1025 lines
26 KiB
C
1025 lines
26 KiB
C
/*
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* linux/arch/arm/plat-omap/mcbsp.c
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*
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* Copyright (C) 2004 Nokia Corporation
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* Author: Samuel Ortiz <samuel.ortiz@nokia.com>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Multichannel mode not supported.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/wait.h>
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#include <linux/completion.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/arch/dma.h>
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#include <asm/arch/mux.h>
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#include <asm/arch/irqs.h>
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#include <asm/arch/dsp_common.h>
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#include <asm/arch/mcbsp.h>
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#ifdef CONFIG_MCBSP_DEBUG
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#define DBG(x...) printk(x)
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#else
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#define DBG(x...) do { } while (0)
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#endif
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struct omap_mcbsp {
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u32 io_base;
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u8 id;
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u8 free;
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omap_mcbsp_word_length rx_word_length;
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omap_mcbsp_word_length tx_word_length;
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omap_mcbsp_io_type_t io_type; /* IRQ or poll */
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/* IRQ based TX/RX */
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int rx_irq;
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int tx_irq;
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/* DMA stuff */
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u8 dma_rx_sync;
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short dma_rx_lch;
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u8 dma_tx_sync;
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short dma_tx_lch;
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/* Completion queues */
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struct completion tx_irq_completion;
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struct completion rx_irq_completion;
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struct completion tx_dma_completion;
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struct completion rx_dma_completion;
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spinlock_t lock;
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};
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static struct omap_mcbsp mcbsp[OMAP_MAX_MCBSP_COUNT];
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#ifdef CONFIG_ARCH_OMAP1
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static struct clk *mcbsp_dsp_ck = 0;
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static struct clk *mcbsp_api_ck = 0;
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static struct clk *mcbsp_dspxor_ck = 0;
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#endif
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#ifdef CONFIG_ARCH_OMAP2
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static struct clk *mcbsp1_ick = 0;
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static struct clk *mcbsp1_fck = 0;
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static struct clk *mcbsp2_ick = 0;
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static struct clk *mcbsp2_fck = 0;
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#endif
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static void omap_mcbsp_dump_reg(u8 id)
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{
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DBG("**** MCBSP%d regs ****\n", mcbsp[id].id);
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DBG("DRR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DRR2));
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DBG("DRR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DRR1));
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DBG("DXR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DXR2));
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DBG("DXR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DXR1));
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DBG("SPCR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR2));
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DBG("SPCR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR1));
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DBG("RCR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, RCR2));
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DBG("RCR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, RCR1));
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DBG("XCR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, XCR2));
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DBG("XCR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, XCR1));
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DBG("SRGR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR2));
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DBG("SRGR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR1));
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DBG("PCR0: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, PCR0));
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DBG("***********************\n");
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}
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static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
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{
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struct omap_mcbsp * mcbsp_tx = (struct omap_mcbsp *)(dev_id);
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DBG("TX IRQ callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2));
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complete(&mcbsp_tx->tx_irq_completion);
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return IRQ_HANDLED;
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}
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static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
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{
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struct omap_mcbsp * mcbsp_rx = (struct omap_mcbsp *)(dev_id);
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DBG("RX IRQ callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR2));
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complete(&mcbsp_rx->rx_irq_completion);
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return IRQ_HANDLED;
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}
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static void omap_mcbsp_tx_dma_callback(int lch, u16 ch_status, void *data)
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{
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struct omap_mcbsp * mcbsp_dma_tx = (struct omap_mcbsp *)(data);
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DBG("TX DMA callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_dma_tx->io_base, SPCR2));
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/* We can free the channels */
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omap_free_dma(mcbsp_dma_tx->dma_tx_lch);
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mcbsp_dma_tx->dma_tx_lch = -1;
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complete(&mcbsp_dma_tx->tx_dma_completion);
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}
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static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data)
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{
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struct omap_mcbsp * mcbsp_dma_rx = (struct omap_mcbsp *)(data);
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DBG("RX DMA callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_dma_rx->io_base, SPCR2));
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/* We can free the channels */
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omap_free_dma(mcbsp_dma_rx->dma_rx_lch);
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mcbsp_dma_rx->dma_rx_lch = -1;
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complete(&mcbsp_dma_rx->rx_dma_completion);
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}
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/*
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* omap_mcbsp_config simply write a config to the
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* appropriate McBSP.
