2 * drivers/spi/amba-pl022.c
4 * A driver for the ARM PL022 PrimeCell SSP/SPI bus master.
6 * Copyright (C) 2008-2009 ST-Ericsson AB
7 * Copyright (C) 2006 STMicroelectronics Pvt. Ltd.
9 * Author: Linus Walleij <linus.walleij@stericsson.com>
11 * Initial version inspired by:
12 * linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c
13 * Initial adoption to PL022 by:
14 * Sachin Verma <sachin.verma@st.com>
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
29 * - add timeout on polled transfers
32 #include <linux/init.h>
33 #include <linux/module.h>
34 #include <linux/device.h>
35 #include <linux/ioport.h>
36 #include <linux/errno.h>
37 #include <linux/interrupt.h>
38 #include <linux/spi/spi.h>
39 #include <linux/workqueue.h>
40 #include <linux/delay.h>
41 #include <linux/clk.h>
42 #include <linux/err.h>
43 #include <linux/amba/bus.h>
44 #include <linux/amba/pl022.h>
46 #include <linux/slab.h>
47 #include <linux/dmaengine.h>
48 #include <linux/dma-mapping.h>
49 #include <linux/scatterlist.h>
52 * This macro is used to define some register default values.
53 * reg is masked with mask, the OR:ed with an (again masked)
54 * val shifted sb steps to the left.
56 #define SSP_WRITE_BITS(reg, val, mask, sb) \
57 ((reg) = (((reg) & ~(mask)) | (((val)<<(sb)) & (mask))))
60 * This macro is also used to define some default values.
61 * It will just shift val by sb steps to the left and mask
62 * the result with mask.
64 #define GEN_MASK_BITS(val, mask, sb) \
65 (((val)<<(sb)) & (mask))
68 #define DO_NOT_DRIVE_TX 1
70 #define DO_NOT_QUEUE_DMA 0
77 * Macros to access SSP Registers with their offsets
79 #define SSP_CR0(r) (r + 0x000)
80 #define SSP_CR1(r) (r + 0x004)
81 #define SSP_DR(r) (r + 0x008)
82 #define SSP_SR(r) (r + 0x00C)
83 #define SSP_CPSR(r) (r + 0x010)
84 #define SSP_IMSC(r) (r + 0x014)
85 #define SSP_RIS(r) (r + 0x018)
86 #define SSP_MIS(r) (r + 0x01C)
87 #define SSP_ICR(r) (r + 0x020)
88 #define SSP_DMACR(r) (r + 0x024)
89 #define SSP_ITCR(r) (r + 0x080)
90 #define SSP_ITIP(r) (r + 0x084)
91 #define SSP_ITOP(r) (r + 0x088)
92 #define SSP_TDR(r) (r + 0x08C)
94 #define SSP_PID0(r) (r + 0xFE0)
95 #define SSP_PID1(r) (r + 0xFE4)
96 #define SSP_PID2(r) (r + 0xFE8)
97 #define SSP_PID3(r) (r + 0xFEC)
99 #define SSP_CID0(r) (r + 0xFF0)
100 #define SSP_CID1(r) (r + 0xFF4)
101 #define SSP_CID2(r) (r + 0xFF8)
102 #define SSP_CID3(r) (r + 0xFFC)
105 * SSP Control Register 0 - SSP_CR0
107 #define SSP_CR0_MASK_DSS (0x0FUL << 0)
108 #define SSP_CR0_MASK_FRF (0x3UL << 4)
109 #define SSP_CR0_MASK_SPO (0x1UL << 6)
110 #define SSP_CR0_MASK_SPH (0x1UL << 7)
111 #define SSP_CR0_MASK_SCR (0xFFUL << 8)
114 * The ST version of this block moves som bits
115 * in SSP_CR0 and extends it to 32 bits
117 #define SSP_CR0_MASK_DSS_ST (0x1FUL << 0)
118 #define SSP_CR0_MASK_HALFDUP_ST (0x1UL << 5)
119 #define SSP_CR0_MASK_CSS_ST (0x1FUL << 16)
120 #define SSP_CR0_MASK_FRF_ST (0x3UL << 21)
124 * SSP Control Register 0 - SSP_CR1
126 #define SSP_CR1_MASK_LBM (0x1UL << 0)
127 #define SSP_CR1_MASK_SSE (0x1UL << 1)
128 #define SSP_CR1_MASK_MS (0x1UL << 2)
129 #define SSP_CR1_MASK_SOD (0x1UL << 3)
132 * The ST version of this block adds some bits
135 #define SSP_CR1_MASK_RENDN_ST (0x1UL << 4)
136 #define SSP_CR1_MASK_TENDN_ST (0x1UL << 5)
137 #define SSP_CR1_MASK_MWAIT_ST (0x1UL << 6)
138 #define SSP_CR1_MASK_RXIFLSEL_ST (0x7UL << 7)
139 #define SSP_CR1_MASK_TXIFLSEL_ST (0x7UL << 10)
140 /* This one is only in the PL023 variant */
141 #define SSP_CR1_MASK_FBCLKDEL_ST (0x7UL << 13)
144 * SSP Status Register - SSP_SR
146 #define SSP_SR_MASK_TFE (0x1UL << 0) /* Transmit FIFO empty */
147 #define SSP_SR_MASK_TNF (0x1UL << 1) /* Transmit FIFO not full */
148 #define SSP_SR_MASK_RNE (0x1UL << 2) /* Receive FIFO not empty */
149 #define SSP_SR_MASK_RFF (0x1UL << 3) /* Receive FIFO full */
150 #define SSP_SR_MASK_BSY (0x1UL << 4) /* Busy Flag */
153 * SSP Clock Prescale Register - SSP_CPSR
155 #define SSP_CPSR_MASK_CPSDVSR (0xFFUL << 0)
158 * SSP Interrupt Mask Set/Clear Register - SSP_IMSC
160 #define SSP_IMSC_MASK_RORIM (0x1UL << 0) /* Receive Overrun Interrupt mask */
161 #define SSP_IMSC_MASK_RTIM (0x1UL << 1) /* Receive timeout Interrupt mask */
162 #define SSP_IMSC_MASK_RXIM (0x1UL << 2) /* Receive FIFO Interrupt mask */
163 #define SSP_IMSC_MASK_TXIM (0x1UL << 3) /* Transmit FIFO Interrupt mask */
166 * SSP Raw Interrupt Status Register - SSP_RIS
168 /* Receive Overrun Raw Interrupt status */
169 #define SSP_RIS_MASK_RORRIS (0x1UL << 0)
170 /* Receive Timeout Raw Interrupt status */
171 #define SSP_RIS_MASK_RTRIS (0x1UL << 1)
172 /* Receive FIFO Raw Interrupt status */
173 #define SSP_RIS_MASK_RXRIS (0x1UL << 2)
174 /* Transmit FIFO Raw Interrupt status */
175 #define SSP_RIS_MASK_TXRIS (0x1UL << 3)
178 * SSP Masked Interrupt Status Register - SSP_MIS
180 /* Receive Overrun Masked Interrupt status */
181 #define SSP_MIS_MASK_RORMIS (0x1UL << 0)
182 /* Receive Timeout Masked Interrupt status */
183 #define SSP_MIS_MASK_RTMIS (0x1UL << 1)
184 /* Receive FIFO Masked Interrupt status */
185 #define SSP_MIS_MASK_RXMIS (0x1UL << 2)
186 /* Transmit FIFO Masked Interrupt status */
187 #define SSP_MIS_MASK_TXMIS (0x1UL << 3)
190 * SSP Interrupt Clear Register - SSP_ICR
192 /* Receive Overrun Raw Clear Interrupt bit */
193 #define SSP_ICR_MASK_RORIC (0x1UL << 0)
194 /* Receive Timeout Clear Interrupt bit */
195 #define SSP_ICR_MASK_RTIC (0x1UL << 1)
198 * SSP DMA Control Register - SSP_DMACR
200 /* Receive DMA Enable bit */
201 #define SSP_DMACR_MASK_RXDMAE (0x1UL << 0)
202 /* Transmit DMA Enable bit */
203 #define SSP_DMACR_MASK_TXDMAE (0x1UL << 1)
206 * SSP Integration Test control Register - SSP_ITCR
208 #define SSP_ITCR_MASK_ITEN (0x1UL << 0)
209 #define SSP_ITCR_MASK_TESTFIFO (0x1UL << 1)
212 * SSP Integration Test Input Register - SSP_ITIP
214 #define ITIP_MASK_SSPRXD (0x1UL << 0)
215 #define ITIP_MASK_SSPFSSIN (0x1UL << 1)
216 #define ITIP_MASK_SSPCLKIN (0x1UL << 2)
217 #define ITIP_MASK_RXDMAC (0x1UL << 3)
218 #define ITIP_MASK_TXDMAC (0x1UL << 4)
219 #define ITIP_MASK_SSPTXDIN (0x1UL << 5)
222 * SSP Integration Test output Register - SSP_ITOP
224 #define ITOP_MASK_SSPTXD (0x1UL << 0)
225 #define ITOP_MASK_SSPFSSOUT (0x1UL << 1)
226 #define ITOP_MASK_SSPCLKOUT (0x1UL << 2)
227 #define ITOP_MASK_SSPOEn (0x1UL << 3)
228 #define ITOP_MASK_SSPCTLOEn (0x1UL << 4)
229 #define ITOP_MASK_RORINTR (0x1UL << 5)
230 #define ITOP_MASK_RTINTR (0x1UL << 6)
231 #define ITOP_MASK_RXINTR (0x1UL << 7)
232 #define ITOP_MASK_TXINTR (0x1UL << 8)
233 #define ITOP_MASK_INTR (0x1UL << 9)
234 #define ITOP_MASK_RXDMABREQ (0x1UL << 10)
235 #define ITOP_MASK_RXDMASREQ (0x1UL << 11)
236 #define ITOP_MASK_TXDMABREQ (0x1UL << 12)
237 #define ITOP_MASK_TXDMASREQ (0x1UL << 13)
240 * SSP Test Data Register - SSP_TDR
242 #define TDR_MASK_TESTDATA (0xFFFFFFFF)
246 * we use the spi_message.state (void *) pointer to
247 * hold a single state value, that's why all this
248 * (void *) casting is done here.
