[00717a3] | 1 | /* MCF5206e MBUS module (I2C bus) driver |
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| 2 | * |
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| 3 | * Copyright (C) 2000 OKTET Ltd., St.-Petersburg, Russia |
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| 4 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
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| 5 | * |
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| 6 | * The license and distribution terms for this file may be |
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| 7 | * found in the file LICENSE in this distribution or at |
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| 8 | * |
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[57e9580f] | 9 | * http://www.rtems.com/license/LICENSE. |
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[00717a3] | 10 | * |
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| 11 | * @(#) $Id$ |
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| 12 | */ |
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| 13 | |
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| 14 | #include "mcf5206/mcfmbus.h" |
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| 15 | #include "mcf5206/mcf5206e.h" |
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| 16 | #include "i2c.h" |
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| 17 | |
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| 18 | /* Events of I2C machine */ |
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| 19 | typedef enum i2c_event { |
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| 20 | EVENT_NONE, /* Spurious event */ |
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| 21 | EVENT_TRANSFER, /* Start new transfer */ |
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| 22 | EVENT_NEXTMSG, /* Start processing of next message in transfer */ |
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| 23 | EVENT_ACK, /* Sending finished with ACK */ |
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| 24 | EVENT_NACK, /* Sending finished with NACK */ |
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| 25 | EVENT_TIMEOUT, /* Timeout occured */ |
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| 26 | EVENT_DATA_RECV, /* Data received */ |
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| 27 | EVENT_ARB_LOST, /* Arbitration lost */ |
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| 28 | EVENT_SLAVE /* Addressed as a slave */ |
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| 29 | } i2c_event; |
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| 30 | |
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| 31 | static mcfmbus *mbus; |
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| 32 | |
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| 33 | /*** Auxillary primitives ***/ |
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| 34 | |
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| 35 | /* Change state of finite state machine */ |
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| 36 | #define next_state(bus,new_state) \ |
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| 37 | do { \ |
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| 38 | (bus)->state = (new_state); \ |
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| 39 | } while (0) |
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| 40 | |
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| 41 | /* Initiate start condition on the I2C bus */ |
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| 42 | #define mcfmbus_start(bus) \ |
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| 43 | do { \ |
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| 44 | *MCF5206E_MBCR((bus)->base) |= MCF5206E_MBCR_MSTA; \ |
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| 45 | } while (0) |
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| 46 | |
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| 47 | /* Initiate stop condition on the I2C bus */ |
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| 48 | #define mcfmbus_stop(bus) \ |
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| 49 | do { \ |
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| 50 | *MCF5206E_MBCR((bus)->base) &= ~MCF5206E_MBCR_MSTA; \ |
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| 51 | } while (0) |
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| 52 | |
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| 53 | /* Initiate repeat start condition on the I2C bus */ |
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| 54 | #define mcfmbus_rstart(bus) \ |
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| 55 | do { \ |
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| 56 | *MCF5206E_MBCR((bus)->base) |= MCF5206E_MBCR_RSTA; \ |
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| 57 | } while (0) |
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| 58 | |
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| 59 | /* Send byte to the bus */ |
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| 60 | #define mcfmbus_send(bus,byte) \ |
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| 61 | do { \ |
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| 62 | *MCF5206E_MBDR((bus)->base) = (byte); \ |
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| 63 | } while (0) |
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| 64 | |
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| 65 | /* Set transmit mode */ |
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| 66 | #define mcfmbus_tx_mode(bus) \ |
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| 67 | do { \ |
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| 68 | *MCF5206E_MBCR((bus)->base) |= MCF5206E_MBCR_MTX; \ |
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| 69 | } while (0) |
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| 70 | |
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| 71 | /* Set receive mode */ |
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| 72 | #define mcfmbus_rx_mode(bus) \ |
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| 73 | do { \ |
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| 74 | *MCF5206E_MBCR((bus)->base) &= ~MCF5206E_MBCR_MTX; \ |
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| 75 | (void)*MCF5206E_MBDR((bus)->base); \ |
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| 76 | } while (0) |
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| 77 | |
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| 78 | |
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| 79 | /* Transmit acknowledge when byte received */ |
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| 80 | #define mcfmbus_send_ack(bus) \ |
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| 81 | do { \ |
