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iMX28: Add APBH DMA driver

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Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
master
Marek Vasut 13 years ago committed by Stefano Babic
parent ec33de3d12
commit 31650d64a8
5 changed files with 1329 additions and 0 deletions
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  1. 170
      arch/arm/include/asm/arch-mx28/dma.h
  2. 1
      arch/arm/include/asm/arch-mx28/imx-regs.h
  3. 466
      arch/arm/include/asm/arch-mx28/regs-apbh.h
  4. 1
      drivers/dma/Makefile
  5. 691
      drivers/dma/apbh_dma.c

170
arch/arm/include/asm/arch-mx28/dma.h
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/*
* Freescale i.MX28 APBH DMA
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
*
* Based on code from LTIB:
* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __DMA_H__
#define __DMA_H__
#include <linux/list.h>
#ifndef CONFIG_ARCH_DMA_PIO_WORDS
#define DMA_PIO_WORDS 15
#else
#define DMA_PIO_WORDS CONFIG_ARCH_DMA_PIO_WORDS
#endif
#define MXS_DMA_ALIGNMENT 32
/*
* MXS DMA channels
*/
enum {
MXS_DMA_CHANNEL_AHB_APBH_SSP0 = 0,
MXS_DMA_CHANNEL_AHB_APBH_SSP1,
MXS_DMA_CHANNEL_AHB_APBH_SSP2,
MXS_DMA_CHANNEL_AHB_APBH_SSP3,
MXS_DMA_CHANNEL_AHB_APBH_GPMI0,
MXS_DMA_CHANNEL_AHB_APBH_GPMI1,
MXS_DMA_CHANNEL_AHB_APBH_GPMI2,
MXS_DMA_CHANNEL_AHB_APBH_GPMI3,
MXS_DMA_CHANNEL_AHB_APBH_GPMI4,
MXS_DMA_CHANNEL_AHB_APBH_GPMI5,
MXS_DMA_CHANNEL_AHB_APBH_GPMI6,
MXS_DMA_CHANNEL_AHB_APBH_GPMI7,
MXS_DMA_CHANNEL_AHB_APBH_SSP,
MXS_MAX_DMA_CHANNELS,
};
/*
* MXS DMA hardware command.
*
* This structure describes the in-memory layout of an entire DMA command,
* including space for the maximum number of PIO accesses. See the appropriate
* reference manual for a detailed description of what these fields mean to the
* DMA hardware.
*/
#define MXS_DMA_DESC_COMMAND_MASK 0x3
#define MXS_DMA_DESC_COMMAND_OFFSET 0
#define MXS_DMA_DESC_COMMAND_NO_DMAXFER 0x0
#define MXS_DMA_DESC_COMMAND_DMA_WRITE 0x1
#define MXS_DMA_DESC_COMMAND_DMA_READ 0x2
#define MXS_DMA_DESC_COMMAND_DMA_SENSE 0x3
#define MXS_DMA_DESC_CHAIN (1 << 2)
#define MXS_DMA_DESC_IRQ (1 << 3)
#define MXS_DMA_DESC_NAND_LOCK (1 << 4)
#define MXS_DMA_DESC_NAND_WAIT_4_READY (1 << 5)
#define MXS_DMA_DESC_DEC_SEM (1 << 6)
#define MXS_DMA_DESC_WAIT4END (1 << 7)
#define MXS_DMA_DESC_HALT_ON_TERMINATE (1 << 8)
#define MXS_DMA_DESC_TERMINATE_FLUSH (1 << 9)
#define MXS_DMA_DESC_PIO_WORDS_MASK (0xf << 12)
#define MXS_DMA_DESC_PIO_WORDS_OFFSET 12
#define MXS_DMA_DESC_BYTES_MASK (0xffff << 16)
#define MXS_DMA_DESC_BYTES_OFFSET 16
struct mxs_dma_cmd {
unsigned long next;
unsigned long data;
union {
dma_addr_t address;
unsigned long alternate;
};
unsigned long pio_words[DMA_PIO_WORDS];
};
/*
* MXS DMA command descriptor.
*
* This structure incorporates an MXS DMA hardware command structure, along
* with metadata.
*/
#define MXS_DMA_DESC_FIRST (1 << 0)
#define MXS_DMA_DESC_LAST (1 << 1)
#define MXS_DMA_DESC_READY (1 << 31)
struct mxs_dma_desc {
struct mxs_dma_cmd cmd;
unsigned int flags;
dma_addr_t address;
void *buffer;
struct list_head node;
};
/**
* MXS DMA channel
*
* This structure represents a single DMA channel. The MXS platform code
* maintains an array of these structures to represent every DMA channel in the
* system (see mxs_dma_channels).
*/
#define MXS_DMA_FLAGS_IDLE 0
#define MXS_DMA_FLAGS_BUSY (1 << 0)
#define MXS_DMA_FLAGS_FREE 0
#define MXS_DMA_FLAGS_ALLOCATED (1 << 16)
#define MXS_DMA_FLAGS_VALID (1 << 31)
struct mxs_dma_chan {
const char *name;
unsigned long dev;
struct mxs_dma_device *dma;
unsigned int flags;
unsigned int active_num;
unsigned int pending_num;
struct list_head active;
struct list_head done;
};
/* Hardware management ops */
int mxs_dma_enable(int channel);
int mxs_dma_disable(int channel);
int mxs_dma_reset(int channel);
int mxs_dma_freeze(int channel);
int mxs_dma_unfreeze(int channel);
int mxs_dma_read_semaphore(int channel);
int mxs_dma_enable_irq(int channel, int enable);
int mxs_dma_irq_is_pending(int channel);
int mxs_dma_ack_irq(int channel);
/* Channel management ops */
int mxs_dma_request(int channel);
int mxs_dma_release(int channel);
/* Descriptor management ops */
struct mxs_dma_desc *mxs_dma_desc_alloc(void);
void mxs_dma_desc_free(struct mxs_dma_desc *);
unsigned int mxs_dma_cmd_address(struct mxs_dma_desc *desc);
