diff options
author | Grant Likely <grant.likely@secretlab.ca> | 2007-10-02 02:15:13 (GMT) |
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committer | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2007-10-03 12:23:13 (GMT) |
commit | 7ddc5f978b16c024b6c1fcecbda6815d3d3222ef (patch) | |
tree | c6772bcbf1c19583b9aaf1303aea09e12e2568a0 /arch/powerpc/boot/uartlite.c | |
parent | 340ffd267c85fc28da7cfd681b177c816af800cf (diff) | |
download | linux-fsl-qoriq-7ddc5f978b16c024b6c1fcecbda6815d3d3222ef.tar.xz |
[POWERPC] Virtex: Add uartlite bootwrapper driver
Allows the bootwrapper to use the uartlite device for console output.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'arch/powerpc/boot/uartlite.c')
-rw-r--r-- | arch/powerpc/boot/uartlite.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/powerpc/boot/uartlite.c b/arch/powerpc/boot/uartlite.c new file mode 100644 index 0000000..f4249a7 --- /dev/null +++ b/arch/powerpc/boot/uartlite.c @@ -0,0 +1,64 @@ +/* + * Xilinx UARTLITE bootloader driver + * + * Copyright (C) 2007 Secret Lab Technologies Ltd. + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#include <stdarg.h> +#include <stddef.h> +#include "types.h" +#include "string.h" +#include "stdio.h" +#include "io.h" +#include "ops.h" + +static void * reg_base; + +static int uartlite_open(void) +{ + /* Clear the RX FIFO */ + out_be32(reg_base + 0x0C, 0x2); + return 0; +} + +static void uartlite_putc(unsigned char c) +{ + while ((in_be32(reg_base + 0x8) & 0x08) != 0); /* spin */ + out_be32(reg_base + 0x4, c); +} + +static unsigned char uartlite_getc(void) +{ + while ((in_be32(reg_base + 0x8) & 0x01) == 0); /* spin */ + return in_be32(reg_base); +} + +static u8 uartlite_tstc(void) +{ + return ((in_be32(reg_base + 0x8) & 0x01) != 0); +} + +int uartlite_console_init(void *devp, struct serial_console_data *scdp) +{ + int n; + unsigned long reg_phys; + + n = getprop(devp, "virtual-reg", ®_base, sizeof(reg_base)); + if (n != sizeof(reg_base)) { + if (!dt_xlate_reg(devp, 0, ®_phys, NULL)) + return -1; + + reg_base = (void *)reg_phys; + } + + scdp->open = uartlite_open; + scdp->putc = uartlite_putc; + scdp->getc = uartlite_getc; + scdp->tstc = uartlite_tstc; + scdp->close = NULL; + return 0; +} |