1 // SPDX-License-Identifier: GPL-2.0+
5 * Supports 8 bit SPI transfers only, with or w/o FIFO
7 * Based on bfin_spi.c, by way of altera_spi.c
8 * Copyright (c) 2015 Jagan Teki <jteki@openedev.com>
9 * Copyright (c) 2012 Stephan Linz <linz@li-pro.net>
10 * Copyright (c) 2010 Graeme Smecher <graeme.smecher@mail.mcgill.ca>
11 * Copyright (c) 2010 Thomas Chou <thomas@wytron.com.tw>
12 * Copyright (c) 2005-2008 Analog Devices Inc.
25 * [0]: http://www.xilinx.com/support/documentation
27 * Xilinx SPI Register Definitions
28 * [1]: [0]/ip_documentation/xps_spi.pdf
29 * page 8, Register Descriptions
30 * [2]: [0]/ip_documentation/axi_spi_ds742.pdf
31 * page 7, Register Overview Table
34 /* SPI Control Register (spicr), [1] p9, [2] p8 */
35 #define SPICR_LSB_FIRST BIT(9)
36 #define SPICR_MASTER_INHIBIT BIT(8)
37 #define SPICR_MANUAL_SS BIT(7)
38 #define SPICR_RXFIFO_RESEST BIT(6)
39 #define SPICR_TXFIFO_RESEST BIT(5)
40 #define SPICR_CPHA BIT(4)
41 #define SPICR_CPOL BIT(3)
42 #define SPICR_MASTER_MODE BIT(2)
43 #define SPICR_SPE BIT(1)
44 #define SPICR_LOOP BIT(0)
46 /* SPI Status Register (spisr), [1] p11, [2] p10 */
47 #define SPISR_SLAVE_MODE_SELECT BIT(5)
48 #define SPISR_MODF BIT(4)
49 #define SPISR_TX_FULL BIT(3)
50 #define SPISR_TX_EMPTY BIT(2)
51 #define SPISR_RX_FULL BIT(1)
52 #define SPISR_RX_EMPTY BIT(0)
54 /* SPI Data Transmit Register (spidtr), [1] p12, [2] p12 */
55 #define SPIDTR_8BIT_MASK GENMASK(7, 0)
56 #define SPIDTR_16BIT_MASK GENMASK(15, 0)
57 #define SPIDTR_32BIT_MASK GENMASK(31, 0)
59 /* SPI Data Receive Register (spidrr), [1] p12, [2] p12 */
60 #define SPIDRR_8BIT_MASK GENMASK(7, 0)
61 #define SPIDRR_16BIT_MASK GENMASK(15, 0)
62 #define SPIDRR_32BIT_MASK GENMASK(31, 0)
64 /* SPI Slave Select Register (spissr), [1] p13, [2] p13 */
65 #define SPISSR_MASK(cs) (1 << (cs))
66 #define SPISSR_ACT(cs) ~SPISSR_MASK(cs)
67 #define SPISSR_OFF ~0UL
69 /* SPI Software Reset Register (ssr) */
70 #define SPISSR_RESET_VALUE 0x0a
72 #define XILSPI_MAX_XFER_BITS 8
73 #define XILSPI_SPICR_DFLT_ON (SPICR_MANUAL_SS | SPICR_MASTER_MODE | \
75 #define XILSPI_SPICR_DFLT_OFF (SPICR_MASTER_INHIBIT | SPICR_MANUAL_SS)
77 #ifndef CONFIG_XILINX_SPI_IDLE_VAL
78 #define CONFIG_XILINX_SPI_IDLE_VAL GENMASK(7, 0)
81 #define XILINX_SPISR_TIMEOUT 10000 /* in milliseconds */
83 /* xilinx spi register set */
84 struct xilinx_spi_regs {
86 u32 dgier; /* Device Global Interrupt Enable Register (DGIER) */
87 u32 ipisr; /* IP Interrupt Status Register (IPISR) */
89 u32 ipier; /* IP Interrupt Enable Register (IPIER) */
91 u32 srr; /* Softare Reset Register (SRR) */
93 u32 spicr; /* SPI Control Register (SPICR) */
94 u32 spisr; /* SPI Status Register (SPISR) */
95 u32 spidtr; /* SPI Data Transmit Register (SPIDTR) */
96 u32 spidrr; /* SPI Data Receive Register (SPIDRR) */
97 u32 spissr; /* SPI Slave Select Register (SPISSR) */
98 u32 spitfor; /* SPI Transmit FIFO Occupancy Register (SPITFOR) */
