Merge tag 'arc-v3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull ARC updates from Vineet Gupta:
 "Nothing too exciting here, just minor fixes/cleanup.  Only noteworthy
  ones are:

   - Moving cache disabling to early boot
   - ARC UART enabled only if earlyprintk setup in cmdline"

* tag 'arc-v3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: Disable caches in early boot if so configured
  ARC: [arcfpga] Early ARC UART to be only activated by cmdline
  ARC: [arcfpga] Get rid of legacy BVCI latency unit support
  ARC: remove duplicate header exports
  ARC: arc_local_timer_setup() need not pass own cpu id
  ARC: Fixed spelling errors within comments
  ARC: make start_thread() out-of-line
  ARC: fix mmuv2 warning
  ARC: [SMP] ISS SMP extension bitrot

1 files changed, 6 insertions, 66 deletions

diff --git a/arch/arc/plat-arcfpga/platform.c b/arch/arc/plat-arcfpga/platform.c
index 19b76b61f44b..61c7e5997387 100644
--- a/arch/arc/plat-arcfpga/platform.c
+++ b/arch/arc/plat-arcfpga/platform.c
@@ -22,59 +22,6 @@
 #include <plat/smp.h>
 #include <plat/irq.h>
 
-/*-----------------------BVCI Latency Unit -----------------------------*/
-
-#ifdef CONFIG_ARC_HAS_BVCI_LAT_UNIT
-
-int lat_cycles = CONFIG_BVCI_LAT_CYCLES;
-
-/* BVCI Bus Profiler: Latency Unit */
-static void __init setup_bvci_lat_unit(void)
-{
-#define MAX_BVCI_UNITS 12
-
-        unsigned int i;
-        unsigned int *base = (unsigned int *)BVCI_LAT_UNIT_BASE;
-        const unsigned long units_req = CONFIG_BVCI_LAT_UNITS;
-        const unsigned int REG_UNIT = 21;
-        const unsigned int REG_VAL = 22;
-
-        /*
-         * There are multiple Latency Units corresponding to the many
-         * interfaces of the system bus arbiter (both CPU side as well as
-         * the peripheral side).
-         *
-         * Unit  0 - System Arb and Mem Controller - adds latency to all
-         *          memory trasactions
-         * Unit  1 - I$ and System Bus
-         * Unit  2 - D$ and System Bus
-         * ..
-         * Unit 12 - IDE Disk controller and System Bus
-         *
-         * The programmers model requires writing to lat_unit reg first
-         * and then the latency value (cycles) to lat_value reg
-         */
-
-        if (CONFIG_BVCI_LAT_UNITS == 0) {
-                writel(0, base + REG_UNIT);
-                writel(lat_cycles, base + REG_VAL);
-                pr_info("BVCI Latency for all Memory Transactions %d cycles\n",
-                        lat_cycles);
-        } else {
-                for_each_set_bit(i, &units_req, MAX_BVCI_UNITS) {
-                        writel(i + 1, base + REG_UNIT); /* loop is 0 based */
-                        writel(lat_cycles, base + REG_VAL);
-                        pr_info("BVCI Latency for Unit[%d] = %d cycles\n",
-                                (i + 1), lat_cycles);
-                }
-        }
-}
-#else
-static void __init setup_bvci_lat_unit(void)
-{
-}
-#endif
-
 /*----------------------- Platform Devices -----------------------------*/
 
 #if IS_ENABLED(CONFIG_SERIAL_ARC)
@@ -132,16 +79,11 @@ static void arc_fpga_serial_init(void)
                                    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);
-         *                                                    ^^
+         * ARC console driver registers (build time) as an early platform driver
+         * of class "earlyprintk". However it needs explicit cmdline toggle
+         * "earlyprintk=ttyARC0" to be successfuly runtime registered.
+         * Otherwise the early probe below fails to find the driver
          */
-        early_platform_driver_register_all("earlyprintk");
         early_platform_driver_probe("earlyprintk", 1, 0);
 
         /*
@@ -165,11 +107,9 @@ static void __init plat_fpga_early_init(void)
 {
         pr_info("[plat-arcfpga]: registering early dev resources\n");
 
-        setup_bvci_lat_unit();
-
         arc_fpga_serial_init();
 
-#ifdef CONFIG_SMP
+#ifdef CONFIG_ISS_SMP_EXTN
         iss_model_init_early_smp();
 #endif
 }
@@ -211,7 +151,7 @@ MACHINE_START(ANGEL4, "angel4")
         .init_early     = plat_fpga_early_init,
         .init_machine   = plat_fpga_populate_dev,
         .init_irq       = plat_fpga_init_IRQ,
-#ifdef CONFIG_SMP
+#ifdef CONFIG_ISS_SMP_EXTN
         .init_smp       = iss_model_init_smp,
 #endif
 MACHINE_END