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u-boot/drivers/serial/serial_bcm6345.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
*
* Derived from linux/drivers/tty/serial/bcm63xx_uart.c:
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
*/
#include <clk.h>
#include <dm.h>
#include <debug_uart.h>
#include <errno.h>
#include <serial.h>
#include <asm/io.h>
#include <asm/types.h>
/* UART Control register */
#define UART_CTL_REG 0x0
#define UART_CTL_RXTIMEOUT_MASK 0x1f
#define UART_CTL_RXTIMEOUT_5 0x5
#define UART_CTL_RSTRXFIFO_SHIFT 6
#define UART_CTL_RSTRXFIFO_MASK (1 << UART_CTL_RSTRXFIFO_SHIFT)
#define UART_CTL_RSTTXFIFO_SHIFT 7
#define UART_CTL_RSTTXFIFO_MASK (1 << UART_CTL_RSTTXFIFO_SHIFT)
#define UART_CTL_STOPBITS_SHIFT 8
#define UART_CTL_STOPBITS_MASK (0xf << UART_CTL_STOPBITS_SHIFT)
#define UART_CTL_STOPBITS_1 (0x7 << UART_CTL_STOPBITS_SHIFT)
#define UART_CTL_BITSPERSYM_SHIFT 12
#define UART_CTL_BITSPERSYM_MASK (0x3 << UART_CTL_BITSPERSYM_SHIFT)
#define UART_CTL_BITSPERSYM_8 (0x3 << UART_CTL_BITSPERSYM_SHIFT)
#define UART_CTL_XMITBRK_SHIFT 14
#define UART_CTL_XMITBRK_MASK (1 << UART_CTL_XMITBRK_SHIFT)
#define UART_CTL_RSVD_SHIFT 15
#define UART_CTL_RSVD_MASK (1 << UART_CTL_RSVD_SHIFT)
#define UART_CTL_RXPAREVEN_SHIFT 16
#define UART_CTL_RXPAREVEN_MASK (1 << UART_CTL_RXPAREVEN_SHIFT)
#define UART_CTL_RXPAREN_SHIFT 17
#define UART_CTL_RXPAREN_MASK (1 << UART_CTL_RXPAREN_SHIFT)
#define UART_CTL_TXPAREVEN_SHIFT 18
#define UART_CTL_TXPAREVEN_MASK (1 << UART_CTL_TXPAREVEN_SHIFT)
#define UART_CTL_TXPAREN_SHIFT 19
#define UART_CTL_TXPAREN_MASK (1 << UART_CTL_TXPAREN_SHIFT)
#define UART_CTL_LOOPBACK_SHIFT 20
#define UART_CTL_LOOPBACK_MASK (1 << UART_CTL_LOOPBACK_SHIFT)
#define UART_CTL_RXEN_SHIFT 21
#define UART_CTL_RXEN_MASK (1 << UART_CTL_RXEN_SHIFT)
#define UART_CTL_TXEN_SHIFT 22
#define UART_CTL_TXEN_MASK (1 << UART_CTL_TXEN_SHIFT)
#define UART_CTL_BRGEN_SHIFT 23
#define UART_CTL_BRGEN_MASK (1 << UART_CTL_BRGEN_SHIFT)
/* UART Baudword register */
#define UART_BAUD_REG 0x4
/* UART FIFO Config register */
#define UART_FIFO_CFG_REG 0x8
#define UART_FIFO_CFG_RX_SHIFT 8
#define UART_FIFO_CFG_RX_MASK (0xf << UART_FIFO_CFG_RX_SHIFT)
#define UART_FIFO_CFG_RX_4 (0x4 << UART_FIFO_CFG_RX_SHIFT)
#define UART_FIFO_CFG_TX_SHIFT 12
#define UART_FIFO_CFG_TX_MASK (0xf << UART_FIFO_CFG_TX_SHIFT)
#define UART_FIFO_CFG_TX_4 (0x4 << UART_FIFO_CFG_TX_SHIFT)
/* UART Interrupt register */
#define UART_IR_REG 0x10
#define UART_IR_STAT(x) (1 << (x))
#define UART_IR_TXEMPTY 5
#define UART_IR_RXOVER 7
#define UART_IR_RXNOTEMPTY 11
/* UART FIFO register */
#define UART_FIFO_REG 0x14
#define UART_FIFO_VALID_MASK 0xff
#define UART_FIFO_FRAMEERR_SHIFT 8
