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Date: Fri, 27 Feb 2015 11:59:41 +0530 From: Rameshwar Sahu <rsahu@....com> To: Ben Dooks <ben.dooks@...ethink.co.uk> Cc: Vinod Koul <vinod.koul@...el.com>, dan.j.williams@...el.com, dmaengine@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, ddutile@...hat.com, jcm@...hat.com, patches@....com, Loc Ho <lho@....com> Subject: Re: [PATCH v6 1/3] dmaengine: Add support for APM X-Gene SoC DMA engine driver Hi On Fri, Feb 27, 2015 at 9:39 AM, Rameshwar Sahu <rsahu@....com> wrote: > Hi, > > > On Thu, Feb 26, 2015 at 7:55 PM, Ben Dooks <ben.dooks@...ethink.co.uk> wrote: >> On 26/02/15 12:31, Rameshwar Sahu wrote: >>> Hi Vinod, >>> >>> >>> On Tue, Feb 24, 2015 at 6:23 PM, Rameshwar Prasad Sahu <rsahu@....com> wrote: >>>> This patch implements the APM X-Gene SoC DMA engine driver. The APM X-Gene >>>> SoC DMA engine consists of 4 DMA channels for performing DMA operations. >>>> These DMA operations include memory copy and scatter-gather memory copy >>>> offloading. >>>> >>>> Signed-off-by: Rameshwar Prasad Sahu <rsahu@....com> >>>> Signed-off-by: Loc Ho <lho@....com> >>>> --- >>>> drivers/dma/Kconfig | 8 + >>>> drivers/dma/Makefile | 1 + >>>> drivers/dma/xgene-dma.c | 1738 +++++++++++++++++++++++++++++++++++++++++++++++ >>>> 3 files changed, 1747 insertions(+) >>>> create mode 100755 drivers/dma/xgene-dma.c >>>> >>>> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig >>>> index a874b6e..0e05831 100644 >>>> --- a/drivers/dma/Kconfig >>>> +++ b/drivers/dma/Kconfig >>>> @@ -425,6 +425,14 @@ config IMG_MDC_DMA >>>> help >>>> Enable support for the IMG multi-threaded DMA controller (MDC). >>>> >>>> +config XGENE_DMA >>>> + tristate "APM X-Gene DMA support" >>>> + depends on ARCH_XGENE >>>> + select DMA_ENGINE >>>> + select ASYNC_TX_ENABLE_CHANNEL_SWITCH >>>> + help >>>> + Enable support for the APM X-Gene SoC DMA engine. >>>> + >>>> config DMA_ENGINE >>>> bool >>>> >>>> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile >>>> index f915f61..06c1576 100644 >>>> --- a/drivers/dma/Makefile >>>> +++ b/drivers/dma/Makefile >>>> @@ -51,3 +51,4 @@ obj-$(CONFIG_INTEL_MIC_X100_DMA) += mic_x100_dma.o >>>> obj-$(CONFIG_NBPFAXI_DMA) += nbpfaxi.o >>>> obj-$(CONFIG_DMA_SUN6I) += sun6i-dma.o >>>> obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o >>>> +obj-$(CONFIG_XGENE_DMA) += xgene-dma.o >>>> diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c >>>> new file mode 100755 >>>> index 0000000..e736c2e >>>> --- /dev/null >>>> +++ b/drivers/dma/xgene-dma.c >>>> @@ -0,0 +1,1738 @@ >>>> +/* >>>> + * Applied Micro X-Gene SoC DMA engine Driver >>>> + * >>>> + * Copyright (c) 2015, Applied Micro Circuits Corporation >>>> + * Authors: Rameshwar Prasad Sahu <rsahu@....com> >>>> + * Loc Ho <lho@....com> >>>> + * >>>> + * 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, see <http://www.gnu.org/licenses/>. >>>> + * >>>> + * NOTE: PM support is currently not available. >>>> + */ >>>> + >>>> +#include <linux/clk.h> >>>> +#include <linux/delay.h> >>>> +#include <linux/dma-mapping.h> >>>> +#include <linux/dmaengine.h> >>>> +#include <linux/dmapool.h> >>>> +#include <linux/interrupt.h> >>>> +#include <linux/io.h> >>>> +#include <linux/module.h> >>>> +#include <linux/of_device.h> >>>> + >>>> +#include "dmaengine.h" >>>> + >>>> +/* DMA ring csr registers and bit definations */ >>>> +#define DMA_RING_CONFIG 0x04 >>>> +#define DMA_RING_ENABLE BIT(31) >>>> +#define DMA_RING_ID 0x08 >>>> +#define DMA_RING_ID_SETUP(v) ((v) | BIT(31)) >>>> +#define DMA_RING_ID_BUF 0x0C >>>> +#define DMA_RING_ID_BUF_SETUP(v) (((v) << 9) | BIT(21)) >>>> +#define DMA_RING_THRESLD0_SET1 0x30 >>>> +#define DMA_RING_THRESLD0_SET1_VAL 0X64 >>>> +#define DMA_RING_THRESLD1_SET1 0x34 >>>> +#define DMA_RING_THRESLD1_SET1_VAL 0xC8 >>>> +#define DMA_RING_HYSTERESIS 0x68 >>>> +#define DMA_RING_HYSTERESIS_VAL 0xFFFFFFFF >>>> +#define DMA_RING_STATE 0x6C >>>> +#define DMA_RING_STATE_WR_BASE 0x70 >>>> +#define DMA_RING_NE_INT_MODE 0x017C >>>> +#define DMA_RING_NE_INT_MODE_SET(m, v) \ >>>> + ((m) = ((m) & ~BIT(31 - (v))) | BIT(31 - (v))) >>>> +#define DMA_RING_NE_INT_MODE_RESET(m, v) \ >>>> + ((m) &= (~BIT(31 - (v)))) >>>> +#define DMA_RING_CLKEN 0xC208 >>>> +#define DMA_RING_SRST 0xC200 >>>> +#define DMA_RING_MEM_RAM_SHUTDOWN 0xD070 >>>> +#define DMA_RING_BLK_MEM_RDY 0xD074 >>>> +#define DMA_RING_BLK_MEM_RDY_VAL 0xFFFFFFFF >>>> +#define DMA_RING_DESC_CNT(v) (((v) & 0x0001FFFE) >> 1) >>>> +#define DMA_RING_ID_GET(owner, num) (((owner) << 6) | (num)) >>>> +#define DMA_RING_DST_ID(v) ((1 << 10) | (v)) >>>> +#define DMA_RING_CMD_OFFSET 0x2C >>>> +#define DMA_RING_CMD_BASE_OFFSET(v) ((v) << 6) >>>> +#define DMA_RING_COHERENT_SET(m) (((u32 *)(m))[2] |= BIT(4)) >>>> +#define DMA_RING_ADDRL_SET(m, v) (((u32 *)(m))[2] |= (((v) >> 8) << 5)) >>>> +#define DMA_RING_ADDRH_SET(m, v) (((u32 *)(m))[3] |= ((v) >> 35)) >>>> +#define DMA_RING_ACCEPTLERR_SET(m) (((u32 *)(m))[3] |= BIT(19)) >>>> +#define DMA_RING_SIZE_SET(m, v) (((u32 *)(m))[3] |= ((v) << 23)) >>>> +#define DMA_RING_RECOMBBUF_SET(m) (((u32 *)(m))[3] |= BIT(27)) >>>> +#define