/*
* The actual error handling takes longer than is ideal so this must be
* threaded.
*/
static irqreturn_t tegra_mc_error_hard_irq(int irq, void *data)
{
u32 intr;
err_channel = 0;
intr = mc_readl(MC_INT_STATUS);
/*
* Sometimes the MC seems to generate spurious interrupts - that
* is interrupts with an interrupt status register equal to 0.
* Not much we can do other than keep a count of them.
*/
if (!intr) {
spurious_intrs++;
return IRQ_NONE;
}
trace_printk("MCERR detected.\n");
/*
* We have an interrupt; disable the rest until this one is handled.
* This means we will potentially miss interrupts. We can live with
* that.
*/
mc_writel(0, MC_INT_MASK);
mc_readl(MC_INT_STATUS);
mc_intr = intr & mc_int_mask;
return IRQ_WAKE_THREAD;
}
static void tegra30_mc_decode(struct tegra30_mc *mc, int n)
{
u32 err, addr;
const char * const mc_int_err[] = {
"MC_DECERR",
"Unknown",
"MC_SECURITY_ERR",
"MC_ARBITRATION_EMEM",
"MC_SMMU_ERR",
};
const char * const err_type[] = {
"Unknown",
"Unknown",
"DECERR_EMEM",
"SECURITY_TRUSTZONE",
"SECURITY_CARVEOUT",
"Unknown",
"INVALID_SMMU_PAGE",
"Unknown",
};
char attr[6];
int cid, perm, type, idx;
const char *client = "Unknown";
idx = n - MC_INT_ERR_SHIFT;
if ((idx < 0) || (idx >= ARRAY_SIZE(mc_int_err)) || (idx == 1)) {
dev_err_ratelimited(mc->dev, "Unknown interrupt status %08lx\n",
BIT(n));
return;
}
err = mc_readl(mc, MC_ERR_STATUS);
type = (err & MC_ERR_TYPE_MASK) >> MC_ERR_TYPE_SHIFT;
perm = (err & MC_ERR_INVALID_SMMU_PAGE_MASK) >>
MC_ERR_INVALID_SMMU_PAGE_SHIFT;
if (type == MC_ERR_TYPE_INVALID_SMMU_PAGE)
sprintf(attr, "%c-%c-%c",
(perm & BIT(2)) ? 'R' : '-',
(perm & BIT(1)) ? 'W' : '-',
(perm & BIT(0)) ? 'S' : '-');
else
attr[0] = '\0';
cid = err & MC_CLIENT_ID_MASK;
if (cid < ARRAY_SIZE(tegra30_mc_client))
client = tegra30_mc_client[cid];
addr = mc_readl(mc, MC_ERR_ADR);
dev_err_ratelimited(mc->dev, "%s (0x%08x): 0x%08x %s (%s %s %s %s)\n",
mc_int_err[idx], err, addr, client,
(err & MC_ERR_SECURITY) ? "secure" : "non-secure",
(err & MC_ERR_RW) ? "write" : "read",
err_type[type], attr);
}
static irqreturn_t tegra30_mc_isr(int irq, void *data)
{
u32 stat, mask, bit;
struct tegra30_mc *mc = data;
stat = mc_readl(mc, MC_INTSTATUS);
mask = mc_readl(mc, MC_INTMASK);
mask &= stat;
if (!mask)
return IRQ_NONE;
while ((bit = ffs(mask)) != 0)
tegra30_mc_decode(mc, bit - 1);
mc_writel(mc, stat, MC_INTSTATUS);
return IRQ_HANDLED;
}
static int tegra30_mc_suspend(struct device *dev)
{
int i;
struct tegra30_mc *mc = dev_get_drvdata(dev);
for (i = 0; i < ARRAY_SIZE(tegra30_mc_ctx); i++)
mc->ctx[i] = mc_readl(mc, tegra30_mc_ctx[i]);
return 0;
}
unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc)
{
u8 dram_count;
dram_count = mc_readl(mc, MC_EMEM_ADR_CFG);
dram_count &= MC_EMEM_ADR_CFG_EMEM_NUMDEV;
dram_count++;
return dram_count;
}
static inline void set_mc_arbiter_limits(void)
{
u32 reg = mc_readl(MC_EMEM_ARB_OUTSTANDING_REQ);
