@@ -10,6 +10,7 @@
*/
#include <dt-bindings/dma/at91.h>
+#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
@@ -35,172 +36,151 @@
#define AT_DMA_MAX_NR_CHANNELS 8
-#define AT_DMA_GCFG 0x00 /* Global Configuration Register */
-#define AT_DMA_IF_BIGEND(i) (0x1 << (i)) /* AHB-Lite Interface i in Big-endian mode */
-#define AT_DMA_ARB_CFG (0x1 << 4) /* Arbiter mode. */
-#define AT_DMA_ARB_CFG_FIXED (0x0 << 4)
-#define AT_DMA_ARB_CFG_ROUND_ROBIN (0x1 << 4)
+/* Global Configuration Register */
+#define AT_DMA_GCFG 0x00
+#define AT_DMA_IF_BIGEND(i) BIT((i)) /* AHB-Lite Interface i in Big-endian mode */
+#define AT_DMA_ARB_CFG BIT(4) /* Arbiter mode. */
-#define AT_DMA_EN 0x04 /* Controller Enable Register */
-#define AT_DMA_ENABLE (0x1 << 0)
+/* Controller Enable Register */
+#define AT_DMA_EN 0x04
+#define AT_DMA_ENABLE BIT(0)
-#define AT_DMA_SREQ 0x08 /* Software Single Request Register */
-#define AT_DMA_SSREQ(x) (0x1 << ((x) << 1)) /* Request a source single transfer on channel x */
-#define AT_DMA_DSREQ(x) (0x1 << (1 + ((x) << 1))) /* Request a destination single transfer on channel x */
+/* Software Single Request Register */
+#define AT_DMA_SREQ 0x08
+#define AT_DMA_SSREQ(x) BIT((x) << 1) /* Request a source single transfer on channel x */
+#define AT_DMA_DSREQ(x) BIT(1 + ((x) << 1)) /* Request a destination single transfer on channel x */
-#define AT_DMA_CREQ 0x0C /* Software Chunk Transfer Request Register */
-#define AT_DMA_SCREQ(x) (0x1 << ((x) << 1)) /* Request a source chunk transfer on channel x */
-#define AT_DMA_DCREQ(x) (0x1 << (1 + ((x) << 1))) /* Request a destination chunk transfer on channel x */
+/* Software Chunk Transfer Request Register */
+#define AT_DMA_CREQ 0x0c
+#define AT_DMA_SCREQ(x) BIT((x) << 1) /* Request a source chunk transfer on channel x */
+#define AT_DMA_DCREQ(x) BIT(1 + ((x) << 1)) /* Request a destination chunk transfer on channel x */
-#define AT_DMA_LAST 0x10 /* Software Last Transfer Flag Register */
-#define AT_DMA_SLAST(x) (0x1 << ((x) << 1)) /* This src rq is last tx of buffer on channel x */
-#define AT_DMA_DLAST(x) (0x1 << (1 + ((x) << 1))) /* This dst rq is last tx of buffer on channel x */
+/* Software Last Transfer Flag Register */
+#define AT_DMA_LAST 0x10
+#define AT_DMA_SLAST(x) BIT((x) << 1) /* This src rq is last tx of buffer on channel x */
+#define AT_DMA_DLAST(x) BIT(1 + ((x) << 1)) /* This dst rq is last tx of buffer on channel x */
-#define AT_DMA_SYNC 0x14 /* Request Synchronization Register */
-#define AT_DMA_SYR(h) (0x1 << (h)) /* Synchronize handshake line h */
+/* Request Synchronization Register */
+#define AT_DMA_SYNC 0x14
+#define AT_DMA_SYR(h) BIT((h)) /* Synchronize handshake line h */
/* Error, Chained Buffer transfer completed and Buffer transfer completed Interrupt registers */
-#define AT_DMA_EBCIER 0x18 /* Enable register */
-#define AT_DMA_EBCIDR 0x1C /* Disable register */
-#define AT_DMA_EBCIMR 0x20 /* Mask Register */
-#define AT_DMA_EBCISR 0x24 /* Status Register */
-#define AT_DMA_CBTC_OFFSET 8
-#define AT_DMA_ERR_OFFSET 16
-#define AT_DMA_BTC(x) (0x1 << (x))
