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Subject[PATCH v4] hwmon: xgene: Support hwmon v2
Date
This patch supports xgene-hwmon v2 which uses the non-cachable memory
as the PCC shared memory.

Signed-off-by: Hoan Tran <hotran@apm.com>
---
v4
- Initialize version variable

v3
- Use local version variable
- Use inline calls instead of the private map function

v2
- Map PCC shared mem by ioremap() in case hwmon is v2

drivers/hwmon/xgene-hwmon.c | 40 +++++++++++++++++++++++++++++++---------
1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/drivers/hwmon/xgene-hwmon.c b/drivers/hwmon/xgene-hwmon.c
index 9c0dbb8..b4e3f11 100644
--- a/drivers/hwmon/xgene-hwmon.c
+++ b/drivers/hwmon/xgene-hwmon.c
@@ -91,6 +91,11 @@
#define to_xgene_hwmon_dev(cl) \
container_of(cl, struct xgene_hwmon_dev, mbox_client)

+enum xgene_hwmon_version {
+ XGENE_HWMON_V1 = 0,
+ XGENE_HWMON_V2 = 1,
+};
+
struct slimpro_resp_msg {
u32 msg;
u32 param1;
@@ -609,6 +614,15 @@ static void xgene_hwmon_tx_done(struct mbox_client *cl, void *msg, int ret)
}
}

+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_hwmon_acpi_match[] = {
+ {"APMC0D29", XGENE_HWMON_V1},
+ {"APMC0D8A", XGENE_HWMON_V2},
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, xgene_hwmon_acpi_match);
+#endif
+
static int xgene_hwmon_probe(struct platform_device *pdev)
{
struct xgene_hwmon_dev *ctx;
@@ -650,6 +664,16 @@ static int xgene_hwmon_probe(struct platform_device *pdev)
}
} else {
struct acpi_pcct_hw_reduced *cppc_ss;
+ int version = XGENE_HWMON_V1;
+#ifdef CONFIG_ACPI
+ const struct acpi_device_id *acpi_id;
+
+ acpi_id = acpi_match_device(xgene_hwmon_acpi_match, &pdev->dev);
+ if (!acpi_id)
+ return -EINVAL;
+
+ version = (int)acpi_id->driver_data;
+#endif

if (device_property_read_u32(&pdev->dev, "pcc-channel",
&ctx->mbox_idx)) {
@@ -690,7 +714,13 @@ 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,
+ if (version == XGENE_HWMON_V2)
+ ctx->pcc_comm_addr = (void __force *)ioremap(
+ ctx->comm_base_addr,
+ cppc_ss->length);
+ else
+ ctx->pcc_comm_addr = memremap(
+ ctx->comm_base_addr,
cppc_ss->length,
MEMREMAP_WB);
} else {
@@ -758,14 +788,6 @@ static int xgene_hwmon_remove(struct platform_device *pdev)
return 0;
}

-#ifdef CONFIG_ACPI
-static const struct acpi_device_id xgene_hwmon_acpi_match[] = {
- {"APMC0D29", 0},
- {},
-};
-MODULE_DEVICE_TABLE(acpi, xgene_hwmon_acpi_match);
-#endif
-
static const struct of_device_id xgene_hwmon_of_match[] = {
{.compatible = "apm,xgene-slimpro-hwmon"},
{}
--
1.9.1
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