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authorStefan Roese <sr@denx.de>2007-10-22 15:09:59 +0200
committerStefan Roese <sr@denx.de>2007-10-31 21:20:50 +0100
commitad31e40bed042cb670d0036fea96435007afb838 (patch)
treeb26a22f6d327c1fabc858e544e96bcf571fbc69a /cpu/ppc4xx/iop480_uart.c
parent764e7417ee5f6e25b1715720e7d7dd3487109385 (diff)
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ppc4xx: Rework of 4xx serial driver (1)
This patch starts the rework of the PPC4xx serial driver. First we split the file into two seperate files, one 4xx_uart.c with the 405/440 UART handling code and the other one iop480_uart.c with the UART code for the PLX-Tech IOP480 PPC (PPC403 based). Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'cpu/ppc4xx/iop480_uart.c')
-rw-r--r--cpu/ppc4xx/iop480_uart.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/cpu/ppc4xx/iop480_uart.c b/cpu/ppc4xx/iop480_uart.c
new file mode 100644
index 0000000..8dd2267
--- /dev/null
+++ b/cpu/ppc4xx/iop480_uart.c
@@ -0,0 +1,238 @@
+/*
+ * (C) Copyright 2000-2006
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <commproc.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+#include <watchdog.h>
+#include "vecnum.h"
+
+#ifdef CONFIG_SERIAL_MULTI
+#include <serial.h>
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_IOP480
+
+#define SPU_BASE 0x40000000
+
+#define spu_LineStat_rc 0x00 /* Line Status Register (Read/Clear) */
+#define spu_LineStat_w 0x04 /* Line Status Register (Set) */
+#define spu_Handshk_rc 0x08 /* Handshake Status Register (Read/Clear) */
+#define spu_Handshk_w 0x0c /* Handshake Status Register (Set) */
+#define spu_BRateDivh 0x10 /* Baud rate divisor high */
+#define spu_BRateDivl 0x14 /* Baud rate divisor low */
+#define spu_CtlReg 0x18 /* Control Register */
+#define spu_RxCmd 0x1c /* Rx Command Register */
+#define spu_TxCmd 0x20 /* Tx Command Register */
+#define spu_RxBuff 0x24 /* Rx data buffer */
+#define spu_TxBuff 0x24 /* Tx data buffer */
+
+/*-----------------------------------------------------------------------------+
+ | Line Status Register.
+ +-----------------------------------------------------------------------------*/
+#define asyncLSRport1 0x40000000
+#define asyncLSRport1set 0x40000004
+#define asyncLSRDataReady 0x80
+#define asyncLSRFramingError 0x40
+#define asyncLSROverrunError 0x20
+#define asyncLSRParityError 0x10
+#define asyncLSRBreakInterrupt 0x08
+#define asyncLSRTxHoldEmpty 0x04
+#define asyncLSRTxShiftEmpty 0x02
+
+/*-----------------------------------------------------------------------------+
+ | Handshake Status Register.
+ +-----------------------------------------------------------------------------*/
+#define asyncHSRport1 0x40000008
+#define asyncHSRport1set 0x4000000c
+#define asyncHSRDsr 0x80
+#define asyncLSRCts 0x40
+
+/*-----------------------------------------------------------------------------+
+ | Control Register.
+ +-----------------------------------------------------------------------------*/
+#define asyncCRport1 0x40000018
+#define asyncCRNormal 0x00
+#define asyncCRLoopback 0x40
+#define asyncCRAutoEcho 0x80
+#define asyncCRDtr 0x20
+#define asyncCRRts 0x10
+#define asyncCRWordLength7 0x00
+#define asyncCRWordLength8 0x08
+#define asyncCRParityDisable 0x00
+#define asyncCRParityEnable 0x04
+#define asyncCREvenParity 0x00
+#define asyncCROddParity 0x02
+#define asyncCRStopBitsOne 0x00
+#define asyncCRStopBitsTwo 0x01
+#define asyncCRDisableDtrRts 0x00
+
+/*-----------------------------------------------------------------------------+
+ | Receiver Command Register.
+ +-----------------------------------------------------------------------------*/
+#define asyncRCRport1 0x4000001c
+#define asyncRCRDisable 0x00
+#define asyncRCREnable 0x80
+#define asyncRCRIntDisable 0x00
+#define asyncRCRIntEnabled 0x20
+#define asyncRCRDMACh2 0x40
+#define asyncRCRDMACh3 0x60
+#define asyncRCRErrorInt 0x10
+#define asyncRCRPauseEnable 0x08
+
+/*-----------------------------------------------------------------------------+
+ | Transmitter Command Register.
+ +-----------------------------------------------------------------------------*/
+#define asyncTCRport1 0x40000020
+#define asyncTCRDisable 0x00
+#define asyncTCREnable 0x80
+#define asyncTCRIntDisable 0x00
+#define asyncTCRIntEnabled 0x20
+#define asyncTCRDMACh2 0x40
+#define asyncTCRDMACh3 0x60
+#define asyncTCRTxEmpty 0x10
+#define asyncTCRErrorInt 0x08
+#define asyncTCRStopPause 0x04
+#define asyncTCRBreakGen 0x02
+
+/*-----------------------------------------------------------------------------+
+ | Miscellanies defines.
