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Basic SCI support

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1152 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2008-11-07 16:28:17 +00:00
parent 0a5d9e9262
commit 1e23712132
7 changed files with 1107 additions and 155 deletions
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26
arch/sh/include/sh1/irq.h
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@ -165,19 +165,25 @@
/* SCI */
#define SH1_ERI_IRQ_OFFSET (0) /* ERI0 */
#define SH1_RXI_IRQ_OFFSET (1) /* RxI0 */
#define SH1_TXI_IRQ_OFFSET (2) /* TxI0 */
#define SH1_TEI_IRQ_OFFSET (3) /* TEI0 */
#define SH1_SCI_NIRQS (4)
#define SH1_SCI0_IRQ (SH1_LASTITU_IRQ+1) /* SCI0 */
#define SH1_ERI0_IRQ (SH1_SCI0_IRQ+0) /* ERI0 */
#define SH1_RXI0_IRQ (SH1_SCI0_IRQ+1) /* RxI0 */
#define SH1_TXI0_IRQ (SH1_SCI0_IRQ+2) /* TxI0 */
#define SH1_TEI0_IRQ (SH1_SCI0_IRQ+3) /* TEI0 */
#define SH1_ERI0_IRQ (SH1_SCI0_IRQ+SH1_ERI_IRQ_OFFSET) /* ERI0 */
#define SH1_RXI0_IRQ (SH1_SCI0_IRQ+SH1_RXI_IRQ_OFFSET) /* RxI0 */
#define SH1_TXI0_IRQ (SH1_SCI0_IRQ+SH1_TXI_IRQ_OFFSET) /* TxI0 */
#define SH1_TEI0_IRQ (SH1_SCI0_IRQ+SH1_TEI_IRQ_OFFSET) /* TEI0 */
#define SH1_SCI1_IRQ (SH1_LASTITU_IRQ+5) /* SCI1 */
#define SH1_ERI1_IRQ (SH1_SCI1_IRQ+0) /* ERI1 */
#define SH1_RXI1_IRQ (SH1_SCI1_IRQ+1) /* RxI1 */
#define SH1_TXI1_IRQ (SH1_SCI1_IRQ+2) /* TxI1 */
#define SH1_TEI1_IRQ (SH1_SCI1_IRQ+3) /* TEI1 */
#define SH1_SCI1_IRQ (SH1_SCI0_IRQ+SH1_SCI_NIRQS) /* SCI1 */
#define SH1_ERI1_IRQ (SH1_SCI1_IRQ+SH1_ERI_IRQ_OFFSET) /* ERI1 */
#define SH1_RXI1_IRQ (SH1_SCI1_IRQ+SH1_RXI_IRQ_OFFSET) /* RxI1 */
#define SH1_TXI1_IRQ (SH1_SCI1_IRQ+SH1_TXI_IRQ_OFFSET) /* TxI1 */
#define SH1_TEI1_IRQ (SH1_SCI1_IRQ+SH1_TEI_IRQ_OFFSET) /* TEI1 */
#define SH1_LASTSCI_IRQ (SH1_LASTITU_IRQ+9)
#define SH1_LASTSCI_IRQ (SH1_SCI1_IRQ+SH1_SCI_NIRQS)
#define SH1_PEI_IRQ (SH1_LASTSCI_IRQ+1) /* Parity control unit PEI */
#define SH1_ADITI_IRQ (SH1_LASTSCI_IRQ+2) /* A/D ITI */

2
arch/sh/src/common/up_internal.h
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@ -52,7 +52,7 @@
#undef CONFIG_SUPPRESS_INTERRUPTS /* DEFINED: Do not enable interrupts */
#undef CONFIG_SUPPRESS_TIMER_INTS /* DEFINED: No timer */
#undef CONFIG_SUPPRESS_SERIAL_INTS /* DEFINED: Console will poll */
#undef CONFIG_SUPPRESS_UART_CONFIG /* DEFINED: Do not reconfig UART */
#undef CONFIG_SUPPRESS_SCI_CONFIG /* DEFINED: Do not reconfig SCI */
#undef CONFIG_DUMP_ON_EXIT /* DEFINED: Dump task state on exit */
/* Determine which (if any) console driver to use */

2
arch/sh/src/sh1/Make.defs
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@ -47,7 +47,7 @@ CMN_CSRCS += up_schedulesigaction.c up_sigdeliver.c
endif
CHIP_ASRCS =
CHIP_CSRCS = sh1_lowputc.c sh1_irq.c sh1_timerisr.c
CHIP_CSRCS = sh1_lowputc.c sh1_irq.c sh1_timerisr.c sh1_serial.c
ifeq ($(CONFIG_USBDEV),y)
CHIP_CSRCS +=

4
arch/sh/src/sh1/chip.h
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@ -43,6 +43,10 @@
#include <nuttx/config.h>
#include <sys/types.h>
#ifdef CONFIG_ARCH_SH7032
# include "sh1_703x.h"
#endif
/************************************************************************************
* Definitions
************************************************************************************/

51
