diff options
Diffstat (limited to 'c/src/lib/libcpu/powerpc/mpc83xx/i2c/mpc83xx_i2cdrv.c')
| -rw-r--r-- | c/src/lib/libcpu/powerpc/mpc83xx/i2c/mpc83xx_i2cdrv.c | 668 |
1 files changed, 0 insertions, 668 deletions
diff --git a/c/src/lib/libcpu/powerpc/mpc83xx/i2c/mpc83xx_i2cdrv.c b/c/src/lib/libcpu/powerpc/mpc83xx/i2c/mpc83xx_i2cdrv.c deleted file mode 100644 index b4c3d477f7..0000000000 --- a/c/src/lib/libcpu/powerpc/mpc83xx/i2c/mpc83xx_i2cdrv.c +++ /dev/null @@ -1,668 +0,0 @@ -/*===============================================================*\ -| Project: RTEMS support for MPC83xx | -+-----------------------------------------------------------------+ -| Copyright (c) 2007 | -| 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. | -| | -+-----------------------------------------------------------------+ -| this file contains the MPC83xx I2C driver | -\*===============================================================*/ -#include <stdlib.h> -#include <bsp.h> -#include <bsp/irq.h> -#include <mpc83xx/mpc83xx_i2cdrv.h> -#include <rtems/error.h> -#include <rtems/bspIo.h> -#include <errno.h> -#include <rtems/libi2c.h> - -#undef DEBUG - -#if defined(LIBBSP_POWERPC_GEN83XX_BSP_H) - #define I2CCR_MEN (1 << 7) /* module enable */ -#elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H) - #define I2CCR_MDIS (1 << 7) /* module disable */ -#endif -#define I2CCR_MIEN (1 << 6) /* module interrupt enable */ -#define I2CCR_MSTA (1 << 5) /* 0->1 generates a start condiiton, 1->0 a stop */ -#define I2CCR_MTX (1 << 4) /* 0 = receive mode, 1 = transmit mode */ -#define I2CCR_TXAK (1 << 3) /* 0 = send ack 1 = send nak during receive */ -#define I2CCR_RSTA (1 << 2) /* 1 = send repeated start condition */ -#define I2CCR_BCST (1 << 0) /* 0 = disable 1 = enable broadcast accept */ - -#define I2CSR_MCF (1 << 7) /* data transfer (0=transfer in progres) */ -#define I2CSR_MAAS (1 << 6) /* addessed as slave */ -#define I2CSR_MBB (1 << 5) /* bus busy */ -#define I2CSR_MAL (1 << 4) /* arbitration lost */ -#define I2CSR_BCSTM (1 << 3) /* broadcast match */ -#define I2CSR_SRW (1 << 2) /* slave read/write */ -#define I2CSR_MIF (1 << 1) /* module interrupt */ -#define I2CSR_RXAK (1 << 0) /* receive acknowledge */ - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static rtems_status_code mpc83xx_i2c_find_clock_divider -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| determine proper divider value | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - uint8_t *result, /* result value */ - int divider /* requested divider */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| o = ok or error code | -\*=========================================================================*/ -{ - int i; - int fdr_val; - rtems_status_code sc = RTEMS_SUCCESSFUL; - struct { - int divider; - int fdr_val; - } dividers[] ={ -#if defined(LIBBSP_POWERPC_GEN83XX_BSP_H) - { 256,0x20 }, { 288,0x21 }, { 320,0x22 }, { 352,0x23 }, - { 384,0x00 }, { 416,0x01 }, { 448,0x25 }, { 480,0x02 }, - { 512,0x26 }, { 576,0x03 }, { 640,0x04 }, { 704,0x05 }, - { 768,0x29 }, { 832,0x06 }, { 896,0x2a }, { 1024,0x07 }, - { 1152,0x08 }, { 1280,0x09 }, { 1536,0x0A }, { 1792,0x2E }, - { 1920,0x0B }, { 2048,0x2F }, { 2304,0x0C }, { 2560,0x0D }, - { 3072,0x0E }, { 3584,0x32 }, { 3840,0x0F }, { 4096,0x33 }, - { 4608,0x10 }, { 5120,0x11 }, { 6144,0x12 }, { 7168,0x36 }, - { 7680,0x13 }, { 8192,0x37 }, { 9216,0x14 }, {10240,0x15 }, - {12288,0x16 }, {14336,0x3A }, {15360,0x17 }, {16384,0x3B }, - {18432,0x18 }, {20480,0x19 }, {24576,0x1A }, {28672,0x3E }, - {30720,0x1B }, {32768,0x3F }, {36864,0x1C }, {40960,0x1D }, - {49152,0x1E }, {61440,0x1F } -#elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H) - { 768, 0x31 } -#endif - }; - - if (divider <= 0) { - sc = RTEMS_INVALID_NUMBER; - } - - if (sc == RTEMS_SUCCESSFUL) { - sc = RTEMS_INVALID_NUMBER; - for (i = 0, fdr_val = -1; i < sizeof(dividers)/sizeof(dividers[0]); i++) { - fdr_val = dividers[i].fdr_val; - if (dividers[i].divider >= divider) - { - sc = RTEMS_SUCCESSFUL; - *result = fdr_val; - break; - } - } - } - return sc; -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static int mpc83xx_i2c_wait -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| wait for i2c to become idle | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - mpc83xx_i2c_softc_t *softc_ptr, /* handle */ - uint8_t desired_status, /* desired