On 10/10/2017 05:10 PM, Hoan Tran wrote:
This patch supports xgene-hwmon v2 which uses the non-cachable memory
as the PCC shared memory.
Signed-off-by: Hoan Tran <hotran@xxxxxxx>
---
v2
- Map PCC shared mem by ioremap() in case hwmon is v2
So I assume you expect me to replace the (already accepted) v1
of this patch with this one ?
Assuming the change is needed, I really have to ask: Has this version
of the patch been tested ?
drivers/hwmon/xgene-hwmon.c | 52 +++++++++++++++++++++++++++++++++++----------
1 file changed, 41 insertions(+), 11 deletions(-)
diff --git a/drivers/hwmon/xgene-hwmon.c b/drivers/hwmon/xgene-hwmon.c
index 9c0dbb8..52be7cd 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;
@@ -99,6 +104,7 @@ struct slimpro_resp_msg {
struct xgene_hwmon_dev {
struct device *dev;
+ int version;
struct mbox_chan *mbox_chan;
struct mbox_client mbox_client;
int mbox_idx;
@@ -135,6 +141,15 @@ static u16 xgene_word_tst_and_clr(u16 *addr, u16 mask)
return ret;
}
+static void *xgene_pcc_ioremap(struct xgene_hwmon_dev *ctx,
+ phys_addr_t phys, size_t size)
+{
+ if (ctx->version == XGENE_HWMON_V2)
+ return (void __force *)ioremap(phys, size);
+
Is that typecast really necessary ?
+ 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;
@@ -609,6 +624,15 @@ 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;
@@ -623,6 +647,20 @@ static int xgene_hwmon_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, ctx);
cl = &ctx->mbox_client;
+#ifdef CONFIG_ACPI
+ ctx->version = -EINVAL;
+ if (ACPI_COMPANION(&pdev->dev)) {
+ const struct acpi_device_id *acpi_id;
+
+ acpi_id = acpi_match_device(xgene_hwmon_acpi_match, &pdev->dev);
+ if (acpi_id)
+ ctx->version = (int)acpi_id->driver_data;
+ }
+
+ if (ctx->version < 0)
+ return -ENODEV;
This doesn't make sense. Just return EINVAL if acpi_id is 0 above. There
is no need to assign a negative value to ctx->version.
I also don't see why ctx->version is necessary in the first place. In reality
it is just a parameter to xgene_pcc_ioremap(). Which I think should be inline
and not a separate function.
+#endif
What if ACPI is enabled in the build but the system is running on HW which
does not support ACPI ? Is that guaranteed to never happen ? Why not use
acpi_disabled instead ?
+
spin_lock_init(&ctx->kfifo_lock);
mutex_init(&ctx->rd_mutex);
@@ -690,9 +728,9 @@ 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 = xgene_pcc_ioremap(ctx,
+ ctx->comm_base_addr,
+ cppc_ss->length);
Inline, please. The extra function adds more complexity than it is worth.
} else {
dev_err(&pdev->dev, "Failed to get PCC comm region\n");
rc = -ENODEV;
@@ -758,14 +796,6 @@ 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"},
{}
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