2  * SH QSPI (Quad SPI) driver
7  * SPDX-License-Identifier:	GPL-2.0
13 #include <spi.h>
71 	struct spi_slave	slave;  member
75 static inline struct sh_qspi_slave *to_sh_qspi(struct spi_slave *slave)  in to_sh_qspi()  argument
77 	return container_of(slave, struct sh_qspi_slave, slave);  in to_sh_qspi()
84 	writeb(SPCR_MSTR, &ss->regs->spcr);  in sh_qspi_init()
87 	writeb(0x00, &ss->regs->sslp);  in sh_qspi_init()
90 	writeb(SPPCR_IO3FV|SPPCR_IO2FV, &ss->regs->sppcr);  in sh_qspi_init()
93 	writeb(0x01, &ss->regs->spbr);  in sh_qspi_init()
96 	writeb(0x00, &ss->regs->spdcr);  in sh_qspi_init()
99 	writeb(0x00, &ss->regs->spckd);  in sh_qspi_init()
102 	writeb(0x00, &ss->regs->sslnd);  in sh_qspi_init()
104 	/* Set next-access delay value */  in sh_qspi_init()
105 	writeb(0x00, &ss->regs->spnd);  in sh_qspi_init()
108 	writew(SPCMD_INIT2, &ss->regs->spcmd0);  in sh_qspi_init()
111 	setbits_8(&ss->regs->spbfcr, SPBFCR_TXRST|SPBFCR_RXRST);  in sh_qspi_init()
114 	clrbits_8(&ss->regs->spbfcr, SPBFCR_TXRST|SPBFCR_RXRST);  in sh_qspi_init()
117 	writeb(0x00, &ss->regs->spscr);  in sh_qspi_init()
119 	/* Enable SPI function */  in sh_qspi_init()
120 	setbits_8(&ss->regs->spcr, SPCR_SPE);  in sh_qspi_init()
128 void spi_cs_activate(struct spi_slave *slave)  in spi_cs_activate()  argument
130 	struct sh_qspi_slave *ss = to_sh_qspi(slave);  in spi_cs_activate()
133 	writeb(SPCR_MSTR, &ss->regs->spcr);  in spi_cs_activate()
136 	writew(SPCMD_INIT1, &ss->regs->spcmd0);  in spi_cs_activate()
139 	setbits_8(&ss->regs->spbfcr, SPBFCR_TXRST|SPBFCR_RXRST);  in spi_cs_activate()
142 	clrbits_8(&ss->regs->spbfcr, SPBFCR_TXRST|SPBFCR_RXRST);  in spi_cs_activate()
145 	writeb(0x00, &ss->regs->spscr);  in spi_cs_activate()
147 	/* Enable SPI function */  in spi_cs_activate()
148 	setbits_8(&ss->regs->spcr, SPCR_SPE);  in spi_cs_activate()
151 void spi_cs_deactivate(struct spi_slave *slave)  in spi_cs_deactivate()  argument
153 	struct sh_qspi_slave *ss = to_sh_qspi(slave);  in spi_cs_deactivate()
155 	/* Disable SPI Function */  in spi_cs_deactivate()
156 	clrbits_8(&ss->regs->spcr, SPCR_SPE);  in spi_cs_deactivate()
178 	ss->regs = (struct sh_qspi_regs *)SH_QSPI_BASE;  in spi_setup_slave()
183 	return &ss->slave;  in spi_setup_slave()
186 void spi_free_slave(struct spi_slave *slave)  in spi_free_slave()  argument
188 	struct sh_qspi_slave *spi = to_sh_qspi(slave);  in spi_free_slave()  local
190 	free(spi);  in spi_free_slave()
193 int spi_claim_bus(struct spi_slave *slave)  in spi_claim_bus()  argument
198 void spi_release_bus(struct spi_slave *slave)  in spi_release_bus()  argument
202 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,  in spi_xfer()  argument
205 	struct sh_qspi_slave *ss = to_sh_qspi(slave);  in spi_xfer()
210 	u32 *spbmul0 = &ss->regs->spbmul0;  in spi_xfer()
214 			spi_cs_deactivate(slave);  in spi_xfer()
226 		spi_cs_activate(slave);  in spi_xfer()
244 		 * it in one burst, otherwise transfer on byte-by-byte basis.  in spi_xfer()
248 		clrsetbits_8(&ss->regs->spbfcr, SPBFCR_TXTRG | SPBFCR_RXTRG,  in spi_xfer()
251 		ret = wait_for_bit_8(&ss->regs->spsr, SPSR_SPTEF,  in spi_xfer()
257 			writeb(*tdata, &ss->regs->spdr);  in spi_xfer()
262 		ret = wait_for_bit_8(&ss->regs->spsr, SPSR_SPRFF,  in spi_xfer()
268 			*rdata = readb(&ss->regs->spdr);  in spi_xfer()
273 		nbyte -= chunk;  in spi_xfer()
277 		spi_cs_deactivate(slave);  in spi_xfer()