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Tom Warren4e675ff2015-10-12 14:50:54 -07001/*
2 * NVIDIA Tegra210 QSPI controller driver
3 *
4 * (C) Copyright 2015 NVIDIA Corporation <www.nvidia.com>
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
8
9#include <common.h>
10#include <dm.h>
11#include <asm/io.h>
12#include <asm/arch/clock.h>
13#include <asm/arch-tegra/clk_rst.h>
14#include <spi.h>
15#include <fdtdec.h>
16#include "tegra_spi.h"
17
18DECLARE_GLOBAL_DATA_PTR;
19
20/* COMMAND1 */
21#define QSPI_CMD1_GO BIT(31)
22#define QSPI_CMD1_M_S BIT(30)
23#define QSPI_CMD1_MODE_MASK GENMASK(1,0)
24#define QSPI_CMD1_MODE_SHIFT 28
25#define QSPI_CMD1_CS_SEL_MASK GENMASK(1,0)
26#define QSPI_CMD1_CS_SEL_SHIFT 26
27#define QSPI_CMD1_CS_POL_INACTIVE0 BIT(22)
28#define QSPI_CMD1_CS_SW_HW BIT(21)
29#define QSPI_CMD1_CS_SW_VAL BIT(20)
30#define QSPI_CMD1_IDLE_SDA_MASK GENMASK(1,0)
31#define QSPI_CMD1_IDLE_SDA_SHIFT 18
32#define QSPI_CMD1_BIDIR BIT(17)
33#define QSPI_CMD1_LSBI_FE BIT(16)
34#define QSPI_CMD1_LSBY_FE BIT(15)
35#define QSPI_CMD1_BOTH_EN_BIT BIT(14)
36#define QSPI_CMD1_BOTH_EN_BYTE BIT(13)
37#define QSPI_CMD1_RX_EN BIT(12)
38#define QSPI_CMD1_TX_EN BIT(11)
39#define QSPI_CMD1_PACKED BIT(5)
40#define QSPI_CMD1_BITLEN_MASK GENMASK(4,0)
41#define QSPI_CMD1_BITLEN_SHIFT 0
42
43/* COMMAND2 */
44#define QSPI_CMD2_TX_CLK_TAP_DELAY BIT(6)
45#define QSPI_CMD2_TX_CLK_TAP_DELAY_MASK GENMASK(11,6)
46#define QSPI_CMD2_RX_CLK_TAP_DELAY BIT(0)
47#define QSPI_CMD2_RX_CLK_TAP_DELAY_MASK GENMASK(5,0)
48
49/* TRANSFER STATUS */
50#define QSPI_XFER_STS_RDY BIT(30)
51
52/* FIFO STATUS */
53#define QSPI_FIFO_STS_CS_INACTIVE BIT(31)
54#define QSPI_FIFO_STS_FRAME_END BIT(30)
55#define QSPI_FIFO_STS_RX_FIFO_FLUSH BIT(15)
56#define QSPI_FIFO_STS_TX_FIFO_FLUSH BIT(14)
57#define QSPI_FIFO_STS_ERR BIT(8)
58#define QSPI_FIFO_STS_TX_FIFO_OVF BIT(7)
59#define QSPI_FIFO_STS_TX_FIFO_UNR BIT(6)
60#define QSPI_FIFO_STS_RX_FIFO_OVF BIT(5)
61#define QSPI_FIFO_STS_RX_FIFO_UNR BIT(4)
62#define QSPI_FIFO_STS_TX_FIFO_FULL BIT(3)
63#define QSPI_FIFO_STS_TX_FIFO_EMPTY BIT(2)
64#define QSPI_FIFO_STS_RX_FIFO_FULL BIT(1)
65#define QSPI_FIFO_STS_RX_FIFO_EMPTY BIT(0)
66
67#define QSPI_TIMEOUT 1000
68
69struct qspi_regs {
70 u32 command1; /* 000:QSPI_COMMAND1 register */
71 u32 command2; /* 004:QSPI_COMMAND2 register */
72 u32 timing1; /* 008:QSPI_CS_TIM1 register */
73 u32 timing2; /* 00c:QSPI_CS_TIM2 register */
74 u32 xfer_status;/* 010:QSPI_TRANS_STATUS register */
75 u32 fifo_status;/* 014:QSPI_FIFO_STATUS register */
76 u32 tx_data; /* 018:QSPI_TX_DATA register */
77 u32 rx_data; /* 01c:QSPI_RX_DATA register */
78 u32 dma_ctl; /* 020:QSPI_DMA_CTL register */
79 u32 dma_blk; /* 024:QSPI_DMA_BLK register */
80 u32 rsvd[56]; /* 028-107 reserved */
81 u32 tx_fifo; /* 108:QSPI_FIFO1 register */
82 u32 rsvd2[31]; /* 10c-187 reserved */
83 u32 rx_fifo; /* 188:QSPI_FIFO2 register */
84 u32 spare_ctl; /* 18c:QSPI_SPARE_CTRL register */
85};
86
87struct tegra210_qspi_priv {
88 struct qspi_regs *regs;
89 unsigned int freq;
90 unsigned int mode;
91 int periph_id;
92 int valid;
93 int last_transaction_us;
94};
95
96static int tegra210_qspi_ofdata_to_platdata(struct udevice *bus)
97{
98 struct tegra_spi_platdata *plat = bus->platdata;
99 const void *blob = gd->fdt_blob;
Simon Glasse160f7d2017-01-17 16:52:55 -0700100 int node = dev_of_offset(bus);
