On 09/14/2012 09:45 AM, Marek Vasut wrote:
Dear Michal Simek,
The driver is used on Xilinx Zynq platform.
Signed-off-by: Michal Simek monstr@monstr.eu CC: Joe Hershberger joe.hershberger@gmail.com CC: Marek Vasut marex@denx.de
v2: Use Zynq name instead of Dragonfire and XPSS/XDFUART Rename driver name Remove driver description
v3: SERIAL_MULTI support Rename xdfuart to uart_zynq
common/serial.c | 8 ++ drivers/serial/Makefile | 1 + drivers/serial/serial_zynq.c | 246 ++++++++++++++++++++++++++++++++++++++++++ include/serial.h | 5 + 4 files changed, 260 insertions(+), 0 deletions(-) create mode 100644 drivers/serial/serial_zynq.c
diff --git a/common/serial.c b/common/serial.c index 75cc1bb..4f2bc7f 100644 --- a/common/serial.c +++ b/common/serial.c @@ -122,6 +122,14 @@ void serial_initialize(void) serial_register(&uartlite_serial3_device); # endif /* XILINX_UARTLITE_BASEADDR3 */ #endif /* CONFIG_XILINX_UARTLITE */ +#if defined(CONFIG_ZYNQ_SERIAL) +# ifdef CONFIG_ZYNQ_SERIAL_BASEADDR0
- serial_register(&uart_zynq_serial0_device);
+# endif +# ifdef CONFIG_ZYNQ_SERIAL_BASEADDR1
- serial_register(&uart_zynq_serial1_device);
+# endif +#endif serial_assign(default_serial_console()->name); }
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 65d0f23..dfc22a4 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -56,6 +56,7 @@ COBJS-$(CONFIG_S3C44B0_SERIAL) += serial_s3c44b0.o COBJS-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o COBJS-$(CONFIG_SANDBOX_SERIAL) += sandbox.o COBJS-$(CONFIG_SCIF_CONSOLE) += serial_sh.o +COBJS-$(CONFIG_ZYNQ_SERIAL) += serial_zynq.o
ifndef CONFIG_SPL_BUILD COBJS-$(CONFIG_USB_TTY) += usbtty.o diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c new file mode 100644 index 0000000..30f2445 --- /dev/null +++ b/drivers/serial/serial_zynq.c @@ -0,0 +1,246 @@ +/*
- Copyright (C) 2012 Michal Simek monstr@monstr.eu
- Copyright (C) 2011-2012 Xilinx, Inc. All rights reserved.
- 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 <watchdog.h> +#include <asm/io.h> +#include <linux/compiler.h> +#include <serial.h>
+#define ZYNQ_UART_SR_TXFULL 0x00000010 /* TX FIFO full */ +#define ZYNQ_UART_SR_RXEMPTY 0x00000002 /* RX FIFO empty */
+#define ZYNQ_UART_CR_TX_EN 0x00000010 /* TX enabled */ +#define ZYNQ_UART_CR_RX_EN 0x00000004 /* RX enabled */ +#define ZYNQ_UART_CR_TXRST 0x00000002 /* TX logic reset */ +#define ZYNQ_UART_CR_RXRST 0x00000001 /* RX logic reset */
+#define ZYNQ_UART_MR_PARITY_NONE 0x00000020 /* No parity mode */
+/* Some clock/baud constants */ +#define ZYNQ_UART_BDIV 15 /* Default/reset BDIV value */ +#define ZYNQ_UART_BASECLK 3125000L /* master / (bdiv + 1) */
+struct uart_zynq {
- u32 control; /* Control Register [8:0] */
- u32 mode; /* Mode Register [10:0] */
- u32 reserved1[4];
- u32 baud_rate_gen; /* Baud Rate Generator [15:0] */
- u32 reserved2[4];
- u32 channel_sts; /* Channel Status [11:0] */
