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Linux/arch/arm/common/sa1111.c

  1 /*
  2  * linux/arch/arm/common/sa1111.c
  3  *
  4  * SA1111 support
  5  *
  6  * Original code by John Dorsey
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  * This file contains all generic SA1111 support.
 13  *
 14  * All initialization functions provided here are intended to be called
 15  * from machine specific code with proper arguments when required.
 16  */
 17 #include <linux/module.h>
 18 #include <linux/init.h>
 19 #include <linux/irq.h>
 20 #include <linux/kernel.h>
 21 #include <linux/delay.h>
 22 #include <linux/errno.h>
 23 #include <linux/ioport.h>
 24 #include <linux/platform_device.h>
 25 #include <linux/slab.h>
 26 #include <linux/spinlock.h>
 27 #include <linux/dma-mapping.h>
 28 #include <linux/clk.h>
 29 #include <linux/io.h>
 30 
 31 #include <mach/hardware.h>
 32 #include <asm/mach/irq.h>
 33 #include <asm/mach-types.h>
 34 #include <asm/sizes.h>
 35 
 36 #include <asm/hardware/sa1111.h>
 37 
 38 /* SA1111 IRQs */
 39 #define IRQ_GPAIN0              (0)
 40 #define IRQ_GPAIN1              (1)
 41 #define IRQ_GPAIN2              (2)
 42 #define IRQ_GPAIN3              (3)
 43 #define IRQ_GPBIN0              (4)
 44 #define IRQ_GPBIN1              (5)
 45 #define IRQ_GPBIN2              (6)
 46 #define IRQ_GPBIN3              (7)
 47 #define IRQ_GPBIN4              (8)
 48 #define IRQ_GPBIN5              (9)
 49 #define IRQ_GPCIN0              (10)
 50 #define IRQ_GPCIN1              (11)
 51 #define IRQ_GPCIN2              (12)
 52 #define IRQ_GPCIN3              (13)
 53 #define IRQ_GPCIN4              (14)
 54 #define IRQ_GPCIN5              (15)
 55 #define IRQ_GPCIN6              (16)
 56 #define IRQ_GPCIN7              (17)
 57 #define IRQ_MSTXINT             (18)
 58 #define IRQ_MSRXINT             (19)
 59 #define IRQ_MSSTOPERRINT        (20)
 60 #define IRQ_TPTXINT             (21)
 61 #define IRQ_TPRXINT             (22)
 62 #define IRQ_TPSTOPERRINT        (23)
 63 #define SSPXMTINT               (24)
 64 #define SSPRCVINT               (25)
 65 #define SSPROR                  (26)
 66 #define AUDXMTDMADONEA          (32)
 67 #define AUDRCVDMADONEA          (33)
 68 #define AUDXMTDMADONEB          (34)
 69 #define AUDRCVDMADONEB          (35)
 70 #define AUDTFSR                 (36)
 71 #define AUDRFSR                 (37)
 72 #define AUDTUR                  (38)
 73 #define AUDROR                  (39)
 74 #define AUDDTS                  (40)
 75 #define AUDRDD                  (41)
 76 #define AUDSTO                  (42)
 77 #define IRQ_USBPWR              (43)
 78 #define IRQ_HCIM                (44)
 79 #define IRQ_HCIBUFFACC          (45)
 80 #define IRQ_HCIRMTWKP           (46)
 81 #define IRQ_NHCIMFCIR           (47)
 82 #define IRQ_USB_PORT_RESUME     (48)
 83 #define IRQ_S0_READY_NINT       (49)
 84 #define IRQ_S1_READY_NINT       (50)
 85 #define IRQ_S0_CD_VALID         (51)
 86 #define IRQ_S1_CD_VALID         (52)
 87 #define IRQ_S0_BVD1_STSCHG      (53)
 88 #define IRQ_S1_BVD1_STSCHG      (54)
 89 #define SA1111_IRQ_NR           (55)
 90 
 91 extern void sa1110_mb_enable(void);
 92 extern void sa1110_mb_disable(void);
 93 
 94 /*
 95  * We keep the following data for the overall SA1111.  Note that the
 96  * struct device and struct resource are "fake"; they should be supplied
 97  * by the bus above us.  However, in the interests of getting all SA1111
 98  * drivers converted over to the device model, we provide this as an
 99  * anchor point for all the other drivers.
100  */
101 struct sa1111 {
102         struct device   *dev;
103         struct clk      *clk;
104         unsigned long   phys;
105         int             irq;
106         int             irq_base;       /* base for cascaded on-chip IRQs */
107         spinlock_t      lock;
108         void __iomem    *base;
109         struct sa1111_platform_data *pdata;
110 #ifdef CONFIG_PM
111         void            *saved_state;
112 #endif
113 };
114 
115 /*
116  * We _really_ need to eliminate this.  Its only users
117  * are the PWM and DMA checking code.
118  */
119 static struct sa1111 *g_sa1111;
120 
121 struct sa1111_dev_info {
122         unsigned long   offset;
123         unsigned long   skpcr_mask;
124         bool            dma;
125         unsigned int    devid;
126         unsigned int    irq[6];
127 };
128 
129 static struct sa1111_dev_info sa1111_devices[] = {
130         {
131                 .offset         = SA1111_USB,
132                 .skpcr_mask     = SKPCR_UCLKEN,
133                 .dma            = true,
134                 .devid          = SA1111_DEVID_USB,
135                 .irq = {
136                         IRQ_USBPWR,
137                         IRQ_HCIM,
138                         IRQ_HCIBUFFACC,
139                         IRQ_HCIRMTWKP,
140                         IRQ_NHCIMFCIR,
141                         IRQ_USB_PORT_RESUME
142                 },
143         },
144         {
145                 .offset         = 0x0600,
146                 .skpcr_mask     = SKPCR_I2SCLKEN | SKPCR_L3CLKEN,
147                 .dma            = true,
148                 .devid          = SA1111_DEVID_SAC,
149                 .irq = {
150                         AUDXMTDMADONEA,
151                         AUDXMTDMADONEB,
152                         AUDRCVDMADONEA,
153                         AUDRCVDMADONEB
154                 },
155         },
156         {
157                 .offset         = 0x0800,
158                 .skpcr_mask     = SKPCR_SCLKEN,
159                 .devid          = SA1111_DEVID_SSP,
160         },
161         {
162                 .offset         = SA1111_KBD,
163                 .skpcr_mask     = SKPCR_PTCLKEN,
164                 .devid          = SA1111_DEVID_PS2_KBD,
165                 .irq = {
166                         IRQ_TPRXINT,
167                         IRQ_TPTXINT
168                 },
169         },
170         {
171                 .offset         = SA1111_MSE,
172                 .skpcr_mask     = SKPCR_PMCLKEN,
173                 .devid          = SA1111_DEVID_PS2_MSE,
174                 .irq = {
175                         IRQ_MSRXINT,
176                         IRQ_MSTXINT
177                 },
178         },
179         {
180                 .offset         = 0x1800,
181                 .skpcr_mask     = 0,
182                 .devid          = SA1111_DEVID_PCMCIA,
183                 .irq = {
184                         IRQ_S0_READY_NINT,
185                         IRQ_S0_CD_VALID,
186                         IRQ_S0_BVD1_STSCHG,
187                         IRQ_S1_READY_NINT,
188                         IRQ_S1_CD_VALID,
189                         IRQ_S1_BVD1_STSCHG,
190                 },
191         },
192 };
193 
194 /*
195  * SA1111 interrupt support.  Since clearing an IRQ while there are
196  * active IRQs causes the interrupt output to pulse, the upper levels
197  * will call us again if there are more interrupts to process.
