[PATCH v4 1/6] mfd: rtsx: add func to split u32 into register

[micky_ching at realsil.com.cn]

From: Micky Ching <micky_ching at realsil.com.cn>

Add helper function to write u32 to registers, if we want to put u32
value to 4 continuous register, this can help us reduce tedious work.

Signed-off-by: Micky Ching <micky_ching at realsil.com.cn>
Acked-by: Lee Jones <lee.jones at linaro.org>
---
 include/linux/mfd/rtsx_pci.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/mfd/rtsx_pci.h b/include/linux/mfd/rtsx_pci.h
index 74346d5..9234449 100644
--- a/include/linux/mfd/rtsx_pci.h
+++ b/include/linux/mfd/rtsx_pci.h
@@ -558,6 +558,7 @@
 #define SD_SAMPLE_POINT_CTL		0xFDA7
 #define SD_PUSH_POINT_CTL		0xFDA8
 #define SD_CMD0				0xFDA9
+#define   SD_CMD_START			0x40
 #define SD_CMD1				0xFDAA
 #define SD_CMD2				0xFDAB
 #define SD_CMD3				0xFDAC
@@ -967,4 +968,12 @@ static inline u8 *rtsx_pci_get_cmd_data(struct rtsx_pcr *pcr)
 	return (u8 *)(pcr->host_cmds_ptr);
 }
 
+static inline void rtsx_pci_write_be32(struct rtsx_pcr *pcr, u16 reg, u32 val)
+{
+	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, reg,     0xFF, val >> 24);
+	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, reg + 1, 0xFF, val >> 16);
+	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, reg + 2, 0xFF, val >> 8);
+	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, reg + 3, 0xFF, val);
+}
+
 #endif
-- 
1.9.1