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linux/drivers/dma/dw/regs.h
Christian Lamparter 7b0c03ecc4 dmaengine: dw-dmac: implement dma protection control setting 
This patch adds a new device-tree property that allows to
specify the dma protection control bits for the all of the
DMA controller's channel uniformly.

Setting the "correct" bits can have a huge impact on the
PPC460EX and APM82181 that use this DMA engine in combination
with a DesignWare' SATA-II core (sata_dwc_460ex driver).

In the OpenWrt Forum, the user takimata reported that:
|It seems your patch unleashed the full power of the SATA port.
|Where I was previously hitting a really hard limit at around
|82 MB/s for reading and 27 MB/s for writing, I am now getting this:
|
|root@OpenWrt:/mnt# time dd if=/dev/zero of=tempfile bs=1M count=1024
|1024+0 records in
|1024+0 records out
|real    0m 13.65s
|user    0m 0.01s
|sys     0m 11.89s
|
|root@OpenWrt:/mnt# time dd if=tempfile of=/dev/null bs=1M count=1024
|1024+0 records in
|1024+0 records out
|real    0m 8.41s
|user    0m 0.01s
|sys     0m 4.70s
|
|This means: 121 MB/s reading and 75 MB/s writing!
|
|The drive is a WD Green WD10EARX taken from an older MBL Single.
|I repeated the test a few times with even larger files to rule out
|any caching, I'm still seeing the same great performance. OpenWrt is
|now completely on par with the original MBL firmware's performance.

Another user And.short reported:
|I can report that your fix worked! Boots up fine with two
|drives even with more partitions, and no more reboot on
|concurrent disk access!

A closer look into the sata_dwc_460ex code revealed that
the driver did initally set the correct protection control
bits. However, this feature was lost when the sata_dwc_460ex
driver was converted to the generic DMA driver framework.

BugLink: https://forum.openwrt.org/t/wd-mybook-live-duo-two-disks/16195/55
BugLink: https://forum.openwrt.org/t/wd-mybook-live-duo-two-disks/16195/50
Fixes: 8b3444852a ("sata_dwc_460ex: move to generic DMA driver")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-11-24 20:07:22 +05:30

385 lines
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/*
* Driver for the Synopsys DesignWare AHB DMA Controller
*
* Copyright (C) 2005-2007 Atmel Corporation
* Copyright (C) 2010-2011 ST Microelectronics
* Copyright (C) 2016 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/io-64-nonatomic-hi-lo.h>
#include "internal.h"
#define DW_DMA_MAX_NR_REQUESTS 16
/* flow controller */
enum dw_dma_fc {
DW_DMA_FC_D_M2M,
DW_DMA_FC_D_M2P,
DW_DMA_FC_D_P2M,
DW_DMA_FC_D_P2P,
DW_DMA_FC_P_P2M,
DW_DMA_FC_SP_P2P,
DW_DMA_FC_P_M2P,
DW_DMA_FC_DP_P2P,
};
/*
* Redefine this macro to handle differences between 32- and 64-bit
* addressing, big vs. little endian, etc.
*/
#define DW_REG(name) u32 name; u32 __pad_##name
/* Hardware register definitions. */
struct dw_dma_chan_regs {
DW_REG(SAR); /* Source Address Register */
DW_REG(DAR); /* Destination Address Register */
DW_REG(LLP); /* Linked List Pointer */
u32 CTL_LO; /* Control Register Low */
u32 CTL_HI; /* Control Register High */
DW_REG(SSTAT);
DW_REG(DSTAT);
DW_REG(SSTATAR);
DW_REG(DSTATAR);