198  */
199 static void sa1111_irq_handler(struct irq_desc *desc)
200 {
201         unsigned int stat0, stat1, i;
202         struct sa1111 *sachip = irq_desc_get_handler_data(desc);
203         void __iomem *mapbase = sachip->base + SA1111_INTC;
204 
205         stat0 = sa1111_readl(mapbase + SA1111_INTSTATCLR0);
206         stat1 = sa1111_readl(mapbase + SA1111_INTSTATCLR1);
207 
208         sa1111_writel(stat0, mapbase + SA1111_INTSTATCLR0);
209 
210         desc->irq_data.chip->irq_ack(&desc->irq_data);
211 
212         sa1111_writel(stat1, mapbase + SA1111_INTSTATCLR1);
213 
214         if (stat0 == 0 && stat1 == 0) {
215                 do_bad_IRQ(desc);
216                 return;
217         }
218 
219         for (i = 0; stat0; i++, stat0 >>= 1)
220                 if (stat0 & 1)
221                         generic_handle_irq(i + sachip->irq_base);
222 
223         for (i = 32; stat1; i++, stat1 >>= 1)
224                 if (stat1 & 1)
225                         generic_handle_irq(i + sachip->irq_base);
226 
227         /* For level-based interrupts */
228         desc->irq_data.chip->irq_unmask(&desc->irq_data);
229 }
230 
231 #define SA1111_IRQMASK_LO(x)    (1 << (x - sachip->irq_base))
232 #define SA1111_IRQMASK_HI(x)    (1 << (x - sachip->irq_base - 32))
233 
234 static void sa1111_ack_irq(struct irq_data *d)
235 {
236 }
237 
238 static void sa1111_mask_lowirq(struct irq_data *d)
239 {
240         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
241         void __iomem *mapbase = sachip->base + SA1111_INTC;
242         unsigned long ie0;
243 
244         ie0 = sa1111_readl(mapbase + SA1111_INTEN0);
245         ie0 &= ~SA1111_IRQMASK_LO(d->irq);
246         writel(ie0, mapbase + SA1111_INTEN0);
247 }
248 
249 static void sa1111_unmask_lowirq(struct irq_data *d)
250 {
251         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
252         void __iomem *mapbase = sachip->base + SA1111_INTC;
253         unsigned long ie0;
254 
255         ie0 = sa1111_readl(mapbase + SA1111_INTEN0);
256         ie0 |= SA1111_IRQMASK_LO(d->irq);
257         sa1111_writel(ie0, mapbase + SA1111_INTEN0);
258 }
259 
260 /*
261  * Attempt to re-trigger the interrupt.  The SA1111 contains a register
262  * (INTSET) which claims to do this.  However, in practice no amount of
263  * manipulation of INTEN and INTSET guarantees that the interrupt will
264  * be triggered.  In fact, its very difficult, if not impossible to get
265  * INTSET to re-trigger the interrupt.
266  */
267 static int sa1111_retrigger_lowirq(struct irq_data *d)
268 {
269         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
270         void __iomem *mapbase = sachip->base + SA1111_INTC;
271         unsigned int mask = SA1111_IRQMASK_LO(d->irq);
272         unsigned long ip0;
273         int i;
274 
275         ip0 = sa1111_readl(mapbase + SA1111_INTPOL0);
276         for (i = 0; i < 8; i++) {
277                 sa1111_writel(ip0 ^ mask, mapbase + SA1111_INTPOL0);
278                 sa1111_writel(ip0, mapbase + SA1111_INTPOL0);
279                 if (sa1111_readl(mapbase + SA1111_INTSTATCLR0) & mask)
280                         break;
281         }
282 
283         if (i == 8)
284                 pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n",
285                        d->irq);
286         return i == 8 ? -1 : 0;
287 }
288 
289 static int sa1111_type_lowirq(struct irq_data *d, unsigned int flags)
290 {
291         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
292         void __iomem *mapbase = sachip->base + SA1111_INTC;
293         unsigned int mask = SA1111_IRQMASK_LO(d->irq);
294         unsigned long ip0;
295 
296         if (flags == IRQ_TYPE_PROBE)
297                 return 0;
298 
299         if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0)
300                 return -EINVAL;
301 
302         ip0 = sa1111_readl(mapbase + SA1111_INTPOL0);
303         if (flags & IRQ_TYPE_EDGE_RISING)
304                 ip0 &= ~mask;
305         else
306                 ip0 |= mask;
307         sa1111_writel(ip0, mapbase + SA1111_INTPOL0);
308         sa1111_writel(ip0, mapbase + SA1111_WAKEPOL0);
309 
310         return 0;
311 }
312 
313 static int sa1111_wake_lowirq(struct irq_data *d, unsigned int on)
314 {
315         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
316         void __iomem *mapbase = sachip->base + SA1111_INTC;
317         unsigned int mask = SA1111_IRQMASK_LO(d->irq);
318         unsigned long we0;
319 
320         we0 = sa1111_readl(mapbase + SA1111_WAKEEN0);
321         if (on)
322                 we0 |= mask;
323         else
324                 we0 &= ~mask;
325         sa1111_writel(we0, mapbase + SA1111_WAKEEN0);
326 
327         return 0;
328 }
329 
330 static struct irq_chip sa1111_low_chip = {
331         .name           = "SA1111-l",
332         .irq_ack        = sa1111_ack_irq,
333         .irq_mask       = sa1111_mask_lowirq,
334         .irq_unmask     = sa1111_unmask_lowirq,
335         .irq_retrigger  = sa1111_retrigger_lowirq,
336         .irq_set_type   = sa1111_type_lowirq,
337         .irq_set_wake   = sa1111_wake_lowirq,
338 };
339 
340 static void sa1111_mask_highirq(struct irq_data *d)
341 {
342         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
343         void __iomem *mapbase = sachip->base + SA1111_INTC;
344         unsigned long ie1;
345 
346         ie1 = sa1111_readl(mapbase + SA1111_INTEN1);
347         ie1 &= ~SA1111_IRQMASK_HI(d->irq);
348         sa1111_writel(ie1, mapbase + SA1111_INTEN1);
349 }
350 
351 static void sa1111_unmask_highirq(struct irq_data *d)
352 {
353         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
354         void __iomem *mapbase = sachip->base + SA1111_INTC;
355         unsigned long ie1;
356 
357         ie1 = sa1111_readl(mapbase + SA1111_INTEN1);
358         ie1 |= SA1111_IRQMASK_HI(d->irq);
359         sa1111_writel(ie1, mapbase + SA1111_INTEN1);
360 }
361 
362 /*
363  * Attempt to re-trigger the interrupt.  The SA1111 contains a register
364  * (INTSET) which claims to do this.  However, in practice no amount of
365  * manipulation of INTEN and INTSET guarantees that the interrupt will
366  * be triggered.  In fact, its very difficult, if not impossible to get
367  * INTSET to re-trigger the interrupt.