arch/sh/src/sh1/sh1_703x.h
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@ -296,12 +296,13 @@
#define SH1_SCISCR_SISOUT2 (0x01) /* Internal clock, SCK pin used for clock output */
#define SH1_SCISCR_SXSIN1 (0x02) /* External clock, SCK pin used for clock input */
#define SH1_SCISCR_SXSIN2 (0x03) /* External clock, SCK pin used for clock input */
#define SH1_SCISCR_TEIE (0x04) /* Bit 2: Transmit end interrupt enable */
#define SH1_SCISCR_MPIE (0x08) /* Bit 3: Multiprocessor interrupt enable */
#define SH1_SCISCR_RE (0x10) /* Bit 4: Receiver enable */
#define SH1_SCISCR_TE (0x20) /* Bit 5: Transmitter enable */
#define SH1_SCISCR_RIE (0x40) /* Bit 6: Recieve-data-full interrupt enable */
#define SH1_SCISCR_TIE (Ox80) /* Bit 7: Transmit-data-empty interrupt enable */
#define SH1_SCISCR_TEIE (0x04) /* Bit 2: 1=Transmit end interrupt enable */
#define SH1_SCISCR_MPIE (0x08) /* Bit 3: 1=Multiprocessor interrupt enable */
#define SH1_SCISCR_RE (0x10) /* Bit 4: 1=Receiver enable */
#define SH1_SCISCR_TE (0x20) /* Bit 5: 1=Transmitter enable */
#define SH1_SCISCR_RIE (0x40) /* Bit 6: 1=Recieve-data-full interrupt enable */
#define SH1_SCISCR_TIE (Ox80) /* Bit 7: 1=Transmit-data-empty interrupt enable */
#define SH1_SCISCR_ALLINTS (0xcc)
#define SH1_SCISSR_MPBT (0x01) /* Bit 0: Multi-processor Bit in Transmit data */
#define SH1_SCISSR_MPB (0x02) /* Bit 1: Multi-processor Bit in receive data */
@ -314,47 +315,47 @@
/* Interrupt Controller (INTC) */
#define SH1_IPRA_IRQ3MASK (0x000f) /* Bits 0-3: IRQ3
#define SH1_IPRA_IRQ3MASK (0x000f) /* Bits 0-3: IRQ3 */
#define SH1_IPRA_IRQ3SHIFT (0)
#define SH1_IPRA_IRQ2MASK (0x00f0) /* Bits 4-7: IRQ2
#define SH1_IPRA_IRQ2MASK (0x00f0) /* Bits 4-7: IRQ2 */
#define SH1_IPRA_IRQ2SHIFT (4)
#define SH1_IPRA_IRQ1MASK (0x0f00) /* Bits 8-11: IRQ1
#define SH1_IPRA_IRQ1MASK (0x0f00) /* Bits 8-11: IRQ1 */
#define SH1_IPRA_IRQ1SHIFT (8)
#define SH1_IPRA_IRQ0MASK (0xf000) /* Bits 12-15: IRQ0
#define SH1_IPRA_IRQ0MASK (0xf000) /* Bits 12-15: IRQ0 */
#define SH1_IPRA_IRQ0SHIFT (12)
#define SH1_IPRB_IRQ7MASK (0x000f) /* Bits 0-3: IRQ7
#define SH1_IPRB_IRQ7MASK (0x000f) /* Bits 0-3: IRQ7 */
#define SH1_IPRB_IRQ7SHIFT (0)
#define SH1_IPRB_IRQ6MASK (0x00f0) /* Bits 4-7: IRQ6
#define SH1_IPRB_IRQ6MASK (0x00f0) /* Bits 4-7: IRQ6 */
#define SH1_IPRB_IRQ6SHIFT (4)
#define SH1_IPRB_IRQ5MASK (0x0f00) /* Bits 8-11: IRQ5
#define SH1_IPRB_IRQ5MASK (0x0f00) /* Bits 8-11: IRQ5 */
#define SH1_IPRB_IRQ5SHIFT (8)
#define SH1_IPRB_IRQ4MASK (0xf000) /* Bits 12-15: IRQ4
#define SH1_IPRB_IRQ4MASK (0xf000) /* Bits 12-15: IRQ4 */
#define SH1_IPRB_IRQ4SHIFT (12)
#define SH1_IPRC_ITU1MASK (0x000f) /* Bits 0-3: ITU1
#define SH1_IPRC_ITU1MASK (0x000f) /* Bits 0-3: ITU1 */
#define SH1_IPRC_ITU1SHIFT (0)
#define SH1_IPRC_ITU0MASK (0x00f0) /* Bits 4-7: ITU0
#define SH1_IPRC_ITU0MASK (0x00f0) /* Bits 4-7: ITU0 */
#define SH1_IPRC_ITU0SHIFT (4)
#define SH1_IPRC_DM23MASK (0x0f00) /* Bits 8-11: DMAC2,3
#define SH1_IPRC_DM23MASK (0x0f00) /* Bits 8-11: DMAC2,3 */
#define SH1_IPRC_DM23SHIFT (8)
#define SH1_IPRC_DM01MASK (0xf000) /* Bits 12-15: DMAC0,1
#define SH1_IPRC_DM01MASK (0xf000) /* Bits 12-15: DMAC0,1 */
#define SH1_IPRC_DM01SHIFT (12)