-#define AT_DMA_CBTC(x) (0x1 << (AT_DMA_CBTC_OFFSET + (x)))
-#define AT_DMA_ERR(x) (0x1 << (AT_DMA_ERR_OFFSET + (x)))
-
-#define AT_DMA_CHER 0x28 /* Channel Handler Enable Register */
-#define AT_DMA_ENA(x) (0x1 << (x))
-#define AT_DMA_SUSP(x) (0x1 << ( 8 + (x)))
-#define AT_DMA_KEEP(x) (0x1 << (24 + (x)))
-
-#define AT_DMA_CHDR 0x2C /* Channel Handler Disable Register */
-#define AT_DMA_DIS(x) (0x1 << (x))
-#define AT_DMA_RES(x) (0x1 << ( 8 + (x)))
-
-#define AT_DMA_CHSR 0x30 /* Channel Handler Status Register */
-#define AT_DMA_EMPT(x) (0x1 << (16 + (x)))
-#define AT_DMA_STAL(x) (0x1 << (24 + (x)))
-
-#define AT_DMA_CH_REGS_BASE 0x3C /* Channel registers base address */
-#define ch_regs(x) (AT_DMA_CH_REGS_BASE + (x) * 0x28) /* Channel x base addr */
+#define AT_DMA_EBCIER 0x18 /* Enable register */
+#define AT_DMA_EBCIDR 0x1c /* Disable register */
+#define AT_DMA_EBCIMR 0x20 /* Mask Register */
+#define AT_DMA_EBCISR 0x24 /* Status Register */
+#define AT_DMA_CBTC_OFFSET 8
+#define AT_DMA_ERR_OFFSET 16
+#define AT_DMA_BTC(x) BIT((x))
+#define AT_DMA_CBTC(x) BIT(AT_DMA_CBTC_OFFSET + (x))
+#define AT_DMA_ERR(x) BIT(AT_DMA_ERR_OFFSET + (x))
+
+/* Channel Handler Enable Register */
+#define AT_DMA_CHER 0x28
+#define AT_DMA_ENA(x) BIT((x))
+#define AT_DMA_SUSP(x) BIT(8 + (x))
+#define AT_DMA_KEEP(x) BIT(24 + (x))
+
+/* Channel Handler Disable Register */
+#define AT_DMA_CHDR 0x2c
+#define AT_DMA_DIS(x) BIT(x)
+#define AT_DMA_RES(x) BIT(8 + (x))
+
+/* Channel Handler Status Register */
+#define AT_DMA_CHSR 0x30
+#define AT_DMA_EMPT(x) BIT(16 + (x))
+#define AT_DMA_STAL(x) BIT(24 + (x))
+
+/* Channel registers base address */
+#define AT_DMA_CH_REGS_BASE 0x3c
+#define ch_regs(x) (AT_DMA_CH_REGS_BASE + (x) * 0x28) /* Channel x base addr */
/* Hardware register offset for each channel */
-#define ATC_SADDR_OFFSET 0x00 /* Source Address Register */
-#define ATC_DADDR_OFFSET 0x04 /* Destination Address Register */
-#define ATC_DSCR_OFFSET 0x08 /* Descriptor Address Register */
-#define ATC_CTRLA_OFFSET 0x0C /* Control A Register */
-#define ATC_CTRLB_OFFSET 0x10 /* Control B Register */
-#define ATC_CFG_OFFSET 0x14 /* Configuration Register */
-#define ATC_SPIP_OFFSET 0x18 /* Src PIP Configuration Register */
-#define ATC_DPIP_OFFSET 0x1C /* Dst PIP Configuration Register */
+#define ATC_SADDR_OFFSET 0x00 /* Source Address Register */
+#define ATC_DADDR_OFFSET 0x04 /* Destination Address Register */
+#define ATC_DSCR_OFFSET 0x08 /* Descriptor Address Register */
+#define ATC_CTRLA_OFFSET 0x0c /* Control A Register */
+#define ATC_CTRLB_OFFSET 0x10 /* Control B Register */
+#define ATC_CFG_OFFSET 0x14 /* Configuration Register */
+#define ATC_SPIP_OFFSET 0x18 /* Src PIP Configuration Register */
+#define ATC_DPIP_OFFSET 0x1c /* Dst PIP Configuration Register */
/* Bitfield definitions */
/* Bitfields in DSCR */
-#define ATC_DSCR_IF(i) (0x3 & (i)) /* Dsc feched via AHB-Lite Interface i */
+#define ATC_DSCR_IF GENMASK(1, 0) /* Dsc feched via AHB-Lite Interface */
/* Bitfields in CTRLA */
-#define ATC_BTSIZE_MAX 0xFFFFUL /* Maximum Buffer Transfer Size */