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* You either call this function or set the McBSP registers
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* by yourself before calling omap_mcbsp_start().
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*/
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void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg * config)
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{
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u32 io_base = mcbsp[id].io_base;
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DBG("OMAP-McBSP: McBSP%d io_base: 0x%8x\n", id+1, io_base);
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/* We write the given config */
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OMAP_MCBSP_WRITE(io_base, SPCR2, config->spcr2);
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OMAP_MCBSP_WRITE(io_base, SPCR1, config->spcr1);
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OMAP_MCBSP_WRITE(io_base, RCR2, config->rcr2);
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OMAP_MCBSP_WRITE(io_base, RCR1, config->rcr1);
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OMAP_MCBSP_WRITE(io_base, XCR2, config->xcr2);
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OMAP_MCBSP_WRITE(io_base, XCR1, config->xcr1);
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OMAP_MCBSP_WRITE(io_base, SRGR2, config->srgr2);
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OMAP_MCBSP_WRITE(io_base, SRGR1, config->srgr1);
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OMAP_MCBSP_WRITE(io_base, MCR2, config->mcr2);
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OMAP_MCBSP_WRITE(io_base, MCR1, config->mcr1);
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OMAP_MCBSP_WRITE(io_base, PCR0, config->pcr0);
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}
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static int omap_mcbsp_check(unsigned int id)
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{
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if (cpu_is_omap730()) {
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if (id > OMAP_MAX_MCBSP_COUNT - 1) {
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printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1);
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return -1;
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}
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return 0;
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}
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if (cpu_is_omap15xx() || cpu_is_omap16xx() || cpu_is_omap24xx()) {
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if (id > OMAP_MAX_MCBSP_COUNT) {
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printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1);
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return -1;
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}
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return 0;
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}
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return -1;
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}
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#ifdef CONFIG_ARCH_OMAP1
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static void omap_mcbsp_dsp_request(void)
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{
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if (cpu_is_omap15xx() || cpu_is_omap16xx()) {
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clk_enable(mcbsp_dsp_ck);
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clk_enable(mcbsp_api_ck);
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/* enable 12MHz clock to mcbsp 1 & 3 */
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clk_enable(mcbsp_dspxor_ck);
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/*
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* DSP external peripheral reset
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* FIXME: This should be moved to dsp code
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*/
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__raw_writew(__raw_readw(DSP_RSTCT2) | 1 | 1 << 1,
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DSP_RSTCT2);
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}
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}
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static void omap_mcbsp_dsp_free(void)
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{
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if (cpu_is_omap15xx() || cpu_is_omap16xx()) {
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clk_disable(mcbsp_dspxor_ck);
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clk_disable(mcbsp_dsp_ck);
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clk_disable(mcbsp_api_ck);
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}
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}
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#endif
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#ifdef CONFIG_ARCH_OMAP2
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static void omap2_mcbsp2_mux_setup(void)
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{
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omap_cfg_reg(Y15_24XX_MCBSP2_CLKX);
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omap_cfg_reg(R14_24XX_MCBSP2_FSX);
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omap_cfg_reg(W15_24XX_MCBSP2_DR);
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omap_cfg_reg(V15_24XX_MCBSP2_DX);
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omap_cfg_reg(V14_24XX_GPIO117);
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}
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#endif
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/*
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* We can choose between IRQ based or polled IO.
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* This needs to be called before omap_mcbsp_request().
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*/
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int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type)
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{
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if (omap_mcbsp_check(id) < 0)
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return -EINVAL;
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spin_lock(&mcbsp[id].lock);
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if (!mcbsp[id].free) {
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printk (KERN_ERR "OMAP-McBSP: McBSP%d is currently in use\n", id + 1);
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spin_unlock(&mcbsp[id].lock);
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return -EINVAL;
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}
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mcbsp[id].io_type = io_type;
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spin_unlock(&mcbsp[id].lock);
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return 0;
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}
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int omap_mcbsp_request(unsigned int id)
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{
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int err;
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if (omap_mcbsp_check(id) < 0)
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return -EINVAL;
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#ifdef CONFIG_ARCH_OMAP1
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/*
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* On 1510, 1610 and 1710, McBSP1 and McBSP3
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* are DSP public peripherals.
