2 * (C) Copyright 2013 Inc.
3 * (C) Copyright 2015 Jagan Teki <jteki@openedev.com>
5 * Xilinx Zynq PS SPI controller driver (master mode only)
7 * SPDX-License-Identifier: GPL-2.0+
17 #include <asm/arch/hardware.h>
19 /* zynq spi register bit masks ZYNQ_SPI_<REG>_<BIT>_MASK */
20 #define ZYNQ_SPI_CR_MSA_MASK (1 << 15) /* Manual start enb */
21 #define ZYNQ_SPI_CR_MCS_MASK (1 << 14) /* Manual chip select */
22 #define ZYNQ_SPI_CR_CS_MASK (0xF << 10) /* Chip select */
23 #define ZYNQ_SPI_CR_BRD_MASK (0x7 << 3) /* Baud rate div */
24 #define ZYNQ_SPI_CR_CPHA_MASK (1 << 2) /* Clock phase */
25 #define ZYNQ_SPI_CR_CPOL_MASK (1 << 1) /* Clock polarity */
26 #define ZYNQ_SPI_CR_MSTREN_MASK (1 << 0) /* Mode select */
27 #define ZYNQ_SPI_IXR_RXNEMPTY_MASK (1 << 4) /* RX_FIFO_not_empty */
28 #define ZYNQ_SPI_IXR_TXOW_MASK (1 << 2) /* TX_FIFO_not_full */
29 #define ZYNQ_SPI_IXR_ALL_MASK 0x7F /* All IXR bits */
30 #define ZYNQ_SPI_ENR_SPI_EN_MASK (1 << 0) /* SPI Enable */
32 #define ZYNQ_SPI_FIFO_DEPTH 128
33 #ifndef CONFIG_SYS_ZYNQ_SPI_WAIT
34 #define CONFIG_SYS_ZYNQ_SPI_WAIT (CONFIG_SYS_HZ/100) /* 10 ms */
37 /* zynq spi register set */
38 struct zynq_spi_regs {
51 /* zynq spi platform data */
52 struct zynq_spi_platdata {
53 struct zynq_spi_regs *regs;
54 u32 frequency; /* input frequency */
59 struct zynq_spi_priv {
60 struct zynq_spi_regs *regs;
63 u32 freq; /* required frequency */
66 static inline struct zynq_spi_regs *get_zynq_spi_regs(struct udevice *bus)
69 return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR1;
71 return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR0;
74 static int zynq_spi_ofdata_to_platdata(struct udevice *bus)
76 struct zynq_spi_platdata *plat = bus->platdata;
78 plat->regs = get_zynq_spi_regs(bus);
79 plat->frequency = 166666700;
80 plat->speed_hz = plat->frequency / 2;
85 static void zynq_spi_init_hw(struct zynq_spi_priv *priv)
87 struct zynq_spi_regs *regs = priv->regs;
91 writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, ®s->enr);
93 /* Disable Interrupts */
94 writel(ZYNQ_SPI_IXR_ALL_MASK, ®s->idr);
97 while (readl(®s->isr) &
98 ZYNQ_SPI_IXR_RXNEMPTY_MASK)
101 /* Clear Interrupts */
102 writel(ZYNQ_SPI_IXR_ALL_MASK, ®s->isr);
104 /* Manual slave select and Auto start */
105 confr = ZYNQ_SPI_CR_MCS_MASK | ZYNQ_SPI_CR_CS_MASK |
106 ZYNQ_SPI_CR_MSTREN_MASK;
107 confr &= ~ZYNQ_SPI_CR_MSA_MASK;
108 writel(confr, ®s->cr);
111 writel(ZYNQ_SPI_ENR_SPI_EN_MASK, ®s->enr);
114 static int zynq_spi_probe(struct udevice *bus)
116 struct zynq_spi_platdata *plat = dev_get_platdata(bus);
117 struct zynq_spi_priv *priv = dev_get_priv(bus);
119 priv->regs = plat->regs;
120 priv->fifo_depth = ZYNQ_SPI_FIFO_DEPTH;
122 /* init the zynq spi hw */
123 zynq_spi_init_hw(priv);
128 static void spi_cs_activate(struct udevice *dev, uint cs)
130 struct udevice *bus = dev->parent;
131 struct zynq_spi_priv *priv = dev_get_priv(bus);
132 struct zynq_spi_regs *regs = priv->regs;
135 clrbits_le32(®s->cr, ZYNQ_SPI_CR_CS_MASK);
136 cr = readl(®s->cr);
138 * CS cal logic: CS[13:10]
143 cr |= (~(0x1 << cs) << 10) & ZYNQ_SPI_CR_CS_MASK;
144 writel(cr, ®s->cr);
147 static void spi_cs_deactivate(struct udevice *dev)
149 struct udevice *bus = dev->parent;
150 struct zynq_spi_priv *priv = dev_get_priv(bus);
151 struct zynq_spi_regs *regs = priv->regs;
153 setbits_le32(®s->cr, ZYNQ_SPI_CR_CS_MASK);
156 static int zynq_spi_claim_bus(struct udevice *dev)
158 struct udevice *bus = dev->parent;
159 struct zynq_spi_priv *priv = dev_get_priv(bus);
160 struct zynq_spi_regs *regs = priv->regs;
