u-boot/drivers/misc/mxc_ocotp.c
Peng Fan 7296a02358 mxc: ocotp fix hole in shadow registers
There is a hole in shadow registers address map of size 0x100
between bank 5 and bank 6 on iMX6QP, iMX6DQ, iMX6SDL, iMX6SX and iMX6UL.
Bank 5 ends at 0x6F0 and Bank 6 starts at 0x800. When reading the fuses,
we should account for this hole in address space.

Similar hole exists between bank 14 and bank 15 of size
0x80 on iMX6QP, iMX6DQ, iMX6SDL and iMX6SX.
Note: iMX6SL has only 0-7 banks and there is no hole.
Note: iMX6UL doesn't have this one.

When reading, we use register offset, so need to account for holes
to get the correct address.
When writing, we use bank/word index, there is no need to account
for holes, always use bank/word index from fuse map.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
2015-09-02 15:39:51 +02:00

338 lines
8 KiB
C

/*
* (C) Copyright 2013 ADVANSEE
* Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
*
* Based on Dirk Behme's
* https://github.com/dirkbehme/u-boot-imx6/blob/28b17e9/drivers/misc/imx_otp.c,
* which is based on Freescale's
* http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/tree/drivers/misc/imx_otp.c?h=imx_v2009.08_1.1.0&id=9aa74e6,
* which is:
* Copyright (C) 2011 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <fuse.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/imx-regs.h>
#define BO_CTRL_WR_UNLOCK 16
#define BM_CTRL_WR_UNLOCK 0xffff0000
#define BV_CTRL_WR_UNLOCK_KEY 0x3e77
#define BM_CTRL_ERROR 0x00000200
#define BM_CTRL_BUSY 0x00000100
#define BO_CTRL_ADDR 0
#ifdef CONFIG_MX7
#define BM_CTRL_ADDR 0x0000000f
#define BM_CTRL_RELOAD 0x00000400
#else
#define BM_CTRL_ADDR 0x0000007f
#endif
#ifdef CONFIG_MX7
#define BO_TIMING_FSOURCE 12
#define BM_TIMING_FSOURCE 0x0007f000
#define BV_TIMING_FSOURCE_NS 1001
#define BO_TIMING_PROG 0
#define BM_TIMING_PROG 0x00000fff
#define BV_TIMING_PROG_US 10
#else
#define BO_TIMING_STROBE_READ 16
#define BM_TIMING_STROBE_READ 0x003f0000
#define BV_TIMING_STROBE_READ_NS 37
#define BO_TIMING_RELAX 12
#define BM_TIMING_RELAX 0x0000f000
#define BV_TIMING_RELAX_NS 17
#define BO_TIMING_STROBE_PROG 0
#define BM_TIMING_STROBE_PROG 0x00000fff
#define BV_TIMING_STROBE_PROG_US 10
#endif
#define BM_READ_CTRL_READ_FUSE 0x00000001
#define BF(value, field) (((value) << BO_##field) & BM_##field)
#define WRITE_POSTAMBLE_US 2
#if defined(CONFIG_MX6) || defined(CONFIG_VF610)
#define FUSE_BANK_SIZE 0x80
#ifdef CONFIG_MX6SL
#define FUSE_BANKS 8
#else
#define FUSE_BANKS 16
#endif
#elif defined CONFIG_MX7
#define FUSE_BANK_SIZE 0x40
#define FUSE_BANKS 16
#else
#error "Unsupported architecture\n"
#endif
#if defined(CONFIG_MX6)
#include <asm/arch/sys_proto.h>
/*
* There is a hole in shadow registers address map of size 0x100
* between bank 5 and bank 6 on iMX6QP, iMX6DQ, iMX6SDL, iMX6SX and iMX6UL.
* Bank 5 ends at 0x6F0 and Bank 6 starts at 0x800. When reading the fuses,
* we should account for this hole in address space.
*
* Similar hole exists between bank 14 and bank 15 of size
* 0x80 on iMX6QP, iMX6DQ, iMX6SDL and iMX6SX.
* Note: iMX6SL has only 0-7 banks and there is no hole.
* Note: iMX6UL doesn't have this one.
*
* This function is to covert user input to physical bank index.
* Only needed when read fuse, because we use register offset, so
* need to calculate real register offset.
* When write, no need to consider hole, always use the bank/word
* index from fuse map.
*/
u32 fuse_bank_physical(int index)
{
u32 phy_index;
if (is_cpu_type(MXC_CPU_MX6SL)) {
phy_index = index;
} else if (is_cpu_type(MXC_CPU_MX6UL)) {
if (index >= 6)
phy_index = fuse_bank_physical(5) + (index - 6) + 3;
else
phy_index = index;
} else {
if (index >= 15)
phy_index = fuse_bank_physical(14) + (index - 15) + 2;
else if (index >= 6)
phy_index = fuse_bank_physical(5) + (index - 6) + 3;
else
phy_index = index;
}
return phy_index;
}
#else
u32 fuse_bank_physical(int index)
{
return index;
}
#endif
static void wait_busy(struct ocotp_regs *regs, unsigned int delay_us)
{
while (readl(&regs->ctrl) & BM_CTRL_BUSY)
udelay(delay_us);
}
static void clear_error(struct ocotp_regs *regs)
{
writel(BM_CTRL_ERROR, &regs->ctrl_clr);
}
static int prepare_access(struct ocotp_regs **regs, u32 bank, u32 word,
