diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/gen5200/i2c/mpc5200mbus.c')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/gen5200/i2c/mpc5200mbus.c | 673 |
1 files changed, 0 insertions, 673 deletions
diff --git a/c/src/lib/libbsp/powerpc/gen5200/i2c/mpc5200mbus.c b/c/src/lib/libbsp/powerpc/gen5200/i2c/mpc5200mbus.c deleted file mode 100644 index aa926bc8d9..0000000000 --- a/c/src/lib/libbsp/powerpc/gen5200/i2c/mpc5200mbus.c +++ /dev/null @@ -1,673 +0,0 @@ -/*===============================================================*\ -| Project: RTEMS generic MPC5200 BSP | -+-----------------------------------------------------------------+ -| Copyright (c) 2005 | -| Embedded Brains GmbH | -| Obere Lagerstr. 30 | -| D-82178 Puchheim | -| Germany | -| rtems@embedded-brains.de | -+-----------------------------------------------------------------+ -| The license and distribution terms for this file may be | -| found in the file LICENSE in this distribution or at | -| | -| http://www.rtems.org/license/LICENSE. | -| | -+-----------------------------------------------------------------+ -| MBUS module (I2C bus) driver | -+-----------------------------------------------------------------+ -| This file has been adapted from an existing source code file, | -| see the original file header below for reference | -\*===============================================================*/ - -/* MCF5206e MBUS module (I2C bus) driver - * - * Copyright (C) 2000 OKTET Ltd., St.-Petersburg, Russia - * Author: Victor V. Vengerov <vvv@oktet.ru> - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * - * http://www.rtems.org/license/LICENSE. - */ -#include "../i2c/mpc5200mbus.h" -#include <bsp/mpc5200.h> -#include <bsp/irq.h> -#include <bsp/i2c.h> - -/* Events of I2C machine */ -typedef enum i2c_event { - EVENT_NONE, /* Spurious event */ - EVENT_TRANSFER, /* Start new transfer */ - EVENT_NEXTMSG, /* Start processing of next message in transfer */ - EVENT_ACK, /* Sending finished with ACK */ - EVENT_NACK, /* Sending finished with NACK */ - EVENT_TIMEOUT, /* Timeout occured */ - EVENT_DATA_RECV, /* Data received */ - EVENT_ARB_LOST, /* Arbitration lost */ - EVENT_SLAVE /* Addressed as a slave */ -} i2c_event; - -/*** Auxillary primitives ***/ - -/* Change state of finite state machine */ -#define next_state(bus,new_state) \ - do { \ - (bus)->state = (new_state); \ - } while (0) - -/* Initiate start condition on the I2C bus */ -#define mpc5200mbus_start(bus) \ - do { \ - mpc5200.i2c_regs[bus->bus_idx].mcr |= MPC5200_I2C_MCR_MSTA; \ - } while (0) - -/* Initiate stop condition on the I2C bus */ -#define mpc5200mbus_stop(bus) \ - do { \ - mpc5200.i2c_regs[bus->bus_idx].mcr &= ~MPC5200_I2C_MCR_MSTA; \ - } while (0) - -/* Initiate repeat start condition on the I2C bus */ -#define mpc5200mbus_rstart(bus) \ - do { \ - mpc5200.i2c_regs[bus->bus_idx].mcr |= MPC5200_I2C_MCR_RSTA; \ - } while (0) - -/* Send byte to the bus */ -#define mpc5200mbus_send(bus,byte) \ - do { \ - mpc5200.i2c_regs[bus->bus_idx].mdr = (byte); \ - } while (0) - -/* Set transmit mode */ -#define mpc5200mbus_tx_mode(bus) \ - do { \ - mpc5200.i2c_regs[bus->bus_idx].mcr |= MPC5200_I2C_MCR_MTX; \ - } while (0) - -/* Set receive mode */ -#define mpc5200mbus_rx_mode(bus) \ - do { \ - mpc5200.i2c_regs[bus->bus_idx].mcr &= ~MPC5200_I2C_MCR_MTX; \ - (void)mpc5200.i2c_regs[bus->bus_idx].mdr; \ - } while (0) - - -/* Transmit acknowledge when byte received */ -#define mpc5200mbus_send_ack(bus) \ - do { \ - mpc5200.i2c_regs[bus->bus_idx].mcr &= ~MPC5200_I2C_MCR_TXAK; \ - } while (0) - -/* DO NOT transmit acknowledge when byte received */ -#define mpc5200mbus_send_nack(bus) \ - do { \ - mpc5200.i2c_regs[bus->bus_idx].mcr |= MPC5200_I2C_MCR_TXAK; \ - } while (0) - -#define mpc5200mbus_error(bus,err_status) \ - do { \ - do { \ - (bus)->cmsg->status = (err_status); \ - (bus)->cmsg++; \ - } while (((bus)->cmsg - (bus)->msg < (bus)->nmsg) && \ - ((bus)->cmsg->flags & I2C_MSG_ERRSKIP)); \ - bus->cmsg--; \ - } while (0) - -/* mpc5200mbus_get_event -- - * Read MBUS module status register, determine interrupt reason and - * return appropriate event. - * - * PARAMETERS: - * bus - pointer to MBUS module descriptor structure - * - * RETURNS: - * event code - */ -static i2c_event -mpc5200mbus_get_event(mpc5200mbus *bus) -{ - i2c_event event; - uint8_t status, control; - rtems_interrupt_level level; - rtems_interrupt_disable(level); - status = mpc5200.i2c_regs[bus->bus_idx].msr; - control = mpc5200.i2c_regs[bus->bus_idx].mcr; - if (status & MPC5200_I2C_MSR_MIF) /* Interrupt occured */ - { - if (status & MPC5200_I2C_MSR_MAAS) - { - event = EVENT_SLAVE; - mpc5200.i2c_regs[bus->bus_idx].mcr = control; /* To clear Addressed As Slave - condition */ - } - else if (status & MPC5200_I2C_MSR_MAL) /* Arbitration lost */ - { - mpc5200.i2c_regs[bus->bus_idx].msr = status & ~MPC5200_I2C_MSR_MAL; - event = EVENT_ARB_LOST; - } - else if (control & MPC5200_I2C_MCR_MTX) /* Trasmit mode */ - { - if (status & MPC5200_I2C_MSR_RXAK) - event = EVENT_NACK; - else - event = EVENT_ACK; - } - else /* Received */ - { - event = EVENT_DATA_RECV; - } - - /* Clear interrupt condition */ - mpc5200.i2c_regs[bus->bus_idx].msr &= ~MPC5200_I2C_MSR_MIF; - } - else - { - event = EVENT_NONE; - } - rtems_interrupt_enable(level); - return event; -} - -static void -mpc5200mbus_machine_error(mpc5200mbus *bus, i2c_event event) -{ - return; -} - -/* mpc5200mbus_machine -- - * finite state machine for I2C bus protocol - * - * PARAMETERS: - * bus - pointer to ColdFire MBUS descriptor structure - * event - I2C event - * - * RETURNS: - * none - */ -static void -mpc5200mbus_machine(mpc5200mbus *bus, i2c_event event) -{ - uint8_t b; - switch (bus->state) - { - - case STATE_UNINITIALIZED: - /* this should never happen. */ - mpc5200mbus_machine_error(bus, event); - break; - case STATE_IDLE: - switch (event) - { - case EVENT_NEXTMSG: /* Start new message processing */ - bus->cmsg++; - /* FALLTHRU */ - - case EVENT_TRANSFER: /* Initiate new transfer */ - if (bus->cmsg - bus->msg >= bus->nmsg) - { - mpc5200mbus_stop(bus); - next_state(bus, STATE_IDLE); - bus->msg = bus->cmsg = NULL; - bus->nmsg = bus->byte = 0; - bus->done(bus->done_arg_ptr); - break; - } - - /* Initiate START or REPEATED START condition on the bus */ - if (event == EVENT_TRANSFER) - { - mpc5200mbus_start(bus); - } - else /* (event == EVENT_NEXTMSG) */ - { - mpc5200mbus_rstart(bus); - } - - bus->byte = 0; - mpc5200mbus_tx_mode(bus); - - /* Initiate slave address sending */ - if (bus->cmsg->flags & I2C_MSG_ADDR_10) - { - i2c_address a = bus->cmsg->addr; - b = 0xf0 | (((a >> 