cpu: at91: add driver for CPU
Add basic CPU driver use to retrieve information about CPU itself.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 85e5185..91b06b4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -291,6 +291,7 @@
T: git https://gitlab.denx.de/u-boot/custodians/u-boot-atmel.git
F: arch/arm/mach-at91/
F: board/atmel/
+F: drivers/cpu/at91_cpu.c
F: drivers/misc/microchip_flexcom.c
F: drivers/timer/mchp-pit64b-timer.c
diff --git a/drivers/cpu/Makefile b/drivers/cpu/Makefile
index 0b5dbc7..c853263 100644
--- a/drivers/cpu/Makefile
+++ b/drivers/cpu/Makefile
@@ -8,6 +8,7 @@
obj-$(CONFIG_ARCH_BMIPS) += bmips_cpu.o
obj-$(CONFIG_ARCH_IMX8) += imx8_cpu.o
+obj-$(CONFIG_ARCH_AT91) += at91_cpu.o
obj-$(CONFIG_CPU_MPC83XX) += mpc83xx_cpu.o
obj-$(CONFIG_CPU_RISCV) += riscv_cpu.o
obj-$(CONFIG_SANDBOX) += cpu_sandbox.o
diff --git a/drivers/cpu/at91_cpu.c b/drivers/cpu/at91_cpu.c
new file mode 100644
index 0000000..058ae3a
--- /dev/null
+++ b/drivers/cpu/at91_cpu.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Claudiu Beznea <claudiu.beznea@microchip.com>
+ */
+
+#include <common.h>
+#include <cpu.h>
+#include <dm.h>
+#include <div64.h>
+#include <linux/clk-provider.h>
+
+struct at91_cpu_platdata {
+ const char *name;
+ ulong cpufreq_mhz;
+ ulong mckfreq_mhz;
+ ulong xtalfreq_mhz;
+};
+
+extern char *get_cpu_name(void);
+
+const char *at91_cpu_get_name(void)
+{
+ return get_cpu_name();
+}
+
+int at91_cpu_get_desc(const struct udevice *dev, char *buf, int size)
+{
+ struct at91_cpu_platdata *plat = dev_get_platdata(dev);
+
+ snprintf(buf, size, "%s\n"
+ "Crystal frequency: %8lu MHz\n"
+ "CPU clock : %8lu MHz\n"
+ "Master clock : %8lu MHz\n",
+ plat->name, plat->xtalfreq_mhz, plat->cpufreq_mhz,
+ plat->mckfreq_mhz);
+
+ return 0;
+}
+
+static int at91_cpu_get_info(const struct udevice *dev, struct cpu_info *info)
+{
+ struct at91_cpu_platdata *plat = dev_get_platdata(dev);
+
+ info->cpu_freq = plat->cpufreq_mhz * 1000000;
+ info->features = BIT(CPU_FEAT_L1_CACHE);
+
+ return 0;
+}
+
+static int at91_cpu_get_count(const struct udevice *dev)
+{
+ return 1;
+}
+
+static int at91_cpu_get_vendor(const struct udevice *dev, char *buf, int size)
+{
+ snprintf(buf, size, "Microchip Technology Inc.");
+
+ return 0;
+}
+
+static const struct cpu_ops at91_cpu_ops = {
+ .get_desc = at91_cpu_get_desc,
+ .get_info = at91_cpu_get_info,
+ .get_count = at91_cpu_get_count,
+ .get_vendor = at91_cpu_get_vendor,
+};
+
+static const struct udevice_id at91_cpu_ids[] = {
+ { .compatible = "arm,cortex-a7" },
+ { /* Sentinel. */ }
+};
+
+static int at91_cpu_probe(struct udevice *dev)
+{
+ struct at91_cpu_platdata *plat = dev_get_platdata(dev);
+ struct clk clk;
+ ulong rate;
+ int ret;
+
+ ret = clk_get_by_index(dev, 0, &clk);
+ if (ret)
+ return ret;
+
+ rate = clk_get_rate(&clk);
+ if (!rate)
+ return -ENOTSUPP;
+ plat->cpufreq_mhz = DIV_ROUND_CLOSEST_ULL(rate, 1000000);
+
+ ret = clk_get_by_index(dev, 1, &clk);
+ if (ret)
+ return ret;
+
+ rate = clk_get_rate(&clk);
+ if (!rate)
+ return -ENOTSUPP;
+ plat->mckfreq_mhz = DIV_ROUND_CLOSEST_ULL(rate, 1000000);
+
+ ret = clk_get_by_index(dev, 2, &clk);
+ if (ret)
+ return ret;
+
+ rate = clk_get_rate(&clk);
+ if (!rate)
+ return -ENOTSUPP;
+ plat->xtalfreq_mhz = DIV_ROUND_CLOSEST_ULL(rate, 1000000);
+
+ plat->name = get_cpu_name();
+
+ return 0;
+}
+
+U_BOOT_DRIVER(cpu_at91_drv) = {
+ .name = "at91-cpu",
+ .id = UCLASS_CPU,
+ .of_match = at91_cpu_ids,
+ .ops = &at91_cpu_ops,
+ .probe = at91_cpu_probe,
+ .platdata_auto_alloc_size = sizeof(struct at91_cpu_platdata),
+ .flags = DM_FLAG_PRE_RELOC,
+};