#define SH1_IPRD_SCI0MASK (0x000f) /* Bits 0-3: SCI0
#define SH1_IPRD_SCI0MASK (0x000f) /* Bits 0-3: SCI0 */
#define SH1_IPRD_SCI0SHIFT (0)
#define SH1_IPRD_ITU4MASK (0x00f0) /* Bits 4-7: ITU4
#define SH1_IPRD_ITU4MASK (0x00f0) /* Bits 4-7: ITU4 */
#define SH1_IPRD_ITU4SHIFT (4)
#define SH1_IPRD_ITU3MASK (0x0f00) /* Bits 8-11: ITU3
#define SH1_IPRD_ITU3MASK (0x0f00) /* Bits 8-11: ITU3 */
#define SH1_IPRD_ITU3SHIFT (8)
#define SH1_IPRD_ITU2MASK (0xf000) /* Bits 12-15: ITU2
#define SH1_IPRD_ITU2MASK (0xf000) /* Bits 12-15: ITU2 */
#define SH1_IPRD_ITU2SHIFT (12)
#define SH1_IPRE_WDRFMASK (0x00f0) /* Bits 4-7: WDT, REF
#define SH1_IPRE_WDRFMASK (0x00f0) /* Bits 4-7: WDT, REF */
#define SH1_IPRE_WDRFSHIFT (4)
#define SH1_IPRE_PRADMASK (0x0f00) /* Bits 8-11: PRT, A/D
#define SH1_IPRE_PRADMASK (0x0f00) /* Bits 8-11: PRT, A/D */
#define SH1_IPRE_PRADSHIFT (8)
#define SH1_IPRE_SCI1MASK (0xf000) /* Bits 12-15: SCI1
#define SH1_IPRE_SCI1MASK (0xf000) /* Bits 12-15: SCI1 */
#define SH1_IPRE_SCI1SHIFT (12)
#define SH1_ICR_IRQ7S (0x0001) /* Bits 0: Interrupt on falling edge of IRQ7 input */

154
arch/sh/src/sh1/sh1_lowputc.c
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@ -40,10 +40,13 @@
#include <nuttx/config.h>
#include <sys/types.h>
#include <nuttx/arch.h>
#include "up_internal.h"
#include "up_arch.h"
#include "chip.h"
#include "up_internal.h"
/**************************************************************************
* Private Definitions
@ -53,7 +56,7 @@
/* Is there a serial console? */
#if defined(CONFIG_UART0_SERIAL_CONSOLE) || defined(CONFIG_UART1_SERIAL_CONSOLE)
#if defined(CONFIG_SCI0_SERIAL_CONSOLE) || defined(CONFIG_SCI1_SERIAL_CONSOLE)
# define HAVE_CONSOLE
#else
# undef HAVE_CONSOLE
@ -61,46 +64,80 @@
/* Select UART parameters for the selected console */
#if defined(CONFIG_UART0_SERIAL_CONSOLE)
# define SH1_UART_BASE
# define SH1_UART_BAUD CONFIG_UART0_BAUD
# define SH1_UART_BITS CONFIG_UART0_BITS
# define SH1_UART_PARITY CONFIG_UART0_PARITY
# define SH1_UART_2STOP CONFIG_UART0_2STOP
#elif defined(CONFIG_UART1_SERIAL_CONSOLE)
# define SH1_UART_BASE
# define SH1_UART_BAUD CONFIG_UART1_BAUD
# define SH1_UART_BITS CONFIG_UART1_BITS
# define SH1_UART_PARITY CONFIG_UART1_PARITY
# define SH1_UART_2STOP CONFIG_UART1_2STOP
#if defined(CONFIG_SCI0_SERIAL_CONSOLE)
# define SH1_SCI_BASE SH1_SCI0_BASE
# define SH1_SCI_BAUD CONFIG_SCI0_BAUD
# define SH1_SCI_BITS CONFIG_SCI0_BITS
# define SH1_SCI_PARITY CONFIG_SCI0_PARITY
# define SH1_SCI_2STOP CONFIG_SCI0_2STOP
#elif defined(CONFIG_SCI1_SERIAL_CONSOLE)
# define SH1_SCI_BASE SH1_SCI1_BASE
# define SH1_SCI_BAUD CONFIG_SCI1_BAUD
# define SH1_SCI_BITS CONFIG_SCI1_BITS
# define SH1_SCI_PARITY CONFIG_SCI1_PARITY
# define SH1_SCI_2STOP CONFIG_SCI1_2STOP
#else
# error "No CONFIG_UARTn_SERIAL_CONSOLE Setting"
# error "No CONFIG_SCIn_SERIAL_CONSOLE Setting"
#endif
/* Get mode setting */
#if SH1_UART_BITS == 7
# define SH1_UARTCR_MODE
#elif SH1_UART_BITS == 8
# define SH1_UARTCR_MODE SH1_UARTCR_MODE8BITP
#if SH1_SCI_BITS == 7
# define SH1_SMR_MODE SH1_SCISMR_CHR
#elif SH1_SCI_BITS == 8
# define SH1_SMR_MODE (0)
#else
# error "Number of bits not supported"
#endif
#if SH1_UART_PARITY == 0 || SH1_UART_PARITY == 2