int mxs_dma_desc_pending(struct mxs_dma_desc *pdesc);
int mxs_dma_desc_append(int channel, struct mxs_dma_desc *pdesc);
int mxs_dma_get_finished(int channel, struct list_head *head);
int mxs_dma_finish(int channel, struct list_head *head);
int mxs_dma_wait_complete(uint32_t timeout, unsigned int chan);
int mxs_dma_go(int chan);
int mxs_dma_init(void);
#endif /* __DMA_H__ */

1
arch/arm/include/asm/arch-mx28/imx-regs.h
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#ifndef __IMX_REGS_H__
#define __IMX_REGS_H__
#include <asm/arch/regs-apbh.h>
#include <asm/arch/regs-base.h>
#include <asm/arch/regs-bch.h>
#include <asm/arch/regs-clkctrl.h>

466
arch/arm/include/asm/arch-mx28/regs-apbh.h
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/*
* Freescale i.MX28 APBH Register Definitions
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
*
* Based on code from LTIB:
* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __REGS_APBH_H__
#define __REGS_APBH_H__
#include <asm/arch/regs-common.h>
#ifndef __ASSEMBLY__
struct mx28_apbh_regs {
mx28_reg(hw_apbh_ctrl0)
mx28_reg(hw_apbh_ctrl1)
mx28_reg(hw_apbh_ctrl2)
mx28_reg(hw_apbh_channel_ctrl)
mx28_reg(hw_apbh_devsel)
mx28_reg(hw_apbh_dma_burst_size)
mx28_reg(hw_apbh_debug)
uint32_t reserved[36];
union {
struct {
mx28_reg(hw_apbh_ch_curcmdar)
mx28_reg(hw_apbh_ch_nxtcmdar)
mx28_reg(hw_apbh_ch_cmd)
mx28_reg(hw_apbh_ch_bar)
mx28_reg(hw_apbh_ch_sema)
mx28_reg(hw_apbh_ch_debug1)
mx28_reg(hw_apbh_ch_debug2)
} ch[16];
struct {
mx28_reg(hw_apbh_ch0_curcmdar)
mx28_reg(hw_apbh_ch0_nxtcmdar)
mx28_reg(hw_apbh_ch0_cmd)
mx28_reg(hw_apbh_ch0_bar)
mx28_reg(hw_apbh_ch0_sema)
mx28_reg(hw_apbh_ch0_debug1)
mx28_reg(hw_apbh_ch0_debug2)
mx28_reg(hw_apbh_ch1_curcmdar)
mx28_reg(hw_apbh_ch1_nxtcmdar)
mx28_reg(hw_apbh_ch1_cmd)
mx28_reg(hw_apbh_ch1_bar)
mx28_reg(hw_apbh_ch1_sema)
mx28_reg(hw_apbh_ch1_debug1)
mx28_reg(hw_apbh_ch1_debug2)
mx28_reg(hw_apbh_ch2_curcmdar)
mx28_reg(hw_apbh_ch2_nxtcmdar)
mx28_reg(hw_apbh_ch2_cmd)
mx28_reg(hw_apbh_ch2_bar)
mx28_reg(hw_apbh_ch2_sema)
mx28_reg(hw_apbh_ch2_debug1)
mx28_reg(hw_apbh_ch2_debug2)
mx28_reg(hw_apbh_ch3_curcmdar)
mx28_reg(hw_apbh_ch3_nxtcmdar)
mx28_reg(hw_apbh_ch3_cmd)
mx28_reg(hw_apbh_ch3_bar)
mx28_reg(hw_apbh_ch3_sema)
mx28_reg(hw_apbh_ch3_debug1)
mx28_reg(hw_apbh_ch3_debug2)
mx28_reg(hw_apbh_ch4_curcmdar)
mx28_reg(hw_apbh_ch4_nxtcmdar)
mx28_reg(hw_apbh_ch4_cmd)
mx28_reg(hw_apbh_ch4_bar)
mx28_reg(hw_apbh_ch4_sema)
mx28_reg(hw_apbh_ch4_debug1)
mx28_reg(hw_apbh_ch4_debug2)
mx28_reg(hw_apbh_ch5_curcmdar)
mx28_reg(hw_apbh_ch5_nxtcmdar)
mx28_reg(hw_apbh_ch5_cmd)
mx28_reg(hw_apbh_ch5_bar)
mx28_reg(hw_apbh_ch5_sema)
mx28_reg(hw_apbh_ch5_debug1)
mx28_reg(hw_apbh_ch5_debug2)
mx28_reg(hw_apbh_ch6_curcmdar)
mx28_reg(hw_apbh_ch6_nxtcmdar)
mx28_reg(hw_apbh_ch6_cmd)
mx28_reg(hw_apbh_ch6_bar)
mx28_reg(hw_apbh_ch6_sema)
mx28_reg(hw_apbh_ch6_debug1)
mx28_reg(hw_apbh_ch6_debug2)
mx28_reg(hw_apbh_ch7_curcmdar)
mx28_reg(hw_apbh_ch7_nxtcmdar)
mx28_reg(hw_apbh_ch7_cmd)
mx28_reg(hw_apbh_ch7_bar)
mx28_reg(hw_apbh_ch7_sema)
mx28_reg(hw_apbh_ch7_debug1)
mx28_reg(hw_apbh_ch7_debug2)
mx28_reg(hw_apbh_ch8_curcmdar)
mx28_reg(hw_apbh_ch8_nxtcmdar)
mx28_reg(hw_apbh_ch8_cmd)
mx28_reg(hw_apbh_ch8_bar)
mx28_reg(hw_apbh_ch8_sema)
mx28_reg(hw_apbh_ch8_debug1)
mx28_reg(hw_apbh_ch8_debug2)
mx28_reg(hw_apbh_ch9_curcmdar)
mx28_reg(hw_apbh_ch9_nxtcmdar)
mx28_reg(hw_apbh_ch9_cmd)
mx28_reg(hw_apbh_ch9_bar)
mx28_reg(hw_apbh_ch9_sema)
mx28_reg(hw_apbh_ch9_debug1)
mx28_reg(hw_apbh_ch9_debug2)
mx28_reg(hw_apbh_ch10_curcmdar)
mx28_reg(hw_apbh_ch10_nxtcmdar)
mx28_reg(hw_apbh_ch10_cmd)
mx28_reg(hw_apbh_ch10_bar)
mx28_reg(hw_apbh_ch10_sema)
mx28_reg(hw_apbh_ch10_debug1)
mx28_reg(hw_apbh_ch10_debug2)
mx28_reg(hw_apbh_ch11_curcmdar)
mx28_reg(hw_apbh_ch11_nxtcmdar)
mx28_reg(hw_apbh_ch11_cmd)
mx28_reg(hw_apbh_ch11_bar)
mx28_reg(hw_apbh_ch11_sema)
mx28_reg(hw_apbh_ch11_debug1)
mx28_reg(hw_apbh_ch11_debug2)
mx28_reg(hw_apbh_ch12_curcmdar)
mx28_reg(hw_apbh_ch12_nxtcmdar)
mx28_reg(hw_apbh_ch12_cmd)
mx28_reg(hw_apbh_ch12_bar)
mx28_reg(hw_apbh_ch12_sema)
mx28_reg(hw_apbh_ch12_debug1)
mx28_reg(hw_apbh_ch12_debug2)
mx28_reg(hw_apbh_ch13_curcmdar)
mx28_reg(hw_apbh_ch13_nxtcmdar)
mx28_reg(hw_apbh_ch13_cmd)
mx28_reg(hw_apbh_ch13_bar)
mx28_reg(hw_apbh_ch13_sema)
mx28_reg(hw_apbh_ch13_debug1)
mx28_reg(hw_apbh_ch13_debug2)