Tom Warren4e675ff2015-10-12 14:50:54 -0700101
Simon Glassa821c4a2017-05-17 17:18:05 -0600102 plat->base = devfdt_get_addr(bus);
Tom Warren4e675ff2015-10-12 14:50:54 -0700103 plat->periph_id = clock_decode_periph_id(blob, node);
104
105 if (plat->periph_id == PERIPH_ID_NONE) {
106 debug("%s: could not decode periph id %d\n", __func__,
107 plat->periph_id);
108 return -FDT_ERR_NOTFOUND;
109 }
110
111 /* Use 500KHz as a suitable default */
112 plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
113 500000);
114 plat->deactivate_delay_us = fdtdec_get_int(blob, node,
115 "spi-deactivate-delay", 0);
116 debug("%s: base=%#08lx, periph_id=%d, max-frequency=%d, deactivate_delay=%d\n",
117 __func__, plat->base, plat->periph_id, plat->frequency,
118 plat->deactivate_delay_us);
119
120 return 0;
121}
122
123static int tegra210_qspi_probe(struct udevice *bus)
124{
125 struct tegra_spi_platdata *plat = dev_get_platdata(bus);
126 struct tegra210_qspi_priv *priv = dev_get_priv(bus);
127
128 priv->regs = (struct qspi_regs *)plat->base;
129
130 priv->last_transaction_us = timer_get_us();
131 priv->freq = plat->frequency;
132 priv->periph_id = plat->periph_id;
133
Stephen Warren4832c7f2016-08-18 10:53:33 -0600134 /* Change SPI clock to correct frequency, PLLP_OUT0 source */
135 clock_start_periph_pll(priv->periph_id, CLOCK_ID_PERIPH, priv->freq);
136
Tom Warren4e675ff2015-10-12 14:50:54 -0700137 return 0;
138}
139
140static int tegra210_qspi_claim_bus(struct udevice *bus)
141{
142 struct tegra210_qspi_priv *priv = dev_get_priv(bus);
143 struct qspi_regs *regs = priv->regs;
144
145 /* Change SPI clock to correct frequency, PLLP_OUT0 source */
146 clock_start_periph_pll(priv->periph_id, CLOCK_ID_PERIPH, priv->freq);
147
148 debug("%s: FIFO STATUS = %08x\n", __func__, readl(&regs->fifo_status));
149
150 /* Set master mode and sw controlled CS */
151 setbits_le32(&regs->command1, QSPI_CMD1_M_S | QSPI_CMD1_CS_SW_HW |
152 (priv->mode << QSPI_CMD1_MODE_SHIFT));
153 debug("%s: COMMAND1 = %08x\n", __func__, readl(&regs->command1));
154
155 return 0;
156}
157
158/**
159 * Activate the CS by driving it LOW
160 *
161 * @param slave Pointer to spi_slave to which controller has to
162 * communicate with
163 */
164static void spi_cs_activate(struct udevice *dev)
165{
166 struct udevice *bus = dev->parent;
167 struct tegra_spi_platdata *pdata = dev_get_platdata(bus);
168 struct tegra210_qspi_priv *priv = dev_get_priv(bus);
169
170 /* If it's too soon to do another transaction, wait */
171 if (pdata->deactivate_delay_us &&
172 priv->last_transaction_us) {
173 ulong delay_us; /* The delay completed so far */
174 delay_us = timer_get_us() - priv->last_transaction_us;
175 if (delay_us < pdata->deactivate_delay_us)
176 udelay(pdata->deactivate_delay_us - delay_us);
177 }
178
179 clrbits_le32(&priv->regs->command1, QSPI_CMD1_CS_SW_VAL);
180}
181
182/**
183 * Deactivate the CS by driving it HIGH
184 *
185 * @param slave Pointer to spi_slave to which controller has to
186 * communicate with
187 */
188static void spi_cs_deactivate(struct udevice *dev)
189{
190 struct udevice *bus = dev->parent;
191 struct tegra_spi_platdata *pdata = dev_get_platdata(bus);
192 struct tegra210_qspi_priv *priv = dev_get_priv(bus);
193
194 setbits_le32(&priv->regs->command1, QSPI_CMD1_CS_SW_VAL);
195