8) & 0x03) << 1); - if (bus->cmsg->flags & I2C_MSG_WR) - { - mpc5200mbus_send(bus, b); - next_state(bus, STATE_ADDR_1_W); - } - else - { - mpc5200mbus_send(bus, b | 1); - next_state(bus, STATE_ADDR_1_R); - } - } - else - { - b = (bus->cmsg->addr & ~0x01); - - if (bus->cmsg->flags & I2C_MSG_WR) - { - next_state(bus, STATE_SENDING); - } - else - { - next_state(bus, STATE_ADDR_7); - b |= 1; - } - - mpc5200mbus_send(bus, b); - } - break; - - default: - mpc5200mbus_machine_error(bus, event); - break; - } - break; - - case STATE_ADDR_7: - switch (event) - { - case EVENT_ACK: - mpc5200mbus_rx_mode(bus); - if (bus->cmsg->len <= 1) - mpc5200mbus_send_nack(bus); - else - mpc5200mbus_send_ack(bus); - next_state(bus, STATE_RECEIVING); - break; - - case EVENT_NACK: - mpc5200mbus_error(bus, I2C_NO_DEVICE); - next_state(bus, STATE_IDLE); - mpc5200mbus_machine(bus, EVENT_NEXTMSG); - break; - - case EVENT_ARB_LOST: - mpc5200mbus_error(bus, I2C_ARBITRATION_LOST); - next_state(bus, STATE_IDLE); - mpc5200mbus_machine(bus, EVENT_NEXTMSG); - break; - - default: - mpc5200mbus_machine_error(bus, event); - break; - } - break; - - case STATE_ADDR_1_R: - case STATE_ADDR_1_W: - switch (event) - { - case EVENT_ACK: - { - uint8_t b = (bus->cmsg->addr & 0xff); - mpc5200mbus_send(bus, b); - if (bus->state == STATE_ADDR_1_W) - { - next_state(bus, STATE_SENDING); - } - else - { - i2c_address a; - mpc5200mbus_rstart(bus); - mpc5200mbus_tx_mode(bus); - a = bus->cmsg->addr; - b = 0xf0 | (((a >> 8) & 0x03) << 1) | 1; - mpc5200mbus_send(bus, b); - next_state(bus, STATE_ADDR_7); - } - break; - } - - case EVENT_NACK: - mpc5200mbus_error(bus, I2C_NO_DEVICE); - next_state(bus, STATE_IDLE); - mpc5200mbus_machine(bus, EVENT_NEXTMSG); - break; - - case EVENT_ARB_LOST: - mpc5200mbus_error(bus, I2C_ARBITRATION_LOST); - next_state(bus, STATE_IDLE); - mpc5200mbus_machine(bus, EVENT_NEXTMSG); - break; - - default: - mpc5200mbus_machine_error(bus, event); - break; - } - break; - - case STATE_SENDING: - switch (event) - { - case EVENT_ACK: - if (bus->byte == bus->cmsg->len) - { - next_state(bus, STATE_IDLE); - mpc5200mbus_machine(bus, EVENT_NEXTMSG); - } - else - { - mpc5200mbus_send(bus, bus->cmsg->buf[bus->byte++]); - next_state(bus, STATE_SENDING); - } - break; - - case EVENT_NACK: - if (bus->byte == 0) - { - mpc5200mbus_error(bus, I2C_NO_DEVICE); - } - else - { - mpc5200mbus_error(bus, I2C_NO_ACKNOWLEDGE); - } - next_state(bus, STATE_IDLE); - mpc5200mbus_machine(bus, EVENT_NEXTMSG); - break; - - case EVENT_ARB_LOST: - mpc5200mbus_error(bus, I2C_ARBITRATION_LOST); - next_state(bus, STATE_IDLE); - mpc5200mbus_machine(bus, EVENT_NEXTMSG); - break; - - default: - mpc5200mbus_machine_error(bus, event); - break; - - } - break; - - case STATE_RECEIVING: - switch (event) - { - case EVENT_DATA_RECV: - if (bus->cmsg->len - bus->byte <= 2) - { - mpc5200mbus_send_nack(bus); - if (bus->cmsg->len - bus->byte <= 1) - { - if (bus->cmsg - bus->msg + 1 == bus->nmsg) - mpc5200mbus_stop(bus); - else - mpc5200mbus_rstart(bus); - } - } - else - { - mpc5200mbus_send_ack(bus); - } - bus->cmsg->buf[bus->byte++] = mpc5200.i2c_regs[bus->bus_idx].mdr; - if (bus->cmsg->len == bus->byte) - { - next_state(bus,STATE_IDLE); - mpc5200mbus_machine(bus, EVENT_NEXTMSG); - } - else - { - next_state(bus,STATE_RECEIVING); - } - break; - - case