250 #define STATE_START ((void *) 0)
251 #define STATE_RUNNING ((void *) 1)
252 #define STATE_DONE ((void *) 2)
253 #define STATE_ERROR ((void *) -1)
256 * SSP State - Whether Enabled or Disabled
258 #define SSP_DISABLED (0)
259 #define SSP_ENABLED (1)
262 * SSP DMA State - Whether DMA Enabled or Disabled
264 #define SSP_DMA_DISABLED (0)
265 #define SSP_DMA_ENABLED (1)
270 #define SSP_DEFAULT_CLKRATE 0x2
271 #define SSP_DEFAULT_PRESCALE 0x40
274 * SSP Clock Parameter ranges
276 #define CPSDVR_MIN 0x02
277 #define CPSDVR_MAX 0xFE
282 * SSP Interrupt related Macros
284 #define DEFAULT_SSP_REG_IMSC 0x0UL
285 #define DISABLE_ALL_INTERRUPTS DEFAULT_SSP_REG_IMSC
286 #define ENABLE_ALL_INTERRUPTS (~DEFAULT_SSP_REG_IMSC)
288 #define CLEAR_ALL_INTERRUPTS 0x3
292 * The type of reading going on on this chip
302 * The type of writing going on on this chip
312 * struct vendor_data - vendor-specific config parameters
313 * for PL022 derivates
314 * @fifodepth: depth of FIFOs (both)
315 * @max_bpw: maximum number of bits per word
316 * @unidir: supports unidirection transfers
317 * @extended_cr: 32 bit wide control register 0 with extra
318 * features and extra features in CR1 as found in the ST variants
319 * @pl023: supports a subset of the ST extensions called "PL023"
330 * struct pl022 - This is the private SSP driver data structure
331 * @adev: AMBA device model hookup
332 * @vendor: Vendor data for the IP block
333 * @phybase: The physical memory where the SSP device resides
334 * @virtbase: The virtual memory where the SSP is mapped
335 * @master: SPI framework hookup
336 * @master_info: controller-specific data from machine setup
337 * @regs: SSP controller register's virtual address
338 * @pump_messages: Work struct for scheduling work to the workqueue
339 * @lock: spinlock to syncronise access to driver data
340 * @workqueue: a workqueue on which any spi_message request is queued
341 * @busy: workqueue is busy
342 * @running: workqueue is running
343 * @pump_transfers: Tasklet used in Interrupt Transfer mode
344 * @cur_msg: Pointer to current spi_message being processed
345 * @cur_transfer: Pointer to current spi_transfer
346 * @cur_chip: pointer to current clients chip(assigned from controller_state)
347 * @tx: current position in TX buffer to be read
348 * @tx_end: end position in TX buffer to be read
349 * @rx: current position in RX buffer to be written
350 * @rx_end: end position in RX buffer to be written
351 * @readingtype: the type of read currently going on
352 * @writingtype: the type or write currently going on
355 struct amba_device *adev;
356 struct vendor_data *vendor;
357 resource_size_t phybase;
358 void __iomem *virtbase;
360 struct spi_master *master;
361 struct pl022_ssp_controller *master_info;
362 /* Driver message queue */
363 struct workqueue_struct *workqueue;
364 struct work_struct pump_messages;
365 spinlock_t queue_lock;
366 struct list_head queue;
369 /* Message transfer pump */
370 struct tasklet_struct pump_transfers;
371 struct spi_message *cur_msg;
372 struct spi_transfer *cur_transfer;
373 struct chip_data *cur_chip;
378 enum ssp_reading read;
379 enum ssp_writing write;
382 #ifdef CONFIG_DMA_ENGINE
383 struct dma_chan *dma_rx_channel;
384 struct dma_chan *dma_tx_channel;
385 struct sg_table sgt_rx;
386 struct sg_table sgt_tx;
392 * struct chip_data - To maintain runtime state of SSP for each client chip
393 * @cr0: Value of control register CR0 of SSP - on later ST variants this
394 * register is 32 bits wide rather than just 16
395 * @cr1: Value of control register CR1 of SSP
396 * @dmacr: Value of DMA control Register of SSP
397 * @cpsr: Value of Clock prescale register
398 * @n_bytes: how many bytes(power of 2) reqd for a given data width of client
399 * @enable_dma: Whether to enable DMA or not
400 * @write: function ptr to be used to write when doing xfer for this chip
401 * @read: function ptr to be used to read when doing xfer for this chip
402 * @cs_control: chip select callback provided by chip
403 * @xfer_type: polling/interrupt/DMA
405 * Runtime state of the SSP controller, maintained per chip,
406 * This would be set according to the current message that would be served
415 enum ssp_reading read;
416 enum ssp_writing write;
417 void (*cs_control) (u32 command);
422 * null_cs_control - Dummy chip select function
423 * @command: select/delect the chip
425 * If no chip select function is provided by client this is used as dummy
428 static void null_cs_control(u32 command)
430 pr_debug("pl022: dummy chip select control, CS=0x%x\n", command);
434 * giveback - current spi_message is over, schedule next message and call
435 * callback of this message. Assumes that caller already
436 * set message->status; dma and pio irqs are blocked
437 * @pl022: SSP driver private data structure
439 static void giveback(struct pl022 *pl022)
441 struct spi_transfer *last_transfer;
443 struct spi_message *msg;
444 void (*curr_cs_control) (u32 command);
447 * This local reference to the chip select function
448 * is needed because we set curr_chip to NULL
449 * as a step toward termininating the message.
451 curr_cs_control = pl022->cur_chip->cs_control;
452 spin_lock_irqsave(&pl022->queue_lock, flags);
453 msg = pl022->cur_msg;
454 pl022->cur_msg = NULL;
455 pl022->cur_transfer = NULL;
456 pl022->cur_chip = NULL;
457 queue_work(pl022->workqueue, &pl022->pump_messages);
458 spin_unlock_irqrestore(&pl022->queue_lock, flags);
460 last_transfer = list_entry(msg->transfers.prev,
464 /* Delay if requested before any change in chip select */
465 if (last_transfer->delay_usecs)
467 * FIXME: This runs in interrupt context.
468 * Is this really smart?
470 udelay(last_transfer->delay_usecs);
473 * Drop chip select UNLESS cs_change is true or we are returning
474 * a message with an error, or next message is for another chip
476 if (!last_transfer->cs_change)
477 curr_cs_control(SSP_CHIP_DESELECT);
479 struct spi_message *next_msg;
481 /* Holding of cs was hinted, but we need to make sure
482 * the next message is for the same chip. Don't waste
483 * time with the following tests unless this was hinted.
485 * We cannot postpone this until pump_messages, because
486 * after calling msg->complete (below) the driver that
487 * sent the current message could be unloaded, which
488 * could invalidate the cs_control() callback...
