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authorWolfgang Denk <wd@denx.de>2008-04-08 00:04:39 +0200
committerWolfgang Denk <wd@denx.de>2008-04-08 00:04:39 +0200
commit5c395393cc9b85b14c5481dbcab6b67b54f31622 (patch)
tree888e8cd55173a99f636b19e2813e3dfe6afe3d44 /drivers
parente59af4b611408adcdfb5e19bc5194a7d1f8b4dc3 (diff)
parent280df59a8d62c6e74c281b1cb7e2052df4d6cb00 (diff)
Merge branch 'master' of git://www.denx.de/git/u-boot-sh
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/Makefile3
-rw-r--r--drivers/pci/pci_sh4.c76
-rw-r--r--drivers/pci/pci_sh7751.c199
-rw-r--r--drivers/pci/pci_sh7780.c107
-rw-r--r--drivers/serial/serial_sh.c70
5 files changed, 423 insertions, 32 deletions
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index fe45839466..ad1b7ddb43 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -31,6 +31,9 @@ COBJS-y += pci_auto.o
COBJS-y += pci_indirect.o
COBJS-y += tsi108_pci.o
COBJS-y += w83c553f.o
+COBJS-$(CONFIG_SH4_PCI) += pci_sh4.o
+COBJS-$(CONFIG_SH7751_PCI) +=pci_sh7751.o
+COBJS-$(CONFIG_SH7780_PCI) +=pci_sh7780.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/pci/pci_sh4.c b/drivers/pci/pci_sh4.c
new file mode 100644
index 0000000000..1290c0a799
--- /dev/null
+++ b/drivers/pci/pci_sh4.c
@@ -0,0 +1,76 @@
+/*
+ * SH4 PCI Controller (PCIC) for U-Boot.
+ * (C) Dustin McIntire (dustin@sensoria.com)
+ * (C) 2007,2008 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ * (C) 2008 Yusuke Goda <goda.yusuke@renesas.com>
+ *
+ * u-boot/cpu/sh4/pci-sh4.c
+ *
+ * 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 <asm/processor.h>
+#include <asm/io.h>
+#include <asm/pci.h>
+#include <pci.h>
+
+int pci_sh4_init(struct pci_controller *hose)
+{
+ hose->first_busno = 0;
+ hose->region_count = 0;
+ hose->last_busno = 0xff;
+
+ /* PCI memory space */
+ pci_set_region(hose->regions + 0,
+ CONFIG_PCI_MEM_BUS,
+ CONFIG_PCI_MEM_PHYS,
+ CONFIG_PCI_MEM_SIZE,
+ PCI_REGION_MEM);
+ hose->region_count++;
+
+ /* PCI IO space */
+ pci_set_region(hose->regions + 1,
+ CONFIG_PCI_IO_BUS,
+ CONFIG_PCI_IO_PHYS,
+ CONFIG_PCI_IO_SIZE,
+ PCI_REGION_IO);
+ hose->region_count++;
+
+ udelay(1000);
+
+ pci_set_ops(hose,
+ pci_hose_read_config_byte_via_dword,
+ pci_hose_read_config_word_via_dword,
+ pci_sh4_read_config_dword,
+ pci_hose_write_config_byte_via_dword,
+ pci_hose_write_config_word_via_dword,
+ pci_sh4_write_config_dword);
+
+ pci_register_hose(hose);
+
+ udelay(1000);
+
+#ifdef CONFIG_PCI_SCAN_SHOW
+ printf("PCI: Bus Dev VenId DevId Class Int\n");
+#endif
+ hose->last_busno = pci_hose_scan(hose);
+ return 0;
+}
diff --git a/drivers/pci/pci_sh7751.c b/drivers/pci/pci_sh7751.c
new file mode 100644
index 0000000000..a058e1d37f
--- /dev/null
+++ b/drivers/pci/pci_sh7751.c
@@ -0,0 +1,199 @@
+/*
+ * SH7751 PCI Controller (PCIC) for U-Boot.