196 /* Remember time of this transaction so we can honour the bus delay */
197 if (pdata->deactivate_delay_us)
198 priv->last_transaction_us = timer_get_us();
199
200 debug("Deactivate CS, bus '%s'\n", bus->name);
201}
202
203static int tegra210_qspi_xfer(struct udevice *dev, unsigned int bitlen,
204 const void *data_out, void *data_in,
205 unsigned long flags)
206{
207 struct udevice *bus = dev->parent;
208 struct tegra210_qspi_priv *priv = dev_get_priv(bus);
209 struct qspi_regs *regs = priv->regs;
210 u32 reg, tmpdout, tmpdin = 0;
211 const u8 *dout = data_out;
212 u8 *din = data_in;
213 int num_bytes, tm, ret;
214
215 debug("%s: slave %u:%u dout %p din %p bitlen %u\n",
216 __func__, bus->seq, spi_chip_select(dev), dout, din, bitlen);
217 if (bitlen % 8)
218 return -1;
219 num_bytes = bitlen / 8;
220
221 ret = 0;
222
223 /* clear all error status bits */
224 reg = readl(&regs->fifo_status);
225 writel(reg, &regs->fifo_status);
226
227 /* flush RX/TX FIFOs */
228 setbits_le32(&regs->fifo_status,
229 (QSPI_FIFO_STS_RX_FIFO_FLUSH |
230 QSPI_FIFO_STS_TX_FIFO_FLUSH));
231
232 tm = QSPI_TIMEOUT;
233 while ((tm && readl(&regs->fifo_status) &
234 (QSPI_FIFO_STS_RX_FIFO_FLUSH |
235 QSPI_FIFO_STS_TX_FIFO_FLUSH))) {
236 tm--;
237 udelay(1);
238 }
239
240 if (!tm) {
241 printf("%s: timeout during QSPI FIFO flush!\n",
242 __func__);
243 return -1;
244 }
245
246 /*
247 * Notes:
248 * 1. don't set LSBY_FE, so no need to swap bytes from/to TX/RX FIFOs;
249 * 2. don't set RX_EN and TX_EN yet.
250 * (SW needs to make sure that while programming the blk_size,
251 * tx_en and rx_en bits must be zero)
252 * [TODO] I (Yen Lin) have problems when both RX/TX EN bits are set
253 * i.e., both dout and din are not NULL.
254 */
255 clrsetbits_le32(&regs->command1,
256 (QSPI_CMD1_LSBI_FE | QSPI_CMD1_LSBY_FE |
257 QSPI_CMD1_RX_EN | QSPI_CMD1_TX_EN),
258 (spi_chip_select(dev) << QSPI_CMD1_CS_SEL_SHIFT));
259
260 /* set xfer size to 1 block (32 bits) */
261 writel(0, &regs->dma_blk);
262
263 if (flags & SPI_XFER_BEGIN)
264 spi_cs_activate(dev);
265
266 /* handle data in 32-bit chunks */
267 while (num_bytes > 0) {
268 int bytes;
269
270 tmpdout = 0;
271 bytes = (num_bytes > 4) ? 4 : num_bytes;
272
273 if (dout != NULL) {
274 memcpy((void *)&tmpdout, (void *)dout, bytes);
275 dout += bytes;
276 num_bytes -= bytes;
277 writel(tmpdout, &regs->tx_fifo);
278 setbits_le32(&regs->command1, QSPI_CMD1_TX_EN);
279 }
280
281 if (din != NULL)
282 setbits_le32(&regs->command1, QSPI_CMD1_RX_EN);
283
284 /* clear ready bit */
285 setbits_le32(&regs->xfer_status, QSPI_XFER_STS_RDY);
286
287 clrsetbits_le32(&regs->command1,
288 QSPI_CMD1_BITLEN_MASK << QSPI_CMD1_BITLEN_SHIFT,
289 (bytes * 8 - 1) << QSPI_CMD1_BITLEN_SHIFT);
290
291 /* Need to stabilize other reg bits before GO bit set.
292 * As per the TRM:
293 * "For successful operation at various freq combinations,
294 * a minimum of 4-5 spi_clk cycle delay might be required
295 * before enabling the PIO or DMA bits. The worst case delay
296 * calculation can be done considering slowest qspi_clk as
297 * 1MHz. Based on that 1us delay should be enough before
298 * enabling PIO or DMA." Padded another 1us for safety.
299 */
300 udelay(2);
301 setbits_le32(&regs->command1, QSPI_CMD1_GO);
302 udelay(1);
303
304 /*
305 * Wait for SPI transmit FIFO to empty, or to time out.
