+int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
+{
+ u32 io_base = mcbsp[id].io_base;
+ omap_mcbsp_word_length tx_word_length = mcbsp[id].tx_word_length;
+ omap_mcbsp_word_length rx_word_length = mcbsp[id].rx_word_length;
+ u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
+
+ if (tx_word_length != rx_word_length)
+ return -EINVAL;
+
+ /* First we wait for the transmitter to be ready */
+ spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
+ while (!(spcr2 & XRDY)) {
+ spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
+ if (attempts++ > 1000) {
+ /* We must reset the transmitter */
+ OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
+ udelay(10);
+ OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
+ udelay(10);
+ printk("McBSP transmitter not ready\n");
+ return -EAGAIN;
+ }
+ }
+
+ /* Now we can push the data */
+ if (tx_word_length > OMAP_MCBSP_WORD_16)
+ OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
+ OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
+
+ /* We wait for the receiver to be ready */
+ spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
+ while (!(spcr1 & RRDY)) {
+ spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
+ if (attempts++ > 1000) {
+ /* We must reset the receiver */
+ OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
+ udelay(10);
+ OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
+ udelay(10);
+ printk("McBSP receiver not ready\n");
+ return -EAGAIN;
+ }
+ }
+
+ /* Receiver is ready, let's read the dummy data */
+ if (rx_word_length > OMAP_MCBSP_WORD_16)
+ word_msb = OMAP_MCBSP_READ(io_base, DRR2);
+ word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
+
+ return 0;
+}
+
+int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 * word)
+{
+ u32 io_base = mcbsp[id].io_base, clock_word = 0;
+ omap_mcbsp_word_length tx_word_length = mcbsp[id].tx_word_length;
+ omap_mcbsp_word_length rx_word_length = mcbsp[id].rx_word_length;
+ u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
+
+ if (tx_word_length != rx_word_length)
+ return -EINVAL;
+
+ /* First we wait for the transmitter to be ready */
+ spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
+ while (!(spcr2 & XRDY)) {
+ spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
+ if (attempts++ > 1000) {
+ /* We must reset the transmitter */
+ OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
+ udelay(10);
+ OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
+ udelay(10);
+ printk("McBSP transmitter not ready\n");
+ return -EAGAIN;
+ }
+ }
+
+ /* We first need to enable the bus clock */
+ if (tx_word_length > OMAP_MCBSP_WORD_16)
+ OMAP_MCBSP_WRITE(io_base, DXR2, clock_word >> 16);
+ OMAP_MCBSP_WRITE(io_base, DXR1, clock_word & 0xffff);
+
+ /* We wait for the receiver to be ready */
+ spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
+ while (!(spcr1 & RRDY)) {
+ spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
+ if (attempts++ > 1000) {
+ /* We must reset the receiver */
+ OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
+ udelay(10);
+ OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
+ udelay(10);
+ printk("McBSP receiver not ready\n");
+ return -EAGAIN;
+ }
+ }
+
+ /* Receiver is ready, there is something for us */
+ if (rx_word_length > OMAP_MCBSP_WORD_16)
+ word_msb = OMAP_MCBSP_READ(io_base, DRR2);
+ word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
+
+ word[0] = (word_lsb | (word_msb << 16));
+
+ return 0;
+}
+
+