diff options
Diffstat (limited to 'arch/arm/plat-omap/mcbsp.c')
| -rw-r--r-- | arch/arm/plat-omap/mcbsp.c | 975 |
1 files changed, 0 insertions, 975 deletions
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c deleted file mode 100644 index af33fc713e1..00000000000 --- a/arch/arm/plat-omap/mcbsp.c +++ /dev/null @@ -1,975 +0,0 @@ -/* - * linux/arch/arm/plat-omap/mcbsp.c - * - * Copyright (C) 2004 Nokia Corporation - * Author: Samuel Ortiz <samuel.ortiz@nokia.com> - * - * - * 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. - * - * Multichannel mode not supported. - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/device.h> -#include <linux/platform_device.h> -#include <linux/wait.h> -#include <linux/completion.h> -#include <linux/interrupt.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/delay.h> -#include <linux/io.h> - -#include <mach/dma.h> -#include <mach/mcbsp.h> - -struct omap_mcbsp **mcbsp_ptr; -int omap_mcbsp_count; - -void omap_mcbsp_write(void __iomem *io_base, u16 reg, u32 val) -{ - if (cpu_class_is_omap1() || cpu_is_omap2420()) - __raw_writew((u16)val, io_base + reg); - else - __raw_writel(val, io_base + reg); -} - -int omap_mcbsp_read(void __iomem *io_base, u16 reg) -{ - if (cpu_class_is_omap1() || cpu_is_omap2420()) - return __raw_readw(io_base + reg); - else - return __raw_readl(io_base + reg); -} - -#define OMAP_MCBSP_READ(base, reg) \ - omap_mcbsp_read(base, OMAP_MCBSP_REG_##reg) -#define OMAP_MCBSP_WRITE(base, reg, val) \ - omap_mcbsp_write(base, OMAP_MCBSP_REG_##reg, val) - -#define omap_mcbsp_check_valid_id(id) (id < omap_mcbsp_count) -#define id_to_mcbsp_ptr(id) mcbsp_ptr[id]; - -static void omap_mcbsp_dump_reg(u8 id) -{ - struct omap_mcbsp *mcbsp = id_to_mcbsp_ptr(id); - - dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id); - dev_dbg(mcbsp->dev, "DRR2: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, DRR2)); - dev_dbg(mcbsp->dev, "DRR1: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, DRR1)); - dev_dbg(mcbsp->dev, "DXR2: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, DXR2)); - dev_dbg(mcbsp->dev, "DXR1: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, DXR1)); - dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, SPCR2)); - dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, SPCR1)); - dev_dbg(mcbsp->dev, "RCR2: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, RCR2)); - dev_dbg(mcbsp->dev, "RCR1: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, RCR1)); - dev_dbg(mcbsp->dev, "XCR2: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, XCR2)); - dev_dbg(mcbsp->dev, "XCR1: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, XCR1)); - dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, SRGR2)); - dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, SRGR1)); - dev_dbg(mcbsp->dev, "PCR0: 0x%04x\n", - OMAP_MCBSP_READ(mcbsp->io_base, PCR0)); - dev_dbg(mcbsp->dev, "***********************\n"); -} - -static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id) -{ - struct omap_mcbsp *mcbsp_tx = dev_id; - - dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n", - OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2)); - - complete(&mcbsp_tx->tx_irq_completion); - - return IRQ_HANDLED; -} - -static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id) -{ - struct omap_mcbsp *mcbsp_rx = dev_id; - - dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n", - OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR2)); - - complete(&mcbsp_rx->rx_irq_completion); - - return IRQ_HANDLED; -} - -static void omap_mcbsp_tx_dma_callback(int lch, u16 ch_status, void *data) -{ - struct omap_mcbsp *mcbsp_dma_tx = data; - - dev_dbg(mcbsp_dma_tx->dev, "TX DMA callback : 0x%x\n", - OMAP_MCBSP_READ(mcbsp_dma_tx->io_base, SPCR2)); - - /* We can free the channels */ - omap_free_dma(mcbsp_dma_tx->dma_tx_lch); - mcbsp_dma_tx->dma_tx_lch = -1; - - complete(&mcbsp_dma_tx->tx_dma_completion); -} - -static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data) -{ - struct omap_mcbsp *mcbsp_dma_rx = data; - - dev_dbg(mcbsp_dma_rx->dev, "RX DMA callback : 0x%x\n", - OMAP_MCBSP_READ(mcbsp_dma_rx->io_base, SPCR2)); - - /* We can free the channels */ - omap_free_dma(mcbsp_dma_rx->dma_rx_lch); - mcbsp_dma_rx->dma_rx_lch = -1; - - complete(&mcbsp_dma_rx->rx_dma_completion); -} - -/* - * omap_mcbsp_config simply write a config to the - * appropriate McBSP. - * You either call this function or set the McBSP registers - * by yourself before calling omap_mcbsp_start(). - */ -void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config) -{ - struct omap_mcbsp *mcbsp; - void __iomem *io_base; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return; - } - mcbsp = id_to_mcbsp_ptr(id); - - io_base = mcbsp->io_base; - dev_dbg(mcbsp->dev, "Configuring McBSP%d phys_base: 0x%08lx\n", - mcbsp->id, mcbsp->phys_base); - - /* We write the given config */ - OMAP_MCBSP_WRITE(io_base, SPCR2, config->spcr2); - OMAP_MCBSP_WRITE(io_base, SPCR1, config->spcr1); - OMAP_MCBSP_WRITE(io_base, RCR2, config->rcr2); - OMAP_MCBSP_WRITE(io_base, RCR1, config->rcr1); - OMAP_MCBSP_WRITE(io_base, XCR2, config->xcr2); - OMAP_MCBSP_WRITE(io_base, XCR1, config->xcr1); - OMAP_MCBSP_WRITE(io_base, SRGR2, config->srgr2); - OMAP_MCBSP_WRITE(io_base, SRGR1, config->srgr1); - OMAP_MCBSP_WRITE(io_base, MCR2, config->mcr2); - OMAP_MCBSP_WRITE(io_base, MCR1, config->mcr1); - OMAP_MCBSP_WRITE(io_base, PCR0, config->pcr0); -} -EXPORT_SYMBOL(omap_mcbsp_config); - -/* - * We can choose between IRQ based or polled IO. - * This needs to be called before omap_mcbsp_request(). - */ -int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type) -{ - struct omap_mcbsp *mcbsp; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return -ENODEV; - } - mcbsp = id_to_mcbsp_ptr(id); - - spin_lock(&mcbsp->lock); - - if (!mcbsp->free) { - dev_err(mcbsp->dev, "McBSP%d is currently in use\n", - mcbsp->id); - spin_unlock(&mcbsp->lock); - return -EINVAL; - } - - mcbsp->io_type = io_type; - - spin_unlock(&mcbsp->lock); - - return 0; -} -EXPORT_SYMBOL(omap_mcbsp_set_io_type); - -int omap_mcbsp_request(unsigned int id) -{ - struct omap_mcbsp *mcbsp; - int err; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return -ENODEV; - } - mcbsp = id_to_mcbsp_ptr(id); - - if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request) - mcbsp->pdata->ops->request(id); - - clk_enable(mcbsp->clk); - - spin_lock(&mcbsp->lock); - if (!mcbsp->free) { - dev_err(mcbsp->dev, "McBSP%d is currently in use\n", - mcbsp->id); - spin_unlock(&mcbsp->lock); - return -1; - } - - mcbsp->free = 0; - spin_unlock(&mcbsp->lock); - - /* - * Make sure that transmitter, receiver and sample-rate generator are - * not running before activating IRQs. - */ - OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR1, 0); - OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR2, 0); - - if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) { - /* We need to get IRQs here */ - init_completion(&mcbsp->tx_irq_completion); - err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler, - 0, "McBSP", (void *)mcbsp); - if (err != 0) { - dev_err(mcbsp->dev, "Unable to request TX IRQ %d " - "for McBSP%d\n", mcbsp->tx_irq, - mcbsp->id); - return err; - } - - init_completion(&mcbsp->rx_irq_completion); - err = request_irq(mcbsp->rx_irq, omap_mcbsp_rx_irq_handler, - 0, "McBSP", (void *)mcbsp); - if (err != 0) { - dev_err(mcbsp->dev, "Unable to request RX IRQ %d " - "for McBSP%d\n", mcbsp->rx_irq, - mcbsp->id); - free_irq(mcbsp->tx_irq, (void *)mcbsp); - return err; - } - } - - return 0; -} -EXPORT_SYMBOL(omap_mcbsp_request); - -void omap_mcbsp_free(unsigned int id) -{ - struct omap_mcbsp *mcbsp; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return; - } - mcbsp = id_to_mcbsp_ptr(id); - - if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free) - mcbsp->pdata->ops->free(id); - - clk_disable(mcbsp->clk); - - spin_lock(&mcbsp->lock); - if (mcbsp->free) { - dev_err(mcbsp->dev, "McBSP%d was not reserved\n", - mcbsp->id); - spin_unlock(&mcbsp->lock); - return; - } - - mcbsp->free = 1; - spin_unlock(&mcbsp->lock); - - if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) { - /* Free IRQs */ - free_irq(mcbsp->rx_irq, (void *)mcbsp); - free_irq(mcbsp->tx_irq, (void *)mcbsp); - } -} -EXPORT_SYMBOL(omap_mcbsp_free); - -/* - * Here we start the McBSP, by enabling the sample - * generator, both transmitter and receivers, - * and the frame sync. - */ -void omap_mcbsp_start(unsigned int id) -{ - struct omap_mcbsp *mcbsp; - void __iomem *io_base; - u16 w; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return; - } - mcbsp = id_to_mcbsp_ptr(id); - io_base = mcbsp->io_base; - - mcbsp->rx_word_length = (OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7; - mcbsp->tx_word_length = (OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7; - - /* Start the sample generator */ - w = OMAP_MCBSP_READ(io_base, SPCR2); - OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 6)); - - /* Enable transmitter and receiver */ - w = OMAP_MCBSP_READ(io_base, SPCR2); - OMAP_MCBSP_WRITE(io_base, SPCR2, w | 1); - - w = OMAP_MCBSP_READ(io_base, SPCR1); - OMAP_MCBSP_WRITE(io_base, SPCR1, w | 1); - - udelay(100); - - /* Start frame sync */ - w = OMAP_MCBSP_READ(io_base, SPCR2); - OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 