--- /dev/null
+/*
+ * bf6xx_sport.c Analog Devices BF6XX SPORT driver
+ *
+ * Copyright (c) 2012 Analog Devices Inc.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <asm/blackfin.h>
+#include <asm/dma.h>
+#include <asm/portmux.h>
+
+#include "bf6xx-sport.h"
+
+int sport_set_tx_params(struct sport_device *sport,
+ struct sport_params *params)
+{
+ if (sport->tx_regs->spctl & SPORT_CTL_SPENPRI)
+ return -EBUSY;
+ sport->tx_regs->spctl = params->spctl | SPORT_CTL_SPTRAN;
+ sport->tx_regs->div = params->div;
+ SSYNC();
+ return 0;
+}
+EXPORT_SYMBOL(sport_set_tx_params);
+
+int sport_set_rx_params(struct sport_device *sport,
+ struct sport_params *params)
+{
+ if (sport->rx_regs->spctl & SPORT_CTL_SPENPRI)
+ return -EBUSY;
+ sport->rx_regs->spctl = params->spctl & ~SPORT_CTL_SPTRAN;
+ sport->rx_regs->div = params->div;
+ SSYNC();
+ return 0;
+}
+EXPORT_SYMBOL(sport_set_rx_params);
+
+static int compute_wdsize(size_t wdsize)
+{
+ switch (wdsize) {
+ case 1:
+ return WDSIZE_8 | PSIZE_8;
+ case 2:
+ return WDSIZE_16 | PSIZE_16;
+ default:
+ return WDSIZE_32 | PSIZE_32;
+ }
+}
+
+void sport_tx_start(struct sport_device *sport)
+{
+ set_dma_next_desc_addr(sport->tx_dma_chan, sport->tx_desc);
+ set_dma_config(sport->tx_dma_chan, DMAFLOW_LIST | DI_EN
+ | compute_wdsize(sport->wdsize) | NDSIZE_6);
+ enable_dma(sport->tx_dma_chan);
+ sport->tx_regs->spctl |= SPORT_CTL_SPENPRI;
+ SSYNC();
+}
+EXPORT_SYMBOL(sport_tx_start);
+
+void sport_rx_start(struct sport_device *sport)
+{
+ set_dma_next_desc_addr(sport->rx_dma_chan, sport->rx_desc);
+ set_dma_config(sport->rx_dma_chan, DMAFLOW_LIST | DI_EN | WNR
+ | compute_wdsize(sport->wdsize) | NDSIZE_6);
+ enable_dma(sport->rx_dma_chan);
+ sport->rx_regs->spctl |= SPORT_CTL_SPENPRI;
+ SSYNC();
+}
+EXPORT_SYMBOL(sport_rx_start);
+
+void sport_tx_stop(struct sport_device *sport)
+{
+ sport->tx_regs->spctl &= ~SPORT_CTL_SPENPRI;
+ SSYNC();
+ disable_dma(sport->tx_dma_chan);
+}
+EXPORT_SYMBOL(sport_tx_stop);
+
+void sport_rx_stop(struct sport_device *sport)
+{
+ sport->rx_regs->spctl &= ~SPORT_CTL_SPENPRI;
+ SSYNC();
+ disable_dma(sport->rx_dma_chan);
+}
+EXPORT_SYMBOL(sport_rx_stop);
+
+void sport_set_tx_callback(struct sport_device *sport,
+ void (*tx_callback)(void *), void *tx_data)
+{
+ sport->tx_callback = tx_callback;
+ sport->tx_data = tx_data;
+}
+EXPORT_SYMBOL(sport_set_tx_callback);
+
+void sport_set_rx_callback(struct sport_device *sport,
+ void (*rx_callback)(void *), void *rx_data)
+{
+ sport->rx_callback = rx_callback;
+ sport->rx_data = rx_data;
+}
+EXPORT_SYMBOL(sport_set_rx_callback);
+
+static void setup_desc(struct dmasg *desc, void *buf, int fragcount,
+ size_t fragsize, unsigned int cfg,
+ unsigned int count, size_t wdsize)
+{
+
+ int i;
+
+ for (i = 0; i < fragcount; ++i) {
+ desc[i].next_desc_addr = &(desc[i + 1]);
+ desc[i].start_addr = (unsigned long)buf + i*fragsize;
+ desc[i].cfg = cfg;
+ desc[i].x_count = count;
+ desc[i].x_modify = wdsize;
+ desc[i].y_count = 0;
+ desc[i].y_modify = 0;
+ }
+
+ /* make circular */
+ desc[fragcount-1].next_desc_addr = desc;
+}
+
+int sport_config_tx_dma(struct sport_device *sport, void *buf,
+ int fragcount, size_t fragsize)
+{
+ unsigned int count;
+ unsigned int cfg;
+ dma_addr_t addr;
+
+ count = fragsize/sport->wdsize;
+
+ if (sport->tx_desc)
+ dma_free_coherent(NULL, sport->tx_desc_size,
+ sport->tx_desc, 0);
