From: <Vineet.Gupta1@synopsys.com>
To: <linux-arch@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <tglx@linutronix.de>, <arnd@arndb.de>,
Vineet Gupta <Vineet.Gupta1@synopsys.com>
Subject: [RFC Patch v1 48/55] ARC: [plat-arfpga] BVCI Latency Unit setup
Date: Mon, 12 Nov 2012 17:19:06 +0530 [thread overview]
Message-ID: <1352720953-24321-18-git-send-email-vgupta@synopsys.com> (raw)
In-Reply-To: <1352720953-24321-1-git-send-email-vgupta@synopsys.com>
From: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/arc/plat-arcfpga/Kconfig | 32 +++++++++++++++++++++
arch/arc/plat-arcfpga/platform.c | 56 ++++++++++++++++++++++++++++++++++++++
2 files changed, 88 insertions(+), 0 deletions(-)
diff --git a/arch/arc/plat-arcfpga/Kconfig b/arch/arc/plat-arcfpga/Kconfig
index 1b65644..6bc1149 100644
--- a/arch/arc/plat-arcfpga/Kconfig
+++ b/arch/arc/plat-arcfpga/Kconfig
@@ -55,4 +55,36 @@ config ARC_SERIAL_LV2
depends on ARC_COMPACT_IRQ_LEVELS
select ARC_IRQ5_LV2
+menuconfig ARC_HAS_BVCI_LAT_UNIT
+ bool "BVCI Bus Latency Unit"
+ depends on ARC_BOARD_ML509 || ARC_BOARD_ANGEL4
+ help
+ IP to add artifical latency to BVCI Bus Based FPGA builds.
+ The default latency (even worst case) for FPGA is non-realistic
+ (~10 SDRAM, ~5 SSRAM).
+
+config BVCI_LAT_UNITS
+ hex "Latency Unit(s) Bitmap"
+ default "0x0"
+ depends on ARC_HAS_BVCI_LAT_UNIT
+ help
+ There are multiple Latency Units corresponding to the many
+ interfaces of the system bus arbiter (both CPU side as well as
+ the peripheral side).
+ To add latency to ALL memory transaction, choose Unit 0, otherwise
+ for finer grainer - interface wise latency, specify a bitmap (1 bit
+ per unit) of all units. e.g. 1,2,12 will be 0x1003
+
+ Unit 0 - System Arb and Mem Controller
+ Unit 1 - I$ and System Bus
+ Unit 2 - D$ and System Bus
+ ..
+ Unit 12 - IDE Disk controller and System Bus
+
+config BVCI_LAT_CYCLES
+ int "Latency Value in cycles"
+ range 0 63
+ default "30"
+ depends on ARC_HAS_BVCI_LAT_UNIT
+
endif
diff --git a/arch/arc/plat-arcfpga/platform.c b/arch/arc/plat-arcfpga/platform.c
index 3243091..d5d4a10 100644
--- a/arch/arc/plat-arcfpga/platform.c
+++ b/arch/arc/plat-arcfpga/platform.c
@@ -17,6 +17,60 @@
#include <asm/irq.h>
#include <plat/memmap.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
+
+ /* TBD: rewrite this using I/O macros */
+ volatile unsigned int *base = (unsigned int *)BVCI_LAT_UNIT_BASE;
+ volatile unsigned int *lat_unit = (unsigned int *)base + 21;
+ volatile unsigned int *lat_val = (unsigned int *)base + 22;
+ unsigned int unit;
+ const unsigned long units_req = CONFIG_BVCI_LAT_UNITS;
+
+ /*
+ * 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) {
+ *lat_unit = 0;
+ *lat_val = lat_cycles;
+ pr_info("BVCI Latency for all Memory Transactions %d cycles\n",
+ lat_cycles);
+ } else {
+ for_each_set_bit(unit, &units_req, MAX_BVCI_UNITS) {
+ *lat_unit = unit + 1; /* above returns 0 based */
+ *lat_val = lat_cycles;
+ pr_info("BVCI Latency for Unit[%d] = %d cycles\n",
+ (unit + 1), lat_cycles);
+ }
+ }
+}
+#else
+static void __init setup_bvci_lat_unit(void)
+{
+}
+#endif
+
/*----------------------- Platform Devices -----------------------------*/
#if defined(CONFIG_SERIAL_ARC) || defined(CONFIG_SERIAL_ARC_MODULE)
@@ -111,6 +165,8 @@ void __init arc_platform_early_init(void)
{
pr_info("[plat-arcfpga]: registering early dev resources\n");
+ setup_bvci_lat_unit();
+
arc_fpga_serial_init();
}
--
1.7.4.1
next prev parent reply other threads:[~2012-11-12 11:52 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-12 11:48 [RFC Patch v1 00/55] Addons to Synopsys ARC Linux kernel Port Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 32/55] ARC: [optim] Cache "current" in Register r25 Vineet.Gupta1
2012-11-12 13:50 ` Arnd Bergmann
2012-11-15 10:22 ` Vineet Gupta
2012-11-12 11:48 ` [RFC Patch v1 33/55] ARC: ptrace support Vineet.Gupta1
2012-11-12 13:51 ` Arnd Bergmann
