As the PCC shared memory could be in IO region which doesn't
support caching, this patch simply uses ioremap() for IO region.
Signed-off-by: Hoan Tran <hotran@xxxxxxx>
---
drivers/hwmon/xgene-hwmon.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/hwmon/xgene-hwmon.c b/drivers/hwmon/xgene-hwmon.c
index 5cd327e..2dac1ed 100644
--- a/drivers/hwmon/xgene-hwmon.c
+++ b/drivers/hwmon/xgene-hwmon.c
@@ -32,6 +32,7 @@
#include <linux/kfifo.h>
#include <linux/mailbox_controller.h>
#include <linux/mailbox_client.h>
+#include <linux/memblock.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
@@ -135,6 +136,14 @@ static u16 xgene_word_tst_and_clr(u16 *addr, u16 mask)
return ret;
}
+static void __iomem *pcc_ioremap(phys_addr_t phys, size_t size)
+{
+ if (!memblock_is_memory(phys))
+ return ioremap(phys, size);
+
+ return memremap(phys, size, MEMREMAP_WB);
+}
+
static int xgene_hwmon_pcc_rd(struct xgene_hwmon_dev *ctx, u32 *msg)
{
struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
@@ -690,9 +699,8 @@ static int xgene_hwmon_probe(struct platform_device *pdev)
*/
ctx->comm_base_addr = cppc_ss->base_address;
if (ctx->comm_base_addr) {
- ctx->pcc_comm_addr = memremap(ctx->comm_base_addr,
- cppc_ss->length,
- MEMREMAP_WB);
+ ctx->pcc_comm_addr = pcc_ioremap(ctx->comm_base_addr,
+ cppc_ss->length);
} else {
dev_err(&pdev->dev, "Failed to get PCC comm region\n");
rc = -ENODEV;
--
1.9.1
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