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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2011 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/smp.h>
#include <asm/smp_plat.h>
#include "common.h"
#include "hardware.h"
#define SRC_SCR 0x000
#define SRC_GPR1_V1 0x020
#define SRC_GPR1_V2 0x074
#define SRC_GPR1(gpr_v2) ((gpr_v2) ? SRC_GPR1_V2 : SRC_GPR1_V1)
#define BP_SRC_SCR_WARM_RESET_ENABLE 0
#define BP_SRC_SCR_SW_GPU_RST 1
#define BP_SRC_SCR_SW_VPU_RST 2
#define BP_SRC_SCR_SW_IPU1_RST 3
#define BP_SRC_SCR_SW_OPEN_VG_RST 4
#define BP_SRC_SCR_SW_IPU2_RST 12
#define BP_SRC_SCR_CORE1_RST 14
#define BP_SRC_SCR_CORE1_ENABLE 22
/* below is for i.MX7D */
#define SRC_A7RCR1 0x008
#define BP_SRC_A7RCR1_A7_CORE1_ENABLE 1
#define GPC_CPU_PGC_SW_PUP_REQ 0xf0
#define GPC_CPU_PGC_SW_PDN_REQ 0xfc
#define GPC_PGC_C1 0x840
#define BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7 0x2
static void __iomem *src_base;
static DEFINE_SPINLOCK(scr_lock);
static bool gpr_v2;
static void __iomem *gpc_base;
static const int sw_reset_bits[5] = {
BP_SRC_SCR_SW_GPU_RST,
BP_SRC_SCR_SW_VPU_RST,
BP_SRC_SCR_SW_IPU1_RST,
BP_SRC_SCR_SW_OPEN_VG_RST,
BP_SRC_SCR_SW_IPU2_RST
};
static int imx_src_reset_module(struct reset_controller_dev *rcdev,
unsigned long sw_reset_idx)
{
unsigned long timeout;
unsigned long flags;
int bit;
u32 val;
if (sw_reset_idx >= ARRAY_SIZE(sw_reset_bits))
return -EINVAL;
bit = 1 << sw_reset_bits[sw_reset_idx];
spin_lock_irqsave(&scr_lock, flags);
val = readl_relaxed(src_base + SRC_SCR);
val |= bit;
writel_relaxed(val, src_base + SRC_SCR);
spin_unlock_irqrestore(&scr_lock, flags);
timeout = jiffies + msecs_to_jiffies(1000);
while (readl(src_base + SRC_SCR) & bit) {
if (time_after(jiffies, timeout))
return -ETIME;
cpu_relax();
}
return 0;
}
static const struct reset_control_ops imx_src_ops = {
.reset = imx_src_reset_module,
};
static void imx_gpcv2_set_m_core_pgc(bool enable, u32 offset)
{
writel_relaxed(enable, gpc_base + offset);
}
/*
* The motivation for bringing up the second i.MX7D core inside the kernel
* is that legacy vendor bootloaders usually do not implement PSCI support.
* This is a significant blocker for systems in the field that are running old
* bootloader versions to upgrade to a modern mainline kernel version, as only
* one CPU of the i.MX7D would be brought up.
* Bring up the second i.MX7D core inside the kernel to make the migration
* path to mainline kernel easier for the existing iMX7D users.