- u32 tx_rx_fifo; /* FIFO [15:0] or [7:0] */
- u32 baud_rate_divider; /* Baud Rate Divider [7:0] */
+};
+static struct uart_zynq *uart_zynq_ports[2] = { +#ifdef CONFIG_ZYNQ_SERIAL_BASEADDR0
- [0] = (struct uart_zynq *)CONFIG_ZYNQ_SERIAL_BASEADDR0,
+#endif +#ifdef CONFIG_ZYNQ_SERIAL_BASEADDR1
- [1] = (struct uart_zynq *)CONFIG_ZYNQ_SERIAL_BASEADDR1,
+#endif +};
+struct uart_zynq_params {
- u32 baudrate;
- u32 clock;
+};
+static struct uart_zynq_params uart_zynq_ports_param[2] = { +#if defined(CONFIG_ZYNQ_SERIAL_BAUDRATE0) && defined(CONFIG_ZYNQ_SERIAL_CLOCK0) + [0].baudrate = CONFIG_ZYNQ_SERIAL_BAUDRATE0,
- [0].clock = CONFIG_ZYNQ_SERIAL_CLOCK0,
+#endif +#if defined(CONFIG_ZYNQ_SERIAL_BAUDRATE1) && defined(CONFIG_ZYNQ_SERIAL_CLOCK1) + [1].baudrate = CONFIG_ZYNQ_SERIAL_BAUDRATE1,
- [1].clock = CONFIG_ZYNQ_SERIAL_CLOCK1,
+#endif +};
+/* Set up the baud rate in gd struct */ +static void uart_zynq_serial_setbrg(const int port) +{
- /* Calculation results. */
- unsigned int calc_bauderror, bdiv, bgen;
- unsigned long calc_baud = 0;
- unsigned long baud = uart_zynq_ports_param[port].baudrate;
- unsigned long clock = uart_zynq_ports_param[port].clock;
- struct uart_zynq *regs = uart_zynq_ports[port];
- /* master clock
* Baud rate = ------------------* bgen * (bdiv + 1)** Find acceptable values for baud generation.*/- for (bdiv = 4; bdiv < 255; bdiv++) {
bgen = clock / (baud * (bdiv + 1));if (bgen < 2 || bgen > 65535)continue;calc_baud = clock / (bgen * (bdiv + 1));/** Use first calculated baudrate with* an acceptable (<3%) error*/if (baud > calc_baud)calc_bauderror = baud - calc_baud;elsecalc_bauderror = calc_baud - baud;if (((calc_bauderror * 100) / baud) < 3)break;- }
- writel(bdiv, ®s->baud_rate_divider);
- writel(bgen, ®s->baud_rate_gen);
+}
+/* Initialize the UART, with...some settings. */ +static int uart_zynq_serial_init(const int port) +{
- struct uart_zynq *regs = uart_zynq_ports[port];
- if (!regs)
return -1;- /* RX/TX enabled & reset */
- writel(ZYNQ_UART_CR_TX_EN | ZYNQ_UART_CR_RX_EN | ZYNQ_UART_CR_TXRST | \
ZYNQ_UART_CR_RXRST, ®s->control);- writel(ZYNQ_UART_MR_PARITY_NONE, ®s->mode); /* 8 bit, no parity */
- uart_zynq_serial_setbrg(port);
- return 0;
+}
+static void uart_zynq_serial_putc(const char c, const int port) +{
- struct uart_zynq *regs = uart_zynq_ports[port];
- while ((readl(®s->channel_sts) & ZYNQ_UART_SR_TXFULL) != 0)
WATCHDOG_RESET();- if (c == '\n') {
writel('\r', ®s->tx_rx_fifo);while ((readl(®s->channel_sts) & ZYNQ_UART_SR_TXFULL) != 0)WATCHDOG_RESET();- }
- writel(c, ®s->tx_rx_fifo);
+}
+static void uart_zynq_serial_puts(const char *s, const int port) +{
- while (*s)
uart_zynq_serial_putc(*s++, port);+}
Remark for myself ... squash all these while (*s) putc() constructs into serial core. I'll be adding a patch into my massive patchset I'm cooking for this, you don't worry as this is ok for now.
