[PATCH 12/13] lib: utils/irqchip: Add FDT based driver for APLIC
Anup Patel
apatel at ventanamicro.com
Tue Jan 4 02:13:22 PST 2022
We add simple FDT irqchip driver for APLIC so that generic platform (and
other FDT based platforms) can utilize common APLIC initialization library.
Signed-off-by: Anup Patel <anup.patel at wdc.com>
Signed-off-by: Anup Patel <apatel at ventanamicro.com>
---
include/sbi_utils/fdt/fdt_helper.h | 4 +
lib/utils/fdt/fdt_helper.c | 159 ++++++++++++++++++++++++++
lib/utils/irqchip/fdt_irqchip.c | 2 +
lib/utils/irqchip/fdt_irqchip_aplic.c | 56 +++++++++
lib/utils/irqchip/objects.mk | 1 +
5 files changed, 222 insertions(+)
create mode 100644 lib/utils/irqchip/fdt_irqchip_aplic.c
diff --git a/include/sbi_utils/fdt/fdt_helper.h b/include/sbi_utils/fdt/fdt_helper.h
index 4c8d29e..1232b26 100644
--- a/include/sbi_utils/fdt/fdt_helper.h
+++ b/include/sbi_utils/fdt/fdt_helper.h
@@ -68,6 +68,10 @@ int fdt_parse_uart8250_node(void *fdt, int nodeoffset,
int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
const char *compatible);
+struct aplic_data;
+
+int fdt_parse_aplic_node(void *fdt, int nodeoff, struct aplic_data *aplic);
+
struct imsic_data;
bool fdt_check_imsic_mlevel(void *fdt);
diff --git a/lib/utils/fdt/fdt_helper.c b/lib/utils/fdt/fdt_helper.c
index e2782b6..2f5ebc8 100644
--- a/lib/utils/fdt/fdt_helper.c
+++ b/lib/utils/fdt/fdt_helper.c
@@ -13,6 +13,7 @@
#include <sbi/sbi_platform.h>
#include <sbi/sbi_scratch.h>
#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/irqchip/aplic.h>
#include <sbi_utils/irqchip/imsic.h>
#include <sbi_utils/irqchip/plic.h>
@@ -466,6 +467,164 @@ int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
return fdt_parse_uart8250_node(fdt, nodeoffset, uart);
}
+int fdt_parse_aplic_node(void *fdt, int nodeoff, struct aplic_data *aplic)
+{
+ bool child_found;
+ const fdt32_t *val;
+ const fdt32_t *del;
+ struct imsic_data imsic;
+ int i, j, d, dcnt, len, noff, rc;
+ uint64_t reg_addr, reg_size;
+ struct aplic_delegate_data *deleg;
+
+ if (nodeoff < 0 || !aplic || !fdt)
+ return SBI_ENODEV;
+ memset(aplic, 0, sizeof(*aplic));
+
+ rc = fdt_get_node_addr_size(fdt, nodeoff, 0, ®_addr, ®_size);
+ if (rc < 0 || !reg_addr || !reg_size)
+ return SBI_ENODEV;
+ aplic->addr = reg_addr;
+ aplic->size = reg_size;
+
+ val = fdt_getprop(fdt, nodeoff, "riscv,num-sources", &len);
+ if (len > 0)
+ aplic->num_source = fdt32_to_cpu(*val);
+
+ val = fdt_getprop(fdt, nodeoff, "interrupts-extended", &len);
+ if (val && len > sizeof(fdt32_t)) {
+ len = len / sizeof(fdt32_t);
+ for (i = 0; i < len; i += 2) {
+ if (fdt32_to_cpu(val[i + 1]) == IRQ_M_EXT) {
+ aplic->targets_mmode = true;
+ break;
+ }
+ }
+ aplic->num_idc = len / 2;
+ goto aplic_msi_parent_done;
+ }
+
