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linux/drivers/net/wireless/brcm80211/brcmsmac/otp.c

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/*
* Copyright (c) 2010 Broadcom Corporation
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <brcm_hw_ids.h>
#include <chipcommon.h>
#include "aiutils.h"
#include "otp.h"
#define OTPS_GUP_MASK 0x00000f00
#define OTPS_GUP_SHIFT 8
/* h/w subregion is programmed */
#define OTPS_GUP_HW 0x00000100
/* s/w subregion is programmed */
#define OTPS_GUP_SW 0x00000200
/* chipid/pkgopt subregion is programmed */
#define OTPS_GUP_CI 0x00000400
/* fuse subregion is programmed */
#define OTPS_GUP_FUSE 0x00000800
/* Fields in otpprog in rev >= 21 */
#define OTPP_COL_MASK 0x000000ff
#define OTPP_COL_SHIFT 0
#define OTPP_ROW_MASK 0x0000ff00
#define OTPP_ROW_SHIFT 8
#define OTPP_OC_MASK 0x0f000000
#define OTPP_OC_SHIFT 24
#define OTPP_READERR 0x10000000
#define OTPP_VALUE_MASK 0x20000000
#define OTPP_VALUE_SHIFT 29
#define OTPP_START_BUSY 0x80000000
#define OTPP_READ 0x40000000
/* Opcodes for OTPP_OC field */
#define OTPPOC_READ 0
#define OTPPOC_BIT_PROG 1
#define OTPPOC_VERIFY 3
#define OTPPOC_INIT 4
#define OTPPOC_SET 5
#define OTPPOC_RESET 6
#define OTPPOC_OCST 7
#define OTPPOC_ROW_LOCK 8
#define OTPPOC_PRESCN_TEST 9
#define OTPTYPE_IPX(ccrev) ((ccrev) == 21 || (ccrev) >= 23)
#define OTPP_TRIES 10000000 /* # of tries for OTPP */
#define MAXNUMRDES 9 /* Maximum OTP redundancy entries */
/* Fixed size subregions sizes in words */
#define OTPGU_CI_SZ 2
struct otpinfo;
/* OTP function struct */
struct otp_fn_s {
int (*init)(struct si_pub *sih, struct otpinfo *oi);
int (*read_region)(struct otpinfo *oi, int region, u16 *data,
uint *wlen);
};
struct otpinfo {
uint ccrev; /* chipc revision */
const struct otp_fn_s *fn; /* OTP functions */
struct si_pub *sih; /* Saved sb handle */
/* IPX OTP section */
u16 wsize; /* Size of otp in words */
u16 rows; /* Geometry */
u16 cols; /* Geometry */
u32 status; /* Flag bits (lock/prog/rv).
* (Reflected only when OTP is power cycled)
*/
u16 hwbase; /* hardware subregion offset */
u16 hwlim; /* hardware subregion boundary */
u16 swbase; /* software subregion offset */
u16 swlim; /* software subregion boundary */
u16 fbase; /* fuse subregion offset */
u16 flim; /* fuse subregion boundary */
int otpgu_base; /* offset to General Use Region */
};
/* OTP layout */
/* CC revs 21, 24 and 27 OTP General Use Region word offset */
#define REVA4_OTPGU_BASE 12
/* CC revs 23, 25, 26, 28 and above OTP General Use Region word offset */
#define REVB8_OTPGU_BASE 20
/* CC rev 36 OTP General Use Region word offset */
#define REV36_OTPGU_BASE 12
/* Subregion word offsets in General Use region */