368  */
369 static int sa1111_retrigger_highirq(struct irq_data *d)
370 {
371         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
372         void __iomem *mapbase = sachip->base + SA1111_INTC;
373         unsigned int mask = SA1111_IRQMASK_HI(d->irq);
374         unsigned long ip1;
375         int i;
376 
377         ip1 = sa1111_readl(mapbase + SA1111_INTPOL1);
378         for (i = 0; i < 8; i++) {
379                 sa1111_writel(ip1 ^ mask, mapbase + SA1111_INTPOL1);
380                 sa1111_writel(ip1, mapbase + SA1111_INTPOL1);
381                 if (sa1111_readl(mapbase + SA1111_INTSTATCLR1) & mask)
382                         break;
383         }
384 
385         if (i == 8)
386                 pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n",
387                        d->irq);
388         return i == 8 ? -1 : 0;
389 }
390 
391 static int sa1111_type_highirq(struct irq_data *d, unsigned int flags)
392 {
393         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
394         void __iomem *mapbase = sachip->base + SA1111_INTC;
395         unsigned int mask = SA1111_IRQMASK_HI(d->irq);
396         unsigned long ip1;
397 
398         if (flags == IRQ_TYPE_PROBE)
399                 return 0;
400 
401         if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0)
402                 return -EINVAL;
403 
404         ip1 = sa1111_readl(mapbase + SA1111_INTPOL1);
405         if (flags & IRQ_TYPE_EDGE_RISING)
406                 ip1 &= ~mask;
407         else
408                 ip1 |= mask;
409         sa1111_writel(ip1, mapbase + SA1111_INTPOL1);
410         sa1111_writel(ip1, mapbase + SA1111_WAKEPOL1);
411 
412         return 0;
413 }
414 
415 static int sa1111_wake_highirq(struct irq_data *d, unsigned int on)
416 {
417         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
418         void __iomem *mapbase = sachip->base + SA1111_INTC;
419         unsigned int mask = SA1111_IRQMASK_HI(d->irq);
420         unsigned long we1;
421 
422         we1 = sa1111_readl(mapbase + SA1111_WAKEEN1);
423         if (on)
424                 we1 |= mask;
425         else
426                 we1 &= ~mask;
427         sa1111_writel(we1, mapbase + SA1111_WAKEEN1);
428 
429         return 0;
430 }
431 
432 static struct irq_chip sa1111_high_chip = {
433         .name           = "SA1111-h",
434         .irq_ack        = sa1111_ack_irq,
435         .irq_mask       = sa1111_mask_highirq,
436         .irq_unmask     = sa1111_unmask_highirq,
437         .irq_retrigger  = sa1111_retrigger_highirq,
438         .irq_set_type   = sa1111_type_highirq,
439         .irq_set_wake   = sa1111_wake_highirq,
440 };
441 
442 static int sa1111_setup_irq(struct sa1111 *sachip, unsigned irq_base)
443 {
444         void __iomem *irqbase = sachip->base + SA1111_INTC;
445         unsigned i, irq;
446         int ret;
447 
448         /*
449          * We're guaranteed that this region hasn't been taken.
450          */
451         request_mem_region(sachip->phys + SA1111_INTC, 512, "irq");
452 
453         ret = irq_alloc_descs(-1, irq_base, SA1111_IRQ_NR, -1);
454         if (ret <= 0) {
455                 dev_err(sachip->dev, "unable to allocate %u irqs: %d\n",
456                         SA1111_IRQ_NR, ret);
457                 if (ret == 0)
458                         ret = -EINVAL;
459                 return ret;
460         }
461 
462         sachip->irq_base = ret;
463 
464         /* disable all IRQs */
465         sa1111_writel(0, irqbase + SA1111_INTEN0);
466         sa1111_writel(0, irqbase + SA1111_INTEN1);
467         sa1111_writel(0, irqbase + SA1111_WAKEEN0);
468         sa1111_writel(0, irqbase + SA1111_WAKEEN1);
469 
470         /*
471          * detect on rising edge.  Note: Feb 2001 Errata for SA1111
472          * specifies that S0ReadyInt and S1ReadyInt should be '1'.
473          */
474         sa1111_writel(0, irqbase + SA1111_INTPOL0);
475         sa1111_writel(SA1111_IRQMASK_HI(IRQ_S0_READY_NINT) |
476                       SA1111_IRQMASK_HI(IRQ_S1_READY_NINT),
477                       irqbase + SA1111_INTPOL1);
478 
479         /* clear all IRQs */
480         sa1111_writel(~0, irqbase + SA1111_INTSTATCLR0);
481         sa1111_writel(~0, irqbase + SA1111_INTSTATCLR1);
482 
483         for (i = IRQ_GPAIN0; i <= SSPROR; i++) {
484                 irq = sachip->irq_base + i;
485                 irq_set_chip_and_handler(irq, &sa1111_low_chip,
486                                          handle_edge_irq);
487                 irq_set_chip_data(irq, sachip);
488                 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
489         }
490 
491         for (i = AUDXMTDMADONEA; i <= IRQ_S1_BVD1_STSCHG; i++) {
492                 irq = sachip->irq_base + i;
493                 irq_set_chip_and_handler(irq, &sa1111_high_chip,
494                                          handle_edge_irq);
495                 irq_set_chip_data(irq, sachip);
496                 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
497         }
498 
499         /*
500          * Register SA1111 interrupt
501          */
502         irq_set_irq_type(sachip->irq, IRQ_TYPE_EDGE_RISING);
503         irq_set_chained_handler_and_data(sachip->irq, sa1111_irq_handler,
504                                          sachip);
505 
506         dev_info(sachip->dev, "Providing IRQ%u-%u\n",
507                 sachip->irq_base, sachip->irq_base + SA1111_IRQ_NR - 1);
508 
509         return 0;
510 }
511 
512 /*
513  * Bring the SA1111 out of reset.  This requires a set procedure:
514  *  1. nRESET asserted (by hardware)
515  *  2. CLK turned on from SA1110
516  *  3. nRESET deasserted
517  *  4. VCO turned on, PLL_BYPASS turned off
518  *  5. Wait lock time, then assert RCLKEn
519  *  7. PCR set to allow clocking of individual functions
520  *
521  * Until we've done this, the only registers we can access are:
522  *   SBI_SKCR
523  *   SBI_SMCR
524  *   SBI_SKID
525  */
526 static void sa1111_wake(struct sa1111 *sachip)
527 {
528         unsigned long flags, r;
529 
530         spin_lock_irqsave(&sachip->lock, flags);
531 
532         clk_enable(sachip->clk);
533 
534         /*
535          * Turn VCO on, and disable PLL Bypass.