u32 CFG_LO; /* Configuration Register Low */
u32 CFG_HI; /* Configuration Register High */
DW_REG(SGR);
DW_REG(DSR);
};
struct dw_dma_irq_regs {
DW_REG(XFER);
DW_REG(BLOCK);
DW_REG(SRC_TRAN);
DW_REG(DST_TRAN);
DW_REG(ERROR);
};
struct dw_dma_regs {
/* per-channel registers */
struct dw_dma_chan_regs CHAN[DW_DMA_MAX_NR_CHANNELS];
/* irq handling */
struct dw_dma_irq_regs RAW; /* r */
struct dw_dma_irq_regs STATUS; /* r (raw & mask) */
struct dw_dma_irq_regs MASK; /* rw (set = irq enabled) */
struct dw_dma_irq_regs CLEAR; /* w (ack, affects "raw") */
DW_REG(STATUS_INT); /* r */
/* software handshaking */
DW_REG(REQ_SRC);
DW_REG(REQ_DST);
DW_REG(SGL_REQ_SRC);
DW_REG(SGL_REQ_DST);
DW_REG(LAST_SRC);
DW_REG(LAST_DST);
/* miscellaneous */
DW_REG(CFG);
DW_REG(CH_EN);
DW_REG(ID);
DW_REG(TEST);
/* iDMA 32-bit support */
DW_REG(CLASS_PRIORITY0);
DW_REG(CLASS_PRIORITY1);
/* optional encoded params, 0x3c8..0x3f7 */
u32 __reserved;
/* per-channel configuration registers */
u32 DWC_PARAMS[DW_DMA_MAX_NR_CHANNELS];
u32 MULTI_BLK_TYPE;
u32 MAX_BLK_SIZE;
/* top-level parameters */
u32 DW_PARAMS;
/* component ID */
u32 COMP_TYPE;
u32 COMP_VERSION;
/* iDMA 32-bit support */
DW_REG(FIFO_PARTITION0);
DW_REG(FIFO_PARTITION1);
DW_REG(SAI_ERR);
DW_REG(GLOBAL_CFG);
};
/* Bitfields in DW_PARAMS */
#define DW_PARAMS_NR_CHAN 8 /* number of channels */
#define DW_PARAMS_NR_MASTER 11 /* number of AHB masters */
#define DW_PARAMS_DATA_WIDTH(n) (15 + 2 * (n))
#define DW_PARAMS_DATA_WIDTH1 15 /* master 1 data width */
#define DW_PARAMS_DATA_WIDTH2 17 /* master 2 data width */
#define DW_PARAMS_DATA_WIDTH3 19 /* master 3 data width */
#define DW_PARAMS_DATA_WIDTH4 21 /* master 4 data width */
#define DW_PARAMS_EN 28 /* encoded parameters */
/* Bitfields in DWC_PARAMS */
#define DWC_PARAMS_MBLK_EN 11 /* multi block transfer */
/* bursts size */
enum dw_dma_msize {
DW_DMA_MSIZE_1,
DW_DMA_MSIZE_4,
DW_DMA_MSIZE_8,
DW_DMA_MSIZE_16,
DW_DMA_MSIZE_32,
DW_DMA_MSIZE_64,
DW_DMA_MSIZE_128,
DW_DMA_MSIZE_256,
};
/* Bitfields in LLP */
#define DWC_LLP_LMS(x) ((x) & 3) /* list master select */
#define DWC_LLP_LOC(x) ((x) & ~3) /* next lli */
/* Bitfields in CTL_LO */
#define DWC_CTLL_INT_EN (1 << 0) /* irqs enabled? */
#define DWC_CTLL_DST_WIDTH(n) ((n)<<1) /* bytes per element */
#define DWC_CTLL_SRC_WIDTH(n) ((n)<<4)
#define DWC_CTLL_DST_INC (0<<7) /* DAR update/not */
#define DWC_CTLL_DST_DEC (1<<7)
#define DWC_CTLL_DST_FIX (2<<7)
#define DWC_CTLL_SRC_INC (0<<9) /* SAR update/not */
#define DWC_CTLL_SRC_DEC (1<<9)
#define DWC_CTLL_SRC_FIX (2<<9)
#define DWC_CTLL_DST_MSIZE(n) ((n)<<11) /* burst, #elements */
#define DWC_CTLL_SRC_MSIZE(n) ((n)<<14)
#define DWC_CTLL_S_GATH_EN (1 << 17) /* src gather, !FIX */
#define DWC_CTLL_D_SCAT_EN (1 << 18) /* dst scatter, !FIX */
#define DWC_CTLL_FC(n) ((n) << 20)
#define DWC_CTLL_FC_M2M (0 << 20) /* mem-to-mem */
#define DWC_CTLL_FC_M2P (1 << 20) /* mem-to-periph */
#define DWC_CTLL_FC_P2M (2 << 20) /* periph-to-mem */
#define DWC_CTLL_FC_P2P (3 << 20) /* periph-to-periph */
/* plus 4 transfer types for peripheral-as-flow-controller */
#define DWC_CTLL_DMS(n) ((n)<<23) /* dst master select */
#define DWC_CTLL_SMS(n) ((n)<<25) /* src master select */
