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.
24 * [0]: http://www.xilinx.com/support/documentation
26 * Xilinx SPI Register Definitions
27 * [1]: [0]/ip_documentation/xps_spi.pdf
28 * page 8, Register Descriptions
29 * [2]: [0]/ip_documentation/axi_spi_ds742.pdf
30 * page 7, Register Overview Table
33 /* SPI Control Register (spicr), [1] p9, [2] p8 */
34 #define SPICR_LSB_FIRST BIT(9)
35 #define SPICR_MASTER_INHIBIT BIT(8)
36 #define SPICR_MANUAL_SS BIT(7)
37 #define SPICR_RXFIFO_RESEST BIT(6)
38 #define SPICR_TXFIFO_RESEST BIT(5)
39 #define SPICR_CPHA BIT(4)
40 #define SPICR_CPOL BIT(3)
41 #define SPICR_MASTER_MODE BIT(2)
42 #define SPICR_SPE BIT(1)
43 #define SPICR_LOOP BIT(0)
45 /* SPI Status Register (spisr), [1] p11, [2] p10 */
46 #define SPISR_SLAVE_MODE_SELECT BIT(5)
47 #define SPISR_MODF BIT(4)
48 #define SPISR_TX_FULL BIT(3)
49 #define SPISR_TX_EMPTY BIT(2)
50 #define SPISR_RX_FULL BIT(1)
51 #define SPISR_RX_EMPTY BIT(0)
53 /* SPI Data Transmit Register (spidtr), [1] p12, [2] p12 */
54 #define SPIDTR_8BIT_MASK GENMASK(7, 0)
55 #define SPIDTR_16BIT_MASK GENMASK(15, 0)
56 #define SPIDTR_32BIT_MASK GENMASK(31, 0)
58 /* SPI Data Receive Register (spidrr), [1] p12, [2] p12 */
59 #define SPIDRR_8BIT_MASK GENMASK(7, 0)
60 #define SPIDRR_16BIT_MASK GENMASK(15, 0)
61 #define SPIDRR_32BIT_MASK GENMASK(31, 0)
63 /* SPI Slave Select Register (spissr), [1] p13, [2] p13 */
64 #define SPISSR_MASK(cs) (1 << (cs))
65 #define SPISSR_ACT(cs) ~SPISSR_MASK(cs)
66 #define SPISSR_OFF ~0UL
68 /* SPI Software Reset Register (ssr) */
69 #define SPISSR_RESET_VALUE 0x0a
71 #define XILSPI_MAX_XFER_BITS 8
72 #define XILSPI_SPICR_DFLT_ON (SPICR_MANUAL_SS | SPICR_MASTER_MODE | \
74 #define XILSPI_SPICR_DFLT_OFF (SPICR_MASTER_INHIBIT | SPICR_MANUAL_SS)
76 #ifndef CONFIG_XILINX_SPI_IDLE_VAL
77 #define CONFIG_XILINX_SPI_IDLE_VAL GENMASK(7, 0)
80 /* xilinx spi register set */
81 struct xilinx_spi_regs {
83 u32 dgier; /* Device Global Interrupt Enable Register (DGIER) */
84 u32 ipisr; /* IP Interrupt Status Register (IPISR) */
86 u32 ipier; /* IP Interrupt Enable Register (IPIER) */
88 u32 srr; /* Softare Reset Register (SRR) */
90 u32 spicr; /* SPI Control Register (SPICR) */
91 u32 spisr; /* SPI Status Register (SPISR) */
92 u32 spidtr; /* SPI Data Transmit Register (SPIDTR) */
93 u32 spidrr; /* SPI Data Receive Register (SPIDRR) */
94 u32 spissr; /* SPI Slave Select Register (SPISSR) */
95 u32 spitfor; /* SPI Transmit FIFO Occupancy Register (SPITFOR) */
96 u32 spirfor; /* SPI Receive FIFO Occupancy Register (SPIRFOR) */
100 struct xilinx_spi_priv {
101 struct xilinx_spi_regs *regs;
106 static int xilinx_spi_probe(struct udevice *bus)
108 struct xilinx_spi_priv *priv = dev_get_priv(bus);
109 struct xilinx_spi_regs *regs = priv->regs;
111 priv->regs = (struct xilinx_spi_regs *)devfdt_get_addr(bus);
113 writel(SPISSR_RESET_VALUE, ®s->srr);
118 static void spi_cs_activate(struct udevice *dev, uint cs)
120 struct udevice *bus = dev_get_parent(dev);
121 struct xilinx_spi_priv *priv = dev_get_priv(bus);
122 struct xilinx_spi_regs *regs = priv->regs;
124 writel(SPISSR_ACT(cs), ®s->spissr);
127 static void spi_cs_deactivate(struct udevice *dev)
129 struct udevice *bus = dev_get_parent(dev);
130 struct xilinx_spi_priv *priv = dev_get_priv(bus);
131 struct xilinx_spi_regs *regs = priv->regs;
133 writel(SPISSR_OFF, ®s->spissr);
136 static int xilinx_spi_claim_bus(struct udevice *dev)
138 struct udevice *bus = dev_get_parent(dev);
