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tty: serial: msm: Support big-endian CPUs 

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Stephen Boyd 2014-06-30 14:54:01 -07:00 committed by Greg Kroah-Hartman
parent db3a1a43fb
commit 68252424a7
2 changed files with 20 additions and 12 deletions
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28
drivers/tty/serial/msm_serial.c
View File

@ -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);

4
drivers/tty/serial/msm_serial.h
View File

@ -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);
}
/*