@@ -625,6 +625,14 @@ config MSM_SERIAL
for example APQ8016 and MSM8916.
Single baudrate is supported in current implementation (115200).
+config OWL_SERIAL
+ bool "Actions Semi OWL UART"
+ depends on DM_SERIAL && ARCH_OWL
+ help
+ If you have a Actions Semi OWL based board and want to use the on-chip
+ serial port, say Y to this option. If unsure, say N.
+ Single baudrate is supported in current implementation (115200).
+
config PXA_SERIAL
bool "PXA serial port support"
help
@@ -64,6 +64,7 @@ obj-$(CONFIG_MSM_SERIAL) += serial_msm.o
obj-$(CONFIG_MVEBU_A3700_UART) += serial_mvebu_a3700.o
obj-$(CONFIG_MPC8XX_CONS) += serial_mpc8xx.o
obj-$(CONFIG_NULLDEV_SERIAL) += serial_nulldev.o
+obj-$(CONFIG_OWL_SERIAL) += serial_owl.o
ifndef CONFIG_SPL_BUILD
obj-$(CONFIG_USB_TTY) += usbtty.o
new file mode 100644
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Actions Semi OWL SoCs UART driver
+ *
+ * Copyright (C) 2015 Actions Semi Co., Ltd.
+ * Copyright (C) 2018 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <serial.h>
+#include <asm/io.h>
+#include <asm/types.h>
+
+/* UART Registers */
+#define OWL_UART_CTL (0x0000)
+#define OWL_UART_RXDAT (0x0004)
+#define OWL_UART_TXDAT (0x0008)
+#define OWL_UART_STAT (0x000C)
+
+/* UART_CTL Register Definitions */
+#define OWL_UART_CTL_PRS_NONE GENMASK(6, 4)
+#define OWL_UART_CTL_STPS BIT(2)
+#define OWL_UART_CTL_DWLS 3
+
+/* UART_STAT Register Definitions */
+#define OWL_UART_STAT_TFES BIT(10) /* TX FIFO Empty Status */
+#define OWL_UART_STAT_RFFS BIT(9) /* RX FIFO full Status */
+#define OWL_UART_STAT_TFFU BIT(6) /* TX FIFO full Status */
+#define OWL_UART_STAT_RFEM BIT(5) /* RX FIFO Empty Status */
+
+struct owl_serial_priv {
+ phys_addr_t base;
+};
+
+int owl_serial_setbrg(struct udevice *dev, int baudrate)
+{
+ /* Driver supports only fixed baudrate */
+ return 0;
+}
+
+static int owl_serial_getc(struct udevice *dev)
+{
+ struct owl_serial_priv *priv = dev_get_priv(dev);
+
+ if (readl(priv->base + OWL_UART_STAT) & OWL_UART_STAT_RFEM)
+ return -EAGAIN;
+
+ return (int)(readl(priv->base + OWL_UART_RXDAT));
+}
+
+static int owl_serial_putc(struct udevice *dev, const char ch)
+{
+ struct owl_serial_priv *priv = dev_get_priv(dev);
+
+ if (readl(priv->base + OWL_UART_STAT) & OWL_UART_STAT_TFFU)
+ return -EAGAIN;
+
+ writel(ch, priv->base + OWL_UART_TXDAT);
+
+ return 0;
+}
+
+static int owl_serial_pending(struct udevice *dev, bool input)
+{
+ struct owl_serial_priv *priv = dev_get_priv(dev);
+ unsigned int stat = readl(priv->base + OWL_UART_STAT);
+
+ if (input)
+ return !(stat & OWL_UART_STAT_RFEM);
+ else
+ return !(stat & OWL_UART_STAT_TFES);
+}
+
+static int owl_serial_probe(struct udevice *dev)
+{
+ struct owl_serial_priv *priv = dev_get_priv(dev);
+ struct clk clk;
+ u32 uart_ctl;
+ int ret;
+
+ /* Set data, parity and stop bits */
+ uart_ctl = readl(priv->base + OWL_UART_CTL);
+ uart_ctl &= ~(OWL_UART_CTL_PRS_NONE);
+ uart_ctl &= ~(OWL_UART_CTL_STPS);
+ uart_ctl |= OWL_UART_CTL_DWLS;
+ writel(uart_ctl, priv->base + OWL_UART_CTL);
+
+ /* Enable UART clock */
+ ret = clk_get_by_index(dev, 0, &clk);
+ if (ret < 0)
+ return ret;
+
+ ret = clk_enable(&clk);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int owl_serial_ofdata_to_platdata(struct udevice *dev)
+{
+ struct owl_serial_priv *priv = dev_get_priv(dev);
+
+ priv->base = dev_read_addr(dev);
+ if (priv->base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const struct dm_serial_ops owl_serial_ops = {
+ .putc = owl_serial_putc,
+ .pending = owl_serial_pending,
+ .getc = owl_serial_getc,
+ .setbrg = owl_serial_setbrg,
+};
+
+static const struct udevice_id owl_serial_ids[] = {
+ { .compatible = "actions,s900-serial" },
+ { }
+};
+
+U_BOOT_DRIVER(serial_owl) = {
+ .name = "serial_owl",
+ .id = UCLASS_SERIAL,
+ .of_match = owl_serial_ids,
+ .ofdata_to_platdata = owl_serial_ofdata_to_platdata,
+ .priv_auto_alloc_size = sizeof(struct owl_serial_priv),
+ .probe = owl_serial_probe,
+ .ops = &owl_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
This commit adds Actions Semi OWL family UART support. This driver relies on baudrate configured by primary bootloaders. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> --- Changes in v3: * Moved the change log from cover letter Changes in v2: None drivers/serial/Kconfig | 8 +++ drivers/serial/Makefile | 1 + drivers/serial/serial_owl.c | 136 ++++++++++++++++++++++++++++++++++++ 3 files changed, 145 insertions(+) create mode 100644 drivers/serial/serial_owl.c