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| 82 | *MCF5206E_MBCR((bus)->base) &= ~MCF5206E_MBCR_TXAK; \ |
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| 83 | } while (0) |
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| 84 | |
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| 85 | /* DO NOT transmit acknowledge when byte received */ |
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| 86 | #define mcfmbus_send_nack(bus) \ |
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| 87 | do { \ |
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| 88 | *MCF5206E_MBCR((bus)->base) |= MCF5206E_MBCR_TXAK; \ |
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| 89 | } while (0) |
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| 90 | |
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| 91 | #define mcfmbus_error(bus,err_status) \ |
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| 92 | do { \ |
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| 93 | do { \ |
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| 94 | (bus)->cmsg->status = (err_status); \ |
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| 95 | (bus)->cmsg++; \ |
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| 96 | } while (((bus)->cmsg - (bus)->msg < (bus)->nmsg) && \ |
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| 97 | ((bus)->cmsg->flags & I2C_MSG_ERRSKIP)); \ |
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| 98 | bus->cmsg--; \ |
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| 99 | } while (0) |
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| 100 | |
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| 101 | /* mcfmbus_get_event -- |
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| 102 | * Read MBUS module status register, determine interrupt reason and |
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| 103 | * return appropriate event. |
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| 104 | * |
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| 105 | * PARAMETERS: |
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| 106 | * bus - pointer to MBUS module descriptor structure |
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| 107 | * |
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| 108 | * RETURNS: |
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| 109 | * event code |
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| 110 | */ |
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| 111 | static i2c_event |
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| 112 | mcfmbus_get_event(mcfmbus *bus) |
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| 113 | { |
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| 114 | i2c_event event; |
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[8bc4430b] | 115 | uint8_t status, control; |
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[00717a3] | 116 | rtems_interrupt_level level; |
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| 117 | rtems_interrupt_disable(level); |
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| 118 | status = *MCF5206E_MBSR(bus->base); |
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| 119 | control = *MCF5206E_MBCR(bus->base); |
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| 120 | if (status & MCF5206E_MBSR_MIF) /* Interrupt occured */ |
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| 121 | { |
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| 122 | if (status & MCF5206E_MBSR_MAAS) |
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| 123 | { |
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| 124 | event = EVENT_SLAVE; |
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| 125 | *MCF5206E_MBCR(bus->base) = control; /* To clear Addressed As Slave |
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| 126 | condition */ |
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| 127 | } |
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| 128 | else if (status & MCF5206E_MBSR_MAL) /* Arbitration lost */ |
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| 129 | { |
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| 130 | *MCF5206E_MBSR(bus->base) = status & ~MCF5206E_MBSR_MAL; |
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| 131 | event = EVENT_ARB_LOST; |
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| 132 | } |
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| 133 | else if (control & MCF5206E_MBCR_MTX) /* Trasmit mode */ |
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| 134 | { |
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| 135 | if (status & MCF5206E_MBSR_RXAK) |
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| 136 | event = EVENT_NACK; |
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| 137 | else |
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| 138 | event = EVENT_ACK; |
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| 139 | } |
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| 140 | else /* Received */ |
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| 141 | { |
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| 142 | event = EVENT_DATA_RECV; |
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| 143 | } |
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| 144 | |
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| 145 | /* Clear interrupt condition */ |
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| 146 | *MCF5206E_MBSR(bus->base) &= ~MCF5206E_MBSR_MIF; |
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| 147 | } |
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| 148 | else |
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| 149 | { |
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| 150 | event = EVENT_NONE; |
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| 151 | } |
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| 152 | rtems_interrupt_enable(level); |
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| 153 | return event; |
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| 154 | } |
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| 155 | |
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| 156 | static void |
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| 157 | mcfmbus_machine_error(mcfmbus *bus, i2c_event event) |
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| 158 | { |
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| 159 | return; |
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| 160 | } |
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| 161 | |
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| 162 | /* mcfmbus_machine -- |
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| 163 | * finite state machine for I2C bus protocol |
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| 164 | * |
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| 165 | * PARAMETERS: |