# define SH1_UARTCR_PARITY
#elif SH1_UART_PARITY == 1
# define SH1_UARTCR_PARITY SH1_UARTCR_PARITYODD
#if SH1_SCI_PARITY == 0
# define SH1_SMR_PARITY (0)
#elif SH1_SCI_PARITY == 1
# define SH1_SMR_PARITY (SH1_SCISMR_PE|SH1_SCISMR_OE)
#elif SH1_SCI_PARITY == 2
# define SH1_SMR_PARITY SH1_SCISMR_PE
#else
# error "Invalid parity selection"
#endif
#if SH1_UART_2STOP != 0
# define SH1_UARTCR_STOP
#if SH1_SCI_2STOP != 0
# define SH1_SMR_STOP SH1_SCISMR_STOP
#else
# define SH1_UARTCR_STOP
# define SH1_SMR_STOP (0)
#endif
/* The full SMR setting also includes internal clocking with no divisor,
* aysnchronous operation and multiprocessor disabled:
*/
#define SH1_SMR_VALUE (SH1_SMR_MODE|SH1_SMR_PARITY|SH1_SMR_STOP)
/* Clocking ***************************************************************/
/* The calculation of the BRR to achieve the desired BAUD is given by the
* following formula:
*
* brr = (f/(64*2**(2n-1)*b))-1
*
* Where:
*
* b = bit rate
* f = frequency (Hz)
* n = divider setting (0, 1, 2, 3)
*
* For n == 0, this simplifies to:
*
* brr = (f/(32*b))-1
*
* For example, if the processor is clocked at 10 MHz and 9600 is the
* desired BAUD:
*
* brr = 10,000,000 / (32 * 9600) - 1 = 31.552 (or 32 after rounding)
*/
#define SH1_DIVISOR (32 * SH1_SCI_BAUD)
#define SH1_BRR (((SH1_CLOCK + (SH1_DIVISOR/2))/SH1_DIVISOR)-1)
/**************************************************************************
* Private Types
**************************************************************************/
@ -121,6 +158,19 @@
* Private Functions
**************************************************************************/
/**************************************************************************
* Name: up_txready
*
* Description:
* Return TRUE of the Transmit Data Register is empty
*
**************************************************************************/
int inline up_txready(void)
{
return getreg8(SH1_SCI_BASE + SH1_SCI_SSR_OFFSET) & SH1_SCISSR_TDRE;
}
/**************************************************************************
* Public Functions
**************************************************************************/
@ -136,7 +186,21 @@
void up_lowputc(char ch)
{
#ifdef HAVE_CONSOLE
# warning "To be provided"
ubyte ssr;
/* Wait until the TDR is avaible */
while (!up_txready());
/* Write the data to the TDR */
putreg8(ch, SH1_SCI_BASE + SH1_SCI_TDR_OFFSET);
/* Clear the TDRE bit in the SSR */
ssr = getreg8(SH1_SCI_BASE + SH1_SCI_SSR_OFFSET);
ssr &= ~SH1_SCISSR_TDRE;
putreg8(ssr, SH1_SCI_BASE + SH1_SCI_SSR_OFFSET);
#endif
}
@ -152,9 +216,39 @@ void up_lowputc(char ch)
void up_lowsetup(void)
{
#ifdef HAVE_CONSOLE
# warning "To be provided"
#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_SCI_CONFIG)
ubyte scr;
/* Disable the transmitter and receiver */
scr = getreg8(SH1_SCI_BASE + SH1_SCI_SCR_OFFSET);
scr &= ~(SH1_SCISCR_TE | SH1_SCISCR_RE);
putreg8(scr, SH1_SCI_BASE + SH1_SCI_SCR_OFFSET);
/* Set communication to be asynchronous with the configured number of data
* bits, parity, and stop bits. Use the internal clock (undivided)
*/
putreg8(SH1_SMR_VALUE, SH1_SCI_BASE + SH1_SCI_SMR_OFFSET);
/* Set the baud based on the configured console baud and configured
* system clock.
