serial: omap: Introduce DM specific omap serial

Add driver model support for OMAP_SERIAL while reusing
the functions in ns16550.c

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Tested-by: Derald D. Woods <woods.technical@gmail.com>

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 766e5ce..41f43af 100644 (file)
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -625,6 +625,15 @@ config MSM_SERIAL
          for example APQ8016 and MSM8916.
          Single baudrate is supported in current implementation (115200).
 
+config OMAP_SERIAL
+       bool "Support for OMAP specific UART"
+       depends on DM_SERIAL
+       default y if ARCH_OMAP2PLUS
+       select SYS_NS16550
+       help
+         If you have an TI based SoC and want to use the on-chip serial
+         port, say Y to this option. If unsure say N.
+
 config OWL_SERIAL
        bool "Actions Semi OWL UART"
        depends on DM_SERIAL && ARCH_OWL

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 9fa81d8..03dc29e 100644 (file)
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -65,6 +65,7 @@ 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
+obj-$(CONFIG_OMAP_SERIAL) += serial_omap.o
 
 ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_USB_TTY) += usbtty.o

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 9c80090..f9041aa 100644 (file)
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -175,7 +175,7 @@ void NS16550_init(NS16550_t com_port, int baud_divisor)
                ;
 
        serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
-#if defined(CONFIG_ARCH_OMAP2PLUS)
+#if defined(CONFIG_ARCH_OMAP2PLUS) || defined(CONFIG_OMAP_SERIAL)
        serial_out(0x7, &com_port->mdr1);       /* mode select reset TL16C750*/
 #endif
 
@@ -183,7 +183,8 @@ void NS16550_init(NS16550_t com_port, int baud_divisor)
        serial_out(ns16550_getfcr(com_port), &com_port->fcr);
        if (baud_divisor != -1)
                NS16550_setbrg(com_port, baud_divisor);
-#if defined(CONFIG_ARCH_OMAP2PLUS) || defined(CONFIG_SOC_DA8XX)
+#if defined(CONFIG_ARCH_OMAP2PLUS) || defined(CONFIG_SOC_DA8XX) || \
+       defined(CONFIG_OMAP_SERIAL)
        /* /16 is proper to hit 115200 with 48MHz */
        serial_out(0, &com_port->mdr1);
 #endif
@@ -279,42 +280,6 @@ DEBUG_UART_FUNCS
 
 #endif
 
-#ifdef CONFIG_DEBUG_UART_OMAP
-
-#include <debug_uart.h>
-
-static inline void _debug_uart_init(void)
-{
-       struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
-       int baud_divisor;
-
-       baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
-                                           CONFIG_BAUDRATE);
-       serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
-       serial_dout(&com_port->mdr1, 0x7);
-       serial_dout(&com_port->mcr, UART_MCRVAL);
-       serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
-
-       serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
-       serial_dout(&com_port->dll, baud_divisor & 0xff);
-       serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
-       serial_dout(&com_port->lcr, UART_LCRVAL);
-       serial_dout(&com_port->mdr1, 0x0);
-}
-
-static inline void _debug_uart_putc(int ch)
-{
-       struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
-
-       while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
-               ;
-       serial_dout(&com_port->thr, ch);
-}
-
-DEBUG_UART_FUNCS
-
-#endif
-
 #ifdef CONFIG_DM_SERIAL
 static int ns16550_serial_putc(struct udevice *dev, const char ch)
 {
@@ -489,12 +454,6 @@ static const struct udevice_id ns16550_serial_ids[] = {
        { .compatible = "ingenic,jz4780-uart",  .data = PORT_JZ4780  },
        { .compatible = "nvidia,tegra20-uart",  .data = PORT_NS16550 },
        { .compatible = "snps,dw-apb-uart",     .data = PORT_NS16550 },
-       { .compatible = "ti,omap2-uart",        .data = PORT_NS16550 },
-       { .compatible = "ti,omap3-uart",        .data = PORT_NS16550 },
-       { .compatible = "ti,omap4-uart",        .data = PORT_NS16550 },
-       { .compatible = "ti,am3352-uart",       .data = PORT_NS16550 },
-       { .compatible = "ti,am4372-uart",       .data = PORT_NS16550 },
-       { .compatible = "ti,dra742-uart",       .data = PORT_NS16550 },
        {}
 };
 #endif /* OF_CONTROL && !OF_PLATDATA */

