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Message-ID: <54EF2CD9.8010104@codethink.co.uk> Date: Thu, 26 Feb 2015 14:25:29 +0000 From: Ben Dooks <ben.dooks@...ethink.co.uk> To: Rameshwar Sahu <rsahu@....com>, Vinod Koul <vinod.koul@...el.com>, dan.j.williams@...el.com CC: 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 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. -- 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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