/* * 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; u16 irqst_spcr2; irqst_spcr2 = OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2); dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2); if (irqst_spcr2 & XSYNC_ERR) { dev_err(mcbsp_tx->dev, "TX Frame Sync Error! : 0x%x\n", irqst_spcr2); /* Writing zero to XSYNC_ERR clears the IRQ */ OMAP_MCBSP_WRITE(mcbsp_tx->io_base, SPCR2, irqst_spcr2 & ~(XSYNC_ERR)); } else { 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; u16 irqst_spcr1; irqst_spcr1 = OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR1); dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1); if (irqst_spcr1 & RSYNC_ERR) { dev_err(mcbsp_rx->dev, "RX Frame Sync Error! : 0x%x\n", irqst_spcr1); /* Writing zero to RSYNC_ERR clears the IRQ */ OMAP_MCBSP_WRITE(mcbsp_rx->io_base, SPCR1, irqst_spcr1 & ~(RSYNC_ERR)); } else { complete(&mcbsp_rx->tx_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); if (cpu_is_omap2430() || cpu_is_omap34xx()) { OMAP_MCBSP_WRITE(io_base, XCCR, config->xccr); OMAP_MCBSP_WRITE(io_base, RCCR, config->rccr); } } 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); 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 -EBUSY; } mcbsp->free = 0; spin_unlock(&mcbsp->lock); if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request) mcbsp->pdata->ops->request(id); clk_enable(mcbsp->iclk); clk_enable(mcbsp->fclk); /* * 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->fclk); clk_disable(mcbsp->iclk); if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) { /* Free IRQs */ free_irq(mcbsp->rx_irq, (void *)mcbsp); free_irq(mcbsp->tx_irq, (void *)mcbsp); } 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); } EXPORT_SYMBOL(omap_mcbsp_free); /* * Here we start the McBSP, by enabling transmitter, receiver or both. * If no transmitter or receiver is active prior calling, then sample-rate * generator and frame sync are started. */ void omap_mcbsp_start(unsigned int id, int tx, int rx) { struct omap_mcbsp *mcbsp; void __iomem *io_base; int idle; 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; idle = !((OMAP_MCBSP_READ(io_base, SPCR2) | OMAP_MCBSP_READ(io_base, SPCR1)) & 1); if (idle) { /* 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 | (tx & 1)); w = OMAP_MCBSP_READ(io_base, SPCR1); OMAP_MCBSP_WRITE(io_base, SPCR1, w | (rx & 1)); udelay(100); if (idle) { /* 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, int tx, int rx) { struct omap_mcbsp *mcbsp; void __iomem *io_base; int idle; 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 & ~(tx & 1)); /* Reset receiver */ w = OMAP_MCBSP_READ(io_base, SPCR1); OMAP_MCBSP_WRITE(io_base, SPCR1, w & ~(rx & 1)); idle = !((OMAP_MCBSP_READ(io_base, SPCR2) | OMAP_MCBSP_READ(io_base, SPCR1)) & 1); if (idle) { /* 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; } 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; mcbsp->iclk = clk_get(&pdev->dev, "ick"); if (IS_ERR(mcbsp->iclk)) { ret = PTR_ERR(mcbsp->iclk); dev_err(&pdev->dev, "unable to get ick: %d\n", ret); goto err_iclk; } mcbsp->fclk = clk_get(&pdev->dev, "fck"); if (IS_ERR(mcbsp->fclk)) { ret = PTR_ERR(mcbsp->fclk); dev_err(&pdev->dev, "unable to get fck: %d\n", ret); goto err_fclk; } mcbsp->pdata = pdata; mcbsp->dev = &pdev->dev; mcbsp_ptr[id] = mcbsp; platform_set_drvdata(pdev, mcbsp); return 0; err_fclk: clk_put(mcbsp->iclk); err_iclk: iounmap(mcbsp->io_base); err_ioremap: kfree(mcbsp); 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->fclk); clk_disable(mcbsp->iclk); clk_put(mcbsp->fclk); clk_put(mcbsp->iclk); iounmap(mcbsp->io_base); mcbsp->fclk = NULL; mcbsp->iclk = 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); }