[U-Boot] [PATCH v6 21/34] imx8: cpu: add uclass based CPU driver
Anatolij Gustschin
agust at denx.de
Thu Oct 18 12:28:24 UTC 2018
print_cpuinfo() in board init code requires uclass CPU driver,
add it to be able to display CPU info when CONFIG_DISPLAY_CPUINFO
option is enabled. CPU node in DT will have to include 'clocks'
and 'u-boot,dm-pre-reloc' properties for generic print_cpuinfo()
to work as expected. The driver outputs info for i.MX8QXP Rev A
and Rev B CPUs.
Signed-off-by: Anatolij Gustschin <agust at denx.de>
Cc: Stefano Babic <sbabic at denx.de>
---
arch/arm/include/asm/arch-imx/cpu.h | 5 +-
arch/arm/mach-imx/imx8/cpu.c | 215 ++++++++++++++++++----------
2 files changed, 142 insertions(+), 78 deletions(-)
diff --git a/arch/arm/include/asm/arch-imx/cpu.h b/arch/arm/include/asm/arch-imx/cpu.h
index cf6303c3f5..2af79659d2 100644
--- a/arch/arm/include/asm/arch-imx/cpu.h
+++ b/arch/arm/include/asm/arch-imx/cpu.h
@@ -25,6 +25,7 @@
#define MXC_CPU_MX7S 0x71 /* dummy ID */
#define MXC_CPU_MX7D 0x72
#define MXC_CPU_MX8MQ 0x82
+#define MXC_CPU_IMX8QXP_A0 0x90 /* dummy ID */
#define MXC_CPU_IMX8QXP 0x92 /* dummy ID */
#define MXC_CPU_MX7ULP 0xE1 /* Temporally hard code */
#define MXC_CPU_VF610 0xF6 /* dummy ID */
@@ -43,8 +44,8 @@
#define CHIP_REV_2_5 0x25
#define CHIP_REV_3_0 0x30
-#define CHIP_REV_A 0x0
-#define CHIP_REV_B 0x1
+#define CHIP_REV_A 0x0
+#define CHIP_REV_B 0x1
#define BOARD_REV_1_0 0x0
#define BOARD_REV_2_0 0x1
diff --git a/arch/arm/mach-imx/imx8/cpu.c b/arch/arm/mach-imx/imx8/cpu.c
index da34a94a23..f093f34ca5 100644
--- a/arch/arm/mach-imx/imx8/cpu.c
+++ b/arch/arm/mach-imx/imx8/cpu.c
@@ -5,6 +5,7 @@
#include <common.h>
#include <clk.h>
+#include <cpu.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
@@ -19,82 +20,6 @@
DECLARE_GLOBAL_DATA_PTR;
-u32 get_cpu_rev(void)
-{
- u32 id = 0, rev = 0;
- int ret;
-
- ret = sc_misc_get_control(-1, SC_R_SYSTEM, SC_C_ID, &id);
- if (ret)
- return 0;
-
- rev = (id >> 5) & 0xf;
- id = (id & 0x1f) + MXC_SOC_IMX8; /* Dummy ID for chip */
-
- return (id << 12) | rev;
-}
-
-#ifdef CONFIG_DISPLAY_CPUINFO
-const char *get_imx8_type(u32 imxtype)
-{
- switch (imxtype) {
- case MXC_CPU_IMX8QXP:
- return "8QXP";
- default:
- return "??";
- }
-}
-
-const char *get_imx8_rev(u32 rev)
-{
- switch (rev) {
- case CHIP_REV_A:
- return "A";
- case CHIP_REV_B:
- return "B";
- default:
- return "?";
- }
-}
-
-const char *get_core_name(void)
-{
- if (is_cortex_a35())
- return "A35";
- else
- return "?";
-}
-
-int print_cpuinfo(void)
-{
- struct udevice *dev;
- struct clk cpu_clk;
- int ret;
-
- ret = uclass_get_device(UCLASS_CPU, 0, &dev);
- if (ret)
- return 0;
-
- ret = clk_get_by_index(dev, 0, &cpu_clk);
- if (ret) {
- dev_err(dev, "failed to clk\n");
- return 0;
- }
-
- u32 cpurev;
-
- cpurev = get_cpu_rev();
-
- printf("CPU: Freescale i.MX%s rev%s %s at %ld MHz\n",
- get_imx8_type((cpurev & 0xFF000) >> 12),
- get_imx8_rev((cpurev & 0xFFF)),
- get_core_name(),
- clk_get_rate(&cpu_clk) / 1000000);
-
- return 0;
-}
-#endif
-
#define BT_PASSOVER_TAG 0x504F