+ val = fdt_getprop(fdt, nodeoff, "msi-parent", &len);
+ if (val && len >= sizeof(fdt32_t)) {
+ noff = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*val));
+ if (noff < 0)
+ return noff;
+
+ rc = fdt_parse_imsic_node(fdt, noff, &imsic);
+ if (rc)
+ return rc;
+
+ rc = imsic_data_check(&imsic);
+ if (rc)
+ return rc;
+
+ aplic->targets_mmode = imsic.targets_mmode;
+
+ if (imsic.targets_mmode) {
+ aplic->has_msicfg_mmode = true;
+ aplic->msicfg_mmode.lhxs = imsic.guest_index_bits;
+ aplic->msicfg_mmode.lhxw = imsic.hart_index_bits;
+ aplic->msicfg_mmode.hhxw = imsic.group_index_bits;
+ aplic->msicfg_mmode.hhxs = imsic.group_index_shift;
+ if (aplic->msicfg_mmode.hhxs <
+ (2 * IMSIC_MMIO_PAGE_SHIFT))
+ return SBI_EINVAL;
+ aplic->msicfg_mmode.hhxs -= 24;
+ aplic->msicfg_mmode.base_addr = imsic.regs[0].addr;
+ } else {
+ goto aplic_msi_parent_done;
+ }
+
+ val = fdt_getprop(fdt, nodeoff, "riscv,children", &len);
+ if (!val || len < sizeof(fdt32_t))
+ goto aplic_msi_parent_done;
+
+ noff = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*val));
+ if (noff < 0)
+ return noff;
+
+ val = fdt_getprop(fdt, noff, "msi-parent", &len);
+ if (!val || len < sizeof(fdt32_t))
+ goto aplic_msi_parent_done;
+
+ noff = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*val));
+ if (noff < 0)
+ return noff;
+
+ rc = fdt_parse_imsic_node(fdt, noff, &imsic);
+ if (rc)
+ return rc;
+
+ rc = imsic_data_check(&imsic);
+ if (rc)
+ return rc;
+
+ if (!imsic.targets_mmode) {
+ aplic->has_msicfg_smode = true;
+ aplic->msicfg_smode.lhxs = imsic.guest_index_bits;
+ aplic->msicfg_smode.lhxw = imsic.hart_index_bits;
+ aplic->msicfg_smode.hhxw = imsic.group_index_bits;
+ aplic->msicfg_smode.hhxs = imsic.group_index_shift;
+ if (aplic->msicfg_smode.hhxs <
+ (2 * IMSIC_MMIO_PAGE_SHIFT))
+ return SBI_EINVAL;
+ aplic->msicfg_smode.hhxs -= 24;
+ aplic->msicfg_smode.base_addr = imsic.regs[0].addr;
+ }
+ }
+aplic_msi_parent_done:
+
+ for (d = 0; d < APLIC_MAX_DELEGATE; d++) {
+ deleg = &aplic->delegate[d];
+ deleg->first_irq = 0;
+ deleg->last_irq = 0;
+ deleg->child_index = 0;
+ }
+
+ del = fdt_getprop(fdt, nodeoff, "riscv,delegate", &len);
+ if (!del || len < (3 * sizeof(fdt32_t)))
+ goto skip_delegate_parse;
+ d = 0;
+ dcnt = len / sizeof(fdt32_t);
+ for (i = 0; i < dcnt; i += 3) {
+ if (d >= APLIC_MAX_DELEGATE)
+ break;
+ deleg = &aplic->delegate[d];
+
+ deleg->first_irq = fdt32_to_cpu(del[i + 1]);
+ deleg->last_irq = fdt32_to_cpu(del[i + 2]);
+ deleg->child_index = 0;
+
+ child_found = false;
+ val = fdt_getprop(fdt, nodeoff, "riscv,children", &len);
+ if (!val || len < sizeof(fdt32_t)) {
+ deleg->first_irq = 0;
+ deleg->last_irq = 0;
+ deleg->child_index = 0;
+ continue;
+ }
+ len = len / sizeof(fdt32_t);
+ for (j = 0; j < len; j++) {
+ if (del[i] != val[j])
