[PATCH v2 1/2] nvmem: add driver for JZ4780 efuse

From: Mathieu Malaterre
Date: Thu Dec 28 2017 - 16:30:28 EST

From: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx>

This patch brings support for the JZ4780 efuse. Currently it only expose
a read only access to the entire 8K bits efuse memory.

Tested-by: Mathieu Malaterre <malat@xxxxxxxxxx>
Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx>
Signed-off-by: Mathieu Malaterre <malat@xxxxxxxxxx>
---
.../ABI/testing/sysfs-driver-jz4780-efuse | 16 ++
.../bindings/nvmem/ingenic,jz4780-efuse.txt | 17 ++
MAINTAINERS | 5 +
arch/mips/boot/dts/ingenic/jz4780.dtsi | 40 ++-
drivers/nvmem/Kconfig | 10 +
drivers/nvmem/Makefile | 2 +
drivers/nvmem/jz4780-efuse.c | 305 +++++++++++++++++++++
7 files changed, 383 insertions(+), 12 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-driver-jz4780-efuse
create mode 100644 Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.txt
create mode 100644 drivers/nvmem/jz4780-efuse.c

diff --git a/Documentation/ABI/testing/sysfs-driver-jz4780-efuse b/Documentation/ABI/testing/sysfs-driver-jz4780-efuse
new file mode 100644
index 000000000000..bb6f5d6ceea0
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-jz4780-efuse
@@ -0,0 +1,16 @@
+What: /sys/devices/*/<our-device>/nvmem
+Date: December 2017
+Contact: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx>
+Description: read-only access to the efuse on the Ingenic JZ4780 SoC
+ The SoC has a one time programmable 8K efuse that is
+ split into segments. The driver supports read only.
+ The segments are
+ 0x000 64 bit Random Number
+ 0x008 128 bit Ingenic Chip ID
+ 0x018 128 bit Customer ID
+ 0x028 3520 bit Reserved
+ 0x1E0 8 bit Protect Segment
+ 0x1E1 2296 bit HDMI Key
+ 0x300 2048 bit Security boot key
+Users: any user space application which wants to read the Chip
+ and Customer ID
diff --git a/Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.txt b/Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.txt
new file mode 100644
index 000000000000..cd6d67ec22fc
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.txt
@@ -0,0 +1,17 @@
+Ingenic JZ EFUSE driver bindings
+
+Required properties:
+- "compatible" Must be set to "ingenic,jz4780-efuse"
+- "reg" Register location and length
+- "clocks" Handle for the ahb clock for the efuse.
+- "clock-names" Must be "bus_clk"
+
+Example:
+
+efuse: efuse@134100d0 {
+ compatible = "ingenic,jz4780-efuse";
+ reg = <0x134100D0 0xFF>;
+
+ clocks = <&cgu JZ4780_CLK_AHB2>;
+ clock-names = "bus_clk";
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index a6e86e20761e..7a050c20c533 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6902,6 +6902,11 @@ M: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@xxxxxxxxxx>
S: Maintained
F: drivers/dma/dma-jz4780.c

+INGENIC JZ4780 EFUSE Driver
+M: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx>
+S: Maintained
+F: drivers/nvmem/jz4780-efuse.c
+
INGENIC JZ4780 NAND DRIVER
M: Harvey Hunt <harveyhuntnexus@xxxxxxxxx>
L: linux-mtd@xxxxxxxxxxxxxxxxxxx
diff --git a/arch/mips/boot/dts/ingenic/jz4780.dtsi b/arch/mips/boot/dts/ingenic/jz4780.dtsi
index 9b5794667aee..3fb9d916a2ea 100644
--- a/arch/mips/boot/dts/ingenic/jz4780.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4780.dtsi
@@ -224,21 +224,37 @@
reg = <0x10002000 0x100>;
};

