+++ /dev/null
-/**
- * \file
- * <!--
- * This file is part of BeRTOS.
- *
- * Bertos is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * As a special exception, you may use this file as part of a free software
- * library without restriction. Specifically, if other files instantiate
- * templates or use macros or inline functions from this file, or you compile
- * this file and link it with other files to produce an executable, this
- * file does not by itself cause the resulting executable to be covered by
- * the GNU General Public License. This exception does not however
- * invalidate any other reasons why the executable file might be covered by
- * the GNU General Public License.
- *
- * Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
- *
- * -->
- *
- * \version $Id$
- *
- * \author Stefano Fedrigo <aleph@develer.com>
- * \author Giovanni Bajo <rasky@develer.com>
- *
- * \brief DSP5680x CPU specific serial I/O driver
- */
-
-/*#*
- *#* $Log$
- *#* Revision 1.14 2006/07/19 12:56:26 bernie
- *#* Convert to new Doxygen style.
- *#*
- *#* Revision 1.13 2005/11/04 16:20:02 bernie
- *#* Fix reference to README.devlib in header.
- *#*
- *#* Revision 1.12 2005/04/11 19:10:27 bernie
- *#* Include top-level headers from cfg/ subdir.
- *#*
- *#* Revision 1.11 2005/01/25 07:42:04 bernie
- *#* Simplify.
- *#*
- *#* Revision 1.10 2005/01/14 00:48:33 aleph
- *#* Rename callbacks; SerialHardwareVT.txSending: New callback.
- *#*
- *#* Revision 1.9 2004/12/08 09:42:55 bernie
- *#* Add support for multiplexed serial ports.
- *#*
- *#* Revision 1.8 2004/10/26 09:00:49 bernie
- *#* Don't access serial data register twice.
- *#*
- *#* Revision 1.7 2004/10/19 08:57:15 bernie
- *#* Bugfixes for DSP56K serial driver from scfirm.
- *#*
- *#* Revision 1.5 2004/08/25 14:12:08 rasky
- *#* Aggiornato il comment block dei log RCS
- *#*
- *#* Revision 1.4 2004/07/30 14:27:49 rasky
- *#* Aggiornati alcuni file DSP56k per la nuova libreria di IRQ management
- *#*
- *#* Revision 1.3 2004/06/03 11:27:09 bernie
- *#* Add dual-license information.
- *#*
- *#* Revision 1.2 2004/05/23 18:21:53 bernie
- *#* Trim CVS logs and cleanup header info.
- *#*/
-
-#include <ser.h>
-#include <ser_p.h>
-#include <drv/irq.h>
-#include <cfg/debug.h>
-#include <hw.h>
-#include <DSP56F807.h>
-
-// GPIO E is shared with SPI (in DSP56807). Pins 0&1 are TXD0 and RXD0. To use
-// the serial, we need to disable the GPIO functions on them.
-#define REG_GPIO_SERIAL_0 REG_GPIO_E
-#define REG_GPIO_SERIAL_MASK_0 0x03
-
-#define REG_GPIO_SERIAL_1 REG_GPIO_D
-#define REG_GPIO_SERIAL_MASK_1 0xC0
-
-
-// Check flag consistency
-#if (SERRF_PARITYERROR != REG_SCI_SR_PF) || \
- (SERRF_RXSROVERRUN != REG_SCI_SR_OR) || \
- (SERRF_FRAMEERROR != REG_SCI_SR_FE) || \
- (SERRF_NOISEERROR != REG_SCI_SR_NF)
- #error error flags do not match with register bits
-#endif
-
-static unsigned char ser0_fifo_rx[CONFIG_SER0_FIFOSIZE_RX];
-static unsigned char ser0_fifo_tx[CONFIG_SER0_FIFOSIZE_TX];
-static unsigned char ser1_fifo_rx[CONFIG_SER1_FIFOSIZE_RX];
-static unsigned char ser1_fifo_tx[CONFIG_SER1_FIFOSIZE_TX];
-
-#if CONFIG_SER_MULTI
- #include <kern/sem.h>
-
- #define MAX_MULTI_GROUPS 1
-
- struct Semaphore multi_sems[MAX_MULTI_GROUPS];
-#endif
-
-
-struct SCI
-{
- struct SerialHardware hw;
- struct Serial* serial;
- volatile struct REG_SCI_STRUCT* regs;
- IRQ_VECTOR irq_tx;
- IRQ_VECTOR irq_rx;
- int num_group;
- int id;
-};
-
-static inline void enable_tx_irq_bare(volatile struct REG_SCI_STRUCT* regs)
-{
- regs->CR |= REG_SCI_CR_TEIE | REG_SCI_CR_TIIE;
-}
-
-static inline void enable_rx_irq_bare(volatile struct REG_SCI_STRUCT* regs)
-{
