FreeCalypso > hg > freecalypso-tools

annotate target-utils/c139explore/uwire.c @ 988:5a6019ed7e72

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pln-ppb-test: implement read-id
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 03 Dec 2023 00:04:18 +0000
parents e7502631a0f9
children
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1 /* Driver for uWire Master Controller inside TI Calypso */
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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 Sylvain Munaut <tnt@246tNt.com>
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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
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26 struct uwire_regs {
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27 u16 reg_data;
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28 u16 reg_csr;
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29 u16 reg_sr1;
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30 u16 reg_sr2;
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31 u16 reg_sr3;
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32 };
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33
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34 #define UWIRE_REGS (*(volatile struct uwire_regs *) 0xFFFE4000)
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35
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36 #define UWIRE_CSR_BITS_RD(n) (((n) & 0x1f) << 0)
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37 #define UWIRE_CSR_BITS_WR(n) (((n) & 0x1f) << 5)
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38 #define UWIRE_CSR_IDX(n) (((n) & 3) << 10)
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39 #define UWIRE_CSR_CS_CMD (1 << 12)
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40 #define UWIRE_CSR_START (1 << 13)
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41 #define UWIRE_CSR_CSRB (1 << 14)
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42 #define UWIRE_CSR_RDRB (1 << 15)
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43
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44 #define UWIRE_CSn_EDGE_RD (1 << 0) /* 1=falling 0=rising */
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45 #define UWIRE_CSn_EDGE_WR (1 << 1) /* 1=falling 0=rising */
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46 #define UWIRE_CSn_CS_LVL (1 << 2)
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47 #define UWIRE_CSn_FRQ_DIV2 (0 << 3)
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48 #define UWIRE_CSn_FRQ_DIV4 (1 << 3)
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49 #define UWIRE_CSn_FRQ_DIV8 (2 << 3)
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50 #define UWIRE_CSn_CKH
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51
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52 #define UWIRE_CSn_SHIFT(n) (((n) & 1) ? 6 : 0)
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53 #define UWIRE_CSn_REG(n) (((n) & 2) ? REG_SR2 : REG_SR1)
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54
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55 #define UWIRE_SR3_CLK_EN (1 << 0)
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56 #define UWIRE_SR3_CLK_DIV2 (0 << 1)
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57 #define UWIRE_SR3_CLK_DIV4 (1 << 1)
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58 #define UWIRE_SR3_CLK_DIV7 (2 << 1)
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59 #define UWIRE_SR3_CLK_DIV10 (3 << 1)
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60
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61 static inline void _uwire_wait(int mask, int val)
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62 {
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63 while ((UWIRE_REGS.reg_csr & mask) != val);
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64 }
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65
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66 /*
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67 * Let's try changing the chip select logic from OsmocomBB way
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68 * to the way seen in TI's R2D source.
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69 */
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70
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71 void uwire_init(void)
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72 {
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73 UWIRE_REGS.reg_sr3 = UWIRE_SR3_CLK_EN | UWIRE_SR3_CLK_DIV2;
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74 UWIRE_REGS.reg_sr1 = UWIRE_CSn_FRQ_DIV2;
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75 #if 0
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76 UWIRE_REGS.reg_sr1 = UWIRE_CSn_CS_LVL | UWIRE_CSn_FRQ_DIV2;
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77 UWIRE_REGS.reg_csr = UWIRE_CSR_IDX(0) | UWIRE_CSR_CS_CMD;
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78 _uwire_wait(UWIRE_CSR_CSRB, 0);
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79 #endif
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80 }
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81
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82 send_via_uwire(word)
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83 unsigned word;
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84 {
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85 #if 0
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86 /* select the chip */
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87 UWIRE_REGS.reg_csr = UWIRE_CSR_IDX(0) | UWIRE_CSR_CS_CMD;
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88 _uwire_wait(UWIRE_CSR_CSRB, 0);
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89 #endif
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90
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91 UWIRE_REGS.reg_data = word << 7;
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92 UWIRE_REGS.reg_csr = UWIRE_CSR_BITS_WR(9) | UWIRE_CSR_START
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93 | UWIRE_CSR_CS_CMD;
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94 _uwire_wait(UWIRE_CSR_CSRB, 0);
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95
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96 /* unselect the chip */
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97 UWIRE_REGS.reg_csr = UWIRE_CSR_IDX(0) | 0;
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98 #if 0
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99 _uwire_wait(UWIRE_CSR_CSRB, 0);
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100 #endif
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101
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102 return 0;
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103 }