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https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
969251a5a4
The cmd "cpu detail" fetches uninitialized cpu feature information
and thus displays wrong / inconsitent details as below.
For eg: FU540-C000 doesn't have any microcode, yet the cmd display's it.
=> cpu detail
1: cpu@1 rv64imafdc
ID = 1, freq = 999.100 MHz: L1 cache, MMU, Microcode, Device ID
Microcode version 0x0
Device ID 0x0
2: cpu@2 rv64imafdc
ID = 2, freq = 999.100 MHz: L1 cache, MMU, Microcode, Device ID
Microcode version 0x0
Device ID 0x0
3: cpu@3 rv64imafdc
ID = 3, freq = 999.100 MHz: L1 cache, MMU, Microcode, Device ID
Microcode version 0x0
Device ID 0x0
4: cpu@4 rv64imafdc
ID = 4, freq = 999.100 MHz: L1 cache, MMU, Microcode, Device ID
Microcode version 0x0
Device ID 0x0
The L1 cache or MMU entry seen above is also displayed inconsistently.
So initialize cpu information to zero into cpu-uclass itself so that
similar issues can be avoided for other CPU drivers.
We now see correct features as:
=> cpu detail
1: cpu@1 rv64imafdc
ID = 1, freq = 999.100 MHz
2: cpu@2 rv64imafdc
ID = 2, freq = 999.100 MHz
3: cpu@3 rv64imafdc
ID = 3, freq = 999.100 MHz
4: cpu@4 rv64imafdc
ID = 4, freq = 999.100 MHz
Signed-off-by: Sagar Shrikant Kadam <sagar.kadam@sifive.com>
Reviewed-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
143 lines
2.5 KiB
C
143 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <cpu.h>
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#include <dm.h>
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#include <errno.h>
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#include <log.h>
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#include <dm/lists.h>
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#include <dm/root.h>
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#include <linux/err.h>
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int cpu_probe_all(void)
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{
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struct udevice *cpu;
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int ret;
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ret = uclass_first_device(UCLASS_CPU, &cpu);
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if (ret) {
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debug("%s: No CPU found (err = %d)\n", __func__, ret);
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return ret;
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}
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while (cpu) {
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ret = uclass_next_device(&cpu);
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if (ret) {
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debug("%s: Error while probing CPU (err = %d)\n",
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__func__, ret);
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return ret;
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}
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}
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return 0;
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}
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int cpu_is_current(struct udevice *cpu)
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{
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struct cpu_ops *ops = cpu_get_ops(cpu);
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if (ops->is_current) {
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if (ops->is_current(cpu))
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return 1;
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}
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return -ENOSYS;
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}
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struct udevice *cpu_get_current_dev(void)
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{
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struct udevice *cpu;
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int ret;
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uclass_foreach_dev_probe(UCLASS_CPU, cpu) {
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if (cpu_is_current(cpu) > 0)
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return cpu;
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}
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/* If can't find current cpu device, use the first dev instead */
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ret = uclass_first_device_err(UCLASS_CPU, &cpu);
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if (ret) {
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debug("%s: Could not get CPU device (err = %d)\n",
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__func__, ret);
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return NULL;
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}
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return cpu;
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}
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int cpu_get_desc(struct udevice *dev, char *buf, int size)
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{
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struct cpu_ops *ops = cpu_get_ops(dev);
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if (!ops->get_desc)
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return -ENOSYS;
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return ops->get_desc(dev, buf, size);
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}
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int cpu_get_info(struct udevice *dev, struct cpu_info *info)
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{
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struct cpu_ops *ops = cpu_get_ops(dev);
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if (!ops->get_info)
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return -ENOSYS;
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/* Init cpu_info to 0 */
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memset(info, 0, sizeof(struct cpu_info));
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return ops->get_info(dev, info);
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}
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int cpu_get_count(struct udevice *dev)
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{
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struct cpu_ops *ops = cpu_get_ops(dev);
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if (!ops->get_count)
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return -ENOSYS;
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return ops->get_count(dev);
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}
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int cpu_get_vendor(struct udevice *dev, char *buf, int size)
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{
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struct cpu_ops *ops = cpu_get_ops(dev);
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if (!ops->get_vendor)
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return -ENOSYS;
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return ops->get_vendor(dev, buf, size);
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}
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U_BOOT_DRIVER(cpu_bus) = {
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.name = "cpu_bus",
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.id = UCLASS_SIMPLE_BUS,
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.per_child_platdata_auto_alloc_size = sizeof(struct cpu_platdata),
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};
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static int uclass_cpu_init(struct uclass *uc)
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{
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struct udevice *dev;
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ofnode node;
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int ret;
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node = ofnode_path("/cpus");
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if (!ofnode_valid(node))
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return 0;
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ret = device_bind_driver_to_node(dm_root(), "cpu_bus", "cpus", node,
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&dev);
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return ret;
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}
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UCLASS_DRIVER(cpu) = {
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.id = UCLASS_CPU,
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.name = "cpu",
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.init = uclass_cpu_init,
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};
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