diff --git a/drivers/serial/serial_omap.c b/drivers/serial/serial_omap.c
new file mode 100644 (file)
index 0000000..d8a047b
--- /dev/null
+++ b/drivers/serial/serial_omap.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments' OMAP serial driver
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *     Lokesh Vutla <lokeshvutla@ti.com>
+ */
+
+#include <common.h>
+#include <debug_uart.h>
+#include <dm.h>
+#include <dt-structs.h>
+#include <ns16550.h>
+#include <serial.h>
+#include <clk.h>
+
+#ifndef CONFIG_SYS_NS16550_CLK
+#define CONFIG_SYS_NS16550_CLK  0
+#endif
+
+#ifdef CONFIG_DEBUG_UART_OMAP
+
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+       struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
+       int baud_divisor;
+
+       baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
+                                           CONFIG_BAUDRATE);
+       serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
+       serial_dout(&com_port->mdr1, 0x7);
+       serial_dout(&com_port->mcr, UART_MCRVAL);
+       serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
+
+       serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
+       serial_dout(&com_port->dll, baud_divisor & 0xff);
+       serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
+       serial_dout(&com_port->lcr, UART_LCRVAL);
+       serial_dout(&com_port->mdr1, 0x0);
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+       struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
+
+       while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
+               ;
+       serial_dout(&com_port->thr, ch);
+}
+
+DEBUG_UART_FUNCS
+
+#endif
+
+#if CONFIG_IS_ENABLED(DM_SERIAL)
+
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+static int omap_serial_ofdata_to_platdata(struct udevice *dev)
+{
+       struct ns16550_platdata *plat = dev->platdata;
+       fdt_addr_t addr;
+       struct clk clk;
+       int err;
+
+       /* try Processor Local Bus device first */
+       addr = dev_read_addr(dev);
+       if (addr == FDT_ADDR_T_NONE)
+               return -EINVAL;
+
+       plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
+
+       plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0);
+       plat->reg_shift = 2;
+
+       err = clk_get_by_index(dev, 0, &clk);
+       if (!err) {
+               err = clk_get_rate(&clk);
+               if (!IS_ERR_VALUE(err))
+                       plat->clock = err;
+       } else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) {
+               debug("omap serial failed to get clock\n");
+               return err;
+       }
+
+       if (!plat->clock)
+               plat->clock = dev_read_u32_default(dev, "clock-frequency",
+                                                  CONFIG_SYS_NS16550_CLK);
+       if (!plat->clock) {
+               debug("omap serial clock not defined\n");
+               return -EINVAL;
+       }
+
+       plat->fcr = UART_FCR_DEFVAL;
+
+       return 0;
+}
+
+static const struct udevice_id omap_serial_ids[] = {
+       { .compatible = "ti,omap2-uart", },
+       { .compatible = "ti,omap3-uart", },
+       { .compatible = "ti,omap4-uart", },
+       { .compatible = "ti,am3352-uart", },
+       { .compatible = "ti,am4372-uart", },
+       { .compatible = "ti,dra742-uart", },
+       {}
+};
+#endif /* OF_CONTROL && !OF_PLATDATA */
+
+#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
+U_BOOT_DRIVER(omap_serial) = {
+       .name   = "omap_serial",
+       .id     = UCLASS_SERIAL,
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
+       .of_match = omap_serial_ids,
+       .ofdata_to_platdata = omap_serial_ofdata_to_platdata,
+       .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
+#endif
+       .priv_auto_alloc_size = sizeof(struct NS16550),
+       .probe = ns16550_serial_probe,
+       .ops    = &ns16550_serial_ops,
+       .flags  = DM_FLAG_PRE_RELOC,
+};
+#endif
+#endif /* DM_SERIAL */