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*/
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if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3)
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omap_mcbsp_dsp_request();
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#endif
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#ifdef CONFIG_ARCH_OMAP2
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if (cpu_is_omap24xx()) {
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if (id == OMAP_MCBSP1) {
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clk_enable(mcbsp1_ick);
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clk_enable(mcbsp1_fck);
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} else {
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clk_enable(mcbsp2_ick);
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clk_enable(mcbsp2_fck);
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}
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}
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#endif
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spin_lock(&mcbsp[id].lock);
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if (!mcbsp[id].free) {
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printk (KERN_ERR "OMAP-McBSP: McBSP%d is currently in use\n", id + 1);
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spin_unlock(&mcbsp[id].lock);
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return -1;
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}
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mcbsp[id].free = 0;
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spin_unlock(&mcbsp[id].lock);
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if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) {
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/* We need to get IRQs here */
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err = request_irq(mcbsp[id].tx_irq, omap_mcbsp_tx_irq_handler, 0,
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"McBSP",
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(void *) (&mcbsp[id]));
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if (err != 0) {
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printk(KERN_ERR "OMAP-McBSP: Unable to request TX IRQ %d for McBSP%d\n",
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mcbsp[id].tx_irq, mcbsp[id].id);
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return err;
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}
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init_completion(&(mcbsp[id].tx_irq_completion));
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err = request_irq(mcbsp[id].rx_irq, omap_mcbsp_rx_irq_handler, 0,
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"McBSP",
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(void *) (&mcbsp[id]));
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if (err != 0) {
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printk(KERN_ERR "OMAP-McBSP: Unable to request RX IRQ %d for McBSP%d\n",
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mcbsp[id].rx_irq, mcbsp[id].id);
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free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
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return err;
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}
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init_completion(&(mcbsp[id].rx_irq_completion));
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}
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return 0;
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}
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void omap_mcbsp_free(unsigned int id)
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{
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if (omap_mcbsp_check(id) < 0)
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return;
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#ifdef CONFIG_ARCH_OMAP1
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if (cpu_class_is_omap1()) {
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if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3)
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omap_mcbsp_dsp_free();
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}
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#endif
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#ifdef CONFIG_ARCH_OMAP2
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if (cpu_is_omap24xx()) {
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if (id == OMAP_MCBSP1) {
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clk_disable(mcbsp1_ick);
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clk_disable(mcbsp1_fck);
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} else {
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clk_disable(mcbsp2_ick);
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clk_disable(mcbsp2_fck);
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}
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}
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#endif
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spin_lock(&mcbsp[id].lock);
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if (mcbsp[id].free) {
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printk (KERN_ERR "OMAP-McBSP: McBSP%d was not reserved\n", id + 1);
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spin_unlock(&mcbsp[id].lock);
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return;
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}
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mcbsp[id].free = 1;
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spin_unlock(&mcbsp[id].lock);
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if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) {
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/* Free IRQs */
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free_irq(mcbsp[id].rx_irq, (void *) (&mcbsp[id]));
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free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
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}
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}
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/*
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* Here we start the McBSP, by enabling the sample
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* generator, both transmitter and receivers,
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* and the frame sync.
