diff options
Diffstat (limited to 'arch/arm/plat-omap/mcbsp.c')
| -rw-r--r-- | arch/arm/plat-omap/mcbsp.c | 1044 |
1 files changed, 0 insertions, 1044 deletions
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c deleted file mode 100644 index 9cf83c4da9f..00000000000 --- a/arch/arm/plat-omap/mcbsp.c +++ /dev/null @@ -1,1044 +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/wait.h> -#include <linux/completion.h> -#include <linux/interrupt.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/delay.h> - -#include <asm/io.h> -#include <asm/irq.h> - -#include <asm/arch/dma.h> -#include <asm/arch/mux.h> -#include <asm/arch/irqs.h> -#include <asm/arch/dsp_common.h> -#include <asm/arch/mcbsp.h> - -#ifdef CONFIG_MCBSP_DEBUG -#define DBG(x...) printk(x) -#else -#define DBG(x...) do { } while (0) -#endif - -struct omap_mcbsp { - u32 io_base; - u8 id; - u8 free; - omap_mcbsp_word_length rx_word_length; - omap_mcbsp_word_length tx_word_length; - - omap_mcbsp_io_type_t io_type; /* IRQ or poll */ - /* IRQ based TX/RX */ - int rx_irq; - int tx_irq; - - /* DMA stuff */ - u8 dma_rx_sync; - short dma_rx_lch; - u8 dma_tx_sync; - short dma_tx_lch; - - /* Completion queues */ - struct completion tx_irq_completion; - struct completion rx_irq_completion; - struct completion tx_dma_completion; - struct completion rx_dma_completion; - - spinlock_t lock; -}; - -static struct omap_mcbsp mcbsp[OMAP_MAX_MCBSP_COUNT]; -#ifdef CONFIG_ARCH_OMAP1 -static struct clk *mcbsp_dsp_ck = 0; -static struct clk *mcbsp_api_ck = 0; -static struct clk *mcbsp_dspxor_ck = 0; -#endif -#ifdef CONFIG_ARCH_OMAP2 -static struct clk *mcbsp1_ick = 0; -static struct clk *mcbsp1_fck = 0; -static struct clk *mcbsp2_ick = 0; -static struct clk *mcbsp2_fck = 0; -#endif - -static void omap_mcbsp_dump_reg(u8 id) -{ - DBG("**** MCBSP%d regs ****\n", mcbsp[id].id); - DBG("DRR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DRR2)); - DBG("DRR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DRR1)); - DBG("DXR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DXR2)); - DBG("DXR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DXR1)); - DBG("SPCR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR2)); - DBG("SPCR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR1)); - DBG("RCR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, RCR2)); - DBG("RCR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, RCR1)); - DBG("XCR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, XCR2)); - DBG("XCR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, XCR1)); - DBG("SRGR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR2)); - DBG("SRGR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR1)); - DBG("PCR0: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, PCR0)); - DBG("***********************\n"); -} - -static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id) -{ - struct omap_mcbsp *mcbsp_tx = dev_id; - - DBG("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; - - DBG("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; - - DBG("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; - - DBG("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) -{ - u32 io_base = mcbsp[id].io_base; - - DBG("OMAP-McBSP: McBSP%d io_base: 0x%8x\n", id+1, io_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); -} - - - -static int omap_mcbsp_check(unsigned int id) -{ - if (cpu_is_omap730()) { - if (id > OMAP_MAX_MCBSP_COUNT - 1) { - printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1); - return -1; - } - return 0; - } - - if (cpu_is_omap15xx() || cpu_is_omap16xx() || cpu_is_omap24xx()) { - if (id > OMAP_MAX_MCBSP_COUNT) { - printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1); - return -1; - } - return 0; - } - - return -1; -} - -#ifdef CONFIG_ARCH_OMAP1 -static void omap_mcbsp_dsp_request(void) -{ - if (cpu_is_omap15xx() || cpu_is_omap16xx()) { - int ret; - - ret = omap_dsp_request_mem(); - if (ret < 0) { - printk(KERN_ERR "Could not get dsp memory: %i\n", ret); - return; - } - - clk_enable(mcbsp_dsp_ck); - clk_enable(mcbsp_api_ck); - - /* enable 12MHz clock to mcbsp 1 & 3 */ - clk_enable(mcbsp_dspxor_ck); - - /* - * DSP external peripheral reset - * FIXME: This should be moved to dsp code - */ - __raw_writew(__raw_readw(DSP_RSTCT2) | 1 | 1 << 1, - DSP_RSTCT2); - } -} - -static void omap_mcbsp_dsp_free(void) -{ - if (cpu_is_omap15xx() || cpu_is_omap16xx()) { - omap_dsp_release_mem(); - clk_disable(mcbsp_dspxor_ck); - clk_disable(mcbsp_dsp_ck); - clk_disable(mcbsp_api_ck); - } -} -#endif - -#ifdef CONFIG_ARCH_OMAP2 -static void omap2_mcbsp2_mux_setup(void) -{ - if (cpu_is_omap2420()) { - omap_cfg_reg(Y15_24XX_MCBSP2_CLKX); - omap_cfg_reg(R14_24XX_MCBSP2_FSX); - omap_cfg_reg(W15_24XX_MCBSP2_DR); - omap_cfg_reg(V15_24XX_MCBSP2_DX); - omap_cfg_reg(V14_24XX_GPIO117); - } - /* - * Need to add MUX settings for OMAP 2430 SDP - */ -} -#endif - -/* - * 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) -{ - if (omap_mcbsp_check(id) < 0) - return -EINVAL; - - spin_lock(&mcbsp[id].lock); - - if (!mcbsp[id].free) { - printk (KERN_ERR "OMAP-McBSP: McBSP%d is currently in use\n", id + 1); - spin_unlock(&mcbsp[id].lock); - return -EINVAL; - } - - mcbsp[id].io_type = io_type; - - spin_unlock(&mcbsp[id].lock); - - return 0; -} - -int omap_mcbsp_request(unsigned int id) -{ - int err; - - if (omap_mcbsp_check(id) < 0) - return -EINVAL; - -#ifdef CONFIG_ARCH_OMAP1 - /* - * On 1510, 1610 and 1710, McBSP1 and McBSP3 - * are DSP public peripherals. - */ - if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3) - omap_mcbsp_dsp_request(); -#endif - -#ifdef CONFIG_ARCH_OMAP2 - if (cpu_is_omap24xx()) { - if (id == OMAP_MCBSP1) { - clk_enable(mcbsp1_ick); - clk_enable(mcbsp1_fck); - } else { - clk_enable(mcbsp2_ick); - clk_enable(mcbsp2_fck); - } - } -#endif - - spin_lock(&mcbsp[id].lock); - if (!mcbsp[id].free) { - printk (KERN_ERR "OMAP-McBSP: McBSP%d is currently in use\n", id + 1); - spin_unlock(&mcbsp[id].lock); - return -1; - } - - mcbsp[id].free = 0; - spin_unlock(&mcbsp[id].lock); - - if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) { - /* We need to get IRQs here */ - err = request_irq(mcbsp[id].tx_irq, omap_mcbsp_tx_irq_handler, 0, - "McBSP", - (void *) (&mcbsp[id])); - if (err != 0) { - printk(KERN_ERR "OMAP-McBSP: Unable to request TX IRQ %d for McBSP%d\n", - mcbsp[id].tx_irq, mcbsp[id].id); - return err; - } - - init_completion(&(mcbsp[id].tx_irq_completion)); - - - err = request_irq(mcbsp[id].rx_irq, omap_mcbsp_rx_irq_handler, 0, - "McBSP", - (void *) (&mcbsp[id])); - if (err != 0) { - printk(KERN_ERR "OMAP-McBSP: Unable to request RX IRQ %d for McBSP%d\n", - mcbsp[id].rx_irq, mcbsp[id].id); - free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id])); - return err; - } - - init_completion(&(mcbsp[id].rx_irq_completion)); - } - - return 0; - -} - -void omap_mcbsp_free(unsigned int id) -{ - if (omap_mcbsp_check(id) < 0) - return; - -#ifdef CONFIG_ARCH_OMAP1 - if (cpu_class_is_omap1()) { - if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3) - omap_mcbsp_dsp_free(); - } -#endif - -#ifdef CONFIG_ARCH_OMAP2 - if (cpu_is_omap24xx()) { - if (id == OMAP_MCBSP1) { - clk_disable(mcbsp1_ick); - clk_disable(mcbsp1_fck); - } else { - clk_disable(mcbsp2_ick); - clk_disable(mcbsp2_fck); - } - } -#endif - - spin_lock(&mcbsp[id].lock); - if (mcbsp[id].free) { - printk (KERN_ERR "OMAP-McBSP: McBSP%d was not reserved\n", id + 1); - spin_unlock(&mcbsp[id].lock); - return; - } - - mcbsp[id].free = 1; - spin_unlock(&mcbsp[id].lock); - - if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) { - /* Free IRQs */ - free_irq(mcbsp[id].rx_irq, (void *) (&mcbsp[id])); - free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id])); - } -} - -/* - * 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) -{ - u32 io_base; - u16 w; - - if (omap_mcbsp_check(id) < 0) - return; - - io_base = mcbsp[id].io_base; - - mcbsp[id].rx_word_length = ((OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7); - mcbsp[id].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); - -} - -void omap_mcbsp_stop(unsigned int id) -{ - u32 io_base; - u16 w; - - if (omap_mcbsp_check(id) < 0) - return; - - io_base = mcbsp[id].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)); -} - - -/* polled mcbsp i/o operations */ -int omap_mcbsp_pollwrite(unsigned int id, u16 buf) -{ - u32 base = mcbsp[id].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); - printk(KERN_ERR - " 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), - .dma_rx_sync = OMAP24XX_DMA_MCBSP1_RX, - .dma_tx_sync = OMAP24XX_DMA_MCBSP1_TX, - .rx_irq = INT_24XX_MCBSP1_IRQ_RX, - .tx_irq = INT_24XX_MCBSP1_IRQ_TX, - }, - [1] = { .virt_base = IO_ADDRESS(OMAP24XX_MCBSP2_BASE), - .dma_rx_sync = OMAP24XX_DMA_MCBSP2_RX, - .dma_tx_sync = OMAP24XX_DMA_MCBSP2_TX, - .rx_irq = INT_24XX_MCBSP2_IRQ_RX, - .tx_irq = INT_24XX_MCBSP2_IRQ_TX, - }, -}; -#endif - -static int __init omap_mcbsp_init(void) -{ - int mcbsp_count = 0, i; - static const struct omap_mcbsp_info *mcbsp_info; - - printk("Initializing OMAP McBSP system\n"); - -#ifdef CONFIG_ARCH_OMAP1 - mcbsp_dsp_ck = clk_get(0, "dsp_ck"); - if (IS_ERR(mcbsp_dsp_ck)) { - printk(KERN_ERR "mcbsp: could not acquire dsp_ck handle.\n"); - 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"); - 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_pollread); -EXPORT_SYMBOL(omap_mcbsp_pollwrite); -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); |