536          */
537         r = sa1111_readl(sachip->base + SA1111_SKCR);
538         r &= ~SKCR_VCO_OFF;
539         sa1111_writel(r, sachip->base + SA1111_SKCR);
540         r |= SKCR_PLL_BYPASS | SKCR_OE_EN;
541         sa1111_writel(r, sachip->base + SA1111_SKCR);
542 
543         /*
544          * Wait lock time.  SA1111 manual _doesn't_
545          * specify a figure for this!  We choose 100us.
546          */
547         udelay(100);
548 
549         /*
550          * Enable RCLK.  We also ensure that RDYEN is set.
551          */
552         r |= SKCR_RCLKEN | SKCR_RDYEN;
553         sa1111_writel(r, sachip->base + SA1111_SKCR);
554 
555         /*
556          * Wait 14 RCLK cycles for the chip to finish coming out
557          * of reset. (RCLK=24MHz).  This is 590ns.
558          */
559         udelay(1);
560 
561         /*
562          * Ensure all clocks are initially off.
563          */
564         sa1111_writel(0, sachip->base + SA1111_SKPCR);
565 
566         spin_unlock_irqrestore(&sachip->lock, flags);
567 }
568 
569 #ifdef CONFIG_ARCH_SA1100
570 
571 static u32 sa1111_dma_mask[] = {
572         ~0,
573         ~(1 << 20),
574         ~(1 << 23),
575         ~(1 << 24),
576         ~(1 << 25),
577         ~(1 << 20),
578         ~(1 << 20),
579         0,
580 };
581 
582 /*
583  * Configure the SA1111 shared memory controller.
584  */
585 void
586 sa1111_configure_smc(struct sa1111 *sachip, int sdram, unsigned int drac,
587                      unsigned int cas_latency)
588 {
589         unsigned int smcr = SMCR_DTIM | SMCR_MBGE | FInsrt(drac, SMCR_DRAC);
590 
591         if (cas_latency == 3)
592                 smcr |= SMCR_CLAT;
593 
594         sa1111_writel(smcr, sachip->base + SA1111_SMCR);
595 
596         /*
597          * Now clear the bits in the DMA mask to work around the SA1111
598          * DMA erratum (Intel StrongARM SA-1111 Microprocessor Companion
599          * Chip Specification Update, June 2000, Erratum #7).
600          */
601         if (sachip->dev->dma_mask)
602                 *sachip->dev->dma_mask &= sa1111_dma_mask[drac >> 2];
603 
604         sachip->dev->coherent_dma_mask &= sa1111_dma_mask[drac >> 2];
605 }
606 #endif
607 
608 static void sa1111_dev_release(struct device *_dev)
609 {
610         struct sa1111_dev *dev = SA1111_DEV(_dev);
611 
612         kfree(dev);
613 }
614 
615 static int
616 sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent,
617                       struct sa1111_dev_info *info)
618 {
619         struct sa1111_dev *dev;
620         unsigned i;
621         int ret;
622 
623         dev = kzalloc(sizeof(struct sa1111_dev), GFP_KERNEL);
624         if (!dev) {
625                 ret = -ENOMEM;
626                 goto err_alloc;
627         }
628 
629         device_initialize(&dev->dev);
630         dev_set_name(&dev->dev, "%4.4lx", info->offset);
631         dev->devid       = info->devid;
632         dev->dev.parent  = sachip->dev;
633         dev->dev.bus     = &sa1111_bus_type;
634         dev->dev.release = sa1111_dev_release;
635         dev->res.start   = sachip->phys + info->offset;
636         dev->res.end     = dev->res.start + 511;
637         dev->res.name    = dev_name(&dev->dev);
638         dev->res.flags   = IORESOURCE_MEM;
639         dev->mapbase     = sachip->base + info->offset;
640         dev->skpcr_mask  = info->skpcr_mask;
641 
642         for (i = 0; i < ARRAY_SIZE(info->irq); i++)
643                 dev->irq[i] = sachip->irq_base + info->irq[i];
644 
645         /*
646          * If the parent device has a DMA mask associated with it, and
647          * this child supports DMA, propagate it down to the children.
648          */
649         if (info->dma && sachip->dev->dma_mask) {
650                 dev->dma_mask = *sachip->dev->dma_mask;
651                 dev->dev.dma_mask = &dev->dma_mask;
652                 dev->dev.coherent_dma_mask = sachip->dev->coherent_dma_mask;
653         }
654 
655         ret = request_resource(parent, &dev->res);
656         if (ret) {
657                 dev_err(sachip->dev, "failed to allocate resource for %s\n",
658                         dev->res.name);
659                 goto err_resource;
660         }
661 
662         ret = device_add(&dev->dev);
663         if (ret)
664                 goto err_add;
665         return 0;
666 
667  err_add:
668         release_resource(&dev->res);
669  err_resource:
670         put_device(&dev->dev);
671  err_alloc:
672         return ret;
673 }
674 
675 /**
676  *      sa1111_probe - probe for a single SA1111 chip.
677  *      @phys_addr: physical address of device.
678  *
679  *      Probe for a SA1111 chip.  This must be called
680  *      before any other SA1111-specific code.
681  *
682  *      Returns:
683  *      %-ENODEV        device not found.
684  *      %-EBUSY         physical address already marked in-use.
685  *      %-EINVAL        no platform data passed
686  *      %0              successful.
687  */
688 static int __sa1111_probe(struct device *me, struct resource *mem, int irq)
689 {
690         struct sa1111_platform_data *pd = me->platform_data;
691         struct sa1111 *sachip;
692         unsigned long id;
693         unsigned int has_devs;
694         int i, ret = -ENODEV;
695 
696         if (!pd)
697                 return -EINVAL;
698 
699         sachip = kzalloc(sizeof(struct sa1111), GFP_KERNEL);
700         if (!sachip)
701                 return -ENOMEM;
702 
703         sachip->clk = clk_get(me, "SA1111_CLK");
704         if (IS_ERR(sachip->clk)) {
705                 ret = PTR_ERR(sachip->clk);
706                 goto err_free;
707         }
708 
709         ret = clk_prepare(sachip->clk);
710         if (ret)
711                 goto err_clkput;
712 
713         spin_lock_init(&sachip->lock);
714 
715         sachip->dev = me;
716         dev_set_drvdata(sachip->dev, sachip);
717 
718         sachip->pdata = pd;
719         sachip->phys = mem->start;
720         sachip->irq = irq;
721 
722         /*
723          * Map the whole region.  This also maps the
724          * registers for our children.
725          */
726         sachip->base = ioremap(mem->start, PAGE_SIZE * 2);
727         if (!sachip->base) {
728                 ret = -ENOMEM;
729                 goto err_clk_unprep;
730         }
731 
732         /*
733          * Probe for the chip.  Only touch the SBI registers.
