lib: sbi_ipi: Move initial IPI clear to sbi_ipi_init()

sbi_ipi_init() expects the platform warm init function to clear IPIs
on the local hart, but there is already a generic function to do this.
After this change, none of the existing drivers need a warm init
callback.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

lib/sbi/sbi_hsm.c

@@ -178,7 +178,7 @@ static void sbi_hsm_hart_wait(struct sbi_scratch *scratch)
 
 	/*
 	 * No need to clear IPI here because the sbi_ipi_init() will
-	 * clear it for current HART via sbi_platform_ipi_init().
+	 * clear it for current HART.
 	 */
 }
 

lib/sbi/sbi_ipi.c

@@ -332,14 +332,14 @@ int sbi_ipi_init(struct sbi_scratch *scratch, bool cold_boot)
 	ipi_data = sbi_scratch_offset_ptr(scratch, ipi_data_off);
 	ipi_data->ipi_type = 0x00;
 
-	/*
-	 * Initialize platform IPI support. This will also clear any
-	 * pending IPIs for current/calling HART.
-	 */
+	/* Initialize platform IPI support */
 	ret = sbi_platform_ipi_init(sbi_platform_ptr(scratch), cold_boot);
 	if (ret)
 		return ret;
 
+	/* Clear any pending IPIs for the current hart */
+	sbi_ipi_raw_clear();
+
 	/* Enable software interrupts */
 	csr_set(CSR_MIE, MIP_MSIP);
 

lib/utils/ipi/aclint_mswi.c

@@ -66,14 +66,6 @@ static struct sbi_ipi_device aclint_mswi = {
 	.ipi_clear = mswi_ipi_clear
 };
 
-int aclint_mswi_warm_init(void)
-{
-	/* Clear IPI for current HART */
-	mswi_ipi_clear();
-
-	return 0;
-}
-
 int aclint_mswi_cold_init(struct aclint_mswi_data *mswi)
 {
 	u32 i;

lib/utils/ipi/andes_plicsw.c

@@ -65,14 +65,6 @@ static struct sbi_ipi_device plicsw_ipi = {
 	.ipi_clear = plicsw_ipi_clear
 };
 
-int plicsw_warm_ipi_init(void)
-{
-	/* Clear PLICSW IPI */
-	plicsw_ipi_clear();
-
-	return 0;
-}
-
 int plicsw_cold_ipi_init(struct plicsw_data *plicsw)
 {
 	int rc;

lib/utils/ipi/fdt_ipi_mswi.c

@@ -64,6 +64,6 @@ static const struct fdt_match ipi_mswi_match[] = {
 struct fdt_ipi fdt_ipi_mswi = {
 	.match_table = ipi_mswi_match,
 	.cold_init = ipi_mswi_cold_init,
-	.warm_init = aclint_mswi_warm_init,
+	.warm_init = NULL,
 	.exit = NULL,
 };

lib/utils/ipi/fdt_ipi_plicsw.c

@@ -42,6 +42,6 @@ static const struct fdt_match ipi_plicsw_match[] = {
 struct fdt_ipi fdt_ipi_plicsw = {
 	.match_table = ipi_plicsw_match,
 	.cold_init   = fdt_plicsw_cold_ipi_init,
-	.warm_init   = plicsw_warm_ipi_init,
+	.warm_init   = NULL,
 	.exit	     = NULL,
 };