#define UART_FIFO_FRAMEERR_MASK (1 << UART_FIFO_FRAMEERR_SHIFT)
#define UART_FIFO_PARERR_SHIFT 9
#define UART_FIFO_PARERR_MASK (1 << UART_FIFO_PARERR_SHIFT)
#define UART_FIFO_BRKDET_SHIFT 10
#define UART_FIFO_BRKDET_MASK (1 << UART_FIFO_BRKDET_SHIFT)
#define UART_FIFO_ANYERR_MASK (UART_FIFO_FRAMEERR_MASK | \
UART_FIFO_PARERR_MASK | \
UART_FIFO_BRKDET_MASK)
struct bcm6345_serial_priv {
void __iomem *base;
ulong uartclk;
};
/* enable rx & tx operation on uart */
static void bcm6345_serial_enable(void __iomem *base)
{
setbits_be32(base + UART_CTL_REG, UART_CTL_BRGEN_MASK |
UART_CTL_TXEN_MASK | UART_CTL_RXEN_MASK);
}
/* disable rx & tx operation on uart */
static void bcm6345_serial_disable(void __iomem *base)
{
clrbits_be32(base + UART_CTL_REG, UART_CTL_BRGEN_MASK |
UART_CTL_TXEN_MASK | UART_CTL_RXEN_MASK);
}
/* clear all unread data in rx fifo and unsent data in tx fifo */
static void bcm6345_serial_flush(void __iomem *base)
{
/* empty rx and tx fifo */
setbits_be32(base + UART_CTL_REG, UART_CTL_RSTRXFIFO_MASK |
UART_CTL_RSTTXFIFO_MASK);
/* read any pending char to make sure all irq status are cleared */
readl_be(base + UART_FIFO_REG);
}
static int bcm6345_serial_init(void __iomem *base, ulong clk, u32 baudrate)
{
u32 val;
/* mask all irq and flush port */
bcm6345_serial_disable(base);
bcm6345_serial_flush(base);
/* set uart control config */
clrsetbits_be32(base + UART_CTL_REG,
/* clear rx timeout */
UART_CTL_RXTIMEOUT_MASK |
/* clear stop bits */
UART_CTL_STOPBITS_MASK |
/* clear bits per symbol */
UART_CTL_BITSPERSYM_MASK |
/* clear xmit break */
UART_CTL_XMITBRK_MASK |
/* clear reserved bit */
UART_CTL_RSVD_MASK |
/* disable parity */
UART_CTL_RXPAREN_MASK |
UART_CTL_TXPAREN_MASK |
/* disable loopback */
UART_CTL_LOOPBACK_MASK,
/* set timeout to 5 */
UART_CTL_RXTIMEOUT_5 |
/* set 8 bits/symbol */
UART_CTL_BITSPERSYM_8 |
/* set 1 stop bit */
UART_CTL_STOPBITS_1 |
/* set parity to even */
UART_CTL_RXPAREVEN_MASK |
UART_CTL_TXPAREVEN_MASK);
/* set uart fifo config */
clrsetbits_be32(base + UART_FIFO_CFG_REG,
/* clear fifo config */
UART_FIFO_CFG_RX_MASK |
UART_FIFO_CFG_TX_MASK,
/* set fifo config to 4 */
UART_FIFO_CFG_RX_4 |
UART_FIFO_CFG_TX_4);
/* set baud rate */
val = ((clk / baudrate) >> 4);
if (val & 0x1)
val = (val >> 1);
else
val = (val >> 1) - 1;
writel_be(val, base + UART_BAUD_REG);
/* clear interrupts */
writel_be(0, base + UART_IR_REG);
/* enable uart */
bcm6345_serial_enable(base);
return 0;
}
static int bcm6345_serial_pending(struct udevice *dev, bool input)
{
struct bcm6345_serial_priv *priv = dev_get_priv(dev);
u32 val = readl_be(priv->base + UART_IR_REG);
if (input)
return !!(val & UART_IR_STAT(UART_IR_RXNOTEMPTY));
else
return !(val & UART_IR_STAT(UART_IR_TXEMPTY));
}
