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Subject[char-misc-next 1/3] mei me: add handler for me_hw_ops fw_status
Date
FW status is read from mei pci configuration space.
The register address depends on the plataform id

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/hw-me-regs.h | 9 +++++++++
drivers/misc/mei/hw-me.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)

diff --git a/drivers/misc/mei/hw-me-regs.h b/drivers/misc/mei/hw-me-regs.h
index 6a203b6..3f612ce 100644
--- a/drivers/misc/mei/hw-me-regs.h
+++ b/drivers/misc/mei/hw-me-regs.h
@@ -111,10 +111,19 @@

#define MEI_DEV_ID_LPT 0x8C3A /* Lynx Point */
#define MEI_DEV_ID_LPT_LP 0x9C3A /* Lynx Point LP */
+
/*
* MEI HW Section
*/

+/* Host Firmware Status in Platforms < LPT */
+#define PCI_CFG_HFS_PPT 0x40
+/* Host Firmware Status in Platforms >= LPT */
+#define PCI_CFG_HFS_LPT 0x60
+# define PCI_CFG_HFS_STATE_MSK 0x0000000F
+# define PCI_CFG_HFS_ISR_CNT_MSK 0x00000600
+# define PCI_CFG_HFS_ERR_CODE_MSK 0x0000F000
+
/* MEI registers */
/* H_CB_WW - Host Circular Buffer (CB) Write Window register */
#define H_CB_WW 0
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index b22c7e2..2346167 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -536,8 +536,38 @@ end:

return IRQ_HANDLED;
}
+
+/**
+ * mei_me_fw_status - retrieve fw status from the pci config space
+ *
+ * @dev: the device structure
+ * @fw_status: fw status register value
+ *
+ * returns 0 on success an error code otherwise
+ */
+static int mei_me_fw_status(struct mei_device *dev, u32 *fw_status)
+{
+ u32 reg;
+ if (!dev || !fw_status)
+ return -EINVAL;
+
+ switch (dev->pdev->device) {
+ case MEI_DEV_ID_LPT:
+ case MEI_DEV_ID_LPT_LP:
+ reg = PCI_CFG_HFS_LPT;
+ break;
+ default:
+ reg = PCI_CFG_HFS_PPT;
+ break;
+ }
+
+ return pci_read_config_dword(dev->pdev, reg, fw_status);
+}
+
static const struct mei_hw_ops mei_me_hw_ops = {

+ .fw_status = mei_me_fw_status,
+
.host_is_ready = mei_me_host_is_ready,

.hw_is_ready = mei_me_hw_is_ready,
--
1.8.1.2


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