diff options
| -rw-r--r-- | arch/arm/include/asm/arch-mx28/dma.h | 170 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-mx28/imx-regs.h | 1 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-mx28/regs-apbh.h | 466 | ||||
| -rw-r--r-- | drivers/dma/Makefile | 1 | ||||
| -rw-r--r-- | drivers/dma/apbh_dma.c | 691 |
5 files changed, 1329 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-mx28/dma.h b/arch/arm/include/asm/arch-mx28/dma.h new file mode 100644 index 0000000000..7061e7c2fe --- /dev/null +++ b/arch/arm/include/asm/arch-mx28/dma.h @@ -0,0 +1,170 @@ +/* + * 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__ */ diff --git a/arch/arm/include/asm/arch-mx28/imx-regs.h b/arch/arm/include/asm/arch-mx28/imx-regs.h index 32bfd7e4dd..9561b5e485 100644 --- a/arch/arm/include/asm/arch-mx28/imx-regs.h +++ b/arch/arm/include/asm/arch-mx28/imx-regs.h @@ -23,6 +23,7 @@ #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> diff --git a/arch/arm/include/asm/arch-mx28/regs-apbh.h b/arch/arm/include/asm/arch-mx28/regs-apbh.h new file mode 100644 index 0000000000..a7fa1ec1ca --- /dev/null +++ b/arch/arm/include/asm/arch-mx28/regs-apbh.h @@ -0,0 +1,466 @@ +/* + * 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__ */ diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index 3d9c9f11a7..5d864b56ef 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -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 diff --git a/drivers/dma/apbh_dma.c b/drivers/dma/apbh_dma.c new file mode 100644 index 0000000000..69a10428ef --- /dev/null +++ b/drivers/dma/apbh_dma.c @@ -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; +} |