1 // SPDX-License-Identifier: GPL-2.0+
4 * Freescale QuadSPI driver.
6 * Copyright (C) 2013 Freescale Semiconductor, Inc.
7 * Copyright (C) 2018 Bootlin
8 * Copyright (C) 2018 exceet electronics GmbH
9 * Copyright (C) 2018 Kontron Electronics GmbH
11 * Transition to SPI MEM interface:
13 * Boris Brezillon <bbrezillon@kernel.org>
14 * Frieder Schrempf <frieder.schrempf@kontron.de>
15 * Yogesh Gaur <yogeshnarayan.gaur@nxp.com>
16 * Suresh Gupta <suresh.gupta@nxp.com>
18 * Based on the original fsl-quadspi.c SPI NOR driver:
19 * Author: Freescale Semiconductor, Inc.
23 #include <linux/bitops.h>
24 #include <linux/clk.h>
25 #include <linux/completion.h>
26 #include <linux/delay.h>
27 #include <linux/err.h>
28 #include <linux/errno.h>
29 #include <linux/interrupt.h>
31 #include <linux/iopoll.h>
32 #include <linux/jiffies.h>
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/mutex.h>
37 #include <linux/platform_device.h>
38 #include <linux/pm_qos.h>
39 #include <linux/sizes.h>
41 #include <linux/spi/spi.h>
42 #include <linux/spi/spi-mem.h>
45 * The driver only uses one single LUT entry, that is updated on
46 * each call of exec_op(). Index 0 is preset at boot with a basic
47 * read operation, so let's use the last entry (15).
51 /* Registers used by the driver */
52 #define QUADSPI_MCR 0x00
53 #define QUADSPI_MCR_RESERVED_MASK GENMASK(19, 16)
54 #define QUADSPI_MCR_MDIS_MASK BIT(14)
55 #define QUADSPI_MCR_CLR_TXF_MASK BIT(11)
56 #define QUADSPI_MCR_CLR_RXF_MASK BIT(10)
57 #define QUADSPI_MCR_DDR_EN_MASK BIT(7)
58 #define QUADSPI_MCR_END_CFG_MASK GENMASK(3, 2)
59 #define QUADSPI_MCR_SWRSTHD_MASK BIT(1)
60 #define QUADSPI_MCR_SWRSTSD_MASK BIT(0)
62 #define QUADSPI_IPCR 0x08
63 #define QUADSPI_IPCR_SEQID(x) ((x) << 24)
65 #define QUADSPI_FLSHCR 0x0c
66 #define QUADSPI_FLSHCR_TCSS_MASK GENMASK(3, 0)
67 #define QUADSPI_FLSHCR_TCSH_MASK GENMASK(11, 8)
68 #define QUADSPI_FLSHCR_TDH_MASK GENMASK(17, 16)
70 #define QUADSPI_BUF0CR 0x10
71 #define QUADSPI_BUF1CR 0x14
72 #define QUADSPI_BUF2CR 0x18
73 #define QUADSPI_BUFXCR_INVALID_MSTRID 0xe
75 #define QUADSPI_BUF3CR 0x1c
76 #define QUADSPI_BUF3CR_ALLMST_MASK BIT(31)
77 #define QUADSPI_BUF3CR_ADATSZ(x) ((x) << 8)
78 #define QUADSPI_BUF3CR_ADATSZ_MASK GENMASK(15, 8)
80 #define QUADSPI_BFGENCR 0x20
81 #define QUADSPI_BFGENCR_SEQID(x) ((x) << 12)
83 #define QUADSPI_BUF0IND 0x30
84 #define QUADSPI_BUF1IND 0x34
85 #define QUADSPI_BUF2IND 0x38
86 #define QUADSPI_SFAR 0x100
88 #define QUADSPI_SMPR 0x108
89 #define QUADSPI_SMPR_DDRSMP_MASK GENMASK(18, 16)
90 #define QUADSPI_SMPR_FSDLY_MASK BIT(6)
91 #define QUADSPI_SMPR_FSPHS_MASK BIT(5)
92 #define QUADSPI_SMPR_HSENA_MASK BIT(0)
94 #define QUADSPI_RBCT 0x110
95 #define QUADSPI_RBCT_WMRK_MASK GENMASK(4, 0)