+ * (C) Dustin McIntire (dustin@sensoria.com)
+ * (C) 2007,2008 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * 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 <asm/processor.h>
+#include <asm/io.h>
+#include <pci.h>
+
+/* Register addresses and such */
+#define SH7751_BCR1 (vu_long *)0xFF800000
+#define SH7751_BCR2 (vu_short*)0xFF800004
+#define SH7751_WCR1 (vu_long *)0xFF800008
+#define SH7751_WCR2 (vu_long *)0xFF80000C
+#define SH7751_WCR3 (vu_long *)0xFF800010
+#define SH7751_MCR (vu_long *)0xFF800014
+#define SH7751_BCR3 (vu_short*)0xFF800050
+#define SH7751_PCICONF0 (vu_long *)0xFE200000
+#define SH7751_PCICONF1 (vu_long *)0xFE200004
+#define SH7751_PCICONF2 (vu_long *)0xFE200008
+#define SH7751_PCICONF3 (vu_long *)0xFE20000C
+#define SH7751_PCICONF4 (vu_long *)0xFE200010
+#define SH7751_PCICONF5 (vu_long *)0xFE200014
+#define SH7751_PCICONF6 (vu_long *)0xFE200018
+#define SH7751_PCICR (vu_long *)0xFE200100
+#define SH7751_PCILSR0 (vu_long *)0xFE200104
+#define SH7751_PCILSR1 (vu_long *)0xFE200108
+#define SH7751_PCILAR0 (vu_long *)0xFE20010C
+#define SH7751_PCILAR1 (vu_long *)0xFE200110
+#define SH7751_PCIMBR (vu_long *)0xFE2001C4
+#define SH7751_PCIIOBR (vu_long *)0xFE2001C8
+#define SH7751_PCIPINT (vu_long *)0xFE2001CC
+#define SH7751_PCIPINTM (vu_long *)0xFE2001D0
+#define SH7751_PCICLKR (vu_long *)0xFE2001D4
+#define SH7751_PCIBCR1 (vu_long *)0xFE2001E0
+#define SH7751_PCIBCR2 (vu_long *)0xFE2001E4
+#define SH7751_PCIWCR1 (vu_long *)0xFE2001E8
+#define SH7751_PCIWCR2 (vu_long *)0xFE2001EC
+#define SH7751_PCIWCR3 (vu_long *)0xFE2001F0
+#define SH7751_PCIMCR (vu_long *)0xFE2001F4
+#define SH7751_PCIBCR3 (vu_long *)0xFE2001F8
+
+#define BCR1_BREQEN 0x00080000
+#define PCI_SH7751_ID 0x35051054
+#define PCI_SH7751R_ID 0x350E1054
+#define SH7751_PCICONF1_WCC 0x00000080
+#define SH7751_PCICONF1_PER 0x00000040
+#define SH7751_PCICONF1_BUM 0x00000004
+#define SH7751_PCICONF1_MES 0x00000002
+#define SH7751_PCICONF1_CMDS 0x000000C6
+#define SH7751_PCI_HOST_BRIDGE 0x6
+#define SH7751_PCICR_PREFIX 0xa5000000
+#define SH7751_PCICR_PRST 0x00000002
+#define SH7751_PCICR_CFIN 0x00000001
+#define SH7751_PCIPINT_D3 0x00000002
+#define SH7751_PCIPINT_D0 0x00000001
+#define SH7751_PCICLKR_PREFIX 0xa5000000
+
+#define SH7751_PCI_MEM_BASE 0xFD000000
+#define SH7751_PCI_MEM_SIZE 0x01000000
+#define SH7751_PCI_IO_BASE 0xFE240000
+#define SH7751_PCI_IO_SIZE 0x00040000
+
+#define SH7751_CS3_BASE_ADDR 0x0C000000
+#define SH7751_P2CS3_BASE_ADDR 0xAC000000
+
+#define SH7751_PCIPAR (vu_long *)0xFE2001C0
+#define SH7751_PCIPDR (vu_long *)0xFE200220
+
+#define p4_in(addr) *(addr)
+#define p4_out(data,addr) *(addr) = (data)
+
+/* Double word */
+int pci_sh4_read_config_dword(struct pci_controller *hose,
+ pci_dev_t dev, int offset, u32 * value)
+{
+ u32 par_data = 0x80000000 | dev;
+
+ p4_out(par_data | (offset & 0xfc), SH7751_PCIPAR);
+ *value = p4_in(SH7751_PCIPDR);
+
+ return 0;
+}
+
+int pci_sh4_write_config_dword(struct pci_controller *hose,
+ pci_dev_t dev, int offset, u32 * value)
+{
+ u32 par_data = 0x80000000 | dev;