-#define ATC_BTSIZE(x) (ATC_BTSIZE_MAX & (x)) /* Buffer Transfer Size */
-#define ATC_SCSIZE_MASK (0x7 << 16) /* Source Chunk Transfer Size */
-#define ATC_SCSIZE(x) (ATC_SCSIZE_MASK & ((x) << 16))
-#define ATC_SCSIZE_1 (0x0 << 16)
-#define ATC_SCSIZE_4 (0x1 << 16)
-#define ATC_SCSIZE_8 (0x2 << 16)
-#define ATC_SCSIZE_16 (0x3 << 16)
-#define ATC_SCSIZE_32 (0x4 << 16)
-#define ATC_SCSIZE_64 (0x5 << 16)
-#define ATC_SCSIZE_128 (0x6 << 16)
-#define ATC_SCSIZE_256 (0x7 << 16)
-#define ATC_DCSIZE_MASK (0x7 << 20) /* Destination Chunk Transfer Size */
-#define ATC_DCSIZE(x) (ATC_DCSIZE_MASK & ((x) << 20))
-#define ATC_DCSIZE_1 (0x0 << 20)
-#define ATC_DCSIZE_4 (0x1 << 20)
-#define ATC_DCSIZE_8 (0x2 << 20)
-#define ATC_DCSIZE_16 (0x3 << 20)
-#define ATC_DCSIZE_32 (0x4 << 20)
-#define ATC_DCSIZE_64 (0x5 << 20)
-#define ATC_DCSIZE_128 (0x6 << 20)
-#define ATC_DCSIZE_256 (0x7 << 20)
-#define ATC_SRC_WIDTH_MASK (0x3 << 24) /* Source Single Transfer Size */
-#define ATC_SRC_WIDTH(x) ((x) << 24)
-#define ATC_SRC_WIDTH_BYTE (0x0 << 24)
-#define ATC_SRC_WIDTH_HALFWORD (0x1 << 24)
-#define ATC_SRC_WIDTH_WORD (0x2 << 24)
-#define ATC_REG_TO_SRC_WIDTH(r) (((r) >> 24) & 0x3)
-#define ATC_DST_WIDTH_MASK (0x3 << 28) /* Destination Single Transfer Size */
-#define ATC_DST_WIDTH(x) ((x) << 28)
-#define ATC_DST_WIDTH_BYTE (0x0 << 28)
-#define ATC_DST_WIDTH_HALFWORD (0x1 << 28)
-#define ATC_DST_WIDTH_WORD (0x2 << 28)
-#define ATC_DONE (0x1 << 31) /* Tx Done (only written back in descriptor) */
+#define ATC_BTSIZE_MAX GENMASK(15, 0) /* Maximum Buffer Transfer Size */
+#define ATC_BTSIZE GENMASK(15, 0) /* Buffer Transfer Size */
+#define ATC_SCSIZE GENMASK(18, 16) /* Source Chunk Transfer Size */
+#define ATC_DCSIZE GENMASK(22, 20) /* Destination Chunk Transfer Size */
+#define ATC_SRC_WIDTH GENMASK(25, 24) /* Source Single Transfer Size */
+#define ATC_DST_WIDTH GENMASK(29, 28) /* Destination Single Transfer Size */
+#define ATC_DONE BIT(31) /* Tx Done (only written back in descriptor) */
/* Bitfields in CTRLB */
-#define ATC_SIF(i) (0x3 & (i)) /* Src tx done via AHB-Lite Interface i */
-#define ATC_DIF(i) ((0x3 & (i)) << 4) /* Dst tx done via AHB-Lite Interface i */
- /* Specify AHB interfaces */
-#define AT_DMA_MEM_IF 0 /* interface 0 as memory interface */
-#define AT_DMA_PER_IF 1 /* interface 1 as peripheral interface */
-
-#define ATC_SRC_PIP (0x1 << 8) /* Source Picture-in-Picture enabled */
-#define ATC_DST_PIP (0x1 << 12) /* Destination Picture-in-Picture enabled */
-#define ATC_SRC_DSCR_DIS (0x1 << 16) /* Src Descriptor fetch disable */
-#define ATC_DST_DSCR_DIS (0x1 << 20) /* Dst Descriptor fetch disable */
-#define ATC_FC_MASK (0x7 << 21) /* Choose Flow Controller */
-#define ATC_FC_MEM2MEM (0x0 << 21) /* Mem-to-Mem (DMA) */
-#define ATC_FC_MEM2PER (0x1 << 21) /* Mem-to-Periph (DMA) */
-#define ATC_FC_PER2MEM (0x2 << 21) /* Periph-to-Mem (DMA) */
-#define ATC_FC_PER2PER (0x3 << 21) /* Periph-to-Periph (DMA) */
-#define ATC_FC_PER2MEM_PER (0x4 << 21) /* Periph-to-Mem (Peripheral) */
-#define ATC_FC_MEM2PER_PER (0x5 << 21) /* Mem-to-Periph (Peripheral) */