mx28_reg(hw_apbh_ch14_curcmdar)
mx28_reg(hw_apbh_ch14_nxtcmdar)
mx28_reg(hw_apbh_ch14_cmd)
mx28_reg(hw_apbh_ch14_bar)
mx28_reg(hw_apbh_ch14_sema)
mx28_reg(hw_apbh_ch14_debug1)
mx28_reg(hw_apbh_ch14_debug2)
mx28_reg(hw_apbh_ch15_curcmdar)
mx28_reg(hw_apbh_ch15_nxtcmdar)
mx28_reg(hw_apbh_ch15_cmd)
mx28_reg(hw_apbh_ch15_bar)
mx28_reg(hw_apbh_ch15_sema)
mx28_reg(hw_apbh_ch15_debug1)
mx28_reg(hw_apbh_ch15_debug2)
};
};
mx28_reg(hw_apbh_version)
};
#endif
#define APBH_CTRL0_SFTRST (1 << 31)
#define APBH_CTRL0_CLKGATE (1 << 30)
#define APBH_CTRL0_AHB_BURST8_EN (1 << 29)
#define APBH_CTRL0_APB_BURST_EN (1 << 28)
#define APBH_CTRL0_RSVD0_MASK (0xfff << 16)
#define APBH_CTRL0_RSVD0_OFFSET 16
#define APBH_CTRL0_CLKGATE_CHANNEL_MASK 0xffff
#define APBH_CTRL0_CLKGATE_CHANNEL_OFFSET 0
#define APBH_CTRL0_CLKGATE_CHANNEL_SSP0 0x0001
#define APBH_CTRL0_CLKGATE_CHANNEL_SSP1 0x0002
#define APBH_CTRL0_CLKGATE_CHANNEL_SSP2 0x0004
#define APBH_CTRL0_CLKGATE_CHANNEL_SSP3 0x0008
#define APBH_CTRL0_CLKGATE_CHANNEL_NAND0 0x0010
#define APBH_CTRL0_CLKGATE_CHANNEL_NAND1 0x0020
#define APBH_CTRL0_CLKGATE_CHANNEL_NAND2 0x0040
#define APBH_CTRL0_CLKGATE_CHANNEL_NAND3 0x0080
#define APBH_CTRL0_CLKGATE_CHANNEL_NAND4 0x0100
#define APBH_CTRL0_CLKGATE_CHANNEL_NAND5 0x0200
#define APBH_CTRL0_CLKGATE_CHANNEL_NAND6 0x0400
#define APBH_CTRL0_CLKGATE_CHANNEL_NAND7 0x0800
#define APBH_CTRL0_CLKGATE_CHANNEL_HSADC 0x1000
#define APBH_CTRL0_CLKGATE_CHANNEL_LCDIF 0x2000
#define APBH_CTRL1_CH15_CMDCMPLT_IRQ_EN (1 << 31)
#define APBH_CTRL1_CH14_CMDCMPLT_IRQ_EN (1 << 30)
#define APBH_CTRL1_CH13_CMDCMPLT_IRQ_EN (1 << 29)
#define APBH_CTRL1_CH12_CMDCMPLT_IRQ_EN (1 << 28)
#define APBH_CTRL1_CH11_CMDCMPLT_IRQ_EN (1 << 27)
#define APBH_CTRL1_CH10_CMDCMPLT_IRQ_EN (1 << 26)
#define APBH_CTRL1_CH9_CMDCMPLT_IRQ_EN (1 << 25)
#define APBH_CTRL1_CH8_CMDCMPLT_IRQ_EN (1 << 24)
#define APBH_CTRL1_CH7_CMDCMPLT_IRQ_EN (1 << 23)
#define APBH_CTRL1_CH6_CMDCMPLT_IRQ_EN (1 << 22)
#define APBH_CTRL1_CH5_CMDCMPLT_IRQ_EN (1 << 21)
#define APBH_CTRL1_CH4_CMDCMPLT_IRQ_EN (1 << 20)
#define APBH_CTRL1_CH3_CMDCMPLT_IRQ_EN (1 << 19)
#define APBH_CTRL1_CH2_CMDCMPLT_IRQ_EN (1 << 18)
#define APBH_CTRL1_CH1_CMDCMPLT_IRQ_EN (1 << 17)
#define APBH_CTRL1_CH0_CMDCMPLT_IRQ_EN (1 << 16)
#define APBH_CTRL1_CH_CMDCMPLT_IRQ_EN_OFFSET 16
#define APBH_CTRL1_CH_CMDCMPLT_IRQ_EN_MASK (0xffff << 16)
#define APBH_CTRL1_CH15_CMDCMPLT_IRQ (1 << 15)
#define APBH_CTRL1_CH14_CMDCMPLT_IRQ (1 << 14)
#define APBH_CTRL1_CH13_CMDCMPLT_IRQ (1 << 13)
#define APBH_CTRL1_CH12_CMDCMPLT_IRQ (1 << 12)
#define APBH_CTRL1_CH11_CMDCMPLT_IRQ (1 << 11)
#define APBH_CTRL1_CH10_CMDCMPLT_IRQ (1 << 10)
#define APBH_CTRL1_CH9_CMDCMPLT_IRQ (1 << 9)
#define APBH_CTRL1_CH8_CMDCMPLT_IRQ (1 << 8)
#define APBH_CTRL1_CH7_CMDCMPLT_IRQ (1 << 7)
#define APBH_CTRL1_CH6_CMDCMPLT_IRQ (1 << 6)
#define APBH_CTRL1_CH5_CMDCMPLT_IRQ (1 << 5)
#define APBH_CTRL1_CH4_CMDCMPLT_IRQ (1 << 4)
#define APBH_CTRL1_CH3_CMDCMPLT_IRQ (1 << 3)
#define APBH_CTRL1_CH2_CMDCMPLT_IRQ (1 << 2)
#define APBH_CTRL1_CH1_CMDCMPLT_IRQ (1 << 1)
#define APBH_CTRL1_CH0_CMDCMPLT_IRQ (1 << 0)
#define APBH_CTRL2_CH15_ERROR_STATUS (1 << 31)
#define APBH_CTRL2_CH14_ERROR_STATUS (1 << 30)
#define APBH_CTRL2_CH13_ERROR_STATUS (1 << 29)
#define APBH_CTRL2_CH12_ERROR_STATUS (1 << 28)
#define APBH_CTRL2_CH11_ERROR_STATUS (1 << 27)
#define APBH_CTRL2_CH10_ERROR_STATUS (1 << 26)
#define APBH_CTRL2_CH9_ERROR_STATUS (1 << 25)
#define APBH_CTRL2_CH8_ERROR_STATUS (1 << 24)
#define APBH_CTRL2_CH7_ERROR_STATUS (1 << 23)
#define APBH_CTRL2_CH6_ERROR_STATUS (1 << 22)
#define APBH_CTRL2_CH5_ERROR_STATUS (1 << 21)
#define APBH_CTRL2_CH4_ERROR_STATUS (1 << 20)
#define APBH_CTRL2_CH3_ERROR_STATUS (1 << 19)
#define APBH_CTRL2_CH2_ERROR_STATUS (1 << 18)
#define APBH_CTRL2_CH1_ERROR_STATUS (1 << 17)
#define APBH_CTRL2_CH0_ERROR_STATUS (1 << 16)
#define APBH_CTRL2_CH15_ERROR_IRQ (1 << 15)
#define APBH_CTRL2_CH14_ERROR_IRQ (1 << 14)
#define APBH_CTRL2_CH13_ERROR_IRQ (1 << 13)
#define APBH_CTRL2_CH12_ERROR_IRQ (1 << 12)
#define APBH_CTRL2_CH11_ERROR_IRQ (1 << 11)
#define APBH_CTRL2_CH10_ERROR_IRQ (1 << 10)
#define APBH_CTRL2_CH9_ERROR_IRQ (1 << 9)
#define APBH_CTRL2_CH8_ERROR_IRQ (1 << 8)
#define APBH_CTRL2_CH7_ERROR_IRQ (1 << 7)
#define APBH_CTRL2_CH6_ERROR_IRQ (1 << 6)
#define APBH_CTRL2_CH5_ERROR_IRQ (1 << 5)
#define APBH_CTRL2_CH4_ERROR_IRQ (1 << 4)