+
+ p4_out(par_data | (offset & 0xfc), SH7751_PCIPAR);
+ p4_out(value, SH7751_PCIPDR);
+
+ return 0;
+}
+
+int pci_sh7751_init(struct pci_controller *hose)
+{
+ /* Double-check that we're a 7751 or 7751R chip */
+ if (p4_in(SH7751_PCICONF0) != PCI_SH7751_ID
+ && p4_in(SH7751_PCICONF0) != PCI_SH7751R_ID) {
+ printf("PCI: Unknown PCI host bridge.\n");
+ return 1;
+ }
+ printf("PCI: SH7751 PCI host bridge found.\n");
+
+ /* Double-check some BSC config settings */
+ /* (Area 3 non-MPX 32-bit, PCI bus pins) */
+ if ((p4_in(SH7751_BCR1) & 0x20008) == 0x20000) {
+ printf("SH7751_BCR1 0x%08X\n", p4_in(SH7751_BCR1));
+ return 2;
+ }
+ if ((p4_in(SH7751_BCR2) & 0xC0) != 0xC0) {
+ printf("SH7751_BCR2 0x%08X\n", p4_in(SH7751_BCR2));
+ return 3;
+ }
+ if (p4_in(SH7751_BCR2) & 0x01) {
+ printf("SH7751_BCR2 0x%08X\n", p4_in(SH7751_BCR2));
+ return 4;
+ }
+
+ /* Force BREQEN in BCR1 to allow PCIC access */
+ p4_out((p4_in(SH7751_BCR1) | BCR1_BREQEN), SH7751_BCR1);
+
+ /* Toggle PCI reset pin */
+ p4_out((SH7751_PCICR_PREFIX | SH7751_PCICR_PRST), SH7751_PCICR);
+ udelay(32);
+ p4_out(SH7751_PCICR_PREFIX, SH7751_PCICR);
+
+ /* Set cmd bits: WCC, PER, BUM, MES */
+ /* (Addr/Data stepping, Parity enabled, Bus Master, Memory enabled) */
+ p4_out(0xfb900047, SH7751_PCICONF1); /* K.Kino */
+
+ /* Define this host as the host bridge */
+ p4_out((SH7751_PCI_HOST_BRIDGE << 24), SH7751_PCICONF2);
+
+ /* Force PCI clock(s) on */
+ p4_out(0, SH7751_PCICLKR);
+ p4_out(0x03, SH7751_PCICLKR);
+
+ /* Clear powerdown IRQs, also mask them (unused) */
+ p4_out((SH7751_PCIPINT_D0 | SH7751_PCIPINT_D3), SH7751_PCIPINT);
+ p4_out(0, SH7751_PCIPINTM);
+
+ p4_out(0xab000001, SH7751_PCICONF4);
+
+ /* Set up target memory mappings (for external DMA access) */
+ /* Map both P0 and P2 range to Area 3 RAM for ease of use */
+ p4_out((64 - 1) << 20, SH7751_PCILSR0);
+ p4_out(SH7751_CS3_BASE_ADDR, SH7751_PCILAR0);
+ p4_out(0, SH7751_PCILSR1);
+ p4_out(0, SH7751_PCILAR1);
+ p4_out(SH7751_CS3_BASE_ADDR, SH7751_PCICONF5);
+ p4_out(0xd0000000, SH7751_PCICONF6);
+
+ /* Map memory window to same address on PCI bus */
+ p4_out(SH7751_PCI_MEM_BASE, SH7751_PCIMBR);
+
+ /* Map IO window to same address on PCI bus */
+ p4_out(0x2000 & 0xfffc0000, SH7751_PCIIOBR);
+
+ /* set BREQEN */
+ p4_out(inl(SH7751_BCR1) | 0x00080000, SH7751_BCR1);
+
+ /* Copy BSC registers into PCI BSC */
+ p4_out(inl(SH7751_BCR1), SH7751_PCIBCR1);
+ p4_out(inl(SH7751_BCR2), SH7751_PCIBCR2);
+ p4_out(inl(SH7751_BCR3), SH7751_PCIBCR3);
+ p4_out(inl(SH7751_WCR1), SH7751_PCIWCR1);
+ p4_out(inl(SH7751_WCR2), SH7751_PCIWCR2);
+ p4_out(inl(SH7751_WCR3), SH7751_PCIWCR3);
+ p4_out(inl(SH7751_MCR), SH7751_PCIMCR);
+
+ /* Finally, set central function init complete */
+ p4_out((SH7751_PCICR_PREFIX | SH7751_PCICR_CFIN), SH7751_PCICR);
+
+ pci_sh4_init(hose);
+
+ return 0;
+}
diff --git a/drivers/pci/pci_sh7780.c b/drivers/pci/pci_sh7780.c
new file mode 100644
index 0000000000..d63d67d2dc
--- /dev/null
+++ b/drivers/pci/pci_sh7780.c
@@ -0,0 +1,107 @@
+/*
+ * SH7780 PCI Controller (PCIC) for U-Boot.