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*/
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void omap_mcbsp_start(unsigned int id)
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{
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u32 io_base;
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u16 w;
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if (omap_mcbsp_check(id) < 0)
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return;
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io_base = mcbsp[id].io_base;
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mcbsp[id].rx_word_length = ((OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7);
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mcbsp[id].tx_word_length = ((OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7);
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/* Start the sample generator */
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w = OMAP_MCBSP_READ(io_base, SPCR2);
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OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 6));
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/* Enable transmitter and receiver */
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w = OMAP_MCBSP_READ(io_base, SPCR2);
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OMAP_MCBSP_WRITE(io_base, SPCR2, w | 1);
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w = OMAP_MCBSP_READ(io_base, SPCR1);
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OMAP_MCBSP_WRITE(io_base, SPCR1, w | 1);
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udelay(100);
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/* Start frame sync */
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w = OMAP_MCBSP_READ(io_base, SPCR2);
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OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 7));
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/* Dump McBSP Regs */
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omap_mcbsp_dump_reg(id);
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}
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void omap_mcbsp_stop(unsigned int id)
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{
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u32 io_base;
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u16 w;
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if (omap_mcbsp_check(id) < 0)
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return;
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io_base = mcbsp[id].io_base;
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/* Reset transmitter */
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w = OMAP_MCBSP_READ(io_base, SPCR2);
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OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1));
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/* Reset receiver */
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w = OMAP_MCBSP_READ(io_base, SPCR1);
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OMAP_MCBSP_WRITE(io_base, SPCR1, w & ~(1));
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/* Reset the sample rate generator */
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w = OMAP_MCBSP_READ(io_base, SPCR2);
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OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1 << 6));
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}
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/* polled mcbsp i/o operations */