-#define ATC_FC_PER2PER_SRCPER (0x6 << 21) /* Periph-to-Periph (Src Peripheral) */
-#define ATC_FC_PER2PER_DSTPER (0x7 << 21) /* Periph-to-Periph (Dst Peripheral) */
-#define ATC_SRC_ADDR_MODE_MASK (0x3 << 24)
-#define ATC_SRC_ADDR_MODE_INCR (0x0 << 24) /* Incrementing Mode */
-#define ATC_SRC_ADDR_MODE_DECR (0x1 << 24) /* Decrementing Mode */
-#define ATC_SRC_ADDR_MODE_FIXED (0x2 << 24) /* Fixed Mode */
-#define ATC_DST_ADDR_MODE_MASK (0x3 << 28)
-#define ATC_DST_ADDR_MODE_INCR (0x0 << 28) /* Incrementing Mode */
-#define ATC_DST_ADDR_MODE_DECR (0x1 << 28) /* Decrementing Mode */
-#define ATC_DST_ADDR_MODE_FIXED (0x2 << 28) /* Fixed Mode */
-#define ATC_IEN (0x1 << 30) /* BTC interrupt enable (active low) */
-#define ATC_AUTO (0x1 << 31) /* Auto multiple buffer tx enable */
+#define ATC_SIF GENMASK(1, 0) /* Src tx done via AHB-Lite Interface i */
+#define ATC_DIF GENMASK(5, 4) /* Dst tx done via AHB-Lite Interface i */
+#define AT_DMA_MEM_IF 0x0 /* interface 0 as memory interface */
+#define AT_DMA_PER_IF 0x1 /* interface 1 as peripheral interface */
+#define ATC_SRC_PIP BIT(8) /* Source Picture-in-Picture enabled */
+#define ATC_DST_PIP BIT(12) /* Destination Picture-in-Picture enabled */
+#define ATC_SRC_DSCR_DIS BIT(16) /* Src Descriptor fetch disable */
+#define ATC_DST_DSCR_DIS BIT(20) /* Dst Descriptor fetch disable */
+#define ATC_FC GENMASK(22, 21) /* Choose Flow Controller */
+#define ATC_FC_MEM2MEM 0x0 /* Mem-to-Mem (DMA) */
+#define ATC_FC_MEM2PER 0x1 /* Mem-to-Periph (DMA) */
+#define ATC_FC_PER2MEM 0x2 /* Periph-to-Mem (DMA) */
+#define ATC_FC_PER2PER 0x3 /* Periph-to-Periph (DMA) */
+#define ATC_FC_PER2MEM_PER 0x4 /* Periph-to-Mem (Peripheral) */
+#define ATC_FC_MEM2PER_PER 0x5 /* Mem-to-Periph (Peripheral) */
+#define ATC_FC_PER2PER_SRCPER 0x6 /* Periph-to-Periph (Src Peripheral) */
+#define ATC_FC_PER2PER_DSTPER 0x7 /* Periph-to-Periph (Dst Peripheral) */
+#define ATC_SRC_ADDR_MODE GENMASK(25, 24)
+#define ATC_SRC_ADDR_MODE_INCR 0x0 /* Incrementing Mode */
+#define ATC_SRC_ADDR_MODE_DECR 0x1 /* Decrementing Mode */
+#define ATC_SRC_ADDR_MODE_FIXED 0x2 /* Fixed Mode */
+#define ATC_DST_ADDR_MODE GENMASK(29, 28)
+#define ATC_DST_ADDR_MODE_INCR 0x0 /* Incrementing Mode */
+#define ATC_DST_ADDR_MODE_DECR 0x1 /* Decrementing Mode */
+#define ATC_DST_ADDR_MODE_FIXED 0x2 /* Fixed Mode */
+#define ATC_IEN BIT(30) /* BTC interrupt enable (active low) */
+#define ATC_AUTO BIT(31) /* Auto multiple buffer tx enable */
/* Bitfields in CFG */
#define ATC_PER_MSB(h) ((0x30U & (h)) >> 4) /* Extract most significant bits of a handshaking identifier */
-#define ATC_SRC_PER(h) (0xFU & (h)) /* Channel src rq associated with periph handshaking ifc h */
-#define ATC_DST_PER(h) ((0xFU & (h)) << 4) /* Channel dst rq associated with periph handshaking ifc h */
-#define ATC_SRC_REP (0x1 << 8) /* Source Replay Mod */
-#define ATC_SRC_H2SEL (0x1 << 9) /* Source Handshaking Mod */
-#define ATC_SRC_H2SEL_SW (0x0 << 9)
-#define ATC_SRC_H2SEL_HW (0x1 << 9)
-#define ATC_SRC_PER_MSB(h) (ATC_PER_MSB(h) << 10) /* Channel src rq (most significant bits) */