- nemc: nemc@13410000 {
- compatible = "ingenic,jz4780-nemc";
- reg = <0x13410000 0x10000>;
- #address-cells = <2>;
+
+ ahb2: ahb2 {
+ compatible = "simple-bus";
+ #address-cells = <1>;
#size-cells = <1>;
- ranges = <1 0 0x1b000000 0x1000000
- 2 0 0x1a000000 0x1000000
- 3 0 0x19000000 0x1000000
- 4 0 0x18000000 0x1000000
- 5 0 0x17000000 0x1000000
- 6 0 0x16000000 0x1000000>;
+ ranges = <>;
+
+ nemc: nemc@13410000 {
+ compatible = "ingenic,jz4780-nemc";
+ reg = <0x13410000 0x10000>;
+ #address-cells = <2>;
+ #size-cells = <1>;
+ ranges = <1 0 0x1b000000 0x1000000
+ 2 0 0x1a000000 0x1000000
+ 3 0 0x19000000 0x1000000
+ 4 0 0x18000000 0x1000000
+ 5 0 0x17000000 0x1000000
+ 6 0 0x16000000 0x1000000>;
+
+ clocks = <&cgu JZ4780_CLK_NEMC>;
+
+ status = "disabled";
+ };

- clocks = <&cgu JZ4780_CLK_NEMC>;
+ efuse: efuse@134100d0 {
+ compatible = "ingenic,jz4780-efuse";
+ reg = <0x134100d0 0xff>;

- status = "disabled";
+ clocks = <&cgu JZ4780_CLK_AHB2>;
+ clock-names = "bus_clk";
+ };
};

bch: bch@134d0000 {
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index ff505af064ba..75400982abac 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -36,6 +36,16 @@ config NVMEM_IMX_OCOTP
This driver can also be built as a module. If so, the module
will be called nvmem-imx-ocotp.