#define APBH_CTRL2_CH3_ERROR_IRQ (1 << 3)
#define APBH_CTRL2_CH2_ERROR_IRQ (1 << 2)
#define APBH_CTRL2_CH1_ERROR_IRQ (1 << 1)
#define APBH_CTRL2_CH0_ERROR_IRQ (1 << 0)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_MASK (0xffff << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_OFFSET 16
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_SSP0 (0x0001 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_SSP1 (0x0002 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_SSP2 (0x0004 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_SSP3 (0x0008 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_NAND0 (0x0010 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_NAND1 (0x0020 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_NAND2 (0x0040 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_NAND3 (0x0080 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_NAND4 (0x0100 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_NAND5 (0x0200 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_NAND6 (0x0400 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_NAND7 (0x0800 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_HSADC (0x1000 << 16)
#define APBH_CHANNEL_CTRL_RESET_CHANNEL_LCDIF (0x2000 << 16)
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_MASK 0xffff
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_OFFSET 0
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_SSP0 0x0001
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_SSP1 0x0002
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_SSP2 0x0004
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_SSP3 0x0008
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_NAND0 0x0010
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_NAND1 0x0020
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_NAND2 0x0040
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_NAND3 0x0080
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_NAND4 0x0100
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_NAND5 0x0200
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_NAND6 0x0400
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_NAND7 0x0800
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_HSADC 0x1000
#define APBH_CHANNEL_CTRL_FREEZE_CHANNEL_LCDIF 0x2000
#define APBH_DEVSEL_CH15_MASK (0x3 << 30)
#define APBH_DEVSEL_CH15_OFFSET 30
#define APBH_DEVSEL_CH14_MASK (0x3 << 28)
#define APBH_DEVSEL_CH14_OFFSET 28
#define APBH_DEVSEL_CH13_MASK (0x3 << 26)
#define APBH_DEVSEL_CH13_OFFSET 26
#define APBH_DEVSEL_CH12_MASK (0x3 << 24)
#define APBH_DEVSEL_CH12_OFFSET 24
#define APBH_DEVSEL_CH11_MASK (0x3 << 22)
#define APBH_DEVSEL_CH11_OFFSET 22
#define APBH_DEVSEL_CH10_MASK (0x3 << 20)
#define APBH_DEVSEL_CH10_OFFSET 20
#define APBH_DEVSEL_CH9_MASK (0x3 << 18)
#define APBH_DEVSEL_CH9_OFFSET 18
#define APBH_DEVSEL_CH8_MASK (0x3 << 16)
#define APBH_DEVSEL_CH8_OFFSET 16
#define APBH_DEVSEL_CH7_MASK (0x3 << 14)
#define APBH_DEVSEL_CH7_OFFSET 14
#define APBH_DEVSEL_CH6_MASK (0x3 << 12)
#define APBH_DEVSEL_CH6_OFFSET 12
#define APBH_DEVSEL_CH5_MASK (0x3 << 10)
#define APBH_DEVSEL_CH5_OFFSET 10
#define APBH_DEVSEL_CH4_MASK (0x3 << 8)
#define APBH_DEVSEL_CH4_OFFSET 8
#define APBH_DEVSEL_CH3_MASK (0x3 << 6)
#define APBH_DEVSEL_CH3_OFFSET 6
#define APBH_DEVSEL_CH2_MASK (0x3 << 4)
#define APBH_DEVSEL_CH2_OFFSET 4
#define APBH_DEVSEL_CH1_MASK (0x3 << 2)
#define APBH_DEVSEL_CH1_OFFSET 2
#define APBH_DEVSEL_CH0_MASK (0x3 << 0)
#define APBH_DEVSEL_CH0_OFFSET 0
#define APBH_DMA_BURST_SIZE_CH15_MASK (0x3 << 30)
#define APBH_DMA_BURST_SIZE_CH15_OFFSET 30
#define APBH_DMA_BURST_SIZE_CH14_MASK (0x3 << 28)
#define APBH_DMA_BURST_SIZE_CH14_OFFSET 28
#define APBH_DMA_BURST_SIZE_CH13_MASK (0x3 << 26)
#define APBH_DMA_BURST_SIZE_CH13_OFFSET 26
#define APBH_DMA_BURST_SIZE_CH12_MASK (0x3 << 24)
#define APBH_DMA_BURST_SIZE_CH12_OFFSET 24
#define APBH_DMA_BURST_SIZE_CH11_MASK (0x3 << 22)
#define APBH_DMA_BURST_SIZE_CH11_OFFSET 22
#define APBH_DMA_BURST_SIZE_CH10_MASK (0x3 << 20)
#define APBH_DMA_BURST_SIZE_CH10_OFFSET 20
#define APBH_DMA_BURST_SIZE_CH9_MASK (0x3 << 18)
#define APBH_DMA_BURST_SIZE_CH9_OFFSET 18
#define APBH_DMA_BURST_SIZE_CH8_MASK (0x3 << 16)
#define APBH_DMA_BURST_SIZE_CH8_OFFSET 16
#define APBH_DMA_BURST_SIZE_CH8_BURST0 (0x0 << 16)
