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codingstyle cleanup for spi driver

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..and rm unused CONFIG_FSL_SPI define

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
This commit is contained in:
Kim Phillips 2008-01-17 12:48:00 -06:00
parent 80ddd22626
commit 2956acd5ef
5 changed files with 37 additions and 34 deletions
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2
board/freescale/mpc8349emds/mpc8349emds.c
View file

@ -263,7 +263,7 @@ void spi_eeprom_chipsel(int cs)
{
volatile gpio83xx_t *iopd = &((immap_t *)CFG_IMMR)->gpio[0];
if(cs)
if (cs)
iopd->dat &= ~SPI_CS_MASK;
else
iopd->dat |= SPI_CS_MASK;

6
drivers/spi/Makefile
View file

@ -23,13 +23,13 @@
include $(TOPDIR)/config.mk
LIB := $(obj)libspi.a
LIB := $(obj)libspi.a
COBJS-y += mpc8xxx_spi.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
all: $(LIB)

57
drivers/spi/mpc8xxx_spi.c
View file

@ -27,16 +27,13 @@
#ifdef CONFIG_HARD_SPI
#define SPI_EV_NE 0x80000000 >> 22 /* Receiver Not Empty */
#define SPI_EV_NF 0x80000000 >> 23 /* Transmitter Not Full */
#define SPI_EV_NE (0x80000000 >> 22) /* Receiver Not Empty */
#define SPI_EV_NF (0x80000000 >> 23) /* Transmitter Not Full */
#define SPI_MODE_LOOP 0x80000000 >> 1 /* Loopback mode */
#define SPI_MODE_REV 0x80000000 >> 5 /* Reverse mode - MSB first */
#define SPI_MODE_MS 0x80000000 >> 6 /* Always master */
#define SPI_MODE_EN 0x80000000 >> 7 /* Enable interface */
#define SPI_PRESCALER(reg, div) (reg)=((reg) & 0xfff0ffff) | ((div)<<16)
#define SPI_CHARLENGTH(reg, div) (reg)=((reg) & 0xff0fffff) | ((div)<<20)
#define SPI_MODE_LOOP (0x80000000 >> 1) /* Loopback mode */
#define SPI_MODE_REV (0x80000000 >> 5) /* Reverse mode - MSB first */
#define SPI_MODE_MS (0x80000000 >> 6) /* Always master */
#define SPI_MODE_EN (0x80000000 >> 7) /* Enable interface */
#define SPI_TIMEOUT 1000
@ -44,18 +41,19 @@ void spi_init(void)
{
volatile spi8xxx_t *spi = &((immap_t *) (CFG_IMMR))->spi;
/* ------------------------------------------------
/*
* SPI pins on the MPC83xx are not muxed, so all we do is initialize
* some registers
* ------------------------------------------------ */
*/
spi->mode = SPI_MODE_REV | SPI_MODE_MS | SPI_MODE_EN;
SPI_PRESCALER(spi->mode, 1); /* Use SYSCLK / 8 (16.67MHz typ.) */
spi->mode = (spi->mode & 0xfff0ffff) | (1 << 16); /* Use SYSCLK / 8
(16.67MHz typ.) */
spi->event = 0xffffffff; /* Clear all SPI events */
spi->mask = 0x00000000; /* Mask all SPI interrupts */
spi->com = 0; /* LST bit doesn't do anything, so disregard */
}
int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar * dout, uchar * din)
int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din)
{
volatile spi8xxx_t *spi = &((immap_t *) (CFG_IMMR))->spi;
unsigned int tmpdout, tmpdin, event;
@ -81,16 +79,21 @@ int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar * dout, uchar * din)
/* The LEN field of the SPMODE register is set as follows:
*
* Bit length setting
* l <= 4 3
* 4 < l <= 16 l - 1
* l > 16 0
* Bit length setting
* len <= 4 3
* 4 < len <= 16 len - 1
* len > 16 0
*/
if (bitlen <= 16)
SPI_CHARLENGTH(spi->mode, bitlen <= 4 ? 3 : bitlen - 1);
else {
SPI_CHARLENGTH(spi->mode, 0);
if (bitlen <= 16) {
if (bitlen <= 4)
spi->mode = (spi->mode & 0xff0fffff) |
(3 << 20);
else
spi->mode = (spi->mode & 0xff0fffff) |
((bitlen - 1) << 20);
} else {
spi->mode = (spi->mode & 0xff0fffff);
/* Set up the next iteration if sending > 32 bits */
bitlen -= 32;
dout += 4;
@ -99,11 +102,11 @@ int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar * dout, uchar * din)
spi->tx = tmpdout; /* Write the data out */
debug("*** spi_xfer: ... %08x written\n", tmpdout);
/* --------------------------------
/*
* Wait for SPI transmit to get out
* or time out (1 second = 1000 ms)
* The NE event must be read and cleared first
* -------------------------------- */
*/
for (tm = 0, isRead = 0; tm < SPI_TIMEOUT; ++tm) {
event = spi->event;
if (event & SPI_EV_NE) {
@ -117,10 +120,12 @@ int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar * dout, uchar * din)
din += 4;
}
}
/* Only bail when we've had both NE and NF events.
/*
* Only bail when we've had both NE and NF events.
* This will cause timeouts on RO devices, so maybe
* in the future put an arbitrary delay after writing
* the device. Arbitrary delays suck, though... */
* the device. Arbitrary delays suck, though...
*/
if (isRead && (event & SPI_EV_NF))
break;
}
@ -132,7 +137,7 @@ int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar * dout, uchar * din)
if (chipsel != NULL)
(*chipsel) (0); /* deselect the target chip */
return 0;
}
#endif /* CONFIG_HARD_SPI */

3
include/asm-ppc/mpc8xxx_spi.h
View file

@ -32,8 +32,7 @@
defined(CONFIG_MPC8315) || \
defined(CONFIG_MPC837X)
typedef struct spi8xxx
{
typedef struct spi8xxx {
u8 res0[0x20]; /* 0x0-0x01f reserved */
u32 mode; /* mode register */
u32 event; /* event register */

3
include/configs/MPC8349EMDS.h
View file

@ -356,9 +356,8 @@
#define CFG_I2C2_OFFSET 0x3100
/* SPI */
#define CONFIG_HARD_SPI /* SPI with hardware support*/
#define CONFIG_HARD_SPI /* SPI with hardware support */
#undef CONFIG_SOFT_SPI /* SPI bit-banged */
#define CONFIG_FSL_SPI
/* GPIOs. Used as SPI chip selects */
#define CFG_GPIO1_PRELIM