162 writel(ZYNQ_SPI_ENR_SPI_EN_MASK, ®s->enr);
167 static int zynq_spi_release_bus(struct udevice *dev)
169 struct udevice *bus = dev->parent;
170 struct zynq_spi_priv *priv = dev_get_priv(bus);
171 struct zynq_spi_regs *regs = priv->regs;
173 writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, ®s->enr);
178 static int zynq_spi_xfer(struct udevice *dev, unsigned int bitlen,
179 const void *dout, void *din, unsigned long flags)
181 struct udevice *bus = dev->parent;
182 struct zynq_spi_priv *priv = dev_get_priv(bus);
183 struct zynq_spi_regs *regs = priv->regs;
184 struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
185 u32 len = bitlen / 8;
186 u32 tx_len = len, rx_len = len, tx_tvl;
187 const u8 *tx_buf = dout;
188 u8 *rx_buf = din, buf;
191 debug("spi_xfer: bus:%i cs:%i bitlen:%i len:%i flags:%lx\n",
192 bus->seq, slave_plat->cs, bitlen, len, flags);
195 debug("spi_xfer: Non byte aligned SPI transfer\n");
199 if (flags & SPI_XFER_BEGIN)
200 spi_cs_activate(dev, slave_plat->cs);
203 /* Write the data into TX FIFO - tx threshold is fifo_depth */
205 while ((tx_tvl < priv->fifo_depth) && tx_len) {
210 writel(buf, ®s->txdr);
215 /* Check TX FIFO completion */
217 status = readl(®s->isr);
218 while (!(status & ZYNQ_SPI_IXR_TXOW_MASK)) {
219 if (get_timer(ts) > CONFIG_SYS_ZYNQ_SPI_WAIT) {
220 printf("spi_xfer: Timeout! TX FIFO not full\n");
223 status = readl(®s->isr);
226 /* Read the data from RX FIFO */
227 status = readl(®s->isr);
228 while (status & ZYNQ_SPI_IXR_RXNEMPTY_MASK) {
229 buf = readl(®s->rxdr);
232 status = readl(®s->isr);
237 if (flags & SPI_XFER_END)
238 spi_cs_deactivate(dev);
243 static int zynq_spi_set_speed(struct udevice *bus, uint speed)
245 struct zynq_spi_platdata *plat = bus->platdata;
246 struct zynq_spi_priv *priv = dev_get_priv(bus);
247 struct zynq_spi_regs *regs = priv->regs;
249 u8 baud_rate_val = 0;
251 if (speed > plat->frequency)
252 speed = plat->frequency;
254 /* Set the clock frequency */
255 confr = readl(®s->cr);
257 /* Set baudrate x8, if the freq is 0 */
259 } else if (plat->speed_hz != speed) {
260 while ((baud_rate_val < 8) &&
262 (2 << baud_rate_val)) > speed))
264 plat->speed_hz = speed / (2 << baud_rate_val);
266 confr &= ~ZYNQ_SPI_CR_BRD_MASK;
267 confr |= (baud_rate_val << 3);
269 writel(confr, ®s->cr);
272 debug("zynq_spi_set_speed: regs=%p, mode=%d\n", priv->regs, priv->freq);
277 static int zynq_spi_set_mode(struct udevice *bus, uint mode)
279 struct zynq_spi_priv *priv = dev_get_priv(bus);
280 struct zynq_spi_regs *regs = priv->regs;
283 /* Set the SPI Clock phase and polarities */
284 confr = readl(®s->cr);
285 confr &= ~(ZYNQ_SPI_CR_CPHA_MASK | ZYNQ_SPI_CR_CPOL_MASK);
287 if (priv->mode & SPI_CPHA)
288 confr |= ZYNQ_SPI_CR_CPHA_MASK;
289 if (priv->mode & SPI_CPOL)
290 confr |= ZYNQ_SPI_CR_CPOL_MASK;
292 writel(confr, ®s->cr);
295 debug("zynq_spi_set_mode: regs=%p, mode=%d\n", priv->regs, priv->mode);
300 static const struct dm_spi_ops zynq_spi_ops = {
301 .claim_bus = zynq_spi_claim_bus,
302 .release_bus = zynq_spi_release_bus,
303 .xfer = zynq_spi_xfer,
304 .set_speed = zynq_spi_set_speed,
305 .set_mode = zynq_spi_set_mode,
308 static const struct udevice_id zynq_spi_ids[] = {
309 { .compatible = "xlnx,zynq-spi" },
313 U_BOOT_DRIVER(zynq_spi) = {
316 .of_match = zynq_spi_ids,
317 .ops = &zynq_spi_ops,
318 .ofdata_to_platdata = zynq_spi_ofdata_to_platdata,
319 .platdata_auto_alloc_size = sizeof(struct zynq_spi_platdata),
320 .priv_auto_alloc_size = sizeof(struct zynq_spi_priv),
321 .probe = zynq_spi_probe,