[U-Boot] [PATCH] nios2: convert altera_uart to driver model
Thomas Chou
thomas at wytron.com.tw
Fri Sep 18 05:24:18 CEST 2015
Convert altera_uart to driver model.
Signed-off-by: Thomas Chou <thomas at wytron.com.tw>
---
arch/nios2/dts/3c120_devboard.dts | 1 +
drivers/serial/Kconfig | 6 ++
drivers/serial/altera_uart.c | 153 ++++++++++++++++++--------------------
include/configs/nios2-generic.h | 9 +--
4 files changed, 79 insertions(+), 90 deletions(-)
diff --git a/arch/nios2/dts/3c120_devboard.dts b/arch/nios2/dts/3c120_devboard.dts
index 7f76328..2159cfc 100644
--- a/arch/nios2/dts/3c120_devboard.dts
+++ b/arch/nios2/dts/3c120_devboard.dts
@@ -130,6 +130,7 @@
interrupts = <10>;
current-speed = <115200>;
clock-frequency = <62500000>;
+ u-boot,dm-pre-reloc;
};
};
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 5a8cb3a..34195e1 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -122,6 +122,12 @@ config ALTERA_JTAG_UART_BYPASS
Bypass console output and keep going even if there is no
JTAG terminal connection with the host.
+config ALTERA_UART
+ bool "Altera UART support"
+ depends on NIOS2 && DM_SERIAL
+ help
+ Select this to enable an UART for Altera devices.
+
config ROCKCHIP_SERIAL
bool "Rockchip on-chip UART support"
depends on ARCH_UNIPHIER && DM_SERIAL
diff --git a/drivers/serial/altera_uart.c b/drivers/serial/altera_uart.c
index d6b1484..8393d39 100644
--- a/drivers/serial/altera_uart.c
+++ b/drivers/serial/altera_uart.c
@@ -5,50 +5,31 @@
* SPDX-License-Identifier: GPL-2.0+
*/
-
#include <common.h>
-#include <watchdog.h>
+#include <dm.h>
+#include <errno.h>
#include <asm/io.h>
#include <linux/compiler.h>
#include <serial.h>
-typedef volatile struct {
+struct altera_uart_regs {
unsigned rxdata; /* Rx data reg */
unsigned txdata; /* Tx data reg */
unsigned status; /* Status reg */
unsigned control; /* Control reg */
unsigned divisor; /* Baud rate divisor reg */
unsigned endofpacket; /* End-of-packet reg */
-} nios_uart_t;
+};
+
+struct altera_uart_platdata {
+ struct altera_uart_regs *reg;
+ unsigned int uartclk;
+};
/* status register */
-#define NIOS_UART_PE (1 << 0) /* parity error */
-#define NIOS_UART_FE (1 << 1) /* frame error */
-#define NIOS_UART_BRK (1 << 2) /* break detect */
-#define NIOS_UART_ROE (1 << 3) /* rx overrun */
-#define NIOS_UART_TOE (1 << 4) /* tx overrun */
#define NIOS_UART_TMT (1 << 5) /* tx empty */
#define NIOS_UART_TRDY (1 << 6) /* tx ready */
#define NIOS_UART_RRDY (1 << 7) /* rx ready */
-#define NIOS_UART_E (1 << 8) /* exception */
-#define NIOS_UART_DCTS (1 << 10) /* cts change */
-#define NIOS_UART_CTS (1 << 11) /* cts */
-#define NIOS_UART_EOP (1 << 12) /* eop detected */
-
-/* control register */
-#define NIOS_UART_IPE (1 << 0) /* parity error int ena*/
-#define NIOS_UART_IFE (1 << 1) /* frame error int ena */
-#define NIOS_UART_IBRK (1 << 2) /* break detect int ena */
-#define NIOS_UART_IROE (1 << 3) /* rx overrun int ena */
-#define NIOS_UART_ITOE (1 << 4) /* tx overrun int ena */
-#define NIOS_UART_ITMT (1 << 5) /* tx empty int ena */
-#define NIOS_UART_ITRDY (1 << 6) /* tx ready int ena */
-#define NIOS_UART_IRRDY (1 << 7) /* rx ready int ena */
-#define NIOS_UART_IE (1 << 8) /* exception int ena */
-#define NIOS_UART_TBRK (1 << 9) /* transmit break */
-#define NIOS_UART_IDCTS (1 << 10) /* cts change int ena */
-#define NIOS_UART_RTS (1 << 11) /* rts */
-#define NIOS_UART_IEOP (1 << 12) /* eop detected int ena */
DECLARE_GLOBAL_DATA_PTR;
@@ -56,82 +37,90 @@ DECLARE_GLOBAL_DATA_PTR;
* UART the serial port
*-----------------------------------------------------------------*/
-static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
+static int altera_uart_setbrg(struct udevice *dev, int baudrate)
+{
+ struct altera_uart_platdata *plat = dev->platdata;
+ struct altera_uart_regs *const regs = plat->reg;
+ unsigned div;
-#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
+ div = (plat->uartclk / baudrate) - 1;
+ writel(div, ®s->divisor);
-/*