- regs->CR |= REG_SCI_CR_RIE;
-}
-
-static inline void disable_tx_irq_bare(volatile struct REG_SCI_STRUCT* regs)
-{
- regs->CR &= ~(REG_SCI_CR_TEIE | REG_SCI_CR_TIIE);
-}
-
-static inline void disable_rx_irq_bare(volatile struct REG_SCI_STRUCT* regs)
-{
- regs->CR &= ~(REG_SCI_CR_RIE | REG_SCI_CR_REIE);
-}
-
-static inline void disable_tx_irq(struct SerialHardware* _hw)
-{
- struct SCI* hw = (struct SCI*)_hw;
-
- disable_tx_irq_bare(hw->regs);
-}
-
-static inline void disable_rx_irq(struct SerialHardware* _hw)
-{
- struct SCI* hw = (struct SCI*)_hw;
-
- disable_rx_irq_bare(hw->regs);
-}
-
-static inline void enable_tx_irq(struct SerialHardware* _hw)
-{
- struct SCI* hw = (struct SCI*)_hw;
-
- enable_tx_irq_bare(hw->regs);
-}
-
-static inline void enable_rx_irq(struct SerialHardware* _hw)
-{
- struct SCI* hw = (struct SCI*)_hw;
-
- enable_rx_irq_bare(hw->regs);
-}
-
-static inline bool tx_irq_enabled(struct SerialHardware* _hw)
-{
- struct SCI* hw = (struct SCI*)_hw;
-
- return (hw->regs->CR & REG_SCI_CR_TEIE);
-}
-
-static void tx_isr(const struct SCI *hw)
-{
-#pragma interrupt warn
- volatile struct REG_SCI_STRUCT* regs = hw->regs;
-
- if (fifo_isempty(&hw->serial->txfifo))
- disable_tx_irq_bare(regs);
- else
- {
- // Clear transmitter flags before sending data
- (void)regs->SR;
- regs->DR = fifo_pop(&hw->serial->txfifo);
- }
-}
-
-static void rx_isr(const struct SCI *hw)
-{
-#pragma interrupt warn
- volatile struct REG_SCI_STRUCT* regs = hw->regs;
-
- // Propagate errors
- hw->serial->status |= regs->SR & (SERRF_PARITYERROR |
- SERRF_RXSROVERRUN |
- SERRF_FRAMEERROR |
- SERRF_NOISEERROR);
-
- /*
- * Serial IRQ can happen for two reason: data ready (RDRF) or overrun (OR)
- * If the data is ready, we need to fetch it from the data register or
- * the interrupt will retrigger immediatly. In case of overrun, instead,
- * the value of the data register is meaningless.
- */
- if (regs->SR & REG_SCI_SR_RDRF)
- {
- unsigned char data = regs->DR;
-
- if (fifo_isfull(&hw->serial->rxfifo))
- hw->serial->status |= SERRF_RXFIFOOVERRUN;
- else
- fifo_push(&hw->serial->rxfifo, data);
- }
-
- // Writing anything to the status register clear the error bits.
- regs->SR = 0;
-}
-
-static void init(struct SerialHardware* _hw, struct Serial* ser)
-{
- struct SCI* hw = (struct SCI*)_hw;
- volatile struct REG_SCI_STRUCT* regs = hw->regs;
-
- // Clear status register (IRQ/status flags)
- (void)regs->SR;
- regs->SR = 0;
-
- // Clear data register
- (void)regs->DR;
-
- // Install the handlers and set priorities for both IRQs
- irq_install(hw->irq_tx, (isr_t)tx_isr, hw);
- irq_install(hw->irq_rx, (isr_t)rx_isr, hw);
- irq_setpriority(hw->irq_tx, IRQ_PRIORITY_SCI_TX);
- irq_setpriority(hw->irq_rx, IRQ_PRIORITY_SCI_RX);
-
- // Activate the RX error interrupts, and RX/TX transmissions
- regs->CR = REG_SCI_CR_TE | REG_SCI_CR_RE;
- enable_rx_irq_bare(regs);
-
- // Disable GPIO pins for TX and RX lines
- // \todo this should be divided into serial 0 and 1
- REG_GPIO_SERIAL_0->PER |= REG_GPIO_SERIAL_MASK_0;
- REG_GPIO_SERIAL_1->PER |= REG_GPIO_SERIAL_MASK_1;
-
- hw->serial = ser;
-}
-
-static void cleanup(struct SerialHardware* _hw)
-{
- struct SCI* hw = (struct SCI*)_hw;
-
- // Uninstall the ISRs
- disable_rx_irq(_hw);
- disable_tx_irq(_hw);
- irq_uninstall(hw->irq_tx);
- irq_uninstall(hw->irq_rx);
-}
-
-static void setbaudrate(struct SerialHardware* _hw, unsigned long rate)
-{
- struct SCI* hw = (struct SCI*)_hw;
-
- // SCI has an internal 16x divider on the input clock, which comes
- // from the IPbus (see the scheme in user manual, 12.7.3). We apply
- // it to calculate the period to store in the register.