int assert, const char *caller)
{
*regs = (struct ocotp_regs *)OCOTP_BASE_ADDR;
if (bank >= FUSE_BANKS ||
word >= ARRAY_SIZE((*regs)->bank[0].fuse_regs) >> 2 ||
!assert) {
printf("mxc_ocotp %s(): Invalid argument\n", caller);
return -EINVAL;
}
enable_ocotp_clk(1);
wait_busy(*regs, 1);
clear_error(*regs);
return 0;
}
static int finish_access(struct ocotp_regs *regs, const char *caller)
{
u32 err;
err = !!(readl(&regs->ctrl) & BM_CTRL_ERROR);
clear_error(regs);
if (err) {
printf("mxc_ocotp %s(): Access protect error\n", caller);
return -EIO;
}
return 0;
}
static int prepare_read(struct ocotp_regs **regs, u32 bank, u32 word, u32 *val,
const char *caller)
{
return prepare_access(regs, bank, word, val != NULL, caller);
}
int fuse_read(u32 bank, u32 word, u32 *val)
{
struct ocotp_regs *regs;
int ret;
u32 phy_bank;
ret = prepare_read(&regs, bank, word, val, __func__);
if (ret)
return ret;
phy_bank = fuse_bank_physical(bank);
*val = readl(&regs->bank[phy_bank].fuse_regs[word << 2]);
return finish_access(regs, __func__);
}
#ifdef CONFIG_MX7
static void set_timing(struct ocotp_regs *regs)
{
u32 ipg_clk;
u32 fsource, prog;
u32 timing;
ipg_clk = mxc_get_clock(MXC_IPG_CLK);
fsource = DIV_ROUND_UP((ipg_clk / 1000) * BV_TIMING_FSOURCE_NS,
+ 1000000) + 1;
prog = DIV_ROUND_CLOSEST(ipg_clk * BV_TIMING_PROG_US, 1000000) + 1;
timing = BF(fsource, TIMING_FSOURCE) | BF(prog, TIMING_PROG);
clrsetbits_le32(&regs->timing, BM_TIMING_FSOURCE | BM_TIMING_PROG,
timing);
}
#else
static void set_timing(struct ocotp_regs *regs)
{
u32 ipg_clk;
u32 relax, strobe_read, strobe_prog;
u32 timing;
ipg_clk = mxc_get_clock(MXC_IPG_CLK);
relax = DIV_ROUND_UP(ipg_clk * BV_TIMING_RELAX_NS, 1000000000) - 1;
strobe_read = DIV_ROUND_UP(ipg_clk * BV_TIMING_STROBE_READ_NS,
1000000000) + 2 * (relax + 1) - 1;
strobe_prog = DIV_ROUND_CLOSEST(ipg_clk * BV_TIMING_STROBE_PROG_US,
1000000) + 2 * (relax + 1) - 1;
timing = BF(strobe_read, TIMING_STROBE_READ) |
BF(relax, TIMING_RELAX) |
BF(strobe_prog, TIMING_STROBE_PROG);
clrsetbits_le32(&regs->timing, BM_TIMING_STROBE_READ | BM_TIMING_RELAX |
BM_TIMING_STROBE_PROG, timing);
}
#endif
static void setup_direct_access(struct ocotp_regs *regs, u32 bank, u32 word,
int write)
{
u32 wr_unlock = write ? BV_CTRL_WR_UNLOCK_KEY : 0;
#ifdef CONFIG_MX7
u32 addr = bank;
#else
u32 addr = bank << 3 | word;
#endif
set_timing(regs);
clrsetbits_le32(&regs->ctrl, BM_CTRL_WR_UNLOCK | BM_CTRL_ADDR,
BF(wr_unlock, CTRL_WR_UNLOCK) |
BF(addr, CTRL_ADDR));
}
int fuse_sense(u32 bank, u32 word, u32 *val)
{
struct ocotp_regs *regs;
int ret;
ret = prepare_read(&regs, bank, word, val, __func__);
if (ret)
return ret;
setup_direct_access(regs, bank, word, false);
writel(BM_READ_CTRL_READ_FUSE, &regs->read_ctrl);
wait_busy(regs, 1);
#ifdef CONFIG_MX7
*val = readl((&regs->read_fuse_data0) + (word << 2));
#else
*val = readl(&regs->read_fuse_data);
#endif
return finish_access(regs, __func__);
}
static int prepare_write(struct ocotp_regs **regs, u32 bank, u32 word,
const char *caller)
{
return prepare_access(regs, bank, word, true, caller);
}
int fuse_prog(u32 bank, u32 word, u32 val)
{
struct ocotp_regs *regs;
int ret;
ret = prepare_write(&regs, bank, word, __func__);
if (ret)
return ret;
setup_direct_access(regs, bank, word, true);
#ifdef CONFIG_MX7
switch (word) {
case 0:
writel(0, &regs->data1);
writel(0, &regs->data2);
writel(0, &regs->data3);
writel(val, &regs->data0);
break;
case 1:
writel(val, &regs->data1);
writel(0, &regs->data2);
writel(0, &regs->data3);
writel(0, &regs->data0);
break;
case 2:
writel(0, &regs->data1);
writel(val, &regs->data2);
writel(0, &regs->data3);
writel(0, &regs->data0);
break;
case 3:
writel(0, &regs->data1);
writel(0, &regs->data2);
writel(val, &regs->data3);
writel(0, &regs->data0);
break;
}
wait_busy(regs, BV_TIMING_PROG_US);
#else
writel(val, &regs->data);
wait_busy(regs, BV_TIMING_STROBE_PROG_US);
#endif
udelay(WRITE_POSTAMBLE_US);
return finish_access(regs, __func__);
}
int fuse_override(u32 bank, u32 word, u32 val)
{
struct ocotp_regs *regs;
int ret;
u32 phy_bank;
ret = prepare_write(&regs, bank, word, __func__);
if (ret)
return ret;
phy_bank = fuse_bank_physical(bank);
writel(val, &regs->bank[phy_bank].fuse_regs[word << 2]);
return finish_access(regs, __func__);
}