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From: Tanmay Upadhyay on 22 Apr 2010 09:30
This patch enables user to use serial port 1 of the OpenRD device for SDIO
or UART(RS232/RS485). The selection can be done through kernel parameter.

By default the port would be used for SDIO. To select RS232 or RS485 mode,
pass string "uart=232" or "uart=485" respectively in the kernel parameters.
"uart=485" is ignored on OpenRD-Base as it doesn't have RS485 port.

Signed-off-by: Tanmay Upadhyay <tanmay.upadhyay(a)einfochips.com>
---
arch/arm/mach-kirkwood/openrd-setup.c | 67 ++++++++++++++++++++++++++++++++-
1 files changed, 66 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-kirkwood/openrd-setup.c b/arch/arm/mach-kirkwood/openrd-setup.c
index ad3f1ec..fb4bfad 100644
--- a/arch/arm/mach-kirkwood/openrd-setup.c
+++ b/arch/arm/mach-kirkwood/openrd-setup.c
@@ -15,6 +15,8 @@
#include <linux/mtd/partitions.h>
#include <linux/ata_platform.h>
#include <linux/mv643xx_eth.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <mach/kirkwood.h>
@@ -56,16 +58,58 @@ static struct mvsdio_platform_data openrd_mvsdio_data = {
};

static unsigned int openrd_mpp_config[] __initdata = {
+ MPP12_SD_CLK,
+ MPP13_SD_CMD,
+ MPP14_SD_D0,
+ MPP15_SD_D1,
+ MPP16_SD_D2,
+ MPP17_SD_D3,
MPP29_GPIO,
0
};

+static int sd_uart_selection(void)
+{
+ /* Parse boot_command_line string uart=no/232/485 */
+ char *ptr = strstr(boot_command_line, "uart=");
+
+ /* Default is SD. Change if required, for UART */
+ if (ptr != NULL) {
+ if (!strncmp(ptr + 5, "232", 3)) {
+ /* Configure MPP for UART */
+ openrd_mpp_config[1] = MPP13_UART1_TXD;
+ openrd_mpp_config[2] = MPP14_UART1_RXD;
+
+ return 232;
+ } else if (!strncmp(ptr + 5, "485", 3)) {
+ /* OpenRD-Base doesn't have RS485. Treat is as an
+ * unknown argument & just have default setting -
+ * which is SD */
+ if (machine_is_openrd_base())
+ return 0;
+
+ /* Configure MPP for UART */
+ openrd_mpp_config[1] = MPP13_UART1_TXD;
+ openrd_mpp_config[2] = MPP14_UART1_RXD;
+
+ return 485;
+ }
+ }
+ return 0;
+}
+
static void __init openrd_init(void)
{
+ int uart1;
+
/*
* Basic setup. Needs to be called early.
*/
kirkwood_init();
+
+ /* This function modifies MPP config according to boot argument */
+ uart1 = sd_uart_selection();
+
kirkwood_mpp_conf(openrd_mpp_config);

kirkwood_uart0_init();
@@ -77,9 +121,30 @@ static void __init openrd_init(void)
if (machine_is_openrd_client())
kirkwood_ge01_init(&openrd_ge01_data);
kirkwood_sata_init(&openrd_sata_data);
- kirkwood_sdio_init(&openrd_mvsdio_data);

kirkwood_i2c_init();
+
+ if (!uart1) {
+ /* Select SD
+ * Pin # 34: 0 => UART1, 1 => SD */
+ writel(readl(GPIO_OUT(34)) | 4, GPIO_OUT(34));
+
+ kirkwood_sdio_init(&openrd_mvsdio_data);
+ } else {
+ /* Select UART1
+ * Pin # 34: 0 => UART1, 1 => SD */
+ writel(readl(GPIO_OUT(34)) & ~(4), GPIO_OUT(34));
+
+ /* Select RS232 OR RS485
+ * Pin # 28: 0 => RS232, 1 => RS485 */
+ if (uart1 == 232)
+ writel(readl(GPIO_OUT(28)) & ~(0x10000000),
+ GPIO_OUT(28));
+ else
+ writel(readl(GPIO_OUT(28)) | 0x10000000, GPIO_OUT(28));
+
+ kirkwood_uart1_init();
+ }
}

static int __init openrd_pci_init(void)
--
1.6.6.1

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Prev: [PATCH 0/2] genirq: reliably replay pending edge-triggered irq (plus doc)
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