DMA_RING_RECOMTIMEOUTL_SET(m) (((u32 *)(m))[3] |= (0x7 << 28)) >>>> +#define DMA_RING_RECOMTIMEOUTH_SET(m) (((u32 *)(m))[4] |= 0x3) >>>> +#define DMA_RING_SELTHRSH_SET(m) (((u32 *)(m))[4] |= BIT(3)) >>>> +#define DMA_RING_TYPE_SET(m, v) (((u32 *)(m))[4] |= ((v) << 19)) >>>> + >>>> +/* DMA device csr registers and bit definitions */ >>>> +#define DMA_IPBRR 0x0 >>>> +#define DMA_DEV_ID_RD(v) ((v) & 0x00000FFF) >>>> +#define DMA_BUS_ID_RD(v) (((v) >> 12) & 3) >>>> +#define DMA_REV_NO_RD(v) (((v) >> 14) & 3) >>>> +#define DMA_GCR 0x10 >>>> +#define DMA_CH_SETUP(v) ((v) = ((v) & ~0x000FFFFF) | 0x000AAFFF) >>>> +#define DMA_ENABLE(v) ((v) |= BIT(31)) >>>> +#define DMA_DISABLE(v) ((v) &= ~BIT(31)) >>>> +#define DMA_INT 0x70 >>>> +#define DMA_INT_MASK 0x74 >>>> +#define DMA_INT_ALL_MASK 0xFFFFFFFF >>>> +#define DMA_INT_ALL_UNMASK 0x0 >>>> +#define DMA_INT_MASK_SHIFT 0x14 >>>> +#define DMA_RING_INT0_MASK 0x90A0 >>>> +#define DMA_RING_INT1_MASK 0x90A8 >>>> +#define DMA_RING_INT2_MASK 0x90B0 >>>> +#define DMA_RING_INT3_MASK 0x90B8 >>>> +#define DMA_RING_INT4_MASK 0x90C0 >>>> +#define DMA_CFG_RING_WQ_ASSOC 0x90E0 >>>> +#define DMA_ASSOC_RING_MNGR1 0xFFFFFFFF >>>> +#define DMA_MEM_RAM_SHUTDOWN 0xD070 >>>> +#define DMA_BLK_MEM_RDY 0xD074 >>>> +#define DMA_BLK_MEM_RDY_VAL 0xFFFFFFFF >>>> + >>>> +/* DMA Descriptor format */ >>>> +#define DMA_DESC_ELERR_RD(m) (((m) >> 46) & 0x3) >>>> +#define DMA_DESC_NV_SET(m) (((u64 *)(m))[0] |= BIT_ULL(50)) >>>> +#define DMA_DESC_IN_SET(m) (((u64 *)(m))[0] |= BIT_ULL(55)) >>>> +#define DMA_DESC_RTYPE_SET(m, v) (((u64 *)(m))[0] |= ((u64)(v) << 56)) >>>> +#define DMA_DESC_LERR_RD(m) (((m) >> 60) & 0x7) >>>> +#define DMA_DESC_BUFADDR_SET(m, v) (((u64 *)(m))[0] |= (v)) >>>> +#define DMA_DESC_BUFLEN_SET(m, v) (((u64 *)(m))[0] |= ((u64)(v) << 48)) >>>> +#define DMA_DESC_C_SET(m) (((u64 *)(m))[1] |= BIT_ULL(63)) >>>> +#define DMA_DESC_DR_SET(m) (((u64 *)(m))[2] |= BIT_ULL(61)) >>>> +#define DMA_DESC_DST_ADDR_SET(m, v) (((u64 *)(m))[3] |= (v)) >>>> +#define DMA_DESC_H0ENQ_NUM_SET(m, v) (((u64 *)(m))[3] |= ((u64)(v) << 48)) >>>> +#define DMA_DESC_STATUS(x, y) (((x) << 4) | (y)) >> >> This is very difficult to read. >> > In the original source file it is well aligned, when I generate patch > and send, it scattered like this. >> Sorry I mis interpreted your comments. I will make these above define simpler. >> -- >> Ben Dooks http://www.codethink.co.uk/ >> Senior Engineer Codethink - Providing Genius -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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