99 u32 spirfor; /* SPI Receive FIFO Occupancy Register (SPIRFOR) */
102 /* xilinx spi priv */
103 struct xilinx_spi_priv {
104 struct xilinx_spi_regs *regs;
107 unsigned int fifo_depth;
111 static int xilinx_spi_probe(struct udevice *bus)
113 struct xilinx_spi_priv *priv = dev_get_priv(bus);
114 struct xilinx_spi_regs *regs = priv->regs;
116 priv->regs = (struct xilinx_spi_regs *)devfdt_get_addr(bus);
118 priv->fifo_depth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(bus),
121 writel(SPISSR_RESET_VALUE, ®s->srr);
126 static void spi_cs_activate(struct udevice *dev, uint cs)
128 struct udevice *bus = dev_get_parent(dev);
129 struct xilinx_spi_priv *priv = dev_get_priv(bus);
130 struct xilinx_spi_regs *regs = priv->regs;
132 writel(SPISSR_ACT(cs), ®s->spissr);
135 static void spi_cs_deactivate(struct udevice *dev)
137 struct udevice *bus = dev_get_parent(dev);
138 struct xilinx_spi_priv *priv = dev_get_priv(bus);
139 struct xilinx_spi_regs *regs = priv->regs;
141 writel(SPISSR_OFF, ®s->spissr);
144 static int xilinx_spi_claim_bus(struct udevice *dev)
146 struct udevice *bus = dev_get_parent(dev);
147 struct xilinx_spi_priv *priv = dev_get_priv(bus);
148 struct xilinx_spi_regs *regs = priv->regs;
150 writel(SPISSR_OFF, ®s->spissr);
151 writel(XILSPI_SPICR_DFLT_ON, ®s->spicr);
156 static int xilinx_spi_release_bus(struct udevice *dev)
158 struct udevice *bus = dev_get_parent(dev);
159 struct xilinx_spi_priv *priv = dev_get_priv(bus);
160 struct xilinx_spi_regs *regs = priv->regs;
162 writel(SPISSR_OFF, ®s->spissr);
163 writel(XILSPI_SPICR_DFLT_OFF, ®s->spicr);
168 static u32 xilinx_spi_fill_txfifo(struct udevice *bus, const u8 *txp,
171 struct xilinx_spi_priv *priv = dev_get_priv(bus);
172 struct xilinx_spi_regs *regs = priv->regs;
176 while (txbytes && !(readl(®s->spisr) & SPISR_TX_FULL) &&
177 i < priv->fifo_depth) {
178 d = txp ? *txp++ : CONFIG_XILINX_SPI_IDLE_VAL;
179 debug("spi_xfer: tx:%x ", d);
180 /* write out and wait for processing (receive data) */
181 writel(d & SPIDTR_8BIT_MASK, ®s->spidtr);
189 static u32 xilinx_spi_read_rxfifo(struct udevice *bus, u8 *rxp, u32 rxbytes)
191 struct xilinx_spi_priv *priv = dev_get_priv(bus);
192 struct xilinx_spi_regs *regs = priv->regs;
196 while (rxbytes && !(readl(®s->spisr) & SPISR_RX_EMPTY)) {
197 d = readl(®s->spidrr) & SPIDRR_8BIT_MASK;
200 debug("spi_xfer: rx:%x\n", d);
209 static void xilinx_spi_startup_block(struct udevice *dev, unsigned int bytes,
210 const void *dout, void *din)
212 struct udevice *bus = dev_get_parent(dev);
213 struct xilinx_spi_priv *priv = dev_get_priv(bus);
214 struct xilinx_spi_regs *regs = priv->regs;
215 struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
216 const unsigned char *txp = dout;
217 unsigned char *rxp = din;
223 * This loop runs two times. First time to send the command.
224 * Second time to transfer data. After transferring data,
225 * it sets txp to the initial value for the normal operation.