491 /* get a pointer to the next message, if any */
492 spin_lock_irqsave(&pl022->queue_lock, flags);
493 if (list_empty(&pl022->queue))
496 next_msg = list_entry(pl022->queue.next,
497 struct spi_message, queue);
498 spin_unlock_irqrestore(&pl022->queue_lock, flags);
500 /* see if the next and current messages point
503 if (next_msg && next_msg->spi != msg->spi)
505 if (!next_msg || msg->state == STATE_ERROR)
506 curr_cs_control(SSP_CHIP_DESELECT);
510 msg->complete(msg->context);
511 /* This message is completed, so let's turn off the clocks! */
512 clk_disable(pl022->clk);
513 amba_pclk_disable(pl022->adev);
517 * flush - flush the FIFO to reach a clean state
518 * @pl022: SSP driver private data structure
520 static int flush(struct pl022 *pl022)
522 unsigned long limit = loops_per_jiffy << 1;
524 dev_dbg(&pl022->adev->dev, "flush\n");
526 while (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE)
527 readw(SSP_DR(pl022->virtbase));
528 } while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_BSY) && limit--);
530 pl022->exp_fifo_level = 0;
536 * restore_state - Load configuration of current chip
537 * @pl022: SSP driver private data structure
539 static void restore_state(struct pl022 *pl022)
541 struct chip_data *chip = pl022->cur_chip;
543 if (pl022->vendor->extended_cr)
544 writel(chip->cr0, SSP_CR0(pl022->virtbase));
546 writew(chip->cr0, SSP_CR0(pl022->virtbase));
547 writew(chip->cr1, SSP_CR1(pl022->virtbase));
548 writew(chip->dmacr, SSP_DMACR(pl022->virtbase));
549 writew(chip->cpsr, SSP_CPSR(pl022->virtbase));
550 writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase));
551 writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase));
555 * Default SSP Register Values
557 #define DEFAULT_SSP_REG_CR0 ( \
558 GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS, 0) | \
559 GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF, 4) | \
560 GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
561 GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
562 GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \
565 /* ST versions have slightly different bit layout */
566 #define DEFAULT_SSP_REG_CR0_ST ( \
567 GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \
568 GEN_MASK_BITS(SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, SSP_CR0_MASK_HALFDUP_ST, 5) | \
569 GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
570 GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
571 GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) | \
572 GEN_MASK_BITS(SSP_BITS_8, SSP_CR0_MASK_CSS_ST, 16) | \
573 GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF_ST, 21) \
576 /* The PL023 version is slightly different again */
577 #define DEFAULT_SSP_REG_CR0_ST_PL023 ( \
578 GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \
579 GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
580 GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
581 GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \
584 #define DEFAULT_SSP_REG_CR1 ( \
585 GEN_MASK_BITS(LOOPBACK_DISABLED, SSP_CR1_MASK_LBM, 0) | \
586 GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \
587 GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \
588 GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) \
591 /* ST versions extend this register to use all 16 bits */
592 #define DEFAULT_SSP_REG_CR1_ST ( \
593 DEFAULT_SSP_REG_CR1 | \
594 GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \
595 GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \
596 GEN_MASK_BITS(SSP_MWIRE_WAIT_ZERO, SSP_CR1_MASK_MWAIT_ST, 6) |\
597 GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \
598 GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) \
602 * The PL023 variant has further differences: no loopback mode, no microwire
603 * support, and a new clock feedback delay setting.
605 #define DEFAULT_SSP_REG_CR1_ST_PL023 ( \
606 GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \
607 GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \
608 GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) | \
609 GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \
610 GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \
611 GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \
612 GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) | \
613 GEN_MASK_BITS(SSP_FEEDBACK_CLK_DELAY_NONE, SSP_CR1_MASK_FBCLKDEL_ST, 13) \
616 #define DEFAULT_SSP_REG_CPSR ( \
617 GEN_MASK_BITS(SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \
620 #define DEFAULT_SSP_REG_DMACR (\
621 GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_RXDMAE, 0) | \
622 GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_TXDMAE, 1) \
626 * load_ssp_default_config - Load default configuration for SSP
627 * @pl022: SSP driver private data structure
629 static void load_ssp_default_config(struct pl022 *pl022)
631 if (pl022->vendor->pl023) {
632 writel(DEFAULT_SSP_REG_CR0_ST_PL023, SSP_CR0(pl022->virtbase));
633 writew(DEFAULT_SSP_REG_CR1_ST_PL023, SSP_CR1(pl022->virtbase));
634 } else if (pl022->vendor->extended_cr) {
635 writel(DEFAULT_SSP_REG_CR0_ST, SSP_CR0(pl022->virtbase));
636 writew(DEFAULT_SSP_REG_CR1_ST, SSP_CR1(pl022->virtbase));
638 writew(DEFAULT_SSP_REG_CR0, SSP_CR0(pl022->virtbase));
639 writew(DEFAULT_SSP_REG_CR1, SSP_CR1(pl022->virtbase));
641 writew(DEFAULT_SSP_REG_DMACR, SSP_DMACR(pl022->virtbase));
642 writew(DEFAULT_SSP_REG_CPSR, SSP_CPSR(pl022->virtbase));
643 writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase));
644 writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase));
648 * This will write to TX and read from RX according to the parameters
651 static void readwriter(struct pl022 *pl022)
655 * The FIFO depth is different inbetween primecell variants.
656 * I believe filling in too much in the FIFO might cause
657 * errons in 8bit wide transfers on ARM variants (just 8 words
658 * FIFO, means only 8x8 = 64 bits in FIFO) at least.
660 * To prevent this issue, the TX FIFO is only filled to the
661 * unused RX FIFO fill length, regardless of what the TX
662 * FIFO status flag indicates.
664 dev_dbg(&pl022->adev->dev,
665 "%s, rx: %p, rxend: %p, tx: %p, txend: %p\n",
666 __func__, pl022->rx, pl022->rx_end, pl022->tx, pl022->tx_end);
668 /* Read as much as you can */
669 while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE)
670 && (pl022->rx < pl022->rx_end)) {
671 switch (pl022->read) {
673 readw(SSP_DR(pl022->virtbase));
676 *(u8 *) (pl022->rx) =
677 readw(SSP_DR(pl022->virtbase)) & 0xFFU;
680 *(u16 *) (pl022->rx) =
681 (u16) readw(SSP_DR(pl022->virtbase));
684 *(u32 *) (pl022->rx) =
685 readl(SSP_DR(pl022->virtbase));
688 pl022->rx += (pl022->cur_chip->n_bytes);
689 pl022->exp_fifo_level--;
692 * Write as much as possible up to the RX FIFO size
694 while ((pl022->exp_fifo_level < pl022->vendor->fifodepth)
695 && (pl022->tx < pl022->tx_end)) {
696 switch (pl022->write) {
698 writew(0x0, SSP_DR(pl022->virtbase));
701 writew(*(u8 *) (pl022->tx), SSP_DR(pl022->virtbase));
704 writew((*(u16 *) (pl022->tx)), SSP_DR(pl022->virtbase));
707 writel(*(u32 *) (pl022->tx), SSP_DR(pl022->virtbase));
710 pl022->tx += (pl022->cur_chip->n_bytes);
711 pl022->exp_fifo_level++;
713 * This inner reader takes care of things appearing in the RX
714 * FIFO as we're transmitting. This will happen a lot since the
715 * clock starts running when you put things into the TX FIFO,
716 * and then things are continously clocked into the RX FIFO.
718 while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE)
719 && (pl022->rx < pl022->rx_end)) {
720 switch (pl022->read) {
722 readw(SSP_DR(pl022->virtbase));
725 *(u8 *) (pl022->rx) =
726 readw(SSP_DR(pl022->virtbase)) & 0xFFU;
729 *(u16 *) (pl022->rx) =
730 (u16) readw(SSP_DR(pl022->virtbase));
733 *(u32 *) (pl022->rx) =
734 readl(SSP_DR(pl022->virtbase));
737 pl022->rx += (pl022->cur_chip->n_bytes);
738 pl022->exp_fifo_level--;
742 * When we exit here the TX FIFO should be full and the RX FIFO
749 * next_transfer - Move to the Next transfer in the current spi message
750 * @pl022: SSP driver private data structure
752 * This function moves though the linked list of spi transfers in the
753 * current spi message and returns with the state of current spi
754 * message i.e whether its last transfer is done(STATE_DONE) or
755 * Next transfer is ready(STATE_RUNNING)
757 static void *next_transfer(struct pl022 *pl022)
759 struct spi_message *msg = pl022->cur_msg;
760 struct spi_transfer *trans = pl022->cur_transfer;
762 /* Move to next transfer */
763 if (trans->transfer_list.next != &msg->transfers) {
764 pl022->cur_transfer =
765 list_entry(trans->transfer_list.next,
766 struct spi_transfer, transfer_list);
767 return STATE_RUNNING;
773 * This DMA functionality is only compiled in if we have
774 * access to the generic DMA devices/DMA engine.