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int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
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{
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u32 base = mcbsp[id].io_base;
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writew(buf, base + OMAP_MCBSP_REG_DXR1);
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/* if frame sync error - clear the error */
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if (readw(base + OMAP_MCBSP_REG_SPCR2) & XSYNC_ERR) {
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/* clear error */
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writew(readw(base + OMAP_MCBSP_REG_SPCR2) & (~XSYNC_ERR),
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base + OMAP_MCBSP_REG_SPCR2);
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/* resend */
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return -1;
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} else {
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/* wait for transmit confirmation */
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int attemps = 0;
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while (!(readw(base + OMAP_MCBSP_REG_SPCR2) & XRDY)) {
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if (attemps++ > 1000) {
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writew(readw(base + OMAP_MCBSP_REG_SPCR2) &
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(~XRST),
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base + OMAP_MCBSP_REG_SPCR2);
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udelay(10);
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writew(readw(base + OMAP_MCBSP_REG_SPCR2) |
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(XRST),
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base + OMAP_MCBSP_REG_SPCR2);
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udelay(10);
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printk(KERN_ERR
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|
" Could not write to McBSP Register\n");
|
|
return -2;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int omap_mcbsp_pollread(unsigned int id, u16 * buf)
|
|
{
|
|
u32 base = mcbsp[id].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);
|
|
printk(KERN_ERR
|
|
" Could not read from McBSP Register\n");
|
|
return -2;
|
|
}
|
|
}
|
|
}
|
|
*buf = readw(base + OMAP_MCBSP_REG_DRR1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* IRQ based word transmission.
|
|
*/
|
|
void omap_mcbsp_xmit_word(unsigned int id, u32 word)
|
|
{
|
|
u32 io_base;
|
|
omap_mcbsp_word_length word_length = mcbsp[id].tx_word_length;
|
|
|
|
if (omap_mcbsp_check(id) < 0)
|
|
return;
|
|
|
|
io_base = mcbsp[id].io_base;
|
|
|
|
wait_for_completion(&(mcbsp[id].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);
|
|
}
|
|
|
|
u32 omap_mcbsp_recv_word(unsigned int id)
|
|
{
|
|
u32 io_base;
|
|
u16 word_lsb, word_msb = 0;
|
|
omap_mcbsp_word_length word_length = mcbsp[id].rx_word_length;
|
|
|
|
if (omap_mcbsp_check(id) < 0)
|
|
return -EINVAL;
|
|
|
|
io_base = mcbsp[id].io_base;
|
|
|
|
wait_for_completion(&(mcbsp[id].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));
|
|
}
|
|
|
|
|
|
int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
|
|
{
|
|
u32 io_base = mcbsp[id].io_base;
|
|
omap_mcbsp_word_length tx_word_length = mcbsp[id].tx_word_length;
|
|
omap_mcbsp_word_length rx_word_length = mcbsp[id].rx_word_length;
|
|
u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
|
|
|
|
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);
|
|
printk("McBSP transmitter not ready\n");