96 #define QUADSPI_RBCT_RXBRD_USEIPS BIT(8)
98 #define QUADSPI_TBDR 0x154
100 #define QUADSPI_SR 0x15c
101 #define QUADSPI_SR_IP_ACC_MASK BIT(1)
102 #define QUADSPI_SR_AHB_ACC_MASK BIT(2)
104 #define QUADSPI_FR 0x160
105 #define QUADSPI_FR_TFF_MASK BIT(0)
107 #define QUADSPI_RSER 0x164
108 #define QUADSPI_RSER_TFIE BIT(0)
110 #define QUADSPI_SPTRCLR 0x16c
111 #define QUADSPI_SPTRCLR_IPPTRC BIT(8)
112 #define QUADSPI_SPTRCLR_BFPTRC BIT(0)
114 #define QUADSPI_SFA1AD 0x180
115 #define QUADSPI_SFA2AD 0x184
116 #define QUADSPI_SFB1AD 0x188
117 #define QUADSPI_SFB2AD 0x18c
118 #define QUADSPI_RBDR(x) (0x200 + ((x) * 4))
120 #define QUADSPI_LUTKEY 0x300
121 #define QUADSPI_LUTKEY_VALUE 0x5AF05AF0
123 #define QUADSPI_LCKCR 0x304
124 #define QUADSPI_LCKER_LOCK BIT(0)
125 #define QUADSPI_LCKER_UNLOCK BIT(1)
127 #define QUADSPI_LUT_BASE 0x310
128 #define QUADSPI_LUT_OFFSET (SEQID_LUT * 4 * 4)
129 #define QUADSPI_LUT_REG(idx) \
130 (QUADSPI_LUT_BASE + QUADSPI_LUT_OFFSET + (idx) * 4)
132 /* Instruction set for the LUT register */
140 #define LUT_FSL_READ 7
141 #define LUT_FSL_WRITE 8
142 #define LUT_JMP_ON_CS 9
143 #define LUT_ADDR_DDR 10
144 #define LUT_MODE_DDR 11
145 #define LUT_MODE2_DDR 12
146 #define LUT_MODE4_DDR 13
147 #define LUT_FSL_READ_DDR 14
148 #define LUT_FSL_WRITE_DDR 15
149 #define LUT_DATA_LEARN 16
152 * The PAD definitions for LUT register.
154 * The pad stands for the number of IO lines [0:3].
155 * For example, the quad read needs four IO lines,
156 * so you should use LUT_PAD(4).
158 #define LUT_PAD(x) (fls(x) - 1)
161 * Macro for constructing the LUT entries with the following
164 * ---------------------------------------------------
165 * | INSTR1 | PAD1 | OPRND1 | INSTR0 | PAD0 | OPRND0 |
166 * ---------------------------------------------------
168 #define LUT_DEF(idx, ins, pad, opr) \
169 ((((ins) << 10) | ((pad) << 8) | (opr)) << (((idx) % 2) * 16))
171 /* Controller needs driver to swap endianness */
172 #define QUADSPI_QUIRK_SWAP_ENDIAN BIT(0)
174 /* Controller needs 4x internal clock */
175 #define QUADSPI_QUIRK_4X_INT_CLK BIT(1)
178 * TKT253890, the controller needs the driver to fill the txfifo with
179 * 16 bytes at least to trigger a data transfer, even though the extra
180 * data won't be transferred.
182 #define QUADSPI_QUIRK_TKT253890 BIT(2)
184 /* TKT245618, the controller cannot wake up from wait mode */
185 #define QUADSPI_QUIRK_TKT245618 BIT(3)
188 * Controller adds QSPI_AMBA_BASE (base address of the mapped memory)
189 * internally. No need to add it when setting SFXXAD and SFAR registers
191 #define QUADSPI_QUIRK_BASE_INTERNAL BIT(4)
194 * Controller uses TDH bits in register QUADSPI_FLSHCR.
195 * They need to be set in accordance with the DDR/SDR mode.