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| 166 | * bus - pointer to ColdFire MBUS descriptor structure |
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| 167 | * event - I2C event |
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| 168 | * |
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| 169 | * RETURNS: |
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| 170 | * none |
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| 171 | */ |
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| 172 | static void |
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| 173 | mcfmbus_machine(mcfmbus *bus, i2c_event event) |
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| 174 | { |
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[8bc4430b] | 175 | uint8_t b; |
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[00717a3] | 176 | switch (bus->state) |
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| 177 | { |
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| 178 | case STATE_IDLE: |
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| 179 | switch (event) |
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| 180 | { |
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| 181 | case EVENT_NEXTMSG: /* Start new message processing */ |
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| 182 | bus->cmsg++; |
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| 183 | /* FALLTHRU */ |
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| 184 | |
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| 185 | case EVENT_TRANSFER: /* Initiate new transfer */ |
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| 186 | if (bus->cmsg - bus->msg >= bus->nmsg) |
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| 187 | { |
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| 188 | mcfmbus_stop(bus); |
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| 189 | next_state(bus, STATE_IDLE); |
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| 190 | bus->msg = bus->cmsg = NULL; |
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| 191 | bus->nmsg = bus->byte = 0; |
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[95c274e] | 192 | bus->done(bus->done_arg_ptr); |
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[00717a3] | 193 | break; |
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| 194 | } |
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| 195 | |
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| 196 | /* Initiate START or REPEATED START condition on the bus */ |
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| 197 | if (event == EVENT_TRANSFER) |
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| 198 | { |
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| 199 | mcfmbus_start(bus); |
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| 200 | } |
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| 201 | else /* (event == EVENT_NEXTMSG) */ |
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| 202 | { |
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| 203 | mcfmbus_rstart(bus); |
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| 204 | } |
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| 205 | |
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| 206 | bus->byte = 0; |
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| 207 | mcfmbus_tx_mode(bus); |
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| 208 | |
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| 209 | /* Initiate slave address sending */ |
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| 210 | if (bus->cmsg->flags & I2C_MSG_ADDR_10) |
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| 211 | { |
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| 212 | i2c_address a = bus->cmsg->addr; |
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| 213 | b = 0xf0 | (((a >> 8) & 0x03) << 1); |
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| 214 | if (bus->cmsg->flags & I2C_MSG_WR) |
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| 215 | { |
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| 216 | mcfmbus_send(bus, b); |
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| 217 | next_state(bus, STATE_ADDR_1_W); |
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| 218 | } |
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| 219 | else |
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| 220 | { |
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| 221 | mcfmbus_send(bus, b | 1); |
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| 222 | next_state(bus, STATE_ADDR_1_R); |
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| 223 | } |
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| 224 | } |
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| 225 | else |
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| 226 | { |
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| 227 | b = (bus->cmsg->addr & ~0x01); |
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| 228 | |
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| 229 | if (bus->cmsg->flags & I2C_MSG_WR) |
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| 230 | { |
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| 231 | next_state(bus, STATE_SENDING); |
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| 232 | } |
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| 233 | else |
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| 234 | { |
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| 235 | next_state(bus, STATE_ADDR_7); |
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[5bb1a93c] | 236 | b |= 1; |
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[00717a3] | 237 | } |
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[5bb1a93c] | 238 | |
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| 239 | mcfmbus_send(bus, b); |
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[00717a3] | 240 | } |
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| 241 | break; |
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| 242 | |
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| 243 | default: |
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| 244 | mcfmbus_machine_error(bus, event); |
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| 245 | break; |
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| 246 | } |
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| 247 | break; |
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| 248 | |
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| 249 | case STATE_ADDR_7: |
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| 250 | switch (event) |
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| 251 | { |
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| 252 | case EVENT_ACK: |
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| 253 | mcfmbus_rx_mode(bus); |
