lib: utils/fdt: Extend fdt_parse_aclint_node() function

The fdt_parse_aclint_node() is used to parse DT node for SiFive
CLINT, ACLINT MTIMER, and ACLINT MSWI devices.

The ACLINT MTIMER has undergone following changes:
1) MTIMER DT node now requires separate addresses in for MTIME
   register and MTIMECMPx registers in the reg DT property.
2) MTIMER DT node might have no interrupts-extended DT property
   when the MTIMER device has no associated HARTs (i.e. the
   MTIMER device has no MTIMECMPx registers)

This patch extends fdt_parse_aclint_node() to handle above
mentioned changes in ACLINT MTIMER DT bindings.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

include/sbi_utils/fdt/fdt_helper.h

@@ -72,7 +72,8 @@ int fdt_parse_plic_node(void *fdt, int nodeoffset, struct plic_data *plic);
 int fdt_parse_plic(void *fdt, struct plic_data *plic, const char *compat);
 
 int fdt_parse_aclint_node(void *fdt, int nodeoffset, bool for_timer,
-			  unsigned long *out_addr, unsigned long *out_size,
+			  unsigned long *out_addr1, unsigned long *out_size1,
+			  unsigned long *out_addr2, unsigned long *out_size2,
 			  u32 *out_first_hartid, u32 *out_hart_count);
 
 int fdt_parse_compat_addr(void *fdt, uint64_t *addr,

lib/utils/fdt/fdt_helper.c

@@ -481,38 +481,50 @@ int fdt_parse_plic(void *fdt, struct plic_data *plic, const char *compat)
 }
 
 int fdt_parse_aclint_node(void *fdt, int nodeoffset, bool for_timer,
-			  unsigned long *out_addr, unsigned long *out_size,
+			  unsigned long *out_addr1, unsigned long *out_size1,
+			  unsigned long *out_addr2, unsigned long *out_size2,
 			  u32 *out_first_hartid, u32 *out_hart_count)
 {
 	const fdt32_t *val;
 	uint64_t reg_addr, reg_size;
 	int i, rc, count, cpu_offset, cpu_intc_offset;
-	u32 phandle, hwirq, hartid, first_hartid, last_hartid;
+	u32 phandle, hwirq, hartid, first_hartid, last_hartid, hart_count;
 	u32 match_hwirq = (for_timer) ? IRQ_M_TIMER : IRQ_M_SOFT;
 
 	if (nodeoffset < 0 || !fdt ||
-	    !out_addr || !out_size ||
+	    !out_addr1 || !out_size1 ||
 	    !out_first_hartid || !out_hart_count)
 		return SBI_EINVAL;
 
 	rc = fdt_get_node_addr_size(fdt, nodeoffset, 0,
 				    &reg_addr, &reg_size);
-	if (rc < 0 || !reg_addr || !reg_size)
+	if (rc < 0 || !reg_size)
 		return SBI_ENODEV;
-	*out_addr = reg_addr;
+	*out_addr1 = reg_addr;
-	*out_size = reg_size;
+	*out_size1 = reg_size;
+
+	rc = fdt_get_node_addr_size(fdt, nodeoffset, 1,
+				    &reg_addr, &reg_size);
+	if (rc < 0 || !reg_size)
+		reg_addr = reg_size = 0;
+	if (out_addr2)
+		*out_addr2 = reg_addr;
+	if (out_size2)
+		*out_size2 = reg_size;
+
+	*out_first_hartid = 0;
+	*out_hart_count = 0;
 
 	val = fdt_getprop(fdt, nodeoffset, "interrupts-extended", &count);
 	if (!val || count < sizeof(fdt32_t))
-		return SBI_ENODEV;
+		return 0;
 	count = count / sizeof(fdt32_t);
 
 	first_hartid = -1U;
-	last_hartid = 0;
+	hart_count = last_hartid = 0;
-	*out_hart_count = 0;
+	for (i = 0; i < (count / 2); i++) {
-	for (i = 0; i < count; i += 2) {
+		phandle = fdt32_to_cpu(val[2 * i]);
-		phandle = fdt32_to_cpu(val[i]);
+		hwirq = fdt32_to_cpu(val[(2 * i) + 1]);
-		hwirq = fdt32_to_cpu(val[i + 1]);
 
 		cpu_intc_offset = fdt_node_offset_by_phandle(fdt, phandle);
 		if (cpu_intc_offset < 0)
@@ -534,17 +546,15 @@ int fdt_parse_aclint_node(void *fdt, int nodeoffset, bool for_timer,
 				first_hartid = hartid;
 			if (hartid > last_hartid)
 				last_hartid = hartid;
-			(*out_hart_count)++;
+			hart_count++;
 		}
 	}
 