- hw->regs->BR = (IPBUS_FREQ + rate * 8ul) / (rate * 16ul);
-}
-
-static void setparity(struct SerialHardware* _hw, int parity)
-{
- // ???
- ASSERT(0);
-}
-
-
-#if CONFIG_SER_MULTI
-
-static void multi_init(void)
-{
- static bool flag = false;
- int i;
-
- if (flag)
- return;
-
- for (i = 0; i < MAX_MULTI_GROUPS; ++i)
- sem_init(&multi_sems[i]);
- flag = true;
-}
-
-static void init_lock(struct SerialHardware* _hw, struct Serial *ser)
-{
- struct SCI* hw = (struct SCI*)_hw;
-
- // Initialize the multi engine (if needed)
- multi_init();
-
- // Acquire the lock of the semaphore for this group
- ASSERT(hw->num_group >= 0);
- ASSERT(hw->num_group < MAX_MULTI_GROUPS);
- sem_obtain(&multi_sems[hw->num_group]);
-
- // Do a hardware switch to the given serial
- ser_hw_switch(hw->num_group, hw->id);
-
- init(_hw, ser);
-}
-
-static void cleanup_unlock(struct SerialHardware* _hw)
-{
- struct SCI* hw = (struct SCI*)_hw;
-
- cleanup(_hw);
-
- sem_release(&multi_sems[hw->num_group]);
-}
-
-#endif /* CONFIG_SER_MULTI */
-
-
-static const struct SerialHardwareVT SCI_VT =
-{
- .init = init,
- .cleanup = cleanup,
- .setBaudrate = setbaudrate,
- .setParity = setparity,
- .txStart = enable_tx_irq,
- .txSending = tx_irq_enabled,
-};
-
-#if CONFIG_SER_MULTI
-static const struct SerialHardwareVT SCI_MULTI_VT =
-{
- .init = init_lock,
- .cleanup = cleanup_unlock,
- .setBaudrate = setbaudrate,
- .setParity = setparity,
- .txStart = enable_tx_irq,
- .txSending = tx_irq_enabled,
-};
-#endif /* CONFIG_SER_MULTI */
-
-#define SCI_DESC_NORMAL(hwch) \
- { \
- .hw = \
- { \
- .table = &SCI_VT, \
- .rxbuffer = ser ## hwch ## _fifo_rx, \
- .txbuffer = ser ## hwch ## _fifo_tx, \
- .rxbuffer_size = countof(ser ## hwch ## _fifo_rx), \
- .txbuffer_size = countof(ser ## hwch ## _fifo_tx), \
- }, \
- .regs = ®_SCI[hwch], \
- .irq_rx = IRQ_SCI ## hwch ## _RECEIVER_FULL, \
- .irq_tx = IRQ_SCI ## hwch ## _TRANSMITTER_READY, \
- .num_group = -1, \
- .id = -1, \
- } \
- /**/
-
-#if CONFIG_SER_MULTI
-#define SCI_DESC_MULTI(hwch, group_, id_) \
- { \
- .hw = \
- { \
- .table = &SCI_MULTI_VT, \
- .rxbuffer = ser ## hwch ## _fifo_rx, \
- .txbuffer = ser ## hwch ## _fifo_tx, \
- .rxbuffer_size = countof(ser ## hwch ## _fifo_rx), \
- .txbuffer_size = countof(ser ## hwch ## _fifo_tx), \
- }, \
- .regs = ®_SCI[hwch], \
- .irq_rx = IRQ_SCI ## hwch ## _RECEIVER_FULL, \
- .irq_tx = IRQ_SCI ## hwch ## _TRANSMITTER_READY, \
- .num_group = group_, \
- .id = id_, \
- } \
- /**/
-#endif /* CONFIG_SER_MULTI */
-
-// \todo Move this into hw.h, with a little preprocessor magic
-static struct SCI SCIDescs[] =
-{
- SCI_DESC_NORMAL(0),
- SCI_DESC_MULTI(1, 0, 0),
- SCI_DESC_MULTI(1, 0, 1),
-};
-
-struct SerialHardware* ser_hw_getdesc(int unit)
-{
- ASSERT(unit < countof(SCIDescs));
- return &SCIDescs[unit].hw;
-}
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