*/
putreg8(SH1_BRR, SH1_SCI_BASE + SH1_SCI_BRR_OFFSET);
/* Select the internal clock source as input */
scr &= ~SH1_SCISCR_CKEMASK;
putreg8(scr, SH1_SCI_BASE + SH1_SCI_SCR_OFFSET);
/* Wait a bit for the clocking to settle */
up_udelay(100);
/* Then enable the transmitter and reciever */
scr |= (SH1_SCISCR_TE | SH1_SCISCR_RE);
putreg8(scr, SH1_SCI_BASE + SH1_SCI_SCR_OFFSET);
#endif
}

847
arch/sh/src/sh1/sh1_serial.c Normal file
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@ -0,0 +1,847 @@
/****************************************************************************
* arch/sh/src/sh1/sh1_serial.c
*
* Copyright (C) 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <unistd.h>
#include <semaphore.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/serial.h>
#include <arch/serial.h>
#include "chip.h"
#include "up_arch.h"
#include "up_internal.h"
#ifdef CONFIG_USE_SERIALDRIVER
/****************************************************************************
* Definitions
****************************************************************************/
/* Some sanity checks *******************************************************/
/* Is there a serial console? */
#if defined(CONFIG_SCI0_SERIAL_CONSOLE) || defined(CONFIG_SCI1_SERIAL_CONSOLE)
# define HAVE_CONSOLE
#else
# undef HAVE_CONSOLE
#endif
/* Which SCI with be tty0/console and which tty1? */
#if defined(CONFIG_SCI0_SERIAL_CONSOLE) || !defined(CONFIG_SCI1_SERIAL_CONSOLE)
# undef CONFIG_SCI1_SERIAL_CONSOLE
# ifdef CONFIG_SCI0_SERIAL_CONSOLE
# define CONSOLE_DEV g_sci0port /* SCI0 is console */
# endif
# define TTYS0_DEV g_sci0port /* SCI0 is tty0 */
# define TTYS1_DEV g_sci1port /* SCI1 is tty1 */
#else
# define CONSOLE_DEV g_sci1port /* SCI1 is console */
# define TTYS0_DEV g_sci1port /* SCI1 is tty0 */
# define TTYS1_DEV g_sci0port /* SCI0 is tty1 */
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint32 scibase; /* Base address of SCI registers */
uint32 baud; /* Configured baud */
ubyte scr; /* Saved SCR value */
ubyte ssr; /* Saved SR value (only used during interrupt processing) */
ubyte irq; /* IRQ associated with this SCI */
ubyte parity; /* 0=none, 1=odd, 2=even */
ubyte bits; /* Number of bits (7 or 8) */
boolean stopbits2; /* TRUE: Configure with 2 stop bits instead of 1 */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int up_setup(struct uart_dev_s *dev);
static void up_shutdown(struct uart_dev_s *dev);
static int up_attach(struct uart_dev_s *dev);
static void up_detach(struct uart_dev_s *dev);
static int up_interrupt(int irq, void *context);
static int up_ioctl(struct file *filep, int cmd, unsigned long arg);
static int up_receive(struct uart_dev_s *dev, uint32 *status);
static void up_rxint(struct uart_dev_s *dev, boolean enable);
static boolean up_rxavailable(struct uart_dev_s *dev);
static void up_send(struct uart_dev_s *dev, int ch);
static void up_txint(struct uart_dev_s *dev, boolean enable);
static boolean up_txready(struct uart_dev_s *dev);
/****************************************************************************
* Private Variables
****************************************************************************/
struct uart_ops_s g_sci_ops =
{
.setup = up_setup,
.shutdown = up_shutdown,
.attach = up_attach,
.detach = up_detach,
.ioctl = up_ioctl,
.receive = up_receive,
.rxint = up_rxint,
.rxavailable = up_rxavailable,
.send = up_send,
.txint = up_txint,
.txready = up_txready,
.txempty = up_txready,
};
/* I/O buffers */
static char g_sci0rxbuffer[CONFIG_SCI0_RXBUFSIZE];
static char g_sci0txbuffer[CONFIG_SCI0_TXBUFSIZE];
static char g_sci1rxbuffer[CONFIG_SCI1_RXBUFSIZE];
static char g_sci1txbuffer[CONFIG_SCI1_TXBUFSIZE];
/* This describes the state of the SH1 sci0 port. */
static struct up_dev_s g_sci0priv =
{
.scibase = SH1_SCI0_BASE,
.baud = CONFIG_SCI0_BAUD,
.irq = SH1_SCI0_IRQ,
.parity = CONFIG_SCI0_PARITY,
.bits = CONFIG_SCI0_BITS,
.stopbits2 = CONFIG_SCI0_2STOP,
};
static uart_dev_t g_sci0port =
{
.recv =
{
.size = CONFIG_SCI0_RXBUFSIZE,
.buffer = g_sci0rxbuffer,
},
.xmit =
{
.size = CONFIG_SCI0_TXBUFSIZE,
.buffer = g_sci0txbuffer,
},
.ops = &g_sci_ops,
.priv = &g_sci0priv,
};
/* This describes the state of the SH1 sci1 port. */
static struct up_dev_s g_sci1priv =
{
.scibase = SH1_SCI1_BASE,
.baud = CONFIG_SCI1_BAUD,
.irq = SH1_SCI1_IRQ,
.parity = CONFIG_SCI1_PARITY,
.bits = CONFIG_SCI1_BITS,
.stopbits2 = CONFIG_SCI1_2STOP,
};
