swh:1:snp:c3bf2749e3476071fa748f67b0ffa2fdc5fe49d9
Tip revision: b90cb1053190353cc30f0fef0ef1f378ccc063c5 authored by Linus Torvalds on 28 August 2022, 22:05:29 UTC
Linux 6.0-rc3
Linux 6.0-rc3
Tip revision: b90cb10
mtk-devapc.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 MediaTek Inc.
*/
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#define VIO_MOD_TO_REG_IND(m) ((m) / 32)
#define VIO_MOD_TO_REG_OFF(m) ((m) % 32)
struct mtk_devapc_vio_dbgs {
union {
u32 vio_dbg0;
struct {
u32 mstid:16;
u32 dmnid:6;
u32 vio_w:1;
u32 vio_r:1;
u32 addr_h:4;
u32 resv:4;
} dbg0_bits;
};
u32 vio_dbg1;
};
struct mtk_devapc_regs_ofs {
/* reg offset */
u32 vio_mask_offset;
u32 vio_sta_offset;
u32 vio_dbg0_offset;
u32 vio_dbg1_offset;
u32 apc_con_offset;
u32 vio_shift_sta_offset;
u32 vio_shift_sel_offset;
u32 vio_shift_con_offset;
};
struct mtk_devapc_data {
/* numbers of violation index */
u32 vio_idx_num;
const struct mtk_devapc_regs_ofs *regs_ofs;
};
struct mtk_devapc_context {
struct device *dev;
void __iomem *infra_base;
struct clk *infra_clk;
const struct mtk_devapc_data *data;
};
static void clear_vio_status(struct mtk_devapc_context *ctx)
{
void __iomem *reg;
int i;
reg = ctx->infra_base + ctx->data->regs_ofs->vio_sta_offset;
for (i = 0; i < VIO_MOD_TO_REG_IND(ctx->data->vio_idx_num) - 1; i++)
writel(GENMASK(31, 0), reg + 4 * i);
writel(GENMASK(VIO_MOD_TO_REG_OFF(ctx->data->vio_idx_num) - 1, 0),
reg + 4 * i);
}
static void mask_module_irq(struct mtk_devapc_context *ctx, bool mask)
{
void __iomem *reg;
u32 val;
int i;
reg = ctx->infra_base + ctx->data->regs_ofs->vio_mask_offset;
if (mask)
val = GENMASK(31, 0);
else
val = 0;
for (i = 0; i < VIO_MOD_TO_REG_IND(ctx->data->vio_idx_num) - 1; i++)
writel(val, reg + 4 * i);
val = readl(reg + 4 * i);
if (mask)
val |= GENMASK(VIO_MOD_TO_REG_OFF(ctx->data->vio_idx_num) - 1,
0);
else
val &= ~GENMASK(VIO_MOD_TO_REG_OFF(ctx->data->vio_idx_num) - 1,
0);
writel(val, reg + 4 * i);
}
#define PHY_DEVAPC_TIMEOUT 0x10000
/*
* devapc_sync_vio_dbg - do "shift" mechansim" to get full violation information.
* shift mechanism is depends on devapc hardware design.
* Mediatek devapc set multiple slaves as a group.
* When violation is triggered, violation info is kept
* inside devapc hardware.
* Driver should do shift mechansim to sync full violation
* info to VIO_DBGs registers.
*
*/
static int devapc_sync_vio_dbg(struct mtk_devapc_context *ctx)
{
void __iomem *pd_vio_shift_sta_reg;
void __iomem *pd_vio_shift_sel_reg;
void __iomem *pd_vio_shift_con_reg;
int min_shift_group;
int ret;
u32 val;
pd_vio_shift_sta_reg = ctx->infra_base +
ctx->data->regs_ofs->vio_shift_sta_offset;
pd_vio_shift_sel_reg = ctx->infra_base +
ctx->data->regs_ofs->vio_shift_sel_offset;
pd_vio_shift_con_reg = ctx->infra_base +
ctx->data->regs_ofs->vio_shift_con_offset;
/* Find the minimum shift group which has violation */
val = readl(pd_vio_shift_sta_reg);
if (!val)
return false;
min_shift_group = __ffs(val);
/* Assign the group to sync */
writel(0x1 << min_shift_group, pd_vio_shift_sel_reg);
/* Start syncing */
writel(0x1, pd_vio_shift_con_reg);
ret = readl_poll_timeout(pd_vio_shift_con_reg, val, val == 0x3, 0,
PHY_DEVAPC_TIMEOUT);
if (ret) {
dev_err(ctx->dev, "%s: Shift violation info failed\n", __func__);
return false;
}
/* Stop syncing */
writel(0x0, pd_vio_shift_con_reg);
/* Write clear */
writel(0x1 << min_shift_group, pd_vio_shift_sta_reg);
return true;
}
/*
* devapc_extract_vio_dbg - extract full violation information after doing
* shift mechanism.