|
|
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);
|
|
printk("McBSP receiver not ready\n");
|
|
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;
|
|
}
|
|
|
|
int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 * word)
|
|
{
|
|
u32 io_base = mcbsp[id].io_base, clock_word = 0;
|
|
omap_mcbsp_word_length tx_word_length = mcbsp[id].tx_word_length;
|
|
omap_mcbsp_word_length rx_word_length = mcbsp[id].rx_word_length;
|
|
u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
|
|
|
|
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);
|
|
printk("McBSP transmitter not ready\n");
|
|
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);
|
|
printk("McBSP receiver not ready\n");
|
|
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;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
int dma_tx_ch;
|
|
int src_port = 0;
|
|
int dest_port = 0;
|
|
int sync_dev = 0;
|
|
|
|
if (omap_mcbsp_check(id) < 0)
|
|
return -EINVAL;
|
|
|
|
if (omap_request_dma(mcbsp[id].dma_tx_sync, "McBSP TX", omap_mcbsp_tx_dma_callback,
|
|
&mcbsp[id],
|
|
&dma_tx_ch)) {
|
|
printk("OMAP-McBSP: Unable to request DMA channel for McBSP%d TX. Trying IRQ based TX\n", id+1);
|
|
return -EAGAIN;
|
|
}
|
|
mcbsp[id].dma_tx_lch = dma_tx_ch;
|
|
|
|
DBG("TX DMA on channel %d\n", dma_tx_ch);
|
|
|
|
init_completion(&(mcbsp[id].tx_dma_completion));
|
|
|
|
if (cpu_class_is_omap1()) {
|
|
src_port = OMAP_DMA_PORT_TIPB;
|
|
dest_port = OMAP_DMA_PORT_EMIFF;
|
|
}
|
|
if (cpu_is_omap24xx())
|
|
sync_dev = mcbsp[id].dma_tx_sync;
|
|
|
|
omap_set_dma_transfer_params(mcbsp[id].dma_tx_lch,
|
|
OMAP_DMA_DATA_TYPE_S16,
|
|
length >> 1, 1,
|
|
OMAP_DMA_SYNC_ELEMENT,
|
|
sync_dev, 0);
|
|
|
|
omap_set_dma_dest_params(mcbsp[id].dma_tx_lch,
|
|
src_port,
|
|
OMAP_DMA_AMODE_CONSTANT,
|
|
mcbsp[id].io_base + OMAP_MCBSP_REG_DXR1,
|
|
0, 0);
|
|
|
|
omap_set_dma_src_params(mcbsp[id].dma_tx_lch,
|
|
dest_port,
|
|
OMAP_DMA_AMODE_POST_INC,
|
|
buffer,
|
|
0, 0);
|
|
|
|
omap_start_dma(mcbsp[id].dma_tx_lch);
|
|
wait_for_completion(&(mcbsp[id].tx_dma_completion));
|
|
return 0;
|
|
}
|
|
|
|
|
|
int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer, unsigned int length)
|
|
{
|
|
int dma_rx_ch;
|
|
int src_port = 0;
|
|
int dest_port = 0;
|
|
int sync_dev = 0;
|
|
|
|
if (omap_mcbsp_check(id) < 0)
|
|
return -EINVAL;
|
|
|
|
if (omap_request_dma(mcbsp[id].dma_rx_sync, "McBSP RX", omap_mcbsp_rx_dma_callback,
|
|
&mcbsp[id],
|
|
&dma_rx_ch)) {
|
|
printk("Unable to request DMA channel for McBSP%d RX. Trying IRQ based RX\n", id+1);
|
|
return -EAGAIN;
|
|
}
|
|
mcbsp[id].dma_rx_lch = dma_rx_ch;
|
|
|
|
DBG("RX DMA on channel %d\n", dma_rx_ch);
|
|
|
|
init_completion(&(mcbsp[id].rx_dma_completion));
|
|
|
|
if (cpu_class_is_omap1()) {
|
|
src_port = OMAP_DMA_PORT_TIPB;
|
|
dest_port = OMAP_DMA_PORT_EMIFF;
|
|
}
|
|
if (cpu_is_omap24xx())
|
|
sync_dev = mcbsp[id].dma_rx_sync;
|
|
|
|
omap_set_dma_transfer_params(mcbsp[id].dma_rx_lch,
|
|
OMAP_DMA_DATA_TYPE_S16,
|
|
length >> 1, 1,
|
|
OMAP_DMA_SYNC_ELEMENT,
|
|
sync_dev, 0);
|
|
|
|
omap_set_dma_src_params(mcbsp[id].dma_rx_lch,
|
|
src_port,
|
|
OMAP_DMA_AMODE_CONSTANT,
|
|
mcbsp[id].io_base + OMAP_MCBSP_REG_DRR1,
|
|
0, 0);
|
|
|
|
omap_set_dma_dest_params(mcbsp[id].dma_rx_lch,
|
|
dest_port,
|
|
OMAP_DMA_AMODE_POST_INC,
|
|
buffer,
|
|
0, 0);
|
|
|
|
omap_start_dma(mcbsp[id].dma_rx_lch);
|
|
wait_for_completion(&(mcbsp[id].rx_dma_completion));
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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_reg_cfg mcbsp_cfg;
|
|
|
|
if (omap_mcbsp_check(id) < 0)
|
|
return;
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
