[PATCH v4 03/38] platform/x86: intel_scu_ipc: Add constants for register offsets

Mika Westerberg
2020-01-21T16:03:07Z

This makes the code more readable. These are taken from intel_pmc_ipc.c
which implements the same thing.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/platform/x86/intel_scu_ipc.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c
index cdab916fbf92..a8be5bcb9832 100644
--- a/drivers/platform/x86/intel_scu_ipc.c
+++ b/drivers/platform/x86/intel_scu_ipc.c
@@ -99,11 +99,15 @@ struct intel_scu_ipc_dev {

static struct intel_scu_ipc_dev ipcdev; /* Only one for now */

+#define IPC_STATUS 0x04
+#define IPC_STATUS_ERR BIT(1)
+#define IPC_STATUS_BUSY BIT(0)
+
/*
- * IPC Read Buffer (Read Only):
- * 16 byte buffer for receiving data from SCU, if IPC command
- * processing results in response data
+ * IPC Write/Read Buffers:
+ * 16 byte buffer for sending and receiving data to and from SCU.
*/
+#define IPC_WRITE_BUFFER 0x80
#define IPC_READ_BUFFER 0x90

#define IPC_I2C_CNTRL_ADDR 0
@@ -135,7 +139,7 @@ static inline void ipc_command(struct intel_scu_ipc_dev *scu, u32 cmd)
*/
static inline void ipc_data_writel(struct intel_scu_ipc_dev *scu, u32 data, u32 offset)
{
- writel(data, scu->ipc_base + 0x80 + offset);
+ writel(data, scu->ipc_base + IPC_WRITE_BUFFER + offset);
}

/*
@@ -147,7 +151,7 @@ static inline void ipc_data_writel(struct intel_scu_ipc_dev *scu, u32 data, u32
*/
static inline u8 ipc_read_status(struct intel_scu_ipc_dev *scu)
{
- return __raw_readl(scu->ipc_base + 0x04);
+ return __raw_readl(scu->ipc_base + IPC_STATUS);
}

/* Read ipc byte data */
@@ -169,17 +173,17 @@ static inline int busy_loop(struct intel_scu_ipc_dev *scu)
u32 loop_count = 100000;

/* break if scu doesn't reset busy bit after huge retry */
- while ((status & BIT(0)) && --loop_count) {
+ while ((status & IPC_STATUS_BUSY) && --loop_count) {
udelay(1); /* scu processing time is in few u secods */
status = ipc_read_status(scu);
}

- if (status & BIT(0)) {
+ if (status & IPC_STATUS_BUSY) {
dev_err(scu->dev, "IPC timed out");
return -ETIMEDOUT;
}

- if (status & BIT(1))
+ if (status & IPC_STATUS_ERR)
return -EIO;

return 0;
@@ -196,7 +200,7 @@ static inline int ipc_wait_for_interrupt(struct intel_scu_ipc_dev *scu)
}

status = ipc_read_status(scu);
- if (status & BIT(1))
+ if (status & IPC_STATUS_ERR)
return -EIO;

return 0;
--
2.24.1