1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2022, NVIDIA Corporation.
4 */
5
6#include <linux/dev_printk.h>
7#include <linux/device.h>
8#include <linux/iopoll.h>
9#include <linux/of.h>
10
11#include "riscv.h"
12
13#define RISCV_CPUCTL 0x4388
14#define RISCV_CPUCTL_STARTCPU_TRUE (1 << 0)
15#define RISCV_BR_RETCODE 0x465c
16#define RISCV_BR_RETCODE_RESULT_V(x) ((x) & 0x3)
17#define RISCV_BR_RETCODE_RESULT_PASS_V 3
18#define RISCV_BCR_CTRL 0x4668
19#define RISCV_BCR_CTRL_CORE_SELECT_RISCV (1 << 4)
20#define RISCV_BCR_DMACFG 0x466c
21#define RISCV_BCR_DMACFG_TARGET_LOCAL_FB (0 << 0)
22#define RISCV_BCR_DMACFG_LOCK_LOCKED (1 << 31)
23#define RISCV_BCR_DMAADDR_PKCPARAM_LO 0x4670
24#define RISCV_BCR_DMAADDR_PKCPARAM_HI 0x4674
25#define RISCV_BCR_DMAADDR_FMCCODE_LO 0x4678
26#define RISCV_BCR_DMAADDR_FMCCODE_HI 0x467c
27#define RISCV_BCR_DMAADDR_FMCDATA_LO 0x4680
28#define RISCV_BCR_DMAADDR_FMCDATA_HI 0x4684
29#define RISCV_BCR_DMACFG_SEC 0x4694
30#define RISCV_BCR_DMACFG_SEC_GSCID(v) ((v) << 16)
31
32static void riscv_writel(struct tegra_drm_riscv *riscv, u32 value, u32 offset)
33{
34 writel(val: value, addr: riscv->regs + offset);
35}
36
37int tegra_drm_riscv_read_descriptors(struct tegra_drm_riscv *riscv)
38{
39 struct tegra_drm_riscv_descriptor *bl = &riscv->bl_desc;
40 struct tegra_drm_riscv_descriptor *os = &riscv->os_desc;
41 const struct device_node *np = riscv->dev->of_node;
42 int err;
43
44#define READ_PROP(name, location) \
45 err = of_property_read_u32(np, name, location); \
46 if (err) { \
47 dev_err(riscv->dev, "failed to read " name ": %d\n", err); \
48 return err; \
49 }
50
51 READ_PROP("nvidia,bl-manifest-offset", &bl->manifest_offset);
52 READ_PROP("nvidia,bl-code-offset", &bl->code_offset);
53 READ_PROP("nvidia,bl-data-offset", &bl->data_offset);
54 READ_PROP("nvidia,os-manifest-offset", &os->manifest_offset);
55 READ_PROP("nvidia,os-code-offset", &os->code_offset);
56 READ_PROP("nvidia,os-data-offset", &os->data_offset);
57#undef READ_PROP
58
59 if (bl->manifest_offset == 0 && bl->code_offset == 0 &&
60 bl->data_offset == 0 && os->manifest_offset == 0 &&
61 os->code_offset == 0 && os->data_offset == 0) {
62 dev_err(riscv->dev, "descriptors not available\n");
63 return -EINVAL;
64 }
65
66 return 0;
67}
68
69int tegra_drm_riscv_boot_bootrom(struct tegra_drm_riscv *riscv, phys_addr_t image_address,
70 u32 gscid, const struct tegra_drm_riscv_descriptor *desc)
71{
72 phys_addr_t addr;
73 int err;
74 u32 val;
75
76 riscv_writel(riscv, RISCV_BCR_CTRL_CORE_SELECT_RISCV, RISCV_BCR_CTRL);
77
78 addr = image_address + desc->manifest_offset;
79 riscv_writel(riscv, lower_32_bits(addr >> 8), RISCV_BCR_DMAADDR_PKCPARAM_LO);
80 riscv_writel(riscv, upper_32_bits(addr >> 8), RISCV_BCR_DMAADDR_PKCPARAM_HI);
81
82 addr = image_address + desc->code_offset;
83 riscv_writel(riscv, lower_32_bits(addr >> 8), RISCV_BCR_DMAADDR_FMCCODE_LO);
84 riscv_writel(riscv, upper_32_bits(addr >> 8), RISCV_BCR_DMAADDR_FMCCODE_HI);
85
86 addr = image_address + desc->data_offset;
87 riscv_writel(riscv, lower_32_bits(addr >> 8), RISCV_BCR_DMAADDR_FMCDATA_LO);
88 riscv_writel(riscv, upper_32_bits(addr >> 8), RISCV_BCR_DMAADDR_FMCDATA_HI);
89
90 riscv_writel(riscv, RISCV_BCR_DMACFG_SEC_GSCID(gscid), RISCV_BCR_DMACFG_SEC);
91 riscv_writel(riscv,
92 RISCV_BCR_DMACFG_TARGET_LOCAL_FB | RISCV_BCR_DMACFG_LOCK_LOCKED, RISCV_BCR_DMACFG);
93
94 riscv_writel(riscv, RISCV_CPUCTL_STARTCPU_TRUE, RISCV_CPUCTL);
95
96 err = readl_poll_timeout(
97 riscv->regs + RISCV_BR_RETCODE, val,
98 RISCV_BR_RETCODE_RESULT_V(val) == RISCV_BR_RETCODE_RESULT_PASS_V,
99 10, 100000);
100 if (err) {
101 dev_err(riscv->dev, "error during bootrom execution. BR_RETCODE=%d\n", val);
102 return err;
103 }
104
105 return 0;
106}
107

source code of linux/drivers/gpu/drm/tegra/riscv.c