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https://github.com/AsahiLinux/u-boot
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3e1b59cf3b
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>
124 lines
2.3 KiB
C
124 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
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* Dave Gerlach <d-gerlach@ti.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <soc.h>
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#include <asm/io.h>
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#define AM65X 0xbb5a
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#define J721E 0xbb64
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#define REV_SR1_0 0
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#define REV_SR2_0 1
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#define JTAG_ID_VARIANT_SHIFT 28
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#define JTAG_ID_VARIANT_MASK (0xf << 28)
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#define JTAG_ID_PARTNO_SHIFT 12
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#define JTAG_ID_PARTNO_MASK (0xffff << 12)
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struct soc_ti_k3_platdata {
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const char *family;
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const char *revision;
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};
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static const char *get_family_string(u32 idreg)
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{
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const char *family;
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u32 soc;
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soc = (idreg & JTAG_ID_PARTNO_MASK) >> JTAG_ID_PARTNO_SHIFT;
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switch (soc) {
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case AM65X:
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family = "AM65X";
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break;
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case J721E:
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family = "J721E";
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break;
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default:
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family = "Unknown Silicon";
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};
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return family;
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}
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static const char *get_rev_string(u32 idreg)
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{
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const char *revision;
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u32 rev;
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rev = (idreg & JTAG_ID_VARIANT_MASK) >> JTAG_ID_VARIANT_SHIFT;
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switch (rev) {
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case REV_SR1_0:
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revision = "1.0";
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break;
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case REV_SR2_0:
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revision = "2.0";
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break;
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default:
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revision = "Unknown Revision";
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};
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return revision;
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}
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static int soc_ti_k3_get_family(struct udevice *dev, char *buf, int size)
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{
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struct soc_ti_k3_platdata *plat = dev_get_platdata(dev);
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snprintf(buf, size, "%s", plat->family);
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return 0;
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}
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static int soc_ti_k3_get_revision(struct udevice *dev, char *buf, int size)
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{
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struct soc_ti_k3_platdata *plat = dev_get_platdata(dev);
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snprintf(buf, size, "SR%s", plat->revision);
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return 0;
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}
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static const struct soc_ops soc_ti_k3_ops = {
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.get_family = soc_ti_k3_get_family,
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.get_revision = soc_ti_k3_get_revision,
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};
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int soc_ti_k3_probe(struct udevice *dev)
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{
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struct soc_ti_k3_platdata *plat = dev_get_platdata(dev);
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u32 idreg;
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void *idreg_addr;
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idreg_addr = dev_read_addr_ptr(dev);
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if (!idreg_addr)
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return -EINVAL;
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idreg = readl(idreg_addr);
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plat->family = get_family_string(idreg);
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plat->revision = get_rev_string(idreg);
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return 0;
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}
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static const struct udevice_id soc_ti_k3_ids[] = {
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{ .compatible = "ti,am654-chipid" },
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{ }
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};
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U_BOOT_DRIVER(soc_ti_k3) = {
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.name = "soc_ti_k3",
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.id = UCLASS_SOC,
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.ops = &soc_ti_k3_ops,
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.of_match = soc_ti_k3_ids,
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.probe = soc_ti_k3_probe,
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.platdata_auto_alloc_size = sizeof(struct soc_ti_k3_platdata),
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};
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