/*
|
|
* McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
|
|
* 730 has only 2 McBSP, and both of them are MPU peripherals.
|
|
*/
|
|
struct omap_mcbsp_info {
|
|
u32 virt_base;
|
|
u8 dma_rx_sync, dma_tx_sync;
|
|
u16 rx_irq, tx_irq;
|
|
};
|
|
|
|
#ifdef CONFIG_ARCH_OMAP730
|
|
static const struct omap_mcbsp_info mcbsp_730[] = {
|
|
[0] = { .virt_base = io_p2v(OMAP730_MCBSP1_BASE),
|
|
.dma_rx_sync = OMAP_DMA_MCBSP1_RX,
|
|
.dma_tx_sync = OMAP_DMA_MCBSP1_TX,
|
|
.rx_irq = INT_730_McBSP1RX,
|
|
.tx_irq = INT_730_McBSP1TX },
|
|
[1] = { .virt_base = io_p2v(OMAP730_MCBSP2_BASE),
|
|
.dma_rx_sync = OMAP_DMA_MCBSP3_RX,
|
|
.dma_tx_sync = OMAP_DMA_MCBSP3_TX,
|
|
.rx_irq = INT_730_McBSP2RX,
|
|
.tx_irq = INT_730_McBSP2TX },
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_OMAP15XX
|
|
static const struct omap_mcbsp_info mcbsp_1510[] = {
|
|
[0] = { .virt_base = OMAP1510_MCBSP1_BASE,
|
|
.dma_rx_sync = OMAP_DMA_MCBSP1_RX,
|
|
.dma_tx_sync = OMAP_DMA_MCBSP1_TX,
|
|
.rx_irq = INT_McBSP1RX,
|
|
.tx_irq = INT_McBSP1TX },
|
|
[1] = { .virt_base = io_p2v(OMAP1510_MCBSP2_BASE),
|
|
.dma_rx_sync = OMAP_DMA_MCBSP2_RX,
|
|
.dma_tx_sync = OMAP_DMA_MCBSP2_TX,
|
|
.rx_irq = INT_1510_SPI_RX,
|
|
.tx_irq = INT_1510_SPI_TX },
|
|
[2] = { .virt_base = OMAP1510_MCBSP3_BASE,
|
|
.dma_rx_sync = OMAP_DMA_MCBSP3_RX,
|
|
.dma_tx_sync = OMAP_DMA_MCBSP3_TX,
|
|
.rx_irq = INT_McBSP3RX,
|
|
.tx_irq = INT_McBSP3TX },
|
|
};
|
|
#endif
|
|
|
|
#if defined(CONFIG_ARCH_OMAP16XX)
|
|
static const struct omap_mcbsp_info mcbsp_1610[] = {
|
|
[0] = { .virt_base = OMAP1610_MCBSP1_BASE,
|
|
.dma_rx_sync = OMAP_DMA_MCBSP1_RX,
|
|
.dma_tx_sync = OMAP_DMA_MCBSP1_TX,
|
|
.rx_irq = INT_McBSP1RX,
|
|
.tx_irq = INT_McBSP1TX },
|
|
[1] = { .virt_base = io_p2v(OMAP1610_MCBSP2_BASE),
|
|
.dma_rx_sync = OMAP_DMA_MCBSP2_RX,
|
|
.dma_tx_sync = OMAP_DMA_MCBSP2_TX,
|
|
.rx_irq = INT_1610_McBSP2_RX,
|
|
.tx_irq = INT_1610_McBSP2_TX },
|
|
[2] = { .virt_base = OMAP1610_MCBSP3_BASE,
|
|
.dma_rx_sync = OMAP_DMA_MCBSP3_RX,
|
|
.dma_tx_sync = OMAP_DMA_MCBSP3_TX,
|
|
.rx_irq = INT_McBSP3RX,
|
|
.tx_irq = INT_McBSP3TX },
|
|
};
|
|
#endif
|
|
|
|
#if defined(CONFIG_ARCH_OMAP24XX)
|
|
static const struct omap_mcbsp_info mcbsp_24xx[] = {
|
|
[0] = { .virt_base = IO_ADDRESS(OMAP24XX_MCBSP1_BASE),
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.dma_rx_sync = OMAP24XX_DMA_MCBSP1_RX,
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|
.dma_tx_sync = OMAP24XX_DMA_MCBSP1_TX,
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.rx_irq = INT_24XX_MCBSP1_IRQ_RX,
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|
.tx_irq = INT_24XX_MCBSP1_IRQ_TX,
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|
},
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[1] = { .virt_base = IO_ADDRESS(OMAP24XX_MCBSP2_BASE),
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.dma_rx_sync = OMAP24XX_DMA_MCBSP2_RX,
|
|
.dma_tx_sync = OMAP24XX_DMA_MCBSP2_TX,
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|
.rx_irq = INT_24XX_MCBSP2_IRQ_RX,
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.tx_irq = INT_24XX_MCBSP2_IRQ_TX,
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|
},
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|
};
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#endif
|
|
|
|
static int __init omap_mcbsp_init(void)
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|
{
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int mcbsp_count = 0, i;
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static const struct omap_mcbsp_info *mcbsp_info;
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|
|
|
