From: Jingchang Lu <jingchang...@freescale.com>
Signed-off-by: Jingchang Lu <jingchang...@freescale.com>
Signed-off-by: Yuan Yao <yao.y...@freescale.com>
---
Change log:
v3: New file.
drivers/serial/serial_lpuart.c | 122 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 122 insertions(+)
diff --git a/drivers/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c
index da5f9a2..6e639b7 100644
--- a/drivers/serial/serial_lpuart.c
+++ b/drivers/serial/serial_lpuart.c
@@ -17,10 +17,34 @@
#define UC2_TE (1 << 3)
#define UC2_RE (1 << 2)
+#define STAT_LBKDIF (1 << 31)
+#define STAT_RXEDGIF (1 << 30)
+#define STAT_TDRE (1 << 23)
+#define STAT_RDRF (1 << 21)
+#define STAT_IDLE (1 << 20)
+#define STAT_OR (1 << 19)
+#define STAT_NF (1 << 18)
+#define STAT_FE (1 << 17)
+#define STAT_PF (1 << 16)
+#define STAT_MA1F (1 << 15)
+#define STAT_MA2F (1 << 14)
+#define STAT_FLAGS (STAT_LBKDIF | STAT_RXEDGIF | STAT_IDLE | STAT_OR | \
+ STAT_NF | STAT_FE | STAT_PF | STAT_MA1F | STAT_MA2F)
+
+#define CTRL_TE (1 << 19)
+#define CTRL_RE (1 << 18)
+
+#define FIFO_TXFE 0x80
+#define FIFO_RXFE 0x40
+
+#define WATER_TXWATER_OFF 1
+#define WATER_RXWATER_OFF 16
+
DECLARE_GLOBAL_DATA_PTR;
struct lpuart_fsl *base = (struct lpuart_fsl *)LPUART_BASE;
+#ifndef CONFIG_LPUART_32B_REG
static void lpuart_serial_setbrg(void)
{
u32 clk = mxc_get_clock(MXC_UART_CLK);
@@ -107,13 +131,111 @@ static struct serial_device lpuart_serial_drv = {
.getc = lpuart_serial_getc,
.tstc = lpuart_serial_tstc,
};
+#else
+static void lpuart32_serial_setbrg(void)
+{
+ u32 clk = CONFIG_SYS_CLK_FREQ;
+ u32 sbr;
+
+ if (!gd->baudrate)
+ gd->baudrate = CONFIG_BAUDRATE;
+
+ sbr = (clk / (16 * gd->baudrate));
+ /* place adjustment later - n/32 BRFA */
+
+ out_be32(&base->baud, sbr);
+}
+
+static int lpuart32_serial_getc(void)
+{
+ u32 stat;
+
+ while (((stat = in_be32(&base->stat)) & STAT_RDRF) == 0) {
+ out_be32(&base->stat, STAT_FLAGS);
+ WATCHDOG_RESET();
+ }
+
+ return in_be32(&base->data) & 0x3ff;
+}
+
+static void lpuart32_serial_putc(const char c)
+{
+ if (c == '\n')
+ serial_putc('\r');
+
+ while (!(in_be32(&base->stat) & STAT_TDRE))
+ WATCHDOG_RESET();
+
+ out_be32(&base->data, c);
+}
+
+/*
+ * Test whether a character is in the RX buffer
+ */
+static int lpuart32_serial_tstc(void)
+{
+ if ((in_be32(&base->water) >> 24) == 0)
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Initialise the serial port with the given baudrate. The settings
+ * are always 8 data bits, no parity, 1 stop bit, no start bits.
+ */
+static int lpuart32_serial_init(void)
+{
+ u8 ctrl;
+
+ ctrl = in_be32(&base->ctrl);
+ ctrl &= ~CTRL_RE;
+ ctrl &= ~CTRL_TE;
+ out_be32(&base->ctrl, ctrl);
+
+ out_be32(&base->modir, 0);
+ out_be32(&base->fifo, ~(FIFO_TXFE | FIFO_RXFE));
+
+ out_be32(&base->match, 0);
+ /* provide data bits, parity, stop bit, etc */
+
+ serial_setbrg();
+
+ out_be32(&base->ctrl, CTRL_RE | CTRL_TE);
+
+ return 0;
+}
+
+static struct serial_device lpuart32_serial_drv = {
+ .name = "lpuart32_serial",
+ .start = lpuart32_serial_init,
+ .stop = NULL,
+ .setbrg = lpuart32_serial_setbrg,
+ .putc = lpuart32_serial_putc,
+ .puts = default_serial_puts,
+ .getc = lpuart32_serial_getc,
+ .tstc = lpuart32_serial_tstc,
+};
+#endif
+void lpuart32_serial_initialize(void)
+{
+ serial_register(&lpuart32_serial_drv);
+}
void lpuart_serial_initialize(void)
{
+#ifdef CONFIG_LPUART_32B_REG
+ serial_register(&lpuart32_serial_drv);
+#else
serial_register(&lpuart_serial_drv);
+#endif
}
__weak struct serial_device *default_serial_console(void)
{
+#ifdef CONFIG_LPUART_32B_REG
+ return &lpuart32_serial_drv;
+#else
return &lpuart_serial_drv;
+#endif
}
--
1.8.4
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