21 #define SPI_TIMEOUT		0x100000
22 #define SPI0_BUS		0
24 #define SPI0_BASE		0xf0b00000
25 #define SPI1_BASE		0xf0f00000
31 	u32	format;		/* 0x10 */
35 	u32	tctrl;		/* 0x20 */
37 #define TRAMODE_MASK	(0x0F<<TRAMODE_OFFSET)
38 #define TRAMODE_WR_SYNC	(0<<TRAMODE_OFFSET)
49 #define WCNT_MASK	(0x1FF<<WCNT_OFFSET)
50 #define RCNT_OFFSET	0
51 #define RCNT_MASK	(0x1FF<<RCNT_OFFSET)
55 	u32	ctrl;		/* 0x30 */
62 #define SPIRST		(1<<0)
66 #define TXFVE_MASK	(0x1F<<16)
69 #define RXFVE_MASK	(0x1F<<RXFVE_OFFSET)
70 #define SPIBSY		(1<<0)
73 	u32	timing;		/* 0x40 */
74 #define SCLK_DIV_MASK	0xFF
94 static int __atcspi200_spi_set_speed(struct nds_spi_slave *ns)  in __atcspi200_spi_set_speed()  argument
98 	tm = ns->regs->timing;  in __atcspi200_spi_set_speed()
101 	if(ns->freq >= ns->clock)  in __atcspi200_spi_set_speed()
102 		div =0xff;  in __atcspi200_spi_set_speed()
104 		for (div = 0; div < 0xff; div++) {  in __atcspi200_spi_set_speed()
105 			if (ns->freq >= ns->clock / (2 * (div + 1)))  in __atcspi200_spi_set_speed()
111 	ns->regs->timing = tm;  in __atcspi200_spi_set_speed()
113 	return 0;  in __atcspi200_spi_set_speed()
117 static int __atcspi200_spi_claim_bus(struct nds_spi_slave *ns)  in __atcspi200_spi_claim_bus()  argument
119 		unsigned int format=0;  in __atcspi200_spi_claim_bus()
120 		ns->regs->ctrl |= (TXFRST|RXFRST|SPIRST);  in __atcspi200_spi_claim_bus()
121 		while((ns->regs->ctrl &(TXFRST|RXFRST|SPIRST))&&(ns->to--))  in __atcspi200_spi_claim_bus()
122 			if(!ns->to)  in __atcspi200_spi_claim_bus()
125 		ns->cmd_len = 0;  in __atcspi200_spi_claim_bus()
126 		format = ns->mode|DATA_LENGTH(8);  in __atcspi200_spi_claim_bus()
127 		ns->regs->format = format;  in __atcspi200_spi_claim_bus()
128 		__atcspi200_spi_set_speed(ns);  in __atcspi200_spi_claim_bus()
130 		return 0;  in __atcspi200_spi_claim_bus()
133 static int __atcspi200_spi_release_bus(struct nds_spi_slave *ns)  in __atcspi200_spi_release_bus()  argument
136 	return 0;  in __atcspi200_spi_release_bus()
139 static int __atcspi200_spi_start(struct nds_spi_slave *ns)  in __atcspi200_spi_start()  argument
141 	int i,olen=0;  in __atcspi200_spi_start()
142 	int tc = ns->regs->tctrl;  in __atcspi200_spi_start()
145 	if ((ns->din)&&(ns->cmd_len))  in __atcspi200_spi_start()
147 	else if (ns->din)  in __atcspi200_spi_start()
152 	if(ns->dout)  in __atcspi200_spi_start()
153 		olen = ns->tran_len;  in __atcspi200_spi_start()
154 	tc |= (ns->cmd_len+olen-1) << WCNT_OFFSET;  in __atcspi200_spi_start()
156 	if(ns->din)  in __atcspi200_spi_start()
157 		tc |= (ns->tran_len-1) << RCNT_OFFSET;  in __atcspi200_spi_start()
159 	ns->regs->tctrl = tc;  in __atcspi200_spi_start()
160 	ns->regs->cmd = 1;  in __atcspi200_spi_start()
162 	for (i=0;i<ns->cmd_len;i++)  in __atcspi200_spi_start()
163 		ns->regs->data = ns->cmd_buf[i];  in __atcspi200_spi_start()
165 	return 0;  in __atcspi200_spi_start()
168 static int __atcspi200_spi_stop(struct nds_spi_slave *ns)  in __atcspi200_spi_stop()  argument
170 	ns->regs->timing = ns->mtiming;  in __atcspi200_spi_stop()
171 	while ((ns->regs->status & SPIBSY)&&(ns->to--))  in __atcspi200_spi_stop()
172 		if (!ns->to)  in __atcspi200_spi_stop()
175 	return 0;  in __atcspi200_spi_stop()
178 static void __nspi_espi_tx(struct nds_spi_slave *ns, const void *dout)  in __nspi_espi_tx()  argument
180 	ns->regs->data = *(u8 *)dout;  in __nspi_espi_tx()
183 static int __nspi_espi_rx(struct nds_spi_slave *ns, void *din, unsigned int bytes)  in __nspi_espi_rx()  argument
185 	*(u8 *)din = ns->regs->data;  in __nspi_espi_rx()
190 static int __atcspi200_spi_xfer(struct nds_spi_slave *ns,  in __atcspi200_spi_xfer()  argument
199 		u8 *cmd_buf = ns->cmd_buf;  in __atcspi200_spi_xfer()