+config JZ4780_EFUSE
+ tristate "JZ4780 EFUSE Memory Support"
+ depends on MACH_JZ4780 || COMPILE_TEST
+ depends on HAS_IOMEM
+ help
+ Say Y here to include support for JZ4780 efuse memory found on
+ all JZ4780 SoC based devices.
+ To compile this driver as a module, choose M here: the module
+ will be called nvmem_jz4780_efuse.
+
config NVMEM_LPC18XX_EEPROM
tristate "NXP LPC18XX EEPROM Memory Support"
depends on ARCH_LPC18XX || COMPILE_TEST
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index e54dcfa6565a..3b7c18df6771 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -13,6 +13,8 @@ obj-$(CONFIG_NVMEM_IMX_IIM) += nvmem-imx-iim.o
nvmem-imx-iim-y := imx-iim.o
obj-$(CONFIG_NVMEM_IMX_OCOTP) += nvmem-imx-ocotp.o
nvmem-imx-ocotp-y := imx-ocotp.o
+obj-$(CONFIG_JZ4780_EFUSE) += nvmem_jz4780_efuse.o
+nvmem_jz4780_efuse-y := jz4780-efuse.o
obj-$(CONFIG_NVMEM_LPC18XX_EEPROM) += nvmem_lpc18xx_eeprom.o
nvmem_lpc18xx_eeprom-y := lpc18xx_eeprom.o
obj-$(CONFIG_NVMEM_LPC18XX_OTP) += nvmem_lpc18xx_otp.o
diff --git a/drivers/nvmem/jz4780-efuse.c b/drivers/nvmem/jz4780-efuse.c
new file mode 100644
index 000000000000..2490e5fc1a88
--- /dev/null
+++ b/drivers/nvmem/jz4780-efuse.c
@@ -0,0 +1,305 @@
+/*
+ * JZ4780 EFUSE Memory Support driver
+ *
+ * Copyright (c) 2017 PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
+/*
+ * Currently supports JZ4780 efuse which has 8K programmable bit.
+ * Efuse is separated into seven segments as below:
+ *
+ * -----------------------------------------------------------------------
+ * | 64 bit | 128 bit | 128 bit | 3520 bit | 8 bit | 2296 bit | 2048 bit |
+ * -----------------------------------------------------------------------
+ *
+ * The rom itself is accessed using a 9 bit address line and an 8 word wide bus
+ * which reads/writes based on strobes. The strobe is configured in the config
+ * register and is based on number of cycles of the bus clock.
+ *
+ * Driver supports read only as the writes are done in the Factory.
+ */
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+
+#define JZ_EFUCTRL (0x0) /* Control Register */
+#define JZ_EFUCFG (0x4) /* Configure Register*/
+#define JZ_EFUSTATE (0x8) /* Status Register */
+#define JZ_EFUDATA(n) (0xC + (n)*4)
+
+#define JZ_EFUSE_START_ADDR 0x200
+#define JZ_EFUSE_SEG1_OFF 0x00 /* 64 bit Random Number */
+#define JZ_EFUSE_SEG2_OFF 0x08 /* 128 bit Ingenic Chip ID */
+#define JZ_EFUSE_SEG3_OFF 0x18 /* 128 bit Customer ID */
+#define JZ_EFUSE_SEG4_OFF 0x28 /* 3520 bit Reserved */
+#define JZ_EFUSE_SEG5_OFF 0x1E0 /* 8 bit Protect Segment */
+#define JZ_EFUSE_SEG6_OFF 0x1E1 /* 2296 bit HDMI Key */
+#define JZ_EFUSE_SEG7_OFF 0x300 /* 2048 bit Security boot key */
+#define JZ_EFUSE_END_ADDR 0x5FF
+
+#define JZ_EFUSE_EFUCTRL_CS BIT(30)
+#define JZ_EFUSE_EFUCTRL_ADDR_MASK 0x1FF
+#define JZ_EFUSE_EFUCTRL_ADDR_SHIFT 21
+#define JZ_EFUSE_EFUCTRL_LEN_MASK 0x1F
+#define JZ_EFUSE_EFUCTRL_LEN_SHIFT 16
+#define JZ_EFUSE_EFUCTRL_PG_EN BIT(15)
+#define JZ_EFUSE_EFUCTRL_WR_EN BIT(1)
+#define JZ_EFUSE_EFUCTRL_RD_EN BIT(0)
+
+#define JZ_EFUSE_EFUCFG_INT_EN BIT(31)
+#define JZ_EFUSE_EFUCFG_RD_ADJ_MASK 0xF
+#define JZ_EFUSE_EFUCFG_RD_ADJ_SHIFT 20
+#define JZ_EFUSE_EFUCFG_RD_STR_MASK 0xF
+#define JZ_EFUSE_EFUCFG_RD_STR_SHIFT 16
+#define JZ_EFUSE_EFUCFG_WR_ADJ_MASK 0xF