#define APBH_DMA_BURST_SIZE_CH8_BURST4 (0x1 << 16)
#define APBH_DMA_BURST_SIZE_CH8_BURST8 (0x2 << 16)
#define APBH_DMA_BURST_SIZE_CH7_MASK (0x3 << 14)
#define APBH_DMA_BURST_SIZE_CH7_OFFSET 14
#define APBH_DMA_BURST_SIZE_CH6_MASK (0x3 << 12)
#define APBH_DMA_BURST_SIZE_CH6_OFFSET 12
#define APBH_DMA_BURST_SIZE_CH5_MASK (0x3 << 10)
#define APBH_DMA_BURST_SIZE_CH5_OFFSET 10
#define APBH_DMA_BURST_SIZE_CH4_MASK (0x3 << 8)
#define APBH_DMA_BURST_SIZE_CH4_OFFSET 8
#define APBH_DMA_BURST_SIZE_CH3_MASK (0x3 << 6)
#define APBH_DMA_BURST_SIZE_CH3_OFFSET 6
#define APBH_DMA_BURST_SIZE_CH3_BURST0 (0x0 << 6)
#define APBH_DMA_BURST_SIZE_CH3_BURST4 (0x1 << 6)
#define APBH_DMA_BURST_SIZE_CH3_BURST8 (0x2 << 6)
#define APBH_DMA_BURST_SIZE_CH2_MASK (0x3 << 4)
#define APBH_DMA_BURST_SIZE_CH2_OFFSET 4
#define APBH_DMA_BURST_SIZE_CH2_BURST0 (0x0 << 4)
#define APBH_DMA_BURST_SIZE_CH2_BURST4 (0x1 << 4)
#define APBH_DMA_BURST_SIZE_CH2_BURST8 (0x2 << 4)
#define APBH_DMA_BURST_SIZE_CH1_MASK (0x3 << 2)
#define APBH_DMA_BURST_SIZE_CH1_OFFSET 2
#define APBH_DMA_BURST_SIZE_CH1_BURST0 (0x0 << 2)
#define APBH_DMA_BURST_SIZE_CH1_BURST4 (0x1 << 2)
#define APBH_DMA_BURST_SIZE_CH1_BURST8 (0x2 << 2)
#define APBH_DMA_BURST_SIZE_CH0_MASK 0x3
#define APBH_DMA_BURST_SIZE_CH0_OFFSET 0
#define APBH_DMA_BURST_SIZE_CH0_BURST0 0x0
#define APBH_DMA_BURST_SIZE_CH0_BURST4 0x1
#define APBH_DMA_BURST_SIZE_CH0_BURST8 0x2
#define APBH_DEBUG_GPMI_ONE_FIFO (1 << 0)
#define APBH_CHn_CURCMDAR_CMD_ADDR_MASK 0xffffffff
#define APBH_CHn_CURCMDAR_CMD_ADDR_OFFSET 0
#define APBH_CHn_NXTCMDAR_CMD_ADDR_MASK 0xffffffff
#define APBH_CHn_NXTCMDAR_CMD_ADDR_OFFSET 0
#define APBH_CHn_CMD_XFER_COUNT_MASK (0xffff << 16)
#define APBH_CHn_CMD_XFER_COUNT_OFFSET 16
#define APBH_CHn_CMD_CMDWORDS_MASK (0xf << 12)
#define APBH_CHn_CMD_CMDWORDS_OFFSET 12
#define APBH_CHn_CMD_HALTONTERMINATE (1 << 8)
#define APBH_CHn_CMD_WAIT4ENDCMD (1 << 7)
#define APBH_CHn_CMD_SEMAPHORE (1 << 6)
#define APBH_CHn_CMD_NANDWAIT4READY (1 << 5)
#define APBH_CHn_CMD_NANDLOCK (1 << 4)
#define APBH_CHn_CMD_IRQONCMPLT (1 << 3)
#define APBH_CHn_CMD_CHAIN (1 << 2)
#define APBH_CHn_CMD_COMMAND_MASK 0x3
#define APBH_CHn_CMD_COMMAND_OFFSET 0
#define APBH_CHn_CMD_COMMAND_NO_DMA_XFER 0x0
#define APBH_CHn_CMD_COMMAND_DMA_WRITE 0x1
#define APBH_CHn_CMD_COMMAND_DMA_READ 0x2
#define APBH_CHn_CMD_COMMAND_DMA_SENSE 0x3
#define APBH_CHn_BAR_ADDRESS_MASK 0xffffffff
#define APBH_CHn_BAR_ADDRESS_OFFSET 0
#define APBH_CHn_SEMA_RSVD2_MASK (0xff << 24)
#define APBH_CHn_SEMA_RSVD2_OFFSET 24
#define APBH_CHn_SEMA_PHORE_MASK (0xff << 16)
#define APBH_CHn_SEMA_PHORE_OFFSET 16
#define APBH_CHn_SEMA_RSVD1_MASK (0xff << 8)
#define APBH_CHn_SEMA_RSVD1_OFFSET 8
#define APBH_CHn_SEMA_INCREMENT_SEMA_MASK (0xff << 0)
#define APBH_CHn_SEMA_INCREMENT_SEMA_OFFSET 0
#define APBH_CHn_DEBUG1_REQ (1 << 31)
#define APBH_CHn_DEBUG1_BURST (1 << 30)
#define APBH_CHn_DEBUG1_KICK (1 << 29)
#define APBH_CHn_DEBUG1_END (1 << 28)
#define APBH_CHn_DEBUG1_SENSE (1 << 27)
#define APBH_CHn_DEBUG1_READY (1 << 26)
#define APBH_CHn_DEBUG1_LOCK (1 << 25)
#define APBH_CHn_DEBUG1_NEXTCMDADDRVALID (1 << 24)
#define APBH_CHn_DEBUG1_RD_FIFO_EMPTY (1 << 23)
#define APBH_CHn_DEBUG1_RD_FIFO_FULL (1 << 22)
#define APBH_CHn_DEBUG1_WR_FIFO_EMPTY (1 << 21)
#define APBH_CHn_DEBUG1_WR_FIFO_FULL (1 << 20)
#define APBH_CHn_DEBUG1_RSVD1_MASK (0x7fff << 5)
#define APBH_CHn_DEBUG1_RSVD1_OFFSET 5
#define APBH_CHn_DEBUG1_STATEMACHINE_MASK 0x1f
#define APBH_CHn_DEBUG1_STATEMACHINE_OFFSET 0
#define APBH_CHn_DEBUG1_STATEMACHINE_IDLE 0x00
#define APBH_CHn_DEBUG1_STATEMACHINE_REQ_CMD1 0x01
#define APBH_CHn_DEBUG1_STATEMACHINE_REQ_CMD3 0x02
#define APBH_CHn_DEBUG1_STATEMACHINE_REQ_CMD2 0x03
#define APBH_CHn_DEBUG1_STATEMACHINE_XFER_DECODE 0x04
#define APBH_CHn_DEBUG1_STATEMACHINE_REQ_WAIT 0x05
#define APBH_CHn_DEBUG1_STATEMACHINE_REQ_CMD4 0x06
#define APBH_CHn_DEBUG1_STATEMACHINE_PIO_REQ 0x07
#define APBH_CHn_DEBUG1_STATEMACHINE_READ_FLUSH 0x08
#define APBH_CHn_DEBUG1_STATEMACHINE_READ_WAIT 0x09
#define APBH_CHn_DEBUG1_STATEMACHINE_WRITE 0x0c
#define APBH_CHn_DEBUG1_STATEMACHINE_READ_REQ 0x0d
#define APBH_CHn_DEBUG1_STATEMACHINE_CHECK_CHAIN 0x0e
#define APBH_CHn_DEBUG1_STATEMACHINE_XFER_COMPLETE 0x0f
#define APBH_CHn_DEBUG1_STATEMACHINE_TERMINATE 0x14
#define APBH_CHn_DEBUG1_STATEMACHINE_WAIT_END 0x15
#define APBH_CHn_DEBUG1_STATEMACHINE_WRITE_WAIT 0x1c