+static int uart_zynq_serial_tstc(const int port) +{
- struct uart_zynq *regs = uart_zynq_ports[port];
- return (readl(®s->channel_sts) & ZYNQ_UART_SR_RXEMPTY) == 0;
+}
+static int uart_zynq_serial_getc(const int port) +{
- struct uart_zynq *regs = uart_zynq_ports[port];
- while (!uart_zynq_serial_tstc(port))
WATCHDOG_RESET();- return readl(®s->tx_rx_fifo);
+}
+#if !defined(CONFIG_SERIAL_MULTI) +int serial_init(void) +{
- return uart_zynq_serial_init(0);
+}
+void serial_setbrg(void) +{
- uart_zynq_serial_setbrg(0);
+}
+void serial_putc(const char c) +{
- uart_zynq_serial_putc(c, 0);
+}
+void serial_puts(const char *s) +{
- uart_zynq_serial_puts(s, 0);
+}
+int serial_getc(void) +{
- return uart_zynq_serial_getc(0);
+}
+int serial_tstc(void) +{
- return uart_zynq_serial_tstc(0);
+} +#else +/* Multi serial device functions */ +#define DECLARE_PSSERIAL_FUNCTIONS(port) \
- int uart_zynq##port##_init(void) \
{ return uart_zynq_serial_init(port); } \- void uart_zynq##port##_setbrg(void) \
{ return uart_zynq_serial_setbrg(port); } \- int uart_zynq##port##_getc(void) \
{ return uart_zynq_serial_getc(port); } \- int uart_zynq##port##_tstc(void) \
{ return uart_zynq_serial_tstc(port); } \- void uart_zynq##port##_putc(const char c) \
{ uart_zynq_serial_putc(c, port); } \- void uart_zynq##port##_puts(const char *s) \
{ uart_zynq_serial_puts(s, port); }+/* Serial device descriptor */ +#define INIT_PSSERIAL_STRUCTURE(port, name) {\
Rename the "name" to __name (this is because once you rename it -- see below -- name will colide with .name)
name,\explicitly spell out the name of structure members, so the structure instance is agile to reordering the the declaration members.
No problem to change it. I have seen it in your stdio branch
uart_zynq##port##_init,\NULL,\uart_zynq##port##_setbrg,\uart_zynq##port##_getc,\uart_zynq##port##_tstc,\uart_zynq##port##_putc,\uart_zynq##port##_puts, }+DECLARE_PSSERIAL_FUNCTIONS(0); +struct serial_device uart_zynq_serial0_device =
- INIT_PSSERIAL_STRUCTURE(0, "ttyPS0");
+DECLARE_PSSERIAL_FUNCTIONS(1); +struct serial_device uart_zynq_serial1_device =
- INIT_PSSERIAL_STRUCTURE(1, "ttyPS1");
+__weak struct serial_device *default_serial_console(void) +{
- if (uart_zynq_ports[0])
return &uart_zynq_serial0_device;- if (uart_zynq_ports[1])
return &uart_zynq_serial1_device;- return NULL;
+} +#endif diff --git a/include/serial.h b/include/serial.h index cbdf8a9..dc8e9b4 100644 --- a/include/serial.h +++ b/include/serial.h @@ -89,6 +89,11 @@ extern struct serial_device bfin_serial2_device; extern struct serial_device bfin_serial3_device; #endif
+#if defined(CONFIG_ZYNQ_SERIAL) +extern struct serial_device uart_zynq_serial0_device; +extern struct serial_device uart_zynq_serial1_device; +#endif
Let's not add this, noone uses it.
It is used by serial core where you register serial device.
- serial_register(&uart_zynq_serial0_device);
You need declaration somewhere. If you don't have it then this error message is shown. serial.c: In function 'serial_initialize': serial.c:127:19: error: 'uart_zynq_serial0_device' undeclared (first use in this function) serial.c:127:19: note: each undeclared identifier is reported only once for each function it appears in
Thanks, Michal