197 #define QUADSPI_QUIRK_USE_TDH_SETTING BIT(5)
199 struct fsl_qspi_devtype_data {
203 unsigned int ahb_buf_size;
208 static const struct fsl_qspi_devtype_data vybrid_data = {
211 .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID,
212 .ahb_buf_size = SZ_1K,
213 .quirks = QUADSPI_QUIRK_SWAP_ENDIAN,
214 .little_endian = true,
217 static const struct fsl_qspi_devtype_data imx6sx_data = {
220 .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID,
221 .ahb_buf_size = SZ_1K,
222 .quirks = QUADSPI_QUIRK_4X_INT_CLK | QUADSPI_QUIRK_TKT245618,
223 .little_endian = true,
226 static const struct fsl_qspi_devtype_data imx7d_data = {
229 .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID,
230 .ahb_buf_size = SZ_1K,
231 .quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_4X_INT_CLK |
232 QUADSPI_QUIRK_USE_TDH_SETTING,
233 .little_endian = true,
236 static const struct fsl_qspi_devtype_data imx6ul_data = {
239 .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID,
240 .ahb_buf_size = SZ_1K,
241 .quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_4X_INT_CLK |
242 QUADSPI_QUIRK_USE_TDH_SETTING,
243 .little_endian = true,
246 static const struct fsl_qspi_devtype_data ls1021a_data = {
249 .invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID,
250 .ahb_buf_size = SZ_1K,
252 .little_endian = false,
255 static const struct fsl_qspi_devtype_data ls2080a_data = {
258 .ahb_buf_size = SZ_1K,
259 .invalid_mstrid = 0x0,
260 .quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_BASE_INTERNAL,
261 .little_endian = true,
265 void __iomem *iobase;
266 void __iomem *ahb_addr;
268 struct clk *clk, *clk_en;
271 const struct fsl_qspi_devtype_data *devtype_data;
273 struct pm_qos_request pm_qos_req;
277 static inline int needs_swap_endian(struct fsl_qspi *q)
279 return q->devtype_data->quirks & QUADSPI_QUIRK_SWAP_ENDIAN;
282 static inline int needs_4x_clock(struct fsl_qspi *q)
284 return q->devtype_data->quirks & QUADSPI_QUIRK_4X_INT_CLK;
287 static inline int needs_fill_txfifo(struct fsl_qspi *q)
289 return q->devtype_data->quirks & QUADSPI_QUIRK_TKT253890;
292 static inline int needs_wakeup_wait_mode(struct fsl_qspi *q)
294 return q->devtype_data->quirks & QUADSPI_QUIRK_TKT245618;
297 static inline int needs_amba_base_offset(struct fsl_qspi *q)
299 return !(q->devtype_data->quirks & QUADSPI_QUIRK_BASE_INTERNAL);
302 static inline int needs_tdh_setting(struct fsl_qspi *q)
304 return q->devtype_data->quirks & QUADSPI_QUIRK_USE_TDH_SETTING;
308 * An IC bug makes it necessary to rearrange the 32-bit data.
309 * Later chips, such as IMX6SLX, have fixed this bug.
311 static inline u32 fsl_qspi_endian_xchg(struct fsl_qspi *q, u32 a)
313 return needs_swap_endian(q) ? __swab32(a) : a;
317 * R/W functions for big- or little-endian registers:
318 * The QSPI controller's endianness is independent of
319 * the CPU core's endianness. So far, although the CPU
320 * core is little-endian the QSPI controller can use
321 * big-endian or little-endian.
323 static void qspi_writel(struct fsl_qspi *q, u32 val, void __iomem *addr)
325 if (q->devtype_data->little_endian)
326 iowrite32(val, addr);
328 iowrite32be(val, addr);
331 static u32 qspi_readl(struct fsl_qspi *q, void __iomem *addr)
333 if (q->devtype_data->little_endian)
334 return ioread32(addr);
336 return ioread32be(addr);
339 static irqreturn_t fsl_qspi_irq_handler(int irq, void *dev_id)
341 struct fsl_qspi *q = dev_id;
344 /* clear interrupt */
345 reg = qspi_readl(q, q->iobase + QUADSPI_FR);
346 qspi_writel(q, reg, q->iobase + QUADSPI_FR);
348 if (reg & QUADSPI_FR_TFF_MASK)
351 dev_dbg(q->dev, "QUADSPI_FR : 0x%.8x:0x%.8x\n", 0, reg);
355 static int fsl_qspi_check_buswidth(struct fsl_qspi *q, u8 width)
367 static bool fsl_qspi_supports_op(struct spi_mem *mem,
368 const struct spi_mem_op *op)
370 struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->controller);
373 ret = fsl_qspi_check_buswidth(q, op->cmd.buswidth);
376 ret |= fsl_qspi_check_buswidth(q, op->addr.buswidth);
378 if (op->dummy.nbytes)
379 ret |= fsl_qspi_check_buswidth(q, op->dummy.buswidth);
382 ret |= fsl_qspi_check_buswidth(q, op->data.buswidth);
388 * The number of instructions needed for the op, needs
389 * to fit into a single LUT entry.