776 #ifdef CONFIG_DMA_ENGINE
777 static void unmap_free_dma_scatter(struct pl022 *pl022)
779 /* Unmap and free the SG tables */
780 dma_unmap_sg(pl022->dma_tx_channel->device->dev, pl022->sgt_tx.sgl,
781 pl022->sgt_tx.nents, DMA_TO_DEVICE);
782 dma_unmap_sg(pl022->dma_rx_channel->device->dev, pl022->sgt_rx.sgl,
783 pl022->sgt_rx.nents, DMA_FROM_DEVICE);
784 sg_free_table(&pl022->sgt_rx);
785 sg_free_table(&pl022->sgt_tx);
788 static void dma_callback(void *data)
790 struct pl022 *pl022 = data;
791 struct spi_message *msg = pl022->cur_msg;
793 BUG_ON(!pl022->sgt_rx.sgl);
797 * Optionally dump out buffers to inspect contents, this is
798 * good if you want to convince yourself that the loopback
799 * read/write contents are the same, when adopting to a new
803 struct scatterlist *sg;
806 dma_sync_sg_for_cpu(&pl022->adev->dev,
811 for_each_sg(pl022->sgt_rx.sgl, sg, pl022->sgt_rx.nents, i) {
812 dev_dbg(&pl022->adev->dev, "SPI RX SG ENTRY: %d", i);
813 print_hex_dump(KERN_ERR, "SPI RX: ",
821 for_each_sg(pl022->sgt_tx.sgl, sg, pl022->sgt_tx.nents, i) {
822 dev_dbg(&pl022->adev->dev, "SPI TX SG ENTRY: %d", i);
823 print_hex_dump(KERN_ERR, "SPI TX: ",
834 unmap_free_dma_scatter(pl022);
836 /* Update total bytes transfered */
837 msg->actual_length += pl022->cur_transfer->len;
838 if (pl022->cur_transfer->cs_change)
840 cs_control(SSP_CHIP_DESELECT);
842 /* Move to next transfer */
843 msg->state = next_transfer(pl022);
844 tasklet_schedule(&pl022->pump_transfers);
847 static void setup_dma_scatter(struct pl022 *pl022,
850 struct sg_table *sgtab)
852 struct scatterlist *sg;
853 int bytesleft = length;
859 for_each_sg(sgtab->sgl, sg, sgtab->nents, i) {
861 * If there are less bytes left than what fits
862 * in the current page (plus page alignment offset)
863 * we just feed in this, else we stuff in as much
866 if (bytesleft < (PAGE_SIZE - offset_in_page(bufp)))
867 mapbytes = bytesleft;
869 mapbytes = PAGE_SIZE - offset_in_page(bufp);
870 sg_set_page(sg, virt_to_page(bufp),
871 mapbytes, offset_in_page(bufp));
873 bytesleft -= mapbytes;
874 dev_dbg(&pl022->adev->dev,
875 "set RX/TX target page @ %p, %d bytes, %d left\n",
876 bufp, mapbytes, bytesleft);
879 /* Map the dummy buffer on every page */
880 for_each_sg(sgtab->sgl, sg, sgtab->nents, i) {
881 if (bytesleft < PAGE_SIZE)
882 mapbytes = bytesleft;
884 mapbytes = PAGE_SIZE;
885 sg_set_page(sg, virt_to_page(pl022->dummypage),
887 bytesleft -= mapbytes;
888 dev_dbg(&pl022->adev->dev,
889 "set RX/TX to dummy page %d bytes, %d left\n",
890 mapbytes, bytesleft);
898 * configure_dma - configures the channels for the next transfer
899 * @pl022: SSP driver's private data structure
901 static int configure_dma(struct pl022 *pl022)
903 struct dma_slave_config rx_conf = {
904 .src_addr = SSP_DR(pl022->phybase),
905 .direction = DMA_FROM_DEVICE,
906 .src_maxburst = pl022->vendor->fifodepth >> 1,
908 struct dma_slave_config tx_conf = {
909 .dst_addr = SSP_DR(pl022->phybase),
910 .direction = DMA_TO_DEVICE,
911 .dst_maxburst = pl022->vendor->fifodepth >> 1,
915 int rx_sglen, tx_sglen;
916 struct dma_chan *rxchan = pl022->dma_rx_channel;
917 struct dma_chan *txchan = pl022->dma_tx_channel;
918 struct dma_async_tx_descriptor *rxdesc;
919 struct dma_async_tx_descriptor *txdesc;
921 /* Check that the channels are available */
922 if (!rxchan || !txchan)
925 switch (pl022->read) {
927 /* Use the same as for writing */
928 rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
931 rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
934 rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
937 rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
941 switch (pl022->write) {
943 /* Use the same as for reading */
944 tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
947 tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
950 tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
953 tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
957 /* SPI pecularity: we need to read and write the same width */
958 if (rx_conf.src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
959 rx_conf.src_addr_width = tx_conf.dst_addr_width;
960 if (tx_conf.dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
961 tx_conf.dst_addr_width = rx_conf.src_addr_width;
962 BUG_ON(rx_conf.src_addr_width != tx_conf.dst_addr_width);
964 dmaengine_slave_config(rxchan, &rx_conf);
965 dmaengine_slave_config(txchan, &tx_conf);
967 /* Create sglists for the transfers */
968 pages = (pl022->cur_transfer->len >> PAGE_SHIFT) + 1;
969 dev_dbg(&pl022->adev->dev, "using %d pages for transfer\n", pages);
971 ret = sg_alloc_table(&pl022->sgt_rx, pages, GFP_KERNEL);
973 goto err_alloc_rx_sg;
975 ret = sg_alloc_table(&pl022->sgt_tx, pages, GFP_KERNEL);
977 goto err_alloc_tx_sg;
979 /* Fill in the scatterlists for the RX+TX buffers */
980 setup_dma_scatter(pl022, pl022->rx,
981 pl022->cur_transfer->len, &pl022->sgt_rx);
982 setup_dma_scatter(pl022, pl022->tx,
983 pl022->cur_transfer->len, &pl022->sgt_tx);
985 /* Map DMA buffers */
986 rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
987 pl022->sgt_rx.nents, DMA_FROM_DEVICE);
991 tx_sglen = dma_map_sg(txchan->device->dev, pl022->sgt_tx.sgl,
992 pl022->sgt_tx.nents, DMA_TO_DEVICE);
996 /* Send both scatterlists */
997 rxdesc = rxchan->device->device_prep_slave_sg(rxchan,
1001 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1005 txdesc = txchan->device->device_prep_slave_sg(txchan,
1009 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1013 /* Put the callback on the RX transfer only, that should finish last */
1014 rxdesc->callback = dma_callback;
1015 rxdesc->callback_param = pl022;
1017 /* Submit and fire RX and TX with TX last so we're ready to read! */
1018 dmaengine_submit(rxdesc);
1019 dmaengine_submit(txdesc);
1020 dma_async_issue_pending(rxchan);
1021 dma_async_issue_pending(txchan);
1028 dmaengine_terminate_all(txchan);
1030 dmaengine_terminate_all(rxchan);
1031 dma_unmap_sg(txchan->device->dev, pl022->sgt_tx.sgl,
1032 pl022->sgt_tx.nents, DMA_TO_DEVICE);
1034 dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
1035 pl022->sgt_tx.nents, DMA_FROM_DEVICE);
1037 sg_free_table(&pl022->sgt_tx);
1039 sg_free_table(&pl022->sgt_rx);
1044 static int __init pl022_dma_probe(struct pl022 *pl022)
1046 dma_cap_mask_t mask;
1048 /* Try to acquire a generic DMA engine slave channel */
1050 dma_cap_set(DMA_SLAVE, mask);
1052 * We need both RX and TX channels to do DMA, else do none
1055 pl022->dma_rx_channel = dma_request_channel(mask,
1056 pl022->master_info->dma_filter,
1057 pl022->master_info->dma_rx_param);
1058 if (!pl022->dma_rx_channel) {
1059 dev_err(&pl022->adev->dev, "no RX DMA channel!\n");
1063 pl022->dma_tx_channel = dma_request_channel(mask,
1064 pl022->master_info->dma_filter,
1065 pl022->master_info->dma_tx_param);
1066 if (!pl022->dma_tx_channel) {
1067 dev_err(&pl022->adev->dev, "no TX DMA channel!\n");
1071 pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL);
1072 if (!pl022->dummypage) {
1073 dev_err(&pl022->adev->dev, "no DMA dummypage!\n");
1074 goto err_no_dummypage;
1077 dev_info(&pl022->adev->dev, "setup for DMA on RX %s, TX %s\n",
1078 dma_chan_name(pl022->dma_rx_channel),
1079 dma_chan_name(pl022->dma_tx_channel));
1084 dma_release_channel(pl022->dma_tx_channel);
1086 dma_release_channel(pl022->dma_rx_channel);
1087 pl022->dma_rx_channel = NULL;
1092 static void terminate_dma(struct pl022 *pl022)
1094 struct dma_chan *rxchan = pl022->dma_rx_channel;
1095 struct dma_chan *txchan = pl022->dma_tx_channel;
1097 dmaengine_terminate_all(rxchan);
1098 dmaengine_terminate_all(txchan);
1099 unmap_free_dma_scatter(pl022);
1102 static void pl022_dma_remove(struct pl022 *pl022)
1105 terminate_dma(pl022);
1106 if (pl022->dma_tx_channel)
1107 dma_release_channel(pl022->dma_tx_channel);
1108 if (pl022->dma_rx_channel)
1109 dma_release_channel(pl022->dma_rx_channel);
1110 kfree(pl022->dummypage);
1114 static inline int configure_dma(struct pl022 *pl022)
1119 static inline int pl022_dma_probe(struct pl022 *pl022)
1124 static inline void pl022_dma_remove(struct pl022 *pl022)
1130 * pl022_interrupt_handler - Interrupt handler for SSP controller
1132 * This function handles interrupts generated for an interrupt based transfer.