2012-11-15 10:24 ` Vineet Gupta
2012-11-15 11:56 ` Arnd Bergmann
2012-11-12 11:48 ` [RFC Patch v1 34/55] ARC: futex Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 35/55] ARC: oprofile support Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 36/55] ARC: ARCompact 2 levels IRQ (high/low priority) Handling Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 37/55] ARC: dynamic loadable module support Vineet.Gupta1
2012-11-12 13:53 ` Arnd Bergmann
2012-11-15 10:28 ` Vineet Gupta
2012-11-12 11:48 ` [RFC Patch v1 38/55] ARC: Low level event capture/logging Vineet.Gupta1
2012-11-12 13:55 ` Arnd Bergmann
2012-11-15 10:40 ` Vineet Gupta
2012-11-15 12:04 ` Arnd Bergmann
2012-12-20 6:22 ` Vineet Gupta
2012-11-12 11:48 ` [RFC Patch v1 39/55] ARC: kernel diagnostics: show_regs() etc Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 40/55] ARC: SMP support Vineet.Gupta1
2012-11-12 11:48 ` [RFC Patch v1 41/55] ARC: dwarf2 stack unwinder Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 42/55] ARC: stacktracing APIs based on dw2 unwinder Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 43/55] ARC: disassembly (needed by kprobes/kgdb/unaligned-access-emul) Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 44/55] ARC: kprobes support Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 45/55] ARC: unaligned access emulation Vineet.Gupta1
2012-11-12 14:00 ` Arnd Bergmann
2012-12-20 6:59 ` Vineet Gupta
2012-12-20 10:30 ` Vineet Gupta
2012-12-20 10:34 ` Geert Uytterhoeven
[not found] ` <1356001898-2960-1-git-send-email-vgupta@synopsys.com>
2012-12-20 11:11 ` [PATCH] sysctl: convert arch specific unaligned access regulators to generic ones Vineet.Gupta1
2013-01-03 6:47 ` [RESEND PATCH] Convert IA64 sysctl to generic Vineet Gupta
2013-01-03 6:47 ` [RESEND PATCH] sysctl: Enable IA64 "ignore-unaligned-usertrap" to be used cross-arch Vineet Gupta
2013-01-08 23:43 ` Tony Luck
2013-01-09 14:14 ` Vineet Gupta
2013-01-09 14:36 ` [PATCH v2] " Vineet Gupta
2013-01-09 18:55 ` Tony Luck
2013-01-09 21:03 ` Eric W. Biederman
2013-01-10 4:13 ` Vineet Gupta
2013-01-03 6:59 ` [RESEND PATCH] Convert PARISC sysctl to be generic Vineet Gupta
2013-01-03 6:59 ` [RESEND PATCH] sysctl: Enable PARISC "unaligned-trap" to be used cross-arch Vineet Gupta
2013-01-15 22:03 ` Helge Deller
2012-12-20 8:08 ` [RFC Patch v1 45/55] ARC: unaligned access emulation Vineet Gupta
2012-12-20 8:51 ` Arnd Bergmann
2012-11-12 11:49 ` [RFC Patch v1 46/55] ARC: kgdb support Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 47/55] ARC: startup #2: Verbose Boot reporting / feature verification Vineet.Gupta1
2012-11-12 11:49 ` Vineet.Gupta1 [this message]
2012-11-12 14:02 ` [RFC Patch v1 48/55] ARC: [plat-arfpga] BVCI Latency Unit setup Arnd Bergmann
2013-01-17 5:08 ` Vineet Gupta
2012-11-12 11:49 ` [RFC Patch v1 49/55] perf, ARC: Enable building perf tools for ARC Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 50/55] ARC: perf support (software counters only) Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 51/55] modpost: Ignore ARC specific non-alloc section Vineet.Gupta1
2012-12-27 10:47 ` [RESEND PATCH] modpost: For ARC Port submission Vineet Gupta
2012-12-27 10:47 ` [PATCH] modpost: Ignore ARC specific non-alloc sections Vineet Gupta
2012-12-27 20:48 ` Sam Ravnborg
2012-12-28 4:42 ` Vineet Gupta
2013-01-02 0:49 ` Rusty Russell
2013-01-02 5:16 ` Vineet Gupta
2012-11-12 11:49 ` [RFC Patch v1 52/55] ARC: Support for single cycle Close Coupled Mem (CCM) Vineet.Gupta1
2012-11-12 14:10 ` Arnd Bergmann
2013-01-17 5:09 ` Vineet Gupta
2013-01-17 10:53 ` Arnd Bergmann
2012-11-12 11:49 ` [RFC Patch v1 53/55] ARC: Hostlink Pseudo-Driver for Metaware Debugger Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 54/55] ARC: [plat-arcfpga] defconfig Vineet.Gupta1
2012-11-12 11:49 ` [RFC Patch v1 55/55] ARC: Add self to MAINTAINERS Vineet.Gupta1
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