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Diffstat (limited to 'payloads/libpayload/drivers/serial/s5p.c')
-rw-r--r--payloads/libpayload/drivers/serial/s5p.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/serial/s5p.c b/payloads/libpayload/drivers/serial/s5p.c
new file mode 100644
index 0000000000..1d23352ec4
--- /dev/null
+++ b/payloads/libpayload/drivers/serial/s5p.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <libpayload.h>
+#include <stdint.h>
+
+struct s5p_uart
+{
+ uint32_t ulcon; // line control
+ uint32_t ucon; // control
+ uint32_t ufcon; // FIFO control
+ uint32_t umcon; // modem control
+ uint32_t utrstat; // Tx/Rx status
+ uint32_t uerstat; // Rx error status
+ uint32_t ufstat; // FIFO status
+ uint32_t umstat; // modem status
+ uint32_t utxh; // transmit buffer
+ uint32_t urxh; // receive buffer
+ uint32_t ubrdiv; // baud rate divisor
+ uint32_t ufracval; // divisor fractional value
+ uint32_t uintp; // interrupt pending
+ uint32_t uints; // interrupt source
+ uint32_t uintm; // interrupt mask
+};
+
+static struct s5p_uart *uart_regs;
+
+void serial_putchar(unsigned int c)
+{
+ const uint32_t TxFifoFullBit = (0x1 << 24);
+
+ while (readl(&uart_regs->ufstat) & TxFifoFullBit)
+ {;}
+
+ writeb(c, &uart_regs->utxh);
+ if (c == '\n')
+ serial_putchar('\r');
+}
+
+int serial_havechar(void)
+{
+ const uint32_t DataReadyMask = (0xf << 0) | (0x1 << 8);
+
+ return (readl(&uart_regs->ufstat) & DataReadyMask) != 0;
+}
+
+int serial_getchar(void)
+{
+ while (!serial_havechar())
+ {;}
+
+ return readb(&uart_regs->urxh);
+}
+
+static struct console_output_driver s5p_serial_output =
+{
+ .putchar = &serial_putchar
+};
+
+static struct console_input_driver s5p_serial_input =
+{
+ .havekey = &serial_havechar,
+ .getchar = &serial_getchar
+};
+
+void serial_init(void)
+{
+ if (!lib_sysinfo.serial || !lib_sysinfo.serial->baseaddr)
+ return;
+
+ uart_regs = (struct s5p_uart *)lib_sysinfo.serial->baseaddr;
+}
+
+void serial_console_init(void)
+{
+ serial_init();
+
+ if (uart_regs) {
+ console_add_output_driver(&s5p_serial_output);
+ console_add_input_driver(&s5p_serial_input);
+ }
+}