK_STATUS) & BSY)) + break; + } + + val = spi_readl(tspi, SLINK_STATUS); + val |= RDY; + spi_writel(tspi, val, SLINK_STATUS); + + spin_lock_irqsave(&tspi->lock, flags); + + m = list_first_entry(&tspi->queue, struct spi_message, queue); + spi = m->state; + + tspi->cur_pos += spi_tegra_drain_rx_fifo(tspi, tspi->cur); + m->actual_length += tspi->cur_pos; + + if (tspi->cur_pos < tspi->cur->len) { + tspi->cur_len = spi_tegra_fill_tx_fifo(tspi, tspi->cur); + spi_tegra_go(tspi); + } else if (!list_is_last(&tspi->cur->transfer_list, + &m->transfers)) { + tspi->cur = list_first_entry(&tspi->cur->transfer_list, + struct spi_transfer, + transfer_list); + spi_tegra_start_transfer(spi, tspi->cur); + } else { + complete = 1; + } + + if (complete) { + list_del(&m->queue); + + m->status = 0; + m->complete(m->context); + + if (!list_empty(&tspi->queue)) { + m = list_first_entry(&tspi->queue, struct spi_message, + queue); + spi = m->state; + spi_tegra_start_message(spi, m); + } else { + clk_disable(tspi->clk); + tspi->cur_speed = 0; + } + } + + spin_unlock_irqrestore(&tspi->lock, flags); +} + +static int spi_tegra_setup(struct spi_device *spi) +{ + struct spi_tegra_data *tspi = spi_master_get_devdata(spi->master); + unsigned long cs_bit; + unsigned long val; + unsigned long flags; + + dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n", + spi->bits_per_word, + spi->mode & SPI_CPOL ? "" : "~", + spi->mode & SPI_CPHA ? "" : "~", + spi->max_speed_hz); + + + switch (spi->chip_select) { + case 0: + cs_bit = CS_POLARITY; + break; + + case 1: + cs_bit = CS_POLARITY1; + break; + + case 2: + cs_bit = CS_POLARITY2; + break; + + case 4: + cs_bit = CS_POLARITY3; + break; + + default: + return -EINVAL; + } + + spin_lock_irqsave(&tspi->lock, flags); + + val = spi_readl(tspi, SLINK_COMMAND); + if (spi->mode & SPI_CS_HIGH) + val |= cs_bit; + else + val &= ~cs_bit; + spi_writel(tspi, val, SLINK_COMMAND); + + spin_unlock_irqrestore(&tspi->lock, flags); + + return 0; +} + +static int spi_tegra_transfer(struct spi_device *spi, struct spi_message *m) +{ + struct spi_tegra_data *tspi = spi_master_get_devdata(spi->master); + unsigned long flags; + int was_empty; + + if (list_empty(&m->transfers) || !m->complete) + return -EINVAL; + + m->state = spi; + + spin_lock_irqsave(&tspi->lock, flags); + was_empty = list_empty(&tspi->queue); + list_add_tail(&m->queue, &tspi->queue); + + if (was_empty) + spi_tegra_start_message(spi, m); + + spin_unlock_irqrestore(&tspi->lock, flags); + + return 0; +} + +static void spi_tegra_cleanup(struct spi_device *spi) +{ + dev_dbg(&spi->dev, "cleanup\n"); +} + +static int __init spi_tegra_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct spi_tegra_data *tspi; + struct resource *r; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof *tspi); + if (master == NULL) { + dev_err(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + + if (pdev->id != -1) + master->bus_num = pdev->id; + + master->setup = spi_tegra_setup; + master->transfer = spi_tegra_transfer; + master->cleanup = spi_tegra_cleanup; + master->num_chipselect = 4; + + dev_set_drvdata(&pdev->dev, master); + tspi = spi_master_get_devdata(master); + tspi->master = master; + tspi->pdev = pdev; + spin_lock_init(&tspi->lock); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (r == NULL) { + ret = -ENODEV; + goto err0; + } + + if (!request_mem_region(r->start, (r->end - r->start) + 1, + dev_name(&pdev->dev))) { + ret = -EBUSY; + goto err0; + } + + tspi->phys = r->start; + tspi->base = ioremap(r->start, r->end - r->start + 1); + if (!tspi->base) { + dev_err(&pdev->dev, "can't ioremap iomem\n"); + ret = -ENOMEM; + goto err1; + } + + tspi->clk = clk_get(&pdev->dev, NULL); + if (IS_ERR_OR_NULL(tspi->clk)) { + dev_err(&pdev->dev, "can not get clock\n"); + ret = PTR_ERR(tspi->clk); + goto err2; + } + + INIT_LIST_HEAD(&tspi->queue); + + tspi->rx_dma = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT); + if (IS_ERR(tspi->rx_dma)) { + dev_err(&pdev->dev, "can not allocate rx dma channel\n"); + ret = PTR_ERR(tspi->rx_dma); + goto err3; + } + + tspi->rx_bb = dma_alloc_coherent(&pdev->dev, sizeof(u32) * BB_LEN, + &tspi->rx_bb_phys, GFP_KERNEL); + if (!tspi->rx_bb) { + dev_err(&pdev->dev, "can not allocate rx bounce buffer\n"); + ret = -ENOMEM; + goto err4; + } + + tspi->rx_dma_req.complete = tegra_spi_rx_dma_complete; + tspi->rx_dma_req.to_memory = 1; + tspi->rx_dma_req.dest_addr = tspi->rx_bb_phys; + tspi->rx_dma_req.dest_bus_width = 32; + tspi->rx_dma_req.source_addr = tspi->phys + SLINK_RX_FIFO; + tspi->rx_dma_req.source_bus_width = 32; + tspi->rx_dma_req.source_wrap = 4; + tspi->rx_dma_req.req_sel = spi_tegra_req_sels[pdev->id]; + tspi->rx_dma_req.dev = tspi; + + ret = spi_register_master(master); + + if (ret < 0) + goto err5; + + return ret; + +err5: + dma_free_coherent(&pdev->dev, sizeof(u32) * BB_LEN, + tspi->rx_bb, tspi->rx_bb_phys); +err4: + tegra_dma_free_channel(tspi->rx_dma); +err3: + clk_put(tspi->clk); +err2: + iounmap(tspi->base); +err1: + release_mem_region(r->start, (r->end - r->start) + 1); +err0: + spi_master_put(master); + return ret; +} + +static int __exit spi_tegra_remove(struct platform_device *pdev) +{ + struct spi_master *master; + struct spi_tegra_data *tspi; + struct resource *r; + + master = dev_get_drvdata(&pdev->dev); + tspi = spi_master_get_devdata(master); + + tegra_dma_free_channel(tspi->rx_dma); + + dma_free_coherent(&pdev->dev, sizeof(u32) * BB_LEN, + tspi->rx_bb, tspi->rx_bb_phys); + + clk_put(tspi->clk); + iounmap(tspi->base); + + spi_master_put(master); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(r->start, (r->end - r->start) + 1); + + return 0; +} + + +MODULE_ALIAS("platform:" DRIVER_NAME); + +static struct platform_driver spi_tegra_driver = { + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + }, + .remove = __exit_p(spi_tegra_remove), +}; + + +static int __init spi_tegra_init(void) +{ + return platform_driver_probe(&spi_tegra_driver, spi_tegra_probe); +} +subsys_initcall(spi_tegra_init); + +static void __exit spi_tegra_exit(void) +{ + platform_driver_unregister(&spi_tegra_driver); +} +module_exit(spi_tegra_exit); + +MODULE_LICENSE("GPL");