4  * simple SPI master driver.  Two do polled word-at-a-time I/O:
7  *	expanding the per-word routines from the inline templates below.
51 		u32 word, u8 bits)  in bitbang_txrx_be_cpha0()  argument
55 	u32 oldbit = (!(word & (1<<(bits-1)))) << 31;  in bitbang_txrx_be_cpha0()
57 	for (word <<= (32 - bits); likely(bits); bits--) {  in bitbang_txrx_be_cpha0()
61 			if ((word & (1 << 31)) != oldbit) {  in bitbang_txrx_be_cpha0()
62 				setmosi(spi, word & (1 << 31));  in bitbang_txrx_be_cpha0()
63 				oldbit = word & (1 << 31);  in bitbang_txrx_be_cpha0()
72 		word <<= 1;  in bitbang_txrx_be_cpha0()
74 			word |= getmiso(spi);  in bitbang_txrx_be_cpha0()
77 	return word;  in bitbang_txrx_be_cpha0()
83 		u32 word, u8 bits)  in bitbang_txrx_be_cpha1()  argument
87 	u32 oldbit = (!(word & (1<<(bits-1)))) << 31;  in bitbang_txrx_be_cpha1()
89 	for (word <<= (32 - bits); likely(bits); bits--) {  in bitbang_txrx_be_cpha1()
94 			if ((word & (1 << 31)) != oldbit) {  in bitbang_txrx_be_cpha1()
95 				setmosi(spi, word & (1 << 31));  in bitbang_txrx_be_cpha1()
96 				oldbit = word & (1 << 31);  in bitbang_txrx_be_cpha1()
105 		word <<= 1;  in bitbang_txrx_be_cpha1()
107 			word |= getmiso(spi);  in bitbang_txrx_be_cpha1()
109 	return word;  in bitbang_txrx_be_cpha1()
115 		u32 word, u8 bits)  in bitbang_txrx_le_cpha0()  argument
120 	u32 oldbit = !(word & 1);  in bitbang_txrx_le_cpha0()
126 			if ((word & 1) != oldbit) {  in bitbang_txrx_le_cpha0()
127 				setmosi(spi, word & 1);  in bitbang_txrx_le_cpha0()
128 				oldbit = word & 1;  in bitbang_txrx_le_cpha0()
137 		word >>= 1;  in bitbang_txrx_le_cpha0()
139 			word |= getmiso(spi) << rxbit;  in bitbang_txrx_le_cpha0()
142 	return word;  in bitbang_txrx_le_cpha0()
148 		u32 word, u8 bits)  in bitbang_txrx_le_cpha1()  argument
153 	u32 oldbit = !(word & 1);  in bitbang_txrx_le_cpha1()
160 			if ((word & 1) != oldbit) {  in bitbang_txrx_le_cpha1()
161 				setmosi(spi, word & 1);  in bitbang_txrx_le_cpha1()
162 				oldbit = word & 1;  in bitbang_txrx_le_cpha1()
171 		word >>= 1;  in bitbang_txrx_le_cpha1()
173 			word |= getmiso(spi) << rxbit;  in bitbang_txrx_le_cpha1()
175 	return word;  in bitbang_txrx_le_cpha1()