391 if (op->addr.nbytes +
392 (op->dummy.nbytes ? 1:0) +
393 (op->data.nbytes ? 1:0) > 6)
396 /* Max 64 dummy clock cycles supported */
397 if (op->dummy.nbytes &&
398 (op->dummy.nbytes * 8 / op->dummy.buswidth > 64))
401 /* Max data length, check controller limits and alignment */
402 if (op->data.dir == SPI_MEM_DATA_IN &&
403 (op->data.nbytes > q->devtype_data->ahb_buf_size ||
404 (op->data.nbytes > q->devtype_data->rxfifo - 4 &&
405 !IS_ALIGNED(op->data.nbytes, 8))))
408 if (op->data.dir == SPI_MEM_DATA_OUT &&
409 op->data.nbytes > q->devtype_data->txfifo)
412 return spi_mem_default_supports_op(mem, op);
415 static void fsl_qspi_prepare_lut(struct fsl_qspi *q,
416 const struct spi_mem_op *op)
418 void __iomem *base = q->iobase;
422 lutval[0] |= LUT_DEF(0, LUT_CMD, LUT_PAD(op->cmd.buswidth),
426 * For some unknown reason, using LUT_ADDR doesn't work in some
427 * cases (at least with only one byte long addresses), so
428 * let's use LUT_MODE to write the address bytes one by one
430 for (i = 0; i < op->addr.nbytes; i++) {
431 u8 addrbyte = op->addr.val >> (8 * (op->addr.nbytes - i - 1));
433 lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_MODE,
434 LUT_PAD(op->addr.buswidth),
439 if (op->dummy.nbytes) {
440 lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_DUMMY,
441 LUT_PAD(op->dummy.buswidth),
442 op->dummy.nbytes * 8 /
447 if (op->data.nbytes) {
448 lutval[lutidx / 2] |= LUT_DEF(lutidx,
449 op->data.dir == SPI_MEM_DATA_IN ?
450 LUT_FSL_READ : LUT_FSL_WRITE,
451 LUT_PAD(op->data.buswidth),
456 lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_STOP, 0, 0);
459 qspi_writel(q, QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY);
460 qspi_writel(q, QUADSPI_LCKER_UNLOCK, q->iobase + QUADSPI_LCKCR);
463 for (i = 0; i < ARRAY_SIZE(lutval); i++)
464 qspi_writel(q, lutval[i], base + QUADSPI_LUT_REG(i));
467 qspi_writel(q, QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY);
468 qspi_writel(q, QUADSPI_LCKER_LOCK, q->iobase + QUADSPI_LCKCR);
471 static int fsl_qspi_clk_prep_enable(struct fsl_qspi *q)
475 ret = clk_prepare_enable(q->clk_en);
479 ret = clk_prepare_enable(q->clk);
481 clk_disable_unprepare(q->clk_en);
485 if (needs_wakeup_wait_mode(q))
486 cpu_latency_qos_add_request(&q->pm_qos_req, 0);
491 static void fsl_qspi_clk_disable_unprep(struct fsl_qspi *q)
493 if (needs_wakeup_wait_mode(q))
494 cpu_latency_qos_remove_request(&q->pm_qos_req);
496 clk_disable_unprepare(q->clk);
497 clk_disable_unprepare(q->clk_en);
501 * If we have changed the content of the flash by writing or erasing, or if we
502 * read from flash with a different offset into the page buffer, we need to
503 * invalidate the AHB buffer. If we do not do so, we may read out the wrong
504 * data. The spec tells us reset the AHB domain and Serial Flash domain at
507 static void fsl_qspi_invalidate(struct fsl_qspi *q)
511 reg = qspi_readl(q, q->iobase + QUADSPI_MCR);
512 reg |= QUADSPI_MCR_SWRSTHD_MASK | QUADSPI_MCR_SWRSTSD_MASK;
513 qspi_writel(q, reg, q->iobase + QUADSPI_MCR);
516 * The minimum delay : 1 AHB + 2 SFCK clocks.