#define OTPGU_HSB_OFF 0
#define OTPGU_SFB_OFF 1
#define OTPGU_CI_OFF 2
#define OTPGU_P_OFF 3
#define OTPGU_SROM_OFF 4
/* Flag bit offsets in General Use region */
#define OTPGU_HWP_OFF 60
#define OTPGU_SWP_OFF 61
#define OTPGU_CIP_OFF 62
#define OTPGU_FUSEP_OFF 63
#define OTPGU_CIP_MSK 0x4000
#define OTPGU_P_MSK 0xf000
#define OTPGU_P_SHIFT (OTPGU_HWP_OFF % 16)
/* OTP Size */
#define OTP_SZ_FU_324 ((roundup(324, 8))/8) /* 324 bits */
#define OTP_SZ_FU_288 (288/8) /* 288 bits */
#define OTP_SZ_FU_216 (216/8) /* 216 bits */
#define OTP_SZ_FU_72 (72/8) /* 72 bits */
#define OTP_SZ_CHECKSUM (16/8) /* 16 bits */
#define OTP4315_SWREG_SZ 178 /* 178 bytes */
#define OTP_SZ_FU_144 (144/8) /* 144 bits */
static u16
ipxotp_otpr(struct otpinfo *oi, struct chipcregs __iomem *cc, uint wn)
{
return R_REG(&cc->sromotp[wn]);
}
/*
* Calculate max HW/SW region byte size by subtracting fuse region
* and checksum size, osizew is oi->wsize (OTP size - GU size) in words
*/
static int ipxotp_max_rgnsz(struct si_pub *sih, int osizew)
{
int ret = 0;
switch (sih->chip) {
case BCM43224_CHIP_ID:
case BCM43225_CHIP_ID:
ret = osizew * 2 - OTP_SZ_FU_72 - OTP_SZ_CHECKSUM;
break;
case BCM4313_CHIP_ID:
ret = osizew * 2 - OTP_SZ_FU_72 - OTP_SZ_CHECKSUM;
break;
default:
break; /* Don't know about this chip */
}
return ret;
}
static void _ipxotp_init(struct otpinfo *oi, struct chipcregs __iomem *cc)
{
uint k;
u32 otpp, st;
/*
* record word offset of General Use Region
* for various chipcommon revs
*/
if (oi->sih->ccrev == 21 || oi->sih->ccrev == 24
|| oi->sih->ccrev == 27) {
oi->otpgu_base = REVA4_OTPGU_BASE;
} else if (oi->sih->ccrev == 36) {
/*
* OTP size greater than equal to 2KB (128 words),
* otpgu_base is similar to rev23
*/
if (oi->wsize >= 128)
oi->otpgu_base = REVB8_OTPGU_BASE;
else
oi->otpgu_base = REV36_OTPGU_BASE;
} else if (oi->sih->ccrev == 23 || oi->sih->ccrev >= 25) {
oi->otpgu_base = REVB8_OTPGU_BASE;
}
/* First issue an init command so the status is up to date */
otpp =
OTPP_START_BUSY | ((OTPPOC_INIT << OTPP_OC_SHIFT) & OTPP_OC_MASK);
W_REG(&cc->otpprog, otpp);
for (k = 0;
((st = R_REG(&cc->otpprog)) & OTPP_START_BUSY)
&& (k < OTPP_TRIES); k++)
;
if (k >= OTPP_TRIES)
return;
/* Read OTP lock bits and subregion programmed indication bits */
oi->status = R_REG(&cc->otpstatus);
if ((oi->sih->chip == BCM43224_CHIP_ID)
|| (oi->sih->chip == BCM43225_CHIP_ID)) {
u32 p_bits;
p_bits =
(ipxotp_otpr(oi, cc, oi->otpgu_base + OTPGU_P_OFF) &
OTPGU_P_MSK)
>> OTPGU_P_SHIFT;
oi->status |= (p_bits << OTPS_GUP_SHIFT);
}
/*
* h/w region base and fuse region limit are fixed to
* the top and the bottom of the general use region.
* Everything else can be flexible.