#define DWC_CTLL_LLP_D_EN (1 << 27) /* dest block chain */
#define DWC_CTLL_LLP_S_EN (1 << 28) /* src block chain */
/* Bitfields in CTL_HI */
#define DWC_CTLH_BLOCK_TS_MASK GENMASK(11, 0)
#define DWC_CTLH_BLOCK_TS(x) ((x) & DWC_CTLH_BLOCK_TS_MASK)
#define DWC_CTLH_DONE (1 << 12)
/* Bitfields in CFG_LO */
#define DWC_CFGL_CH_PRIOR_MASK (0x7 << 5) /* priority mask */
#define DWC_CFGL_CH_PRIOR(x) ((x) << 5) /* priority */
#define DWC_CFGL_CH_SUSP (1 << 8) /* pause xfer */
#define DWC_CFGL_FIFO_EMPTY (1 << 9) /* pause xfer */
#define DWC_CFGL_HS_DST (1 << 10) /* handshake w/dst */
#define DWC_CFGL_HS_SRC (1 << 11) /* handshake w/src */
#define DWC_CFGL_LOCK_CH_XFER (0 << 12) /* scope of LOCK_CH */
#define DWC_CFGL_LOCK_CH_BLOCK (1 << 12)
#define DWC_CFGL_LOCK_CH_XACT (2 << 12)
#define DWC_CFGL_LOCK_BUS_XFER (0 << 14) /* scope of LOCK_BUS */
#define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14)
#define DWC_CFGL_LOCK_BUS_XACT (2 << 14)
#define DWC_CFGL_LOCK_CH (1 << 15) /* channel lockout */
#define DWC_CFGL_LOCK_BUS (1 << 16) /* busmaster lockout */
#define DWC_CFGL_HS_DST_POL (1 << 18) /* dst handshake active low */
#define DWC_CFGL_HS_SRC_POL (1 << 19) /* src handshake active low */
#define DWC_CFGL_MAX_BURST(x) ((x) << 20)
#define DWC_CFGL_RELOAD_SAR (1 << 30)
#define DWC_CFGL_RELOAD_DAR (1 << 31)
/* Bitfields in CFG_HI */
#define DWC_CFGH_FCMODE (1 << 0)
#define DWC_CFGH_FIFO_MODE (1 << 1)
#define DWC_CFGH_PROTCTL(x) ((x) << 2)
#define DWC_CFGH_PROTCTL_DATA (0 << 2) /* data access - always set */
#define DWC_CFGH_PROTCTL_PRIV (1 << 2) /* privileged -> AHB HPROT[1] */
#define DWC_CFGH_PROTCTL_BUFFER (2 << 2) /* bufferable -> AHB HPROT[2] */
#define DWC_CFGH_PROTCTL_CACHE (4 << 2) /* cacheable -> AHB HPROT[3] */
#define DWC_CFGH_DS_UPD_EN (1 << 5)
#define DWC_CFGH_SS_UPD_EN (1 << 6)
#define DWC_CFGH_SRC_PER(x) ((x) << 7)
#define DWC_CFGH_DST_PER(x) ((x) << 11)
/* Bitfields in SGR */
#define DWC_SGR_SGI(x) ((x) << 0)
#define DWC_SGR_SGC(x) ((x) << 20)
/* Bitfields in DSR */
#define DWC_DSR_DSI(x) ((x) << 0)
#define DWC_DSR_DSC(x) ((x) << 20)
/* Bitfields in CFG */
#define DW_CFG_DMA_EN (1 << 0)
/* iDMA 32-bit support */
/* Bitfields in CTL_HI */
#define IDMA32C_CTLH_BLOCK_TS_MASK GENMASK(16, 0)
#define IDMA32C_CTLH_BLOCK_TS(x) ((x) & IDMA32C_CTLH_BLOCK_TS_MASK)
#define IDMA32C_CTLH_DONE (1 << 17)
/* Bitfields in CFG_LO */
#define IDMA32C_CFGL_DST_BURST_ALIGN (1 << 0) /* dst burst align */
#define IDMA32C_CFGL_SRC_BURST_ALIGN (1 << 1) /* src burst align */
#define IDMA32C_CFGL_CH_DRAIN (1 << 10) /* drain FIFO */
#define IDMA32C_CFGL_DST_OPT_BL (1 << 20) /* optimize dst burst length */
#define IDMA32C_CFGL_SRC_OPT_BL (1 << 21) /* optimize src burst length */
/* Bitfields in CFG_HI */
#define IDMA32C_CFGH_SRC_PER(x) ((x) << 0)
#define IDMA32C_CFGH_DST_PER(x) ((x) << 4)
#define IDMA32C_CFGH_RD_ISSUE_THD(x) ((x) << 8)
#define IDMA32C_CFGH_RW_ISSUE_THD(x) ((x) << 18)
#define IDMA32C_CFGH_SRC_PER_EXT(x) ((x) << 28) /* src peripheral extension */
#define IDMA32C_CFGH_DST_PER_EXT(x) ((x) << 30) /* dst peripheral extension */
/* Bitfields in FIFO_PARTITION */
#define IDMA32C_FP_PSIZE_CH0(x) ((x) << 0)
#define IDMA32C_FP_PSIZE_CH1(x) ((x) << 13)