-#define ATC_DST_REP (0x1 << 12) /* Destination Replay Mod */
-#define ATC_DST_H2SEL (0x1 << 13) /* Destination Handshaking Mod */
-#define ATC_DST_H2SEL_SW (0x0 << 13)
-#define ATC_DST_H2SEL_HW (0x1 << 13)
-#define ATC_DST_PER_MSB(h) (ATC_PER_MSB(h) << 14) /* Channel dst rq (most significant bits) */
-#define ATC_SOD (0x1 << 16) /* Stop On Done */
-#define ATC_LOCK_IF (0x1 << 20) /* Interface Lock */
-#define ATC_LOCK_B (0x1 << 21) /* AHB Bus Lock */
-#define ATC_LOCK_IF_L (0x1 << 22) /* Master Interface Arbiter Lock */
-#define ATC_LOCK_IF_L_CHUNK (0x0 << 22)
-#define ATC_LOCK_IF_L_BUFFER (0x1 << 22)
-#define ATC_AHB_PROT_MASK (0x7 << 24) /* AHB Protection */
-#define ATC_FIFOCFG_MASK (0x3 << 28) /* FIFO Request Configuration */
-#define ATC_FIFOCFG_LARGESTBURST (0x0 << 28)
-#define ATC_FIFOCFG_HALFFIFO (0x1 << 28)
-#define ATC_FIFOCFG_ENOUGHSPACE (0x2 << 28)
+#define ATC_SRC_PER GENMASK(3, 0) /* Channel src rq associated with periph handshaking ifc h */
+#define ATC_DST_PER GENMASK(7, 4) /* Channel dst rq associated with periph handshaking ifc h */
+#define ATC_SRC_REP BIT(8) /* Source Replay Mod */
+#define ATC_SRC_H2SEL BIT(9) /* Source Handshaking Mod */
+#define ATC_SRC_PER_MSB GENMASK(11, 10) /* Channel src rq (most significant bits) */
+#define ATC_DST_REP BIT(12) /* Destination Replay Mod */
+#define ATC_DST_H2SEL BIT(13) /* Destination Handshaking Mod */
+#define ATC_DST_PER_MSB GENMASK(15, 14) /* Channel dst rq (most significant bits) */
+#define ATC_SOD BIT(16) /* Stop On Done */
+#define ATC_LOCK_IF BIT(20) /* Interface Lock */
+#define ATC_LOCK_B BIT(21) /* AHB Bus Lock */
+#define ATC_LOCK_IF_L BIT(22) /* Master Interface Arbiter Lock */
+#define ATC_AHB_PROT GENMASK(26, 24) /* AHB Protection */
+#define ATC_FIFOCFG GENMASK(29, 28) /* FIFO Request Configuration */
+#define ATC_FIFOCFG_LARGESTBURST 0x0
+#define ATC_FIFOCFG_HALFFIFO 0x1
+#define ATC_FIFOCFG_ENOUGHSPACE 0x2
/* Bitfields in SPIP */
-#define ATC_SPIP_HOLE(x) (0xFFFFU & (x))
-#define ATC_SPIP_BOUNDARY(x) ((0x3FF & (x)) << 16)
+#define ATC_SPIP_HOLE GENMASK(15, 0)
+#define ATC_SPIP_BOUNDARY GENMASK(25, 16)
/* Bitfields in DPIP */
-#define ATC_DPIP_HOLE(x) (0xFFFFU & (x))
-#define ATC_DPIP_BOUNDARY(x) ((0x3FF & (x)) << 16)
+#define ATC_DPIP_HOLE GENMASK(15, 0)
+#define ATC_DPIP_BOUNDARY GENMASK(25, 16)
+
+#define ATC_SRC_PER_ID(id) (FIELD_PREP(ATC_SRC_PER_MSB, (id)) | \
+ FIELD_PREP(ATC_SRC_PER, (id)))
+#define ATC_DST_PER_ID(id) (FIELD_PREP(ATC_DST_PER_MSB, (id)) | \
+ FIELD_PREP(ATC_DST_PER, (id)))
+
/*-- descriptors -----------------------------------------------------*/
@@ -489,9 +469,9 @@ static void set_desc_eol(struct at_desc *desc)
desc->lli.dscr = 0;
}
-#define ATC_DEFAULT_CFG (ATC_FIFOCFG_HALFFIFO)
-#define ATC_DEFAULT_CTRLB (ATC_SIF(AT_DMA_MEM_IF) \
- |ATC_DIF(AT_DMA_MEM_IF))
+#define ATC_DEFAULT_CFG FIELD_PREP(ATC_FIFOCFG, ATC_FIFOCFG_HALFFIFO)
+#define ATC_DEFAULT_CTRLB (FIELD_PREP(ATC_SIF, AT_DMA_MEM_IF) | \
+ FIELD_PREP(ATC_DIF, AT_DMA_MEM_IF))
#define ATC_DMA_BUSWIDTHS\
(BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) |\
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |\
