| 1 | /* |
| 2 | * Copyright 1996,2002,2005 Gregory D. Hager, Alfred A. Rizzi, Noah J. Cowan, |
| 3 | * Jason Lapenta, Scott Smedley |
| 4 | * |
| 5 | * This file is part of the DT3155 Device Driver. |
| 6 | * |
| 7 | * The DT3155 Device Driver is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | * |
| 12 | * The DT3155 Device Driver is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
| 15 | * Public License for more details. |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * This file provides some basic register io routines. It is modified from |
| 20 | * demo code provided by Data Translations. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/delay.h> |
| 24 | #include "dt3155.h" |
| 25 | #include "dt3155_io.h" |
| 26 | #include "dt3155_drv.h" |
| 27 | |
| 28 | |
| 29 | /****** local copies of board's 32 bit registers ******/ |
| 30 | u32 even_dma_start_r; /* bit 0 should always be 0 */ |
| 31 | u32 odd_dma_start_r; /* .. */ |
| 32 | u32 even_dma_stride_r; /* bits 0&1 should always be 0 */ |
| 33 | u32 odd_dma_stride_r; /* .. */ |
| 34 | u32 even_pixel_fmt_r; |
| 35 | u32 odd_pixel_fmt_r; |
| 36 | |
| 37 | FIFO_TRIGGER_R fifo_trigger_r; |
| 38 | XFER_MODE_R xfer_mode_r; |
| 39 | CSR1_R csr1_r; |
| 40 | RETRY_WAIT_CNT_R retry_wait_cnt_r; |
| 41 | INT_CSR_R int_csr_r; |
| 42 | |
| 43 | u32 even_fld_mask_r; |
| 44 | u32 odd_fld_mask_r; |
| 45 | |
| 46 | MASK_LENGTH_R mask_length_r; |
| 47 | FIFO_FLAG_CNT_R fifo_flag_cnt_r; |
| 48 | IIC_CLK_DUR_R iic_clk_dur_r; |
| 49 | IIC_CSR1_R iic_csr1_r; |
| 50 | IIC_CSR2_R iic_csr2_r; |
| 51 | DMA_UPPER_LMT_R even_dma_upper_lmt_r; |
| 52 | DMA_UPPER_LMT_R odd_dma_upper_lmt_r; |
| 53 | |
| 54 | |
| 55 | |
| 56 | /******** local copies of board's 8 bit I2C registers ******/ |
| 57 | I2C_CSR2 i2c_csr2; |
| 58 | I2C_EVEN_CSR i2c_even_csr; |
| 59 | I2C_ODD_CSR i2c_odd_csr; |
| 60 | I2C_CONFIG i2c_config; |
| 61 | u8 i2c_dt_id; |
| 62 | u8 i2c_x_clip_start; |
| 63 | u8 i2c_y_clip_start; |
| 64 | u8 i2c_x_clip_end; |
| 65 | u8 i2c_y_clip_end; |
| 66 | u8 i2c_ad_addr; |
| 67 | u8 i2c_ad_lut; |
| 68 | I2C_AD_CMD i2c_ad_cmd; |
| 69 | u8 i2c_dig_out; |
| 70 | u8 i2c_pm_lut_addr; |
| 71 | u8 i2c_pm_lut_data; |
| 72 | |
| 73 | /* |
| 74 | * wait_ibsyclr() |
| 75 | * |
| 76 | * This function handles read/write timing and r/w timeout error |
| 77 | * |
| 78 | * Returns TRUE if NEW_CYCLE clears |
| 79 | * Returns FALSE if NEW_CYCLE doesn't clear in roughly 3 msecs, otherwise |
| 80 | * returns 0 |
| 81 | */ |
| 82 | static int wait_ibsyclr(u8 *lpReg) |
| 83 | { |
| 84 | /* wait 100 microseconds */ |
| 85 | udelay(100L); |
| 86 | /* __delay(loops_per_sec/10000); */ |
| 87 | if (iic_csr2_r.fld.NEW_CYCLE) { |
| 88 | /* if NEW_CYCLE didn't clear */ |
| 89 | /* TIMEOUT ERROR */ |
| 90 | dt3155_errno = DT_ERR_I2C_TIMEOUT; |
| 91 | return FALSE; |
| 92 | } else |
| 93 | return TRUE; /* no error */ |