#define APBH_CHn_DEBUG1_STATEMACHINE_HALT_AFTER_TERM 0x1d
#define APBH_CHn_DEBUG1_STATEMACHINE_CHECK_WAIT 0x1e
#define APBH_CHn_DEBUG1_STATEMACHINE_WAIT_READY 0x1f
#define APBH_CHn_DEBUG2_APB_BYTES_MASK (0xffff << 16)
#define APBH_CHn_DEBUG2_APB_BYTES_OFFSET 16
#define APBH_CHn_DEBUG2_AHB_BYTES_MASK 0xffff
#define APBH_CHn_DEBUG2_AHB_BYTES_OFFSET 0
#define APBH_VERSION_MAJOR_MASK (0xff << 24)
#define APBH_VERSION_MAJOR_OFFSET 24
#define APBH_VERSION_MINOR_MASK (0xff << 16)
#define APBH_VERSION_MINOR_OFFSET 16
#define APBH_VERSION_STEP_MASK 0xffff
#define APBH_VERSION_STEP_OFFSET 0
#endif /* __REGS_APBH_H__ */

1
drivers/dma/Makefile
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@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libdma.o
COBJS-$(CONFIG_FSLDMAFEC) += MCD_tasksInit.o MCD_dmaApi.o MCD_tasks.o
COBJS-$(CONFIG_APBH_DMA) += apbh_dma.o
COBJS-$(CONFIG_FSL_DMA) += fsl_dma.o
COBJS-$(CONFIG_OMAP3_DMA) += omap3_dma.o

691
drivers/dma/apbh_dma.c
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@ -0,0 +1,691 @@
/*
* Freescale i.MX28 APBH DMA driver
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
*
* Based on code from LTIB:
* Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/list.h>
#include <common.h>
#include <malloc.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/dma.h>
static struct mxs_dma_chan mxs_dma_channels[MXS_MAX_DMA_CHANNELS];
/*
* Test is the DMA channel is valid channel
*/
int mxs_dma_validate_chan(int channel)
{
struct mxs_dma_chan *pchan;
if ((channel < 0) || (channel >= MXS_MAX_DMA_CHANNELS))
return -EINVAL;
pchan = mxs_dma_channels + channel;
if (!(pchan->flags & MXS_DMA_FLAGS_ALLOCATED))
return -EINVAL;
return 0;
}
/*
* Enable a DMA channel.
*
* If the given channel has any DMA descriptors on its active list, this
* function causes the DMA hardware to begin processing them.
*
* This function marks the DMA channel as "busy," whether or not there are any
* descriptors to process.
*/
int mxs_dma_enable(int channel)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
unsigned int sem;
struct mxs_dma_chan *pchan;
struct mxs_dma_desc *pdesc;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
pchan = mxs_dma_channels + channel;
if (pchan->pending_num == 0) {
pchan->flags |= MXS_DMA_FLAGS_BUSY;
return 0;
}
pdesc = list_first_entry(&pchan->active, struct mxs_dma_desc, node);
if (pdesc == NULL)
return -EFAULT;
if (pchan->flags & MXS_DMA_FLAGS_BUSY) {
if (!(pdesc->cmd.data & MXS_DMA_DESC_CHAIN))
return 0;
sem = mxs_dma_read_semaphore(channel);
if (sem == 0)
return 0;
if (sem == 1) {
pdesc = list_entry(pdesc->node.next,
struct mxs_dma_desc, node);
writel(mxs_dma_cmd_address(pdesc),
&apbh_regs->ch[channel].hw_apbh_ch_nxtcmdar);
}
writel(pchan->pending_num,
&apbh_regs->ch[channel].hw_apbh_ch_sema);
pchan->active_num += pchan->pending_num;
pchan->pending_num = 0;
} else {
pchan->active_num += pchan->pending_num;
pchan->pending_num = 0;
writel(mxs_dma_cmd_address(pdesc),
&apbh_regs->ch[channel].hw_apbh_ch_nxtcmdar);
writel(pchan->active_num,
&apbh_regs->ch[channel].hw_apbh_ch_sema);
writel(1 << (channel + APBH_CTRL0_CLKGATE_CHANNEL_OFFSET),
&apbh_regs->hw_apbh_ctrl0_clr);
}
pchan->flags |= MXS_DMA_FLAGS_BUSY;
return 0;
}
/*
* Disable a DMA channel.
*
* This function shuts down a DMA channel and marks it as "not busy." Any
* descriptors on the active list are immediately moved to the head of the
* "done" list, whether or not they have actually been processed by the
* hardware. The "ready" flags of these descriptors are NOT cleared, so they
* still appear to be active.
*
* This function immediately shuts down a DMA channel's hardware, aborting any
* I/O that may be in progress, potentially leaving I/O hardware in an undefined
* state. It is unwise to call this function if there is ANY chance the hardware
* is still processing a command.
*/
int mxs_dma_disable(int channel)
{
struct mxs_dma_chan *pchan;
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
pchan = mxs_dma_channels + channel;
if (!(pchan->flags & MXS_DMA_FLAGS_BUSY))
return -EINVAL;
writel(1 << (channel + APBH_CTRL0_CLKGATE_CHANNEL_OFFSET),
&apbh_regs->hw_apbh_ctrl0_set);
pchan->flags &= ~MXS_DMA_FLAGS_BUSY;
pchan->active_num = 0;
pchan->pending_num = 0;
list_splice_init(&pchan->active, &pchan->done);
return 0;
}
/*
* Resets the DMA channel hardware.