status word */ - uint8_t status_mask /* status word mask */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| o = ok or error code | -\*=========================================================================*/ -{ - uint8_t act_status; - rtems_status_code rc; - uint32_t tout; - -#if defined(DEBUG) - printk("mpc83xx_i2c_wait called... "); -#endif - - if (softc_ptr->initialized) { - /* - * enable interrupt mask - */ - softc_ptr->reg_ptr->i2ccr |= I2CCR_MIEN; - rc = rtems_semaphore_obtain(softc_ptr->irq_sema_id,RTEMS_WAIT,100); - if (rc != RTEMS_SUCCESSFUL) { - return rc; - } - } - else { - tout = 0; - do { - if (tout++ > 1000000) { -#if defined(DEBUG) - printk("... exit with RTEMS_TIMEOUT\r\n"); -#endif - return RTEMS_TIMEOUT; - } - } while (!(softc_ptr->reg_ptr->i2csr & I2CSR_MIF)); - } - softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MIEN; - - act_status = softc_ptr->reg_ptr->i2csr; - if ((act_status & status_mask) != desired_status) { -#if defined(DEBUG) - printk("... exit with RTEMS_IO_ERROR\r\n"); -#endif - return RTEMS_IO_ERROR; - } -#if defined(DEBUG) - printk("... exit OK\r\n"); -#endif - return RTEMS_SUCCESSFUL; -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static void mpc83xx_i2c_irq_handler -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| handle interrupts | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - rtems_irq_hdl_param handle /* handle, is softc_ptr structure */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| <none> | -\*=========================================================================*/ -{ - mpc83xx_i2c_softc_t *softc_ptr = (mpc83xx_i2c_softc_t *)handle; - - /* - * clear IRQ flag - */ - #if defined(LIBBSP_POWERPC_GEN83XX_BSP_H) - softc_ptr->reg_ptr->i2csr &= ~I2CSR_MIF; - #elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H) - softc_ptr->reg_ptr->i2csr = I2CSR_MIF; - #endif - - /* - * disable interrupt mask - */ - softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MIEN; - if (softc_ptr->initialized) { - rtems_semaphore_release(softc_ptr->irq_sema_id); - } -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static void mpc83xx_i2c_irq_on_off -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| enable/disable interrupts (void, handled at different position) | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - const - rtems_irq_connect_data *irq_conn_data /* irq connect data */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| <none> | -\*=========================================================================*/ -{ -} - - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static int mpc83xx_i2c_irq_isOn -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| check state of interrupts, void, done differently | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - const - rtems_irq_connect_data *irq_conn_data /* irq connect data */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| TRUE, if enabled | -\*=========================================================================*/ -{ - return (TRUE); -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static void mpc83xx_i2c_install_irq_handler -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| (un-)install the interrupt handler | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - mpc83xx_i2c_softc_t *softc_ptr, /* ptr to control structure */ - int install /* TRUE: install, FALSE: remove */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| <none> | -\*=========================================================================*/ -{ - rtems_status_code rc = RTEMS_SUCCESSFUL; - - rtems_irq_connect_data irq_conn_data = { - softc_ptr->irq_number, - mpc83xx_i2c_irq_handler, /* rtems_irq_hdl */ - (rtems_irq_hdl_param)softc_ptr, /* (rtems_irq_hdl_param) */ - mpc83xx_i2c_irq_on_off, /* (rtems_irq_enable) */ - mpc83xx_i2c_irq_on_off, /* (rtems_irq_disable) */ - mpc83xx_i2c_irq_isOn /* (rtems_irq_is_enabled) */ - }; - - /* - * (un-)install handler for I2C device - */ - if (install) { - /* - * create semaphore for IRQ synchronization - */ - rc = rtems_semaphore_create(rtems_build_name('i','2','c','s'), - 0, - RTEMS_FIFO - | RTEMS_SIMPLE_BINARY_SEMAPHORE, - 0, - &softc_ptr->irq_sema_id); - if (rc != RTEMS_SUCCESSFUL) { - rtems_panic("I2C: cannot create semaphore"); - } - if (!BSP_install_rtems_irq_handler (&irq_conn_data)) { - rtems_panic("I2C: cannot install IRQ handler"); - } - } - else { - if (!BSP_remove_rtems_irq_handler (&irq_conn_data)) { - rtems_panic("I2C: cannot uninstall IRQ handler"); - } - /* - * delete sync semaphore - */ - if (softc_ptr->irq_sema_id != 0) { - rc = rtems_semaphore_delete(softc_ptr->irq_sema_id); - if (rc != RTEMS_SUCCESSFUL) { - rtems_panic("I2C: cannot delete semaphore"); - } - } - } -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static rtems_status_code mpc83xx_i2c_init -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| initialize the driver | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - rtems_libi2c_bus_t *bh /* bus specifier structure */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| o = ok or error code | -\*=========================================================================*/ -{ - mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc); - uint8_t fdr_val; - int errval; -#if defined(DEBUG) - printk("mpc83xx_i2c_init called... "); -#endif - /* - * init HW registers - */ - /* - * init frequency divider to 100kHz - */ - errval = mpc83xx_i2c_find_clock_divider(&fdr_val, - softc_ptr->base_frq/100000); - if (errval != 0) { - return errval; - } - softc_ptr->reg_ptr->i2cfdr = fdr_val; - /* - * init digital filter sampling rate - */ - softc_ptr->reg_ptr->i2cdfsrr = 0x10 ; /* no special filtering needed */ - /* - * set own slave address to broadcast (0x00) - */ - softc_ptr->reg_ptr->i2cadr = 0x00 ; - - /* - * set control register to module enable - */ - #if defined(LIBBSP_POWERPC_GEN83XX_BSP_H) - softc_ptr->reg_ptr->i2ccr = I2CCR_MEN; - #elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H) - softc_ptr->reg_ptr->i2ccr = 0; - #endif - - /* - * init interrupt stuff - */ - mpc83xx_i2c_install_irq_handler(softc_ptr,TRUE); - - /* - * mark, that we have initialized - */ - softc_ptr->initialized = TRUE; -#if defined(DEBUG) - printk("... exit OK\r\n"); -#endif - return RTEMS_SUCCESSFUL; -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static rtems_status_code mpc83xx_i2c_send_start -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| send a start condition to bus | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - rtems_libi2c_bus_t *bh /* bus specifier structure */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| o = ok or error code | -\*=========================================================================*/ -{ - mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc); - -#if defined(DEBUG) - printk("mpc83xx_i2c_send_start called... "); -#endif - if (0 != (softc_ptr->reg_ptr->i2ccr & I2CCR_MSTA)) { - /* - * already started, so send a "repeated start" - */ - softc_ptr->reg_ptr->i2ccr |= I2CCR_RSTA; - } - else { - softc_ptr->reg_ptr->i2ccr |= I2CCR_MSTA; - } - -#if defined(DEBUG) - printk("... exit OK\r\n"); -#endif - return 0; -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static rtems_status_code mpc83xx_i2c_send_stop -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| send a stop condition to bus | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - rtems_libi2c_bus_t *bh /* bus specifier structure */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| o = ok or error code | -\*=========================================================================*/ -{ - mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc); - -#if defined(DEBUG) - printk("mpc83xx_i2c_send_stop called... "); -#endif - softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MSTA; - /* - * wait, 'til stop has been executed - */ - while (0 != (softc_ptr->reg_ptr->i2csr & I2CSR_MBB)) { - rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); - } -#if defined(DEBUG) - printk("... exit OK\r\n"); -#endif - return 0; -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static rtems_status_code mpc83xx_i2c_send_addr -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| address a slave device on the bus | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - rtems_libi2c_bus_t *bh, /* bus specifier structure */ - uint32_t addr, /* address to send on bus */ - int rw /* 0=write,1=read */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| o = ok or error code | -\*=========================================================================*/ -{ - mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc); - uint8_t addr_byte; - rtems_status_code rc; - -#if defined(DEBUG) - printk("mpc83xx_i2c_send_addr called... "); -#endif - softc_ptr->reg_ptr->i2ccr |= I2CCR_MTX; - /* - * determine, whether short or long address is needed, determine rd/wr - */ - if (addr > 0x7f) { - addr_byte = (0xf0 - | ((addr >> 7) & 0x06) - | ((rw) ? 