517 * Delay 1 us is enough.
521 reg &= ~(QUADSPI_MCR_SWRSTHD_MASK | QUADSPI_MCR_SWRSTSD_MASK);
522 qspi_writel(q, reg, q->iobase + QUADSPI_MCR);
525 static void fsl_qspi_select_mem(struct fsl_qspi *q, struct spi_device *spi)
527 unsigned long rate = spi->max_speed_hz;
530 if (q->selected == spi_get_chipselect(spi, 0))
533 if (needs_4x_clock(q))
536 fsl_qspi_clk_disable_unprep(q);
538 ret = clk_set_rate(q->clk, rate);
542 ret = fsl_qspi_clk_prep_enable(q);
546 q->selected = spi_get_chipselect(spi, 0);
548 fsl_qspi_invalidate(q);
551 static void fsl_qspi_read_ahb(struct fsl_qspi *q, const struct spi_mem_op *op)
553 memcpy_fromio(op->data.buf.in,
554 q->ahb_addr + q->selected * q->devtype_data->ahb_buf_size,
558 static void fsl_qspi_fill_txfifo(struct fsl_qspi *q,
559 const struct spi_mem_op *op)
561 void __iomem *base = q->iobase;
565 for (i = 0; i < ALIGN_DOWN(op->data.nbytes, 4); i += 4) {
566 memcpy(&val, op->data.buf.out + i, 4);
567 val = fsl_qspi_endian_xchg(q, val);
568 qspi_writel(q, val, base + QUADSPI_TBDR);
571 if (i < op->data.nbytes) {
572 memcpy(&val, op->data.buf.out + i, op->data.nbytes - i);
573 val = fsl_qspi_endian_xchg(q, val);
574 qspi_writel(q, val, base + QUADSPI_TBDR);
577 if (needs_fill_txfifo(q)) {
578 for (i = op->data.nbytes; i < 16; i += 4)
579 qspi_writel(q, 0, base + QUADSPI_TBDR);
583 static void fsl_qspi_read_rxfifo(struct fsl_qspi *q,
584 const struct spi_mem_op *op)
586 void __iomem *base = q->iobase;
588 u8 *buf = op->data.buf.in;
591 for (i = 0; i < ALIGN_DOWN(op->data.nbytes, 4); i += 4) {
592 val = qspi_readl(q, base + QUADSPI_RBDR(i / 4));
593 val = fsl_qspi_endian_xchg(q, val);
594 memcpy(buf + i, &val, 4);
597 if (i < op->data.nbytes) {
598 val = qspi_readl(q, base + QUADSPI_RBDR(i / 4));
599 val = fsl_qspi_endian_xchg(q, val);
600 memcpy(buf + i, &val, op->data.nbytes - i);
604 static int fsl_qspi_do_op(struct fsl_qspi *q, const struct spi_mem_op *op)
606 void __iomem *base = q->iobase;
609 init_completion(&q->c);
612 * Always start the sequence at the same index since we update
613 * the LUT at each exec_op() call. And also specify the DATA
614 * length, since it's has not been specified in the LUT.
