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lib: irqchip/plic: Add priority save/restore helpers
These can be used by platform code to save the PLIC priority state, if it would otherwise be lost during non-retentive suspend. The platform is responsible for allocating all necessary storage. As a space optimization, store the saved priority values as 8-bit integers, since that is large enough to hold any priority value on the relevant platforms. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Samuel Holland <samuel@sholland.org>
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2 changed files with 24 additions and 0 deletions
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@ -17,6 +17,11 @@ struct plic_data {
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unsigned long num_src;
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};
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/* So far, priorities on all consumers of these functions fit in 8 bits. */
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void plic_priority_save(const struct plic_data *plic, u8 *priority);
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void plic_priority_restore(const struct plic_data *plic, const u8 *priority);
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void plic_context_save(const struct plic_data *plic, int context_id,
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u32 *enable, u32 *threshold);
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@ -22,6 +22,13 @@
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#define PLIC_CONTEXT_BASE 0x200000
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#define PLIC_CONTEXT_STRIDE 0x1000
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static u32 plic_get_priority(const struct plic_data *plic, u32 source)
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{
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volatile void *plic_priority = (char *)plic->addr +
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PLIC_PRIORITY_BASE + 4 * source;
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return readl(plic_priority);
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}
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static void plic_set_priority(const struct plic_data *plic, u32 source, u32 val)
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{
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volatile void *plic_priority = (char *)plic->addr +
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@ -29,6 +36,18 @@ static void plic_set_priority(const struct plic_data *plic, u32 source, u32 val)
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writel(val, plic_priority);
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}
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void plic_priority_save(const struct plic_data *plic, u8 *priority)
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{
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for (u32 i = 0; i < plic->num_src; i++)
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priority[i] = plic_get_priority(plic, i);
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}
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void plic_priority_restore(const struct plic_data *plic, const u8 *priority)
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{
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for (u32 i = 0; i < plic->num_src; i++)
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plic_set_priority(plic, i, priority[i]);
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}
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static u32 plic_get_thresh(const struct plic_data *plic, u32 cntxid)
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{
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volatile void *plic_thresh;
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