306 * The RX FIFO status will be read and cleared last
307 */
308 for (tm = 0; tm < QSPI_TIMEOUT; ++tm) {
309 u32 fifo_status, xfer_status;
310
311 xfer_status = readl(&regs->xfer_status);
312 if (!(xfer_status & QSPI_XFER_STS_RDY))
313 continue;
314
315 fifo_status = readl(&regs->fifo_status);
316 if (fifo_status & QSPI_FIFO_STS_ERR) {
317 debug("%s: got a fifo error: ", __func__);
318 if (fifo_status & QSPI_FIFO_STS_TX_FIFO_OVF)
319 debug("tx FIFO overflow ");
320 if (fifo_status & QSPI_FIFO_STS_TX_FIFO_UNR)
321 debug("tx FIFO underrun ");
322 if (fifo_status & QSPI_FIFO_STS_RX_FIFO_OVF)
323 debug("rx FIFO overflow ");
324 if (fifo_status & QSPI_FIFO_STS_RX_FIFO_UNR)
325 debug("rx FIFO underrun ");
326 if (fifo_status & QSPI_FIFO_STS_TX_FIFO_FULL)
327 debug("tx FIFO full ");
328 if (fifo_status & QSPI_FIFO_STS_TX_FIFO_EMPTY)
329 debug("tx FIFO empty ");
330 if (fifo_status & QSPI_FIFO_STS_RX_FIFO_FULL)
331 debug("rx FIFO full ");
332 if (fifo_status & QSPI_FIFO_STS_RX_FIFO_EMPTY)
333 debug("rx FIFO empty ");
334 debug("\n");
335 break;
336 }
337
338 if (!(fifo_status & QSPI_FIFO_STS_RX_FIFO_EMPTY)) {
339 tmpdin = readl(&regs->rx_fifo);
340 if (din != NULL) {
341 memcpy(din, &tmpdin, bytes);
342 din += bytes;
343 num_bytes -= bytes;
344 }
345 }
346 break;
347 }
348
349 if (tm >= QSPI_TIMEOUT)
350 ret = tm;
351
352 /* clear ACK RDY, etc. bits */
353 writel(readl(&regs->fifo_status), &regs->fifo_status);
354 }
355
356 if (flags & SPI_XFER_END)
357 spi_cs_deactivate(dev);
358
359 debug("%s: transfer ended. Value=%08x, fifo_status = %08x\n",
360 __func__, tmpdin, readl(&regs->fifo_status));
361
362 if (ret) {
363 printf("%s: timeout during SPI transfer, tm %d\n",
364 __func__, ret);
365 return -1;
366 }
367
368 return ret;
369}
370
371static int tegra210_qspi_set_speed(struct udevice *bus, uint speed)
372{
373 struct tegra_spi_platdata *plat = bus->platdata;
374 struct tegra210_qspi_priv *priv = dev_get_priv(bus);
375
376 if (speed > plat->frequency)
377 speed = plat->frequency;
378 priv->freq = speed;
379 debug("%s: regs=%p, speed=%d\n", __func__, priv->regs, priv->freq);
380
381 return 0;
382}
383
384static int tegra210_qspi_set_mode(struct udevice *bus, uint mode)
385{
386 struct tegra210_qspi_priv *priv = dev_get_priv(bus);
387
388 priv->mode = mode;
389 debug("%s: regs=%p, mode=%d\n", __func__, priv->regs, priv->mode);
390
391 return 0;
392}
393
394static const struct dm_spi_ops tegra210_qspi_ops = {
395 .claim_bus = tegra210_qspi_claim_bus,
396 .xfer = tegra210_qspi_xfer,
397 .set_speed = tegra210_qspi_set_speed,
398 .set_mode = tegra210_qspi_set_mode,
399 /*
400 * cs_info is not needed, since we require all chip selects to be
401 * in the device tree explicitly
402 */
403};
404
405static const struct udevice_id tegra210_qspi_ids[] = {
406 { .compatible = "nvidia,tegra210-qspi" },
407 { }
408};
409
410U_BOOT_DRIVER(tegra210_qspi) = {
411 .name = "tegra210-qspi",
412 .id = UCLASS_SPI,
413 .of_match = tegra210_qspi_ids,
414 .ops = &tegra210_qspi_ops,
415 .ofdata_to_platdata = tegra210_qspi_ofdata_to_platdata,
416 .platdata_auto_alloc_size = sizeof(struct tegra_spi_platdata),
417 .priv_auto_alloc_size = sizeof(struct tegra210_qspi_priv),
418 .per_child_auto_alloc_size = sizeof(struct spi_slave),
419 .probe = tegra210_qspi_probe,
420};