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Subject[PATCH 2/6] tty: serial: lpuart: add little endian 32 bit register support
Date
It's based on the exist lpuart32 read/write implementation.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com> (supporter:TTY LAYER)
Cc: Fugang Duan <fugang.duan@nxp.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Mingkai Hu <Mingkai.Hu@nxp.com>
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
drivers/tty/serial/fsl_lpuart.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index cd4e905..bddd041 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -231,6 +231,8 @@
#define DEV_NAME "ttyLP"
#define UART_NR 6

+static bool lpuart_is_be;
+
struct lpuart_port {
struct uart_port port;
struct clk *clk;
@@ -260,6 +262,7 @@ struct lpuart_port {

struct lpuart_soc_data {
bool is_32;
+ bool is_be;
};

static struct lpuart_soc_data vf_data = {
@@ -268,6 +271,7 @@ static struct lpuart_soc_data vf_data = {

static struct lpuart_soc_data ls_data = {
.is_32 = true,
+ .is_be = true,
};

static const struct of_device_id lpuart_dt_ids[] = {
@@ -282,12 +286,15 @@ static void lpuart_dma_tx_complete(void *arg);

static u32 lpuart32_read(void __iomem *addr)
{
- return ioread32be(addr);
+ return lpuart_is_be ? ioread32be(addr) : readl(addr);
}

static void lpuart32_write(u32 val, void __iomem *addr)
{
- iowrite32be(val, addr);
+ if (lpuart_is_be)
+ iowrite32be(val, addr);
+ else
+ writel(val, addr);
}

static void lpuart_stop_tx(struct uart_port *port)
@@ -2000,6 +2007,7 @@ static int lpuart_probe(struct platform_device *pdev)
}
sport->port.line = ret;
sport->lpuart32 = sdata->is_32;
+ lpuart_is_be = sdata->is_be;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
--
2.7.4
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