[PATCH 2/3] rockchip: efuse: add support for RK3328 non-secure efuse

[Jonas Karlman]

From: Joseph Chen <chenjh at rock-chips.com>

Extend rockchip efuse driver with support for RK3328 non-secure efuse.

Signed-off-by: Joseph Chen <chenjh at rock-chips.com>
Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
 drivers/misc/rockchip-efuse.c | 67 +++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/drivers/misc/rockchip-efuse.c b/drivers/misc/rockchip-efuse.c
index 20423544d9..9b5a525322 100644
--- a/drivers/misc/rockchip-efuse.c
+++ b/drivers/misc/rockchip-efuse.c
@@ -13,6 +13,7 @@
 #include <dm.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
+#include <malloc.h>
 #include <misc.h>
 
 #define RK3399_A_SHIFT          16
@@ -36,6 +37,13 @@
 #define RK3288_STROBE           BIT(1)
 #define RK3288_CSB              BIT(0)
 
+#define RK3328_INT_STATUS	0x0018
+#define RK3328_DOUT		0x0020
+#define RK3328_AUTO_CTRL	0x0024
+#define RK3328_INT_FINISH	BIT(0)
+#define RK3328_AUTO_ENB		BIT(0)
+#define RK3328_AUTO_RD		BIT(1)
+
 typedef int (*EFUSE_READ)(struct udevice *dev, int offset, void *buf, int size);
 
 struct rockchip_efuse_regs {
@@ -46,6 +54,10 @@ struct rockchip_efuse_regs {
 	u32 jtag_pass; /* 0x10  JTAG password */
 	u32 strobe_finish_ctrl;
 		       /* 0x14	efuse strobe finish control register */
+	u32 int_status;/* 0x18 */
+	u32 reserved;  /* 0x1c */
+	u32 dout2;     /* 0x20 */
+	u32 auto_ctrl; /* 0x24 */
 };
 
 struct rockchip_efuse_platdata {
@@ -181,6 +193,57 @@ static int rockchip_rk3288_efuse_read(struct udevice *dev, int offset,
 	return 0;
 }
 
+static int rockchip_rk3328_efuse_read(struct udevice *dev, int offset,
+				      void *buf, int size)
+{
+	struct rockchip_efuse_platdata *plat = dev_get_platdata(dev);
+	struct rockchip_efuse_regs *efuse =
+		(struct rockchip_efuse_regs *)plat->base;
+	unsigned int addr_start, addr_end, addr_offset, addr_len;
+	u32 out_value, status;
+	u8 *buffer;
+	int ret = 0, i = 0, j = 0;
+
+	/* Max non-secure Byte */
+	if (size > 32)
+		size = 32;
+
+	/* 128 Byte efuse, 96 Byte for secure, 32 Byte for non-secure */
+	offset += 96;
+	addr_start = rounddown(offset, RK3399_BYTES_PER_FUSE) /
+						RK3399_BYTES_PER_FUSE;
+	addr_end = roundup(offset + size, RK3399_BYTES_PER_FUSE) /
+						RK3399_BYTES_PER_FUSE;
+	addr_offset = offset % RK3399_BYTES_PER_FUSE;
+	addr_len = addr_end - addr_start;
+
+	buffer = calloc(1, sizeof(*buffer) * addr_len * RK3399_BYTES_PER_FUSE);
+	if (!buffer)
+		return -ENOMEM;
+
+	for (j = 0; j < addr_len; j++) {
+		writel(RK3328_AUTO_RD | RK3328_AUTO_ENB |
+		       ((addr_start++ & RK3399_A_MASK) << RK3399_A_SHIFT),
+		       &efuse->auto_ctrl);
+		udelay(5);
+		status = readl(&efuse->int_status);
+		if (!(status & RK3328_INT_FINISH)) {
+			ret = -EIO;
+			goto err;
+		}
+		out_value = readl(&efuse->dout2);
+		writel(RK3328_INT_FINISH, &efuse->int_status);
+
+		memcpy(&buffer[i], &out_value, RK3399_BYTES_PER_FUSE);
+		i += RK3399_BYTES_PER_FUSE;
+	}
+	memcpy(buf, buffer + addr_offset, size);
+err:
+	free(buffer);
+
+	return ret;
+}
+
 static int rockchip_efuse_read(struct udevice *dev, int offset,
 			       void *buf, int size)
 {
@@ -226,6 +289,10 @@ static const struct udevice_id rockchip_efuse_ids[] = {
 		.compatible = "rockchip,rk3368-efuse",
 		.data = (ulong)&rockchip_rk3288_efuse_read,
 	},
+	{
+		.compatible = "rockchip,rk3328-efuse",
+		.data = (ulong)&rockchip_rk3328_efuse_read,
+	},
 	{
 		.compatible = "rockchip,rk3399-efuse",
 		.data = (ulong)&rockchip_rk3399_efuse_read,
-- 
2.17.1