734          */
735         id = sa1111_readl(sachip->base + SA1111_SKID);
736         if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
737                 printk(KERN_DEBUG "SA1111 not detected: ID = %08lx\n", id);
738                 ret = -ENODEV;
739                 goto err_unmap;
740         }
741 
742         pr_info("SA1111 Microprocessor Companion Chip: silicon revision %lx, metal revision %lx\n",
743                 (id & SKID_SIREV_MASK) >> 4, id & SKID_MTREV_MASK);
744 
745         /*
746          * We found it.  Wake the chip up, and initialise.
747          */
748         sa1111_wake(sachip);
749 
750         /*
751          * The interrupt controller must be initialised before any
752          * other device to ensure that the interrupts are available.
753          */
754         if (sachip->irq != NO_IRQ) {
755                 ret = sa1111_setup_irq(sachip, pd->irq_base);
756                 if (ret)
757                         goto err_unmap;
758         }
759 
760 #ifdef CONFIG_ARCH_SA1100
761         {
762         unsigned int val;
763 
764         /*
765          * The SDRAM configuration of the SA1110 and the SA1111 must
766          * match.  This is very important to ensure that SA1111 accesses
767          * don't corrupt the SDRAM.  Note that this ungates the SA1111's
768          * MBGNT signal, so we must have called sa1110_mb_disable()
769          * beforehand.
770          */
771         sa1111_configure_smc(sachip, 1,
772                              FExtr(MDCNFG, MDCNFG_SA1110_DRAC0),
773                              FExtr(MDCNFG, MDCNFG_SA1110_TDL0));
774 
775         /*
776          * We only need to turn on DCLK whenever we want to use the
777          * DMA.  It can otherwise be held firmly in the off position.
778          * (currently, we always enable it.)
779          */
780         val = sa1111_readl(sachip->base + SA1111_SKPCR);
781         sa1111_writel(val | SKPCR_DCLKEN, sachip->base + SA1111_SKPCR);
782 
783         /*
784          * Enable the SA1110 memory bus request and grant signals.
785          */
786         sa1110_mb_enable();
787         }
788 #endif
789 
790         g_sa1111 = sachip;
791 
792         has_devs = ~0;
793         if (pd)
794                 has_devs &= ~pd->disable_devs;
795 
796         for (i = 0; i < ARRAY_SIZE(sa1111_devices); i++)
797                 if (sa1111_devices[i].devid & has_devs)
798                         sa1111_init_one_child(sachip, mem, &sa1111_devices[i]);
799 
800         return 0;
801 
802  err_unmap:
803         iounmap(sachip->base);
804  err_clk_unprep:
805         clk_unprepare(sachip->clk);
806  err_clkput:
807         clk_put(sachip->clk);
808  err_free:
809         kfree(sachip);
810         return ret;
811 }
812 
813 static int sa1111_remove_one(struct device *dev, void *data)
814 {
815         struct sa1111_dev *sadev = SA1111_DEV(dev);
816         device_del(&sadev->dev);
817         release_resource(&sadev->res);
818         put_device(&sadev->dev);
819         return 0;
820 }
821 
822 static void __sa1111_remove(struct sa1111 *sachip)
823 {
824         void __iomem *irqbase = sachip->base + SA1111_INTC;
825 
826         device_for_each_child(sachip->dev, NULL, sa1111_remove_one);
827 
828         /* disable all IRQs */
829         sa1111_writel(0, irqbase + SA1111_INTEN0);
830         sa1111_writel(0, irqbase + SA1111_INTEN1);
831         sa1111_writel(0, irqbase + SA1111_WAKEEN0);
832         sa1111_writel(0, irqbase + SA1111_WAKEEN1);
833 
834         clk_disable(sachip->clk);
835         clk_unprepare(sachip->clk);
836 
837         if (sachip->irq != NO_IRQ) {
838                 irq_set_chained_handler_and_data(sachip->irq, NULL, NULL);
839                 irq_free_descs(sachip->irq_base, SA1111_IRQ_NR);
840 
841                 release_mem_region(sachip->phys + SA1111_INTC, 512);
842         }
843 
844         iounmap(sachip->base);
845         clk_put(sachip->clk);
846         kfree(sachip);
847 }
848 
849 struct sa1111_save_data {
850         unsigned int    skcr;
851         unsigned int    skpcr;
852         unsigned int    skcdr;
853         unsigned char   skaud;
854         unsigned char   skpwm0;
855         unsigned char   skpwm1;
856 
857         /*
858          * Interrupt controller
859          */
860         unsigned int    intpol0;
861         unsigned int    intpol1;
862         unsigned int    inten0;
863         unsigned int    inten1;
864         unsigned int    wakepol0;
865         unsigned int    wakepol1;
866         unsigned int    wakeen0;
867         unsigned int    wakeen1;
868 };
869 
870 #ifdef CONFIG_PM
871 
872 static int sa1111_suspend(struct platform_device *dev, pm_message_t state)
873 {
874         struct sa1111 *sachip = platform_get_drvdata(dev);
875         struct sa1111_save_data *save;
876         unsigned long flags;
877         unsigned int val;
878         void __iomem *base;
879 
880         save = kmalloc(sizeof(struct sa1111_save_data), GFP_KERNEL);
881         if (!save)
882                 return -ENOMEM;
883         sachip->saved_state = save;
884 
885         spin_lock_irqsave(&sachip->lock, flags);
886 
887         /*
888          * Save state.
889          */
890         base = sachip->base;
891         save->skcr     = sa1111_readl(base + SA1111_SKCR);
892         save->skpcr    = sa1111_readl(base + SA1111_SKPCR);
893         save->skcdr    = sa1111_readl(base + SA1111_SKCDR);
894         save->skaud    = sa1111_readl(base + SA1111_SKAUD);
895         save->skpwm0   = sa1111_readl(base + SA1111_SKPWM0);
896         save->skpwm1   = sa1111_readl(base + SA1111_SKPWM1);
897 
898         sa1111_writel(0, sachip->base + SA1111_SKPWM0);
899         sa1111_writel(0, sachip->base + SA1111_SKPWM1);
900 
901         base = sachip->base + SA1111_INTC;
902         save->intpol0  = sa1111_readl(base + SA1111_INTPOL0);
903         save->intpol1  = sa1111_readl(base + SA1111_INTPOL1);
904         save->inten0   = sa1111_readl(base + SA1111_INTEN0);
905         save->inten1   = sa1111_readl(base + SA1111_INTEN1);
906         save->wakepol0 = sa1111_readl(base + SA1111_WAKEPOL0);
907         save->wakepol1 = sa1111_readl(base + SA1111_WAKEPOL1);
908         save->wakeen0  = sa1111_readl(base + SA1111_WAKEEN0);
909         save->wakeen1  = sa1111_readl(base + SA1111_WAKEEN1);
910 
911         /*
912          * Disable.
