1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2013 Xilinx, Inc.
4 * (C) Copyright 2015 Jagan Teki <jteki@openedev.com>
6 * Xilinx Zynq PS SPI controller driver (master mode only)
16 #include <linux/delay.h>
18 DECLARE_GLOBAL_DATA_PTR;
20 /* zynq spi register bit masks ZYNQ_SPI_<REG>_<BIT>_MASK */
21 #define ZYNQ_SPI_CR_MSA_MASK BIT(15) /* Manual start enb */
22 #define ZYNQ_SPI_CR_MCS_MASK BIT(14) /* Manual chip select */
23 #define ZYNQ_SPI_CR_CS_MASK GENMASK(13, 10) /* Chip select */
24 #define ZYNQ_SPI_CR_BAUD_MASK GENMASK(5, 3) /* Baud rate div */
25 #define ZYNQ_SPI_CR_CPHA_MASK BIT(2) /* Clock phase */
26 #define ZYNQ_SPI_CR_CPOL_MASK BIT(1) /* Clock polarity */
27 #define ZYNQ_SPI_CR_MSTREN_MASK BIT(0) /* Mode select */
28 #define ZYNQ_SPI_IXR_RXNEMPTY_MASK BIT(4) /* RX_FIFO_not_empty */
29 #define ZYNQ_SPI_IXR_TXOW_MASK BIT(2) /* TX_FIFO_not_full */
30 #define ZYNQ_SPI_IXR_ALL_MASK GENMASK(6, 0) /* All IXR bits */
31 #define ZYNQ_SPI_ENR_SPI_EN_MASK BIT(0) /* SPI Enable */
33 #define ZYNQ_SPI_CR_BAUD_MAX 8 /* Baud rate divisor max val */
34 #define ZYNQ_SPI_CR_BAUD_SHIFT 3 /* Baud rate divisor shift */
35 #define ZYNQ_SPI_CR_SS_SHIFT 10 /* Slave select shift */
37 #define ZYNQ_SPI_FIFO_DEPTH 128
38 #ifndef CONFIG_SYS_ZYNQ_SPI_WAIT
39 #define CONFIG_SYS_ZYNQ_SPI_WAIT (CONFIG_SYS_HZ/100) /* 10 ms */
42 /* zynq spi register set */
43 struct zynq_spi_regs {
56 /* zynq spi platform data */
57 struct zynq_spi_platdata {
58 struct zynq_spi_regs *regs;
59 u32 frequency; /* input frequency */
61 uint deactivate_delay_us; /* Delay to wait after deactivate */
62 uint activate_delay_us; /* Delay to wait after activate */
66 struct zynq_spi_priv {
67 struct zynq_spi_regs *regs;
70 ulong last_transaction_us; /* Time of last transaction end */
72 u32 freq; /* required frequency */
75 static int zynq_spi_ofdata_to_platdata(struct udevice *bus)
77 struct zynq_spi_platdata *plat = bus->platdata;
78 const void *blob = gd->fdt_blob;
79 int node = dev_of_offset(bus);
81 plat->regs = (struct zynq_spi_regs *)devfdt_get_addr(bus);
83 /* FIXME: Use 250MHz as a suitable default */
84 plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
86 plat->deactivate_delay_us = fdtdec_get_int(blob, node,
87 "spi-deactivate-delay", 0);
88 plat->activate_delay_us = fdtdec_get_int(blob, node,
89 "spi-activate-delay", 0);
90 plat->speed_hz = plat->frequency / 2;
92 debug("%s: regs=%p max-frequency=%d\n", __func__,
93 plat->regs, plat->frequency);
98 static void zynq_spi_init_hw(struct zynq_spi_priv *priv)
100 struct zynq_spi_regs *regs = priv->regs;
104 confr = ZYNQ_SPI_ENR_SPI_EN_MASK;
105 writel(~confr, ®s->enr);
107 /* Disable Interrupts */
108 writel(ZYNQ_SPI_IXR_ALL_MASK, ®s->idr);
111 while (readl(®s->isr) &
112 ZYNQ_SPI_IXR_RXNEMPTY_MASK)
115 /* Clear Interrupts */