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| 254 | if (bus->cmsg->len <= 1) |
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| 255 | mcfmbus_send_nack(bus); |
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| 256 | else |
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| 257 | mcfmbus_send_ack(bus); |
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| 258 | next_state(bus, STATE_RECEIVING); |
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| 259 | break; |
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| 260 | |
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| 261 | case EVENT_NACK: |
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| 262 | mcfmbus_error(bus, I2C_NO_DEVICE); |
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| 263 | next_state(bus, STATE_IDLE); |
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| 264 | mcfmbus_machine(bus, EVENT_NEXTMSG); |
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| 265 | break; |
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| 266 | |
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| 267 | case EVENT_ARB_LOST: |
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| 268 | mcfmbus_error(bus, I2C_ARBITRATION_LOST); |
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| 269 | next_state(bus, STATE_IDLE); |
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| 270 | mcfmbus_machine(bus, EVENT_NEXTMSG); |
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| 271 | break; |
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| 272 | |
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| 273 | default: |
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| 274 | mcfmbus_machine_error(bus, event); |
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| 275 | break; |
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| 276 | } |
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| 277 | break; |
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| 278 | |
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| 279 | case STATE_ADDR_1_R: |
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| 280 | case STATE_ADDR_1_W: |
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| 281 | switch (event) |
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| 282 | { |
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| 283 | case EVENT_ACK: |
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| 284 | { |
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[8bc4430b] | 285 | uint8_t b = (bus->cmsg->addr & 0xff); |
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[00717a3] | 286 | mcfmbus_send(bus, b); |
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| 287 | if (bus->state == STATE_ADDR_1_W) |
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| 288 | { |
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| 289 | next_state(bus, STATE_SENDING); |
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| 290 | } |
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| 291 | else |
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| 292 | { |
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| 293 | i2c_address a; |
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| 294 | mcfmbus_rstart(bus); |
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| 295 | mcfmbus_tx_mode(bus); |
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| 296 | a = bus->cmsg->addr; |
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| 297 | b = 0xf0 | (((a >> 8) & 0x03) << 1) | 1; |
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| 298 | mcfmbus_send(bus, b); |
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| 299 | next_state(bus, STATE_ADDR_7); |
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| 300 | } |
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| 301 | break; |
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| 302 | } |
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| 303 | |
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| 304 | case EVENT_NACK: |
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| 305 | mcfmbus_error(bus, I2C_NO_DEVICE); |
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| 306 | next_state(bus, STATE_IDLE); |
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| 307 | mcfmbus_machine(bus, EVENT_NEXTMSG); |
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| 308 | break; |
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| 309 | |
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| 310 | case EVENT_ARB_LOST: |
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| 311 | mcfmbus_error(bus, I2C_ARBITRATION_LOST); |
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| 312 | next_state(bus, STATE_IDLE); |
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| 313 | mcfmbus_machine(bus, EVENT_NEXTMSG); |
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| 314 | break; |
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| 315 | |
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| 316 | default: |
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| 317 | mcfmbus_machine_error(bus, event); |
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| 318 | break; |
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| 319 | } |
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| 320 | break; |
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| 321 | |
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| 322 | case STATE_SENDING: |
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| 323 | switch (event) |
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| 324 | { |
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| 325 | case EVENT_ACK: |
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| 326 | if (bus->byte == bus->cmsg->len) |
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| 327 | { |
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| 328 | next_state(bus, STATE_IDLE); |
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| 329 | mcfmbus_machine(bus, EVENT_NEXTMSG); |
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| 330 | } |
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| 331 | else |
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| 332 | { |
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| 333 | mcfmbus_send(bus, bus->cmsg->buf[bus->byte++]); |
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| 334 | next_state(bus, STATE_SENDING); |
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| 335 | } |
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| 336 | break; |
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| 337 | |
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| 338 | case EVENT_NACK: |
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| 339 | if (bus->byte == 0) |
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| 340 | { |
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| 341 | mcfmbus_error(bus, I2C_NO_DEVICE); |