200 		size_t cmd_len = ns->cmd_len;  in __atcspi200_spi_xfer()
203 		int ret = 0;  in __atcspi200_spi_xfer()
205 		max_tran_len = ns->max_transfer_length;  in __atcspi200_spi_xfer()
208 			cmd_len = ns->cmd_len = data_len;  in __atcspi200_spi_xfer()
210 			return 0;  in __atcspi200_spi_xfer()
212 		case 0:  in __atcspi200_spi_xfer()
214 			if (bitlen == 0) {  in __atcspi200_spi_xfer()
215 				return 0;  in __atcspi200_spi_xfer()
217 			ns->data_len = data_len;  in __atcspi200_spi_xfer()
218 			ns->din = (u8 *)data_in;  in __atcspi200_spi_xfer()
219 			ns->dout = (u8 *)data_out;  in __atcspi200_spi_xfer()
223 			ns->data_len = 0;  in __atcspi200_spi_xfer()
224 			ns->din = 0;  in __atcspi200_spi_xfer()
225 			ns->dout = 0;  in __atcspi200_spi_xfer()
226 			cmd_len = ns->cmd_len = data_len;  in __atcspi200_spi_xfer()
228 			data_out = 0;  in __atcspi200_spi_xfer()
229 			data_len = 0;  in __atcspi200_spi_xfer()
230 			__atcspi200_spi_start(ns);  in __atcspi200_spi_xfer()
240 			ns->tran_len = tran_len;  in __atcspi200_spi_xfer()
243 			if(num_bytes == 0)  in __atcspi200_spi_xfer()
245 			__atcspi200_spi_start(ns);  in __atcspi200_spi_xfer()
248 				event = in_le32(&ns->regs->status);  in __atcspi200_spi_xfer()
250 					__nspi_espi_tx(ns, dout);  in __atcspi200_spi_xfer()
264 					if (__nspi_espi_rx(ns, din, rx_bytes) == rx_bytes) {  in __atcspi200_spi_xfer()
274 				ns->cmd_buf[1] += ((tran_len>>16)&0xff);  in __atcspi200_spi_xfer()
275 				ns->cmd_buf[2] += ((tran_len>>8)&0xff);  in __atcspi200_spi_xfer()
276 				ns->cmd_buf[3] += ((tran_len)&0xff);  in __atcspi200_spi_xfer()
277 				ns->data_len = data_len;  in __atcspi200_spi_xfer()
279 			ret = __atcspi200_spi_stop(ns);  in __atcspi200_spi_xfer()
281 		ret = __atcspi200_spi_stop(ns);  in __atcspi200_spi_xfer()
288 	struct nds_spi_slave *ns = dev_get_priv(bus);  in atcspi200_spi_set_speed()  local
292 	ns->freq = max_hz;  in atcspi200_spi_set_speed()
293 	__atcspi200_spi_set_speed(ns);  in atcspi200_spi_set_speed()
295 	return 0;  in atcspi200_spi_set_speed()
300 	struct nds_spi_slave *ns = dev_get_priv(bus);  in atcspi200_spi_set_mode()  local
303 	ns->mode = mode;  in atcspi200_spi_set_mode()
305 	return 0;  in atcspi200_spi_set_mode()
313 	struct nds_spi_slave *ns = dev_get_priv(bus);  in atcspi200_spi_claim_bus()  local
315 	if (slave_plat->cs >= ns->num_cs) {  in atcspi200_spi_claim_bus()
320 	return __atcspi200_spi_claim_bus(ns);  in atcspi200_spi_claim_bus()
325 	struct nds_spi_slave *ns = dev_get_priv(dev->parent);  in atcspi200_spi_release_bus()  local
327 	return __atcspi200_spi_release_bus(ns);  in atcspi200_spi_release_bus()
335 	struct nds_spi_slave *ns = dev_get_priv(bus);  in atcspi200_spi_xfer()  local
337 	return __atcspi200_spi_xfer(ns, bitlen, dout, din, flags);  in atcspi200_spi_xfer()
342 	struct nds_spi_slave *ns = dev_get_priv(bus);  in atcspi200_spi_get_clk()  local
347 	ret = clk_get_by_index(bus, 0, &clk);  in atcspi200_spi_get_clk()
355 	ns->clock = clk_rate;  in atcspi200_spi_get_clk()
358 	return 0;  in atcspi200_spi_get_clk()
363 	struct nds_spi_slave *ns = dev_get_priv(bus);  in atcspi200_spi_probe()  local
365 	ns->to = SPI_TIMEOUT;  in atcspi200_spi_probe()
366 	ns->max_transfer_length = MAX_TRANSFER_LEN;  in atcspi200_spi_probe()
367 	ns->mtiming = ns->regs->timing;  in atcspi200_spi_probe()
370 	return 0;  in atcspi200_spi_probe()
375 	struct nds_spi_slave *ns = dev_get_priv(bus);  in atcspi200_ofdata_to_platadata()  local
379 	ns->regs = map_physmem(devfdt_get_addr(bus),  in atcspi200_ofdata_to_platadata()
382 	if (!ns->regs) {  in atcspi200_ofdata_to_platadata()
386 	ns->num_cs = fdtdec_get_int(blob, node, "num-cs", 4);  in atcspi200_ofdata_to_platadata()
388 	return 0;  in atcspi200_ofdata_to_platadata()