lib: sbi: Simplify ipi platform operations

Instead of having ipi_send() and ipi_clear() callbacks in
platform operations, it will be much simpler for ipi driver
to directly register these operations as a device to sbi_ipi
implementation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

lib/sbi/sbi_hsm.c

@@ -238,7 +238,7 @@ int sbi_hsm_hart_start(struct sbi_scratch *scratch,
 		return sbi_platform_hart_start(plat, hartid,
 					       scratch->warmboot_addr);
 	} else {
-		sbi_platform_ipi_send(plat, hartid);
+		sbi_ipi_raw_send(hartid);
 	}
 
 	return 0;

lib/sbi/sbi_init.c

@@ -178,8 +178,6 @@ static void wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
 
 static void wake_coldboot_harts(struct sbi_scratch *scratch, u32 hartid)
 {
-	const struct sbi_platform *plat = sbi_platform_ptr(scratch);
-
 	/* Mark coldboot done */
 	__smp_store_release(&coldboot_done, 1);
 
@@ -190,7 +188,7 @@ static void wake_coldboot_harts(struct sbi_scratch *scratch, u32 hartid)
 	for (int i = 0; i <= sbi_scratch_last_hartid(); i++) {
 		if ((i != hartid) &&
 		    sbi_hartmask_test_hart(i, &coldboot_wait_hmask))
-			sbi_platform_ipi_send(plat, i);
+			sbi_ipi_raw_send(i);
 	}
 
 	/* Release coldboot lock */

lib/sbi/sbi_ipi.c

@@ -25,7 +25,7 @@ struct sbi_ipi_data {
 };
 
 static unsigned long ipi_data_off;
-
+static const struct sbi_ipi_device *ipi_dev = NULL;
 static const struct sbi_ipi_event_ops *ipi_ops_array[SBI_IPI_EVENT_MAX];
 
 static int sbi_ipi_send(struct sbi_scratch *scratch, u32 remote_hartid,
@@ -33,7 +33,6 @@ static int sbi_ipi_send(struct sbi_scratch *scratch, u32 remote_hartid,
 {
 	int ret;
 	struct sbi_scratch *remote_scratch = NULL;
-	const struct sbi_platform *plat = sbi_platform_ptr(scratch);
 	struct sbi_ipi_data *ipi_data;
 	const struct sbi_ipi_event_ops *ipi_ops;
 
@@ -61,7 +60,9 @@ static int sbi_ipi_send(struct sbi_scratch *scratch, u32 remote_hartid,
 	 */
 	atomic_raw_set_bit(event, &ipi_data->ipi_type);
 	smp_wmb();
-	sbi_platform_ipi_send(plat, remote_hartid);
+
+	if (ipi_dev && ipi_dev->ipi_send)
+		ipi_dev->ipi_send(remote_hartid);
 
 	if (ipi_ops->sync)
 		ipi_ops->sync(scratch);
@@ -178,12 +179,12 @@ void sbi_ipi_process(void)
 	unsigned int ipi_event;
 	const struct sbi_ipi_event_ops *ipi_ops;
 	struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
-	const struct sbi_platform *plat = sbi_platform_ptr(scratch);
 	struct sbi_ipi_data *ipi_data =
 			sbi_scratch_offset_ptr(scratch, ipi_data_off);
-
 	u32 hartid = current_hartid();
-	sbi_platform_ipi_clear(plat, hartid);
+
+	if (ipi_dev && ipi_dev->ipi_clear)
+		ipi_dev->ipi_clear(hartid);
 
 	ipi_type = atomic_raw_xchg_ulong(&ipi_data->ipi_type, 0);
 	ipi_event = 0;
@@ -201,6 +202,25 @@ skip:
 	};
 }
 
