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Subject[PATCH] tty: serial: msm: Support big-endian CPUs
Date
To support big-endian CPUs use the string versions of the io
read/write macros on the TX/RX fifos and the non-raw variants of
the readl/writel macros throughout. This way we don't byteswap
the characters coming from the fifos but we properly deal with
the little-endian nature of the serial hardware while controlling
it.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
drivers/tty/serial/msm_serial.c | 28 ++++++++++++++++++----------
drivers/tty/serial/msm_serial.h | 4 ++--
2 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 72000a6d5af0..abdf73773401 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -125,14 +125,14 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
port->icount.rx += count;

while (count > 0) {
- unsigned int c;
+ unsigned char buf[4];

sr = msm_read(port, UART_SR);
if ((sr & UART_SR_RX_READY) == 0) {
msm_port->old_snap_state -= count;
break;
}
- c = msm_read(port, UARTDM_RF);
+ ioread32_rep(port->membase + UARTDM_RF, buf, 1);
if (sr & UART_SR_RX_BREAK) {
port->icount.brk++;
if (uart_handle_break(port))
@@ -141,8 +141,7 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
port->icount.frame++;

/* TODO: handle sysrq */
- tty_insert_flip_string(tport, (char *)&c,
- (count > 4) ? 4 : count);
+ tty_insert_flip_string(tport, buf, min(count, 4));
count -= 4;
}

@@ -219,6 +218,12 @@ static void handle_tx(struct uart_port *port)
struct msm_port *msm_port = UART_TO_MSM(port);
unsigned int tx_count, num_chars;
unsigned int tf_pointer = 0;
+ void __iomem *tf;
+
+ if (msm_port->is_uartdm)
+ tf = port->membase + UARTDM_TF;
+ else
+ tf = port->membase + UART_TF;

tx_count = uart_circ_chars_pending(xmit);
tx_count = min3(tx_count, (unsigned int)UART_XMIT_SIZE - xmit->tail,
@@ -228,8 +233,7 @@ static void handle_tx(struct uart_port *port)
if (msm_port->is_uartdm)
reset_dm_count(port, tx_count + 1);

- msm_write(port, port->x_char,
- msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+ iowrite8_rep(tf, &port->x_char, 1);
port->icount.tx++;
port->x_char = 0;
} else if (tx_count && msm_port->is_uartdm) {
@@ -239,7 +243,6 @@ static void handle_tx(struct uart_port *port)
while (tf_pointer < tx_count) {
int i;
char buf[4] = { 0 };
- unsigned int *bf = (unsigned int *)&buf;

if (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
break;
@@ -255,7 +258,7 @@ static void handle_tx(struct uart_port *port)
port->icount.tx++;
}

- msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+ iowrite32_rep(tf, buf, 1);
xmit->tail = (xmit->tail + num_chars) & (UART_XMIT_SIZE - 1);
tf_pointer += num_chars;
}
@@ -861,12 +864,18 @@ static void msm_console_write(struct console *co, const char *s,
struct msm_port *msm_port;
int num_newlines = 0;
bool replaced = false;
+ void __iomem *tf;

BUG_ON(co->index < 0 || co->index >= UART_NR);

port = get_port_from_line(co->index);
msm_port = UART_TO_MSM(port);

+ if (msm_port->is_uartdm)
+ tf = port->membase + UARTDM_TF;
+ else
+ tf = port->membase + UART_TF;
+
/* Account for newlines that will get a carriage return added */
for (i = 0; i < count; i++)
if (s[i] == '\n')
@@ -882,7 +891,6 @@ static void msm_console_write(struct console *co, const char *s,
int j;
unsigned int num_chars;
char buf[4] = { 0 };
- unsigned int *bf = (unsigned int *)&buf;

if (msm_port->is_uartdm)
num_chars = min(count - i, (unsigned int)sizeof(buf));
@@ -907,7 +915,7 @@ static void msm_console_write(struct console *co, const char *s,
while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
cpu_relax();

- msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+ iowrite32_rep(tf, buf, 1);
i += num_chars;
}
spin_unlock(&port->lock);
diff --git a/drivers/tty/serial/msm_serial.h b/drivers/tty/serial/msm_serial.h
index d98d45efdf86..73d3abe71e79 100644
--- a/drivers/tty/serial/msm_serial.h
+++ b/drivers/tty/serial/msm_serial.h
@@ -126,13 +126,13 @@
static inline
void msm_write(struct uart_port *port, unsigned int val, unsigned int off)
{
- __raw_writel(val, port->membase + off);
+ writel_relaxed(val, port->membase + off);
}

static inline
unsigned int msm_read(struct uart_port *port, unsigned int off)
{
- return __raw_readl(port->membase + off);
+ return readl_relaxed(port->membase + off);
}

/*
--
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