u-boot/drivers/net/fsl-mc/dpio/qbman_sys.h
Prabhakar Kushwaha b576d325ac driver: net: fsl-mc: Check NULL before pointer dereference
NULL pointer should be checked before any dereference.  This patch
move memest after the NULL pointer check.

Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
Reported-by: Jose Rivera <german.rivera@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: York Sun <york.sun@nxp.com>
2016-03-29 08:46:01 -07:00

290 lines
8.3 KiB
C

/*
* Copyright (C) 2014 Freescale Semiconductor
*
* SPDX-License-Identifier: GPL-2.0+
*/
/* qbman_sys_decl.h and qbman_sys.h are the two platform-specific files in the
* driver. They are only included via qbman_private.h, which is itself a
* platform-independent file and is included by all the other driver source.
*
* qbman_sys_decl.h is included prior to all other declarations and logic, and
* it exists to provide compatibility with any linux interfaces our
* single-source driver code is dependent on (eg. kmalloc). Ie. this file
* provides linux compatibility.
*
* This qbman_sys.h header, on the other hand, is included *after* any common
* and platform-neutral declarations and logic in qbman_private.h, and exists to
* implement any platform-specific logic of the qbman driver itself. Ie. it is
* *not* to provide linux compatibility.
*/
/* Trace the 3 different classes of read/write access to QBMan. #undef as
* required. */
#undef QBMAN_CCSR_TRACE
#undef QBMAN_CINH_TRACE
#undef QBMAN_CENA_TRACE
/* Temporarily define this to get around the fact that cache enabled mapping is
* not working right now. Will remove this after uboot could map the cache
* enabled portal memory.
*/
#define QBMAN_CINH_ONLY
static inline void word_copy(void *d, const void *s, unsigned int cnt)
{
uint32_t *dd = d;
const uint32_t *ss = s;
while (cnt--)
*(dd++) = *(ss++);
}
/* Currently, the CENA support code expects each 32-bit word to be written in
* host order, and these are converted to hardware (little-endian) order on
* command submission. However, 64-bit quantities are must be written (and read)
* as two 32-bit words with the least-significant word first, irrespective of
* host endianness. */
static inline void u64_to_le32_copy(void *d, const uint64_t *s,
unsigned int cnt)
{
uint32_t *dd = d;
const uint32_t *ss = (const uint32_t *)s;
while (cnt--) {
/* TBD: the toolchain was choking on the use of 64-bit types up
* until recently so this works entirely with 32-bit variables.
* When 64-bit types become usable again, investigate better
* ways of doing this. */
#if defined(__BIG_ENDIAN)
*(dd++) = ss[1];
*(dd++) = ss[0];
ss += 2;
#else
*(dd++) = *(ss++);
*(dd++) = *(ss++);
#endif
}
}
static inline void u64_from_le32_copy(uint64_t *d, const void *s,
unsigned int cnt)
{
const uint32_t *ss = s;
uint32_t *dd = (uint32_t *)d;
while (cnt--) {
#if defined(__BIG_ENDIAN)
dd[1] = *(ss++);
dd[0] = *(ss++);
dd += 2;
#else
*(dd++) = *(ss++);
*(dd++) = *(ss++);
#endif
}
}
/* Convert a host-native 32bit value into little endian */
#if defined(__BIG_ENDIAN)
static inline uint32_t make_le32(uint32_t val)
{
return ((val & 0xff) << 24) | ((val & 0xff00) << 8) |
((val & 0xff0000) >> 8) | ((val & 0xff000000) >> 24);
}
#else
#define make_le32(val) (val)
#endif
static inline void make_le32_n(uint32_t *val, unsigned int num)
{
while (num--) {
*val = make_le32(*val);
val++;
}
}
/******************/
/* Portal access */
/******************/
struct qbman_swp_sys {
/* On GPP, the sys support for qbman_swp is here. The CENA region isi
* not an mmap() of the real portal registers, but an allocated
* place-holder, because the actual writes/reads to/from the portal are
* marshalled from these allocated areas using QBMan's "MC access
* registers". CINH accesses are atomic so there's no need for a
* place-holder. */
void *cena;
void __iomem *addr_cena;
void __iomem *addr_cinh;
};
/* P_OFFSET is (ACCESS_CMD,0,12) - offset within the portal
* C is (ACCESS_CMD,12,1) - is inhibited? (0==CENA, 1==CINH)
* SWP_IDX is (ACCESS_CMD,16,10) - Software portal index
* P is (ACCESS_CMD,28,1) - (0==special portal, 1==any portal)
* T is (ACCESS_CMD,29,1) - Command type (0==READ, 1==WRITE)
* E is (ACCESS_CMD,31,1) - Command execute (1 to issue, poll for 0==complete)
*/
static inline void qbman_cinh_write(struct qbman_swp_sys *s, uint32_t offset,