1133 * If a receive overrun (ROR) interrupt is there then we disable SSP, flag the
1134 * current message's state as STATE_ERROR and schedule the tasklet
1135 * pump_transfers which will do the postprocessing of the current message by
1136 * calling giveback(). Otherwise it reads data from RX FIFO till there is no
1137 * more data, and writes data in TX FIFO till it is not full. If we complete
1138 * the transfer we move to the next transfer and schedule the tasklet.
1140 static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id)
1142 struct pl022 *pl022 = dev_id;
1143 struct spi_message *msg = pl022->cur_msg;
1147 if (unlikely(!msg)) {
1148 dev_err(&pl022->adev->dev,
1149 "bad message state in interrupt handler");
1154 /* Read the Interrupt Status Register */
1155 irq_status = readw(SSP_MIS(pl022->virtbase));
1157 if (unlikely(!irq_status))
1161 * This handles the FIFO interrupts, the timeout
1162 * interrupts are flatly ignored, they cannot be
1165 if (unlikely(irq_status & SSP_MIS_MASK_RORMIS)) {
1167 * Overrun interrupt - bail out since our Data has been
1170 dev_err(&pl022->adev->dev, "FIFO overrun\n");
1171 if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RFF)
1172 dev_err(&pl022->adev->dev,
1173 "RXFIFO is full\n");
1174 if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_TNF)
1175 dev_err(&pl022->adev->dev,
1176 "TXFIFO is full\n");
1179 * Disable and clear interrupts, disable SSP,
1180 * mark message with bad status so it can be
1183 writew(DISABLE_ALL_INTERRUPTS,
1184 SSP_IMSC(pl022->virtbase));
1185 writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase));
1186 writew((readw(SSP_CR1(pl022->virtbase)) &
1187 (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase));
1188 msg->state = STATE_ERROR;
1190 /* Schedule message queue handler */
1191 tasklet_schedule(&pl022->pump_transfers);
1197 if ((pl022->tx == pl022->tx_end) && (flag == 0)) {
1199 /* Disable Transmit interrupt */
1200 writew(readw(SSP_IMSC(pl022->virtbase)) &
1201 (~SSP_IMSC_MASK_TXIM),
1202 SSP_IMSC(pl022->virtbase));
1206 * Since all transactions must write as much as shall be read,
1207 * we can conclude the entire transaction once RX is complete.
1208 * At this point, all TX will always be finished.
1210 if (pl022->rx >= pl022->rx_end) {
1211 writew(DISABLE_ALL_INTERRUPTS,
1212 SSP_IMSC(pl022->virtbase));
1213 writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase));
1214 if (unlikely(pl022->rx > pl022->rx_end)) {
1215 dev_warn(&pl022->adev->dev, "read %u surplus "
1216 "bytes (did you request an odd "
1217 "number of bytes on a 16bit bus?)\n",
1218 (u32) (pl022->rx - pl022->rx_end));
1220 /* Update total bytes transfered */
1221 msg->actual_length += pl022->cur_transfer->len;
1222 if (pl022->cur_transfer->cs_change)
1224 cs_control(SSP_CHIP_DESELECT);
1225 /* Move to next transfer */
1226 msg->state = next_transfer(pl022);
1227 tasklet_schedule(&pl022->pump_transfers);
1235 * This sets up the pointers to memory for the next message to
1236 * send out on the SPI bus.
1238 static int set_up_next_transfer(struct pl022 *pl022,
1239 struct spi_transfer *transfer)
1243 /* Sanity check the message for this bus width */
1244 residue = pl022->cur_transfer->len % pl022->cur_chip->n_bytes;
1245 if (unlikely(residue != 0)) {
1246 dev_err(&pl022->adev->dev,
1247 "message of %u bytes to transmit but the current "
1248 "chip bus has a data width of %u bytes!\n",
1249 pl022->cur_transfer->len,
1250 pl022->cur_chip->n_bytes);
1251 dev_err(&pl022->adev->dev, "skipping this message\n");
1254 pl022->tx = (void *)transfer->tx_buf;
1255 pl022->tx_end = pl022->tx + pl022->cur_transfer->len;
1256 pl022->rx = (void *)transfer->rx_buf;
1257 pl022->rx_end = pl022->rx + pl022->cur_transfer->len;
1259 pl022->tx ? pl022->cur_chip->write : WRITING_NULL;
1260 pl022->read = pl022->rx ? pl022->cur_chip->read : READING_NULL;
1265 * pump_transfers - Tasklet function which schedules next transfer
1266 * when running in interrupt or DMA transfer mode.
1267 * @data: SSP driver private data structure
1270 static void pump_transfers(unsigned long data)
1272 struct pl022 *pl022 = (struct pl022 *) data;
1273 struct spi_message *message = NULL;
1274 struct spi_transfer *transfer = NULL;
1275 struct spi_transfer *previous = NULL;
1277 /* Get current state information */
1278 message = pl022->cur_msg;
1279 transfer = pl022->cur_transfer;
1281 /* Handle for abort */
1282 if (message->state == STATE_ERROR) {
1283 message->status = -EIO;
1288 /* Handle end of message */
1289 if (message->state == STATE_DONE) {
1290 message->status = 0;
1295 /* Delay if requested at end of transfer before CS change */
1296 if (message->state == STATE_RUNNING) {
1297 previous = list_entry(transfer->transfer_list.prev,
1298 struct spi_transfer,
1300 if (previous->delay_usecs)
1302 * FIXME: This runs in interrupt context.
1303 * Is this really smart?
1305 udelay(previous->delay_usecs);
1307 /* Drop chip select only if cs_change is requested */
1308 if (previous->cs_change)
1309 pl022->cur_chip->cs_control(SSP_CHIP_SELECT);
1312 message->state = STATE_RUNNING;
1315 if (set_up_next_transfer(pl022, transfer)) {
1316 message->state = STATE_ERROR;
1317 message->status = -EIO;
1321 /* Flush the FIFOs and let's go! */
1324 if (pl022->cur_chip->enable_dma) {
1325 if (configure_dma(pl022)) {
1326 dev_dbg(&pl022->adev->dev,
1327 "configuration of DMA failed, fall back to interrupt mode\n");
1328 goto err_config_dma;
1334 writew(ENABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase));
1337 static void do_interrupt_dma_transfer(struct pl022 *pl022)
1339 u32 irqflags = ENABLE_ALL_INTERRUPTS;
1341 /* Enable target chip */
1342 pl022->cur_chip->cs_control(SSP_CHIP_SELECT);
1343 if (set_up_next_transfer(pl022, pl022->cur_transfer)) {
1345 pl022->cur_msg->state = STATE_ERROR;
1346 pl022->cur_msg->status = -EIO;
1350 /* If we're using DMA, set up DMA here */
1351 if (pl022->cur_chip->enable_dma) {
1352 /* Configure DMA transfer */
1353 if (configure_dma(pl022)) {
1354 dev_dbg(&pl022->adev->dev,
1355 "configuration of DMA failed, fall back to interrupt mode\n");
1356 goto err_config_dma;
1358 /* Disable interrupts in DMA mode, IRQ from DMA controller */
1359 irqflags = DISABLE_ALL_INTERRUPTS;
1362 /* Enable SSP, turn on interrupts */
1363 writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE),
1364 SSP_CR1(pl022->virtbase));
1365 writew(irqflags, SSP_IMSC(pl022->virtbase));
1368 static void do_polling_transfer(struct pl022 *pl022)
1370 struct spi_message *message = NULL;
1371 struct spi_transfer *transfer = NULL;
1372 struct spi_transfer *previous = NULL;
1373 struct chip_data *chip;
1375 chip = pl022->cur_chip;
1376 message = pl022->cur_msg;
1378 while (message->state != STATE_DONE) {
1379 /* Handle for abort */
1380 if (message->state == STATE_ERROR)
1382 transfer = pl022->cur_transfer;
1384 /* Delay if requested at end of transfer */
1385 if (message->state == STATE_RUNNING) {
1387 list_entry(transfer->transfer_list.prev,
1388 struct spi_transfer, transfer_list);
1389 if (previous->delay_usecs)
1390 udelay(previous->delay_usecs);
1391 if (previous->cs_change)
1392 pl022->cur_chip->cs_control(SSP_CHIP_SELECT);
1395 message->state = STATE_RUNNING;
1396 pl022->cur_chip->cs_control(SSP_CHIP_SELECT);
1399 /* Configuration Changing Per Transfer */
1400 if (set_up_next_transfer(pl022, transfer)) {
1402 message->state = STATE_ERROR;
