[U-Boot,v7,12/15] cpu: Bind timer driver for boot hart

Message ID 20190211054030.21393-13-anup.patel@wdc.com
State Superseded
Delegated to: Andes
Headers show
Series
  • SiFive FU540 Support
Related show

Commit Message

Anup Patel Feb. 11, 2019, 5:43 a.m.
From: Atish Patra <atish.patra@wdc.com>

Currently, timer driver is bound only for hart0.

There is no mandatory requirement that hart0 should always
come up. In fact, HiFive Unleashed SoC hart0 doesn't boot
in S-mode because it only has M-mode.

The timer driver should be bound for boot hart.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
---
 drivers/cpu/riscv_cpu.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/cpu/riscv_cpu.c b/drivers/cpu/riscv_cpu.c
index 5e15df590e..f77c126499 100644
--- a/drivers/cpu/riscv_cpu.c
+++ b/drivers/cpu/riscv_cpu.c
@@ -10,6 +10,8 @@ 
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 static int riscv_cpu_get_desc(struct udevice *dev, char *buf, int size)
 {
 	const char *isa;
@@ -62,7 +64,6 @@  static int riscv_cpu_bind(struct udevice *dev)
 
 	/* save the hart id */
 	plat->cpu_id = dev_read_addr(dev);
-
 	/* first examine the property in current cpu node */
 	ret = dev_read_u32(dev, "timebase-frequency", &plat->timebase_freq);
 	/* if not found, then look at the parent /cpus node */
@@ -71,7 +72,7 @@  static int riscv_cpu_bind(struct udevice *dev)
 			     &plat->timebase_freq);
 
 	/*
-	 * Bind riscv-timer driver on hart 0
+	 * Bind riscv-timer driver on boot hart.
 	 *
 	 * We only instantiate one timer device which is enough for U-Boot.
 	 * Pass the "timebase-frequency" value as the driver data for the
@@ -80,7 +81,7 @@  static int riscv_cpu_bind(struct udevice *dev)
 	 * Return value is not checked since it's possible that the timer
 	 * driver is not included.
 	 */
-	if (!plat->cpu_id && plat->timebase_freq) {
+	if (plat->cpu_id == gd->arch.boot_hart && plat->timebase_freq) {
 		drv = lists_driver_lookup_name("riscv_timer");
 		if (!drv) {
 			debug("Cannot find the timer driver, not included?\n");