[PATCH 09/13] lib: utils/irqchip: Add FDT based driver for IMSIC
Anup Patel
apatel at ventanamicro.com
Tue Jan 4 02:13:19 PST 2022
We add simple FDT irqchip driver for IMSIC so that generic platform
(and other FDT based platforms) can utilize common IMIC 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 | 6 ++
lib/utils/fdt/fdt_helper.c | 103 +++++++++++++++++++++++++
lib/utils/irqchip/fdt_irqchip.c | 2 +
lib/utils/irqchip/fdt_irqchip_imsic.c | 106 ++++++++++++++++++++++++++
lib/utils/irqchip/objects.mk | 1 +
platform/generic/platform.c | 12 +++
6 files changed, 230 insertions(+)
create mode 100644 lib/utils/irqchip/fdt_irqchip_imsic.c
diff --git a/include/sbi_utils/fdt/fdt_helper.h b/include/sbi_utils/fdt/fdt_helper.h
index 24fee7a..4c8d29e 100644
--- a/include/sbi_utils/fdt/fdt_helper.h
+++ b/include/sbi_utils/fdt/fdt_helper.h
@@ -68,6 +68,12 @@ int fdt_parse_uart8250_node(void *fdt, int nodeoffset,
int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
const char *compatible);
+struct imsic_data;
+
+bool fdt_check_imsic_mlevel(void *fdt);
+
+int fdt_parse_imsic_node(void *fdt, int nodeoff, struct imsic_data *imsic);
+
struct plic_data;
int fdt_parse_plic_node(void *fdt, int nodeoffset, struct plic_data *plic);
diff --git a/lib/utils/fdt/fdt_helper.c b/lib/utils/fdt/fdt_helper.c
index 5bf4021..e2782b6 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/imsic.h>
#include <sbi_utils/irqchip/plic.h>
#define DEFAULT_UART_FREQ 0
@@ -465,6 +466,108 @@ int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
return fdt_parse_uart8250_node(fdt, nodeoffset, uart);
}
+bool fdt_check_imsic_mlevel(void *fdt)
+{
+ const fdt32_t *val;
+ int i, len, noff = 0;
+
+ if (!fdt)
+ return false;
+
+ while ((noff = fdt_node_offset_by_compatible(fdt, noff,
+ "riscv,imsics")) >= 0) {
+ val = fdt_getprop(fdt, noff, "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)
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
+int fdt_parse_imsic_node(void *fdt, int nodeoff, struct imsic_data *imsic)
+{
+ const fdt32_t *val;
+ struct imsic_regs *regs;
+ uint64_t reg_addr, reg_size;
+ int i, rc, len, nr_parent_irqs;
+
+ if (nodeoff < 0 || !imsic || !fdt)
+ return SBI_ENODEV;
+
+ imsic->targets_mmode = false;
+ val = fdt_getprop(fdt, nodeoff, "interrupts-extended", &len);
+ if (val && len > sizeof(fdt32_t)) {
+ len = len / sizeof(fdt32_t);
+ nr_parent_irqs = len / 2;
+ for (i = 0; i < len; i += 2) {
+ if (fdt32_to_cpu(val[i + 1]) == IRQ_M_EXT) {
+ imsic->targets_mmode = true;
+ break;
+ }
+ }
+ } else
+ return SBI_EINVAL;
+
+ val = fdt_getprop(fdt, nodeoff, "riscv,guest-index-bits", &len);
+ if (val && len > 0)
+ imsic->guest_index_bits = fdt32_to_cpu(*val);
+ else
+ imsic->guest_index_bits = 0;
+
+ val = fdt_getprop(fdt, nodeoff, "riscv,hart-index-bits", &len);
+ if (val && len > 0) {
+ imsic->hart_index_bits = fdt32_to_cpu(*val);
+ } else {