printk("Initializing OMAP McBSP system\n");
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|
|
|
#ifdef CONFIG_ARCH_OMAP1
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|
mcbsp_dsp_ck = clk_get(0, "dsp_ck");
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|
if (IS_ERR(mcbsp_dsp_ck)) {
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|
printk(KERN_ERR "mcbsp: could not acquire dsp_ck handle.\n");
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|
return PTR_ERR(mcbsp_dsp_ck);
|
|
}
|
|
mcbsp_api_ck = clk_get(0, "api_ck");
|
|
if (IS_ERR(mcbsp_api_ck)) {
|
|
printk(KERN_ERR "mcbsp: could not acquire api_ck handle.\n");
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|
return PTR_ERR(mcbsp_api_ck);
|
|
}
|
|
mcbsp_dspxor_ck = clk_get(0, "dspxor_ck");
|
|
if (IS_ERR(mcbsp_dspxor_ck)) {
|
|
printk(KERN_ERR "mcbsp: could not acquire dspxor_ck handle.\n");
|
|
return PTR_ERR(mcbsp_dspxor_ck);
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_ARCH_OMAP2
|
|
mcbsp1_ick = clk_get(0, "mcbsp1_ick");
|
|
if (IS_ERR(mcbsp1_ick)) {
|
|
printk(KERN_ERR "mcbsp: could not acquire mcbsp1_ick handle.\n");
|
|
return PTR_ERR(mcbsp1_ick);
|
|
}
|
|
mcbsp1_fck = clk_get(0, "mcbsp1_fck");
|
|
if (IS_ERR(mcbsp1_fck)) {
|
|
printk(KERN_ERR "mcbsp: could not acquire mcbsp1_fck handle.\n");
|
|
return PTR_ERR(mcbsp1_fck);
|
|
}
|
|
mcbsp2_ick = clk_get(0, "mcbsp2_ick");
|
|
if (IS_ERR(mcbsp2_ick)) {
|
|
printk(KERN_ERR "mcbsp: could not acquire mcbsp2_ick handle.\n");
|
|
return PTR_ERR(mcbsp2_ick);
|
|
}
|
|
mcbsp2_fck = clk_get(0, "mcbsp2_fck");
|
|
if (IS_ERR(mcbsp2_fck)) {
|
|
printk(KERN_ERR "mcbsp: could not acquire mcbsp2_fck handle.\n");
|
|
return PTR_ERR(mcbsp2_fck);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_OMAP730
|
|
if (cpu_is_omap730()) {
|
|
mcbsp_info = mcbsp_730;
|
|
mcbsp_count = ARRAY_SIZE(mcbsp_730);
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_ARCH_OMAP15XX
|
|
if (cpu_is_omap15xx()) {
|
|
mcbsp_info = mcbsp_1510;
|
|
mcbsp_count = ARRAY_SIZE(mcbsp_1510);
|
|
}
|
|
#endif
|
|
#if defined(CONFIG_ARCH_OMAP16XX)
|
|
if (cpu_is_omap16xx()) {
|
|
mcbsp_info = mcbsp_1610;
|
|
mcbsp_count = ARRAY_SIZE(mcbsp_1610);
|
|
}
|
|
#endif
|
|
#if defined(CONFIG_ARCH_OMAP24XX)
|
|
if (cpu_is_omap24xx()) {
|
|
mcbsp_info = mcbsp_24xx;
|
|
mcbsp_count = ARRAY_SIZE(mcbsp_24xx);
|
|
omap2_mcbsp2_mux_setup();
|
|
}
|
|
#endif
|
|
for (i = 0; i < OMAP_MAX_MCBSP_COUNT ; i++) {
|
|
if (i >= mcbsp_count) {
|
|
mcbsp[i].io_base = 0;
|
|
mcbsp[i].free = 0;
|
|
continue;
|
|
}
|
|
mcbsp[i].id = i + 1;
|
|
mcbsp[i].free = 1;
|
|
mcbsp[i].dma_tx_lch = -1;
|
|
mcbsp[i].dma_rx_lch = -1;
|
|
|
|
mcbsp[i].io_base = mcbsp_info[i].virt_base;
|
|
mcbsp[i].io_type = OMAP_MCBSP_IRQ_IO; /* Default I/O is IRQ based */
|
|
mcbsp[i].tx_irq = mcbsp_info[i].tx_irq;
|
|
mcbsp[i].rx_irq = mcbsp_info[i].rx_irq;
|
|
mcbsp[i].dma_rx_sync = mcbsp_info[i].dma_rx_sync;
|
|
mcbsp[i].dma_tx_sync = mcbsp_info[i].dma_tx_sync;
|
|
spin_lock_init(&mcbsp[i].lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(omap_mcbsp_init);
|
|
|
|
EXPORT_SYMBOL(omap_mcbsp_config);
|
|
EXPORT_SYMBOL(omap_mcbsp_request);
|
|
EXPORT_SYMBOL(omap_mcbsp_set_io_type);
|
|
EXPORT_SYMBOL(omap_mcbsp_free);
|
|
EXPORT_SYMBOL(omap_mcbsp_start);
|
|
EXPORT_SYMBOL(omap_mcbsp_stop);
|
|
EXPORT_SYMBOL(omap_mcbsp_xmit_word);
|
|
EXPORT_SYMBOL(omap_mcbsp_recv_word);
|
|
EXPORT_SYMBOL(omap_mcbsp_xmit_buffer);
|
|
EXPORT_SYMBOL(omap_mcbsp_recv_buffer);
|
|
EXPORT_SYMBOL(omap_mcbsp_spi_master_xmit_word_poll);
|
|
EXPORT_SYMBOL(omap_mcbsp_spi_master_recv_word_poll);
|
|
EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);
|