static uart_dev_t g_sci1port =
{
.recv =
{
.size = CONFIG_SCI1_RXBUFSIZE,
.buffer = g_sci1rxbuffer,
},
.xmit =
{
.size = CONFIG_SCI1_TXBUFSIZE,
.buffer = g_sci1txbuffer,
},
.ops = &g_sci_ops,
.priv = &g_sci1priv,
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialin
****************************************************************************/
static inline ubyte up_serialin(struct up_dev_s *priv, int offset)
{
return getreg8(priv->scibase + offset);
}
/****************************************************************************
* Name: up_serialout
****************************************************************************/
static inline void up_serialout(struct up_dev_s *priv, int offset, ubyte value)
{
putreg8(value, priv->scibase + offset);
}
/****************************************************************************
* Name: up_disableuartint
****************************************************************************/
static inline void up_disableuartint(struct up_dev_s *priv, ubyte *scr)
{
/* Return a copy of the current scr settings */
if (scr)
{
*scr = priv->scr;
}
/* The disable all interrupts */
priv->scr |= SH1_SCISCR_ALLINTS;
up_serialout(priv, SH1_SCI_SCR_OFFSET, priv->scr);
}
/****************************************************************************
* Name: up_restoreuartint
****************************************************************************/
static inline void up_restoreuartint(struct up_dev_s *priv, ubyte scr)
{
/* Set the interrupt bits in the scr value */
priv->scr &= ~SH1_SCISCR_ALLINTS;
priv->scr |= (scr & SH1_SCISCR_ALLINTS);
up_serialout(priv, SH1_SCI_SCR_OFFSET, priv->scr);
}
/****************************************************************************
* Name: up_waittxready
****************************************************************************/
#ifdef HAVE_CONSOLE
static inline void up_waittxready(struct up_dev_s *priv)
{
int tmp;
/* Limit how long we will wait for the TDR empty condition */
for (tmp = 1000 ; tmp > 0 ; tmp--)
{
/* Check if the TDR is empty. The TDR becomes empty when: (1) the
* the chip is reset or enters standby mode, (2) the TE bit in the SCR
* is cleared, or (3) the current TDR contents are loaded in the TSR so
* that new data can be written in the TDR.
*/
if ((up_serialin(priv, SH1_SCI_SSR_OFFSET) & SH1_SCISSR_TDRE) != 0)
{
/* The TDR is empty... return */
break;
}
}
}
#endif
/****************************************************************************
* Name: up_setbrr
*
* Description:
* Calculate the correct value for the BRR given the configured frequency
* and the desired BAUD settings.
*
****************************************************************************/
static inline void up_setbrr(struct up_dev_s *priv, unsigned int baud)
{
/* The calculation of the BRR to achieve the desired BAUD is given by the
* following formula:
*
* brr = (f/(64*2**(2n-1)*b))-1
*
* Where:
*
* b = bit rate
* f = frequency (Hz)
* n = divider setting (0, 1, 2, 3)
*
* For n == 0 and with rounding this becomes:
*
* brr = ((((f+16)/32) +(b/2)) / b) - 1
*
* For example, if the processor is clocked at 10 MHz and 9600 is the
* desired BAUD:
*
* brr = ((10,000,016/32) + 4800) / 9600 -1
* = 32
*/
uint32 brr = ((((SH1_CLOCK + 16) / 32) + (baud >> 1)) / baud) - 1;
up_serialout(priv, SH1_SCI_BRR_OFFSET, (uint16)brr);
}
/****************************************************************************
* Name: up_setup
*
* Description:
* Configure the SCI baud, bits, parity, fifos, etc. This
* method is called the first time that the serial port is
* opened.
*
****************************************************************************/
static int up_setup(struct uart_dev_s *dev)
{
#ifndef CONFIG_SUPPRESS_SCI_CONFIG
ubyte smr;
/* Disable the transmitter and receiver */
priv->scr = up_serialin(priv, SH1_SCI_SCR_OFFSET);
priv->scr &= ~(SH1_SCISCR_TE | SH1_SCISCR_RE);
up_serialout(priv, SH1_SCI_SCR_OFFSET, priv->scr);
/* Set communication to be asynchronous with the configured number of data
* bits, parity, and stop bits. Use the internal clock (undivided)
*/
smr = 0;
if (priv->bits == 7)
{
smr |= SH1_SCISMR_CHR;
}
if (parity == 1)
{
smr |= (SH1_SCISMR_PE|SH1_SCISMR_OE);
}
else if (parity == 2)
{
smr |= SH1_SCISMR_PE;
}
if (priv->stopbits2)
{
smr |= SH1_SCISMR_STOP;
}
up_serialout(priv, SH1_SCI_SMR_OFFSET, smr);
/* Set the baud based on the configured console baud and configured
* system clock.