227 for ( ; priv->startup < 2; priv->startup++) {
228 count = xilinx_spi_fill_txfifo(bus, txp, txbytes);
229 reg = readl(®s->spicr) & ~SPICR_MASTER_INHIBIT;
230 writel(reg, ®s->spicr);
231 count = xilinx_spi_read_rxfifo(bus, rxp, rxbytes);
235 spi_cs_deactivate(dev);
236 spi_cs_activate(dev, slave_plat->cs);
242 static int xilinx_spi_xfer(struct udevice *dev, unsigned int bitlen,
243 const void *dout, void *din, unsigned long flags)
245 struct udevice *bus = dev_get_parent(dev);
246 struct xilinx_spi_priv *priv = dev_get_priv(bus);
247 struct xilinx_spi_regs *regs = priv->regs;
248 struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
249 /* assume spi core configured to do 8 bit transfers */
250 unsigned int bytes = bitlen / XILSPI_MAX_XFER_BITS;
251 const unsigned char *txp = dout;
252 unsigned char *rxp = din;
255 u32 reg, count, timeout;
258 debug("spi_xfer: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n",
259 bus->seq, slave_plat->cs, bitlen, bytes, flags);
264 if (bitlen % XILSPI_MAX_XFER_BITS) {
265 printf("XILSPI warning: Not a multiple of %d bits\n",
266 XILSPI_MAX_XFER_BITS);
267 flags |= SPI_XFER_END;
271 if (flags & SPI_XFER_BEGIN)
272 spi_cs_activate(dev, slave_plat->cs);
275 * This is the work around for the startup block issue in
276 * the spi controller. SPI clock is passing through STARTUP
277 * block to FLASH. STARTUP block don't provide clock as soon
278 * as QSPI provides command. So first command fails.
280 xilinx_spi_startup_block(dev, bytes, dout, din);
282 while (txbytes && rxbytes) {
283 count = xilinx_spi_fill_txfifo(bus, txp, txbytes);
284 reg = readl(®s->spicr) & ~SPICR_MASTER_INHIBIT;
285 writel(reg, ®s->spicr);
290 ret = wait_for_bit_le32(®s->spisr, SPISR_TX_EMPTY, true,
291 XILINX_SPISR_TIMEOUT, false);
293 printf("XILSPI error: Xfer timeout\n");
297 debug("txbytes:0x%x,txp:0x%p\n", txbytes, txp);
298 count = xilinx_spi_read_rxfifo(bus, rxp, rxbytes);
302 debug("rxbytes:0x%x rxp:0x%p\n", rxbytes, rxp);
306 if (flags & SPI_XFER_END)
307 spi_cs_deactivate(dev);
312 static int xilinx_spi_set_speed(struct udevice *bus, uint speed)
314 struct xilinx_spi_priv *priv = dev_get_priv(bus);
318 debug("xilinx_spi_set_speed: regs=%p, speed=%d\n", priv->regs,
324 static int xilinx_spi_set_mode(struct udevice *bus, uint mode)
326 struct xilinx_spi_priv *priv = dev_get_priv(bus);
327 struct xilinx_spi_regs *regs = priv->regs;
330 spicr = readl(®s->spicr);
331 if (mode & SPI_LSB_FIRST)
332 spicr |= SPICR_LSB_FIRST;
340 writel(spicr, ®s->spicr);
343 debug("xilinx_spi_set_mode: regs=%p, mode=%d\n", priv->regs,
349 static const struct dm_spi_ops xilinx_spi_ops = {
350 .claim_bus = xilinx_spi_claim_bus,
351 .release_bus = xilinx_spi_release_bus,
352 .xfer = xilinx_spi_xfer,
353 .set_speed = xilinx_spi_set_speed,
354 .set_mode = xilinx_spi_set_mode,
357 static const struct udevice_id xilinx_spi_ids[] = {
358 { .compatible = "xlnx,xps-spi-2.00.a" },
359 { .compatible = "xlnx,xps-spi-2.00.b" },
363 U_BOOT_DRIVER(xilinx_spi) = {
364 .name = "xilinx_spi",
366 .of_match = xilinx_spi_ids,
367 .ops = &xilinx_spi_ops,
368 .priv_auto_alloc_size = sizeof(struct xilinx_spi_priv),
369 .probe = xilinx_spi_probe,