+ * (C) Dustin McIntire (dustin@sensoria.com)
+ * (C) 2007,2008 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ * (C) 2008 Yusuke Goda <goda.yusuke@renesas.com>
+ *
+ * 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 <asm/processor.h>
+#include <asm/io.h>
+#include <pci.h>
+
+#define SH7780_VENDOR_ID 0x1912
+#define SH7780_DEVICE_ID 0x0002
+#define SH7780_PCICR_PREFIX 0xA5000000
+#define SH7780_PCICR_PFCS 0x00000800
+#define SH7780_PCICR_FTO 0x00000400
+#define SH7780_PCICR_PFE 0x00000200
+#define SH7780_PCICR_TBS 0x00000100
+#define SH7780_PCICR_ARBM 0x00000040
+#define SH7780_PCICR_IOCS 0x00000004
+#define SH7780_PCICR_PRST 0x00000002
+#define SH7780_PCICR_CFIN 0x00000001
+
+#define p4_in(addr) *((vu_long *)addr)
+#define p4_out(data,addr) *(vu_long *)(addr) = (data)
+#define p4_inw(addr) *((vu_short *)addr)
+#define p4_outw(data,addr) *(vu_short *)(addr) = (data)
+
+int pci_sh4_read_config_dword(struct pci_controller *hose,
+ pci_dev_t dev, int offset, u32 *value)
+{
+ u32 par_data = 0x80000000 | dev;
+
+ p4_out(par_data | (offset & 0xfc), SH7780_PCIPAR);
+ *value = p4_in(SH7780_PCIPDR);
+
+ return 0;
+}
+
+int pci_sh4_write_config_dword(struct pci_controller *hose,
+ pci_dev_t dev, int offset, u32 value)
+{
+ u32 par_data = 0x80000000 | dev;
+
+ p4_out(par_data | (offset & 0xfc), SH7780_PCIPAR);
+ p4_out(value, SH7780_PCIPDR);
+ return 0;
+}
+
+int pci_sh7780_init(struct pci_controller *hose)
+{
+ p4_out(0x01, SH7780_PCIECR);
+
+ if (p4_inw(SH7780_PCIVID) != SH7780_VENDOR_ID
+ && p4_inw(SH7780_PCIDID) != SH7780_DEVICE_ID){
+ printf("PCI: Unknown PCI host bridge.\n");
+ return;
+ }
+ printf("PCI: SH7780 PCI host bridge found.\n");
+
+ /* Toggle PCI reset pin */
+ p4_out((SH7780_PCICR_PREFIX | SH7780_PCICR_PRST), SH7780_PCICR);
+ udelay(100000);
+ p4_out(SH7780_PCICR_PREFIX, SH7780_PCICR);
+ p4_outw(0x0047, SH7780_PCICMD);
+
+ p4_out(0x07F00001, SH7780_PCILSR0);
+ p4_out(0x08000000, SH7780_PCILAR0);
+ p4_out(0x00000000, SH7780_PCILSR1);
+ p4_out(0, SH7780_PCILAR1);
+ p4_out(0x08000000, SH7780_PCIMBAR0);
+ p4_out(0x00000000, SH7780_PCIMBAR1);
+
+ p4_out(0xFD000000, SH7780_PCIMBR0);
+ p4_out(0x00FC0000, SH7780_PCIMBMR0);
+
+ /* if use Operand Cache then enable PCICSCR Soonp bits. */
+ p4_out(0x08000000, SH7780_PCICSAR0);
+ p4_out(0x0000001B, SH7780_PCICSCR0); /* Snoop bit :On */
+
+ p4_out((SH7780_PCICR_PREFIX | SH7780_PCICR_CFIN | SH7780_PCICR_ARBM
+ | SH7780_PCICR_FTO | SH7780_PCICR_PFCS | SH7780_PCICR_PFE),
+ SH7780_PCICR);
+
+ pci_sh4_init(hose);
+ return 0;
+}
diff --git a/drivers/serial/serial_sh.c b/drivers/serial/serial_sh.c
index 70fd23ff0a..522f96d5db 100644
--- a/drivers/serial/serial_sh.c
+++ b/drivers/serial/serial_sh.c
@@ -37,39 +37,46 @@
#define SCFCR (vu_short *)(SCIF_BASE + 0x18)
#define SCFDR (vu_short *)(SCIF_BASE + 0x1C)
