dm: soc: Introduce soc_ti_k3 driver for TI K3 SoCs

Introduce an soc_ti_k3_driver that allows identification and selection
of SoC specific data based on the JTAG ID register for device
identification, as described for AM65x[0] and J721E[1] devices.

[0] http://www.ti.com/lit/ug/spruid7e/spruid7e.pdf
[1] http://www.ti.com/lit/ug/spruil1a/spruil1a.pdf

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>

diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index e715dfd017121ff4c6638ce9743f09ed48dfefe1..864d00a885385dfd711454cb2e30562283bd9b8b 100644 (file)
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -9,6 +9,13 @@ config SOC_DEVICE
          need different parameters or quirks enabled depending on the
          specific device variant in use.
 
+config SOC_DEVICE_TI_K3
+       depends on SOC_DEVICE
+       bool "Enable SoC Device ID driver for TI K3 SoCs"
+       help
+         This allows Texas Instruments Keystone 3 SoCs to identify
+         specifics about the SoC in use.
+
 source "drivers/soc/ti/Kconfig"
 
 endmenu

diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 649e92b3906d5bec76fa0737488212dc0051f2df..9ef20ca5066fe6e39dc23a48cc32de745ddecf69 100644 (file)
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -4,4 +4,5 @@
 
 obj-$(CONFIG_SOC_TI) += ti/
 obj-$(CONFIG_SOC_DEVICE) += soc-uclass.o
+obj-$(CONFIG_SOC_DEVICE_TI_K3) += soc_ti_k3.o
 obj-$(CONFIG_SANDBOX) += soc_sandbox.o

diff --git a/drivers/soc/soc_ti_k3.c b/drivers/soc/soc_ti_k3.c
new file mode 100644 (file)
index 0000000..ae23ef7
--- /dev/null
+++ b/drivers/soc/soc_ti_k3.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
+ *     Dave Gerlach <d-gerlach@ti.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <soc.h>
+
+#include <asm/io.h>
+
+#define AM65X                  0xbb5a
+#define J721E                  0xbb64
+
+#define REV_SR1_0              0
+#define REV_SR2_0              1
+
+#define JTAG_ID_VARIANT_SHIFT  28
+#define JTAG_ID_VARIANT_MASK   (0xf << 28)
+#define JTAG_ID_PARTNO_SHIFT   12
+#define JTAG_ID_PARTNO_MASK    (0xffff << 12)
+
+struct soc_ti_k3_platdata {
+       const char *family;
+       const char *revision;
+};
+
+static const char *get_family_string(u32 idreg)
+{
+       const char *family;
+       u32 soc;
+
+       soc = (idreg & JTAG_ID_PARTNO_MASK) >> JTAG_ID_PARTNO_SHIFT;
+
+       switch (soc) {
+       case AM65X:
+               family = "AM65X";
+               break;
+       case J721E:
+               family = "J721E";
+               break;
+       default:
+               family = "Unknown Silicon";
+       };
+
+       return family;
+}
+
+static const char *get_rev_string(u32 idreg)
+{
+       const char *revision;
+       u32 rev;
+
+       rev = (idreg & JTAG_ID_VARIANT_MASK) >> JTAG_ID_VARIANT_SHIFT;
+
+       switch (rev) {
+       case REV_SR1_0:
+               revision = "1.0";
+               break;
+       case REV_SR2_0:
+               revision = "2.0";
+               break;
+       default:
+               revision = "Unknown Revision";
+       };
+
+       return revision;
+}
+
+static int soc_ti_k3_get_family(struct udevice *dev, char *buf, int size)
+{
+       struct soc_ti_k3_platdata *plat = dev_get_platdata(dev);
+
+       snprintf(buf, size, "%s", plat->family);
+
+       return 0;
+}
+
+static int soc_ti_k3_get_revision(struct udevice *dev, char *buf, int size)
+{
+       struct soc_ti_k3_platdata *plat = dev_get_platdata(dev);
+
+       snprintf(buf, size, "SR%s", plat->revision);
+
+       return 0;
+}
+
+static const struct soc_ops soc_ti_k3_ops = {
+       .get_family = soc_ti_k3_get_family,
+       .get_revision = soc_ti_k3_get_revision,
+};
+
+int soc_ti_k3_probe(struct udevice *dev)
+{
+       struct soc_ti_k3_platdata *plat = dev_get_platdata(dev);
+       u32 idreg;
+       void *idreg_addr;
+
+       idreg_addr = dev_read_addr_ptr(dev);
+       if (!idreg_addr)
+               return -EINVAL;
+
+       idreg = readl(idreg_addr);
+
+       plat->family = get_family_string(idreg);
+       plat->revision = get_rev_string(idreg);
+
+       return 0;
+}
+
+static const struct udevice_id soc_ti_k3_ids[] = {
+       { .compatible = "ti,am654-chipid" },
+       { }
+};
+
+U_BOOT_DRIVER(soc_ti_k3) = {
+       .name           = "soc_ti_k3",
+       .id             = UCLASS_SOC,
+       .ops            = &soc_ti_k3_ops,
+       .of_match       = soc_ti_k3_ids,
+       .probe          = soc_ti_k3_probe,
+       .platdata_auto_alloc_size = sizeof(struct soc_ti_k3_platdata),
+};