+#define JZ_EFUSE_EFUCFG_WR_ADJ_SHIFT 12
+#define JZ_EFUSE_EFUCFG_WR_STR_MASK 0xFFF
+#define JZ_EFUSE_EFUCFG_WR_STR_SHIFT 0
+
+#define JZ_EFUSE_EFUSTATE_WR_DONE BIT(1)
+#define JZ_EFUSE_EFUSTATE_RD_DONE BIT(0)
+
+#define JZ_EFUSE_WORD_SIZE 16
+#define JZ_EFUSE_STRIDE 8
+
+struct jz4780_efuse {
+ struct device *dev;
+ void __iomem *iomem;
+ struct clk *clk;
+ unsigned int rd_adj;
+ unsigned int rd_strobe;
+};
+
+/* We read 32 byte chunks to avoid complexity in the driver. */
+static int jz4780_efuse_read_32bytes(struct jz4780_efuse *efuse, char *buf,
+ unsigned int addr)
+{
+ unsigned int tmp = 0;
+ int i = 0;
+ int timeout = 1000;
+ int size = 32;
+
+ /* 1. Set config register */
+ tmp = readl(efuse->iomem + JZ_EFUCFG);
+ tmp &= ~((JZ_EFUSE_EFUCFG_RD_ADJ_MASK << JZ_EFUSE_EFUCFG_RD_ADJ_SHIFT)
+ | (JZ_EFUSE_EFUCFG_RD_STR_MASK << JZ_EFUSE_EFUCFG_RD_STR_SHIFT));
+ tmp |= (efuse->rd_adj << JZ_EFUSE_EFUCFG_RD_ADJ_SHIFT)
+ | (efuse->rd_strobe << JZ_EFUSE_EFUCFG_RD_STR_SHIFT);
+ writel(tmp, efuse->iomem + JZ_EFUCFG);
+
+ /*
+ * 2. Set control register to indicate what to read data address,
+ * read data numbers and read enable.
+ */
+ tmp = readl(efuse->iomem + JZ_EFUCTRL);
+ tmp &= ~(JZ_EFUSE_EFUCFG_RD_STR_SHIFT
+ | (JZ_EFUSE_EFUCTRL_ADDR_MASK << JZ_EFUSE_EFUCTRL_ADDR_SHIFT)
+ | JZ_EFUSE_EFUCTRL_PG_EN | JZ_EFUSE_EFUCTRL_WR_EN
+ | JZ_EFUSE_EFUCTRL_WR_EN);
+
+ /* Need to select CS bit if address accesses upper 4Kbits memory */
+ if (addr >= (JZ_EFUSE_START_ADDR + 512))
+ tmp |= JZ_EFUSE_EFUCTRL_CS;
+
+ tmp |= (addr << JZ_EFUSE_EFUCTRL_ADDR_SHIFT)
+ | ((size - 1) << JZ_EFUSE_EFUCTRL_LEN_SHIFT)
+ | JZ_EFUSE_EFUCTRL_RD_EN;
+ writel(tmp, efuse->iomem + JZ_EFUCTRL);
+
+ /*
+ * 3. Wait status register RD_DONE set to 1 or EFUSE interrupted,
+ * software can read EFUSE data buffer 0 - 8 registers.
+ */
+ do {
+ tmp = readl(efuse->iomem + JZ_EFUSTATE);
+ usleep_range(1000, 2000);
+ if (timeout--)
+ break;
+ } while (!(tmp & JZ_EFUSE_EFUSTATE_RD_DONE));
+
+ if (timeout <= 0) {
+ dev_err(efuse->dev, "Timed out while reading\n");
+ return -EAGAIN;
+ }
+
+ for (i = 0; i < (size / 4); i++)
+ *((unsigned int *)(buf + i * 4))
+ = readl(efuse->iomem + JZ_EFUDATA(i));
+
+ return 0;
+}
+
+static unsigned int segments[][2] = {
+ /* offset , size in bytes */
+ { JZ_EFUSE_SEG1_OFF, 64 >> 3 }, /* bit Random Number */
+ { JZ_EFUSE_SEG2_OFF, 128 >> 3 }, /* bit Ingenic Chip ID */
+ { JZ_EFUSE_SEG3_OFF, 128 >> 3 }, /* bit Customer ID */
+ { JZ_EFUSE_SEG4_OFF, 3520 >> 3 }, /* bit Reserved */
+ { JZ_EFUSE_SEG5_OFF, 8 >> 3 }, /* bit Protect Segment */
+ { JZ_EFUSE_SEG6_OFF, 2296 >> 3 }, /* bit HDMI Key */
+ { JZ_EFUSE_SEG7_OFF, 2048 >> 3 } /* bit Security boot key */
+};
+
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+#define MIN(x, y) (((x) < (y)) ? (x) : (y))
+
+/* PM recommends read/write each segment separately */
+static int jz4780_efuse_read_segment(struct jz4780_efuse *efuse, int segid,
+ unsigned int *offset, char *out, size_t *bytes)
+{
+ char buf[32];
+ unsigned int lpos, buflen, ncount, remain;
+ unsigned int *segment = segments[segid];
+ int j;
+ char *cur = out;
+ int ret;
+
+ if (*bytes == 0 ||
+ (*offset < segment[0] || *offset >= segment[0] + segment[1])) {
+ // nothing to see, move along
+ return 0;
+ }
+ lpos = MAX(segment[0], *offset);
+ buflen = MIN(segment[1], *bytes);
+ ncount = buflen / 32;
+ remain = buflen % 32;
+
+ for (j = 0; j < ncount ; ++j) {
+ ret = jz4780_efuse_read_32bytes(efuse, buf, lpos);
+ if (ret < 0)
+ return ret;
+
+ memcpy(cur, buf, sizeof(buf));
+ cur += sizeof(buf);
+ lpos += sizeof(buf);
+ }
+ if (remain) {
+ ret = jz4780_efuse_read_32bytes(efuse, buf, lpos);
+ if (ret < 0)
+ return ret;
+
+ memcpy(cur, buf, remain);
+ cur += remain;
+ }
+ *offset += buflen;
+ *bytes -= buflen;
+ return buflen;
+}
+
+/* main entry point */
+static int jz4780_efuse_read(void *context, unsigned int offset,
+ void *val, size_t bytes)
+{
+ static const int nsegments = sizeof(segments) / sizeof(*segments);
+ struct jz4780_efuse *efuse = context;
+ char *cur = val;
+ int i, ret;
+
+ for (i = 0; i < nsegments; ++i) {
+ ret = jz4780_efuse_read_segment(efuse, i, &offset, cur, &bytes);
+ if (ret < 0)
+ return ret;
+ cur += ret;
+ }
+
+ return 0;
+}
+
+static struct nvmem_config jz4780_efuse_nvmem_config = {
+ .name = "jz4780-efuse",
+ .read_only = true,
+ .word_size = JZ_EFUSE_WORD_SIZE,
+ .stride = JZ_EFUSE_STRIDE,
+ .owner = THIS_MODULE,
+ .reg_read = jz4780_efuse_read,
+};
+
+static int jz4780_efuse_probe(struct platform_device *pdev)
+{
+ struct nvmem_device *nvmem;
+ struct jz4780_efuse *efuse;
+ struct resource *res;
+ unsigned long clk_rate;
+ struct device *dev = &pdev->dev;
+
+ efuse = devm_kzalloc(&pdev->dev, sizeof(*efuse), GFP_KERNEL);
+ if (!efuse)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ efuse->iomem = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (IS_ERR(efuse->iomem))
+ return PTR_ERR(efuse->iomem);
+
+ efuse->clk = devm_clk_get(&pdev->dev, "bus_clk");
+ if (IS_ERR(efuse->clk))
+ return PTR_ERR(efuse->clk);
+
+ clk_rate = clk_get_rate(efuse->clk);
+ /*
+ * rd_adj and rd_strobe are 4 bit values
+ * bus clk period * (rd_adj + 1) > 6.5ns
+ * bus clk period * (rd_adj + 5 + rd_strobe) > 35ns
+ */
+ efuse->rd_adj = (((6500 * (clk_rate / 1000000)) / 1000000) + 1) - 1;
+ efuse->rd_strobe = ((((35000 * (clk_rate / 1000000)) / 1000000) + 1)
+ - 5 - efuse->rd_adj);
+
+ if ((efuse->rd_adj > 0x1F) || (efuse->rd_strobe > 0x1F)) {
+ dev_err(&pdev->dev, "Cannot set clock configuration\n");
+ return -EINVAL;
+ }
+ efuse->dev = dev;
+
+ jz4780_efuse_nvmem_config.size = 1024;
+ jz4780_efuse_nvmem_config.dev = &pdev->dev;
+ jz4780_efuse_nvmem_config.priv = efuse;
+
+ nvmem = nvmem_register(&jz4780_efuse_nvmem_config);
+ if (IS_ERR(nvmem))
+ return PTR_ERR(nvmem);
+
+ platform_set_drvdata(pdev, nvmem);
+
+ return 0;
+}
+
+static int jz4780_efuse_remove(struct platform_device *pdev)
+{
+ struct nvmem_device *nvmem = platform_get_drvdata(pdev);
+
+ return nvmem_unregister(nvmem);
+}
+
+static const struct of_device_id jz4780_efuse_match[] = {
+ { .compatible = "ingenic,jz4780-efuse" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, jz4780_efuse_match);
+
+static struct platform_driver jz4780_efuse_driver = {
+ .probe = jz4780_efuse_probe,
+ .remove = jz4780_efuse_remove,
+ .driver = {
+ .name = "jz4780-efuse",
+ .of_match_table = jz4780_efuse_match,
+ },
+};
+module_platform_driver(jz4780_efuse_driver);
+
+MODULE_AUTHOR("PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx>");
+MODULE_DESCRIPTION("Ingenic JZ4780 efuse driver");
+MODULE_LICENSE("GPL v2");
--
2.11.0