*/
static void devapc_extract_vio_dbg(struct mtk_devapc_context *ctx)
{
struct mtk_devapc_vio_dbgs vio_dbgs;
void __iomem *vio_dbg0_reg;
void __iomem *vio_dbg1_reg;
vio_dbg0_reg = ctx->infra_base + ctx->data->regs_ofs->vio_dbg0_offset;
vio_dbg1_reg = ctx->infra_base + ctx->data->regs_ofs->vio_dbg1_offset;
vio_dbgs.vio_dbg0 = readl(vio_dbg0_reg);
vio_dbgs.vio_dbg1 = readl(vio_dbg1_reg);
/* Print violation information */
if (vio_dbgs.dbg0_bits.vio_w)
dev_info(ctx->dev, "Write Violation\n");
else if (vio_dbgs.dbg0_bits.vio_r)
dev_info(ctx->dev, "Read Violation\n");
dev_info(ctx->dev, "Bus ID:0x%x, Dom ID:0x%x, Vio Addr:0x%x\n",
vio_dbgs.dbg0_bits.mstid, vio_dbgs.dbg0_bits.dmnid,
vio_dbgs.vio_dbg1);
}
/*
* devapc_violation_irq - the devapc Interrupt Service Routine (ISR) will dump
* violation information including which master violates
* access slave.
*/
static irqreturn_t devapc_violation_irq(int irq_number, void *data)
{
struct mtk_devapc_context *ctx = data;
while (devapc_sync_vio_dbg(ctx))
devapc_extract_vio_dbg(ctx);
clear_vio_status(ctx);
return IRQ_HANDLED;
}
/*
* start_devapc - unmask slave's irq to start receiving devapc violation.
*/
static void start_devapc(struct mtk_devapc_context *ctx)
{
writel(BIT(31), ctx->infra_base + ctx->data->regs_ofs->apc_con_offset);
mask_module_irq(ctx, false);
}
/*
* stop_devapc - mask slave's irq to stop service.
*/
static void stop_devapc(struct mtk_devapc_context *ctx)
{
mask_module_irq(ctx, true);
writel(BIT(2), ctx->infra_base + ctx->data->regs_ofs->apc_con_offset);
}
static const struct mtk_devapc_regs_ofs devapc_regs_ofs_mt6779 = {
.vio_mask_offset = 0x0,
.vio_sta_offset = 0x400,
.vio_dbg0_offset = 0x900,
.vio_dbg1_offset = 0x904,
.apc_con_offset = 0xF00,
.vio_shift_sta_offset = 0xF10,
.vio_shift_sel_offset = 0xF14,
.vio_shift_con_offset = 0xF20,
};
static const struct mtk_devapc_data devapc_mt6779 = {
.vio_idx_num = 511,
.regs_ofs = &devapc_regs_ofs_mt6779,
};
static const struct mtk_devapc_data devapc_mt8186 = {
.vio_idx_num = 519,
.regs_ofs = &devapc_regs_ofs_mt6779,
};
static const struct of_device_id mtk_devapc_dt_match[] = {
{
.compatible = "mediatek,mt6779-devapc",
.data = &devapc_mt6779,
}, {
.compatible = "mediatek,mt8186-devapc",
.data = &devapc_mt8186,
}, {
},
};
MODULE_DEVICE_TABLE(of, mtk_devapc_dt_match);
static int mtk_devapc_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct mtk_devapc_context *ctx;
u32 devapc_irq;
int ret;
if (IS_ERR(node))
return -ENODEV;
ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->data = of_device_get_match_data(&pdev->dev);
ctx->dev = &pdev->dev;
ctx->infra_base = of_iomap(node, 0);
if (!ctx->infra_base)
return -EINVAL;
devapc_irq = irq_of_parse_and_map(node, 0);
if (!devapc_irq)
return -EINVAL;
ctx->infra_clk = devm_clk_get(&pdev->dev, "devapc-infra-clock");
if (IS_ERR(ctx->infra_clk))
return -EINVAL;
if (clk_prepare_enable(ctx->infra_clk))
return -EINVAL;
ret = devm_request_irq(&pdev->dev, devapc_irq, devapc_violation_irq,
IRQF_TRIGGER_NONE, "devapc", ctx);
if (ret) {
clk_disable_unprepare(ctx->infra_clk);
return ret;
}
platform_set_drvdata(pdev, ctx);
start_devapc(ctx);
return 0;
}
static int mtk_devapc_remove(struct platform_device *pdev)
{
struct mtk_devapc_context *ctx = platform_get_drvdata(pdev);
stop_devapc(ctx);
clk_disable_unprepare(ctx->infra_clk);
return 0;
}
static struct platform_driver mtk_devapc_driver = {
.probe = mtk_devapc_probe,
.remove = mtk_devapc_remove,
.driver = {
.name = "mtk-devapc",
.of_match_table = mtk_devapc_dt_match,
},
};
module_platform_driver(mtk_devapc_driver);
MODULE_DESCRIPTION("Mediatek Device APC Driver");
MODULE_AUTHOR("Neal Liu <neal.liu@mediatek.com>");
MODULE_LICENSE("GPL");