diff options
author | Tanmay Upadhyay <tanmay.upadhyay@einfochips.com> | 2010-08-26 11:11:58 +0530 |
---|---|---|
committer | Nicolas Pitre <nico@fluxnic.net> | 2010-09-19 22:43:43 -0400 |
commit | fd2ce9c59a63d1daec8d76d272eca5149fb8706a (patch) | |
tree | c8fc8ffc61873bde098ac6a9e43f70f44dcf3383 /arch/arm/mach-kirkwood | |
parent | f539dfedbd169e5ed47912bb517c75976ab556f3 (diff) |
[ARM] OpenRD: Enable SD/UART selection for serial port 1
This patch enables users to choose either the SDIO interface or UART1
(RS232/RS485). The selection can be done through kernel parameter.
By default the port would be used for SDIO interface. Passing the string
"kw_openrd_init_uart1=232" or "kw_openrd_init_uart1=485" enables either
the RS-232 or RS-485 port respectively; disabling the SDIO interface.
Anything else selects the default SDIO interface.
"kw_openrd_init_uart1=485" is ignored on OpenRD-Base as it doesn't
have RS485 port.
Signed-off-by: Tanmay Upadhyay <tanmay.upadhyay@einfochips.com>
Acked-by: Alexander Clouter <alex@digriz.org.uk>
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
Diffstat (limited to 'arch/arm/mach-kirkwood')
-rw-r--r-- | arch/arm/mach-kirkwood/openrd-setup.c | 101 |
1 files changed, 100 insertions, 1 deletions
diff --git a/arch/arm/mach-kirkwood/openrd-setup.c b/arch/arm/mach-kirkwood/openrd-setup.c index fd06be61881..38017c8ac43 100644 --- a/arch/arm/mach-kirkwood/openrd-setup.c +++ b/arch/arm/mach-kirkwood/openrd-setup.c @@ -16,6 +16,7 @@ #include <linux/ata_platform.h> #include <linux/mv643xx_eth.h> #include <linux/i2c.h> +#include <linux/gpio.h> #include <asm/mach-types.h> #include <asm/mach/arch.h> #include <mach/kirkwood.h> @@ -57,7 +58,22 @@ 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, + MPP28_GPIO, MPP29_GPIO, + MPP34_GPIO, + 0 +}; + +/* Configure MPP for UART1 */ +static unsigned int openrd_uart1_mpp_config[] __initdata = { + MPP13_UART1_TXD, + MPP14_UART1_RXD, 0 }; @@ -67,6 +83,68 @@ static struct i2c_board_info i2c_board_info[] __initdata = { }, }; +static int __initdata uart1; + +static int __init sd_uart_selection(char *str) +{ + uart1 = -EINVAL; + + /* Default is SD. Change if required, for UART */ + if (!str) + return 0; + + if (!strncmp(str, "232", 3)) { + uart1 = 232; + } else if (!strncmp(str, "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()) { + uart1 = -ENODEV; + return 1; + } + + uart1 = 485; + } + return 1; +} +/* Parse boot_command_line string kw_openrd_init_uart1=232/485 */ +__setup("kw_openrd_init_uart1=", sd_uart_selection); + +static int __init uart1_mpp_config(void) +{ + kirkwood_mpp_conf(openrd_uart1_mpp_config); + + if (gpio_request(34, "SD_UART1_SEL")) { + printk(KERN_ERR "GPIO request failed for SD/UART1 selection" + ", gpio: 34\n"); + return -EIO; + } + + if (gpio_request(28, "RS232_RS485_SEL")) { + printk(KERN_ERR "GPIO request failed for RS232/RS485 selection" + ", gpio# 28\n"); + gpio_free(34); + return -EIO; + } + + /* Select UART1 + * Pin # 34: 0 => UART1, 1 => SD */ + gpio_direction_output(34, 0); + + /* Select RS232 OR RS485 + * Pin # 28: 0 => RS232, 1 => RS485 */ + if (uart1 == 232) + gpio_direction_output(28, 0); + else + gpio_direction_output(28, 1); + + gpio_free(34); + gpio_free(28); + + return 0; +} + static void __init openrd_init(void) { /* @@ -90,7 +168,6 @@ static void __init openrd_init(void) kirkwood_ge01_init(&openrd_ge01_data); kirkwood_sata_init(&openrd_sata_data); - kirkwood_sdio_init(&openrd_mvsdio_data); kirkwood_i2c_init(); @@ -99,6 +176,28 @@ static void __init openrd_init(void) ARRAY_SIZE(i2c_board_info)); kirkwood_audio_init(); } + + if (uart1 <= 0) { + if (uart1 < 0) + printk(KERN_ERR "Invalid kernel parameter to select " + "UART1. Defaulting to SD. ERROR CODE: %d\n", + uart1); + + /* Select SD + * Pin # 34: 0 => UART1, 1 => SD */ + if (gpio_request(34, "SD_UART1_SEL")) { + printk(KERN_ERR "GPIO request failed for SD/UART1 " + "selection, gpio: 34\n"); + } else { + + gpio_direction_output(34, 1); + gpio_free(34); + kirkwood_sdio_init(&openrd_mvsdio_data); + } + } else { + if (!uart1_mpp_config()) + kirkwood_uart1_init(); + } } static int __init openrd_pci_init(void) |