@@ -707,10 +687,12 @@ static void atc_dostart(struct at_dma_chan *atchan, struct at_desc *first)
channel_writel(atchan, CTRLA, 0);
channel_writel(atchan, CTRLB, 0);
channel_writel(atchan, DSCR, first->txd.phys);
- channel_writel(atchan, SPIP, ATC_SPIP_HOLE(first->src_hole) |
- ATC_SPIP_BOUNDARY(first->boundary));
- channel_writel(atchan, DPIP, ATC_DPIP_HOLE(first->dst_hole) |
- ATC_DPIP_BOUNDARY(first->boundary));
+ channel_writel(atchan, SPIP, FIELD_PREP(ATC_SPIP_HOLE,
+ first->src_hole) |
+ FIELD_PREP(ATC_SPIP_BOUNDARY, first->boundary));
+ channel_writel(atchan, DPIP, FIELD_PREP(ATC_DPIP_HOLE,
+ first->dst_hole) |
+ FIELD_PREP(ATC_DPIP_BOUNDARY, first->boundary));
dma_writel(atdma, CHER, atchan->mask);
vdbg_dump_regs(atchan);
@@ -748,8 +730,8 @@ static struct at_desc *atc_get_desc_by_cookie(struct at_dma_chan *atchan,
*/
static inline int atc_calc_bytes_left(int current_len, u32 ctrla)
{
- u32 btsize = (ctrla & ATC_BTSIZE_MAX);
- u32 src_width = ATC_REG_TO_SRC_WIDTH(ctrla);
+ u32 btsize = FIELD_GET(ATC_BTSIZE, ctrla);
+ u32 src_width = FIELD_GET(ATC_SRC_WIDTH, ctrla);
/*
* According to the datasheet, when reading the Control A Register
@@ -1223,15 +1205,14 @@ atc_prep_dma_interleaved(struct dma_chan *chan,
return NULL;
}
- ctrla = ATC_SRC_WIDTH(dwidth) |
- ATC_DST_WIDTH(dwidth);
+ ctrla = FIELD_PREP(ATC_SRC_WIDTH, dwidth) |
+ FIELD_PREP(ATC_DST_WIDTH, dwidth);
- ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN
- | ATC_SRC_ADDR_MODE_INCR
- | ATC_DST_ADDR_MODE_INCR
- | ATC_SRC_PIP
- | ATC_DST_PIP
- | ATC_FC_MEM2MEM;
+ ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN |
+ FIELD_PREP(ATC_SRC_ADDR_MODE, ATC_SRC_ADDR_MODE_INCR) |
+ FIELD_PREP(ATC_DST_ADDR_MODE, ATC_DST_ADDR_MODE_INCR) |
+ ATC_SRC_PIP | ATC_DST_PIP |
+ FIELD_PREP(ATC_FC, ATC_FC_MEM2MEM);
/* create the transfer */
desc = atc_desc_get(atchan);
@@ -1292,10 +1273,10 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
return NULL;
}
- ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN
- | ATC_SRC_ADDR_MODE_INCR
- | ATC_DST_ADDR_MODE_INCR
- | ATC_FC_MEM2MEM;
+ ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN |
+ FIELD_PREP(ATC_SRC_ADDR_MODE, ATC_SRC_ADDR_MODE_INCR) |
+ FIELD_PREP(ATC_DST_ADDR_MODE, ATC_DST_ADDR_MODE_INCR) |
+ FIELD_PREP(ATC_FC, ATC_FC_MEM2MEM);
/*
* We can be a lot more clever here, but this should take care
@@ -1303,8 +1284,8 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
*/
src_width = dst_width = atc_get_xfer_width(src, dest, len);
- ctrla = ATC_SRC_WIDTH(src_width) |
- ATC_DST_WIDTH(dst_width);
+ ctrla = FIELD_PREP(ATC_SRC_WIDTH, src_width) |
+ FIELD_PREP(ATC_DST_WIDTH, dst_width);
for (offset = 0; offset < len; offset += xfer_count << src_width) {
xfer_count = min_t(size_t, (len - offset) >> src_width,
@@ -1350,11 +1331,11 @@ static struct at_desc *atc_create_memset_desc(struct dma_chan *chan,
struct at_desc *desc;
size_t xfer_count;
- u32 ctrla = ATC_SRC_WIDTH(2) | ATC_DST_WIDTH(2);
+ u32 ctrla = FIELD_PREP(ATC_SRC_WIDTH, 2) | FIELD_PREP(ATC_DST_WIDTH, 2);
u32 ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN |
- ATC_SRC_ADDR_MODE_FIXED |
- ATC_DST_ADDR_MODE_INCR |
- ATC_FC_MEM2MEM;
+ FIELD_PREP(ATC_SRC_ADDR_MODE, ATC_SRC_ADDR_MODE_FIXED) |
+ FIELD_PREP(ATC_DST_ADDR_MODE, ATC_DST_ADDR_MODE_INCR) |
+ FIELD_PREP(ATC_FC, ATC_FC_MEM2MEM);
xfer_count = len >> 2;
if (xfer_count > ATC_BTSIZE_MAX) {
@@ -1569,18 +1550,20 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
return NULL;
}
- ctrla = ATC_SCSIZE(sconfig->src_maxburst)
- | ATC_DCSIZE(sconfig->dst_maxburst);
+ ctrla = FIELD_PREP(ATC_SCSIZE, sconfig->src_maxburst) |
+ FIELD_PREP(ATC_DCSIZE, sconfig->dst_maxburst);
ctrlb = ATC_IEN;
switch (direction) {
case DMA_MEM_TO_DEV:
reg_width = convert_buswidth(sconfig->dst_addr_width);
- ctrla |= ATC_DST_WIDTH(reg_width);
- ctrlb |= ATC_DST_ADDR_MODE_FIXED
- | ATC_SRC_ADDR_MODE_INCR
- | ATC_FC_MEM2PER
- | ATC_SIF(atchan->mem_if) | ATC_DIF(atchan->per_if);
+ ctrla |= FIELD_PREP(ATC_DST_WIDTH, reg_width);
+ ctrlb |= FIELD_PREP(ATC_DST_ADDR_MODE,
+ ATC_DST_ADDR_MODE_FIXED) |
+ FIELD_PREP(ATC_SRC_ADDR_MODE, ATC_SRC_ADDR_MODE_INCR) |
+ FIELD_PREP(ATC_FC, ATC_FC_MEM2PER) |
+ FIELD_PREP(ATC_SIF, atchan->mem_if) |
+ FIELD_PREP(ATC_DIF, atchan->per_if);
reg = sconfig->dst_addr;
for_each_sg(sgl, sg, sg_len, i) {
struct at_desc *desc;
@@ -1604,9 +1587,9 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
desc->lli.saddr = mem;
desc->lli.daddr = reg;
- desc->lli.ctrla = ctrla
- | ATC_SRC_WIDTH(mem_width)
- | len >> mem_width;
+ desc->lli.ctrla = ctrla |
+ FIELD_PREP(ATC_SRC_WIDTH, mem_width) |
+ len >> mem_width;
desc->lli.ctrlb = ctrlb;
desc->len = len;
@@ -1616,11 +1599,13 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
break;
case DMA_DEV_TO_MEM:
reg_width = convert_buswidth(sconfig->src_addr_width);
- ctrla |= ATC_SRC_WIDTH(reg_width);
- ctrlb |= ATC_DST_ADDR_MODE_INCR
- | ATC_SRC_ADDR_MODE_FIXED
- | ATC_FC_PER2MEM
- | ATC_SIF(atchan->per_if) | ATC_DIF(atchan->mem_if);
+ ctrla |= FIELD_PREP(ATC_SRC_WIDTH, reg_width);
+ ctrlb |= FIELD_PREP(ATC_DST_ADDR_MODE, ATC_DST_ADDR_MODE_INCR) |
+ FIELD_PREP(ATC_SRC_ADDR_MODE,
+ ATC_SRC_ADDR_MODE_FIXED) |
+ FIELD_PREP(ATC_FC, ATC_FC_PER2MEM) |
+ FIELD_PREP(ATC_SIF, atchan->per_if) |
+ FIELD_PREP(ATC_DIF, atchan->mem_if);
reg = sconfig->src_addr;
for_each_sg(sgl, sg, sg_len, i) {
@@ -1645,9 +1630,9 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
desc->lli.saddr = reg;
desc->lli.daddr = mem;
- desc->lli.ctrla = ctrla
- | ATC_DST_WIDTH(mem_width)
- | len >> reg_width;
+ desc->lli.ctrla = ctrla |
+ FIELD_PREP(ATC_DST_WIDTH, mem_width) |
+ len >> reg_width;
desc->lli.ctrlb = ctrlb;
desc->len = len;
@@ -1713,22 +1698,24 @@ atc_dma_cyclic_fill_desc(struct dma_chan *chan, struct at_desc *desc,
u32 ctrla;
/* prepare common CRTLA value */
- ctrla = ATC_SCSIZE(sconfig->src_maxburst)
- | ATC_DCSIZE(sconfig->dst_maxburst)
- | ATC_DST_WIDTH(reg_width)
- | ATC_SRC_WIDTH(reg_width)
- | period_len >> reg_width;
+ ctrla = FIELD_PREP(ATC_SCSIZE, sconfig->src_maxburst) |
+ FIELD_PREP(ATC_DCSIZE, sconfig->dst_maxburst) |
+ FIELD_PREP(ATC_DST_WIDTH, reg_width) |
+ FIELD_PREP(ATC_SRC_WIDTH, reg_width) |
+ period_len >> reg_width;