#ifdef CONFIG_CPU_SH7720 /* SH7720 specific */
-#define SCFSR (vu_short *)(SCIF_BASE + 0x14) /* SCSSR */
-#define SCFTDR (vu_char *)(SCIF_BASE + 0x20)
-#define SCFRDR (vu_char *)(SCIF_BASE + 0x24)
+# define SCFSR (vu_short *)(SCIF_BASE + 0x14) /* SCSSR */
+# define SCFTDR (vu_char *)(SCIF_BASE + 0x20)
+# define SCFRDR (vu_char *)(SCIF_BASE + 0x24)
#else
-#define SCFTDR (vu_char *)(SCIF_BASE + 0xC)
-#define SCFSR (vu_short *)(SCIF_BASE + 0x10)
-#define SCFRDR (vu_char *)(SCIF_BASE + 0x14)
+# define SCFTDR (vu_char *)(SCIF_BASE + 0xC)
+# define SCFSR (vu_short *)(SCIF_BASE + 0x10)
+# define SCFRDR (vu_char *)(SCIF_BASE + 0x14)
#endif
-#if defined(CONFIG_SH4A)
-#define SCRFDR (vu_short *)(SCIF_BASE + 0x20)
-#define SCSPTR (vu_short *)(SCIF_BASE + 0x24)
-#define SCLSR (vu_short *)(SCIF_BASE + 0x28)
-#define SCRER (vu_short *)(SCIF_BASE + 0x2C)
-#define LSR_ORER 1
-#elif defined (CONFIG_SH4)
-#define SCSPTR (vu_short *)(SCIF_BASE + 0x20)
-#define SCLSR (vu_short *)(SCIF_BASE + 0x24)
-#define LSR_ORER 1
-#elif defined (CONFIG_SH3)
-#ifdef CONFIG_CPU_SH7720 /* SH7720 specific */
-#define SCLSR (vu_short *)(SCIF_BASE + 0x24)
-#define LSR_ORER 0x0200
-#else
-#define SCLSR SCFSR /* SCSSR */
-#define LSR_ORER 1
-#endif
+#if defined(CONFIG_CPU_SH7780) || \
+ defined(CONFIG_CPU_SH7785)
+# define SCRFDR (vu_short *)(SCIF_BASE + 0x20)
+# define SCSPTR (vu_short *)(SCIF_BASE + 0x24)
+# define SCLSR (vu_short *)(SCIF_BASE + 0x28)
+# define SCRER (vu_short *)(SCIF_BASE + 0x2C)
+# define LSR_ORER 1
+# define FIFOLEVEL_MASK 0xFF
+#elif defined(CONFIG_CPU_SH7750) || \
+ defined(CONFIG_CPU_SH7751) || \
+ defined(CONFIG_CPU_SH7722)
+# define SCSPTR (vu_short *)(SCIF_BASE + 0x20)
+# define SCLSR (vu_short *)(SCIF_BASE + 0x24)
+# define LSR_ORER 1
+# define FIFOLEVEL_MASK 0x1F
+#elif defined(CONFIG_CPU_SH7720)
+# define SCLSR (vu_short *)(SCIF_BASE + 0x24)
+# define LSR_ORER 0x0200
+# define FIFOLEVEL_MASK 0x1F
+#elif defined(CONFIG_CPU_SH7710)
+ defined(CONFIG_CPU_SH7712)
+# define SCLSR SCFSR /* SCSSR */
+# define LSR_ORER 1
+# define FIFOLEVEL_MASK 0x1F
#endif
+/* SCBRR register value setting */
#if defined(CONFIG_CPU_SH7720)
-#define SCBRR_VALUE(bps, clk) (((clk*2)+16*bps)/(32*bps)-1)
+# define SCBRR_VALUE(bps, clk) (((clk*2)+16*bps)/(32*bps)-1)
#else /* Generic SuperH */
-#define SCBRR_VALUE(bps, clk) ((clk+16*bps)/(32*bps)-1)
+# define SCBRR_VALUE(bps, clk) ((clk+16*bps)/(32*bps)-1)
#endif
#define SCR_RE (1 << 4)
@@ -105,14 +112,13 @@ int serial_init (void)
return 0;
}
-static int serial_tx_fifo_level (void)
-{
- return (*SCFDR >> 8) & 0x1F;
-}
-
static int serial_rx_fifo_level (void)
{
- return (*SCFDR >> 0) & 0x1F;
+#if defined(CONFIG_SH4A)
+ return (*SCRFDR >> 0) & FIFOLEVEL_MASK;
+#else
+ return (*SCFDR >> 0) & FIFOLEVEL_MASK;
+#endif
}
void serial_raw_putc (const char c)