FreeCalypso > hg > freecalypso-tools
annotate target-utils/libbase/abbdrv.c @ 763:4eaad91f4d68
CHANGES: document rvinterf -b PID addition
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 02 Dec 2020 20:32:02 +0000 |
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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) |
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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); |
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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: |
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75 abb_reg_write(PAGEREG, 1 << 0); |
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76 break; |
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77 case 1: |
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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 } |
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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); |
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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); |
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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 |
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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 } |