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Date: Wed, 22 Jul 2015 12:34:56 +0300
From: Noam Camus <noamc@...hip.com>
To: <linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>
CC: <Alexey.Brodkin@...opsys.com>, <vgupta@...opsys.com>,
<gregkh@...uxfoundation.org>, <jslaby@...e.com>,
Noam Camus <noamc@...hip.com>
Subject: [PATCH 1/4] serial: 8250_dw: Add support for big-endian MMIO accesses
From: Noam Camus <noamc@...hip.com>
Add support for UPIO_MEM32BE in addition to UPIO_MEM32.
Signed-off-by: Noam Camus <noamc@...hip.com>
---
drivers/tty/serial/8250/8250_dw.c | 42 ++++++++++++++++++++++++++++++------
1 files changed, 35 insertions(+), 7 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index d48b506..fe0b487 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -173,15 +173,13 @@ static void dw8250_serial_outq(struct uart_port *p, int offset, int value)
}
#endif /* CONFIG_64BIT */
-static void dw8250_serial_out32(struct uart_port *p, int offset, int value)
+static void dw8250_check_control(struct uart_port *p, int offset, int value)
{
struct dw8250_data *d = p->private_data;
if (offset == UART_MCR)
d->last_mcr = value;
- writel(value, p->membase + (offset << p->regshift));
-
/* Make sure LCR write wasn't ignored */
if (offset == UART_LCR) {
int tries = 1000;
@@ -190,7 +188,12 @@ static void dw8250_serial_out32(struct uart_port *p, int offset, int value)
if ((value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR))
return;
dw8250_force_idle(p);
- writel(value, p->membase + (UART_LCR << p->regshift));
+ if (p->iotype == UPIO_MEM32BE)
+ iowrite32be(value,
+ p->membase + (UART_LCR << p->regshift));
+ else
+ writel(value,
+ p->membase + (UART_LCR << p->regshift));
}
/*
* FIXME: this deadlocks if port->lock is already held
@@ -199,6 +202,12 @@ static void dw8250_serial_out32(struct uart_port *p, int offset, int value)
}
}
+static void dw8250_serial_out32(struct uart_port *p, int offset, int value)
+{
+ writel(value, p->membase + (offset << p->regshift));
+ dw8250_check_control(p, offset, value);
+}
+
static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
{
unsigned int value = readl(p->membase + (offset << p->regshift));
@@ -206,6 +215,19 @@ static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
return dw8250_modify_msr(p, offset, value);
}
+static void dw8250_serial_out32be(struct uart_port *p, int offset, int value)
+{
+ iowrite32be(value, p->membase + (offset << p->regshift));
+ dw8250_check_control(p, offset, value);
+}
+
+static unsigned int dw8250_serial_in32be(struct uart_port *p, int offset)
+{
+ unsigned int value = ioread32be(p->membase + (offset << p->regshift));
+
+ return dw8250_modify_msr(p, offset, value);
+}
+
static int dw8250_handle_irq(struct uart_port *p)
{
struct dw8250_data *d = p->private_data;
@@ -322,9 +344,15 @@ static int dw8250_probe_of(struct uart_port *p,
case 1:
break;
case 4:
- p->iotype = UPIO_MEM32;
- p->serial_in = dw8250_serial_in32;
- p->serial_out = dw8250_serial_out32;
+ p->iotype = of_device_is_big_endian(np) ?
+ UPIO_MEM32BE : UPIO_MEM32;
+ if (p->iotype == UPIO_MEM32) {
+ p->serial_in = dw8250_serial_in32;
+ p->serial_out = dw8250_serial_out32;
+ } else {
+ p->serial_in = dw8250_serial_in32be;
+ p->serial_out = dw8250_serial_out32be;
+ }
break;
default:
dev_err(p->dev, "unsupported reg-io-width (%u)\n", val);
--
1.7.1
--
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