diff options
Diffstat (limited to 'drivers/char/fsl_otp.c')
| -rw-r--r-- | drivers/char/fsl_otp.c | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/drivers/char/fsl_otp.c b/drivers/char/fsl_otp.c new file mode 100644 index 00000000000..26ff68fcdaf --- /dev/null +++ b/drivers/char/fsl_otp.c @@ -0,0 +1,308 @@ +/* + * Freescale On-Chip OTP driver + * + * Copyright (C) 2010-2011 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/kobject.h> +#include <linux/string.h> +#include <linux/sysfs.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/fcntl.h> +#include <linux/mutex.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/fsl_devices.h> +#include <linux/of.h> +#include <linux/of_device.h> + +#include "fsl_otp.h" + +static DEFINE_MUTEX(otp_mutex); +static struct kobject *otp_kobj; +static struct attribute **attrs; +static struct kobj_attribute *kattr; +static struct attribute_group attr_group; +static struct mxc_otp_platform_data *otp_data; +static struct clk *otp_clk; + +static inline unsigned int get_reg_index(struct kobj_attribute *tmp) +{ + return tmp - kattr; +} + +static int otp_wait_busy(u32 flags) +{ + int count; + u32 c; + + for (count = 10000; count >= 0; count--) { + c = __raw_readl(REGS_OCOTP_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 otp_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + unsigned int index = get_reg_index(attr); + u32 value = 0; + + /* sanity check */ + if (index >= otp_data->fuse_num) + return 0; + + mutex_lock(&otp_mutex); + + if (otp_read_prepare(otp_data)) { + mutex_unlock(&otp_mutex); + return 0; + } + value = __raw_readl(REGS_OCOTP_BASE + HW_OCOTP_CUSTn(index)); + otp_read_post(otp_data); + + mutex_unlock(&otp_mutex); + return 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(REGS_OCOTP_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, REGS_OCOTP_BASE + HW_OCOTP_CTRL); + + /* init the data register */ + __raw_writel(data, REGS_OCOTP_BASE + HW_OCOTP_DATA); + otp_wait_busy(0); + + mdelay(2); /* Write Postamble */ + return 0; +} + +static ssize_t otp_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int index = get_reg_index(attr); + int value; + + /* sanity check */ + if (index >= otp_data->fuse_num) + return 0; + + sscanf(buf, "0x%x", &value); + + mutex_lock(&otp_mutex); + if (otp_write_prepare(otp_data)) { + mutex_unlock(&otp_mutex); + return 0; + } + otp_write_bits(index, value, 0x3e77); + otp_write_post(otp_data); + mutex_unlock(&otp_mutex); + return count; +} + +static void free_otp_attr(void) +{ + kfree(attrs); + attrs = NULL; + + kfree(kattr); + kattr = NULL; +} + +static int __init alloc_otp_attr(struct mxc_otp_platform_data *pdata) +{ + int i; + + otp_data = pdata; /* get private data */ + + /* The last one is NULL, which is used to detect the end */ + attrs = kzalloc((otp_data->fuse_num + 1) * sizeof(attrs[0]), + GFP_KERNEL); + kattr = kzalloc(otp_data->fuse_num * sizeof(struct kobj_attribute), + GFP_KERNEL); + + if (!attrs || !kattr) + goto error_out; + + for (i = 0; i < otp_data->fuse_num; i++) { + kattr[i].attr.name = pdata->fuse_name[i]; + kattr[i].attr.mode = 0600; + kattr[i].show = otp_show; + kattr[i].store = otp_store; + + attrs[i] = &kattr[i].attr; + } + memset(&attr_group, 0, sizeof(attr_group)); + attr_group.attrs = attrs; + return 0; + +error_out: + free_otp_attr(); + return -ENOMEM; +} + +static const struct of_device_id ocotp_dt_ids[]; + +static int __devinit fsl_otp_probe(struct platform_device *pdev) +{ + int retval; + struct mxc_otp_platform_data *pdata; + const struct of_device_id *of_id = + of_match_device(ocotp_dt_ids, &pdev->dev); + + pdata = of_id ? of_id->data : pdev->dev.platform_data; + if (pdata == NULL) + return -ENODEV; + + /* Enable clock */ + otp_clk = clk_get(&pdev->dev, "ocotp_clk"); + if (otp_clk) + clk_enable(otp_clk); + + retval = alloc_otp_attr(pdata); + if (retval) + return retval; + + retval = map_ocotp_addr(pdev); + if (retval) + goto error; + + otp_kobj = kobject_create_and_add("fsl_otp", NULL); + if (!otp_kobj) { + retval = -ENOMEM; + goto error; + } + + retval = sysfs_create_group(otp_kobj, &attr_group); + if (retval) + goto error; + + mutex_init(&otp_mutex); + dev_info(&pdev->dev, "initialized\n"); + return 0; +error: + kobject_put(otp_kobj); + otp_kobj = NULL; + free_otp_attr(); + unmap_ocotp_addr(); + return retval; +} + +static int otp_remove(struct platform_device *pdev) +{ + struct mxc_otp_platform_data *pdata; + + pdata = pdev->dev.platform_data; + if (pdata == NULL) + return -ENODEV; + + kobject_put(otp_kobj); + otp_kobj = NULL; + + free_otp_attr(); + unmap_ocotp_addr(); + + if (otp_clk) { + clk_disable(otp_clk); + clk_put(otp_clk); + } + + return 0; +} + +#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 char *imx6q_ocotp_fuse_names[16][8] = { + BANK(LOCK, CFG0, CFG1, CFG2, CFG3, CFG4, CFG5, CFG6), + BANK(MEM0, MEM1, MEM2, MEM3, MEM4, ANA0, ANA1, ANA2), + BANK(OTPMK0, SOTPMK1, 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), +}; + +enum { + IMX6Q_OCOTP, +}; + +static struct mxc_otp_platform_data ocotp_data[] = { + [IMX6Q_OCOTP] = { + .fuse_name = (char **)imx6q_ocotp_fuse_names, + .fuse_num = 16 * 8, + } +}; + +static const struct of_device_id ocotp_dt_ids[] = { + { .compatible = "fsl,imx6q-ocotp", .data = &ocotp_data[IMX6Q_OCOTP], }, + { /* sentinel */ } +}; + +static struct platform_driver ocotp_driver = { + .probe = fsl_otp_probe, + .remove = otp_remove, + .driver = { + .name = "imx-ocotp", + .owner = THIS_MODULE, + .of_match_table = ocotp_dt_ids, + }, +}; + +static int __init fsl_otp_init(void) +{ + return platform_driver_register(&ocotp_driver); +} + +static void __exit fsl_otp_exit(void) +{ + platform_driver_unregister(&ocotp_driver); +} +module_init(fsl_otp_init); +module_exit(fsl_otp_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Huang Shijie <b32955@freescale.com>"); +MODULE_DESCRIPTION("Common driver for OTP controller"); |