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- /*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2019 Western Digital Corporation or its affiliates.
- *
- * Authors:
- * Anup Patel <anup.patel@wdc.com>
- * Samuel Holland <samuel@sholland.org>
- */
- #include <sbi/riscv_io.h>
- #include <sbi/riscv_encoding.h>
- #include <sbi/sbi_console.h>
- #include <sbi/sbi_error.h>
- #include <sbi/sbi_string.h>
- #include <sbi_utils/irqchip/plic.h>
- #define PLIC_PRIORITY_BASE 0x0
- #define PLIC_PENDING_BASE 0x1000
- #define PLIC_ENABLE_BASE 0x2000
- #define PLIC_ENABLE_STRIDE 0x80
- #define PLIC_CONTEXT_BASE 0x200000
- #define PLIC_CONTEXT_STRIDE 0x1000
- static u32 plic_get_priority(const struct plic_data *plic, u32 source)
- {
- volatile void *plic_priority = (char *)plic->addr +
- PLIC_PRIORITY_BASE + 4 * source;
- return readl(plic_priority);
- }
- static void plic_set_priority(const struct plic_data *plic, u32 source, u32 val)
- {
- volatile void *plic_priority = (char *)plic->addr +
- PLIC_PRIORITY_BASE + 4 * source;
- writel(val, plic_priority);
- }
- void plic_priority_save(const struct plic_data *plic, u8 *priority)
- {
- for (u32 i = 1; i <= plic->num_src; i++)
- priority[i] = plic_get_priority(plic, i);
- }
- void plic_priority_restore(const struct plic_data *plic, const u8 *priority)
- {
- for (u32 i = 1; i <= plic->num_src; i++)
- plic_set_priority(plic, i, priority[i]);
- }
- 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;
- plic_thresh = (char *)plic->addr +
- PLIC_CONTEXT_BASE + PLIC_CONTEXT_STRIDE * cntxid;
- 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 void *plic_ie;
- plic_ie = (char *)plic->addr +
- 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,
- bool enable, u32 threshold)
- {
- u32 ie_words, ie_value;
- if (!plic || context_id < 0)
- return SBI_EINVAL;
- ie_words = (plic->num_src + 31) / 32;
- ie_value = enable ? 0xffffffffU : 0U;
- for (u32 i = 0; i < ie_words; i++)
- plic_set_ie(plic, context_id, i, ie_value);
- plic_set_thresh(plic, context_id, threshold);
- return 0;
- }
- int plic_warm_irqchip_init(const struct plic_data *plic,
- int m_cntx_id, int s_cntx_id)
- {
- int ret;
- /* By default, disable all IRQs for M-mode of target HART */
- if (m_cntx_id > -1) {
- ret = plic_context_init(plic, m_cntx_id, false, 0x7);
- if (ret)
- return ret;
- }
- /* By default, disable all IRQs for S-mode of target HART */
- if (s_cntx_id > -1) {
- ret = plic_context_init(plic, s_cntx_id, false, 0x7);
- if (ret)
- return ret;
- }
- return 0;
- }
- int plic_cold_irqchip_init(const struct plic_data *plic)
- {
- int i;
- if (!plic)
- return SBI_EINVAL;
- /* Configure default priorities of all IRQs */
- for (i = 1; i <= plic->num_src; i++)
- plic_set_priority(plic, i, 0);
- return 0;
- }
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