1 /* 2 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs 3 * Copyright (C) 2013, Intel Corporation 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #ifndef SPI_PXA2XX_H 11 #define SPI_PXA2XX_H 12 13 #include <linux/atomic.h> 14 #include <linux/dmaengine.h> 15 #include <linux/errno.h> 16 #include <linux/io.h> 17 #include <linux/interrupt.h> 18 #include <linux/platform_device.h> 19 #include <linux/pxa2xx_ssp.h> 20 #include <linux/scatterlist.h> 21 #include <linux/sizes.h> 22 #include <linux/spi/spi.h> 23 #include <linux/spi/pxa2xx_spi.h> 24 25 struct driver_data { 26 /* Driver model hookup */ 27 struct platform_device *pdev; 28 29 /* SSP Info */ 30 struct ssp_device *ssp; 31 32 /* SPI framework hookup */ 33 enum pxa_ssp_type ssp_type; 34 struct spi_controller *master; 35 36 /* PXA hookup */ 37 struct pxa2xx_spi_master *master_info; 38 39 /* SSP register addresses */ 40 void __iomem *ioaddr; 41 phys_addr_t ssdr_physical; 42 43 /* SSP masks*/ 44 u32 dma_cr1; 45 u32 int_cr1; 46 u32 clear_sr; 47 u32 mask_sr; 48 49 /* DMA engine support */ 50 atomic_t dma_running; 51 52 /* Current transfer state info */ 53 void *tx; 54 void *tx_end; 55 void *rx; 56 void *rx_end; 57 u8 n_bytes; 58 int (*write)(struct driver_data *drv_data); 59 int (*read)(struct driver_data *drv_data); 60 irqreturn_t (*transfer_handler)(struct driver_data *drv_data); 61 void (*cs_control)(u32 command); 62 63 void __iomem *lpss_base; 64 65 /* GPIOs for chip selects */ 66 struct gpio_desc **cs_gpiods; 67 }; 68 69 struct chip_data { 70 u32 cr1; 71 u32 dds_rate; 72 u32 timeout; 73 u8 n_bytes; 74 u32 dma_burst_size; 75 u32 threshold; 76 u32 dma_threshold; 77 u16 lpss_rx_threshold; 78 u16 lpss_tx_threshold; 79 u8 enable_dma; 80 union { 81 struct gpio_desc *gpiod_cs; 82 unsigned int frm; 83 }; 84 int gpio_cs_inverted; 85 int (*write)(struct driver_data *drv_data); 86 int (*read)(struct driver_data *drv_data); 87 void (*cs_control)(u32 command); 88 }; 89 90 static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data, 91 unsigned reg) 92 { 93 return __raw_readl(drv_data->ioaddr + reg); 94 } 95 96 static inline void pxa2xx_spi_write(const struct driver_data *drv_data, 97 unsigned reg, u32 val) 98 { 99 __raw_writel(val, drv_data->ioaddr + reg); 100 } 101 102 #define DMA_ALIGNMENT 8 103 104 static inline int pxa25x_ssp_comp(struct driver_data *drv_data) 105 { 106 switch (drv_data->ssp_type) { 107 case PXA25x_SSP: 108 case CE4100_SSP: 109 case QUARK_X1000_SSP: 110 return 1; 111 default: 112 return 0; 113 } 114 } 115 116 static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val) 117 { 118 if (drv_data->ssp_type == CE4100_SSP || 119 drv_data->ssp_type == QUARK_X1000_SSP) 120 val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK; 121 122 pxa2xx_spi_write(drv_data, SSSR, val); 123 } 124 125 extern int pxa2xx_spi_flush(struct driver_data *drv_data); 126 127 #define MAX_DMA_LEN SZ_64K 128 #define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL) 129 130 extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data); 131 extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, 132 struct spi_transfer *xfer); 133 extern void pxa2xx_spi_dma_start(struct driver_data *drv_data); 134 extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data); 135 extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data); 136 extern void pxa2xx_spi_dma_release(struct driver_data *drv_data); 137 extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip, 138 struct spi_device *spi, 139 u8 bits_per_word, 140 u32 *burst_code, 141 u32 *threshold); 142 143 #endif /* SPI_PXA2XX_H */ 144