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lib: irqchip/plic: Add context save/restore helpers

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These can be used by platform code to save the PLIC context state, if
it would otherwise be lost during non-retentive suspend. The platform
is responsible for allocating all necessary storage.

Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Samuel Holland <samuel@sholland.org>
This commit is contained in:
Samuel Holland 2022-06-12 20:03:51 -05:00 • committed by Anup Patel
parent 8c362e7d06
commit 415ecf28f7
2 changed files with 54 additions and 3 deletions
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6
include/sbi_utils/irqchip/plic.h
View file

@ -17,6 +17,12 @@ struct plic_data {
unsigned long num_src;
};
void plic_context_save(const struct plic_data *plic, int context_id,
u32 *enable, u32 *threshold);
void plic_context_restore(const struct plic_data *plic, int context_id,
const u32 *enable, u32 threshold);
int plic_context_init(const struct plic_data *plic, int context_id,
bool enable, u32 threshold);

51
lib/utils/irqchip/plic.c
View file

@ -29,6 +29,16 @@ static void plic_set_priority(const struct plic_data *plic, u32 source, u32 val)
writel(val, plic_priority);
}
static u32 plic_get_thresh(const struct plic_data *plic, u32 cntxid)
{
volatile void *plic_thresh;
plic_thresh = (char *)plic->addr +
PLIC_CONTEXT_BASE + PLIC_CONTEXT_STRIDE * cntxid;
return readl(plic_thresh);
}
static void plic_set_thresh(const struct plic_data *plic, u32 cntxid, u32 val)
{
volatile void *plic_thresh;
@ -38,14 +48,49 @@ static void plic_set_thresh(const struct plic_data *plic, u32 cntxid, u32 val)
writel(val, plic_thresh);
}
static u32 plic_get_ie(const struct plic_data *plic, u32 cntxid,
u32 word_index)
{
volatile void *plic_ie;
plic_ie = (char *)plic->addr +
PLIC_ENABLE_BASE + PLIC_ENABLE_STRIDE * cntxid +
4 * word_index;
return readl(plic_ie);
}
static void plic_set_ie(const struct plic_data *plic, u32 cntxid,
u32 word_index, u32 val)
{
volatile char *plic_ie;
volatile void *plic_ie;
plic_ie = (char *)plic->addr +
PLIC_ENABLE_BASE + PLIC_ENABLE_STRIDE * cntxid;
writel(val, plic_ie + word_index * 4);
PLIC_ENABLE_BASE + PLIC_ENABLE_STRIDE * cntxid +
4 * word_index;
writel(val, plic_ie);
}
void plic_context_save(const struct plic_data *plic, int context_id,
u32 *enable, u32 *threshold)
{
u32 ie_words = (plic->num_src + 31) / 32;
for (u32 i = 0; i < ie_words; i++)
enable[i] = plic_get_ie(plic, context_id, i);
*threshold = plic_get_thresh(plic, context_id);
}
void plic_context_restore(const struct plic_data *plic, int context_id,
const u32 *enable, u32 threshold)
{
u32 ie_words = (plic->num_src + 31) / 32;
for (u32 i = 0; i < ie_words; i++)
plic_set_ie(plic, context_id, i, enable[i]);
plic_set_thresh(plic, context_id, threshold);
}
int plic_context_init(const struct plic_data *plic, int context_id,