222 lines
5.6 KiB
C
222 lines
5.6 KiB
C
/*
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* Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
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* Copyright (C) 2013, Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef SPI_PXA2XX_H
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#define SPI_PXA2XX_H
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#include <linux/atomic.h>
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#include <linux/dmaengine.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/pxa2xx_ssp.h>
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#include <linux/scatterlist.h>
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#include <linux/sizes.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/pxa2xx_spi.h>
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struct driver_data {
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/* Driver model hookup */
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struct platform_device *pdev;
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/* SSP Info */
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struct ssp_device *ssp;
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/* SPI framework hookup */
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enum pxa_ssp_type ssp_type;
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struct spi_master *master;
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/* PXA hookup */
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struct pxa2xx_spi_master *master_info;
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/* PXA private DMA setup stuff */
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int rx_channel;
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int tx_channel;
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u32 *null_dma_buf;
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/* SSP register addresses */
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void __iomem *ioaddr;
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u32 ssdr_physical;
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/* SSP masks*/
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u32 dma_cr1;
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u32 int_cr1;
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u32 clear_sr;
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u32 mask_sr;
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/* Maximun clock rate */
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unsigned long max_clk_rate;
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/* Message Transfer pump */
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struct tasklet_struct pump_transfers;
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/* DMA engine support */
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struct dma_chan *rx_chan;
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struct dma_chan *tx_chan;
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struct sg_table rx_sgt;
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struct sg_table tx_sgt;
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int rx_nents;
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int tx_nents;
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void *dummy;
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atomic_t dma_running;
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/* Current message transfer state info */
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struct spi_message *cur_msg;
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struct spi_transfer *cur_transfer;
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struct chip_data *cur_chip;
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size_t len;
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void *tx;
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void *tx_end;
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void *rx;
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void *rx_end;
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int dma_mapped;
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dma_addr_t rx_dma;
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dma_addr_t tx_dma;
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size_t rx_map_len;
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size_t tx_map_len;
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u8 n_bytes;
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int (*write)(struct driver_data *drv_data);
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int (*read)(struct driver_data *drv_data);
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irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
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void (*cs_control)(u32 command);
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void __iomem *lpss_base;
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};
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struct chip_data {
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u32 cr0;
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u32 cr1;
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u32 psp;
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u32 timeout;
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u8 n_bytes;
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u32 dma_burst_size;
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u32 threshold;
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u32 dma_threshold;
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u16 lpss_rx_threshold;
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u16 lpss_tx_threshold;
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u8 enable_dma;
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u8 bits_per_word;
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u32 speed_hz;
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union {
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int gpio_cs;
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unsigned int frm;
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};
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int gpio_cs_inverted;
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int (*write)(struct driver_data *drv_data);
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int (*read)(struct driver_data *drv_data);
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void (*cs_control)(u32 command);
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};
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#define DEFINE_SSP_REG(reg, off) \
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static inline u32 read_##reg(void const __iomem *p) \
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{ return __raw_readl(p + (off)); } \
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\
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static inline void write_##reg(u32 v, void __iomem *p) \
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{ __raw_writel(v, p + (off)); }
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DEFINE_SSP_REG(SSCR0, 0x00)
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DEFINE_SSP_REG(SSCR1, 0x04)
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DEFINE_SSP_REG(SSSR, 0x08)
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DEFINE_SSP_REG(SSITR, 0x0c)
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DEFINE_SSP_REG(SSDR, 0x10)
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DEFINE_SSP_REG(SSTO, 0x28)
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DEFINE_SSP_REG(SSPSP, 0x2c)
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DEFINE_SSP_REG(SSITF, SSITF)
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DEFINE_SSP_REG(SSIRF, SSIRF)
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#define START_STATE ((void *)0)
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#define RUNNING_STATE ((void *)1)
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#define DONE_STATE ((void *)2)
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#define ERROR_STATE ((void *)-1)
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#define IS_DMA_ALIGNED(x) IS_ALIGNED((unsigned long)(x), DMA_ALIGNMENT)
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#define DMA_ALIGNMENT 8
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static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
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{
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if (drv_data->ssp_type == PXA25x_SSP)
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return 1;
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if (drv_data->ssp_type == CE4100_SSP)
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return 1;
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return 0;
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}
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static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
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{
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void __iomem *reg = drv_data->ioaddr;
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if (drv_data->ssp_type == CE4100_SSP)
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val |= read_SSSR(reg) & SSSR_ALT_FRM_MASK;
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write_SSSR(val, reg);
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}
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extern int pxa2xx_spi_flush(struct driver_data *drv_data);
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extern void *pxa2xx_spi_next_transfer(struct driver_data *drv_data);
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/*
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* Select the right DMA implementation.
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*/
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#if defined(CONFIG_SPI_PXA2XX_PXADMA)
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#define SPI_PXA2XX_USE_DMA 1
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#define MAX_DMA_LEN 8191
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#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TINTE)
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#elif defined(CONFIG_SPI_PXA2XX_DMA)
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#define SPI_PXA2XX_USE_DMA 1
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#define MAX_DMA_LEN SZ_64K
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#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
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#else
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#undef SPI_PXA2XX_USE_DMA
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#define MAX_DMA_LEN 0
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#define DEFAULT_DMA_CR1 0
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#endif
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#ifdef SPI_PXA2XX_USE_DMA
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extern bool pxa2xx_spi_dma_is_possible(size_t len);
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extern int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data);
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extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
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extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst);
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extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
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extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
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extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
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extern void pxa2xx_spi_dma_resume(struct driver_data *drv_data);
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extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
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struct spi_device *spi,
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u8 bits_per_word,
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u32 *burst_code,
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u32 *threshold);
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#else
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static inline bool pxa2xx_spi_dma_is_possible(size_t len) { return false; }
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static inline int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data)
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{
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return 0;
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}
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#define pxa2xx_spi_dma_transfer NULL
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static inline void pxa2xx_spi_dma_prepare(struct driver_data *drv_data,
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u32 dma_burst) {}
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static inline void pxa2xx_spi_dma_start(struct driver_data *drv_data) {}
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static inline int pxa2xx_spi_dma_setup(struct driver_data *drv_data)
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{
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return 0;
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}
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static inline void pxa2xx_spi_dma_release(struct driver_data *drv_data) {}
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static inline void pxa2xx_spi_dma_resume(struct driver_data *drv_data) {}
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static inline int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
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struct spi_device *spi,
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u8 bits_per_word,
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u32 *burst_code,
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u32 *threshold)
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{
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return -ENODEV;
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}
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#endif
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#endif /* SPI_PXA2XX_H */
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