*/
void imx_gpcv2_set_core1_pdn_pup_by_software(bool pdn)
{
u32 reg = pdn ? GPC_CPU_PGC_SW_PDN_REQ : GPC_CPU_PGC_SW_PUP_REQ;
u32 val, pup;
int ret;
imx_gpcv2_set_m_core_pgc(true, GPC_PGC_C1);
val = readl_relaxed(gpc_base + reg);
val |= BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7;
writel_relaxed(val, gpc_base + reg);
ret = readl_relaxed_poll_timeout_atomic(gpc_base + reg, pup,
!(pup & BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7),
5, 1000000);
if (ret < 0) {
pr_err("i.MX7D: CORE1_A7 power up timeout\n");
val &= ~BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7;
writel_relaxed(val, gpc_base + reg);
}
imx_gpcv2_set_m_core_pgc(false, GPC_PGC_C1);
}
void imx_enable_cpu(int cpu, bool enable)
{
u32 mask, val;
cpu = cpu_logical_map(cpu);
spin_lock(&scr_lock);
if (gpr_v2) {
if (enable)
imx_gpcv2_set_core1_pdn_pup_by_software(false);
mask = 1 << (BP_SRC_A7RCR1_A7_CORE1_ENABLE + cpu - 1);
val = readl_relaxed(src_base + SRC_A7RCR1);
val = enable ? val | mask : val & ~mask;
writel_relaxed(val, src_base + SRC_A7RCR1);
} else {
mask = 1 << (BP_SRC_SCR_CORE1_ENABLE + cpu - 1);
val = readl_relaxed(src_base + SRC_SCR);
val = enable ? val | mask : val & ~mask;
val |= 1 << (BP_SRC_SCR_CORE1_RST + cpu - 1);
writel_relaxed(val, src_base + SRC_SCR);
}
spin_unlock(&scr_lock);
}
void imx_set_cpu_jump(int cpu, void *jump_addr)
{
cpu = cpu_logical_map(cpu);
writel_relaxed(__pa_symbol(jump_addr),
src_base + SRC_GPR1(gpr_v2) + cpu * 8);
}
u32 imx_get_cpu_arg(int cpu)
{
cpu = cpu_logical_map(cpu);
return readl_relaxed(src_base + SRC_GPR1(gpr_v2) + cpu * 8 + 4);
}
void imx_set_cpu_arg(int cpu, u32 arg)
{
cpu = cpu_logical_map(cpu);
writel_relaxed(arg, src_base + SRC_GPR1(gpr_v2) + cpu * 8 + 4);
}
void __init imx_src_init(void)
{
struct device_node *np;
u32 val;
np = of_find_compatible_node(NULL, NULL, "fsl,imx51-src");
if (!np)
return;
src_base = of_iomap(np, 0);
WARN_ON(!src_base);
/*
* force warm reset sources to generate cold reset
* for a more reliable restart
*/
spin_lock(&scr_lock);
val = readl_relaxed(src_base + SRC_SCR);
val &= ~(1 << BP_SRC_SCR_WARM_RESET_ENABLE);
writel_relaxed(val, src_base + SRC_SCR);
spin_unlock(&scr_lock);
}
void __init imx7_src_init(void)
{
struct device_node *np;
gpr_v2 = true;
np = of_find_compatible_node(NULL, NULL, "fsl,imx7d-src");
if (!np)
return;
src_base = of_iomap(np, 0);
if (!src_base)
return;
np = of_find_compatible_node(NULL, NULL, "fsl,imx7d-gpc");
if (!np)
return;
gpc_base = of_iomap(np, 0);
if (!gpc_base)
return;
}
static const struct of_device_id imx_src_dt_ids[] = {
{ .compatible = "fsl,imx51-src" },
{ /* sentinel */ }
};
static int imx_src_probe(struct platform_device *pdev)
{
struct reset_controller_dev *rcdev;
rcdev = devm_kzalloc(&pdev->dev, sizeof(*rcdev), GFP_KERNEL);
if (!rcdev)
return -ENOMEM;
rcdev->ops = &imx_src_ops;
rcdev->dev = &pdev->dev;
rcdev->of_node = pdev->dev.of_node;
rcdev->nr_resets = ARRAY_SIZE(sw_reset_bits);
return devm_reset_controller_register(&pdev->dev, rcdev);
}
static struct platform_driver imx_src_driver = {
.driver = {
.name = "imx-src",
.of_match_table = imx_src_dt_ids,
},
.probe = imx_src_probe,
};
builtin_platform_driver(imx_src_driver);
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