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| 342 | } |
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| 343 | else |
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| 344 | { |
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| 345 | mcfmbus_error(bus, I2C_NO_ACKNOWLEDGE); |
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| 346 | } |
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| 347 | next_state(bus, STATE_IDLE); |
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| 348 | mcfmbus_machine(bus, EVENT_NEXTMSG); |
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| 349 | break; |
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| 350 | |
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| 351 | case EVENT_ARB_LOST: |
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| 352 | mcfmbus_error(bus, I2C_ARBITRATION_LOST); |
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| 353 | next_state(bus, STATE_IDLE); |
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| 354 | mcfmbus_machine(bus, EVENT_NEXTMSG); |
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| 355 | break; |
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| 356 | |
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| 357 | default: |
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| 358 | mcfmbus_machine_error(bus, event); |
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| 359 | break; |
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| 360 | |
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| 361 | } |
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| 362 | break; |
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| 363 | |
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| 364 | case STATE_RECEIVING: |
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| 365 | switch (event) |
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| 366 | { |
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| 367 | case EVENT_DATA_RECV: |
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| 368 | if (bus->cmsg->len - bus->byte <= 2) |
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| 369 | { |
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| 370 | mcfmbus_send_nack(bus); |
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| 371 | if (bus->cmsg->len - bus->byte <= 1) |
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| 372 | { |
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| 373 | if (bus->cmsg - bus->msg + 1 == bus->nmsg) |
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| 374 | mcfmbus_stop(bus); |
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| 375 | else |
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| 376 | mcfmbus_rstart(bus); |
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| 377 | } |
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| 378 | } |
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| 379 | else |
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| 380 | { |
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| 381 | mcfmbus_send_ack(bus); |
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| 382 | } |
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| 383 | bus->cmsg->buf[bus->byte++] = *MCF5206E_MBDR(bus->base); |
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| 384 | if (bus->cmsg->len == bus->byte) |
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| 385 | { |
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| 386 | next_state(bus,STATE_IDLE); |
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| 387 | mcfmbus_machine(bus, EVENT_NEXTMSG); |
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| 388 | } |
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| 389 | else |
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| 390 | { |
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| 391 | next_state(bus,STATE_RECEIVING); |
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| 392 | } |
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| 393 | break; |
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| 394 | |
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| 395 | case EVENT_ARB_LOST: |
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| 396 | mcfmbus_error(bus, I2C_ARBITRATION_LOST); |
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| 397 | next_state(bus, STATE_IDLE); |
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| 398 | mcfmbus_machine(bus, EVENT_NEXTMSG); |
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| 399 | break; |
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| 400 | |
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| 401 | default: |
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| 402 | mcfmbus_machine_error(bus, event); |
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| 403 | break; |
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| 404 | } |
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| 405 | break; |
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| 406 | } |
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| 407 | } |
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| 408 | |
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| 409 | /* mcfmbus_interrupt_handler -- |
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| 410 | * MBUS module interrupt handler routine |
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| 411 | * |
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| 412 | * PARAMETERS: |
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| 413 | * vector - interrupt vector number (not used) |
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| 414 | * |
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| 415 | * RETURNS: |
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| 416 | * none |
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| 417 | */ |
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| 418 | rtems_isr |
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| 419 | mcfmbus_interrupt_handler(rtems_vector_number vector) |
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| 420 | { |
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| 421 | i2c_event event; |
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| 422 | event = mcfmbus_get_event(mbus); |
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| 423 | mcfmbus_machine(mbus, event); |
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| 424 | } |
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| 425 | |
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| 426 | /* mcfmbus_poll -- |
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| 427 | * MBUS module poll routine; used to poll events when I2C driver |
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| 428 | * operates in poll-driven mode. |
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| 429 | * |