1405 /* Flush FIFOs and enable SSP */
1407 writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE),
1408 SSP_CR1(pl022->virtbase));
1410 dev_dbg(&pl022->adev->dev, "polling transfer ongoing ...\n");
1411 /* FIXME: insert a timeout so we don't hang here indefinately */
1412 while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end)
1415 /* Update total byte transfered */
1416 message->actual_length += pl022->cur_transfer->len;
1417 if (pl022->cur_transfer->cs_change)
1418 pl022->cur_chip->cs_control(SSP_CHIP_DESELECT);
1419 /* Move to next transfer */
1420 message->state = next_transfer(pl022);
1423 /* Handle end of message */
1424 if (message->state == STATE_DONE)
1425 message->status = 0;
1427 message->status = -EIO;
1434 * pump_messages - Workqueue function which processes spi message queue
1435 * @data: pointer to private data of SSP driver
1437 * This function checks if there is any spi message in the queue that
1438 * needs processing and delegate control to appropriate function
1439 * do_polling_transfer()/do_interrupt_dma_transfer()
1440 * based on the kind of the transfer
1443 static void pump_messages(struct work_struct *work)
1445 struct pl022 *pl022 =
1446 container_of(work, struct pl022, pump_messages);
1447 unsigned long flags;
1449 /* Lock queue and check for queue work */
1450 spin_lock_irqsave(&pl022->queue_lock, flags);
1451 if (list_empty(&pl022->queue) || !pl022->running) {
1452 pl022->busy = false;
1453 spin_unlock_irqrestore(&pl022->queue_lock, flags);
1456 /* Make sure we are not already running a message */
1457 if (pl022->cur_msg) {
1458 spin_unlock_irqrestore(&pl022->queue_lock, flags);
1461 /* Extract head of queue */
1463 list_entry(pl022->queue.next, struct spi_message, queue);
1465 list_del_init(&pl022->cur_msg->queue);
1467 spin_unlock_irqrestore(&pl022->queue_lock, flags);
1469 /* Initial message state */
1470 pl022->cur_msg->state = STATE_START;
1471 pl022->cur_transfer = list_entry(pl022->cur_msg->transfers.next,
1472 struct spi_transfer,
1475 /* Setup the SPI using the per chip configuration */
1476 pl022->cur_chip = spi_get_ctldata(pl022->cur_msg->spi);
1478 * We enable the clocks here, then the clocks will be disabled when
1479 * giveback() is called in each method (poll/interrupt/DMA)
1481 amba_pclk_enable(pl022->adev);
1482 clk_enable(pl022->clk);
1483 restore_state(pl022);
1486 if (pl022->cur_chip->xfer_type == POLLING_TRANSFER)
1487 do_polling_transfer(pl022);
1489 do_interrupt_dma_transfer(pl022);
1493 static int __init init_queue(struct pl022 *pl022)
1495 INIT_LIST_HEAD(&pl022->queue);
1496 spin_lock_init(&pl022->queue_lock);
1498 pl022->running = false;
1499 pl022->busy = false;
1501 tasklet_init(&pl022->pump_transfers,
1502 pump_transfers, (unsigned long)pl022);
1504 INIT_WORK(&pl022->pump_messages, pump_messages);
1505 pl022->workqueue = create_singlethread_workqueue(
1506 dev_name(pl022->master->dev.parent));
1507 if (pl022->workqueue == NULL)
1514 static int start_queue(struct pl022 *pl022)
1516 unsigned long flags;
1518 spin_lock_irqsave(&pl022->queue_lock, flags);
1520 if (pl022->running || pl022->busy) {
1521 spin_unlock_irqrestore(&pl022->queue_lock, flags);
1525 pl022->running = true;
1526 pl022->cur_msg = NULL;
1527 pl022->cur_transfer = NULL;
1528 pl022->cur_chip = NULL;
1529 spin_unlock_irqrestore(&pl022->queue_lock, flags);
1531 queue_work(pl022->workqueue, &pl022->pump_messages);
1537 static int stop_queue(struct pl022 *pl022)
1539 unsigned long flags;
1540 unsigned limit = 500;
1543 spin_lock_irqsave(&pl022->queue_lock, flags);
1545 /* This is a bit lame, but is optimized for the common execution path.
1546 * A wait_queue on the pl022->busy could be used, but then the common
1547 * execution path (pump_messages) would be required to call wake_up or
1548 * friends on every SPI message. Do this instead */
1549 while (!list_empty(&pl022->queue) && pl022->busy && limit--) {
1550 spin_unlock_irqrestore(&pl022->queue_lock, flags);
1552 spin_lock_irqsave(&pl022->queue_lock, flags);
1555 if (!list_empty(&pl022->queue) || pl022->busy)
1558 pl022->running = false;
1560 spin_unlock_irqrestore(&pl022->queue_lock, flags);
1565 static int destroy_queue(struct pl022 *pl022)
1569 status = stop_queue(pl022);
1570 /* we are unloading the module or failing to load (only two calls
1571 * to this routine), and neither call can handle a return value.
1572 * However, destroy_workqueue calls flush_workqueue, and that will
1573 * block until all work is done. If the reason that stop_queue
1574 * timed out is that the work will never finish, then it does no
1575 * good to call destroy_workqueue, so return anyway. */
1579 destroy_workqueue(pl022->workqueue);
1584 static int verify_controller_parameters(struct pl022 *pl022,
1585 struct pl022_config_chip const *chip_info)
1587 if ((chip_info->iface < SSP_INTERFACE_MOTOROLA_SPI)
1588 || (chip_info->iface > SSP_INTERFACE_UNIDIRECTIONAL)) {
1589 dev_err(&pl022->adev->dev,
1590 "interface is configured incorrectly\n");
1593 if ((chip_info->iface == SSP_INTERFACE_UNIDIRECTIONAL) &&
1594 (!pl022->vendor->unidir)) {
1595 dev_err(&pl022->adev->dev,
1596 "unidirectional mode not supported in this "
1597 "hardware version\n");
1600 if ((chip_info->hierarchy != SSP_MASTER)
1601 && (chip_info->hierarchy != SSP_SLAVE)) {
1602 dev_err(&pl022->adev->dev,
1603 "hierarchy is configured incorrectly\n");
1606 if ((chip_info->com_mode != INTERRUPT_TRANSFER)
1607 && (chip_info->com_mode != DMA_TRANSFER)
1608 && (chip_info->com_mode != POLLING_TRANSFER)) {
1609 dev_err(&pl022->adev->dev,
1610 "Communication mode is configured incorrectly\n");
1613 if ((chip_info->rx_lev_trig < SSP_RX_1_OR_MORE_ELEM)
1614 || (chip_info->rx_lev_trig > SSP_RX_32_OR_MORE_ELEM)) {
1615 dev_err(&pl022->adev->dev,
1616 "RX FIFO Trigger Level is configured incorrectly\n");
1619 if ((chip_info->tx_lev_trig < SSP_TX_1_OR_MORE_EMPTY_LOC)
1620 || (chip_info->tx_lev_trig > SSP_TX_32_OR_MORE_EMPTY_LOC)) {
1621 dev_err(&pl022->adev->dev,
1622 "TX FIFO Trigger Level is configured incorrectly\n");
1625 if (chip_info->iface == SSP_INTERFACE_NATIONAL_MICROWIRE) {
1626 if ((chip_info->ctrl_len < SSP_BITS_4)
1627 || (chip_info->ctrl_len > SSP_BITS_32)) {
1628 dev_err(&pl022->adev->dev,
1629 "CTRL LEN is configured incorrectly\n");
1632 if ((chip_info->wait_state != SSP_MWIRE_WAIT_ZERO)
1633 && (chip_info->wait_state != SSP_MWIRE_WAIT_ONE)) {
1634 dev_err(&pl022->adev->dev,
1635 "Wait State is configured incorrectly\n");
1638 /* Half duplex is only available in the ST Micro version */
1639 if (pl022->vendor->extended_cr) {
1640 if ((chip_info->duplex !=
1641 SSP_MICROWIRE_CHANNEL_FULL_DUPLEX)
1642 && (chip_info->duplex !=
1643 SSP_MICROWIRE_CHANNEL_HALF_DUPLEX)) {
1644 dev_err(&pl022->adev->dev,
1645 "Microwire duplex mode is configured incorrectly\n");
1649 if (chip_info->duplex != SSP_MICROWIRE_CHANNEL_FULL_DUPLEX)
1650 dev_err(&pl022->adev->dev,
1651 "Microwire half duplex mode requested,"
1652 " but this is only available in the"
1653 " ST version of PL022\n");
1661 * pl022_transfer - transfer function registered to SPI master framework
1662 * @spi: spi device which is requesting transfer
1663 * @msg: spi message which is to handled is queued to driver queue
1665 * This function is registered to the SPI framework for this SPI master
1666 * controller. It will queue the spi_message in the queue of driver if
1667 * the queue is not stopped and return.