switch (direction) {
case DMA_MEM_TO_DEV:
desc->lli.saddr = buf_addr + (period_len * period_index);
desc->lli.daddr = sconfig->dst_addr;
desc->lli.ctrla = ctrla;
- desc->lli.ctrlb = ATC_DST_ADDR_MODE_FIXED
- | ATC_SRC_ADDR_MODE_INCR
- | ATC_FC_MEM2PER
- | ATC_SIF(atchan->mem_if)
- | ATC_DIF(atchan->per_if);
+ desc->lli.ctrlb = FIELD_PREP(ATC_DST_ADDR_MODE,
+ ATC_DST_ADDR_MODE_FIXED) |
+ FIELD_PREP(ATC_SRC_ADDR_MODE,
+ ATC_SRC_ADDR_MODE_INCR) |
+ FIELD_PREP(ATC_FC, ATC_FC_MEM2PER) |
+ FIELD_PREP(ATC_SIF, atchan->mem_if) |
+ FIELD_PREP(ATC_DIF, atchan->per_if);
desc->len = period_len;
break;
@@ -1736,11 +1723,13 @@ atc_dma_cyclic_fill_desc(struct dma_chan *chan, struct at_desc *desc,
desc->lli.saddr = sconfig->src_addr;
desc->lli.daddr = buf_addr + (period_len * period_index);
desc->lli.ctrla = ctrla;
- desc->lli.ctrlb = ATC_DST_ADDR_MODE_INCR
- | ATC_SRC_ADDR_MODE_FIXED
- | ATC_FC_PER2MEM
- | ATC_SIF(atchan->per_if)
- | ATC_DIF(atchan->mem_if);
+ desc->lli.ctrlb = FIELD_PREP(ATC_DST_ADDR_MODE,
+ ATC_DST_ADDR_MODE_INCR) |
+ FIELD_PREP(ATC_SRC_ADDR_MODE,
+ ATC_SRC_ADDR_MODE_FIXED) |
+ FIELD_PREP(ATC_FC, ATC_FC_PER2MEM) |
+ FIELD_PREP(ATC_SIF, atchan->per_if) |
+ FIELD_PREP(ATC_DIF, atchan->mem_if);
desc->len = period_len;
break;
@@ -2144,14 +2133,13 @@ static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec,
return NULL;
}
- atslave->cfg = ATC_DST_H2SEL_HW | ATC_SRC_H2SEL_HW;
+ atslave->cfg = ATC_DST_H2SEL | ATC_SRC_H2SEL;
/*
* We can fill both SRC_PER and DST_PER, one of these fields will be
* ignored depending on DMA transfer direction.
*/
per_id = dma_spec->args[1] & AT91_DMA_CFG_PER_ID_MASK;
- atslave->cfg |= ATC_DST_PER_MSB(per_id) | ATC_DST_PER(per_id)
- | ATC_SRC_PER_MSB(per_id) | ATC_SRC_PER(per_id);
+ atslave->cfg |= ATC_DST_PER_ID(per_id) | ATC_SRC_PER_ID(per_id);
/*
* We have to translate the value we get from the device tree since
* the half FIFO configuration value had to be 0 to keep backward
@@ -2159,14 +2147,16 @@ static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec,
*/
switch (dma_spec->args[1] & AT91_DMA_CFG_FIFOCFG_MASK) {
case AT91_DMA_CFG_FIFOCFG_ALAP:
- atslave->cfg |= ATC_FIFOCFG_LARGESTBURST;
+ atslave->cfg |= FIELD_PREP(ATC_FIFOCFG,
+ ATC_FIFOCFG_LARGESTBURST);
break;
case AT91_DMA_CFG_FIFOCFG_ASAP:
- atslave->cfg |= ATC_FIFOCFG_ENOUGHSPACE;
+ atslave->cfg |= FIELD_PREP(ATC_FIFOCFG,
+ ATC_FIFOCFG_ENOUGHSPACE);
break;
case AT91_DMA_CFG_FIFOCFG_HALF:
default:
- atslave->cfg |= ATC_FIFOCFG_HALFFIFO;
+ atslave->cfg |= FIELD_PREP(ATC_FIFOCFG, ATC_FIFOCFG_HALFFIFO);
}
atslave->dma_dev = &dmac_pdev->dev;
Use the bitfield access macros in order to clean and to make the driver easier to read. One will see some "line length exceeds 100 columns" checkpatch warnings. I chose to not introduce new lines for regs descriptions in order to preserve the style of the comments throughout the definitions. Style can be fixed in a further patch. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> --- drivers/dma/at_hdmac.c | 406 ++++++++++++++++++++--------------------- 1 file changed, 198 insertions(+), 208 deletions(-)