+
+ sport->tx_desc = dma_alloc_coherent(NULL,
+ fragcount * sizeof(struct dmasg), &addr, 0);
+ sport->tx_desc_size = fragcount * sizeof(struct dmasg);
+ if (!sport->tx_desc)
+ return -ENOMEM;
+
+ sport->tx_buf = buf;
+ sport->tx_fragsize = fragsize;
+ sport->tx_frags = fragcount;
+ cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize) | NDSIZE_6;
+
+ setup_desc(sport->tx_desc, buf, fragcount, fragsize,
+ cfg|DMAEN, count, sport->wdsize);
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_config_tx_dma);
+
+int sport_config_rx_dma(struct sport_device *sport, void *buf,
+ int fragcount, size_t fragsize)
+{
+ unsigned int count;
+ unsigned int cfg;
+ dma_addr_t addr;
+
+ count = fragsize/sport->wdsize;
+
+ if (sport->rx_desc)
+ dma_free_coherent(NULL, sport->rx_desc_size,
+ sport->rx_desc, 0);
+
+ sport->rx_desc = dma_alloc_coherent(NULL,
+ fragcount * sizeof(struct dmasg), &addr, 0);
+ sport->rx_desc_size = fragcount * sizeof(struct dmasg);
+ if (!sport->rx_desc)
+ return -ENOMEM;
+
+ sport->rx_buf = buf;
+ sport->rx_fragsize = fragsize;
+ sport->rx_frags = fragcount;
+ cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize)
+ | WNR | NDSIZE_6;
+
+ setup_desc(sport->rx_desc, buf, fragcount, fragsize,
+ cfg|DMAEN, count, sport->wdsize);
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_config_rx_dma);
+
+unsigned long sport_curr_offset_tx(struct sport_device *sport)
+{
+ unsigned long curr = get_dma_curr_addr(sport->tx_dma_chan);
+
+ return (unsigned char *)curr - sport->tx_buf;
+}
+EXPORT_SYMBOL(sport_curr_offset_tx);
+
+unsigned long sport_curr_offset_rx(struct sport_device *sport)
+{
+ unsigned long curr = get_dma_curr_addr(sport->rx_dma_chan);
+
+ return (unsigned char *)curr - sport->rx_buf;
+}
+EXPORT_SYMBOL(sport_curr_offset_rx);
+
+static irqreturn_t sport_tx_irq(int irq, void *dev_id)
+{
+ struct sport_device *sport = dev_id;
+ static unsigned long status;
+
+ status = get_dma_curr_irqstat(sport->tx_dma_chan);
+ if (status & (DMA_DONE|DMA_ERR)) {
+ clear_dma_irqstat(sport->tx_dma_chan);
+ SSYNC();
+ }
+ if (sport->tx_callback)
+ sport->tx_callback(sport->tx_data);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t sport_rx_irq(int irq, void *dev_id)
+{
+ struct sport_device *sport = dev_id;
+ unsigned long status;
+
+ status = get_dma_curr_irqstat(sport->rx_dma_chan);
+ if (status & (DMA_DONE|DMA_ERR)) {
+ clear_dma_irqstat(sport->rx_dma_chan);
+ SSYNC();
+ }
+ if (sport->rx_callback)
+ sport->rx_callback(sport->rx_data);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t sport_err_irq(int irq, void *dev_id)
+{
+ struct sport_device *sport = dev_id;
+ struct device *dev = &sport->pdev->dev;
+
+ if (sport->tx_regs->spctl & SPORT_CTL_DERRPRI)
+ dev_err(dev, "sport error: TUVF\n");
+ if (sport->rx_regs->spctl & SPORT_CTL_DERRPRI)
+ dev_err(dev, "sport error: ROVF\n");
+
+ return IRQ_HANDLED;
+}
+
+static int sport_get_resource(struct sport_device *sport)
+{
+ struct platform_device *pdev = sport->pdev;
+ struct device *dev = &pdev->dev;
+ struct bfin_snd_platform_data *pdata = dev->platform_data;
+ struct resource *res;
+
+ if (!pdata) {
+ dev_err(dev, "No platform data\n");
+ return -ENODEV;
+ }
+ sport->pin_req = pdata->pin_req;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "No tx MEM resource\n");
+ return -ENODEV;
+ }