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| 430 | * PARAMETERS: |
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| 431 | * none |
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| 432 | * |
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| 433 | * RETURNS: |
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| 434 | * none |
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| 435 | */ |
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| 436 | void |
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| 437 | mcfmbus_poll(mcfmbus *bus) |
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| 438 | { |
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| 439 | i2c_event event; |
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| 440 | event = mcfmbus_get_event(bus); |
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| 441 | if (event != EVENT_NONE) |
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| 442 | mcfmbus_machine(bus, event); |
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| 443 | } |
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| 444 | |
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| 445 | /* mcfmbus_select_clock_divider -- |
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| 446 | * Select divider for system clock which is used for I2C bus clock |
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| 447 | * generation. Not each divider can be selected for I2C bus; this |
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| 448 | * function select nearest larger or equal divider. |
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| 449 | * |
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| 450 | * PARAMETERS: |
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| 451 | * i2c_bus - pointer to the bus descriptor structure |
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| 452 | * divider - system frequency divider for I2C serial clock. |
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| 453 | * RETURNS: |
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| 454 | * RTEMS_SUCCESSFUL, if operation performed successfully, or |
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| 455 | * RTEMS error code when failed. |
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| 456 | */ |
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| 457 | rtems_status_code |
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| 458 | mcfmbus_select_clock_divider(mcfmbus *i2c_bus, int divider) |
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| 459 | { |
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| 460 | int i; |
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| 461 | int mbc; |
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| 462 | struct { |
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| 463 | int divider; |
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| 464 | int mbc; |
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| 465 | } dividers[] ={ |
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| 466 | { 20, 0x20 }, { 22, 0x21 }, { 24, 0x22 }, { 26, 0x23 }, |
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| 467 | { 28, 0x00 }, { 30, 0x01 }, { 32, 0x25 }, { 34, 0x02 }, |
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| 468 | { 36, 0x26 }, { 40, 0x03 }, { 44, 0x04 }, { 48, 0x05 }, |
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| 469 | { 56, 0x06 }, { 64, 0x2a }, { 68, 0x07 }, { 72, 0x2B }, |
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| 470 | { 80, 0x08 }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A }, |
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| 471 | { 112, 0x2E }, { 128, 0x0B }, { 144, 0x0C }, { 160, 0x0D }, |
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| 472 | { 192, 0x0E }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 }, |
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| 473 | { 288, 0x10 }, { 320, 0x11 }, { 384, 0x12 }, { 448, 0x36 }, |
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| 474 | { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x15 }, |
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| 475 | { 768, 0x16 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B }, |
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| 476 | { 1152, 0x18 }, { 1280, 0x19 }, { 1536, 0x1A }, { 1792, 0x3E }, |
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| 477 | { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D }, |
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| 478 | { 3072, 0x1E }, { 3840, 0x1F } |
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| 479 | }; |
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| 480 | |
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| 481 | if (i2c_bus == NULL) |
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| 482 | return RTEMS_INVALID_ADDRESS; |
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| 483 | |
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| 484 | for (i = 0, mbc = -1; i < sizeof(dividers)/sizeof(dividers[0]); i++) |
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| 485 | { |
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| 486 | mbc = dividers[i].mbc; |
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| 487 | if (dividers[i].divider >= divider) |
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| 488 | { |
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| 489 | break; |
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| 490 | } |
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| 491 | } |
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| 492 | *MCF5206E_MFDR(i2c_bus->base) = mbc; |
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| 493 | return RTEMS_SUCCESSFUL; |
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| 494 | } |
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| 495 | |
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| 496 | /* mcfmbus_initialize -- |
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| 497 | * Initialize ColdFire MBUS I2C bus controller. |
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| 498 | * |
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| 499 | * PARAMETERS: |
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| 500 | * i2c_bus - pointer to the bus descriptor structure |
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| 501 | * base - ColdFire internal peripherial base address |
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| 502 | * |
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| 503 | * RETURNS: |
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| 504 | * RTEMS_SUCCESSFUL, or RTEMS error code when initialization failed. |
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| 505 | */ |
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| 506 | rtems_status_code |
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[8bc4430b] | 507 | mcfmbus_initialize(mcfmbus *i2c_bus, uint32_t base) |