1669 static int pl022_transfer(struct spi_device *spi, struct spi_message *msg)
1671 struct pl022 *pl022 = spi_master_get_devdata(spi->master);
1672 unsigned long flags;
1674 spin_lock_irqsave(&pl022->queue_lock, flags);
1676 if (!pl022->running) {
1677 spin_unlock_irqrestore(&pl022->queue_lock, flags);
1680 msg->actual_length = 0;
1681 msg->status = -EINPROGRESS;
1682 msg->state = STATE_START;
1684 list_add_tail(&msg->queue, &pl022->queue);
1685 if (pl022->running && !pl022->busy)
1686 queue_work(pl022->workqueue, &pl022->pump_messages);
1688 spin_unlock_irqrestore(&pl022->queue_lock, flags);
1692 static int calculate_effective_freq(struct pl022 *pl022,
1694 struct ssp_clock_params *clk_freq)
1696 /* Lets calculate the frequency parameters */
1699 bool freq_found = false;
1704 rate = clk_get_rate(pl022->clk);
1705 /* cpsdvscr = 2 & scr 0 */
1706 max_tclk = (rate / (CPSDVR_MIN * (1 + SCR_MIN)));
1707 /* cpsdvsr = 254 & scr = 255 */
1708 min_tclk = (rate / (CPSDVR_MAX * (1 + SCR_MAX)));
1710 if ((freq <= max_tclk) && (freq >= min_tclk)) {
1711 while (cpsdvsr <= CPSDVR_MAX && !freq_found) {
1712 while (scr <= SCR_MAX && !freq_found) {
1714 (cpsdvsr * (1 + scr))) > freq)
1718 * This bool is made true when
1719 * effective frequency >=
1720 * target frequency is found
1724 (cpsdvsr * (1 + scr))) != freq) {
1725 if (scr == SCR_MIN) {
1739 dev_dbg(&pl022->adev->dev,
1740 "SSP Effective Frequency is %u\n",
1741 (rate / (cpsdvsr * (1 + scr))));
1742 clk_freq->cpsdvsr = (u8) (cpsdvsr & 0xFF);
1743 clk_freq->scr = (u8) (scr & 0xFF);
1744 dev_dbg(&pl022->adev->dev,
1745 "SSP cpsdvsr = %d, scr = %d\n",
1746 clk_freq->cpsdvsr, clk_freq->scr);
1749 dev_err(&pl022->adev->dev,
1750 "controller data is incorrect: out of range frequency");
1758 * A piece of default chip info unless the platform
1761 static const struct pl022_config_chip pl022_default_chip_info = {
1762 .com_mode = POLLING_TRANSFER,
1763 .iface = SSP_INTERFACE_MOTOROLA_SPI,
1764 .hierarchy = SSP_SLAVE,
1765 .slave_tx_disable = DO_NOT_DRIVE_TX,
1766 .rx_lev_trig = SSP_RX_1_OR_MORE_ELEM,
1767 .tx_lev_trig = SSP_TX_1_OR_MORE_EMPTY_LOC,
1768 .ctrl_len = SSP_BITS_8,
1769 .wait_state = SSP_MWIRE_WAIT_ZERO,
1770 .duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX,
1771 .cs_control = null_cs_control,
1776 * pl022_setup - setup function registered to SPI master framework
1777 * @spi: spi device which is requesting setup
1779 * This function is registered to the SPI framework for this SPI master
1780 * controller. If it is the first time when setup is called by this device,
1781 * this function will initialize the runtime state for this chip and save
1782 * the same in the device structure. Else it will update the runtime info
1783 * with the updated chip info. Nothing is really being written to the
1784 * controller hardware here, that is not done until the actual transfer
1787 static int pl022_setup(struct spi_device *spi)
1789 struct pl022_config_chip const *chip_info;
1790 struct chip_data *chip;
1791 struct ssp_clock_params clk_freq = {0, };
1793 struct pl022 *pl022 = spi_master_get_devdata(spi->master);
1794 unsigned int bits = spi->bits_per_word;
1797 if (!spi->max_speed_hz)
1800 /* Get controller_state if one is supplied */
1801 chip = spi_get_ctldata(spi);
1804 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
1807 "cannot allocate controller state\n");
1811 "allocated memory for controller's runtime state\n");
1814 /* Get controller data if one is supplied */
1815 chip_info = spi->controller_data;
1817 if (chip_info == NULL) {
1818 chip_info = &pl022_default_chip_info;
1819 /* spi_board_info.controller_data not is supplied */
1821 "using default controller_data settings\n");
1824 "using user supplied controller_data settings\n");
1827 * We can override with custom divisors, else we use the board
1830 if ((0 == chip_info->clk_freq.cpsdvsr)
1831 && (0 == chip_info->clk_freq.scr)) {
1832 status = calculate_effective_freq(pl022,
1836 goto err_config_params;
1838 memcpy(&clk_freq, &chip_info->clk_freq, sizeof(clk_freq));
1839 if ((clk_freq.cpsdvsr % 2) != 0)
1841 clk_freq.cpsdvsr - 1;
1843 if ((clk_freq.cpsdvsr < CPSDVR_MIN)
1844 || (clk_freq.cpsdvsr > CPSDVR_MAX)) {
1846 "cpsdvsr is configured incorrectly\n");
1847 goto err_config_params;
1851 status = verify_controller_parameters(pl022, chip_info);
1853 dev_err(&spi->dev, "controller data is incorrect");
1854 goto err_config_params;
1857 /* Now set controller state based on controller data */
1858 chip->xfer_type = chip_info->com_mode;
1859 if (!chip_info->cs_control) {
1860 chip->cs_control = null_cs_control;
1862 "chip select function is NULL for this chip\n");
1864 chip->cs_control = chip_info->cs_control;
1867 /* PL022 doesn't support less than 4-bits */
1869 goto err_config_params;
1870 } else if (bits <= 8) {
1871 dev_dbg(&spi->dev, "4 <= n <=8 bits per word\n");
1873 chip->read = READING_U8;
1874 chip->write = WRITING_U8;
1875 } else if (bits <= 16) {
1876 dev_dbg(&spi->dev, "9 <= n <= 16 bits per word\n");
1878 chip->read = READING_U16;
1879 chip->write = WRITING_U16;
1881 if (pl022->vendor->max_bpw >= 32) {
1882 dev_dbg(&spi->dev, "17 <= n <= 32 bits per word\n");
1884 chip->read = READING_U32;
1885 chip->write = WRITING_U32;
1888 "illegal data size for this controller!\n");
1890 "a standard pl022 can only handle "
1891 "1 <= n <= 16 bit words\n");
1893 goto err_config_params;
1897 /* Now Initialize all register settings required for this chip */
1902 if ((chip_info->com_mode == DMA_TRANSFER)
1903 && ((pl022->master_info)->enable_dma)) {
1904 chip->enable_dma = true;
1905 dev_dbg(&spi->dev, "DMA mode set in controller state\n");
1907 goto err_config_params;
1908 SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED,
1909 SSP_DMACR_MASK_RXDMAE, 0);
1910 SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED,
1911 SSP_DMACR_MASK_TXDMAE, 1);
1913 chip->enable_dma = false;
1914 dev_dbg(&spi->dev, "DMA mode NOT set in controller state\n");
1915 SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED,
1916 SSP_DMACR_MASK_RXDMAE, 0);
1917 SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED,
1918 SSP_DMACR_MASK_TXDMAE, 1);
1921 chip->cpsr = clk_freq.cpsdvsr;
1923 /* Special setup for the ST micro extended control registers */
1924 if (pl022->vendor->extended_cr) {
1927 if (pl022->vendor->pl023) {
1928 /* These bits are only in the PL023 */
1929 SSP_WRITE_BITS(chip->cr1, chip_info->clkdelay,
1930 SSP_CR1_MASK_FBCLKDEL_ST, 13);
1932 /* These bits are in the PL022 but not PL023 */
1933 SSP_WRITE_BITS(chip->cr0, chip_info->duplex,
1934 SSP_CR0_MASK_HALFDUP_ST, 5);
1935 SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len,
1936 SSP_CR0_MASK_CSS_ST, 16);
1937 SSP_WRITE_BITS(chip->cr0, chip_info->iface,
1938 SSP_CR0_MASK_FRF_ST, 21);
1939 SSP_WRITE_BITS(chip->cr1, chip_info->wait_state,
1940 SSP_CR1_MASK_MWAIT_ST, 6);
1942 SSP_WRITE_BITS(chip->cr0, bits - 1,
1943 SSP_CR0_MASK_DSS_ST, 0);
1945 if (spi->mode & SPI_LSB_FIRST) {
1952 SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_RENDN_ST, 4);
1953 SSP_WRITE_BITS(chip->cr1, etx, SSP_CR1_MASK_TENDN_ST, 5);
1954 SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig,
1955 SSP_CR1_MASK_RXIFLSEL_ST, 7);
1956 SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig,
1957 SSP_CR1_MASK_TXIFLSEL_ST, 10);
1959 SSP_WRITE_BITS(chip->cr0, bits - 1,
1960 SSP_CR0_MASK_DSS, 0);
1961 SSP_WRITE_BITS(chip->cr0, chip_info->iface,
1962 SSP_CR0_MASK_FRF, 4);
1965 /* Stuff that is common for all versions */
1966 if (spi->mode & SPI_CPOL)
1967 tmp = SSP_CLK_POL_IDLE_HIGH;
1969 tmp = SSP_CLK_POL_IDLE_LOW;
1970 SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPO, 6);
1972 if (spi->mode & SPI_CPHA)
1973 tmp = SSP_CLK_SECOND_EDGE;
1975 tmp = SSP_CLK_FIRST_EDGE;
1976 SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPH, 7);
1978 SSP_WRITE_BITS(chip->cr0, clk_freq.scr, SSP_CR0_MASK_SCR, 8);
1979 /* Loopback is available on all versions except PL023 */
1980 if (!pl022->vendor->pl023) {
1981 if (spi->mode & SPI_LOOP)
1982 tmp = LOOPBACK_ENABLED;
1984 tmp = LOOPBACK_DISABLED;
1985 SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_LBM, 0);
1987 SSP_WRITE_BITS(chip->cr1, SSP_DISABLED, SSP_CR1_MASK_SSE, 1);
1988 SSP_WRITE_BITS(chip->cr1, chip_info->hierarchy, SSP_CR1_MASK_MS, 2);
1989 SSP_WRITE_BITS(chip->cr1, chip_info->slave_tx_disable, SSP_CR1_MASK_SOD, 3);
1991 /* Save controller_state */
1992 spi_set_ctldata(spi, chip);
1995 spi_set_ctldata(spi, NULL);
2001 * pl022_cleanup - cleanup function registered to SPI master framework
2002 * @spi: spi device which is requesting cleanup
2004 * This function is registered to the SPI framework for this SPI master
2005 * controller. It will free the runtime state of chip.