913          */
914         val = sa1111_readl(sachip->base + SA1111_SKCR);
915         sa1111_writel(val | SKCR_SLEEP, sachip->base + SA1111_SKCR);
916 
917         clk_disable(sachip->clk);
918 
919         spin_unlock_irqrestore(&sachip->lock, flags);
920 
921 #ifdef CONFIG_ARCH_SA1100
922         sa1110_mb_disable();
923 #endif
924 
925         return 0;
926 }
927 
928 /*
929  *      sa1111_resume - Restore the SA1111 device state.
930  *      @dev: device to restore
931  *
932  *      Restore the general state of the SA1111; clock control and
933  *      interrupt controller.  Other parts of the SA1111 must be
934  *      restored by their respective drivers, and must be called
935  *      via LDM after this function.
936  */
937 static int sa1111_resume(struct platform_device *dev)
938 {
939         struct sa1111 *sachip = platform_get_drvdata(dev);
940         struct sa1111_save_data *save;
941         unsigned long flags, id;
942         void __iomem *base;
943 
944         save = sachip->saved_state;
945         if (!save)
946                 return 0;
947 
948         /*
949          * Ensure that the SA1111 is still here.
950          * FIXME: shouldn't do this here.
951          */
952         id = sa1111_readl(sachip->base + SA1111_SKID);
953         if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
954                 __sa1111_remove(sachip);
955                 platform_set_drvdata(dev, NULL);
956                 kfree(save);
957                 return 0;
958         }
959 
960         /*
961          * First of all, wake up the chip.
962          */
963         sa1111_wake(sachip);
964 
965 #ifdef CONFIG_ARCH_SA1100
966         /* Enable the memory bus request/grant signals */
967         sa1110_mb_enable();
968 #endif
969 
970         /*
971          * Only lock for write ops. Also, sa1111_wake must be called with
972          * released spinlock!
973          */
974         spin_lock_irqsave(&sachip->lock, flags);
975 
976         sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN0);
977         sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN1);
978 
979         base = sachip->base;
980         sa1111_writel(save->skcr,     base + SA1111_SKCR);
981         sa1111_writel(save->skpcr,    base + SA1111_SKPCR);
982         sa1111_writel(save->skcdr,    base + SA1111_SKCDR);
983         sa1111_writel(save->skaud,    base + SA1111_SKAUD);
984         sa1111_writel(save->skpwm0,   base + SA1111_SKPWM0);
985         sa1111_writel(save->skpwm1,   base + SA1111_SKPWM1);
986 
987         base = sachip->base + SA1111_INTC;
988         sa1111_writel(save->intpol0,  base + SA1111_INTPOL0);
989         sa1111_writel(save->intpol1,  base + SA1111_INTPOL1);
990         sa1111_writel(save->inten0,   base + SA1111_INTEN0);
991         sa1111_writel(save->inten1,   base + SA1111_INTEN1);
992         sa1111_writel(save->wakepol0, base + SA1111_WAKEPOL0);
993         sa1111_writel(save->wakepol1, base + SA1111_WAKEPOL1);
994         sa1111_writel(save->wakeen0,  base + SA1111_WAKEEN0);
995         sa1111_writel(save->wakeen1,  base + SA1111_WAKEEN1);
996 
997         spin_unlock_irqrestore(&sachip->lock, flags);
998 
999         sachip->saved_state = NULL;
1000         kfree(save);
1001 
1002         return 0;
1003 }
1004 
1005 #else
1006 #define sa1111_suspend NULL
1007 #define sa1111_resume  NULL
1008 #endif
1009 
1010 static int sa1111_probe(struct platform_device *pdev)
1011 {
1012         struct resource *mem;
1013         int irq;
1014 
1015         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1016         if (!mem)
1017                 return -EINVAL;
1018         irq = platform_get_irq(pdev, 0);
1019         if (irq < 0)
1020                 return -ENXIO;
1021 
1022         return __sa1111_probe(&pdev->dev, mem, irq);
1023 }
1024 
1025 static int sa1111_remove(struct platform_device *pdev)
1026 {
1027         struct sa1111 *sachip = platform_get_drvdata(pdev);
1028 
1029         if (sachip) {
1030 #ifdef CONFIG_PM
1031                 kfree(sachip->saved_state);
1032                 sachip->saved_state = NULL;
1033 #endif
1034                 __sa1111_remove(sachip);
1035                 platform_set_drvdata(pdev, NULL);
1036         }
1037 
1038         return 0;
1039 }
1040 
1041 /*
1042  *      Not sure if this should be on the system bus or not yet.
1043  *      We really want some way to register a system device at
1044  *      the per-machine level, and then have this driver pick
1045  *      up the registered devices.
1046  *
1047  *      We also need to handle the SDRAM configuration for
1048  *      PXA250/SA1110 machine classes.
1049  */
1050 static struct platform_driver sa1111_device_driver = {
1051         .probe          = sa1111_probe,
1052         .remove         = sa1111_remove,
1053         .suspend        = sa1111_suspend,
1054         .resume         = sa1111_resume,
1055         .driver         = {
1056                 .name   = "sa1111",
1057         },
1058 };
1059 
1060 /*
1061  *      Get the parent device driver (us) structure
1062  *      from a child function device
1063  */
1064 static inline struct sa1111 *sa1111_chip_driver(struct sa1111_dev *sadev)
1065 {
1066         return (struct sa1111 *)dev_get_drvdata(sadev->dev.parent);
1067 }
1068 
1069 /*
1070  * The bits in the opdiv field are non-linear.
1071  */
1072 static unsigned char opdiv_table[] = { 1, 4, 2, 8 };
1073 
1074 static unsigned int __sa1111_pll_clock(struct sa1111 *sachip)
1075 {
1076         unsigned int skcdr, fbdiv, ipdiv, opdiv;
1077 
1078         skcdr = sa1111_readl(sachip->base + SA1111_SKCDR);
1079 
1080         fbdiv = (skcdr & 0x007f) + 2;
1081         ipdiv = ((skcdr & 0x0f80) >> 7) + 2;
1082         opdiv = opdiv_table[(skcdr & 0x3000) >> 12];
1083 
1084         return 3686400 * fbdiv / (ipdiv * opdiv);
1085 }
1086 
1087 /**
1088  *      sa1111_pll_clock - return the current PLL clock frequency.
1089  *      @sadev: SA1111 function block
1090  *
1091  *      BUG: we should look at SKCR.  We also blindly believe that
1092  *      the chip is being fed with the 3.6864MHz clock.
1093  *
1094  *      Returns the PLL clock in Hz.
1095  */
1096 unsigned int sa1111_pll_clock(struct sa1111_dev *sadev)
1097 {
1098         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1099 
1100         return __sa1111_pll_clock(sachip);
1101 }
1102 EXPORT_SYMBOL(sa1111_pll_clock);
1103 
1104 /**
1105  *      sa1111_select_audio_mode - select I2S or AC link mode
1106  *      @sadev: SA1111 function block
1107  *      @mode: One of %SA1111_AUDIO_ACLINK or %SA1111_AUDIO_I2S
1108  *
1109  *      Frob the SKCR to select AC Link mode or I2S mode for
1110  *      the audio block.