+ imsic->hart_index_bits = __fls(nr_parent_irqs);
+ if ((1UL << imsic->hart_index_bits) < nr_parent_irqs)
+ imsic->hart_index_bits++;
+ }
+
+ val = fdt_getprop(fdt, nodeoff, "riscv,group-index-bits", &len);
+ if (val && len > 0)
+ imsic->group_index_bits = fdt32_to_cpu(*val);
+ else
+ imsic->group_index_bits = 0;
+
+ val = fdt_getprop(fdt, nodeoff, "riscv,group-index-shift", &len);
+ if (val && len > 0)
+ imsic->group_index_shift = fdt32_to_cpu(*val);
+ else
+ imsic->group_index_shift = 2 * IMSIC_MMIO_PAGE_SHIFT;
+
+ val = fdt_getprop(fdt, nodeoff, "riscv,num-ids", &len);
+ if (val && len > 0)
+ imsic->num_ids = fdt32_to_cpu(*val);
+ else
+ return SBI_EINVAL;
+
+ for (i = 0; i < IMSIC_MAX_REGS; i++) {
+ regs = &imsic->regs[i];
+ regs->addr = 0;
+ regs->size = 0;
+ }
+
+ for (i = 0; i < (IMSIC_MAX_REGS - 1); i++) {
+ regs = &imsic->regs[i];
+
+ rc = fdt_get_node_addr_size(fdt, nodeoff, i,
+ ®_addr, ®_size);
+ if (rc < 0 || !reg_addr || !reg_size)
+ break;
+ regs->addr = reg_addr;
+ regs->size = reg_size;
+ };
+ if (!imsic->regs[0].size)
+ return SBI_EINVAL;
+
+ return 0;
+}
+
int fdt_parse_plic_node(void *fdt, int nodeoffset, struct plic_data *plic)
{
int len, rc;
diff --git a/lib/utils/irqchip/fdt_irqchip.c b/lib/utils/irqchip/fdt_irqchip.c
index bf6969a..cf64a2e 100644
--- a/lib/utils/irqchip/fdt_irqchip.c
+++ b/lib/utils/irqchip/fdt_irqchip.c
@@ -12,9 +12,11 @@
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/irqchip/fdt_irqchip.h>
+extern struct fdt_irqchip fdt_irqchip_imsic;
extern struct fdt_irqchip fdt_irqchip_plic;
static struct fdt_irqchip *irqchip_drivers[] = {
+ &fdt_irqchip_imsic,
&fdt_irqchip_plic
};
diff --git a/lib/utils/irqchip/fdt_irqchip_imsic.c b/lib/utils/irqchip/fdt_irqchip_imsic.c
new file mode 100644
index 0000000..b6962be
--- /dev/null
+++ b/lib/utils/irqchip/fdt_irqchip_imsic.c
@@ -0,0 +1,106 @@
+/*
+ * 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/sbi_hartmask.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/irqchip/fdt_irqchip.h>
+#include <sbi_utils/irqchip/imsic.h>
+
+#define IMSIC_MAX_NR 16
+
+static unsigned long imsic_count = 0;
+static struct imsic_data imsic[IMSIC_MAX_NR];
+
+static int irqchip_imsic_update_hartid_table(void *fdt, int nodeoff,
+ struct imsic_data *id)
+{
+ const fdt32_t *val;
+ u32 phandle, hwirq, hartid;
+ int i, err, count, cpu_offset, cpu_intc_offset;
+
+ val = fdt_getprop(fdt, nodeoff, "interrupts-extended", &count);
+ if (!val || count < sizeof(fdt32_t))
+ return SBI_EINVAL;
+ count = count / sizeof(fdt32_t);
+
+ for (i = 0; i < count; i += 2) {
+ phandle = fdt32_to_cpu(val[i]);
+ hwirq = fdt32_to_cpu(val[i + 1]);
+
+ cpu_intc_offset = fdt_node_offset_by_phandle(fdt, phandle);
+ if (cpu_intc_offset < 0)
+ continue;
+
+ cpu_offset = fdt_parent_offset(fdt, cpu_intc_offset);
+ if (cpu_intc_offset < 0)
+ continue;
+
+ err = fdt_parse_hart_id(fdt, cpu_offset, &hartid);