EVENT_ARB_LOST: - mpc5200mbus_error(bus, I2C_ARBITRATION_LOST); - next_state(bus, STATE_IDLE); - mpc5200mbus_machine(bus, EVENT_NEXTMSG); - break; - - default: - mpc5200mbus_machine_error(bus, event); - break; - } - break; - } -} - -/* mpc5200mbus_interrupt_handler -- - * MBUS module interrupt handler routine - * - * PARAMETERS: - * handle: pointer to mbus structure - * - * RETURNS: - * none - */ -static void mpc5200mbus_interrupt_handler(rtems_irq_hdl_param handle) -{ - i2c_event event; - mpc5200mbus *bus = handle; - - event = mpc5200mbus_get_event(bus); - /* - * clear interrupt bit - */ - mpc5200.i2c_regs[bus->bus_idx].msr &= ~MPC5200_I2C_MSR_MIF; - - mpc5200mbus_machine(bus, event); -} - -/* - * mpc5200_mbus_irq_enable - * enable irq for mbus - */ -static void mpc5200mbus_irq_enable(const rtems_irq_connect_data* ptr) -{ - int minor = ((mpc5200mbus*)(ptr->handle))->bus_idx; - - mpc5200.i2c_regs[minor].mcr |= MPC5200_I2C_MCR_MIEN; -} - -/* - * mpc5200_mbus_irq_disable - * enable irq for mbus - */ -static void mpc5200mbus_irq_disable(const rtems_irq_connect_data* ptr) -{ - int minor = ((mpc5200mbus*)(ptr->handle))->bus_idx; - - mpc5200.i2c_regs[minor].mcr &= ~MPC5200_I2C_MCR_MIEN; -} - -/* - * mpc5200_mbus_isOn - * check, whether irq is enabled - */ -static int mpc5200mbus_irq_isOn(const rtems_irq_connect_data* ptr) -{ - int minor = ((mpc5200mbus*)(ptr->handle))->bus_idx; - - return (0 != (mpc5200.i2c_regs[minor].mcr & MPC5200_I2C_MCR_MIEN)); -} - -/* mpc5200mbus_poll -- - * MBUS module poll routine; used to poll events when I2C driver - * operates in poll-driven mode. - * - * PARAMETERS: - * none - * - * RETURNS: - * none - */ -void -mpc5200mbus_poll(mpc5200mbus *bus) -{ - i2c_event event; - event = mpc5200mbus_get_event(bus); - if (event != EVENT_NONE) - mpc5200mbus_machine(bus, event); -} - -/* mpc5200mbus_select_clock_divider -- - * Select divider for system clock which is used for I2C bus clock - * generation. Not each divider can be selected for I2C bus; this - * function select nearest larger or equal divider. - * - * PARAMETERS: - * i2c_bus - pointer to the bus descriptor structure - * divider - system frequency divider for I2C serial clock. - * RETURNS: - * RTEMS_SUCCESSFUL, if operation performed successfully, or - * RTEMS error code when failed. - */ -rtems_status_code -mpc5200mbus_select_clock_divider(mpc5200mbus *bus, int divider) -{ - int i; - int mbc; - struct { - int divider; - int mbc; - } dividers[] ={ - { 20, 0x20 }, { 22, 0x21 }, { 24, 0x22 }, { 26, 0x23 }, - { 28, 0x00 }, { 30, 0x01 }, { 32, 0x25 }, { 34, 0x02 }, - { 36, 0x26 }, { 40, 0x03 }, { 44, 0x04 }, { 48, 0x05 }, - { 56, 0x06 }, { 64, 0x2a }, { 68, 0x07 }, { 72, 0x2B }, - { 80, 0x08 }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A }, - { 112, 0x2E }, { 128, 0x0B }, { 144, 0x0C }, { 160, 0x0D }, - { 192, 0x0E }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 }, - { 288, 0x10 }, { 320, 0x11 }, { 384, 0x12 }, { 448, 0x36 }, - { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x15 }, - { 768, 0x16 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B }, - { 1152, 0x18 }, { 1280, 0x19 }, { 1536, 0x1A }, { 1792, 0x3E }, - { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D }, - { 3072, 0x1E }, { 3840, 0x1F } - }; - - if (bus == NULL) - return