1111  */
1112 void sa1111_select_audio_mode(struct sa1111_dev *sadev, int mode)
1113 {
1114         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1115         unsigned long flags;
1116         unsigned int val;
1117 
1118         spin_lock_irqsave(&sachip->lock, flags);
1119 
1120         val = sa1111_readl(sachip->base + SA1111_SKCR);
1121         if (mode == SA1111_AUDIO_I2S) {
1122                 val &= ~SKCR_SELAC;
1123         } else {
1124                 val |= SKCR_SELAC;
1125         }
1126         sa1111_writel(val, sachip->base + SA1111_SKCR);
1127 
1128         spin_unlock_irqrestore(&sachip->lock, flags);
1129 }
1130 EXPORT_SYMBOL(sa1111_select_audio_mode);
1131 
1132 /**
1133  *      sa1111_set_audio_rate - set the audio sample rate
1134  *      @sadev: SA1111 SAC function block
1135  *      @rate: sample rate to select
1136  */
1137 int sa1111_set_audio_rate(struct sa1111_dev *sadev, int rate)
1138 {
1139         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1140         unsigned int div;
1141 
1142         if (sadev->devid != SA1111_DEVID_SAC)
1143                 return -EINVAL;
1144 
1145         div = (__sa1111_pll_clock(sachip) / 256 + rate / 2) / rate;
1146         if (div == 0)
1147                 div = 1;
1148         if (div > 128)
1149                 div = 128;
1150 
1151         sa1111_writel(div - 1, sachip->base + SA1111_SKAUD);
1152 
1153         return 0;
1154 }
1155 EXPORT_SYMBOL(sa1111_set_audio_rate);
1156 
1157 /**
1158  *      sa1111_get_audio_rate - get the audio sample rate
1159  *      @sadev: SA1111 SAC function block device
1160  */
1161 int sa1111_get_audio_rate(struct sa1111_dev *sadev)
1162 {
1163         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1164         unsigned long div;
1165 
1166         if (sadev->devid != SA1111_DEVID_SAC)
1167                 return -EINVAL;
1168 
1169         div = sa1111_readl(sachip->base + SA1111_SKAUD) + 1;
1170 
1171         return __sa1111_pll_clock(sachip) / (256 * div);
1172 }
1173 EXPORT_SYMBOL(sa1111_get_audio_rate);
1174 
1175 void sa1111_set_io_dir(struct sa1111_dev *sadev,
1176                        unsigned int bits, unsigned int dir,
1177                        unsigned int sleep_dir)
1178 {
1179         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1180         unsigned long flags;
1181         unsigned int val;
1182         void __iomem *gpio = sachip->base + SA1111_GPIO;
1183 
1184 #define MODIFY_BITS(port, mask, dir)            \
1185         if (mask) {                             \
1186                 val = sa1111_readl(port);       \
1187                 val &= ~(mask);                 \
1188                 val |= (dir) & (mask);          \
1189                 sa1111_writel(val, port);       \
1190         }
1191 
1192         spin_lock_irqsave(&sachip->lock, flags);
1193         MODIFY_BITS(gpio + SA1111_GPIO_PADDR, bits & 15, dir);
1194         MODIFY_BITS(gpio + SA1111_GPIO_PBDDR, (bits >> 8) & 255, dir >> 8);
1195         MODIFY_BITS(gpio + SA1111_GPIO_PCDDR, (bits >> 16) & 255, dir >> 16);
1196 
1197         MODIFY_BITS(gpio + SA1111_GPIO_PASDR, bits & 15, sleep_dir);
1198         MODIFY_BITS(gpio + SA1111_GPIO_PBSDR, (bits >> 8) & 255, sleep_dir >> 8);
1199         MODIFY_BITS(gpio + SA1111_GPIO_PCSDR, (bits >> 16) & 255, sleep_dir >> 16);
1200         spin_unlock_irqrestore(&sachip->lock, flags);
1201 }
1202 EXPORT_SYMBOL(sa1111_set_io_dir);
1203 
1204 void sa1111_set_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
1205 {
1206         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1207         unsigned long flags;
1208         unsigned int val;
1209         void __iomem *gpio = sachip->base + SA1111_GPIO;
1210 
1211         spin_lock_irqsave(&sachip->lock, flags);
1212         MODIFY_BITS(gpio + SA1111_GPIO_PADWR, bits & 15, v);
1213         MODIFY_BITS(gpio + SA1111_GPIO_PBDWR, (bits >> 8) & 255, v >> 8);
1214         MODIFY_BITS(gpio + SA1111_GPIO_PCDWR, (bits >> 16) & 255, v >> 16);
1215         spin_unlock_irqrestore(&sachip->lock, flags);
1216 }
1217 EXPORT_SYMBOL(sa1111_set_io);
1218 
1219 void sa1111_set_sleep_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
1220 {
1221         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1222         unsigned long flags;
1223         unsigned int val;
1224         void __iomem *gpio = sachip->base + SA1111_GPIO;
1225 
1226         spin_lock_irqsave(&sachip->lock, flags);
1227         MODIFY_BITS(gpio + SA1111_GPIO_PASSR, bits & 15, v);
1228         MODIFY_BITS(gpio + SA1111_GPIO_PBSSR, (bits >> 8) & 255, v >> 8);
1229         MODIFY_BITS(gpio + SA1111_GPIO_PCSSR, (bits >> 16) & 255, v >> 16);
1230         spin_unlock_irqrestore(&sachip->lock, flags);
1231 }
1232 EXPORT_SYMBOL(sa1111_set_sleep_io);
1233 
1234 /*
1235  * Individual device operations.
1236  */
1237 
1238 /**
1239  *      sa1111_enable_device - enable an on-chip SA1111 function block
1240  *      @sadev: SA1111 function block device to enable
1241  */
1242 int sa1111_enable_device(struct sa1111_dev *sadev)
1243 {
1244         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1245         unsigned long flags;
1246         unsigned int val;
1247         int ret = 0;
1248 
1249         if (sachip->pdata && sachip->pdata->enable)
1250                 ret = sachip->pdata->enable(sachip->pdata->data, sadev->devid);
1251 
1252         if (ret == 0) {
1253                 spin_lock_irqsave(&sachip->lock, flags);
1254                 val = sa1111_readl(sachip->base + SA1111_SKPCR);
1255                 sa1111_writel(val | sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
1256                 spin_unlock_irqrestore(&sachip->lock, flags);
1257         }
1258         return ret;
1259 }
1260 EXPORT_SYMBOL(sa1111_enable_device);
1261 
1262 /**
1263  *      sa1111_disable_device - disable an on-chip SA1111 function block
1264  *      @sadev: SA1111 function block device to disable
1265  */
1266 void sa1111_disable_device(struct sa1111_dev *sadev)
1267 {
1268         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1269         unsigned long flags;
1270         unsigned int val;
1271 
1272         spin_lock_irqsave(&sachip->lock, flags);
1273         val = sa1111_readl(sachip->base + SA1111_SKPCR);
1274         sa1111_writel(val & ~sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
1275         spin_unlock_irqrestore(&sachip->lock, flags);
1276 
1277         if (sachip->pdata && sachip->pdata->disable)
1278                 sachip->pdata->disable(sachip->pdata->data, sadev->devid);
1279 }
1280 EXPORT_SYMBOL(sa1111_disable_device);
1281 
1282 /*
1283  *      SA1111 "Register Access Bus."