116 writel(ZYNQ_SPI_IXR_ALL_MASK, ®s->isr);
118 /* Manual slave select and Auto start */
119 confr = ZYNQ_SPI_CR_MCS_MASK | ZYNQ_SPI_CR_CS_MASK |
120 ZYNQ_SPI_CR_MSTREN_MASK;
121 confr &= ~ZYNQ_SPI_CR_MSA_MASK;
122 writel(confr, ®s->cr);
125 writel(ZYNQ_SPI_ENR_SPI_EN_MASK, ®s->enr);
128 static int zynq_spi_probe(struct udevice *bus)
130 struct zynq_spi_platdata *plat = dev_get_platdata(bus);
131 struct zynq_spi_priv *priv = dev_get_priv(bus);
133 priv->regs = plat->regs;
134 priv->fifo_depth = ZYNQ_SPI_FIFO_DEPTH;
136 /* init the zynq spi hw */
137 zynq_spi_init_hw(priv);
142 static void spi_cs_activate(struct udevice *dev)
144 struct udevice *bus = dev->parent;
145 struct zynq_spi_platdata *plat = bus->platdata;
146 struct zynq_spi_priv *priv = dev_get_priv(bus);
147 struct zynq_spi_regs *regs = priv->regs;
150 /* If it's too soon to do another transaction, wait */
151 if (plat->deactivate_delay_us && priv->last_transaction_us) {
152 ulong delay_us; /* The delay completed so far */
153 delay_us = timer_get_us() - priv->last_transaction_us;
154 if (delay_us < plat->deactivate_delay_us)
155 udelay(plat->deactivate_delay_us - delay_us);
158 clrbits_le32(®s->cr, ZYNQ_SPI_CR_CS_MASK);
159 cr = readl(®s->cr);
161 * CS cal logic: CS[13:10]
166 cr |= (~(1 << priv->cs) << ZYNQ_SPI_CR_SS_SHIFT) & ZYNQ_SPI_CR_CS_MASK;
167 writel(cr, ®s->cr);
169 if (plat->activate_delay_us)
170 udelay(plat->activate_delay_us);
173 static void spi_cs_deactivate(struct udevice *dev)
175 struct udevice *bus = dev->parent;
176 struct zynq_spi_platdata *plat = bus->platdata;
177 struct zynq_spi_priv *priv = dev_get_priv(bus);
178 struct zynq_spi_regs *regs = priv->regs;
180 setbits_le32(®s->cr, ZYNQ_SPI_CR_CS_MASK);
182 /* Remember time of this transaction so we can honour the bus delay */
183 if (plat->deactivate_delay_us)
184 priv->last_transaction_us = timer_get_us();
187 static int zynq_spi_claim_bus(struct udevice *dev)
189 struct udevice *bus = dev->parent;
190 struct zynq_spi_priv *priv = dev_get_priv(bus);
191 struct zynq_spi_regs *regs = priv->regs;
193 writel(ZYNQ_SPI_ENR_SPI_EN_MASK, ®s->enr);
198 static int zynq_spi_release_bus(struct udevice *dev)
200 struct udevice *bus = dev->parent;
201 struct zynq_spi_priv *priv = dev_get_priv(bus);
202 struct zynq_spi_regs *regs = priv->regs;
205 confr = ZYNQ_SPI_ENR_SPI_EN_MASK;
206 writel(~confr, ®s->enr);
211 static int zynq_spi_xfer(struct udevice *dev, unsigned int bitlen,
212 const void *dout, void *din, unsigned long flags)
214 struct udevice *bus = dev->parent;
215 struct zynq_spi_priv *priv = dev_get_priv(bus);
216 struct zynq_spi_regs *regs = priv->regs;
217 struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
218 u32 len = bitlen / 8;
219 u32 tx_len = len, rx_len = len, tx_tvl;
220 const u8 *tx_buf = dout;
221 u8 *rx_buf = din, buf;
