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// SPDX-License-Identifier: GPL-2.0 OR MIT
/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/device.h>
#include "lima_device.h"
#include "lima_mmu.h"
#include "lima_vm.h"
#include "lima_regs.h"
#define mmu_write(reg, data) writel(data, ip->iomem + reg)
#define mmu_read(reg) readl(ip->iomem + reg)
#define lima_mmu_send_command(cmd, addr, val, cond) \
({ \
int __ret; \
\
mmu_write(LIMA_MMU_COMMAND, cmd); \
__ret = readl_poll_timeout(ip->iomem + (addr), val, \
cond, 0, 100); \
if (__ret) \
dev_err(dev->dev, \
"mmu command %x timeout\n", cmd); \
__ret; \
})
static irqreturn_t lima_mmu_irq_handler(int irq, void *data)
{
struct lima_ip *ip = data;
struct lima_device *dev = ip->dev;
u32 status = mmu_read(LIMA_MMU_INT_STATUS);
struct lima_sched_pipe *pipe;
/* for shared irq case */
if (!status)
return IRQ_NONE;
if (status & LIMA_MMU_INT_PAGE_FAULT) {
u32 fault = mmu_read(LIMA_MMU_PAGE_FAULT_ADDR);
dev_err(dev->dev, "mmu page fault at 0x%x from bus id %d of type %s on %s\n",
fault, LIMA_MMU_STATUS_BUS_ID(status),
status & LIMA_MMU_STATUS_PAGE_FAULT_IS_WRITE ? "write" : "read",
lima_ip_name(ip));
}
if (status & LIMA_MMU_INT_READ_BUS_ERROR)
dev_err(dev->dev, "mmu %s irq bus error\n", lima_ip_name(ip));
/* mask all interrupts before resume */
mmu_write(LIMA_MMU_INT_MASK, 0);
mmu_write(LIMA_MMU_INT_CLEAR, status);
pipe = dev->pipe + (ip->id == lima_ip_gpmmu ? lima_pipe_gp : lima_pipe_pp);
lima_sched_pipe_mmu_error(pipe);
return IRQ_HANDLED;
}
int lima_mmu_init(struct lima_ip *ip)
{
struct lima_device *dev = ip->dev;
int err;
u32 v;
if (ip->id == lima_ip_ppmmu_bcast)
return 0;
mmu_write(LIMA_MMU_DTE_ADDR, 0xCAFEBABE);
if (mmu_read(LIMA_MMU_DTE_ADDR) != 0xCAFEB000) {
dev_err(dev->dev, "mmu %s dte write test fail\n", lima_ip_name(ip));
return -EIO;
}
mmu_write(LIMA_MMU_COMMAND, LIMA_MMU_COMMAND_HARD_RESET);
err = lima_mmu_send_command(LIMA_MMU_COMMAND_HARD_RESET,
LIMA_MMU_DTE_ADDR, v, v == 0);
if (err)
return err;
err = devm_request_irq(dev->dev, ip->irq, lima_mmu_irq_handler,
IRQF_SHARED, lima_ip_name(ip), ip);
if (err) {
dev_err(dev->dev, "mmu %s fail to request irq\n", lima_ip_name(ip));
return err;
}
mmu_write(LIMA_MMU_INT_MASK, LIMA_MMU_INT_PAGE_FAULT | LIMA_MMU_INT_READ_BUS_ERROR);
mmu_write(LIMA_MMU_DTE_ADDR, dev->empty_vm->pd.dma);
return lima_mmu_send_command(LIMA_MMU_COMMAND_ENABLE_PAGING,
LIMA_MMU_STATUS, v,
v & LIMA_MMU_STATUS_PAGING_ENABLED);
}
void lima_mmu_fini(struct lima_ip *ip)
{
}
void lima_mmu_flush_tlb(struct lima_ip *ip)
{
mmu_write(LIMA_MMU_COMMAND, LIMA_MMU_COMMAND_ZAP_CACHE);
}
void lima_mmu_switch_vm(struct lima_ip *ip, struct lima_vm *vm)
{
struct lima_device *dev = ip->dev;
u32 v;
lima_mmu_send_command(LIMA_MMU_COMMAND_ENABLE_STALL,
LIMA_MMU_STATUS, v,
v & LIMA_MMU_STATUS_STALL_ACTIVE);
if (vm)
mmu_write(LIMA_MMU_DTE_ADDR, vm->pd.dma);
/* flush the TLB */
mmu_write(LIMA_MMU_COMMAND, LIMA_MMU_COMMAND_ZAP_CACHE);
lima_mmu_send_command(LIMA_MMU_COMMAND_DISABLE_STALL,
LIMA_MMU_STATUS, v,
!(v & LIMA_MMU_STATUS_STALL_ACTIVE));
}
void lima_mmu_page_fault_resume(struct lima_ip *ip)
{
struct lima_device *dev = ip->dev;
u32 status = mmu_read(LIMA_MMU_STATUS);
u32 v;
if (status & LIMA_MMU_STATUS_PAGE_FAULT_ACTIVE) {
dev_info(dev->dev, "mmu resume\n");
mmu_write(LIMA_MMU_INT_MASK, 0);
mmu_write(LIMA_MMU_DTE_ADDR, 0xCAFEBABE);
lima_mmu_send_command(LIMA_MMU_COMMAND_HARD_RESET,
LIMA_MMU_DTE_ADDR, v, v == 0);
mmu_write(LIMA_MMU_INT_MASK, LIMA_MMU_INT_PAGE_FAULT | LIMA_MMU_INT_READ_BUS_ERROR);
mmu_write(LIMA_MMU_DTE_ADDR, dev->empty_vm->pd.dma);
lima_mmu_send_command(LIMA_MMU_COMMAND_ENABLE_PAGING,
LIMA_MMU_STATUS, v,
v & LIMA_MMU_STATUS_PAGING_ENABLED);
}
}
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