struct pass_over_info_t *get_pass_over_info(void)
{
@@ -581,3 +506,141 @@ void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
err:
printf("%s: fuse %d, err: %d\n", __func__, word[i], ret);
}
+
+#if CONFIG_IS_ENABLED(CPU)
+struct cpu_imx_platdata {
+ const char *name;
+ const char *rev;
+ const char *type;
+ u32 cpurev;
+ u32 freq_mhz;
+};
+
+u32 get_cpu_rev(void)
+{
+ u32 id = 0, rev = 0;
+ int ret;
+
+ ret = sc_misc_get_control(-1, SC_R_SYSTEM, SC_C_ID, &id);
+ if (ret)
+ return 0;
+
+ rev = (id >> 5) & 0xf;
+ id = (id & 0x1f) + MXC_SOC_IMX8; /* Dummy ID for chip */
+
+ return (id << 12) | rev;
+}
+
+const char *get_imx8_type(u32 imxtype)
+{
+ switch (imxtype) {
+ case MXC_CPU_IMX8QXP:
+ case MXC_CPU_IMX8QXP_A0:
+ return "QXP";
+ default:
+ return "??";
+ }
+}
+
+const char *get_imx8_rev(u32 rev)
+{
+ switch (rev) {
+ case CHIP_REV_A:
+ return "A";
+ case CHIP_REV_B:
+ return "B";
+ default:
+ return "?";
+ }
+}
+
+const char *get_core_name(void)
+{
+ if (is_cortex_a35())
+ return "A35";
+ else if (is_cortex_a53())
+ return "A53";
+ else if (is_cortex_a72())
+ return "A72";
+ else
+ return "?";
+}
+
+int cpu_imx_get_desc(struct udevice *dev, char *buf, int size)
+{
+ struct cpu_imx_platdata *plat = dev_get_platdata(dev);
+
+ if (size < 100)
+ return -ENOSPC;
+
+ snprintf(buf, size, "CPU: Freescale i.MX8%s Rev%s %s at %u MHz\n",
+ plat->type, plat->rev, plat->name, plat->freq_mhz);
+
+ return 0;
+}
+
+static int cpu_imx_get_info(struct udevice *dev, struct cpu_info *info)
+{
+ struct cpu_imx_platdata *plat = dev_get_platdata(dev);
+
+ info->cpu_freq = plat->freq_mhz * 1000;
+ info->features = BIT(CPU_FEAT_L1_CACHE) | BIT(CPU_FEAT_MMU);
+ return 0;
+}
+
+static int cpu_imx_get_count(struct udevice *dev)
+{
+ return 4;
+}
+
+static int cpu_imx_get_vendor(struct udevice *dev, char *buf, int size)
+{
+ snprintf(buf, size, "NXP");
+ return 0;
+}
+
+static const struct cpu_ops cpu_imx8_ops = {
+ .get_desc = cpu_imx_get_desc,
+ .get_info = cpu_imx_get_info,
+ .get_count = cpu_imx_get_count,
+ .get_vendor = cpu_imx_get_vendor,
+};
+
+static const struct udevice_id cpu_imx8_ids[] = {
+ { .compatible = "arm,cortex-a35" },
+ { }
+};
+
+static int imx8_cpu_probe(struct udevice *dev)
+{
+ struct cpu_imx_platdata *plat = dev_get_platdata(dev);
+ struct clk cpu_clk;
+ u32 cpurev;
+ int ret;
+
+ cpurev = get_cpu_rev();
+ plat->cpurev = cpurev;
+ plat->name = get_core_name();
+ plat->rev = get_imx8_rev(cpurev & 0xFFF);
+ plat->type = get_imx8_type((cpurev & 0xFF000) >> 12);
+
+ ret = clk_get_by_index(dev, 0, &cpu_clk);
+ if (ret) {
+ debug("%s: Failed to get CPU clk: %d\n", __func__, ret);
+ return 0;
+ }
+
+ plat->freq_mhz = clk_get_rate(&cpu_clk) / 1000000;
+ return 0;
+}
+
+U_BOOT_DRIVER(cpu_imx8_drv) = {
+ .name = "imx8x_cpu",
+ .id = UCLASS_CPU,
+ .of_match = cpu_imx8_ids,
+ .ops = &cpu_imx8_ops,
+ .probe = imx8_cpu_probe,
+ .platdata_auto_alloc_size = sizeof(struct cpu_imx_platdata),
+ .flags = DM_FLAG_PRE_RELOC,
+};
+#endif
--
2.17.1
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