grub2/0021-arm-coreboot-Support-for-vexpress-timer.patch

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From 5a865b37866ee8cd64c080bc6fb1e537f8e2b3c6 Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Mon, 8 May 2017 21:26:36 +0200
Subject: [PATCH 021/227] arm-coreboot: Support for vexpress timer.
---
grub-core/kern/arm/coreboot/timer.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/grub-core/kern/arm/coreboot/timer.c b/grub-core/kern/arm/coreboot/timer.c
index ebefb99d58f..d97b844f848 100644
--- a/grub-core/kern/arm/coreboot/timer.c
+++ b/grub-core/kern/arm/coreboot/timer.c
@@ -21,6 +21,7 @@
#include <grub/types.h>
#include <grub/err.h>
#include <grub/time.h>
+#include <grub/fdtbus.h>
#include <grub/misc.h>
grub_uint64_t
@@ -33,6 +34,39 @@ grub_uint32_t
grub_arm_pfr1(void);
static int have_timer = 0;
+static volatile grub_uint32_t *sp804_regs;
+
+static grub_uint64_t
+sp804_get_time_ms (void)
+{
+ static grub_uint32_t high, last_low;
+ grub_uint32_t low = ~sp804_regs[1];
+ if (last_low > low)
+ high++;
+ last_low = low;
+ return grub_divmod64 ((((grub_uint64_t) high) << 32) | low,
+ 1000, 0);
+}
+
+static grub_err_t
+sp804_attach(const struct grub_fdtbus_dev *dev)
+{
+ if (have_timer)
+ return GRUB_ERR_NONE;
+ sp804_regs = grub_fdtbus_map_reg (dev, 0, 0);
+ if (!grub_fdtbus_is_mapping_valid (sp804_regs))
+ return grub_error (GRUB_ERR_IO, "could not map sp804: %p", sp804_regs);
+ grub_install_get_time_ms (sp804_get_time_ms);
+ have_timer = 1;
+ return GRUB_ERR_NONE;
+}
+
+struct grub_fdtbus_driver sp804 =
+{
+ .compatible = "arm,sp804",
+ .attach = sp804_attach
+};
+
static grub_uint32_t timer_frequency_in_khz;
static grub_uint64_t
@@ -58,6 +92,8 @@ try_generic_timer (void)
void
grub_machine_timer_init (void)
{
+ grub_fdtbus_register (&sp804);
+
if (!have_timer)
try_generic_timer ();
if (!have_timer)
--
2.15.0