| 94 | } |
| 95 | |
| 96 | /* |
| 97 | * WriteI2C() |
| 98 | * |
| 99 | * This function handles writing to 8-bit DT3155 registers |
| 100 | * |
| 101 | * 1st parameter is pointer to 32-bit register base address |
| 102 | * 2nd parameter is reg. index; |
| 103 | * 3rd is value to be written |
| 104 | * |
| 105 | * Returns TRUE - Successful completion |
| 106 | * FALSE - Timeout error - cycle did not complete! |
| 107 | */ |
| 108 | int WriteI2C(u8 *lpReg, u_short wIregIndex, u8 byVal) |
| 109 | { |
| 110 | int writestat; /* status for return */ |
| 111 | |
| 112 | /* read 32 bit IIC_CSR2 register data into union */ |
| 113 | |
| 114 | ReadMReg((lpReg + IIC_CSR2), iic_csr2_r.reg); |
| 115 | |
| 116 | /* for write operation */ |
| 117 | iic_csr2_r.fld.DIR_RD = 0; |
| 118 | /* I2C address of I2C register: */ |
| 119 | iic_csr2_r.fld.DIR_ADDR = wIregIndex; |
| 120 | /* 8 bit data to be written to I2C reg */ |
| 121 | iic_csr2_r.fld.DIR_WR_DATA = byVal; |
| 122 | /* will start a direct I2C cycle: */ |
| 123 | iic_csr2_r.fld.NEW_CYCLE = 1; |
| 124 | |
| 125 | /* xfer union data into 32 bit IIC_CSR2 register */ |
| 126 | WriteMReg((lpReg + IIC_CSR2), iic_csr2_r.reg); |
| 127 | |
| 128 | /* wait for IIC cycle to finish */ |
| 129 | writestat = wait_ibsyclr(lpReg); |
| 130 | return writestat; |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * ReadI2C() |
| 135 | * |
| 136 | * This function handles reading from 8-bit DT3155 registers |
| 137 | * |
| 138 | * 1st parameter is pointer to 32-bit register base address |
| 139 | * 2nd parameter is reg. index; |
| 140 | * 3rd is adrs of value to be read |
| 141 | * |
| 142 | * Returns TRUE - Successful completion |
| 143 | * FALSE - Timeout error - cycle did not complete! |
| 144 | */ |
| 145 | int ReadI2C(u8 *lpReg, u_short wIregIndex, u8 *byVal) |
| 146 | { |
| 147 | int writestat; /* status for return */ |
| 148 | |
| 149 | /* read 32 bit IIC_CSR2 register data into union */ |
| 150 | ReadMReg((lpReg + IIC_CSR2), iic_csr2_r.reg); |
| 151 | |
| 152 | /* for read operation */ |
| 153 | iic_csr2_r.fld.DIR_RD = 1; |
| 154 | |
| 155 | /* I2C address of I2C register: */ |
| 156 | iic_csr2_r.fld.DIR_ADDR = wIregIndex; |
| 157 | |
| 158 | /* will start a direct I2C cycle: */ |
| 159 | iic_csr2_r.fld.NEW_CYCLE = 1; |
| 160 | |
| 161 | /* xfer union's data into 32 bit IIC_CSR2 register */ |
| 162 | WriteMReg((lpReg + IIC_CSR2), iic_csr2_r.reg); |
| 163 | |
| 164 | /* wait for IIC cycle to finish */ |
| 165 | writestat = wait_ibsyclr(lpReg); |
| 166 | |
| 167 | /* Next 2 commands read 32 bit IIC_CSR1 register's data into union */ |
| 168 | /* first read data is in IIC_CSR1 */ |
| 169 | ReadMReg((lpReg + IIC_CSR1), iic_csr1_r.reg); |
| 170 | |
| 171 | /* now get data u8 out of register */ |
| 172 | *byVal = (u8) iic_csr1_r.fld.RD_DATA; |
| 173 | |
| 174 | return writestat; |
| 175 | } |