include/linux/spi/pxa2xx_spi.h

   1 /*
   2  * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18 #ifndef __linux_pxa2xx_spi_h
  19 #define __linux_pxa2xx_spi_h
  20
  21 #include <linux/pxa2xx_ssp.h>
  22
  23 #define PXA2XX_CS_ASSERT (0x01)
  24 #define PXA2XX_CS_DEASSERT (0x02)
  25
  26 /* device.platform_data for SSP controller devices */
  27 struct pxa2xx_spi_master {
  28         u32 clock_enable;
  29         u16 num_chipselect;
  30         u8 enable_dma;
  31 };
  32
  33 /* spi_board_info.controller_data for SPI slave devices,
  34  * copied to spi_device.platform_data ... mostly for dma tuning
  35  */
  36 struct pxa2xx_spi_chip {
  37         u8 tx_threshold;
  38         u8 rx_threshold;
  39         u8 dma_burst_size;
  40         u32 timeout;
  41         u8 enable_loopback;
  42         int gpio_cs;
  43         void (*cs_control)(u32 command);
  44 };
  45
  46 #ifdef CONFIG_ARCH_PXA
  47
  48 #include <linux/clk.h>
  49 #include <mach/dma.h>
  50
  51 extern void pxa2xx_set_spi_info(unsigned id, struct pxa2xx_spi_master *info);
  52
  53 #else
  54 /*
  55  * This is the implemtation for CE4100 on x86. ARM defines them in mach/ or
  56  * plat/ include path.
  57  * The CE4100 does not provide DMA support. This bits are here to let the driver
  58  * compile and will never be used. Maybe we get DMA support at a later point in
  59  * time.
  60  */
  61
  62 #define DCSR(n)         (n)
  63 #define DSADR(n)        (n)
  64 #define DTADR(n)        (n)
  65 #define DCMD(n)         (n)
  66 #define DRCMR(n)        (n)
  67
  68 #define DCSR_RUN        (1 << 31)       /* Run Bit */
  69 #define DCSR_NODESC     (1 << 30)       /* No-Descriptor Fetch */
  70 #define DCSR_STOPIRQEN  (1 << 29)       /* Stop Interrupt Enable */
  71 #define DCSR_REQPEND    (1 << 8)        /* Request Pending (read-only) */
  72 #define DCSR_STOPSTATE  (1 << 3)        /* Stop State (read-only) */
  73 #define DCSR_ENDINTR    (1 << 2)        /* End Interrupt */
  74 #define DCSR_STARTINTR  (1 << 1)        /* Start Interrupt */
  75 #define DCSR_BUSERR     (1 << 0)        /* Bus Error Interrupt */
  76
  77 #define DCSR_EORIRQEN   (1 << 28)       /* End of Receive Interrupt Enable */
  78 #define DCSR_EORJMPEN   (1 << 27)       /* Jump to next descriptor on EOR */
  79 #define DCSR_EORSTOPEN  (1 << 26)       /* STOP on an EOR */
  80 #define DCSR_SETCMPST   (1 << 25)       /* Set Descriptor Compare Status */
  81 #define DCSR_CLRCMPST   (1 << 24)       /* Clear Descriptor Compare Status */
  82 #define DCSR_CMPST      (1 << 10)       /* The Descriptor Compare Status */
  83 #define DCSR_EORINTR    (1 << 9)        /* The end of Receive */
  84
  85 #define DRCMR_MAPVLD    (1 << 7)        /* Map Valid */
  86 #define DRCMR_CHLNUM    0x1f            /* mask for Channel Number */
  87
  88 #define DDADR_DESCADDR  0xfffffff0      /* Address of next descriptor */
  89 #define DDADR_STOP      (1 << 0)        /* Stop */
  90
  91 #define DCMD_INCSRCADDR (1 << 31)       /* Source Address Increment Setting. */
  92 #define DCMD_INCTRGADDR (1 << 30)       /* Target Address Increment Setting. */
  93 #define DCMD_FLOWSRC    (1 << 29)       /* Flow Control by the source. */
  94 #define DCMD_FLOWTRG    (1 << 28)       /* Flow Control by the target. */
  95 #define DCMD_STARTIRQEN (1 << 22)       /* Start Interrupt Enable */
  96 #define DCMD_ENDIRQEN   (1 << 21)       /* End Interrupt Enable */
  97 #define DCMD_ENDIAN     (1 << 18)       /* Device Endian-ness. */
  98 #define DCMD_BURST8     (1 << 16)       /* 8 byte burst */
  99 #define DCMD_BURST16    (2 << 16)       /* 16 byte burst */
 100 #define DCMD_BURST32    (3 << 16)       /* 32 byte burst */
 101 #define DCMD_WIDTH1     (1 << 14)       /* 1 byte width */
 102 #define DCMD_WIDTH2     (2 << 14)       /* 2 byte width (HalfWord) */
 103 #define DCMD_WIDTH4     (3 << 14)       /* 4 byte width (Word) */
 104 #define DCMD_LENGTH     0x01fff         /* length mask (max = 8K - 1) */
 105
 106 /*
 107  * Descriptor structure for PXA's DMA engine
 108  * Note: this structure must always be aligned to a 16-byte boundary.
 109  */
 110
 111 typedef enum {
 112         DMA_PRIO_HIGH = 0,
 113         DMA_PRIO_MEDIUM = 1,
 114         DMA_PRIO_LOW = 2
 115 } pxa_dma_prio;
 116
 117 /*
 118  * DMA registration
 119  */
 120
 121 static inline int pxa_request_dma(char *name,
 122                 pxa_dma_prio prio,
 123                 void (*irq_handler)(int, void *),
 124                 void *data)
 125 {
 126         return -ENODEV;
 127 }
 128
 129 static inline void pxa_free_dma(int dma_ch)
 130 {
 131 }
 132
 133 /*
 134  * The CE4100 does not have the clk framework implemented and SPI clock can
 135  * not be switched on/off or the divider changed.
 136  */
 137 static inline void clk_disable(struct clk *clk)
 138 {
 139 }
 140
 141 static inline int clk_enable(struct clk *clk)
 142 {
 143         return 0;
 144 }
 145
 146 static inline unsigned long clk_get_rate(struct clk *clk)
 147 {
 148         return 3686400;
 149 }
 150
 151 #endif
 152 #endif