mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-30 14:19:16 +00:00
Code Issues Releases Wiki Activity

mtd: st_spi_fsm: Search for preferred FSM message sequence configurations

Browse source 
Here we provide a means to traverse though all supplied FSM message
sequence configurations and pick one based on our chip's capabilities.
The first one we match will be the preferred one, as they are
presented in order of preference.

Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Lee Jones 2014-03-20 09:20:42 +00:00 committed by Brian Norris
parent 24fec651d1
commit 089812740d
1 changed files with 27 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
drivers/mtd/devices/st_spi_fsm.c
View file

@ -222,6 +222,18 @@ struct stfsm_seq {
uint32_t seq_cfg;
} __packed __aligned(4);
/* Parameters to configure a READ or WRITE FSM sequence */
struct seq_rw_config {
uint32_t flags; /* flags to support config */
uint8_t cmd; /* FLASH command */
int write; /* Write Sequence */
uint8_t addr_pads; /* No. of addr pads (MODE & DUMMY) */
uint8_t data_pads; /* No. of data pads */
uint8_t mode_data; /* MODE data */
uint8_t mode_cycles; /* No. of MODE cycles */
uint8_t dummy_cycles; /* No. of DUMMY cycles */
};
/* SPI Flash Device Table */
struct flash_info {
char *name;
@ -462,6 +474,21 @@ static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf,
}
}
/* Search for preferred configuration based on available flags */
static struct seq_rw_config *
stfsm_search_seq_rw_configs(struct stfsm *fsm,
struct seq_rw_config cfgs[])
{
struct seq_rw_config *config;
int flags = fsm->info->flags;
for (config = cfgs; config->cmd != 0; config++)
if ((config->flags & flags) == config->flags)
return config;
return NULL;
}
static void stfsm_read_jedec(struct stfsm *fsm, uint8_t *const jedec)
{
const struct stfsm_seq *seq = &stfsm_seq_read_jedec;