*/
up_setbrr(priv, priv->baud);
/* Select the internal clock source as input */
priv->scr &= ~SH1_SCISCR_CKEMASK;
up_serialout(priv, SH1_SCI_SCR_OFFSET, priv->scr);
/* Wait a bit for the clocking to settle */
up_udelay(100);
/* Then enable the transmitter and reciever */
priv->scr |= (SH1_SCISCR_TE | SH1_SCISCR_RE);
up_serialout(priv, SH1_SCI_SCR_OFFSET, priv->scr);
#endif
return OK;
}
/****************************************************************************
* Name: up_shutdown
*
* Description:
* Disable the SCI. This method is called when the serial port is closed
*
****************************************************************************/
static void up_shutdown(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
up_disableuartint(priv, NULL);
}
/****************************************************************************
* Name: up_attach
*
* Description:
* Configure the SCI to operation in interrupt driven mode. This method is
* called when the serial port is opened. Normally, this is just after the
* the setup() method is called, however, the serial console may operate in
* a non-interrupt driven mode during the boot phase.
*
* RX and TX interrupts are not enabled when by the attach method (unless the
* hardware supports multiple levels of interrupt enabling). The RX and TX
* interrupts are not enabled until the txint() and rxint() methods are called.
*
****************************************************************************/
static int up_attach(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
int ret;
/* Attach the RDR full IRQ */
ret = irq_attach(priv->irq + , up_interrupt);
if (ret == OK)
{
/* Enable the interrupt
*/
up_enable_irq(priv->irq);
}
/* Enable the RDR full and TDR empty interrupts at the interupt controller
* (RX and TX interrupts are still disabled in the SCI)
*/
if (ret == OK)
{
up_enable_irq(priv->irq);
up_enable_irq(priv->irq);
}
return ret;
}
/****************************************************************************
* Name: up_detach
*
* Description:
* Detach SCI interrupts. This method is called when the serial port is
* closed normally just before the shutdown method is called. The exception is
* the serial console which is never shutdown.
*
****************************************************************************/
static void up_detach(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
up_disable_irq(priv->irq);
irq_detach(priv->irq);
}
/****************************************************************************
* Name: up_interrupt
*
* Description:
* This is the SCI interrupt handler. It will be invoked
* when an interrupt received on the 'irq' It should call
* uart_transmitchars or uart_receivechar to perform the
* appropriate data transfers. The interrupt handling logic\
* must be able to map the 'irq' number into the approprite
* uart_dev_s structure in order to call these functions.
*
****************************************************************************/
static int up_interrupt(int irq, void *context)
{
struct uart_dev_s *dev = NULL;
struct up_dev_s *priv;
int passes;
boolean handled;
#ifdef CONFIG_SH1_SCI0
if (g_sci0priv.irq == irq)
{
dev = &g_sci0port;
}
else
#endif
#ifdef CONFIG_SH1_SCI1
if (g_sci1priv.irq == irq)
{
dev = &g_sci1port;
}
else
#endif
#ifdef CONFIG_SH1_SCI2
if (g_sci2priv.irq == irq)
{
dev = &g_sci2port;
}
else
#endif
#ifdef CONFIG_SH1_SCI3
if (g_sci3priv.irq == irq)
{
dev = &g_sci3port;
}
else
#endif
{
PANIC(OSERR_INTERNAL);
}
priv = (struct up_dev_s*)dev->priv;
/* Loop until there are no characters to be transferred or,
* until we have been looping for a long time.
*/
for (passes = 0; passes < 256 && handled; passes++)
{
handled = FALSE;
/* Get the current SCI status */
priv->ssr = up_serialin(priv, SH1_SCI_SSR_OFFSET);
/* Handle incoming, receive bytes (with or without timeout) */
if ((priv->ssr & SH1_SCISR_RNE) != 0)
{
/* Rx buffer not empty ... process incoming bytes */
uart_recvchars(dev);
}
/* Handle outgoing, transmit bytes */
if ((priv->ssr & SH1_SCISR_TF) == 0)
{
/* Tx FIFO not full ... process outgoing bytes */
uart_xmitchars(dev);
}
}
return OK;
}
/****************************************************************************
* Name: up_ioctl
*
* Description:
* All ioctl calls will be routed through this method
*
****************************************************************************/
static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
{
struct inode *inode = filep->f_inode;
struct uart_dev_s *dev = inode->i_private;
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
int ret = OK;
switch (cmd)
{
case TIOCSERGSTRUCT:
{
struct up_dev_s *user = (struct up_dev_s*)arg;
if (!user)
{
*get_errno_ptr() = EINVAL;
ret = ERROR;
}
else
{
memcpy(user, dev, sizeof(struct up_dev_s));
}
}
break;
default:
*get_errno_ptr() = ENOTTY;
ret = ERROR;
break;
}
return ret;
}
/****************************************************************************
* Name: up_receive
*
* Description:
* Called (usually) from the interrupt level to receive one
* character from the SCI. Error bits associated with the
* receipt are provided in the the return 'status'.