616 qspi_writel(q, op->data.nbytes | QUADSPI_IPCR_SEQID(SEQID_LUT),
617 base + QUADSPI_IPCR);
619 /* Wait for the interrupt. */
620 if (!wait_for_completion_timeout(&q->c, msecs_to_jiffies(1000)))
623 if (!err && op->data.nbytes && op->data.dir == SPI_MEM_DATA_IN)
624 fsl_qspi_read_rxfifo(q, op);
629 static int fsl_qspi_readl_poll_tout(struct fsl_qspi *q, void __iomem *base,
630 u32 mask, u32 delay_us, u32 timeout_us)
634 if (!q->devtype_data->little_endian)
635 mask = (u32)cpu_to_be32(mask);
637 return readl_poll_timeout(base, reg, !(reg & mask), delay_us,
641 static int fsl_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
643 struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->controller);
644 void __iomem *base = q->iobase;
647 int invalid_mstrid = q->devtype_data->invalid_mstrid;
649 mutex_lock(&q->lock);
651 /* wait for the controller being ready */
652 fsl_qspi_readl_poll_tout(q, base + QUADSPI_SR, (QUADSPI_SR_IP_ACC_MASK |
653 QUADSPI_SR_AHB_ACC_MASK), 10, 1000);
655 fsl_qspi_select_mem(q, mem->spi);
657 if (needs_amba_base_offset(q))
658 addr_offset = q->memmap_phy;
661 q->selected * q->devtype_data->ahb_buf_size + addr_offset,
662 base + QUADSPI_SFAR);
664 qspi_writel(q, qspi_readl(q, base + QUADSPI_MCR) |
665 QUADSPI_MCR_CLR_RXF_MASK | QUADSPI_MCR_CLR_TXF_MASK,
668 qspi_writel(q, QUADSPI_SPTRCLR_BFPTRC | QUADSPI_SPTRCLR_IPPTRC,
669 base + QUADSPI_SPTRCLR);
671 qspi_writel(q, invalid_mstrid, base + QUADSPI_BUF0CR);
672 qspi_writel(q, invalid_mstrid, base + QUADSPI_BUF1CR);
673 qspi_writel(q, invalid_mstrid, base + QUADSPI_BUF2CR);
675 fsl_qspi_prepare_lut(q, op);
678 * If we have large chunks of data, we read them through the AHB bus
679 * by accessing the mapped memory. In all other cases we use
680 * IP commands to access the flash.
682 if (op->data.nbytes > (q->devtype_data->rxfifo - 4) &&
683 op->data.dir == SPI_MEM_DATA_IN) {
684 fsl_qspi_read_ahb(q, op);
686 qspi_writel(q, QUADSPI_RBCT_WMRK_MASK |
687 QUADSPI_RBCT_RXBRD_USEIPS, base + QUADSPI_RBCT);
689 if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT)
690 fsl_qspi_fill_txfifo(q, op);
692 err = fsl_qspi_do_op(q, op);
695 /* Invalidate the data in the AHB buffer. */
696 fsl_qspi_invalidate(q);
698 mutex_unlock(&q->lock);
703 static int fsl_qspi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
705 struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->controller);
707 if (op->data.dir == SPI_MEM_DATA_OUT) {
708 if (op->data.nbytes > q->devtype_data->txfifo)
709 op->data.nbytes = q->devtype_data->txfifo;
711 if (op->data.nbytes > q->devtype_data->ahb_buf_size)
712 op->data.nbytes = q->devtype_data->ahb_buf_size;
713 else if (op->data.nbytes > (q->devtype_data->rxfifo - 4))
714 op->data.nbytes = ALIGN_DOWN(op->data.nbytes, 8);
720 static int fsl_qspi_default_setup(struct fsl_qspi *q)
722 void __iomem *base = q->iobase;
723 u32 reg, addr_offset = 0;
726 /* disable and unprepare clock to avoid glitch pass to controller */
727 fsl_qspi_clk_disable_unprep(q);
729 /* the default frequency, we will change it later if necessary. */
730 ret = clk_set_rate(q->clk, 66000000);
734 ret = fsl_qspi_clk_prep_enable(q);
738 /* Reset the module */
739 qspi_writel(q, QUADSPI_MCR_SWRSTSD_MASK | QUADSPI_MCR_SWRSTHD_MASK,
743 /* Disable the module */
744 qspi_writel(q, QUADSPI_MCR_MDIS_MASK | QUADSPI_MCR_RESERVED_MASK,
748 * Previous boot stages (BootROM, bootloader) might have used DDR
749 * mode and did not clear the TDH bits. As we currently use SDR mode
750 * only, clear the TDH bits if necessary.