#define IDMA32C_FP_UPDATE (1 << 26)
enum dw_dmac_flags {
DW_DMA_IS_CYCLIC = 0,
DW_DMA_IS_SOFT_LLP = 1,
DW_DMA_IS_PAUSED = 2,
DW_DMA_IS_INITIALIZED = 3,
};
struct dw_dma_chan {
struct dma_chan chan;
void __iomem *ch_regs;
u8 mask;
u8 priority;
enum dma_transfer_direction direction;
/* software emulation of the LLP transfers */
struct list_head *tx_node_active;
spinlock_t lock;
/* these other elements are all protected by lock */
unsigned long flags;
struct list_head active_list;
struct list_head queue;
unsigned int descs_allocated;
/* hardware configuration */
unsigned int block_size;
bool nollp;
/* custom slave configuration */
struct dw_dma_slave dws;
/* configuration passed via .device_config */
struct dma_slave_config dma_sconfig;
};
static inline struct dw_dma_chan_regs __iomem *
__dwc_regs(struct dw_dma_chan *dwc)
{
return dwc->ch_regs;
}
#define channel_readl(dwc, name) \
readl(&(__dwc_regs(dwc)->name))
#define channel_writel(dwc, name, val) \
writel((val), &(__dwc_regs(dwc)->name))
static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan)
{
return container_of(chan, struct dw_dma_chan, chan);
}
struct dw_dma {
struct dma_device dma;
char name[20];
void __iomem *regs;
struct dma_pool *desc_pool;
struct tasklet_struct tasklet;
/* channels */
struct dw_dma_chan *chan;
u8 all_chan_mask;
u8 in_use;
/* platform data */
struct dw_dma_platform_data *pdata;
};
static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw)
{
return dw->regs;
}
#define dma_readl(dw, name) \
readl(&(__dw_regs(dw)->name))
#define dma_writel(dw, name, val) \
writel((val), &(__dw_regs(dw)->name))
#define idma32_readq(dw, name) \
hi_lo_readq(&(__dw_regs(dw)->name))
#define idma32_writeq(dw, name, val) \
hi_lo_writeq((val), &(__dw_regs(dw)->name))
#define channel_set_bit(dw, reg, mask) \
dma_writel(dw, reg, ((mask) << 8) | (mask))
#define channel_clear_bit(dw, reg, mask) \
dma_writel(dw, reg, ((mask) << 8) | 0)
static inline struct dw_dma *to_dw_dma(struct dma_device *ddev)
{
return container_of(ddev, struct dw_dma, dma);
}
/* LLI == Linked List Item; a.k.a. DMA block descriptor */
struct dw_lli {
/* values that are not changed by hardware */
__le32 sar;
__le32 dar;
__le32 llp; /* chain to next lli */
__le32 ctllo;
/* values that may get written back: */
__le32 ctlhi;
/* sstat and dstat can snapshot peripheral register state.
* silicon config may discard either or both...
*/
__le32 sstat;
__le32 dstat;
};
struct dw_desc {
/* FIRST values the hardware uses */
struct dw_lli lli;
#define lli_set(d, reg, v) ((d)->lli.reg |= cpu_to_le32(v))
#define lli_clear(d, reg, v) ((d)->lli.reg &= ~cpu_to_le32(v))
#define lli_read(d, reg) le32_to_cpu((d)->lli.reg)
#define lli_write(d, reg, v) ((d)->lli.reg = cpu_to_le32(v))
/* THEN values for driver housekeeping */
struct list_head desc_node;
struct list_head tx_list;
struct dma_async_tx_descriptor txd;
size_t len;
size_t total_len;
u32 residue;
};
#define to_dw_desc(h) list_entry(h, struct dw_desc, desc_node)
static inline struct dw_desc *
txd_to_dw_desc(struct dma_async_tx_descriptor *txd)
{
return container_of(txd, struct dw_desc, txd);
}
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