+ continue;
+ deleg->child_index = j;
+ child_found = true;
+ break;
+ }
+
+ if (child_found) {
+ d++;
+ } else {
+ deleg->first_irq = 0;
+ deleg->last_irq = 0;
+ deleg->child_index = 0;
+ }
+ }
+skip_delegate_parse:
+
+ return 0;
+}
+
bool fdt_check_imsic_mlevel(void *fdt)
{
const fdt32_t *val;
diff --git a/lib/utils/irqchip/fdt_irqchip.c b/lib/utils/irqchip/fdt_irqchip.c
index cf64a2e..6007755 100644
--- a/lib/utils/irqchip/fdt_irqchip.c
+++ b/lib/utils/irqchip/fdt_irqchip.c
@@ -12,10 +12,12 @@
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/irqchip/fdt_irqchip.h>
+extern struct fdt_irqchip fdt_irqchip_aplic;
extern struct fdt_irqchip fdt_irqchip_imsic;
extern struct fdt_irqchip fdt_irqchip_plic;
static struct fdt_irqchip *irqchip_drivers[] = {
+ &fdt_irqchip_aplic,
&fdt_irqchip_imsic,
&fdt_irqchip_plic
};
diff --git a/lib/utils/irqchip/fdt_irqchip_aplic.c b/lib/utils/irqchip/fdt_irqchip_aplic.c
new file mode 100644
index 0000000..965f023
--- /dev/null
+++ b/lib/utils/irqchip/fdt_irqchip_aplic.c
@@ -0,0 +1,56 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2021 Western Digital Corporation or its affiliates.
+ * Copyright (c) 2022 Ventana Micro Systems Inc.
+ *
+ * Authors:
+ * Anup Patel <anup.patel at wdc.com>
+ */
+
+#include <libfdt.h>
+#include <sbi/riscv_asm.h>
+#include <sbi/sbi_error.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/irqchip/fdt_irqchip.h>
+#include <sbi_utils/irqchip/aplic.h>
+
+#define APLIC_MAX_NR 16
+
+static unsigned long aplic_count = 0;
+static struct aplic_data aplic[APLIC_MAX_NR];
+
+static int irqchip_aplic_warm_init(void)
+{
+ /* Nothing to do here. */
+ return 0;
+}
+
+static int irqchip_aplic_cold_init(void *fdt, int nodeoff,
+ const struct fdt_match *match)
+{
+ int rc;
+ struct aplic_data *pd;
+
+ if (APLIC_MAX_NR <= aplic_count)
+ return SBI_ENOSPC;
+ pd = &aplic[aplic_count++];
+
+ rc = fdt_parse_aplic_node(fdt, nodeoff, pd);
+ if (rc)
+ return rc;
+
+ return aplic_cold_irqchip_init(pd);
+}
+
+static const struct fdt_match irqchip_aplic_match[] = {
+ { .compatible = "riscv,aplic" },
+ { },
+};
+
+struct fdt_irqchip fdt_irqchip_aplic = {
+ .match_table = irqchip_aplic_match,
+ .cold_init = irqchip_aplic_cold_init,
+ .warm_init = irqchip_aplic_warm_init,
+ .exit = NULL,
+};
diff --git a/lib/utils/irqchip/objects.mk b/lib/utils/irqchip/objects.mk
index b2b3f79..fad4344 100644
--- a/lib/utils/irqchip/objects.mk
+++ b/lib/utils/irqchip/objects.mk
@@ -8,6 +8,7 @@
#
libsbiutils-objs-y += irqchip/fdt_irqchip.o
+libsbiutils-objs-y += irqchip/fdt_irqchip_aplic.o
libsbiutils-objs-y += irqchip/fdt_irqchip_imsic.o
libsbiutils-objs-y += irqchip/fdt_irqchip_plic.o
libsbiutils-objs-y += irqchip/aplic.o
--
2.25.1
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