diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc8xx/spi.c')
| -rw-r--r-- | arch/powerpc/cpu/mpc8xx/spi.c | 43 |
1 files changed, 18 insertions, 25 deletions
diff --git a/arch/powerpc/cpu/mpc8xx/spi.c b/arch/powerpc/cpu/mpc8xx/spi.c index e7d197f..6e3e86f 100644 --- a/arch/powerpc/cpu/mpc8xx/spi.c +++ b/arch/powerpc/cpu/mpc8xx/spi.c @@ -50,11 +50,7 @@ /* ------------------- * Function prototypes * ------------------- */ -void spi_init (void); - -ssize_t spi_read (uchar *, int, uchar *, int); -ssize_t spi_write (uchar *, int, uchar *, int); -ssize_t spi_xfer (size_t); +ssize_t spi_xfer(size_t); /* ------------------- * Variables @@ -66,10 +62,10 @@ ssize_t spi_xfer (size_t); * Initially we place the RX and TX buffers at a fixed location in DPRAM! * ---------------------------------------------------------------------- */ static uchar *rxbuf = - (uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem + (uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem [CONFIG_SYS_SPI_INIT_OFFSET]; static uchar *txbuf = - (uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem + (uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem [CONFIG_SYS_SPI_INIT_OFFSET+MAX_BUFFER]; /* ************************************************************************** @@ -81,7 +77,7 @@ static uchar *txbuf = * return: --- * * *********************************************************************** */ -void spi_init_f (void) +void spi_init_f(void) { immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR; cpm8xx_t __iomem *cp = &immr->im_cpm; @@ -120,7 +116,7 @@ void spi_init_f (void) * PBODR[28] = 1 [0x00000008] -> open drain: SPIMISO * PBODR[29] = 0 [0x00000004] -> active output SPIMOSI * PBODR[30] = 0 [0x00000002] -> active output: SPICLK - * PBODR[31] = 0 [0x00000001] -> active output: GPIO OUT: CS for PCUE/CCM + * PBODR[31] = 0 [0x00000001] -> active output GPIO OUT: CS for PCUE/CCM * ---------------------------------------------- */ clrsetbits_be16(&cp->cp_pbodr, 0x00000007, 0x00000008); @@ -209,7 +205,7 @@ void spi_init_f (void) * return: --- * * *********************************************************************** */ -void spi_init_r (void) +void spi_init_r(void) { immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR; cpm8xx_t __iomem *cp = &immr->im_cpm; @@ -224,8 +220,8 @@ void spi_init_r (void) rbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_RX]; /* Allocate memory for RX and TX buffers */ - rxbuf = (uchar *) malloc (MAX_BUFFER); - txbuf = (uchar *) malloc (MAX_BUFFER); + rxbuf = (uchar *)malloc(MAX_BUFFER); + txbuf = (uchar *)malloc(MAX_BUFFER); out_be32(&rbdf->cbd_bufaddr, (ulong)rxbuf); out_be32(&tbdf->cbd_bufaddr, (ulong)txbuf); @@ -236,7 +232,7 @@ void spi_init_r (void) /**************************************************************************** * Function: spi_write **************************************************************************** */ -ssize_t spi_write (uchar *addr, int alen, uchar *buffer, int len) +ssize_t spi_write(uchar *addr, int alen, uchar *buffer, int len) { int i; @@ -253,14 +249,12 @@ ssize_t spi_write (uchar *addr, int alen, uchar *buffer, int len) *txbuf = SPI_EEPROM_RDSR; /* read status */ txbuf[1] = 0; spi_xfer(2); - if (!(rxbuf[1] & 1)) { + if (!(rxbuf[1] & 1)) break; - } udelay(1000); } - if (i >= 1000) { - printf ("*** spi_write: Time out while writing!\n"); - } + if (i >= 1000) + printf("*** spi_write: Time out while writing!\n"); return len; } @@ -268,7 +262,7 @@ ssize_t spi_write (uchar *addr, int alen, uchar *buffer, int len) /**************************************************************************** * Function: spi_read **************************************************************************** */ -ssize_t spi_read (uchar *addr, int alen, uchar *buffer, int len) +ssize_t spi_read(uchar *addr, int alen, uchar *buffer, int len) { memset(rxbuf, 0, MAX_BUFFER); memset(txbuf, 0, MAX_BUFFER); @@ -290,7 +284,7 @@ ssize_t spi_read (uchar *addr, int alen, uchar *buffer, int len) /**************************************************************************** * Function: spi_xfer **************************************************************************** */ -ssize_t spi_xfer (size_t count) +ssize_t spi_xfer(size_t count) { immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR; cpm8xx_t __iomem *cp = &immr->im_cpm; @@ -327,16 +321,15 @@ ssize_t spi_xfer (size_t count) * Wait for SPI transmit to get out * or time out (1 second = 1000 ms) * -------------------------------- */ - for (tm=0; tm<1000; ++tm) { + for (tm = 0; tm < 1000; ++tm) { if (in_8(&cp->cp_spie) & SPI_TXB) /* Tx Buffer Empty */ break; if ((in_be16(&tbdf->cbd_sc) & BD_SC_READY) == 0) break; - udelay (1000); - } - if (tm >= 1000) { - printf ("*** spi_xfer: Time out while xferring to/from SPI!\n"); + udelay(1000); } + if (tm >= 1000) + printf("*** spi_xfer: Time out while xferring to/from SPI!\n"); /* Clear CS for device */ setbits_be32(&cp->cp_pbdat, 0x0001); |