*
****************************************************************************/
static int up_receive(struct uart_dev_s *dev, uint32 *status)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint16 rxbufr;
rxbufr = up_serialin(priv, SH1_SCI_RXBUFR_OFFSET);
*status = (uint32)priv->ssr << 16 | rxbufr;
return rxbufr & 0xff;
}
/****************************************************************************
* Name: up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void up_rxint(struct uart_dev_s *dev, boolean enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
if (enable)
{
/* Enable the RDR full interrupt */
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->scr |= SH1_SCISCR_RIE;
#endif
}
else
{
/* Disable the RDR full interrupt */
priv->scr &= ~SH1_SCISCR_RIE;
}
/* Write the modified SCR value to hardware */
up_serialout(priv, SH1_SCI_SCR_OFFSET, priv->scr);
}
/****************************************************************************
* Name: up_rxavailable
*
* Description:
* Return TRUE if the RDR is not empty
*
****************************************************************************/
static boolean up_rxavailable(struct uart_dev_s *dev)
{
/* Return true if the RDR full bit is set in the SSR */
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, SH1_SCI_SSR_OFFSET) & SH1_SCISSR_RDRF) != 0);
}
/****************************************************************************
* Name: up_send
*
* Description:
* This method will send one byte on the SCI
*
****************************************************************************/
static void up_send(struct uart_dev_s *dev, int ch)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
/* Write the data to the TDR */
up_serialout(priv, SH1_SCI_BASE + SH1_SCI_TDR_OFFSET, (ubyte)ch);
/* Clear the TDRE bit in the SSR */
ssr = up_serialin(priv, SH1_SCI_SSR_OFFSET);
ssr &= ~SH1_SCISSR_TDRE;
up_serialout(priv, SH1_SCI_BASE + SH1_SCI_SSR_OFFSET, ssr);
}
/****************************************************************************
* Name: up_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void up_txint(struct uart_dev_s *dev, boolean enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
if (enable)
{
/* Enable the TDR empty interrupt */
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->scr |= SH1_SCISCR_TIE;
#endif
}
else
{
/* Disable the TDR empty interrupt */
priv->scr &= ~SH1_SCISCR_TIE;
}
/* Write the modified SCR value to hardware */
up_serialout(priv, SH1_SCI_SCR_OFFSET, priv->scr);
}
/****************************************************************************
* Name: up_txready
*
* Description:
* Return TRUE if the TDR is empty
*
****************************************************************************/
static boolean up_txready(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return (up_serialin(priv, SH1_SCI_SSR_OFFSET) & SH1_SCISSR_TDRE) != 0;
}
/****************************************************************************
* Public Funtions
****************************************************************************/
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Performs the low level SCI initialization early in
* debug so that the serial console will be available
* during bootup. This must be called before up_serialinit.
*
****************************************************************************/
void up_earlyserialinit(void)
{
/* NOTE: All GPIO configuration for the SCIs was performed in
* up_lowsetup
*/
/* Disable all UARTS */
up_disableuartint(TTYS0_DEV.priv, NULL);
up_disableuartint(TTYS1_DEV.priv, NULL);
/* Configuration whichever one is the console */
#ifdef HAVE_CONSOLE
CONSOLE_DEV.isconsole = TRUE;
up_setup(&CONSOLE_DEV);
#endif
}
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Register serial console and serial ports. This assumes
* that up_earlyserialinit was called previously.
*
****************************************************************************/
void up_serialinit(void)
{
/* Register the console */
#ifdef HAVE_CONSOLE
(void)uart_register("/dev/console", &CONSOLE_DEV);
#endif
/* Register all SCIs */
(void)uart_register("/dev/ttyS0", &TTYS0_DEV);
(void)uart_register("/dev/ttyS1", &TTYS1_DEV);
}
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#ifdef HAVE_CONSOLE
struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv;
ubyte scr;
up_disableuartint(priv, &scr);
up_waittxready(priv);
up_serialout(priv, SH1_SCI_THR_OFFSET, (ubyte)ch);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_waittxready(priv);
up_serialout(priv, SH1_SCI_THR_OFFSET, '\r');
}
up_waittxready(priv);
up_restoreuartint(priv, scr);
#endif
return ch;
}
#else /* CONFIG_USE_SERIALDRIVER */
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#ifdef HAVE_CONSOLE
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
#endif
return ch;
}
#endif /* CONFIG_USE_SERIALDRIVER */