From: Paul Burton <paul.bur...@imgtec.com>
Add driver for the efuse block in the JZ47xx SOC.
Cc: Daniel Schwierzeck <daniel.schwierz...@gmail.com>
Signed-off-by: Paul Burton <paul.bur...@imgtec.com>
Signed-off-by: Marek Vasut <marek.va...@gmail.com>
Signed-off-by: Ezequiel Garcia <ezequ...@collabora.com>
---
drivers/misc/Kconfig | 6 +++
drivers/misc/Makefile | 1 +
drivers/misc/jz4780_efuse.c | 104 ++++++++++++++++++++++++++++++++++++
3 files changed, 111 insertions(+)
create mode 100644 drivers/misc/jz4780_efuse.c
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 48febc47d263..704c8dd1955f 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -120,6 +120,12 @@ config FSL_SEC_MON
Security Monitor can be transitioned on any security failures,
like software violations or hardware security violations.
+config JZ4780_EFUSE
+ bool "Ingenic JZ4780 eFUSE support"
+ depends on ARCH_JZ47XX
+ help
+ This selects support for the eFUSE on Ingenic JZ4780 SoCs.
+
config MXC_OCOTP
bool "Enable MXC OCOTP Driver"
help
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 302d44159274..6bdf5054f475 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -62,3 +62,4 @@ obj-$(CONFIG_TEGRA_CAR) += tegra_car.o
obj-$(CONFIG_TWL4030_LED) += twl4030_led.o
obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress_config.o
obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o
+obj-$(CONFIG_JZ4780_EFUSE) += jz4780_efuse.o
diff --git a/drivers/misc/jz4780_efuse.c b/drivers/misc/jz4780_efuse.c
new file mode 100644
index 000000000000..7b327f54b15c
--- /dev/null
+++ b/drivers/misc/jz4780_efuse.c
@@ -0,0 +1,104 @@
+/*
+ * JZ4780 EFUSE driver
+ *
+ * Copyright (c) 2014 Imagination Technologies
+ * Author: Alex Smith <alex.sm...@imgtec.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/unaligned.h>
+#include <errno.h>
+#include <mach/jz4780.h>
+#include <wait_bit.h>
+
+#define EFUSE_EFUCTRL 0xd0
+#define EFUSE_EFUCFG 0xd4
+#define EFUSE_EFUSTATE 0xd8
+#define EFUSE_EFUDATA(n) (0xdc + ((n) * 4))
+
+#define EFUSE_EFUCTRL_RD_EN BIT(0)
+#define EFUSE_EFUCTRL_LEN_BIT 16
+#define EFUSE_EFUCTRL_LEN_MASK 0x1f
+#define EFUSE_EFUCTRL_ADDR_BIT 21
+#define EFUSE_EFUCTRL_ADDR_MASK 0x1ff
+#define EFUSE_EFUCTRL_CS BIT(30)
+
+#define EFUSE_EFUCFG_RD_STROBE_BIT 16
+#define EFUSE_EFUCFG_RD_STROBE_MASK 0xf
+#define EFUSE_EFUCFG_RD_ADJ_BIT 20
+#define EFUSE_EFUCFG_RD_ADJ_MASK 0xf
+
+#define EFUSE_EFUSTATE_RD_DONE BIT(0)
+
+static void jz4780_efuse_read_chunk(size_t addr, size_t count, u8 *buf)
+{
+ void __iomem *regs = (void __iomem *)NEMC_BASE;
+ size_t i;
+ u32 val;
+ int ret;
+
+ val = EFUSE_EFUCTRL_RD_EN |
+ ((count - 1) << EFUSE_EFUCTRL_LEN_BIT) |
+ (addr << EFUSE_EFUCTRL_ADDR_BIT) |
+ ((addr > 0x200) ? EFUSE_EFUCTRL_CS : 0);
+ writel(val, regs + EFUSE_EFUCTRL);
+
+ ret = wait_for_bit_le32(regs + EFUSE_EFUSTATE,
+ EFUSE_EFUSTATE_RD_DONE, true, 10000, false);
+ if (ret)
+ return;
+
+ if ((count % 4) == 0) {
+ for (i = 0; i < count / 4; i++) {
+ val = readl(regs + EFUSE_EFUDATA(i));
+ put_unaligned(val, (u32 *)(buf + (i * 4)));
+ }
+ } else {
+ val = readl(regs + EFUSE_EFUDATA(0));
+ if (count > 2)
+ buf[2] = (val >> 16) & 0xff;
+ if (count > 1)
+ buf[1] = (val >> 8) & 0xff;
+ buf[0] = val & 0xff;
+ }
+}
+
+static inline int jz4780_efuse_chunk_size(size_t count)
+{
+ if (count >= 32)
+ return 32;
+ else if ((count / 4) > 0)
+ return (count / 4) * 4;
+ else
+ return count % 4;
+}
+
+void jz4780_efuse_read(size_t addr, size_t count, u8 *buf)
+{
+ size_t chunk;
+
+ while (count > 0) {
+ chunk = jz4780_efuse_chunk_size(count);
+ jz4780_efuse_read_chunk(addr, chunk, buf);
+ addr += chunk;
+ buf += chunk;
+ count -= chunk;
+ }
+}
+
+void jz4780_efuse_init(u32 ahb2_rate)
+{
+ void __iomem *regs = (void __iomem *)NEMC_BASE;
+ u32 rd_adj, rd_strobe, tmp;
+
+ rd_adj = (((6500 * (ahb2_rate / 1000000)) / 1000000) + 0xf) / 2;
+ tmp = (((35000 * (ahb2_rate / 1000000)) / 1000000) - 4) - rd_adj;
+ rd_strobe = ((tmp + 0xf) / 2 < 7) ? 7 : (tmp + 0xf) / 2;
+
+ tmp = (rd_adj << EFUSE_EFUCFG_RD_ADJ_BIT) |
+ (rd_strobe << EFUSE_EFUCFG_RD_STROBE_BIT);
+ writel(tmp, regs + EFUSE_EFUCFG);
+}
--
2.20.0
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