FreeCalypso > hg > freecalypso-tools

annotate target-utils/libbase/abbdrv.c @ 904:5041bcb8140f

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tchtools/fc-vm2hex.c: update header comment for new situation
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 28 Dec 2022 08:41:57 +0000
parents a04a145098f1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Driver for Analog Baseband Circuit (TWL3025) */
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2 /* lifted from OsmocomBB and ported to FreeCalypso target-utils environment */
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3
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4 /* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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5 *
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6 * All Rights Reserved
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7 *
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8 * This program is free software; you can redistribute it and/or modify
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9 * it under the terms of the GNU General Public License as published by
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10 * the Free Software Foundation; either version 2 of the License, or
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11 * (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 * GNU General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU General Public License along
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19 * with this program; if not, write to the Free Software Foundation, Inc.,
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20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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21 *
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22 */
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23
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24 #include "types.h"
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25 #include "abbdefs.h"
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26
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27 /* TWL3025, modified for page 2 support */
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28 #define REG_PAGE(n) ((n) >> 6)
0
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29 #define REG_ADDR(n) ((n) & 0x1f)
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30
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31 #define TWL3025_DEV_IDX 0 /* On the SPI bus */
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32 #define TWL3025_TSP_DEV_IDX 0 /* On the TSP bus */
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33
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34 int abb_state_initdone, abb_state_page;
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35
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36 void
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37 abb_reg_write(reg, data)
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38 {
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39 u16 tx;
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40
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41 if (reg != PAGEREG && REG_PAGE(reg) != abb_state_page)
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42 abb_select_page(REG_PAGE(reg));
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43
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44 tx = ((data & 0x3ff) << 6) | (REG_ADDR(reg) << 1);
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45
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46 spi_xfer(TWL3025_DEV_IDX, 16, &tx, 0);
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47 }
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48
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49 u16
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50 abb_reg_read(reg)
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51 {
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52 u16 tx, rx;
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53
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54 if (REG_PAGE(reg) != abb_state_page)
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55 abb_select_page(REG_PAGE(reg));
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56
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57 tx = (REG_ADDR(reg) << 1) | 1;
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58
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59 /* A read cycle contains two SPI transfers */
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60 spi_xfer(TWL3025_DEV_IDX, 16, &tx, &rx);
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61 /* delay of seven 13MHz cycles */
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62 wait_ARM_cycles(7);
0
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63 spi_xfer(TWL3025_DEV_IDX, 16, &tx, &rx);
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64
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65 rx >>= 6;
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66
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67 return rx;
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68 }
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69
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70 /* Switch the register page of the TWL3025 */
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71 abb_select_page(page)
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72 {
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73 switch (page) {
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74 case 0:
0
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75 abb_reg_write(PAGEREG, 1 << 0);
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76 break;
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77 case 1:
0
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78 abb_reg_write(PAGEREG, 1 << 1);
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79 break;
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80 case 2:
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81 /* not documented in datasheet, learned from TCS211 code */
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82 abb_reg_write(PAGEREG, 1 << 4);
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83 break;
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84 }
0
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85 abb_state_page = page;
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86 return(0);
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87 }
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88
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89 abb_init()
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90 {
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91 if (abb_state_initdone)
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92 return(0);
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93 spi_init();
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94 abb_select_page(0);
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95 /* CLK13M enable */
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96 abb_reg_write(TOGBR2, TOGBR2_ACTS);
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97 /* ABB_Wait_IBIC_Access() delay of 210 us */
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98 wait_ARM_cycles(210 * 13);
0
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99 /* for whatever reason we need to do this twice */
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100 abb_reg_write(TOGBR2, TOGBR2_ACTS);
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101 /* ABB_Wait_IBIC_Access() delay of 210 us */
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102 wait_ARM_cycles(210 * 13);
0
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103 abb_state_initdone = 1;
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104 return(1);
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105 }
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106
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107 void
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108 abb_unlock_page2()
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109 {
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110 abb_reg_write(TAPCTRL, 0x01);
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111 abb_reg_write(TAPREG, 0x1B);
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112 }
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113
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114 void
0
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115 abb_power_off()
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116 {
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117 abb_init();
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118 /*
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119 * If we booted via nTESTRESET, we need to clean up some state
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120 * in a secret undocumented Iota register before we do the DEVOFF,
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121 * otherwise subsequent switch-on via regular PWON button
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122 * won't work correctly.
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123 */
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124 abb_unlock_page2();
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125 abb_reg_write(VRPCAUX, 0x07);
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126 serial_flush();
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127 abb_reg_write(VRPCDEV, 0x01); /* DEVOFF */
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128 /*
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129 * TWL3025 datasheet seems to indicate that the time for the DEVOFF
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130 * command to take effect is 5 cycles of the 32.768 kHz clock.
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131 * We'll do an ARM-timed delay of 10 ms before returning from
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132 * this function.
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133 */
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134 wait_ARM_cycles(13000 * 10);
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135 }