u32 max_val = 0x50 << EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT;
if (!(reg & MC_EMEM_ARB_OUTSTANDING_REQ_HOLDOFF_OVERRIDE) ||
((reg & MC_EMEM_ARB_OUTSTANDING_REQ_MAX_MASK) > max_val)) {
reg = MC_EMEM_ARB_OUTSTANDING_REQ_LIMIT_ENABLE |
MC_EMEM_ARB_OUTSTANDING_REQ_HOLDOFF_OVERRIDE | max_val;
mc_writel(reg, MC_EMEM_ARB_OUTSTANDING_REQ);
mc_writel(0x1, MC_TIMING_CONTROL);
}
}
static int tegra30_mc_resume(struct device *dev)
{
int i;
struct tegra30_mc *mc = dev_get_drvdata(dev);
for (i = 0; i < ARRAY_SIZE(tegra30_mc_ctx); i++)
mc_writel(mc, mc->ctx[i], tegra30_mc_ctx[i]);
mc_writel(mc, 1, MC_TIMING_CONTROL);
/* Read-back to ensure that write reached */
mc_readl(mc, MC_TIMING_CONTROL);
return 0;
}
static inline void do_clock_change(u32 clk_setting)
{
int err;
mc_readl(MC_EMEM_ADR_CFG); /* completes prev writes */
writel(clk_setting, clk_base + emc->reg);
readl(clk_base + emc->reg);/* completes prev write */
err = wait_for_update(EMC_INTSTATUS,
EMC_INTSTATUS_CLKCHANGE_COMPLETE, true);
if (err) {
pr_err("%s: clock change completion error: %d", __func__, err);
BUG();
}
}
/*
* Common MC error handling code.
*/
static irqreturn_t tegra_mc_error_thread(int irq, void *data)
{
struct mc_client *client = NULL;
const struct mc_error *fault;
const char *smmu_info;
unsigned long count;
phys_addr_t addr;
u32 status, intr = mc_intr;
u32 write, secure;
u32 client_id;
cancel_delayed_work(&unthrottle_prints_work);
if (intr & MC_INT_ARBITRATION_EMEM) {
arb_intr();
if (intr == MC_INT_ARBITRATION_EMEM)
goto out;
intr &= ~MC_INT_ARBITRATION_EMEM;
}
count = atomic_inc_return(&error_count);
fault = chip_specific.mcerr_info(intr & mc_int_mask);
if (WARN(!fault, "Unknown error! intr sig: 0x%08x\n",
intr & mc_int_mask))
goto out;
if (fault->flags & E_NO_STATUS) {
mcerr_pr("MC fault - no status: %s\n", fault->msg);
goto out;
}
status = __mc_readl(err_channel, fault->stat_reg);
addr = __mc_readl(err_channel, fault->addr_reg);
secure = !!(status & MC_ERR_STATUS_SECURE);
write = !!(status & MC_ERR_STATUS_WRITE);
client_id = status & 0xff;
client = &mc_clients[client_id <= mc_client_last
? client_id : mc_client_last];
/*
* LPAE: make sure we get the extra 2 physical address bits available
* and pass them down to the printing function.
*/
addr |= (((phys_addr_t)(status & MC_ERR_STATUS_ADR_HI)) << 12);
if (fault->flags & E_SMMU)
smmu_info = smmu_page_attrib[MC_ERR_SMMU_BITS(status)];
else
smmu_info = NULL;
mcerr_info_update(client, intr & mc_int_mask);
if (mcerr_throttle_enabled && count >= MAX_PRINTS) {
schedule_delayed_work(&unthrottle_prints_work, HZ/2);
if (count == MAX_PRINTS)
mcerr_pr("Too many MC errors; throttling prints\n");
goto out;
}
chip_specific.mcerr_print(fault, client, status, addr, secure, write,
smmu_info);
out:
mc_writel(intr, MC_INT_STATUS);
mc_readl(MC_INT_MASK);
mc_writel(mc_int_mask, MC_INT_MASK);
return IRQ_HANDLED;
}