+void sbi_ipi_raw_send(u32 target_hart)
+{
+	if (ipi_dev && ipi_dev->ipi_send)
+		ipi_dev->ipi_send(target_hart);
+}
+
+const struct sbi_ipi_device *sbi_ipi_get_device(void)
+{
+	return ipi_dev;
+}
+
+void sbi_ipi_set_device(const struct sbi_ipi_device *dev)
+{
+	if (!dev || ipi_dev)
+		return;
+
+	ipi_dev = dev;
+}
+
 int sbi_ipi_init(struct sbi_scratch *scratch, bool cold_boot)
 {
 	int ret;

lib/utils/ipi/fdt_ipi.c

@@ -17,35 +17,15 @@ static struct fdt_ipi *ipi_drivers[] = {
 	&fdt_ipi_clint
 };
 
-static void dummy_send(u32 target_hart)
-{
-}
-
-static void dummy_clear(u32 target_hart)
-{
-}
-
 static struct fdt_ipi dummy = {
 	.match_table = NULL,
 	.cold_init = NULL,
 	.warm_init = NULL,
 	.exit = NULL,
-	.send = dummy_send,
-	.clear = dummy_clear
 };
 
 static struct fdt_ipi *current_driver = &dummy;
 
-void fdt_ipi_send(u32 target_hart)
-{
-	current_driver->send(target_hart);
-}
-
-void fdt_ipi_clear(u32 target_hart)
-{
-	current_driver->clear(target_hart);
-}
-
 void fdt_ipi_exit(void)
 {
 	if (current_driver->exit)

lib/utils/ipi/fdt_ipi_clint.c

@@ -45,6 +45,4 @@ struct fdt_ipi fdt_ipi_clint = {
 	.cold_init = ipi_clint_cold_init,
 	.warm_init = clint_warm_ipi_init,
 	.exit = NULL,
-	.send = clint_ipi_send,
-	.clear = clint_ipi_clear,
 };

lib/utils/sys/clint.c

@@ -13,6 +13,7 @@
 #include <sbi/sbi_domain.h>
 #include <sbi/sbi_error.h>
 #include <sbi/sbi_hartmask.h>
+#include <sbi/sbi_ipi.h>
 #include <sbi/sbi_timer.h>
 #include <sbi_utils/sys/clint.h>
 
@@ -27,7 +28,7 @@
 
 static struct clint_data *clint_ipi_hartid2data[SBI_HARTMASK_MAX_BITS];
 
-void clint_ipi_send(u32 target_hart)
+static void clint_ipi_send(u32 target_hart)
 {
 	struct clint_data *clint;
 
@@ -41,7 +42,7 @@ void clint_ipi_send(u32 target_hart)
 	writel(1, &clint->ipi[target_hart - clint->first_hartid]);
 }
 
-void clint_ipi_clear(u32 target_hart)
+static void clint_ipi_clear(u32 target_hart)
 {
 	struct clint_data *clint;
 
@@ -55,6 +56,12 @@ void clint_ipi_clear(u32 target_hart)
 	writel(0, &clint->ipi[target_hart - clint->first_hartid]);
 }
 
+static struct sbi_ipi_device clint_ipi = {
+	.name = "clint",
+	.ipi_send = clint_ipi_send,
+	.ipi_clear = clint_ipi_clear
+};
+
 int clint_warm_ipi_init(void)
 {
 	/* Clear CLINT IPI for current HART */
@@ -66,6 +73,7 @@ int clint_warm_ipi_init(void)
 int clint_cold_ipi_init(struct clint_data *clint)
 {
 	u32 i;
+	int rc;
 	struct sbi_domain_memregion reg;
 
 	if (!clint)
@@ -82,7 +90,13 @@ int clint_cold_ipi_init(struct clint_data *clint)
 	sbi_domain_memregion_init(clint->addr + CLINT_IPI_OFF,
 				  CLINT_IPI_SIZE,
 				  SBI_DOMAIN_MEMREGION_MMIO, &reg);
-	return sbi_domain_root_add_memregion(&reg);
+	rc = sbi_domain_root_add_memregion(&reg);
+	if (rc)
+		return rc;
+
+	sbi_ipi_set_device(&clint_ipi);
+
+	return 0;
 }
 
 static struct clint_data *clint_timer_hartid2data[SBI_HARTMASK_MAX_BITS];