2007 static void pl022_cleanup(struct spi_device *spi)
2009 struct chip_data *chip = spi_get_ctldata(spi);
2011 spi_set_ctldata(spi, NULL);
2016 static int __devinit
2017 pl022_probe(struct amba_device *adev, struct amba_id *id)
2019 struct device *dev = &adev->dev;
2020 struct pl022_ssp_controller *platform_info = adev->dev.platform_data;
2021 struct spi_master *master;
2022 struct pl022 *pl022 = NULL; /*Data for this driver */
2025 dev_info(&adev->dev,
2026 "ARM PL022 driver, device ID: 0x%08x\n", adev->periphid);
2027 if (platform_info == NULL) {
2028 dev_err(&adev->dev, "probe - no platform data supplied\n");
2033 /* Allocate master with space for data */
2034 master = spi_alloc_master(dev, sizeof(struct pl022));
2035 if (master == NULL) {
2036 dev_err(&adev->dev, "probe - cannot alloc SPI master\n");
2041 pl022 = spi_master_get_devdata(master);
2042 pl022->master = master;
2043 pl022->master_info = platform_info;
2045 pl022->vendor = id->data;
2048 * Bus Number Which has been Assigned to this SSP controller
2051 master->bus_num = platform_info->bus_id;
2052 master->num_chipselect = platform_info->num_chipselect;
2053 master->cleanup = pl022_cleanup;
2054 master->setup = pl022_setup;
2055 master->transfer = pl022_transfer;
2058 * Supports mode 0-3, loopback, and active low CS. Transfers are
2059 * always MS bit first on the original pl022.
2061 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
2062 if (pl022->vendor->extended_cr)
2063 master->mode_bits |= SPI_LSB_FIRST;
2065 dev_dbg(&adev->dev, "BUSNO: %d\n", master->bus_num);
2067 status = amba_request_regions(adev, NULL);
2069 goto err_no_ioregion;
2071 pl022->phybase = adev->res.start;
2072 pl022->virtbase = ioremap(adev->res.start, resource_size(&adev->res));
2073 if (pl022->virtbase == NULL) {
2075 goto err_no_ioremap;
2077 printk(KERN_INFO "pl022: mapped registers from 0x%08x to %p\n",
2078 adev->res.start, pl022->virtbase);
2080 pl022->clk = clk_get(&adev->dev, NULL);
2081 if (IS_ERR(pl022->clk)) {
2082 status = PTR_ERR(pl022->clk);
2083 dev_err(&adev->dev, "could not retrieve SSP/SPI bus clock\n");
2088 writew((readw(SSP_CR1(pl022->virtbase)) & (~SSP_CR1_MASK_SSE)),
2089 SSP_CR1(pl022->virtbase));
2090 load_ssp_default_config(pl022);
2092 status = request_irq(adev->irq[0], pl022_interrupt_handler, 0, "pl022",
2095 dev_err(&adev->dev, "probe - cannot get IRQ (%d)\n", status);
2099 /* Get DMA channels */
2100 if (platform_info->enable_dma) {
2101 status = pl022_dma_probe(pl022);
2106 /* Initialize and start queue */
2107 status = init_queue(pl022);
2109 dev_err(&adev->dev, "probe - problem initializing queue\n");
2110 goto err_init_queue;
2112 status = start_queue(pl022);
2114 dev_err(&adev->dev, "probe - problem starting queue\n");
2115 goto err_start_queue;
2117 /* Register with the SPI framework */
2118 amba_set_drvdata(adev, pl022);
2119 status = spi_register_master(master);
2122 "probe - problem registering spi master\n");
2123 goto err_spi_register;
2125 dev_dbg(dev, "probe succeded\n");
2126 /* Disable the silicon block pclk and clock it when needed */
2127 amba_pclk_disable(adev);
2133 destroy_queue(pl022);
2134 pl022_dma_remove(pl022);
2136 free_irq(adev->irq[0], pl022);
2138 clk_put(pl022->clk);
2140 iounmap(pl022->virtbase);
2142 amba_release_regions(adev);
2144 spi_master_put(master);
2150 static int __devexit
2151 pl022_remove(struct amba_device *adev)
2153 struct pl022 *pl022 = amba_get_drvdata(adev);
2158 /* Remove the queue */
2159 status = destroy_queue(pl022);
2162 "queue remove failed (%d)\n", status);
2165 load_ssp_default_config(pl022);
2166 pl022_dma_remove(pl022);
2167 free_irq(adev->irq[0], pl022);
2168 clk_disable(pl022->clk);
2169 clk_put(pl022->clk);
2170 iounmap(pl022->virtbase);
2171 amba_release_regions(adev);
2172 tasklet_disable(&pl022->pump_transfers);
2173 spi_unregister_master(pl022->master);
2174 spi_master_put(pl022->master);
2175 amba_set_drvdata(adev, NULL);
2176 dev_dbg(&adev->dev, "remove succeded\n");
2181 static int pl022_suspend(struct amba_device *adev, pm_message_t state)
2183 struct pl022 *pl022 = amba_get_drvdata(adev);
2186 status = stop_queue(pl022);
2188 dev_warn(&adev->dev, "suspend cannot stop queue\n");
2192 amba_pclk_enable(adev);
2193 load_ssp_default_config(pl022);
2194 amba_pclk_disable(adev);
2195 dev_dbg(&adev->dev, "suspended\n");
2199 static int pl022_resume(struct amba_device *adev)
2201 struct pl022 *pl022 = amba_get_drvdata(adev);
2204 /* Start the queue running */
2205 status = start_queue(pl022);
2207 dev_err(&adev->dev, "problem starting queue (%d)\n", status);
2209 dev_dbg(&adev->dev, "resumed\n");
2214 #define pl022_suspend NULL
2215 #define pl022_resume NULL
2216 #endif /* CONFIG_PM */
2218 static struct vendor_data vendor_arm = {
2222 .extended_cr = false,
2227 static struct vendor_data vendor_st = {
2231 .extended_cr = true,
2235 static struct vendor_data vendor_st_pl023 = {
2239 .extended_cr = true,
2243 static struct amba_id pl022_ids[] = {
2246 * ARM PL022 variant, this has a 16bit wide
2247 * and 8 locations deep TX/RX FIFO
2251 .data = &vendor_arm,
2255 * ST Micro derivative, this has 32bit wide
2256 * and 32 locations deep TX/RX FIFO
2264 * ST-Ericsson derivative "PL023" (this is not
2265 * an official ARM number), this is a PL022 SSP block
2266 * stripped to SPI mode only, it has 32bit wide
2267 * and 32 locations deep TX/RX FIFO but no extended
2272 .data = &vendor_st_pl023,
2277 static struct amba_driver pl022_driver = {
2279 .name = "ssp-pl022",
2281 .id_table = pl022_ids,
2282 .probe = pl022_probe,
2283 .remove = __devexit_p(pl022_remove),
2284 .suspend = pl022_suspend,
2285 .resume = pl022_resume,
2289 static int __init pl022_init(void)
2291 return amba_driver_register(&pl022_driver);
2294 subsys_initcall(pl022_init);
2296 static void __exit pl022_exit(void)
2298 amba_driver_unregister(&pl022_driver);
2301 module_exit(pl022_exit);
2303 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
2304 MODULE_DESCRIPTION("PL022 SSP Controller Driver");
2305 MODULE_LICENSE("GPL");