forked from luck/tmp_suning_uos_patched
69b921acae
The MPC8309 has a dedicated signal, SPISEL_BOOT, usually used as chip select for the flash device from which the bootloader is loaded. It is not an ordinary gpio, but is simply controlled via the SPI_CS register in the system configuration. To allow accessing such a spi slave, we need to teach fsl_spi_cs_control() how to control the SPISEL_BOOT signal. To distinguish the gpio-controlled slaves, continue to have those use chip_select values of 0..ngpios-1, and use chip_select == ngpios for the boot flash. I'm not too happy with all the ifdeffery, but it seems to be necessary for guarding the sysdev/fsl_soc.h and use of get_immrbase() (spi-fsl-lib.c already contains similar ifdeffery). Googling suggests that the MPC8306 is similar, with the SPI_CS register at the same offset. Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Signed-off-by: Mark Brown <broonie@kernel.org>
122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/*
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* Freescale SPI/eSPI controller driver library.
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*
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* Maintainer: Kumar Gala
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*
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* Copyright 2010 Freescale Semiconductor, Inc.
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* Copyright (C) 2006 Polycom, Inc.
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*
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* CPM SPI and QE buffer descriptors mode support:
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* Copyright (c) 2009 MontaVista Software, Inc.
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef __SPI_FSL_LIB_H__
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#define __SPI_FSL_LIB_H__
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#include <asm/io.h>
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/* SPI/eSPI Controller driver's private data. */
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struct mpc8xxx_spi {
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struct device *dev;
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void __iomem *reg_base;
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/* rx & tx bufs from the spi_transfer */
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const void *tx;
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void *rx;
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int subblock;
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struct spi_pram __iomem *pram;
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#ifdef CONFIG_FSL_SOC
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struct cpm_buf_desc __iomem *tx_bd;
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struct cpm_buf_desc __iomem *rx_bd;
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#endif
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struct spi_transfer *xfer_in_progress;
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/* dma addresses for CPM transfers */
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dma_addr_t tx_dma;
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dma_addr_t rx_dma;
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bool map_tx_dma;
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bool map_rx_dma;
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dma_addr_t dma_dummy_tx;
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dma_addr_t dma_dummy_rx;
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/* functions to deal with different sized buffers */
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void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
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u32(*get_tx) (struct mpc8xxx_spi *);
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unsigned int count;
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unsigned int irq;
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unsigned nsecs; /* (clock cycle time)/2 */
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u32 spibrg; /* SPIBRG input clock */
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u32 rx_shift; /* RX data reg shift when in qe mode */
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u32 tx_shift; /* TX data reg shift when in qe mode */
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unsigned int flags;
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#if IS_ENABLED(CONFIG_SPI_FSL_SPI)
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int type;
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int native_chipselects;
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u8 max_bits_per_word;
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void (*set_shifts)(u32 *rx_shift, u32 *tx_shift,
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int bits_per_word, int msb_first);
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#endif
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struct completion done;
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};
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struct spi_mpc8xxx_cs {
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/* functions to deal with different sized buffers */
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void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
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u32 (*get_tx) (struct mpc8xxx_spi *);
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u32 rx_shift; /* RX data reg shift when in qe mode */
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u32 tx_shift; /* TX data reg shift when in qe mode */
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u32 hw_mode; /* Holds HW mode register settings */
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};
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static inline void mpc8xxx_spi_write_reg(__be32 __iomem *reg, u32 val)
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{
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iowrite32be(val, reg);
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}
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static inline u32 mpc8xxx_spi_read_reg(__be32 __iomem *reg)
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{
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return ioread32be(reg);
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}
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struct mpc8xxx_spi_probe_info {
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struct fsl_spi_platform_data pdata;
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int ngpios;
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int *gpios;
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bool *alow_flags;
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__be32 __iomem *immr_spi_cs;
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};
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extern u32 mpc8xxx_spi_tx_buf_u8(struct mpc8xxx_spi *mpc8xxx_spi);
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extern u32 mpc8xxx_spi_tx_buf_u16(struct mpc8xxx_spi *mpc8xxx_spi);
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extern u32 mpc8xxx_spi_tx_buf_u32(struct mpc8xxx_spi *mpc8xxx_spi);
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extern void mpc8xxx_spi_rx_buf_u8(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
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extern void mpc8xxx_spi_rx_buf_u16(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
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extern void mpc8xxx_spi_rx_buf_u32(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
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extern struct mpc8xxx_spi_probe_info *to_of_pinfo(
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struct fsl_spi_platform_data *pdata);
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extern int mpc8xxx_spi_bufs(struct mpc8xxx_spi *mspi,
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struct spi_transfer *t, unsigned int len);
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extern const char *mpc8xxx_spi_strmode(unsigned int flags);
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extern void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
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unsigned int irq);
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extern int mpc8xxx_spi_remove(struct device *dev);
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extern int of_mpc8xxx_spi_probe(struct platform_device *ofdev);
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#endif /* __SPI_FSL_LIB_H__ */
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