752 if (needs_tdh_setting(q))
753 qspi_writel(q, qspi_readl(q, base + QUADSPI_FLSHCR) &
754 ~QUADSPI_FLSHCR_TDH_MASK,
755 base + QUADSPI_FLSHCR);
757 reg = qspi_readl(q, base + QUADSPI_SMPR);
758 qspi_writel(q, reg & ~(QUADSPI_SMPR_FSDLY_MASK
759 | QUADSPI_SMPR_FSPHS_MASK
760 | QUADSPI_SMPR_HSENA_MASK
761 | QUADSPI_SMPR_DDRSMP_MASK), base + QUADSPI_SMPR);
763 /* We only use the buffer3 for AHB read */
764 qspi_writel(q, 0, base + QUADSPI_BUF0IND);
765 qspi_writel(q, 0, base + QUADSPI_BUF1IND);
766 qspi_writel(q, 0, base + QUADSPI_BUF2IND);
768 qspi_writel(q, QUADSPI_BFGENCR_SEQID(SEQID_LUT),
769 q->iobase + QUADSPI_BFGENCR);
770 qspi_writel(q, QUADSPI_RBCT_WMRK_MASK, base + QUADSPI_RBCT);
771 qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
772 QUADSPI_BUF3CR_ADATSZ(q->devtype_data->ahb_buf_size / 8),
773 base + QUADSPI_BUF3CR);
775 if (needs_amba_base_offset(q))
776 addr_offset = q->memmap_phy;
779 * In HW there can be a maximum of four chips on two buses with
780 * two chip selects on each bus. We use four chip selects in SW
781 * to differentiate between the four chips.
782 * We use ahb_buf_size for each chip and set SFA1AD, SFA2AD, SFB1AD,
783 * SFB2AD accordingly.
785 qspi_writel(q, q->devtype_data->ahb_buf_size + addr_offset,
786 base + QUADSPI_SFA1AD);
787 qspi_writel(q, q->devtype_data->ahb_buf_size * 2 + addr_offset,
788 base + QUADSPI_SFA2AD);
789 qspi_writel(q, q->devtype_data->ahb_buf_size * 3 + addr_offset,
790 base + QUADSPI_SFB1AD);
791 qspi_writel(q, q->devtype_data->ahb_buf_size * 4 + addr_offset,
792 base + QUADSPI_SFB2AD);
796 /* Enable the module */
797 qspi_writel(q, QUADSPI_MCR_RESERVED_MASK | QUADSPI_MCR_END_CFG_MASK,
800 /* clear all interrupt status */
801 qspi_writel(q, 0xffffffff, q->iobase + QUADSPI_FR);
803 /* enable the interrupt */
804 qspi_writel(q, QUADSPI_RSER_TFIE, q->iobase + QUADSPI_RSER);
809 static const char *fsl_qspi_get_name(struct spi_mem *mem)
811 struct fsl_qspi *q = spi_controller_get_devdata(mem->spi->controller);
812 struct device *dev = &mem->spi->dev;
816 * In order to keep mtdparts compatible with the old MTD driver at
817 * mtd/spi-nor/fsl-quadspi.c, we set a custom name derived from the
818 * platform_device of the controller.
820 if (of_get_available_child_count(q->dev->of_node) == 1)
821 return dev_name(q->dev);
823 name = devm_kasprintf(dev, GFP_KERNEL,
824 "%s-%d", dev_name(q->dev),
825 spi_get_chipselect(mem->spi, 0));
828 dev_err(dev, "failed to get memory for custom flash name\n");
829 return ERR_PTR(-ENOMEM);
835 static const struct spi_controller_mem_ops fsl_qspi_mem_ops = {
836 .adjust_op_size = fsl_qspi_adjust_op_size,
837 .supports_op = fsl_qspi_supports_op,
838 .exec_op = fsl_qspi_exec_op,
839 .get_name = fsl_qspi_get_name,
842 static int fsl_qspi_probe(struct platform_device *pdev)
844 struct spi_controller *ctlr;
845 struct device *dev = &pdev->dev;
846 struct device_node *np = dev->of_node;
847 struct resource *res;
851 ctlr = spi_alloc_host(&pdev->dev, sizeof(*q));
855 ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD |
856 SPI_TX_DUAL | SPI_TX_QUAD;
858 q = spi_controller_get_devdata(ctlr);
860 q->devtype_data = of_device_get_match_data(dev);
