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5753d09b10
Current implementation only supports 8 bit word lengths, even though omap3 can handle anything between 4 and 32. Update the spi interface to support changing the SPI word length, and implement it in omap3_spi driver to support the full range of possible word lengths. This implementation is backwards compatible by defaulting to the old behavior of 8 bit word lengths. Also, it required a change to the omap3_spi non static I/O functions, but since they are not used anywhere else, no collateral changes are required. Cc: Tom Rini <trini@ti.com> Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com> Cc: Igor Grinberg <grinberg@compulab.co.il> Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/*
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* Register definitions for the OMAP3 McSPI Controller
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*
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* Copyright (C) 2010 Dirk Behme <dirk.behme@googlemail.com>
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*
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* Parts taken from linux/drivers/spi/omap2_mcspi.c
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* Copyright (C) 2005, 2006 Nokia Corporation
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*
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* Modified by Ruslan Araslanov <ruslan.araslanov@vitecmm.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _OMAP3_SPI_H_
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#define _OMAP3_SPI_H_
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#ifdef CONFIG_AM33XX
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#define OMAP3_MCSPI1_BASE 0x48030100
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#define OMAP3_MCSPI2_BASE 0x481A0100
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#else
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#define OMAP3_MCSPI1_BASE 0x48098000
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#define OMAP3_MCSPI2_BASE 0x4809A000
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#define OMAP3_MCSPI3_BASE 0x480B8000
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#define OMAP3_MCSPI4_BASE 0x480BA000
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#endif
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#define OMAP3_MCSPI_MAX_FREQ 48000000
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/* OMAP3 McSPI registers */
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struct mcspi_channel {
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unsigned int chconf; /* 0x2C, 0x40, 0x54, 0x68 */
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unsigned int chstat; /* 0x30, 0x44, 0x58, 0x6C */
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unsigned int chctrl; /* 0x34, 0x48, 0x5C, 0x70 */
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unsigned int tx; /* 0x38, 0x4C, 0x60, 0x74 */
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unsigned int rx; /* 0x3C, 0x50, 0x64, 0x78 */
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};
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struct mcspi {
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unsigned char res1[0x10];
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unsigned int sysconfig; /* 0x10 */
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unsigned int sysstatus; /* 0x14 */
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unsigned int irqstatus; /* 0x18 */
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unsigned int irqenable; /* 0x1C */
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unsigned int wakeupenable; /* 0x20 */
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unsigned int syst; /* 0x24 */
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unsigned int modulctrl; /* 0x28 */
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struct mcspi_channel channel[4]; /* channel0: 0x2C - 0x3C, bus 0 & 1 & 2 & 3 */
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/* channel1: 0x40 - 0x50, bus 0 & 1 */
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/* channel2: 0x54 - 0x64, bus 0 & 1 */
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/* channel3: 0x68 - 0x78, bus 0 */
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};
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/* per-register bitmasks */
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#define OMAP3_MCSPI_SYSCONFIG_SMARTIDLE (2 << 3)
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#define OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP (1 << 2)
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#define OMAP3_MCSPI_SYSCONFIG_AUTOIDLE (1 << 0)
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#define OMAP3_MCSPI_SYSCONFIG_SOFTRESET (1 << 1)
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#define OMAP3_MCSPI_SYSSTATUS_RESETDONE (1 << 0)
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#define OMAP3_MCSPI_MODULCTRL_SINGLE (1 << 0)
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#define OMAP3_MCSPI_MODULCTRL_MS (1 << 2)
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#define OMAP3_MCSPI_MODULCTRL_STEST (1 << 3)
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#define OMAP3_MCSPI_CHCONF_PHA (1 << 0)
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#define OMAP3_MCSPI_CHCONF_POL (1 << 1)
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#define OMAP3_MCSPI_CHCONF_CLKD_MASK (0x0f << 2)
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#define OMAP3_MCSPI_CHCONF_EPOL (1 << 6)
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#define OMAP3_MCSPI_CHCONF_WL_MASK (0x1f << 7)
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#define OMAP3_MCSPI_CHCONF_TRM_RX_ONLY (0x01 << 12)
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#define OMAP3_MCSPI_CHCONF_TRM_TX_ONLY (0x02 << 12)
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#define OMAP3_MCSPI_CHCONF_TRM_MASK (0x03 << 12)
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#define OMAP3_MCSPI_CHCONF_DMAW (1 << 14)
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#define OMAP3_MCSPI_CHCONF_DMAR (1 << 15)
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#define OMAP3_MCSPI_CHCONF_DPE0 (1 << 16)
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#define OMAP3_MCSPI_CHCONF_DPE1 (1 << 17)
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#define OMAP3_MCSPI_CHCONF_IS (1 << 18)
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#define OMAP3_MCSPI_CHCONF_TURBO (1 << 19)
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#define OMAP3_MCSPI_CHCONF_FORCE (1 << 20)
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#define OMAP3_MCSPI_CHSTAT_RXS (1 << 0)
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#define OMAP3_MCSPI_CHSTAT_TXS (1 << 1)
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#define OMAP3_MCSPI_CHSTAT_EOT (1 << 2)
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#define OMAP3_MCSPI_CHCTRL_EN (1 << 0)
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#define OMAP3_MCSPI_CHCTRL_DIS (0 << 0)
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#define OMAP3_MCSPI_WAKEUPENABLE_WKEN (1 << 0)
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struct omap3_spi_slave {
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struct spi_slave slave;
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struct mcspi *regs;
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unsigned int freq;
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unsigned int mode;
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};
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static inline struct omap3_spi_slave *to_omap3_spi(struct spi_slave *slave)
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{
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return container_of(slave, struct omap3_spi_slave, slave);
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}
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int omap3_spi_txrx(struct spi_slave *slave, unsigned int len, const void *txp,
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void *rxp, unsigned long flags);
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int omap3_spi_write(struct spi_slave *slave, unsigned int len, const void *txp,
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unsigned long flags);
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int omap3_spi_read(struct spi_slave *slave, unsigned int len, void *rxp,
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unsigned long flags);
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#endif /* _OMAP3_SPI_H_ */
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