1284  *
1285  *      We model this as a regular bus type, and hang devices directly
1286  *      off this.
1287  */
1288 static int sa1111_match(struct device *_dev, struct device_driver *_drv)
1289 {
1290         struct sa1111_dev *dev = SA1111_DEV(_dev);
1291         struct sa1111_driver *drv = SA1111_DRV(_drv);
1292 
1293         return !!(dev->devid & drv->devid);
1294 }
1295 
1296 static int sa1111_bus_suspend(struct device *dev, pm_message_t state)
1297 {
1298         struct sa1111_dev *sadev = SA1111_DEV(dev);
1299         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1300         int ret = 0;
1301 
1302         if (drv && drv->suspend)
1303                 ret = drv->suspend(sadev, state);
1304         return ret;
1305 }
1306 
1307 static int sa1111_bus_resume(struct device *dev)
1308 {
1309         struct sa1111_dev *sadev = SA1111_DEV(dev);
1310         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1311         int ret = 0;
1312 
1313         if (drv && drv->resume)
1314                 ret = drv->resume(sadev);
1315         return ret;
1316 }
1317 
1318 static void sa1111_bus_shutdown(struct device *dev)
1319 {
1320         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1321 
1322         if (drv && drv->shutdown)
1323                 drv->shutdown(SA1111_DEV(dev));
1324 }
1325 
1326 static int sa1111_bus_probe(struct device *dev)
1327 {
1328         struct sa1111_dev *sadev = SA1111_DEV(dev);
1329         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1330         int ret = -ENODEV;
1331 
1332         if (drv->probe)
1333                 ret = drv->probe(sadev);
1334         return ret;
1335 }
1336 
1337 static int sa1111_bus_remove(struct device *dev)
1338 {
1339         struct sa1111_dev *sadev = SA1111_DEV(dev);
1340         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1341         int ret = 0;
1342 
1343         if (drv->remove)
1344                 ret = drv->remove(sadev);
1345         return ret;
1346 }
1347 
1348 struct bus_type sa1111_bus_type = {
1349         .name           = "sa1111-rab",
1350         .match          = sa1111_match,
1351         .probe          = sa1111_bus_probe,
1352         .remove         = sa1111_bus_remove,
1353         .suspend        = sa1111_bus_suspend,
1354         .resume         = sa1111_bus_resume,
1355         .shutdown       = sa1111_bus_shutdown,
1356 };
1357 EXPORT_SYMBOL(sa1111_bus_type);
1358 
1359 int sa1111_driver_register(struct sa1111_driver *driver)
1360 {
1361         driver->drv.bus = &sa1111_bus_type;
1362         return driver_register(&driver->drv);
1363 }
1364 EXPORT_SYMBOL(sa1111_driver_register);
1365 
1366 void sa1111_driver_unregister(struct sa1111_driver *driver)
1367 {
1368         driver_unregister(&driver->drv);
1369 }
1370 EXPORT_SYMBOL(sa1111_driver_unregister);
1371 
1372 #ifdef CONFIG_DMABOUNCE
1373 /*
1374  * According to the "Intel StrongARM SA-1111 Microprocessor Companion
1375  * Chip Specification Update" (June 2000), erratum #7, there is a
1376  * significant bug in the SA1111 SDRAM shared memory controller.  If
1377  * an access to a region of memory above 1MB relative to the bank base,
1378  * it is important that address bit 10 _NOT_ be asserted. Depending
1379  * on the configuration of the RAM, bit 10 may correspond to one
1380  * of several different (processor-relative) address bits.
1381  *
1382  * This routine only identifies whether or not a given DMA address
1383  * is susceptible to the bug.
1384  *
1385  * This should only get called for sa1111_device types due to the
1386  * way we configure our device dma_masks.
1387  */
1388 static int sa1111_needs_bounce(struct device *dev, dma_addr_t addr, size_t size)
1389 {
1390         /*
1391          * Section 4.6 of the "Intel StrongARM SA-1111 Development Module
1392          * User's Guide" mentions that jumpers R51 and R52 control the
1393          * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or
1394          * SDRAM bank 1 on Neponset). The default configuration selects
1395          * Assabet, so any address in bank 1 is necessarily invalid.
1396          */
1397         return (machine_is_assabet() || machine_is_pfs168()) &&
1398                 (addr >= 0xc8000000 || (addr + size) >= 0xc8000000);
1399 }
1400 
1401 static int sa1111_notifier_call(struct notifier_block *n, unsigned long action,
1402         void *data)
1403 {
1404         struct sa1111_dev *dev = SA1111_DEV(data);
1405 
1406         switch (action) {
1407         case BUS_NOTIFY_ADD_DEVICE:
1408                 if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL) {
1409                         int ret = dmabounce_register_dev(&dev->dev, 1024, 4096,
1410                                         sa1111_needs_bounce);
1411                         if (ret)
1412                                 dev_err(&dev->dev, "failed to register with dmabounce: %d\n", ret);
1413                 }
1414                 break;
1415 
1416         case BUS_NOTIFY_DEL_DEVICE:
1417                 if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL)
1418                         dmabounce_unregister_dev(&dev->dev);
1419                 break;
1420         }
1421         return NOTIFY_OK;
1422 }
1423 
1424 static struct notifier_block sa1111_bus_notifier = {
1425         .notifier_call = sa1111_notifier_call,
1426 };
1427 #endif
1428 
1429 static int __init sa1111_init(void)
1430 {
1431         int ret = bus_register(&sa1111_bus_type);
1432 #ifdef CONFIG_DMABOUNCE
1433         if (ret == 0)
1434                 bus_register_notifier(&sa1111_bus_type, &sa1111_bus_notifier);
1435 #endif
1436         if (ret == 0)
1437                 platform_driver_register(&sa1111_device_driver);
1438         return ret;
1439 }
1440 
1441 static void __exit sa1111_exit(void)
1442 {
1443         platform_driver_unregister(&sa1111_device_driver);
1444 #ifdef CONFIG_DMABOUNCE
1445         bus_unregister_notifier(&sa1111_bus_type, &sa1111_bus_notifier);
1446 #endif
1447         bus_unregister(&sa1111_bus_type);
1448 }
1449 
1450 subsys_initcall(sa1111_init);
1451 module_exit(sa1111_exit);
1452 
1453 MODULE_DESCRIPTION("Intel Corporation SA1111 core driver");
1454 MODULE_LICENSE("GPL");
1455 

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