-	if ((last_hartid < first_hartid) || first_hartid == -1U)
+	if ((last_hartid >= first_hartid) && first_hartid != -1U) {
-		return SBI_ENODEV;
-
 		*out_first_hartid = first_hartid;
 		count = last_hartid - first_hartid + 1;
-	if (*out_hart_count < count)
+		*out_hart_count = (hart_count < count) ? hart_count : count;
-		*out_hart_count = count;
+	}
 
 	return 0;
 }

lib/utils/ipi/fdt_ipi_mswi.c

@@ -28,7 +28,8 @@ static int ipi_mswi_cold_init(void *fdt, int nodeoff,
 		return SBI_ENOSPC;
 	ms = &mswi[mswi_count];
 
-	rc = fdt_parse_aclint_node(fdt, nodeoff, false, &ms->addr, &ms->size,
+	rc = fdt_parse_aclint_node(fdt, nodeoff, false,
+				   &ms->addr, &ms->size, NULL, NULL,
 				   &ms->first_hartid, &ms->hart_count);
 	if (rc)
 		return rc;

lib/utils/timer/fdt_timer_mtimer.c

@@ -22,7 +22,7 @@ static int timer_mtimer_cold_init(void *fdt, int nodeoff,
 				  const struct fdt_match *match)
 {
 	int rc;
-	unsigned long offset, addr, size;
+	unsigned long offset, addr[2], size[2];
 	struct aclint_mtimer_data *mt, *mtmaster = NULL;
 
 	if (MTIMER_MAX_NR <= mtimer_count)
@@ -31,18 +31,19 @@ static int timer_mtimer_cold_init(void *fdt, int nodeoff,
 	if (0 < mtimer_count)
 		mtmaster = &mtimer[0];
 
-	rc = fdt_parse_aclint_node(fdt, nodeoff, true, &addr, &size,
+	rc = fdt_parse_aclint_node(fdt, nodeoff, true,
+				   &addr[0], &size[0], &addr[1], &size[1],
 				   &mt->first_hartid, &mt->hart_count);
 	if (rc)
 		return rc;
 	mt->has_64bit_mmio = true;
 
-	mt->mtimecmp_addr = addr + ACLINT_DEFAULT_MTIMECMP_OFFSET;
+	if (match->data) { /* SiFive CLINT */
+		/* Set CLINT addresses */
+		mt->mtimecmp_addr = addr[0] + ACLINT_DEFAULT_MTIMECMP_OFFSET;
 		mt->mtimecmp_size = ACLINT_DEFAULT_MTIMECMP_SIZE;
-	mt->mtime_addr = addr + ACLINT_DEFAULT_MTIME_OFFSET;
+		mt->mtime_addr = addr[0] + ACLINT_DEFAULT_MTIME_OFFSET;
-	mt->mtime_size = size - mt->mtimecmp_size;
+		mt->mtime_size = size[0] - mt->mtimecmp_size;
-
-	if (match->data) {
 		/* Adjust MTIMER address and size for CLINT device */
 		offset = *((unsigned long *)match->data);
 		mt->mtime_addr += offset;
@@ -51,6 +52,12 @@ static int timer_mtimer_cold_init(void *fdt, int nodeoff,
 		/* Parse additional CLINT properties */
 		if (fdt_getprop(fdt, nodeoff, "clint,has-no-64bit-mmio", &rc))
 			mt->has_64bit_mmio = false;
+	} else { /* RISC-V ACLINT MTIMER */
+		/* Set ACLINT MTIMER addresses */
+		mt->mtime_addr = addr[0];
+		mt->mtime_size = size[0];
+		mt->mtimecmp_addr = addr[1];
+		mt->mtimecmp_size = size[1];
 	}
 
 	rc = aclint_mtimer_cold_init(mt, mtmaster);