static int bcm6345_serial_setbrg(struct udevice *dev, int baudrate)
{
struct bcm6345_serial_priv *priv = dev_get_priv(dev);
return bcm6345_serial_init(priv->base, priv->uartclk, baudrate);
}
static int bcm6345_serial_putc(struct udevice *dev, const char ch)
{
struct bcm6345_serial_priv *priv = dev_get_priv(dev);
u32 val;
val = readl_be(priv->base + UART_IR_REG);
if (!(val & UART_IR_STAT(UART_IR_TXEMPTY)))
return -EAGAIN;
writel_be(ch, priv->base + UART_FIFO_REG);
return 0;
}
static int bcm6345_serial_getc(struct udevice *dev)
{
struct bcm6345_serial_priv *priv = dev_get_priv(dev);
u32 val;
val = readl_be(priv->base + UART_IR_REG);
if (val & UART_IR_STAT(UART_IR_RXOVER))
setbits_be32(priv->base + UART_CTL_REG,
UART_CTL_RSTRXFIFO_MASK);
if (!(val & UART_IR_STAT(UART_IR_RXNOTEMPTY)))
return -EAGAIN;
val = readl_be(priv->base + UART_FIFO_REG);
if (val & UART_FIFO_ANYERR_MASK)
return -EAGAIN;
return val & UART_FIFO_VALID_MASK;
}
static int bcm6345_serial_probe(struct udevice *dev)
{
struct bcm6345_serial_priv *priv = dev_get_priv(dev);
struct clk clk;
fdt_addr_t addr;
fdt_size_t size;
int ret;
/* get address */
addr = devfdt_get_addr_size_index(dev, 0, &size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->base = ioremap(addr, size);
/* get clock rate */
ret = clk_get_by_index(dev, 0, &clk);
if (ret < 0)
return ret;
priv->uartclk = clk_get_rate(&clk);
clk_free(&clk);
/* initialize serial */
return bcm6345_serial_init(priv->base, priv->uartclk, CONFIG_BAUDRATE);
}
static const struct dm_serial_ops bcm6345_serial_ops = {
.putc = bcm6345_serial_putc,
.pending = bcm6345_serial_pending,
.getc = bcm6345_serial_getc,
.setbrg = bcm6345_serial_setbrg,
};
static const struct udevice_id bcm6345_serial_ids[] = {
{ .compatible = "brcm,bcm6345-uart" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(bcm6345_serial) = {
.name = "bcm6345-uart",
.id = UCLASS_SERIAL,
.of_match = bcm6345_serial_ids,
.probe = bcm6345_serial_probe,
.priv_auto_alloc_size = sizeof(struct bcm6345_serial_priv),
.ops = &bcm6345_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};
#ifdef CONFIG_DEBUG_UART_BCM6345
static inline void _debug_uart_init(void)
{
void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
bcm6345_serial_init(base, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
}
static inline void wait_xfered(void __iomem *base)
{
do {
u32 val = readl_be(base + UART_IR_REG);
if (val & UART_IR_STAT(UART_IR_TXEMPTY))
break;
} while (1);
}
static inline void _debug_uart_putc(int ch)
{
void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
wait_xfered(base);
writel_be(ch, base + UART_FIFO_REG);
wait_xfered(base);
}
DEBUG_UART_FUNCS
#endif
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