- * Everything's already setup for fixed-baud PTF
- * assignment
- */
-static void altera_serial_setbrg(void)
-{
+ return 0;
}
-static int altera_serial_init(void)
+static int altera_uart_putc(struct udevice *dev, const char c)
{
- return 0;
-}
+ struct altera_uart_platdata *plat = dev->platdata;
+ struct altera_uart_regs *const regs = plat->reg;
-#else
+ if (!(readl(®s->status) & NIOS_UART_TRDY))
+ return -EAGAIN;
-static void altera_serial_setbrg(void)
-{
- unsigned div;
+ writel((unsigned char)c, ®s->txdata);
- div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
- writel (div, &uart->divisor);
+ return 0;
}
-static int altera_serial_init(void)
+static int altera_uart_pending(struct udevice *dev, bool input)
{
- serial_setbrg();
- return 0;
+ struct altera_uart_platdata *plat = dev->platdata;
+ struct altera_uart_regs *const regs = plat->reg;
+ unsigned st = readl(®s->status);
+
+ if (input)
+ return (st & NIOS_UART_RRDY) ? 1 : 0;
+ else
+ return (st & NIOS_UART_TMT) ? 0 : 1;
}
-#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
-
-/*-----------------------------------------------------------------------
- * UART CONSOLE
- *---------------------------------------------------------------------*/
-static void altera_serial_putc(char c)
+static int altera_uart_getc(struct udevice *dev)
{
- if (c == '\n')
- serial_putc ('\r');
- while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
- WATCHDOG_RESET ();
- writel ((unsigned char)c, &uart->txdata);
+ struct altera_uart_platdata *plat = dev->platdata;
+ struct altera_uart_regs *const regs = plat->reg;
+
+ if (readl(®s->status) & NIOS_UART_RRDY)
+ return (readl(®s->rxdata) & 0xff);
+ else
+ return -EAGAIN;
}
-static int altera_serial_tstc(void)
+static int altera_uart_probe(struct udevice *dev)
{
- return (readl (&uart->status) & NIOS_UART_RRDY);
+ return 0;
}
-static int altera_serial_getc(void)
+static int altera_uart_ofdata_to_platdata(struct udevice *dev)
{
- while (serial_tstc () == 0)
- WATCHDOG_RESET ();
- return (readl (&uart->rxdata) & 0x00ff );
+ struct altera_uart_platdata *plat = dev_get_platdata(dev);
+
+ plat->reg = ioremap(dev_get_addr(dev),
+ sizeof(struct altera_uart_regs));
+ plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+ "clock-frequency", 0);
+
+ return 0;
}
-static struct serial_device altera_serial_drv = {
- .name = "altera_serial",
- .start = altera_serial_init,
- .stop = NULL,
- .setbrg = altera_serial_setbrg,
- .putc = altera_serial_putc,
- .puts = default_serial_puts,
- .getc = altera_serial_getc,
- .tstc = altera_serial_tstc,
+static const struct dm_serial_ops altera_uart_ops = {
+ .putc = altera_uart_putc,
+ .pending = altera_uart_pending,
+ .getc = altera_uart_getc,
+ .setbrg = altera_uart_setbrg,
};
-void altera_serial_initialize(void)
-{
- serial_register(&altera_serial_drv);
-}
+static const struct udevice_id altera_uart_ids[] = {
+ { .compatible = "altr,uart-1.0", },
+ { }
+};
-__weak struct serial_device *default_serial_console(void)
-{
- return &altera_serial_drv;
-}
+U_BOOT_DRIVER(altera_uart) = {
+ .name = "altera_uart",
+ .id = UCLASS_SERIAL,
+ .of_match = altera_uart_ids,
+ .ofdata_to_platdata = altera_uart_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct altera_uart_platdata),
+ .probe = altera_uart_probe,
+ .ops = &altera_uart_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
diff --git a/include/configs/nios2-generic.h b/include/configs/nios2-generic.h
index bd6d45c..dcb90de 100644
--- a/include/configs/nios2-generic.h
+++ b/include/configs/nios2-generic.h
@@ -23,14 +23,7 @@
/*
* SERIAL
*/
-#if defined(CONFIG_ALTERA_JTAG_UART)
-#else
-# define CONFIG_SYS_NIOS_CONSOLE CONFIG_SYS_UART_BASE
-#endif
-
-#define CONFIG_SYS_NIOS_FIXEDBAUD
-#define CONFIG_BAUDRATE CONFIG_SYS_UART_BAUD
-#define CONFIG_SYS_BAUDRATE_TABLE {CONFIG_BAUDRATE}
+#define CONFIG_BAUDRATE 115200
#define CONFIG_SYS_CONSOLE_INFO_QUIET /* Suppress console info */
/*
--
2.1.4
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