RTEMS_INVALID_ADDRESS; - - for (i = 0, mbc = -1; i < sizeof(dividers)/sizeof(dividers[0]); i++) - { - mbc = dividers[i].mbc; - if (dividers[i].divider >= divider) - { - break; - } - } - mpc5200.i2c_regs[bus->bus_idx].mfdr = mbc; - return RTEMS_SUCCESSFUL; -} - -/* mpc5200mbus_initialize -- - * Initialize MPC5200 MBUS I2C bus controller. - * - * PARAMETERS: - * i2c_bus - pointer to the bus descriptor structure - * - * RETURNS: - * RTEMS_SUCCESSFUL, or RTEMS error code when initialization failed. - */ -rtems_status_code -mpc5200mbus_initialize(mpc5200mbus *i2c_bus) -{ - rtems_interrupt_level level; - rtems_status_code sc; - rtems_irq_connect_data mbusIrqData; - - if (i2c_bus == NULL) - return RTEMS_INVALID_ADDRESS; - - if (i2c_bus->state != STATE_UNINITIALIZED) /* Check if already initialized */ - return RTEMS_RESOURCE_IN_USE; - - i2c_bus->state = STATE_IDLE; - i2c_bus->msg = NULL; - i2c_bus->cmsg = NULL; - i2c_bus->nmsg = 0; - i2c_bus->byte = 0; - - /* - * install interrupt handler - */ - mbusIrqData.on = mpc5200mbus_irq_enable; - mbusIrqData.off = mpc5200mbus_irq_disable; - mbusIrqData.isOn = mpc5200mbus_irq_isOn; - mbusIrqData.handle = (rtems_irq_hdl_param)i2c_bus; - mbusIrqData.hdl = mpc5200mbus_interrupt_handler; - switch(i2c_bus->bus_idx) { - case 0: - mbusIrqData.name = BSP_SIU_IRQ_I2C1; - break; - case 1: - mbusIrqData.name = BSP_SIU_IRQ_I2C2; - break; - } - if (!BSP_install_rtems_irq_handler (&mbusIrqData)) { - sc = RTEMS_UNSATISFIED; - return sc; - } - - rtems_interrupt_disable(level); - - mpc5200.i2c_regs[i2c_bus->bus_idx].mcr &= ~MPC5200_I2C_MCR_MEN; - mpc5200.i2c_regs[i2c_bus->bus_idx].msr = 0; - mpc5200.i2c_regs[i2c_bus->bus_idx].mdr = 0x1F; /* Maximum possible divider is 3840 */ - mpc5200.i2c_regs[i2c_bus->bus_idx].mcr |= MPC5200_I2C_MCR_MEN; - - rtems_interrupt_enable(level); - - return RTEMS_SUCCESSFUL; -} - -/* mpc5200mbus_i2c_transfer -- - * Initiate multiple-messages transfer over I2C bus via ColdFire MBUS - * controller. - * - * PARAMETERS: - * bus - pointer to MBUS controller descriptor - * nmsg - number of messages - * msg - pointer to messages array - * done - function which is called when transfer is finished - * done_arg_ptr - arbitrary argument pointer passed to done funciton - * - * RETURNS: - * RTEMS_SUCCESSFUL if transfer initiated successfully, or error - * code when failed. - */ -rtems_status_code -mpc5200mbus_i2c_transfer(mpc5200mbus *bus, int nmsg, i2c_message *msg, - i2c_transfer_done done, void *done_arg_ptr) -{ - if (bus->state == STATE_UNINITIALIZED) - return RTEMS_NOT_CONFIGURED; - - bus->done = done; - bus->done_arg_ptr = done_arg_ptr; - bus->cmsg = bus->msg = msg; - bus->nmsg = nmsg; - bus->byte = 0; - bus->state = STATE_IDLE; - mpc5200mbus_machine(bus, EVENT_TRANSFER); - return RTEMS_SUCCESSFUL; -} - - -/* mpc5200mbus_i2c_done -- - * Close ColdFire MBUS I2C bus controller and release all resources. - * - * PARAMETERS: - * bus - pointer to MBUS controller descriptor - * - * RETURNS: - * RTEMS_SUCCESSFUL, if transfer initiated successfully, or error - * code when failed. - */ -rtems_status_code -mpc5200mbus_i2c_done(mpc5200mbus *i2c_bus) -{ - rtems_status_code sc = RTEMS_SUCCESSFUL; - - if (i2c_bus->state == STATE_UNINITIALIZED) - return RTEMS_NOT_CONFIGURED; - - mpc5200.i2c_regs[i2c_bus->bus_idx].mcr = 0; - - return sc; -} |