uint32_t val)
{
__raw_writel(val, s->addr_cinh + offset);
#ifdef QBMAN_CINH_TRACE
pr_info("qbman_cinh_write(%p:0x%03x) 0x%08x\n",
s->addr_cinh, offset, val);
#endif
}
static inline uint32_t qbman_cinh_read(struct qbman_swp_sys *s, uint32_t offset)
{
uint32_t reg = __raw_readl(s->addr_cinh + offset);
#ifdef QBMAN_CINH_TRACE
pr_info("qbman_cinh_read(%p:0x%03x) 0x%08x\n",
s->addr_cinh, offset, reg);
#endif
return reg;
}
static inline void *qbman_cena_write_start(struct qbman_swp_sys *s,
uint32_t offset)
{
void *shadow = s->cena + offset;
#ifdef QBMAN_CENA_TRACE
pr_info("qbman_cena_write_start(%p:0x%03x) %p\n",
s->addr_cena, offset, shadow);
#endif
BUG_ON(offset & 63);
dcbz(shadow);
return shadow;
}
static inline void qbman_cena_write_complete(struct qbman_swp_sys *s,
uint32_t offset, void *cmd)
{
const uint32_t *shadow = cmd;
int loop;
#ifdef QBMAN_CENA_TRACE
pr_info("qbman_cena_write_complete(%p:0x%03x) %p\n",
s->addr_cena, offset, shadow);
hexdump(cmd, 64);
#endif
for (loop = 15; loop >= 0; loop--)
#ifdef QBMAN_CINH_ONLY
__raw_writel(shadow[loop], s->addr_cinh +
offset + loop * 4);
#else
__raw_writel(shadow[loop], s->addr_cena +
offset + loop * 4);
#endif
}
static inline void *qbman_cena_read(struct qbman_swp_sys *s, uint32_t offset)
{
uint32_t *shadow = s->cena + offset;
unsigned int loop;
#ifdef QBMAN_CENA_TRACE
pr_info("qbman_cena_read(%p:0x%03x) %p\n",
s->addr_cena, offset, shadow);
#endif
for (loop = 0; loop < 16; loop++)
#ifdef QBMAN_CINH_ONLY
shadow[loop] = __raw_readl(s->addr_cinh + offset
+ loop * 4);
#else
shadow[loop] = __raw_readl(s->addr_cena + offset
+ loop * 4);
#endif
#ifdef QBMAN_CENA_TRACE
hexdump(shadow, 64);
#endif
return shadow;
}
static inline void qbman_cena_invalidate_prefetch(struct qbman_swp_sys *s,
uint32_t offset)
{
}
/******************/
/* Portal support */
/******************/
/* The SWP_CFG portal register is special, in that it is used by the
* platform-specific code rather than the platform-independent code in
* qbman_portal.c. So use of it is declared locally here. */
#define QBMAN_CINH_SWP_CFG 0xd00
/* For MC portal use, we always configure with
* DQRR_MF is (SWP_CFG,20,3) - DQRR max fill (<- 0x4)
* EST is (SWP_CFG,16,3) - EQCR_CI stashing threshold (<- 0x0)
* RPM is (SWP_CFG,12,2) - RCR production notification mode (<- 0x3)
* DCM is (SWP_CFG,10,2) - DQRR consumption notification mode (<- 0x2)
* EPM is (SWP_CFG,8,2) - EQCR production notification mode (<- 0x3)
* SD is (SWP_CFG,5,1) - memory stashing drop enable (<- FALSE)
* SP is (SWP_CFG,4,1) - memory stashing priority (<- TRUE)
* SE is (SWP_CFG,3,1) - memory stashing enable (<- 0x0)
* DP is (SWP_CFG,2,1) - dequeue stashing priority (<- TRUE)
* DE is (SWP_CFG,1,1) - dequeue stashing enable (<- 0x0)
* EP is (SWP_CFG,0,1) - EQCR_CI stashing priority (<- FALSE)
*/
static inline uint32_t qbman_set_swp_cfg(uint8_t max_fill, uint8_t wn,
uint8_t est, uint8_t rpm, uint8_t dcm,
uint8_t epm, int sd, int sp, int se,
int dp, int de, int ep)
{
uint32_t reg;
reg = e32_uint8_t(20, 3, max_fill) | e32_uint8_t(16, 3, est) |
e32_uint8_t(12, 2, rpm) | e32_uint8_t(10, 2, dcm) |
e32_uint8_t(8, 2, epm) | e32_int(5, 1, sd) |
e32_int(4, 1, sp) | e32_int(3, 1, se) | e32_int(2, 1, dp) |
e32_int(1, 1, de) | e32_int(0, 1, ep) | e32_uint8_t(14, 1, wn);
return reg;
}
static inline int qbman_swp_sys_init(struct qbman_swp_sys *s,
const struct qbman_swp_desc *d)
{
uint32_t reg;
s->addr_cena = d->cena_bar;
s->addr_cinh = d->cinh_bar;
s->cena = (void *)valloc(CONFIG_SYS_PAGE_SIZE);
if (!s->cena) {
printf("Could not allocate page for cena shadow\n");
return -1;
}
memset((void *)s->cena, 0x00, CONFIG_SYS_PAGE_SIZE);
#ifdef QBMAN_CHECKING
/* We should never be asked to initialise for a portal that isn't in
* the power-on state. (Ie. don't forget to reset portals when they are
* decommissioned!)
*/
reg = qbman_cinh_read(s, QBMAN_CINH_SWP_CFG);
BUG_ON(reg);
#endif
#ifdef QBMAN_CINH_ONLY
reg = qbman_set_swp_cfg(4, 1, 0, 3, 2, 3, 0, 1, 0, 1, 0, 0);
#else
reg = qbman_set_swp_cfg(4, 0, 0, 3, 2, 3, 0, 1, 0, 1, 0, 0);
#endif
qbman_cinh_write(s, QBMAN_CINH_SWP_CFG, reg);
reg = qbman_cinh_read(s, QBMAN_CINH_SWP_CFG);
if (!reg) {
printf("The portal is not enabled!\n");
free(s->cena);
return -1;
}
return 0;
}
static inline void qbman_swp_sys_finish(struct qbman_swp_sys *s)
{
free((void *)s->cena);
}