224 debug("spi_xfer: bus:%i cs:%i bitlen:%i len:%i flags:%lx\n",
225 bus->seq, slave_plat->cs, bitlen, len, flags);
228 debug("spi_xfer: Non byte aligned SPI transfer\n");
232 priv->cs = slave_plat->cs;
233 if (flags & SPI_XFER_BEGIN)
234 spi_cs_activate(dev);
237 /* Write the data into TX FIFO - tx threshold is fifo_depth */
239 while ((tx_tvl < priv->fifo_depth) && tx_len) {
244 writel(buf, ®s->txdr);
249 /* Check TX FIFO completion */
251 status = readl(®s->isr);
252 while (!(status & ZYNQ_SPI_IXR_TXOW_MASK)) {
253 if (get_timer(ts) > CONFIG_SYS_ZYNQ_SPI_WAIT) {
254 printf("spi_xfer: Timeout! TX FIFO not full\n");
257 status = readl(®s->isr);
260 /* Read the data from RX FIFO */
261 status = readl(®s->isr);
262 while ((status & ZYNQ_SPI_IXR_RXNEMPTY_MASK) && rx_len) {
263 buf = readl(®s->rxdr);
266 status = readl(®s->isr);
271 if (flags & SPI_XFER_END)
272 spi_cs_deactivate(dev);
277 static int zynq_spi_set_speed(struct udevice *bus, uint speed)
279 struct zynq_spi_platdata *plat = bus->platdata;
280 struct zynq_spi_priv *priv = dev_get_priv(bus);
281 struct zynq_spi_regs *regs = priv->regs;
283 u8 baud_rate_val = 0;
285 if (speed > plat->frequency)
286 speed = plat->frequency;
288 /* Set the clock frequency */
289 confr = readl(®s->cr);
291 /* Set baudrate x8, if the freq is 0 */
293 } else if (plat->speed_hz != speed) {
294 while ((baud_rate_val < ZYNQ_SPI_CR_BAUD_MAX) &&
296 (2 << baud_rate_val)) > speed))
298 plat->speed_hz = speed / (2 << baud_rate_val);
300 confr &= ~ZYNQ_SPI_CR_BAUD_MASK;
301 confr |= (baud_rate_val << ZYNQ_SPI_CR_BAUD_SHIFT);
303 writel(confr, ®s->cr);
306 debug("zynq_spi_set_speed: regs=%p, speed=%d\n",
307 priv->regs, priv->freq);
312 static int zynq_spi_set_mode(struct udevice *bus, uint mode)
314 struct zynq_spi_priv *priv = dev_get_priv(bus);
315 struct zynq_spi_regs *regs = priv->regs;
318 /* Set the SPI Clock phase and polarities */
319 confr = readl(®s->cr);
320 confr &= ~(ZYNQ_SPI_CR_CPHA_MASK | ZYNQ_SPI_CR_CPOL_MASK);
323 confr |= ZYNQ_SPI_CR_CPHA_MASK;
325 confr |= ZYNQ_SPI_CR_CPOL_MASK;
327 writel(confr, ®s->cr);
330 debug("zynq_spi_set_mode: regs=%p, mode=%d\n", priv->regs, priv->mode);
335 static const struct dm_spi_ops zynq_spi_ops = {
336 .claim_bus = zynq_spi_claim_bus,
337 .release_bus = zynq_spi_release_bus,
338 .xfer = zynq_spi_xfer,
339 .set_speed = zynq_spi_set_speed,
340 .set_mode = zynq_spi_set_mode,
343 static const struct udevice_id zynq_spi_ids[] = {
344 { .compatible = "xlnx,zynq-spi-r1p6" },
345 { .compatible = "cdns,spi-r1p6" },
349 U_BOOT_DRIVER(zynq_spi) = {
352 .of_match = zynq_spi_ids,
353 .ops = &zynq_spi_ops,
354 .ofdata_to_platdata = zynq_spi_ofdata_to_platdata,
355 .platdata_auto_alloc_size = sizeof(struct zynq_spi_platdata),
356 .priv_auto_alloc_size = sizeof(struct zynq_spi_priv),
357 .probe = zynq_spi_probe,