7)); - - /* Dump McBSP Regs */ - omap_mcbsp_dump_reg(id); -} -EXPORT_SYMBOL(omap_mcbsp_start); - -void omap_mcbsp_stop(unsigned int id) -{ - struct omap_mcbsp *mcbsp; - void __iomem *io_base; - u16 w; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return; - } - - mcbsp = id_to_mcbsp_ptr(id); - io_base = mcbsp->io_base; - - /* Reset transmitter */ - w = OMAP_MCBSP_READ(io_base, SPCR2); - OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1)); - - /* Reset receiver */ - w = OMAP_MCBSP_READ(io_base, SPCR1); - OMAP_MCBSP_WRITE(io_base, SPCR1, w & ~(1)); - - /* Reset the sample rate generator */ - w = OMAP_MCBSP_READ(io_base, SPCR2); - OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1 << 6)); -} -EXPORT_SYMBOL(omap_mcbsp_stop); - -/* polled mcbsp i/o operations */ -int omap_mcbsp_pollwrite(unsigned int id, u16 buf) -{ - struct omap_mcbsp *mcbsp; - void __iomem *base; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return -ENODEV; - } - - mcbsp = id_to_mcbsp_ptr(id); - base = mcbsp->io_base; - - writew(buf, base + OMAP_MCBSP_REG_DXR1); - /* if frame sync error - clear the error */ - if (readw(base + OMAP_MCBSP_REG_SPCR2) & XSYNC_ERR) { - /* clear error */ - writew(readw(base + OMAP_MCBSP_REG_SPCR2) & (~XSYNC_ERR), - base + OMAP_MCBSP_REG_SPCR2); - /* resend */ - return -1; - } else { - /* wait for transmit confirmation */ - int attemps = 0; - while (!(readw(base + OMAP_MCBSP_REG_SPCR2) & XRDY)) { - if (attemps++ > 1000) { - writew(readw(base + OMAP_MCBSP_REG_SPCR2) & - (~XRST), - base + OMAP_MCBSP_REG_SPCR2); - udelay(10); - writew(readw(base + OMAP_MCBSP_REG_SPCR2) | - (XRST), - base + OMAP_MCBSP_REG_SPCR2); - udelay(10); - dev_err(mcbsp->dev, "Could not write to" - " McBSP%d Register\n", mcbsp->id); - return -2; - } - } - } - - return 0; -} -EXPORT_SYMBOL(omap_mcbsp_pollwrite); - -int omap_mcbsp_pollread(unsigned int id, u16 *buf) -{ - struct omap_mcbsp *mcbsp; - void __iomem *base; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return -ENODEV; - } - mcbsp = id_to_mcbsp_ptr(id); - - base = mcbsp->io_base; - /* if frame sync error - clear the error */ - if (readw(base + OMAP_MCBSP_REG_SPCR1) & RSYNC_ERR) { - /* clear error */ - writew(readw(base + OMAP_MCBSP_REG_SPCR1) & (~RSYNC_ERR), - base + OMAP_MCBSP_REG_SPCR1); - /* resend */ - return -1; - } else { - /* wait for recieve confirmation */ - int attemps = 0; - while (!(readw(base + OMAP_MCBSP_REG_SPCR1) & RRDY)) { - if (attemps++ > 1000) { - writew(readw(base + OMAP_MCBSP_REG_SPCR1) & - (~RRST), - base + OMAP_MCBSP_REG_SPCR1); - udelay(10); - writew(readw(base + OMAP_MCBSP_REG_SPCR1) | - (RRST), - base + OMAP_MCBSP_REG_SPCR1); - udelay(10); - dev_err(mcbsp->dev, "Could not read from" - " McBSP%d Register\n", mcbsp->id); - return -2; - } - } - } - *buf = readw(base + OMAP_MCBSP_REG_DRR1); - - return 0; -} -EXPORT_SYMBOL(omap_mcbsp_pollread); - -/* - * IRQ based word transmission. - */ -void omap_mcbsp_xmit_word(unsigned int id, u32 word) -{ - struct omap_mcbsp *mcbsp; - void __iomem *io_base; - omap_mcbsp_word_length word_length; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return; - } - - mcbsp = id_to_mcbsp_ptr(id); - io_base = mcbsp->io_base; - word_length = mcbsp->tx_word_length; - - wait_for_completion(&mcbsp->tx_irq_completion); - - if (word_length > OMAP_MCBSP_WORD_16) - OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16); - OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff); -} -EXPORT_SYMBOL(omap_mcbsp_xmit_word); - -u32 omap_mcbsp_recv_word(unsigned int id) -{ - struct omap_mcbsp *mcbsp; - void __iomem *io_base; - u16 word_lsb, word_msb = 0; - omap_mcbsp_word_length word_length; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return -ENODEV; - } - mcbsp = id_to_mcbsp_ptr(id); - - word_length = mcbsp->rx_word_length; - io_base = mcbsp->io_base; - - wait_for_completion(&mcbsp->rx_irq_completion); - - if (word_length > OMAP_MCBSP_WORD_16) - word_msb = OMAP_MCBSP_READ(io_base, DRR2); - word_lsb = OMAP_MCBSP_READ(io_base, DRR1); - - return (word_lsb | (word_msb << 16)); -} -EXPORT_SYMBOL(omap_mcbsp_recv_word); - -int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word) -{ - struct omap_mcbsp *mcbsp; - void __iomem *io_base; - omap_mcbsp_word_length tx_word_length; - omap_mcbsp_word_length rx_word_length; - u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return -ENODEV; - } - mcbsp = id_to_mcbsp_ptr(id); - io_base = mcbsp->io_base; - tx_word_length = mcbsp->tx_word_length; - rx_word_length = mcbsp->rx_word_length; - - if (tx_word_length != rx_word_length) - return -EINVAL; - - /* First we wait for the transmitter to be ready */ - spcr2 = OMAP_MCBSP_READ(io_base, SPCR2); - while (!(spcr2 & XRDY)) { - spcr2 = OMAP_MCBSP_READ(io_base, SPCR2); - if (attempts++ > 1000) { - /* We must reset the transmitter */ - OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST)); - udelay(10); - OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST); - udelay(10); - dev_err(mcbsp->dev, "McBSP%d transmitter not " - "ready\n", mcbsp->id); - return -EAGAIN; - } - } - - /* Now we can push the data */ - if (tx_word_length > OMAP_MCBSP_WORD_16) - OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16); - OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff); - - /* We wait for the receiver to be ready */ - spcr1 = OMAP_MCBSP_READ(io_base, SPCR1); - while (!(spcr1 & RRDY)) { - spcr1 = OMAP_MCBSP_READ(io_base, SPCR1); - if (attempts++ > 1000) { - /* We must reset the receiver */ - OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST)); - udelay(10); - OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST); - udelay(10); - dev_err(mcbsp->dev, "McBSP%d receiver not " - "ready\n", mcbsp->id); - return -EAGAIN; - } - } - - /* Receiver is ready, let's read the dummy data */ - if (rx_word_length > OMAP_MCBSP_WORD_16) - word_msb = OMAP_MCBSP_READ(io_base, DRR2); - word_lsb = OMAP_MCBSP_READ(io_base, DRR1); - - return 0; -} -EXPORT_SYMBOL(omap_mcbsp_spi_master_xmit_word_poll); - -int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word) -{ - struct omap_mcbsp *mcbsp; - u32 clock_word = 0; - void __iomem *io_base; - omap_mcbsp_word_length tx_word_length; - omap_mcbsp_word_length rx_word_length; - u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return -ENODEV; - } - - mcbsp = id_to_mcbsp_ptr(id); - io_base = mcbsp->io_base; - - tx_word_length = mcbsp->tx_word_length; - rx_word_length = mcbsp->rx_word_length; - - if (tx_word_length != rx_word_length) - return -EINVAL; - - /* First we wait for the transmitter to be ready */ - spcr2 = OMAP_MCBSP_READ(io_base, SPCR2); - while (!