1 : 0)); - /* - * send first byte - */ - softc_ptr->reg_ptr->i2cdr = addr_byte; - /* - * wait for successful transfer - */ - rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF | I2CSR_RXAK); - if (rc != RTEMS_SUCCESSFUL) { -#if defined(DEBUG) - printk("... exit rc=%d\r\n",rc); -#endif - return rc; - } - } - /* - * send (final) byte - */ - addr_byte = ((addr << 1) - | ((rw) ? 1 : 0)); - - softc_ptr->reg_ptr->i2cdr = addr_byte; - /* - * wait for successful transfer - */ - rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF | I2CSR_RXAK); - -#if defined(DEBUG) - printk("... exit rc=%d\r\n",rc); -#endif - return rc; -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static int mpc83xx_i2c_read_bytes -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| receive some bytes from I2C device | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - rtems_libi2c_bus_t *bh, /* bus specifier structure */ - unsigned char *buf, /* buffer to store bytes */ - int len /* number of bytes to receive */ -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| number of bytes received or (negative) error code | -\*=========================================================================*/ -{ - mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc); - rtems_status_code rc; - unsigned char *p = buf; - -#if defined(DEBUG) - printk("mpc83xx_i2c_read_bytes called... "); -#endif - softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MTX; - softc_ptr->reg_ptr->i2ccr &= ~I2CCR_TXAK; - /* - * FIXME: do we need to deactivate TXAK from the start, - * when only one byte is to be received? - */ - /* - * we need a dummy transfer here to start the first read - */ - softc_ptr->reg_ptr->i2cdr; - - while (len-- > 0) { - if (len == 0) { - /* - * last byte is not acknowledged - */ - softc_ptr->reg_ptr->i2ccr |= I2CCR_TXAK; - } - /* - * wait 'til end of transfer - */ - rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF); - if (rc != RTEMS_SUCCESSFUL) { -#if defined(DEBUG) - printk("... exit rc=%d\r\n",-rc); -#endif - return -rc; - } - *p++ = softc_ptr->reg_ptr->i2cdr; - - } - - /* - * wait 'til end of last transfer - */ - rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF); - -#if defined(DEBUG) - printk("... exit OK, rc=%d\r\n",p-buf); -#endif - return p - buf; -} - -/*=========================================================================*\ -| Function: | -\*-------------------------------------------------------------------------*/ -static int mpc83xx_i2c_write_bytes -( -/*-------------------------------------------------------------------------*\ -| Purpose: | -| send some bytes to I2C device | -+---------------------------------------------------------------------------+ -| Input Parameters: | -\*-------------------------------------------------------------------------*/ - rtems_libi2c_bus_t *bh, /* bus specifier structure */ - unsigned char *buf, /* buffer to send */ - int len /* number of bytes to send */ - -) -/*-------------------------------------------------------------------------*\ -| Return Value: | -| number of bytes sent or (negative) error code | -\*=========================================================================*/ -{ - mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc); - rtems_status_code rc; - unsigned char *p = buf; - -#if defined(DEBUG) - printk("mpc83xx_i2c_write_bytes called... "); -#endif - softc_ptr->reg_ptr->i2ccr = - (softc_ptr->reg_ptr->i2ccr & ~I2CCR_TXAK) | I2CCR_MTX; - while (len-- > 0) { - int rxack = len != 0 ? I2CSR_RXAK : 0; - - softc_ptr->reg_ptr->i2cdr = *p++; - /* - * wait 'til end of transfer - */ - rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF | rxack); - if (rc != RTEMS_SUCCESSFUL) { -#if defined(DEBUG) - printk("... exit rc=%d\r\n",-rc); -#endif - return -rc; - } - } -#if defined(DEBUG) - printk("... exit OK, rc=%d\r\n",p-buf); -#endif - return p - buf; -} - -rtems_libi2c_bus_ops_t mpc83xx_i2c_ops = { - .init = mpc83xx_i2c_init, - .send_start = mpc83xx_i2c_send_start, - .send_stop = mpc83xx_i2c_send_stop, - .send_addr = mpc83xx_i2c_send_addr, - .read_bytes = mpc83xx_i2c_read_bytes, - .write_bytes = mpc83xx_i2c_write_bytes, -}; - |