+ if (err)
+ return SBI_EINVAL;
+ if (SBI_HARTMASK_MAX_BITS <= hartid)
+ return SBI_EINVAL;
+
+ switch (hwirq) {
+ case IRQ_M_EXT:
+ err = imsic_map_hartid_to_data(hartid, id, i / 2);
+ if (err)
+ return err;
+ break;
+ default:
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int irqchip_imsic_cold_init(void *fdt, int nodeoff,
+ const struct fdt_match *match)
+{
+ int rc;
+ struct imsic_data *id;
+
+ if (IMSIC_MAX_NR <= imsic_count)
+ return SBI_ENOSPC;
+ id = &imsic[imsic_count];
+
+ rc = fdt_parse_imsic_node(fdt, nodeoff, id);
+ if (rc)
+ return rc;
+ if (!id->targets_mmode)
+ return 0;
+
+ rc = irqchip_imsic_update_hartid_table(fdt, nodeoff, id);
+ if (rc)
+ return rc;
+
+ rc = imsic_cold_irqchip_init(id);
+ if (rc)
+ return rc;
+
+ imsic_count++;
+
+ return 0;
+}
+
+static const struct fdt_match irqchip_imsic_match[] = {
+ { .compatible = "riscv,imsics" },
+ { },
+};
+
+struct fdt_irqchip fdt_irqchip_imsic = {
+ .match_table = irqchip_imsic_match,
+ .cold_init = irqchip_imsic_cold_init,
+ .warm_init = imsic_warm_irqchip_init,
+};
diff --git a/lib/utils/irqchip/objects.mk b/lib/utils/irqchip/objects.mk
index 76a3c94..ae6f255 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_imsic.o
libsbiutils-objs-y += irqchip/fdt_irqchip_plic.o
libsbiutils-objs-y += irqchip/imsic.o
libsbiutils-objs-y += irqchip/plic.o
diff --git a/platform/generic/platform.c b/platform/generic/platform.c
index bc6e761..8a4fb70 100644
--- a/platform/generic/platform.c
+++ b/platform/generic/platform.c
@@ -18,6 +18,7 @@
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/fdt/fdt_pmu.h>
#include <sbi_utils/irqchip/fdt_irqchip.h>
+#include <sbi_utils/irqchip/imsic.h>
#include <sbi_utils/serial/fdt_serial.h>
#include <sbi_utils/timer/fdt_timer.h>
#include <sbi_utils/ipi/fdt_ipi.h>
@@ -56,6 +57,7 @@ static void fw_platform_lookup_special(void *fdt, int root_offset)
}
extern struct sbi_platform platform;
+static bool platform_has_mlevel_imsic = false;
static u32 generic_hart_index2id[SBI_HARTMASK_MAX_BITS] = { 0 };
/*
@@ -110,6 +112,8 @@ unsigned long fw_platform_init(unsigned long arg0, unsigned long arg1,
platform.hart_count = hart_count;
+ platform_has_mlevel_imsic = fdt_check_imsic_mlevel(fdt);
+
/* Return original FDT pointer */
return arg1;
@@ -118,6 +122,13 @@ fail:
wfi();
}
+static int generic_nascent_init(void)
+{
+ if (platform_has_mlevel_imsic)
+ imsic_local_irqchip_init();
+ return 0;
+}
+
static int generic_early_init(bool cold_boot)
{
if (!generic_plat || !generic_plat->early_init)
@@ -210,6 +221,7 @@ static uint64_t generic_pmu_xlate_to_mhpmevent(uint32_t event_idx,
}
const struct sbi_platform_operations platform_ops = {
+ .nascent_init = generic_nascent_init,
.early_init = generic_early_init,
.final_init = generic_final_init,
.early_exit = generic_early_exit,
--
2.25.1
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