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c4a796329d
Since SPI register access is so expensive, it is worth transferring data a word at a time if we can. This complicates the driver unfortunately. Use the byte-swapping feature to avoid having to convert to/from big endian in software. This change increases speed from about 2MB/s to about 4.5MB/s. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Rajeshwari S Shinde <rajeshwari.s@samsung.com> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
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* (C) Copyright 2012 SAMSUNG Electronics
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* Padmavathi Venna <padma.v@samsung.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __ASM_ARCH_EXYNOS_COMMON_SPI_H_
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#define __ASM_ARCH_EXYNOS_COMMON_SPI_H_
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#ifndef __ASSEMBLY__
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/* SPI peripheral register map; padded to 64KB */
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struct exynos_spi {
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unsigned int ch_cfg; /* 0x00 */
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unsigned char reserved0[4];
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unsigned int mode_cfg; /* 0x08 */
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unsigned int cs_reg; /* 0x0c */
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unsigned char reserved1[4];
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unsigned int spi_sts; /* 0x14 */
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unsigned int tx_data; /* 0x18 */
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unsigned int rx_data; /* 0x1c */
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unsigned int pkt_cnt; /* 0x20 */
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unsigned char reserved2[4];
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unsigned int swap_cfg; /* 0x28 */
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unsigned int fb_clk; /* 0x2c */
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unsigned char padding[0xffd0];
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};
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#define EXYNOS_SPI_MAX_FREQ 50000000
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#define SPI_TIMEOUT_MS 10
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/* SPI_CHCFG */
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#define SPI_CH_HS_EN (1 << 6)
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#define SPI_CH_RST (1 << 5)
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#define SPI_SLAVE_MODE (1 << 4)
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#define SPI_CH_CPOL_L (1 << 3)
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#define SPI_CH_CPHA_B (1 << 2)
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#define SPI_RX_CH_ON (1 << 1)
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#define SPI_TX_CH_ON (1 << 0)
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/* SPI_MODECFG */
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#define SPI_MODE_CH_WIDTH_WORD (0x2 << 29)
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#define SPI_MODE_BUS_WIDTH_WORD (0x2 << 17)
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/* SPI_CSREG */
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#define SPI_SLAVE_SIG_INACT (1 << 0)
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/* SPI_STS */
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#define SPI_ST_TX_DONE (1 << 25)
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#define SPI_FIFO_LVL_MASK 0x1ff
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#define SPI_TX_LVL_OFFSET 6
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#define SPI_RX_LVL_OFFSET 15
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/* Feedback Delay */
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#define SPI_CLK_BYPASS (0 << 0)
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#define SPI_FB_DELAY_90 (1 << 0)
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#define SPI_FB_DELAY_180 (2 << 0)
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#define SPI_FB_DELAY_270 (3 << 0)
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/* Packet Count */
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#define SPI_PACKET_CNT_EN (1 << 16)
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/* Swap config */
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#define SPI_TX_SWAP_EN (1 << 0)
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#define SPI_TX_BYTE_SWAP (1 << 2)
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#define SPI_TX_HWORD_SWAP (1 << 3)
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#define SPI_TX_BYTE_SWAP (1 << 2)
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#define SPI_RX_SWAP_EN (1 << 4)
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#define SPI_RX_BYTE_SWAP (1 << 6)
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#define SPI_RX_HWORD_SWAP (1 << 7)
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#endif /* __ASSEMBLY__ */
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#endif
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