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[00717a3] | 508 | { |
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| 509 | rtems_interrupt_level level; |
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| 510 | rtems_status_code sc; |
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| 511 | |
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| 512 | if (mbus != NULL) /* Check if already initialized */ |
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| 513 | return RTEMS_RESOURCE_IN_USE; |
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| 514 | |
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| 515 | if (i2c_bus == NULL) |
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| 516 | return RTEMS_INVALID_ADDRESS; |
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| 517 | |
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| 518 | |
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| 519 | i2c_bus->base = base; |
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| 520 | i2c_bus->state = STATE_IDLE; |
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| 521 | i2c_bus->msg = NULL; |
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| 522 | i2c_bus->cmsg = NULL; |
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| 523 | i2c_bus->nmsg = 0; |
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| 524 | i2c_bus->byte = 0; |
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| 525 | |
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| 526 | sc = rtems_interrupt_catch( |
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| 527 | mcfmbus_interrupt_handler, |
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| 528 | 24 + ((*MCF5206E_ICR(base, MCF5206E_INTR_MBUS) & MCF5206E_ICR_IL) >> |
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| 529 | MCF5206E_ICR_IL_S), |
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| 530 | &i2c_bus->oldisr |
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| 531 | ); |
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| 532 | if (sc != RTEMS_SUCCESSFUL) |
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| 533 | return sc; |
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| 534 | |
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| 535 | mbus = i2c_bus; |
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| 536 | rtems_interrupt_disable(level); |
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| 537 | *MCF5206E_IMR(base) &= ~MCF5206E_INTR_BIT(MCF5206E_INTR_MBUS); |
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| 538 | *MCF5206E_MBCR(base) = 0; |
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| 539 | *MCF5206E_MBSR(base) = 0; |
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| 540 | *MCF5206E_MBDR(base) = 0x1F; /* Maximum possible divider is 3840 */ |
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| 541 | *MCF5206E_MBCR(base) = MCF5206E_MBCR_MEN | MCF5206E_MBCR_MIEN; |
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| 542 | rtems_interrupt_enable(level); |
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| 543 | |
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| 544 | return RTEMS_SUCCESSFUL; |
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| 545 | } |
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| 546 | |
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| 547 | /* mcfmbus_i2c_transfer -- |
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| 548 | * Initiate multiple-messages transfer over I2C bus via ColdFire MBUS |
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| 549 | * controller. |
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| 550 | * |
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| 551 | * PARAMETERS: |
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| 552 | * bus - pointer to MBUS controller descriptor |
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| 553 | * nmsg - number of messages |
---|
| 554 | * msg - pointer to messages array |
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| 555 | * done - function which is called when transfer is finished |
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[95c274e] | 556 | * done_arg_ptr - arbitrary argument ptr passed to done funciton |
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[00717a3] | 557 | * |
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| 558 | * RETURNS: |
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| 559 | * RTEMS_SUCCESSFUL if transfer initiated successfully, or error |
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| 560 | * code when failed. |
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| 561 | */ |
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| 562 | rtems_status_code |
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| 563 | mcfmbus_i2c_transfer(mcfmbus *bus, int nmsg, i2c_message *msg, |
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[95c274e] | 564 | i2c_transfer_done done, void *done_arg_ptr) |
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[00717a3] | 565 | { |
---|
| 566 | if (bus != mbus) |
---|
| 567 | return RTEMS_NOT_CONFIGURED; |
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| 568 | |
---|
| 569 | bus->done = done; |
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[95c274e] | 570 | bus->done_arg_ptr = done_arg_ptr; |
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[00717a3] | 571 | bus->cmsg = bus->msg = msg; |
---|
| 572 | bus->nmsg = nmsg; |
---|
| 573 | bus->byte = 0; |
---|
| 574 | bus->state = STATE_IDLE; |
---|
| 575 | mcfmbus_machine(bus, EVENT_TRANSFER); |
---|
| 576 | return RTEMS_SUCCESSFUL; |
---|
| 577 | } |
---|
| 578 | |
---|
| 579 | |
---|
| 580 | /* mcfmbus_i2c_done -- |
---|
| 581 | * Close ColdFire MBUS I2C bus controller and release all resources. |
---|
| 582 | * |
---|
| 583 | * PARAMETERS: |
---|
| 584 | * bus - pointer to MBUS controller descriptor |
---|
| 585 | * |
---|
| 586 | * RETURNS: |
---|
| 587 | * RTEMS_SUCCESSFUL, if transfer initiated successfully, or error |
---|
| 588 | * code when failed. |
---|
| 589 | */ |
---|
| 590 | rtems_status_code |
---|
| 591 | mcfmbus_i2c_done(mcfmbus *i2c_bus) |
---|
| 592 | { |
---|
| 593 | rtems_status_code sc; |
---|
[8bc4430b] | 594 | uint32_t base; |
---|
[00717a3] | 595 | if (mbus == NULL) |
---|
| 596 | return RTEMS_NOT_CONFIGURED; |
---|
| 597 | |
---|
| 598 | if (mbus != i2c_bus) |
---|
| 599 | return RTEMS_INVALID_ADDRESS; |
---|
| 600 | |
---|
| 601 | base = i2c_bus->base; |
---|
| 602 | |
---|
| 603 | *MCF5206E_IMR(base) |= MCF5206E_INTR_BIT(MCF5206E_INTR_MBUS); |
---|
| 604 | *MCF5206E_MBCR(base) = 0; |
---|
| 605 | |
---|
| 606 | sc = rtems_interrupt_catch( |
---|
| 607 | i2c_bus->oldisr, |
---|
| 608 | 24 + ((*MCF5206E_ICR(base, MCF5206E_INTR_MBUS) & MCF5206E_ICR_IL) >> |
---|
| 609 | MCF5206E_ICR_IL_S), |
---|
| 610 | NULL |
---|
| 611 | ); |
---|
| 612 | return sc; |
---|
| 613 | } |
---|