861 if (!q->devtype_data) {
866 platform_set_drvdata(pdev, q);
868 /* find the resources */
869 q->iobase = devm_platform_ioremap_resource_byname(pdev, "QuadSPI");
870 if (IS_ERR(q->iobase)) {
871 ret = PTR_ERR(q->iobase);
875 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
881 q->memmap_phy = res->start;
882 /* Since there are 4 cs, map size required is 4 times ahb_buf_size */
883 q->ahb_addr = devm_ioremap(dev, q->memmap_phy,
884 (q->devtype_data->ahb_buf_size * 4));
890 /* find the clocks */
891 q->clk_en = devm_clk_get(dev, "qspi_en");
892 if (IS_ERR(q->clk_en)) {
893 ret = PTR_ERR(q->clk_en);
897 q->clk = devm_clk_get(dev, "qspi");
898 if (IS_ERR(q->clk)) {
899 ret = PTR_ERR(q->clk);
903 ret = fsl_qspi_clk_prep_enable(q);
905 dev_err(dev, "can not enable the clock\n");
910 ret = platform_get_irq(pdev, 0);
912 goto err_disable_clk;
914 ret = devm_request_irq(dev, ret,
915 fsl_qspi_irq_handler, 0, pdev->name, q);
917 dev_err(dev, "failed to request irq: %d\n", ret);
918 goto err_disable_clk;
921 mutex_init(&q->lock);
924 ctlr->num_chipselect = 4;
925 ctlr->mem_ops = &fsl_qspi_mem_ops;
927 fsl_qspi_default_setup(q);
929 ctlr->dev.of_node = np;
931 ret = devm_spi_register_controller(dev, ctlr);
933 goto err_destroy_mutex;
938 mutex_destroy(&q->lock);
941 fsl_qspi_clk_disable_unprep(q);
944 spi_controller_put(ctlr);
946 dev_err(dev, "Freescale QuadSPI probe failed\n");
950 static void fsl_qspi_remove(struct platform_device *pdev)
952 struct fsl_qspi *q = platform_get_drvdata(pdev);
954 /* disable the hardware */
955 qspi_writel(q, QUADSPI_MCR_MDIS_MASK, q->iobase + QUADSPI_MCR);
956 qspi_writel(q, 0x0, q->iobase + QUADSPI_RSER);
958 fsl_qspi_clk_disable_unprep(q);
960 mutex_destroy(&q->lock);
963 static int fsl_qspi_suspend(struct device *dev)
968 static int fsl_qspi_resume(struct device *dev)
970 struct fsl_qspi *q = dev_get_drvdata(dev);
972 fsl_qspi_default_setup(q);
977 static const struct of_device_id fsl_qspi_dt_ids[] = {
978 { .compatible = "fsl,vf610-qspi", .data = &vybrid_data, },
979 { .compatible = "fsl,imx6sx-qspi", .data = &imx6sx_data, },
980 { .compatible = "fsl,imx7d-qspi", .data = &imx7d_data, },
981 { .compatible = "fsl,imx6ul-qspi", .data = &imx6ul_data, },
982 { .compatible = "fsl,ls1021a-qspi", .data = &ls1021a_data, },
983 { .compatible = "fsl,ls2080a-qspi", .data = &ls2080a_data, },
986 MODULE_DEVICE_TABLE(of, fsl_qspi_dt_ids);
988 static const struct dev_pm_ops fsl_qspi_pm_ops = {
989 .suspend = fsl_qspi_suspend,
990 .resume = fsl_qspi_resume,
993 static struct platform_driver fsl_qspi_driver = {
995 .name = "fsl-quadspi",
996 .of_match_table = fsl_qspi_dt_ids,
997 .pm = &fsl_qspi_pm_ops,
999 .probe = fsl_qspi_probe,
1000 .remove_new = fsl_qspi_remove,
1002 module_platform_driver(fsl_qspi_driver);
1004 MODULE_DESCRIPTION("Freescale QuadSPI Controller Driver");
1005 MODULE_AUTHOR("Freescale Semiconductor Inc.");
1006 MODULE_AUTHOR("Boris Brezillon <bbrezillon@kernel.org>");
1007 MODULE_AUTHOR("Frieder Schrempf <frieder.schrempf@kontron.de>");
1008 MODULE_AUTHOR("Yogesh Gaur <yogeshnarayan.gaur@nxp.com>");
1009 MODULE_AUTHOR("Suresh Gupta <suresh.gupta@nxp.com>");
1010 MODULE_LICENSE("GPL v2");