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>

1 files changed, 108 insertions, 0 deletions

diff --git a/arch/arc/plat-arcfpga/platform.c b/arch/arc/plat-arcfpga/platform.c
index 7b5dcab5becb..5388b31e2ead 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);