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From 5a865b37866ee8cd64c080bc6fb1e537f8e2b3c6 Mon Sep 17 00:00:00 2001
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From: Vladimir Serbinenko <phcoder@gmail.com>
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Date: Mon, 8 May 2017 21:26:36 +0200
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Subject: [PATCH 021/192] arm-coreboot: Support for vexpress timer.
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---
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grub-core/kern/arm/coreboot/timer.c | 36 ++++++++++++++++++++++++++++++++++++
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1 file changed, 36 insertions(+)
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diff --git a/grub-core/kern/arm/coreboot/timer.c b/grub-core/kern/arm/coreboot/timer.c
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index ebefb99d5..d97b844f8 100644
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--- a/grub-core/kern/arm/coreboot/timer.c
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+++ b/grub-core/kern/arm/coreboot/timer.c
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@@ -21,6 +21,7 @@
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/time.h>
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+#include <grub/fdtbus.h>
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#include <grub/misc.h>
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grub_uint64_t
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@@ -33,6 +34,39 @@ grub_uint32_t
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grub_arm_pfr1(void);
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static int have_timer = 0;
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+static volatile grub_uint32_t *sp804_regs;
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+
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+static grub_uint64_t
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+sp804_get_time_ms (void)
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+{
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+ static grub_uint32_t high, last_low;
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+ grub_uint32_t low = ~sp804_regs[1];
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+ if (last_low > low)
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+ high++;
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+ last_low = low;
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+ return grub_divmod64 ((((grub_uint64_t) high) << 32) | low,
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+ 1000, 0);
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+}
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+
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+static grub_err_t
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+sp804_attach(const struct grub_fdtbus_dev *dev)
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+{
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+ if (have_timer)
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+ return GRUB_ERR_NONE;
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+ sp804_regs = grub_fdtbus_map_reg (dev, 0, 0);
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+ if (!grub_fdtbus_is_mapping_valid (sp804_regs))
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+ return grub_error (GRUB_ERR_IO, "could not map sp804: %p", sp804_regs);
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+ grub_install_get_time_ms (sp804_get_time_ms);
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+ have_timer = 1;
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+ return GRUB_ERR_NONE;
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+}
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+
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+struct grub_fdtbus_driver sp804 =
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+{
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+ .compatible = "arm,sp804",
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+ .attach = sp804_attach
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+};
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+
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static grub_uint32_t timer_frequency_in_khz;
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static grub_uint64_t
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@@ -58,6 +92,8 @@ try_generic_timer (void)
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void
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grub_machine_timer_init (void)
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{
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+ grub_fdtbus_register (&sp804);
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+
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if (!have_timer)
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try_generic_timer ();
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if (!have_timer)
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--
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2.13.4
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