*/
oi->hwbase = oi->otpgu_base + OTPGU_SROM_OFF;
oi->hwlim = oi->wsize;
if (oi->status & OTPS_GUP_HW) {
oi->hwlim =
ipxotp_otpr(oi, cc, oi->otpgu_base + OTPGU_HSB_OFF) / 16;
oi->swbase = oi->hwlim;
} else
oi->swbase = oi->hwbase;
/* subtract fuse and checksum from beginning */
oi->swlim = ipxotp_max_rgnsz(oi->sih, oi->wsize) / 2;
if (oi->status & OTPS_GUP_SW) {
oi->swlim =
ipxotp_otpr(oi, cc, oi->otpgu_base + OTPGU_SFB_OFF) / 16;
oi->fbase = oi->swlim;
} else
oi->fbase = oi->swbase;
oi->flim = oi->wsize;
}
static int ipxotp_init(struct si_pub *sih, struct otpinfo *oi)
{
uint idx;
struct chipcregs __iomem *cc;
/* Make sure we're running IPX OTP */
if (!OTPTYPE_IPX(sih->ccrev))
return -EBADE;
/* Make sure OTP is not disabled */
if (ai_is_otp_disabled(sih))
return -EBADE;
/* Check for otp size */
switch ((sih->cccaps & CC_CAP_OTPSIZE) >> CC_CAP_OTPSIZE_SHIFT) {
case 0:
/* Nothing there */
return -EBADE;
case 1: /* 32x64 */
oi->rows = 32;
oi->cols = 64;
oi->wsize = 128;
break;
case 2: /* 64x64 */
oi->rows = 64;
oi->cols = 64;
oi->wsize = 256;
break;
case 5: /* 96x64 */
oi->rows = 96;
oi->cols = 64;
oi->wsize = 384;
break;
case 7: /* 16x64 *//* 1024 bits */
oi->rows = 16;
oi->cols = 64;
oi->wsize = 64;
break;
default:
/* Don't know the geometry */
return -EBADE;
}
/* Retrieve OTP region info */
idx = ai_coreidx(sih);
cc = ai_setcoreidx(sih, SI_CC_IDX);
_ipxotp_init(oi, cc);
ai_setcoreidx(sih, idx);
return 0;
}
static int
ipxotp_read_region(struct otpinfo *oi, int region, u16 *data, uint *wlen)
{
uint idx;
struct chipcregs __iomem *cc;
uint base, i, sz;
/* Validate region selection */
switch (region) {
case OTP_HW_RGN:
sz = (uint) oi->hwlim - oi->hwbase;
if (!(oi->status & OTPS_GUP_HW)) {
*wlen = sz;
return -ENODATA;
}
if (*wlen < sz) {
*wlen = sz;
return -EOVERFLOW;
}
base = oi->hwbase;
break;
case OTP_SW_RGN:
sz = ((uint) oi->swlim - oi->swbase);
if (!(oi->status & OTPS_GUP_SW)) {
*wlen = sz;
return -ENODATA;
}
if (*wlen < sz) {
*wlen = sz;
return -EOVERFLOW;
}
base = oi->swbase;
break;
case OTP_CI_RGN:
sz = OTPGU_CI_SZ;
if (!(oi->status & OTPS_GUP_CI)) {
*wlen = sz;
return -ENODATA;
}
if (*wlen < sz) {
*wlen = sz;
return -EOVERFLOW;
}
base = oi->otpgu_base + OTPGU_CI_OFF;
break;
case OTP_FUSE_RGN:
sz = (uint) oi->flim - oi->fbase;
if (!(oi->status & OTPS_GUP_FUSE)) {
*wlen = sz;
return -ENODATA;
}
if (*wlen < sz) {
*wlen = sz;
return -EOVERFLOW;
}
base = oi->fbase;
break;
case OTP_ALL_RGN:
sz = ((uint) oi->flim - oi->hwbase);
if (!(oi->status & (OTPS_GUP_HW | OTPS_GUP_SW))) {
*wlen = sz;
return -ENODATA;
}
if (*wlen < sz) {
*wlen = sz;
return -EOVERFLOW;
}
base = oi->hwbase;
break;
default:
return -EINVAL;
}
idx = ai_coreidx(oi->sih);
cc = ai_setcoreidx(oi->sih, SI_CC_IDX);
/* Read the data */
for (i = 0; i < sz; i++)
data[i] = ipxotp_otpr(oi, cc, base + i);
ai_setcoreidx(oi->sih, idx);
*wlen = sz;
return 0;
}
static const struct otp_fn_s ipxotp_fn = {
(int (*)(struct si_pub *, struct otpinfo *)) ipxotp_init,
(int (*)(struct otpinfo *, int, u16 *, uint *)) ipxotp_read_region,
};
static int otp_init(struct si_pub *sih, struct otpinfo *oi)
{
int ret;
memset(oi, 0, sizeof(struct otpinfo));
oi->ccrev = sih->ccrev;
if (OTPTYPE_IPX(oi->ccrev))
oi->fn = &ipxotp_fn;
if (oi->fn == NULL)
return -EBADE;
oi->sih = sih;
ret = (oi->fn->init) (sih, oi);
return ret;
}
int
otp_read_region(struct si_pub *sih, int region, u16 *data, uint *wlen) {
struct otpinfo otpinfo;
struct otpinfo *oi = &otpinfo;
int err = 0;
if (ai_is_otp_disabled(sih)) {
err = -EPERM;
goto out;
}
err = otp_init(sih, oi);
if (err)
goto out;
err = ((oi)->fn->read_region)(oi, region, data, wlen);
out:
return err;
}
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