+ +-----------------------------------------------------------------------------*/
+#define asyncTxBufferport1 0x40000024
+#define asyncRxBufferport1 0x40000024
+#define asyncDLABLsbport1 0x40000014
+#define asyncDLABMsbport1 0x40000010
+#define asyncXOFFchar 0x13
+#define asyncXONchar 0x11
+
+/*
+ * Minimal serial functions needed to use one of the SMC ports
+ * as serial console interface.
+ */
+
+int serial_init (void)
+{
+ volatile char val;
+ unsigned short br_reg;
+
+ br_reg = ((((CONFIG_CPUCLOCK * 1000000) / 16) / gd->baudrate) - 1);
+
+ /*
+ * Init onboard UART
+ */
+ out_8((u8 *)SPU_BASE + spu_LineStat_rc, 0x78); /* Clear all bits in Line Status Reg */
+ out_8((u8 *)SPU_BASE + spu_BRateDivl, (br_reg & 0x00ff)); /* Set baud rate divisor... */
+ out_8((u8 *)SPU_BASE + spu_BRateDivh, ((br_reg & 0xff00) >> 8)); /* ... */
+ out_8((u8 *)SPU_BASE + spu_CtlReg, 0x08); /* Set 8 bits, no parity and 1 stop bit */
+ out_8((u8 *)SPU_BASE + spu_RxCmd, 0xb0); /* Enable Rx */
+ out_8((u8 *)SPU_BASE + spu_TxCmd, 0x9c); /* Enable Tx */
+ out_8((u8 *)SPU_BASE + spu_Handshk_rc, 0xff); /* Clear Handshake */
+ val = in_8((u8 *)SPU_BASE + spu_RxBuff); /* Dummy read, to clear receiver */
+
+ return (0);
+}
+
+void serial_setbrg (void)
+{
+ unsigned short br_reg;
+
+ br_reg = ((((CONFIG_CPUCLOCK * 1000000) / 16) / gd->baudrate) - 1);
+
+ out_8((u8 *)SPU_BASE + spu_BRateDivl,
+ (br_reg & 0x00ff)); /* Set baud rate divisor... */
+ out_8((u8 *)SPU_BASE + spu_BRateDivh,
+ ((br_reg & 0xff00) >> 8)); /* ... */
+}
+
+void serial_putc (const char c)
+{
+ if (c == '\n')
+ serial_putc ('\r');
+
+ /* load status from handshake register */
+ if (in_8((u8 *)SPU_BASE + spu_Handshk_rc) != 00)
+ out_8((u8 *)SPU_BASE + spu_Handshk_rc, 0xff); /* Clear Handshake */
+
+ out_8((u8 *)SPU_BASE + spu_TxBuff, c); /* Put char */
+
+ while ((in_8((u8 *)SPU_BASE + spu_LineStat_rc) & 04) != 04) {
+ if (in_8((u8 *)SPU_BASE + spu_Handshk_rc) != 00)
+ out_8((u8 *)SPU_BASE + spu_Handshk_rc, 0xff); /* Clear Handshake */
+ }
+}
+
+void serial_puts (const char *s)
+{
+ while (*s) {
+ serial_putc (*s++);
+ }
+}
+
+int serial_getc ()
+{
+ unsigned char status = 0;
+
+ while (1) {
+ status = in_8((u8 *)asyncLSRport1);
+ if ((status & asyncLSRDataReady) != 0x0) {
+ break;
+ }
+ if ((status & ( asyncLSRFramingError |
+ asyncLSROverrunError |
+ asyncLSRParityError |
+ asyncLSRBreakInterrupt )) != 0) {
+ (void) out_8((u8 *)asyncLSRport1,
+ asyncLSRFramingError |
+ asyncLSROverrunError |
+ asyncLSRParityError |
+ asyncLSRBreakInterrupt );
+ }
+ }
+ return (0x000000ff & (int) in_8((u8 *)asyncRxBufferport1));
+}
+
+int serial_tstc ()
+{
+ unsigned char status;
+
+ status = in_8((u8 *)asyncLSRport1);
+ if ((status & asyncLSRDataReady) != 0x0) {
+ return (1);
+ }
+ if ((status & ( asyncLSRFramingError |
+ asyncLSROverrunError |
+ asyncLSRParityError |
+ asyncLSRBreakInterrupt )) != 0) {
+ (void) out_8((u8 *)asyncLSRport1,
+ asyncLSRFramingError |
+ asyncLSROverrunError |
+ asyncLSRParityError |
+ asyncLSRBreakInterrupt);
+ }
+ return 0;
+}
+
+#endif /* CONFIG_IOP480 */