*/
int mxs_dma_reset(int channel)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
writel(1 << (channel + APBH_CHANNEL_CTRL_RESET_CHANNEL_OFFSET),
&apbh_regs->hw_apbh_channel_ctrl_set);
return 0;
}
/*
* Freeze a DMA channel.
*
* This function causes the channel to continuously fail arbitration for bus
* access, which halts all forward progress without losing any state. A call to
* mxs_dma_unfreeze() will cause the channel to continue its current operation
* with no ill effect.
*/
int mxs_dma_freeze(int channel)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
writel(1 << (channel + APBH_CHANNEL_CTRL_FREEZE_CHANNEL_OFFSET),
&apbh_regs->hw_apbh_channel_ctrl_set);
return 0;
}
/*
* Unfreeze a DMA channel.
*
* This function reverses the effect of mxs_dma_freeze(), enabling the DMA
* channel to continue from where it was frozen.
*/
int mxs_dma_unfreeze(int channel)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
writel(1 << (channel + APBH_CHANNEL_CTRL_FREEZE_CHANNEL_OFFSET),
&apbh_regs->hw_apbh_channel_ctrl_clr);
return 0;
}
/*
* Read a DMA channel's hardware semaphore.
*
* As used by the MXS platform's DMA software, the DMA channel's hardware
* semaphore reflects the number of DMA commands the hardware will process, but
* has not yet finished. This is a volatile value read directly from hardware,
* so it must be be viewed as immediately stale.
*
* If the channel is not marked busy, or has finished processing all its
* commands, this value should be zero.
*
* See mxs_dma_append() for details on how DMA command blocks must be configured
* to maintain the expected behavior of the semaphore's value.
*/
int mxs_dma_read_semaphore(int channel)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
uint32_t tmp;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
tmp = readl(&apbh_regs->ch[channel].hw_apbh_ch_sema);
tmp &= APBH_CHn_SEMA_PHORE_MASK;
tmp >>= APBH_CHn_SEMA_PHORE_OFFSET;
return tmp;
}
/*
* Enable or disable DMA interrupt.
*
* This function enables the given DMA channel to interrupt the CPU.
*/
int mxs_dma_enable_irq(int channel, int enable)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
if (enable)
writel(1 << (channel + APBH_CTRL1_CH_CMDCMPLT_IRQ_EN_OFFSET),
&apbh_regs->hw_apbh_ctrl1_set);
else
writel(1 << (channel + APBH_CTRL1_CH_CMDCMPLT_IRQ_EN_OFFSET),
&apbh_regs->hw_apbh_ctrl1_clr);
return 0;
}
/*
* Check if a DMA interrupt is pending.
*/
int mxs_dma_irq_is_pending(int channel)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
uint32_t tmp;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
tmp = readl(&apbh_regs->hw_apbh_ctrl1);
tmp |= readl(&apbh_regs->hw_apbh_ctrl2);
return (tmp >> channel) & 1;
}
/*
* Clear DMA interrupt.
*
* The software that is using the DMA channel must register to receive its
* interrupts and, when they arrive, must call this function to clear them.
*/
int mxs_dma_ack_irq(int channel)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
writel(1 << channel, &apbh_regs->hw_apbh_ctrl1_clr);
writel(1 << channel, &apbh_regs->hw_apbh_ctrl2_clr);
return 0;
}
/*
* Request to reserve a DMA channel
*/
int mxs_dma_request(int channel)
{
struct mxs_dma_chan *pchan;
if ((channel < 0) || (channel >= MXS_MAX_DMA_CHANNELS))
return -EINVAL;
pchan = mxs_dma_channels + channel;
if ((pchan->flags & MXS_DMA_FLAGS_VALID) != MXS_DMA_FLAGS_VALID)
return -ENODEV;
if (pchan->flags & MXS_DMA_FLAGS_ALLOCATED)
return -EBUSY;
pchan->flags |= MXS_DMA_FLAGS_ALLOCATED;
pchan->active_num = 0;
pchan->pending_num = 0;
INIT_LIST_HEAD(&pchan->active);
INIT_LIST_HEAD(&pchan->done);
return 0;
}
/*
* Release a DMA channel.
*
* This function releases a DMA channel from its current owner.
*
* The channel will NOT be released if it's marked "busy" (see
* mxs_dma_enable()).
*/
int mxs_dma_release(int channel)
{
struct mxs_dma_chan *pchan;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
pchan = mxs_dma_channels + channel;
if (pchan->flags & MXS_DMA_FLAGS_BUSY)
return -EBUSY;
pchan->dev = 0;
pchan->active_num = 0;
pchan->pending_num = 0;
pchan->flags &= ~MXS_DMA_FLAGS_ALLOCATED;
return 0;
}
/*
* Allocate DMA descriptor
*/
struct mxs_dma_desc *mxs_dma_desc_alloc(void)
{
struct mxs_dma_desc *pdesc;
pdesc = memalign(MXS_DMA_ALIGNMENT, sizeof(struct mxs_dma_desc));
if (pdesc == NULL)
return NULL;
memset(pdesc, 0, sizeof(*pdesc));
pdesc->address = (dma_addr_t)pdesc;
return pdesc;
};
/*
* Free DMA descriptor
*/
void mxs_dma_desc_free(struct mxs_dma_desc *pdesc)
{
if (pdesc == NULL)
return;
free(pdesc);
}
/*
* Return the address of the command within a descriptor.
*/
unsigned int mxs_dma_cmd_address(struct mxs_dma_desc *desc)
{
return desc->address + offsetof(struct mxs_dma_desc, cmd);
}
/*
* Check if descriptor is on a channel's active list.
*
* This function returns the state of a descriptor's "ready" flag. This flag is
* usually set only if the descriptor appears on a channel's active list. The
* descriptor may or may not have already been processed by the hardware.
*
* The "ready" flag is set when the descriptor is submitted to a channel by a
* call to mxs_dma_append() or mxs_dma_append_list(). The "ready" flag is
* cleared when a processed descriptor is moved off the active list by a call
* to mxs_dma_finish(). The "ready" flag is NOT cleared if the descriptor is
* aborted by a call to mxs_dma_disable().
*/
int mxs_dma_desc_pending(struct mxs_dma_desc *pdesc)
{
return pdesc->flags & MXS_DMA_DESC_READY;
}
/*
* Add a DMA descriptor to a channel.
*
* If the descriptor list for this channel is not empty, this function sets the
* CHAIN bit and the NEXTCMD_ADDR fields in the last descriptor's DMA command so
* it will chain to the new descriptor's command.
*
* Then, this function marks the new descriptor as "ready," adds it to the end
* of the active descriptor list, and increments the count of pending
* descriptors.