+ sport->tx_regs = (struct sport_register *)res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res) {
+ dev_err(dev, "No rx MEM resource\n");
+ return -ENODEV;
+ }
+ sport->rx_regs = (struct sport_register *)res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!res) {
+ dev_err(dev, "No tx DMA resource\n");
+ return -ENODEV;
+ }
+ sport->tx_dma_chan = res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (!res) {
+ dev_err(dev, "No rx DMA resource\n");
+ return -ENODEV;
+ }
+ sport->rx_dma_chan = res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res) {
+ dev_err(dev, "No tx error irq resource\n");
+ return -ENODEV;
+ }
+ sport->tx_err_irq = res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
+ if (!res) {
+ dev_err(dev, "No rx error irq resource\n");
+ return -ENODEV;
+ }
+ sport->rx_err_irq = res->start;
+
+ return 0;
+}
+
+static int sport_request_resource(struct sport_device *sport)
+{
+ struct device *dev = &sport->pdev->dev;
+ int ret;
+
+ ret = peripheral_request_list(sport->pin_req, "soc-audio");
+ if (ret) {
+ dev_err(dev, "Unable to request sport pin\n");
+ return ret;
+ }
+
+ ret = request_dma(sport->tx_dma_chan, "SPORT TX Data");
+ if (ret) {
+ dev_err(dev, "Unable to allocate DMA channel for sport tx\n");
+ goto err_tx_dma;
+ }
+ set_dma_callback(sport->tx_dma_chan, sport_tx_irq, sport);
+
+ ret = request_dma(sport->rx_dma_chan, "SPORT RX Data");
+ if (ret) {
+ dev_err(dev, "Unable to allocate DMA channel for sport rx\n");
+ goto err_rx_dma;
+ }
+ set_dma_callback(sport->rx_dma_chan, sport_rx_irq, sport);
+
+ ret = request_irq(sport->tx_err_irq, sport_err_irq,
+ 0, "SPORT TX ERROR", sport);
+ if (ret) {
+ dev_err(dev, "Unable to allocate tx error IRQ for sport\n");
+ goto err_tx_irq;
+ }
+
+ ret = request_irq(sport->rx_err_irq, sport_err_irq,
+ 0, "SPORT RX ERROR", sport);
+ if (ret) {
+ dev_err(dev, "Unable to allocate rx error IRQ for sport\n");
+ goto err_rx_irq;
+ }
+
+ return 0;
+err_rx_irq:
+ free_irq(sport->tx_err_irq, sport);
+err_tx_irq:
+ free_dma(sport->rx_dma_chan);
+err_rx_dma:
+ free_dma(sport->tx_dma_chan);
+err_tx_dma:
+ peripheral_free_list(sport->pin_req);
+ return ret;
+}
+
+static void sport_free_resource(struct sport_device *sport)
+{
+ free_irq(sport->rx_err_irq, sport);
+ free_irq(sport->tx_err_irq, sport);
+ free_dma(sport->rx_dma_chan);
+ free_dma(sport->tx_dma_chan);
+ peripheral_free_list(sport->pin_req);
+}
+
+struct sport_device *sport_create(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct sport_device *sport;
+ int ret;
+
+ sport = kzalloc(sizeof(*sport), GFP_KERNEL);
+ if (!sport) {
+ dev_err(dev, "Unable to allocate memory for sport device\n");
+ return NULL;
+ }
+ sport->pdev = pdev;
+
+ ret = sport_get_resource(sport);
+ if (ret) {
+ kfree(sport);
+ return NULL;
+ }
+
+ ret = sport_request_resource(sport);
+ if (ret) {
+ kfree(sport);
+ return NULL;
+ }
+
+ dev_dbg(dev, "SPORT create success\n");
+ return sport;
+}
+EXPORT_SYMBOL(sport_create);
+
+void sport_delete(struct sport_device *sport)
+{
+ if (sport->tx_desc)
+ dma_free_coherent(NULL, sport->tx_desc_size,
+ sport->tx_desc, 0);
+ if (sport->rx_desc)
+ dma_free_coherent(NULL, sport->rx_desc_size,
+ sport->rx_desc, 0);
+ sport_free_resource(sport);
+ kfree(sport);
+}
+EXPORT_SYMBOL(sport_delete);
+
+MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
+MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff