--- /dev/null
+/*
+ * Freescale On-Chip OTP driver
+ *
+ * Copyright (C) 2010-2013 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kobject.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+
+#define HW_OCOTP_CTRL 0x00000000
+#define HW_OCOTP_CTRL_SET 0x00000004
+#define BP_OCOTP_CTRL_WR_UNLOCK 16
+#define BM_OCOTP_CTRL_WR_UNLOCK 0xFFFF0000
+#define BM_OCOTP_CTRL_RELOAD_SHADOWS 0x00000400
+#define BM_OCOTP_CTRL_ERROR 0x00000200
+#define BM_OCOTP_CTRL_BUSY 0x00000100
+#define BP_OCOTP_CTRL_ADDR 0
+#define BM_OCOTP_CTRL_ADDR 0x0000007F
+
+#define HW_OCOTP_TIMING 0x00000010
+#define BP_OCOTP_TIMING_STROBE_READ 16
+#define BM_OCOTP_TIMING_STROBE_READ 0x003F0000
+#define BP_OCOTP_TIMING_RELAX 12
+#define BM_OCOTP_TIMING_RELAX 0x0000F000
+#define BP_OCOTP_TIMING_STROBE_PROG 0
+#define BM_OCOTP_TIMING_STROBE_PROG 0x00000FFF
+
+#define HW_OCOTP_DATA 0x00000020
+
+#define HW_OCOTP_CUST_N(n) (0x00000400 + (n) * 0x10)
+#define BF(value, field) (((value) << BP_##field) & BM_##field)
+
+#define DEF_RELAX 20 /* > 16.5ns */
+
+#define BANK(a, b, c, d, e, f, g, h) { \
+ "HW_OCOTP_"#a, "HW_OCOTP_"#b, "HW_OCOTP_"#c, "HW_OCOTP_"#d, \
+ "HW_OCOTP_"#e, "HW_OCOTP_"#f, "HW_OCOTP_"#g, "HW_OCOTP_"#h, \
+}
+
+static const char *imx6q_otp_desc[16][8] = {
+ BANK(LOCK, CFG0, CFG1, CFG2, CFG3, CFG4, CFG5, CFG6),
+ BANK(MEM0, MEM1, MEM2, MEM3, MEM4, ANA0, ANA1, ANA2),
+ BANK(OTPMK0, OTPMK1, OTPMK2, OTPMK3, OTPMK4, OTPMK5, OTPMK6, OTPMK7),
+ BANK(SRK0, SRK1, SRK2, SRK3, SRK4, SRK5, SRK6, SRK7),
+ BANK(RESP0, HSJC_RESP1, MAC0, MAC1, HDCP_KSV0, HDCP_KSV1, GP1, GP2),
+ BANK(DTCP_KEY0, DTCP_KEY1, DTCP_KEY2, DTCP_KEY3, DTCP_KEY4, MISC_CONF, FIELD_RETURN, SRK_REVOKE),
+ BANK(HDCP_KEY0, HDCP_KEY1, HDCP_KEY2, HDCP_KEY3, HDCP_KEY4, HDCP_KEY5, HDCP_KEY6, HDCP_KEY7),
+ BANK(HDCP_KEY8, HDCP_KEY9, HDCP_KEY10, HDCP_KEY11, HDCP_KEY12, HDCP_KEY13, HDCP_KEY14, HDCP_KEY15),
+ BANK(HDCP_KEY16, HDCP_KEY17, HDCP_KEY18, HDCP_KEY19, HDCP_KEY20, HDCP_KEY21, HDCP_KEY22, HDCP_KEY23),
+ BANK(HDCP_KEY24, HDCP_KEY25, HDCP_KEY26, HDCP_KEY27, HDCP_KEY28, HDCP_KEY29, HDCP_KEY30, HDCP_KEY31),
+ BANK(HDCP_KEY32, HDCP_KEY33, HDCP_KEY34, HDCP_KEY35, HDCP_KEY36, HDCP_KEY37, HDCP_KEY38, HDCP_KEY39),
+ BANK(HDCP_KEY40, HDCP_KEY41, HDCP_KEY42, HDCP_KEY43, HDCP_KEY44, HDCP_KEY45, HDCP_KEY46, HDCP_KEY47),
+ BANK(HDCP_KEY48, HDCP_KEY49, HDCP_KEY50, HDCP_KEY51, HDCP_KEY52, HDCP_KEY53, HDCP_KEY54, HDCP_KEY55),
+ BANK(HDCP_KEY56, HDCP_KEY57, HDCP_KEY58, HDCP_KEY59, HDCP_KEY60, HDCP_KEY61, HDCP_KEY62, HDCP_KEY63),
+ BANK(HDCP_KEY64, HDCP_KEY65, HDCP_KEY66, HDCP_KEY67, HDCP_KEY68, HDCP_KEY69, HDCP_KEY70, HDCP_KEY71),
+ BANK(CRC0, CRC1, CRC2, CRC3, CRC4, CRC5, CRC6, CRC7),
+};
+
+static DEFINE_MUTEX(otp_mutex);
+static void __iomem *otp_base;
+static struct clk *otp_clk;
+struct kobject *otp_kobj;
+struct kobj_attribute *otp_kattr;
+struct attribute_group *otp_attr_group;
+
+static void set_otp_timing(void)
+{
+ unsigned long clk_rate = 0;
+ unsigned long strobe_read, relex, strobe_prog;
+ u32 timing = 0;
+
+ clk_rate = clk_get_rate(otp_clk);
+
+ /* do optimization for too many zeros */
+ relex = clk_rate / (1000000000 / DEF_RELAX) - 1;
+ strobe_prog = clk_rate / (1000000000 / 10000) + 2 * (DEF_RELAX + 1) - 1;
+ strobe_read = clk_rate / (1000000000 / 40) + 2 * (DEF_RELAX + 1) - 1;
+
+ timing = BF(relex, OCOTP_TIMING_RELAX);
+ timing |= BF(strobe_read, OCOTP_TIMING_STROBE_READ);
+ timing |= BF(strobe_prog, OCOTP_TIMING_STROBE_PROG);
+
+ __raw_writel(timing, otp_base + HW_OCOTP_TIMING);
+}
+
+static int otp_wait_busy(u32 flags)
+{
+ int count;
+ u32 c;
+
+ for (count = 10000; count >= 0; count--) {
+ c = __raw_readl(otp_base + HW_OCOTP_CTRL);
+ if (!(c & (BM_OCOTP_CTRL_BUSY | BM_OCOTP_CTRL_ERROR | flags)))
+ break;
+ cpu_relax();
+ }
+
+ if (count < 0)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static ssize_t fsl_otp_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
+{
+ unsigned int index = attr - otp_kattr;
+ u32 value = 0;
+ int ret;
+
+ ret = clk_prepare_enable(otp_clk);
+ if (ret)
+ return 0;
+
+ mutex_lock(&otp_mutex);
+
+ set_otp_timing();
+ ret = otp_wait_busy(0);
+ if (ret)
+ goto out;
+
+ value = __raw_readl(otp_base + HW_OCOTP_CUST_N(index));
+
+out:
+ mutex_unlock(&otp_mutex);
+ clk_disable_unprepare(otp_clk);
+ return ret ? 0 : sprintf(buf, "0x%x\n", value);
+}
+
+static int otp_write_bits(int addr, u32 data, u32 magic)
+{
+ u32 c; /* for control register */
+
+ /* init the control register */
+ c = __raw_readl(otp_base + HW_OCOTP_CTRL);
+ c &= ~BM_OCOTP_CTRL_ADDR;
+ c |= BF(addr, OCOTP_CTRL_ADDR);
+ c |= BF(magic, OCOTP_CTRL_WR_UNLOCK);
+ __raw_writel(c, otp_base + HW_OCOTP_CTRL);
+
+ /* init the data register */
+ __raw_writel(data, otp_base + HW_OCOTP_DATA);
+ otp_wait_busy(0);
+
+ mdelay(2); /* Write Postamble */
+
+ return 0;
+}
+
+static ssize_t fsl_otp_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned int index = attr - otp_kattr;
+ u32 value;
+ int ret;
+
+ sscanf(buf, "0x%x", &value);
+
+ ret = clk_prepare_enable(otp_clk);
+ if (ret)
+ return 0;
+
+ mutex_lock(&otp_mutex);
+
+ set_otp_timing();
+ ret = otp_wait_busy(0);
+ if (ret)
+ goto out;
+
+ otp_write_bits(index, value, 0x3e77);
+
+ /* Reload all the shadow registers */
+ __raw_writel(BM_OCOTP_CTRL_RELOAD_SHADOWS,
+ otp_base + HW_OCOTP_CTRL_SET);
+ udelay(1);
+ otp_wait_busy(BM_OCOTP_CTRL_RELOAD_SHADOWS);
+
+out:
+ mutex_unlock(&otp_mutex);
+ clk_disable_unprepare(otp_clk);
+ return ret ? 0 : count;
+}
+
+static int fsl_otp_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct attribute **attrs;
+ const char **desc;
+ int i, num;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ otp_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(otp_base)) {
+ ret = PTR_ERR(otp_base);
+ dev_err(&pdev->dev, "failed to ioremap resource: %d\n", ret);
+ return ret;
+ }
+
+ otp_clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(otp_clk)) {
+ ret = PTR_ERR(otp_clk);
+ dev_err(&pdev->dev, "failed to get clock: %d\n", ret);
+ return ret;
+ }
+
+ desc = (const char **) imx6q_otp_desc;
+ num = sizeof(imx6q_otp_desc) / sizeof(void *);
+
+ /* The last one is NULL, which is used to detect the end */
+ attrs = devm_kzalloc(&pdev->dev, (num + 1) * sizeof(*attrs),
+ GFP_KERNEL);
+ otp_kattr = devm_kzalloc(&pdev->dev, num * sizeof(*otp_kattr),
+ GFP_KERNEL);
+ otp_attr_group = devm_kzalloc(&pdev->dev, sizeof(*otp_attr_group),
+ GFP_KERNEL);
+ if (!attrs || !otp_kattr || !otp_attr_group)
+ return -ENOMEM;
+
+ for (i = 0; i < num; i++) {
+ sysfs_attr_init(&otp_kattr[i].attr);
+ otp_kattr[i].attr.name = desc[i];
+ otp_kattr[i].attr.mode = 0600;
+ otp_kattr[i].show = fsl_otp_show;
+ otp_kattr[i].store = fsl_otp_store;
+ attrs[i] = &otp_kattr[i].attr;
+ }
+ otp_attr_group->attrs = attrs;
+
+ otp_kobj = kobject_create_and_add("fsl_otp", NULL);
+ if (!otp_kobj) {
+ dev_err(&pdev->dev, "failed to add kobject\n");
+ return -ENOMEM;
+ }
+
+ ret = sysfs_create_group(otp_kobj, otp_attr_group);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
+ kobject_put(otp_kobj);
+ return ret;
+ }
+
+ mutex_init(&otp_mutex);
+
+ return 0;
+}
+
+static int fsl_otp_remove(struct platform_device *pdev)
+{
+ sysfs_remove_group(otp_kobj, otp_attr_group);
+ kobject_put(otp_kobj);
+
+ return 0;
+}
+
+static const struct of_device_id fsl_otp_dt_ids[] = {
+ { .compatible = "fsl,imx6q-ocotp", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, fsl_otp_dt_ids);
+
+static struct platform_driver fsl_otp_driver = {
+ .driver = {
+ .name = "imx-ocotp",
+ .owner = THIS_MODULE,
+ .of_match_table = fsl_otp_dt_ids,
+ },
+ .probe = fsl_otp_probe,
+ .remove = fsl_otp_remove,
+};
+module_platform_driver(fsl_otp_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Huang Shijie <b32955@freescale.com>");
+MODULE_DESCRIPTION("Freescale i.MX OCOTP driver");
projects / karo-tx-linux.git / commitdiff