(spcr2 & XRDY)) { - spcr2 = OMAP_MCBSP_READ(io_base, SPCR2); - if (attempts++ > 1000) { - /* We must reset the transmitter */ - OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST)); - udelay(10); - OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST); - udelay(10); - dev_err(mcbsp->dev, "McBSP%d transmitter not " - "ready\n", mcbsp->id); - return -EAGAIN; - } - } - - /* We first need to enable the bus clock */ - if (tx_word_length > OMAP_MCBSP_WORD_16) - OMAP_MCBSP_WRITE(io_base, DXR2, clock_word >> 16); - OMAP_MCBSP_WRITE(io_base, DXR1, clock_word & 0xffff); - - /* We wait for the receiver to be ready */ - spcr1 = OMAP_MCBSP_READ(io_base, SPCR1); - while (!(spcr1 & RRDY)) { - spcr1 = OMAP_MCBSP_READ(io_base, SPCR1); - if (attempts++ > 1000) { - /* We must reset the receiver */ - OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST)); - udelay(10); - OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST); - udelay(10); - dev_err(mcbsp->dev, "McBSP%d receiver not " - "ready\n", mcbsp->id); - return -EAGAIN; - } - } - - /* Receiver is ready, there is something for us */ - if (rx_word_length > OMAP_MCBSP_WORD_16) - word_msb = OMAP_MCBSP_READ(io_base, DRR2); - word_lsb = OMAP_MCBSP_READ(io_base, DRR1); - - word[0] = (word_lsb | (word_msb << 16)); - - return 0; -} -EXPORT_SYMBOL(omap_mcbsp_spi_master_recv_word_poll); - -/* - * Simple DMA based buffer rx/tx routines. - * Nothing fancy, just a single buffer tx/rx through DMA. - * The DMA resources are released once the transfer is done. - * For anything fancier, you should use your own customized DMA - * routines and callbacks. - */ -int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer, - unsigned int length) -{ - struct omap_mcbsp *mcbsp; - int dma_tx_ch; - int src_port = 0; - int dest_port = 0; - int sync_dev = 0; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return -ENODEV; - } - mcbsp = id_to_mcbsp_ptr(id); - - if (omap_request_dma(mcbsp->dma_tx_sync, "McBSP TX", - omap_mcbsp_tx_dma_callback, - mcbsp, - &dma_tx_ch)) { - dev_err(mcbsp->dev, " Unable to request DMA channel for " - "McBSP%d TX. Trying IRQ based TX\n", - mcbsp->id); - return -EAGAIN; - } - mcbsp->dma_tx_lch = dma_tx_ch; - - dev_err(mcbsp->dev, "McBSP%d TX DMA on channel %d\n", mcbsp->id, - dma_tx_ch); - - init_completion(&mcbsp->tx_dma_completion); - - if (cpu_class_is_omap1()) { - src_port = OMAP_DMA_PORT_TIPB; - dest_port = OMAP_DMA_PORT_EMIFF; - } - if (cpu_class_is_omap2()) - sync_dev = mcbsp->dma_tx_sync; - - omap_set_dma_transfer_params(mcbsp->dma_tx_lch, - OMAP_DMA_DATA_TYPE_S16, - length >> 1, 1, - OMAP_DMA_SYNC_ELEMENT, - sync_dev, 0); - - omap_set_dma_dest_params(mcbsp->dma_tx_lch, - src_port, - OMAP_DMA_AMODE_CONSTANT, - mcbsp->phys_base + OMAP_MCBSP_REG_DXR1, - 0, 0); - - omap_set_dma_src_params(mcbsp->dma_tx_lch, - dest_port, - OMAP_DMA_AMODE_POST_INC, - buffer, - 0, 0); - - omap_start_dma(mcbsp->dma_tx_lch); - wait_for_completion(&mcbsp->tx_dma_completion); - - return 0; -} -EXPORT_SYMBOL(omap_mcbsp_xmit_buffer); - -int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer, - unsigned int length) -{ - struct omap_mcbsp *mcbsp; - int dma_rx_ch; - int src_port = 0; - int dest_port = 0; - int sync_dev = 0; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return -ENODEV; - } - mcbsp = id_to_mcbsp_ptr(id); - - if (omap_request_dma(mcbsp->dma_rx_sync, "McBSP RX", - omap_mcbsp_rx_dma_callback, - mcbsp, - &dma_rx_ch)) { - dev_err(mcbsp->dev, "Unable to request DMA channel for " - "McBSP%d RX. Trying IRQ based RX\n", - mcbsp->id); - return -EAGAIN; - } - mcbsp->dma_rx_lch = dma_rx_ch; - - dev_err(mcbsp->dev, "McBSP%d RX DMA on channel %d\n", mcbsp->id, - dma_rx_ch); - - init_completion(&mcbsp->rx_dma_completion); - - if (cpu_class_is_omap1()) { - src_port = OMAP_DMA_PORT_TIPB; - dest_port = OMAP_DMA_PORT_EMIFF; - } - if (cpu_class_is_omap2()) - sync_dev = mcbsp->dma_rx_sync; - - omap_set_dma_transfer_params(mcbsp->dma_rx_lch, - OMAP_DMA_DATA_TYPE_S16, - length >> 1, 1, - OMAP_DMA_SYNC_ELEMENT, - sync_dev, 0); - - omap_set_dma_src_params(mcbsp->dma_rx_lch, - src_port, - OMAP_DMA_AMODE_CONSTANT, - mcbsp->phys_base + OMAP_MCBSP_REG_DRR1, - 0, 0); - - omap_set_dma_dest_params(mcbsp->dma_rx_lch, - dest_port, - OMAP_DMA_AMODE_POST_INC, - buffer, - 0, 0); - - omap_start_dma(mcbsp->dma_rx_lch); - wait_for_completion(&mcbsp->rx_dma_completion); - - return 0; -} -EXPORT_SYMBOL(omap_mcbsp_recv_buffer); - -/* - * SPI wrapper. - * Since SPI setup is much simpler than the generic McBSP one, - * this wrapper just need an omap_mcbsp_spi_cfg structure as an input. - * Once this is done, you can call omap_mcbsp_start(). - */ -void omap_mcbsp_set_spi_mode(unsigned int id, - const struct omap_mcbsp_spi_cfg *spi_cfg) -{ - struct omap_mcbsp *mcbsp; - struct omap_mcbsp_reg_cfg mcbsp_cfg; - - if (!omap_mcbsp_check_valid_id(id)) { - printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); - return; - } - mcbsp = id_to_mcbsp_ptr(id); - - memset(&mcbsp_cfg, 0, sizeof(struct omap_mcbsp_reg_cfg)); - - /* SPI has only one frame */ - mcbsp_cfg.rcr1 |= (RWDLEN1(spi_cfg->word_length) | RFRLEN1(0)); - mcbsp_cfg.xcr1 |= (XWDLEN1(spi_cfg->word_length) | XFRLEN1(0)); - - /* Clock stop mode */ - if (spi_cfg->clk_stp_mode == OMAP_MCBSP_CLK_STP_MODE_NO_DELAY) - mcbsp_cfg.spcr1 |= (1 << 12); - else - mcbsp_cfg.spcr1 |= (3 << 11); - - /* Set clock parities */ - if (spi_cfg->rx_clock_polarity == OMAP_MCBSP_CLK_RISING) - mcbsp_cfg.pcr0 |= CLKRP; - else - mcbsp_cfg.pcr0 &= ~CLKRP; - - if (spi_cfg->tx_clock_polarity == OMAP_MCBSP_CLK_RISING) - mcbsp_cfg.pcr0 &= ~CLKXP; - else - mcbsp_cfg.pcr0 |= CLKXP; - - /* Set SCLKME to 0 and CLKSM to 1 */ - mcbsp_cfg.pcr0 &= ~SCLKME; - mcbsp_cfg.srgr2 |= CLKSM; - - /* Set FSXP */ - if (spi_cfg->fsx_polarity == OMAP_MCBSP_FS_ACTIVE_HIGH) - mcbsp_cfg.pcr0 &= ~FSXP; - else - mcbsp_cfg.pcr0 |= FSXP; - - if (spi_cfg->spi_mode == OMAP_MCBSP_SPI_MASTER) { - mcbsp_cfg.pcr0 |= CLKXM; - mcbsp_cfg.srgr1 |= CLKGDV(spi_cfg->clk_div - 1); - mcbsp_cfg.pcr0 |= FSXM; - mcbsp_cfg.srgr2 &= ~FSGM; - mcbsp_cfg.xcr2 |= XDATDLY(1); - mcbsp_cfg.rcr2 |= RDATDLY(1); - } else { - mcbsp_cfg.pcr0 &= ~CLKXM; - mcbsp_cfg.srgr1 |= CLKGDV(1); - mcbsp_cfg.pcr0 &= ~FSXM; - mcbsp_cfg.xcr2 &= ~XDATDLY(3); - mcbsp_cfg.rcr2 &= ~RDATDLY(3); - } - - mcbsp_cfg.xcr2 &= ~XPHASE; - mcbsp_cfg.rcr2 &= ~RPHASE; - - omap_mcbsp_config(id, &mcbsp_cfg); -} -EXPORT_SYMBOL(omap_mcbsp_set_spi_mode); - -/* - * McBSP1 and McBSP3 are directly mapped on 1610 and 1510. - * 730 has only 2 McBSP, and both of them are MPU peripherals. - */ -static int __devinit omap_mcbsp_probe(struct platform_device *pdev) -{ - struct omap_mcbsp_platform_data *pdata = pdev->dev.platform_data; - struct omap_mcbsp *mcbsp; - int id = pdev->id - 1; - int ret = 0; - - if (!pdata) { - dev_err(&pdev->dev, "McBSP device initialized without" - "platform data\n"); - ret = -EINVAL; - goto exit; - } - - dev_dbg(&pdev->dev, "Initializing OMAP McBSP (%d).\n", pdev->id); - - if (id >= omap_mcbsp_count) { - dev_err(&pdev->dev, "Invalid McBSP device id (%d)\n", id); - ret = -EINVAL; - goto exit; - } - - mcbsp = kzalloc(sizeof(struct omap_mcbsp), GFP_KERNEL); - if (!mcbsp) { - ret = -ENOMEM; - goto exit; - } - mcbsp_ptr[id] = mcbsp; - - spin_lock_init(&mcbsp->lock); - mcbsp->id = id + 1; - mcbsp->free = 1; - mcbsp->dma_tx_lch = -1; - mcbsp->dma_rx_lch = -1; - - mcbsp->phys_base = pdata->phys_base; - mcbsp->io_base = ioremap(pdata->phys_base, SZ_4K); - if (!mcbsp->io_base) { - ret = -ENOMEM; - goto err_ioremap; - } - - /* Default I/O is IRQ based */ - mcbsp->io_type = OMAP_MCBSP_IRQ_IO; - mcbsp->tx_irq = pdata->tx_irq; - mcbsp->rx_irq = pdata->rx_irq; - mcbsp->dma_rx_sync = pdata->dma_rx_sync; - mcbsp->dma_tx_sync = pdata->dma_tx_sync; - - if (pdata->clk_name) - mcbsp->clk = clk_get(&pdev->dev, pdata->clk_name); - if (IS_ERR(mcbsp->clk)) { - dev_err(&pdev->dev, - "Invalid clock configuration for McBSP%d.\n", - mcbsp->id); - ret = PTR_ERR(mcbsp->clk); - goto err_clk; - } - - mcbsp->pdata = pdata; - mcbsp->dev = &pdev->dev; - platform_set_drvdata(pdev, mcbsp); - return 0; - -err_clk: - iounmap(mcbsp->io_base); -err_ioremap: - mcbsp->free = 0; -exit: - return ret; -} - -static int __devexit omap_mcbsp_remove(struct platform_device *pdev) -{ - struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev); - - platform_set_drvdata(pdev, NULL); - if (mcbsp) { - - if (mcbsp->pdata && mcbsp->pdata->ops && - mcbsp->pdata->ops->free) - mcbsp->pdata->ops->free(mcbsp->id); - - clk_disable(mcbsp->clk); - clk_put(mcbsp->clk); - - iounmap(mcbsp->io_base); - - mcbsp->clk = NULL; - mcbsp->free = 0; - mcbsp->dev = NULL; - } - - return 0; -} - -static struct platform_driver omap_mcbsp_driver = { - .probe = omap_mcbsp_probe, - .remove = __devexit_p(omap_mcbsp_remove), - .driver = { - .name = "omap-mcbsp", - }, -}; - -int __init omap_mcbsp_init(void) -{ - /* Register the McBSP driver */ - return platform_driver_register(&omap_mcbsp_driver); -} - |