139 struct xilinx_spi_priv *priv = dev_get_priv(bus);
140 struct xilinx_spi_regs *regs = priv->regs;
142 writel(SPISSR_OFF, ®s->spissr);
143 writel(XILSPI_SPICR_DFLT_ON, ®s->spicr);
148 static int xilinx_spi_release_bus(struct udevice *dev)
150 struct udevice *bus = dev_get_parent(dev);
151 struct xilinx_spi_priv *priv = dev_get_priv(bus);
152 struct xilinx_spi_regs *regs = priv->regs;
154 writel(SPISSR_OFF, ®s->spissr);
155 writel(XILSPI_SPICR_DFLT_OFF, ®s->spicr);
160 static int xilinx_spi_xfer(struct udevice *dev, unsigned int bitlen,
161 const void *dout, void *din, unsigned long flags)
163 struct udevice *bus = dev_get_parent(dev);
164 struct xilinx_spi_priv *priv = dev_get_priv(bus);
165 struct xilinx_spi_regs *regs = priv->regs;
166 struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
167 /* assume spi core configured to do 8 bit transfers */
168 unsigned int bytes = bitlen / XILSPI_MAX_XFER_BITS;
169 const unsigned char *txp = dout;
170 unsigned char *rxp = din;
171 unsigned rxecount = 17; /* max. 16 elements in FIFO, leftover 1 */
172 unsigned global_timeout;
174 debug("spi_xfer: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n",
175 bus->seq, slave_plat->cs, bitlen, bytes, flags);
180 if (bitlen % XILSPI_MAX_XFER_BITS) {
181 printf("XILSPI warning: Not a multiple of %d bits\n",
182 XILSPI_MAX_XFER_BITS);
183 flags |= SPI_XFER_END;
187 /* empty read buffer */
188 while (rxecount && !(readl(®s->spisr) & SPISR_RX_EMPTY)) {
189 readl(®s->spidrr);
194 printf("XILSPI error: Rx buffer not empty\n");
198 if (flags & SPI_XFER_BEGIN)
199 spi_cs_activate(dev, slave_plat->cs);
201 /* at least 1usec or greater, leftover 1 */
202 global_timeout = priv->freq > XILSPI_MAX_XFER_BITS * 1000000 ? 2 :
203 (XILSPI_MAX_XFER_BITS * 1000000 / priv->freq) + 1;
206 unsigned timeout = global_timeout;
207 /* get Tx element from data out buffer and count up */
208 unsigned char d = txp ? *txp++ : CONFIG_XILINX_SPI_IDLE_VAL;
209 debug("spi_xfer: tx:%x ", d);
211 /* write out and wait for processing (receive data) */
212 writel(d & SPIDTR_8BIT_MASK, ®s->spidtr);
213 while (timeout && readl(®s->spisr)
220 printf("XILSPI error: Xfer timeout\n");
224 /* read Rx element and push into data in buffer */
225 d = readl(®s->spidrr) & SPIDRR_8BIT_MASK;
228 debug("spi_xfer: rx:%x\n", d);
232 if (flags & SPI_XFER_END)
233 spi_cs_deactivate(dev);
238 static int xilinx_spi_set_speed(struct udevice *bus, uint speed)
240 struct xilinx_spi_priv *priv = dev_get_priv(bus);
244 debug("xilinx_spi_set_speed: regs=%p, speed=%d\n", priv->regs,
250 static int xilinx_spi_set_mode(struct udevice *bus, uint mode)
252 struct xilinx_spi_priv *priv = dev_get_priv(bus);
253 struct xilinx_spi_regs *regs = priv->regs;
256 spicr = readl(®s->spicr);
257 if (mode & SPI_LSB_FIRST)
258 spicr |= SPICR_LSB_FIRST;
266 writel(spicr, ®s->spicr);
269 debug("xilinx_spi_set_mode: regs=%p, mode=%d\n", priv->regs,
275 static const struct dm_spi_ops xilinx_spi_ops = {
276 .claim_bus = xilinx_spi_claim_bus,
277 .release_bus = xilinx_spi_release_bus,
278 .xfer = xilinx_spi_xfer,
279 .set_speed = xilinx_spi_set_speed,
280 .set_mode = xilinx_spi_set_mode,
283 static const struct udevice_id xilinx_spi_ids[] = {
284 { .compatible = "xlnx,xps-spi-2.00.a" },
285 { .compatible = "xlnx,xps-spi-2.00.b" },
289 U_BOOT_DRIVER(xilinx_spi) = {
290 .name = "xilinx_spi",
292 .of_match = xilinx_spi_ids,
293 .ops = &xilinx_spi_ops,
294 .priv_auto_alloc_size = sizeof(struct xilinx_spi_priv),
295 .probe = xilinx_spi_probe,