*
* The MXS platform DMA software imposes some rules on DMA commands to maintain
* important invariants. These rules are NOT checked, but they must be carefully
* applied by software that uses MXS DMA channels.
*
* Invariant:
* The DMA channel's hardware semaphore must reflect the number of DMA
* commands the hardware will process, but has not yet finished.
*
* Explanation:
* A DMA channel begins processing commands when its hardware semaphore is
* written with a value greater than zero, and it stops processing commands
* when the semaphore returns to zero.
*
* When a channel finishes a DMA command, it will decrement its semaphore if
* the DECREMENT_SEMAPHORE bit is set in that command's flags bits.
*
* In principle, it's not necessary for the DECREMENT_SEMAPHORE to be set,
* unless it suits the purposes of the software. For example, one could
* construct a series of five DMA commands, with the DECREMENT_SEMAPHORE
* bit set only in the last one. Then, setting the DMA channel's hardware
* semaphore to one would cause the entire series of five commands to be
* processed. However, this example would violate the invariant given above.
*
* Rule:
* ALL DMA commands MUST have the DECREMENT_SEMAPHORE bit set so that the DMA
* channel's hardware semaphore will be decremented EVERY time a command is
* processed.
*/
int mxs_dma_desc_append(int channel, struct mxs_dma_desc *pdesc)
{
struct mxs_dma_chan *pchan;
struct mxs_dma_desc *last;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
pchan = mxs_dma_channels + channel;
pdesc->cmd.next = mxs_dma_cmd_address(pdesc);
pdesc->flags |= MXS_DMA_DESC_FIRST | MXS_DMA_DESC_LAST;
if (!list_empty(&pchan->active)) {
last = list_entry(pchan->active.prev, struct mxs_dma_desc,
node);
pdesc->flags &= ~MXS_DMA_DESC_FIRST;
last->flags &= ~MXS_DMA_DESC_LAST;
last->cmd.next = mxs_dma_cmd_address(pdesc);
last->cmd.data |= MXS_DMA_DESC_CHAIN;
}
pdesc->flags |= MXS_DMA_DESC_READY;
if (pdesc->flags & MXS_DMA_DESC_FIRST)
pchan->pending_num++;
list_add_tail(&pdesc->node, &pchan->active);
return ret;
}
/*
* Retrieve processed DMA descriptors.
*
* This function moves all the descriptors from the DMA channel's "done" list to
* the head of the given list.
*/
int mxs_dma_get_finished(int channel, struct list_head *head)
{
struct mxs_dma_chan *pchan;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
if (head == NULL)
return 0;
pchan = mxs_dma_channels + channel;
list_splice(&pchan->done, head);
return 0;
}
/*
* Clean up processed DMA descriptors.
*
* This function removes processed DMA descriptors from the "active" list. Pass
* in a non-NULL list head to get the descriptors moved to your list. Pass NULL
* to get the descriptors moved to the channel's "done" list. Descriptors on
* the "done" list can be retrieved with mxs_dma_get_finished().
*
* This function marks the DMA channel as "not busy" if no unprocessed
* descriptors remain on the "active" list.
*/
int mxs_dma_finish(int channel, struct list_head *head)
{
int sem;
struct mxs_dma_chan *pchan;
struct list_head *p, *q;
struct mxs_dma_desc *pdesc;
int ret;
ret = mxs_dma_validate_chan(channel);
if (ret)
return ret;
pchan = mxs_dma_channels + channel;
sem = mxs_dma_read_semaphore(channel);
if (sem < 0)
return sem;
if (sem == pchan->active_num)
return 0;
list_for_each_safe(p, q, &pchan->active) {
if ((pchan->active_num) <= sem)
break;
pdesc = list_entry(p, struct mxs_dma_desc, node);
pdesc->flags &= ~MXS_DMA_DESC_READY;
if (head)
list_move_tail(p, head);
else
list_move_tail(p, &pchan->done);
if (pdesc->flags & MXS_DMA_DESC_LAST)
pchan->active_num--;
}
if (sem == 0)
pchan->flags &= ~MXS_DMA_FLAGS_BUSY;
return 0;
}
/*
* Wait for DMA channel to complete
*/
int mxs_dma_wait_complete(uint32_t timeout, unsigned int chan)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
int ret;
ret = mxs_dma_validate_chan(chan);
if (ret)
return ret;
if (mx28_wait_mask_set(&apbh_regs->hw_apbh_ctrl1_reg,
1 << chan, timeout)) {
ret = -ETIMEDOUT;
mxs_dma_reset(chan);
}
return 0;
}
/*
* Execute the DMA channel
*/
int mxs_dma_go(int chan)
{
uint32_t timeout = 10000;
int ret;
LIST_HEAD(tmp_desc_list);
mxs_dma_enable_irq(chan, 1);
mxs_dma_enable(chan);
/* Wait for DMA to finish. */
ret = mxs_dma_wait_complete(timeout, chan);
/* Clear out the descriptors we just ran. */
mxs_dma_finish(chan, &tmp_desc_list);
/* Shut the DMA channel down. */
mxs_dma_ack_irq(chan);
mxs_dma_reset(chan);
mxs_dma_enable_irq(chan, 0);
mxs_dma_disable(chan);
return ret;
}
/*
* Initialize the DMA hardware
*/
int mxs_dma_init(void)
{
struct mx28_apbh_regs *apbh_regs =
(struct mx28_apbh_regs *)MXS_APBH_BASE;
struct mxs_dma_chan *pchan;
int ret, channel;
mx28_reset_block(&apbh_regs->hw_apbh_ctrl0_reg);
#ifdef CONFIG_APBH_DMA_BURST8
writel(APBH_CTRL0_AHB_BURST8_EN,
&apbh_regs->hw_apbh_ctrl0_set);
#else
writel(APBH_CTRL0_AHB_BURST8_EN,
&apbh_regs->hw_apbh_ctrl0_clr);
#endif
#ifdef CONFIG_APBH_DMA_BURST
writel(APBH_CTRL0_APB_BURST_EN,
&apbh_regs->hw_apbh_ctrl0_set);
#else
writel(APBH_CTRL0_APB_BURST_EN,
&apbh_regs->hw_apbh_ctrl0_clr);
#endif
for (channel = 0; channel < MXS_MAX_DMA_CHANNELS; channel++) {
pchan = mxs_dma_channels + channel;
pchan->flags = MXS_DMA_FLAGS_VALID;
ret = mxs_dma_request(channel);
if (ret) {
printf("MXS DMA: Can't acquire DMA channel %i\n",
channel);
goto err;
}
mxs_dma_reset(channel);
mxs_dma_ack_irq(channel);
}
return 0;
err:
while (--channel >= 0)
mxs_dma_release(channel);
return ret;
}
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