ARC: [plat-arcfpga] Static platform device for CONFIG_SERIAL_ARC
N.B. This is old style of hardcoding platform device specific info
in code and it's instantiation thererof using platform_add_devices().
Subsequent patches replace this with DeviceTree based runtime probe.
This patch has been retained just as an example of "don't-do-this" for
newer kernel ports.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/arc/plat-arcfpga/platform.c b/arch/arc/plat-arcfpga/platform.c
index 7b5dcab..5388b31 100644
--- a/arch/arc/plat-arcfpga/platform.c
+++ b/arch/arc/plat-arcfpga/platform.c
@@ -10,7 +10,102 @@
#include <linux/types.h>
#include <linux/init.h>
+#include <linux/device.h>
#include <linux/platform_device.h>
+#include <linux/console.h>
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/clk.h>
+#include <plat/memmap.h>
+
+/*----------------------- Platform Devices -----------------------------*/
+
+#if defined(CONFIG_SERIAL_ARC) || defined(CONFIG_SERIAL_ARC_MODULE)
+
+static unsigned long arc_uart_info[] = {
+ CONFIG_ARC_SERIAL_BAUD, /* uart->baud */
+ -1, /* uart->port.uartclk */
+ -1, /* uart->is_emulated (runtime @running_on_hw) */
+ 0
+};
+
+#define ARC_UART_DEV(n) \
+ \
+static struct resource arc_uart##n##_res[] = { \
+ { \
+ .start = UART##n##_BASE, \
+ .end = UART##n##_BASE + 0xFF, \
+ .flags = IORESOURCE_MEM, \
+ }, \
+ { \
+ .start = UART##n##_IRQ, \
+ .end = UART##n##_IRQ, \
+ .flags = IORESOURCE_IRQ, \
+ }, \
+}; \
+ \
+static struct platform_device arc_uart##n##_dev = { \
+ .name = "arc-uart", \
+ .id = n, \
+ .num_resources = ARRAY_SIZE(arc_uart##n##_res), \
+ .resource = arc_uart##n##_res, \
+ .dev = { \
+ .platform_data = &arc_uart_info, \
+ }, \
+}
+
+ARC_UART_DEV(0);
+#if CONFIG_SERIAL_ARC_NR_PORTS > 1
+ARC_UART_DEV(1);
+#endif
+
+static struct platform_device *fpga_early_devs[] __initdata = {
+#if defined(CONFIG_SERIAL_ARC_CONSOLE)
+ &arc_uart0_dev,
+#endif
+};
+
+static void arc_fpga_serial_init(void)
+{
+ arc_uart_info[1] = arc_get_core_freq();
+
+ /* To let driver workaround ISS bug: baudh Reg can't be set to 0 */
+ arc_uart_info[2] = !running_on_hw;
+
+ early_platform_add_devices(fpga_early_devs,
+ ARRAY_SIZE(fpga_early_devs));
+
+ /*
+ * ARC console driver registers itself as an early platform driver
+ * of class "earlyprintk".
+ * Install it here, followed by probe of devices.
+ * The installation here doesn't require earlyprintk in command line
+ * To do so however, replace the lines below with
+ * parse_early_param();
+ * early_platform_driver_probe("earlyprintk", 1, 1);
+ * ^^
+ */
+ early_platform_driver_register_all("earlyprintk");
+ early_platform_driver_probe("earlyprintk", 1, 0);
+
+ /*
+ * This is to make sure that arc uart would be preferred console
+ * despite one/more of following:
+ * -command line lacked "console=ttyARC0" or
+ * -CONFIG_VT_CONSOLE was enabled (for no reason whatsoever)
+ * Note that this needs to be done after above early console is reg,
+ * otherwise the early console never gets a chance to run.
+ */
+ add_preferred_console("ttyARC", 0, "115200");
+}
+
+#else
+
+static void arc_fpga_serial_init(void)
+{
+}
+
+#endif /* CONFIG_SERIAL_ARC */
/*
* Early Platform Initialization called from setup_arch()
@@ -18,12 +113,25 @@
void __init arc_platform_early_init(void)
{
pr_info("[plat-arcfpga]: registering early dev resources\n");
+
+ arc_fpga_serial_init();
}
+static struct platform_device *fpga_devs[] __initdata = {
+#if defined(CONFIG_SERIAL_ARC) || defined(CONFIG_SERIAL_ARC_MODULE)
+ &arc_uart0_dev,
+#if CONFIG_SERIAL_ARC_NR_PORTS > 1
+ &arc_uart1_dev,
+#endif
+#endif
+};
+
int __init fpga_plat_init(void)
{
pr_info("[plat-arcfpga]: registering device resources\n");
+ platform_add_devices(fpga_devs, ARRAY_SIZE(fpga_devs));
+
return 0;
}
arch_initcall(fpga_plat_init);