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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(BIT(IRQ_S0_READY_NINT & 31) |
476                       BIT(IRQ_S1_READY_NINT & 31),
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_clk;
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_clk:
803         clk_disable(sachip->clk);
804  err_unmap:
805         iounmap(sachip->base);
806  err_clk_unprep:
807         clk_unprepare(sachip->clk);
808  err_clkput:
809         clk_put(sachip->clk);
810  err_free:
811         kfree(sachip);
812         return ret;
813 }
814 
815 static int sa1111_remove_one(struct device *dev, void *data)
816 {
817         struct sa1111_dev *sadev = SA1111_DEV(dev);
818         device_del(&sadev->dev);
819         release_resource(&sadev->res);
820         put_device(&sadev->dev);
821         return 0;
822 }
823 
824 static void __sa1111_remove(struct sa1111 *sachip)
825 {
826         void __iomem *irqbase = sachip->base + SA1111_INTC;
827 
828         device_for_each_child(sachip->dev, NULL, sa1111_remove_one);
829 
830         /* disable all IRQs */
831         sa1111_writel(0, irqbase + SA1111_INTEN0);
832         sa1111_writel(0, irqbase + SA1111_INTEN1);
833         sa1111_writel(0, irqbase + SA1111_WAKEEN0);
834         sa1111_writel(0, irqbase + SA1111_WAKEEN1);
835 
836         clk_disable(sachip->clk);
837         clk_unprepare(sachip->clk);
838 
839         if (sachip->irq != NO_IRQ) {
840                 irq_set_chained_handler_and_data(sachip->irq, NULL, NULL);
841                 irq_free_descs(sachip->irq_base, SA1111_IRQ_NR);
842 
843                 release_mem_region(sachip->phys + SA1111_INTC, 512);
844         }
845 
846         iounmap(sachip->base);
847         clk_put(sachip->clk);
848         kfree(sachip);
849 }
850 
851 struct sa1111_save_data {
852         unsigned int    skcr;
853         unsigned int    skpcr;
854         unsigned int    skcdr;
855         unsigned char   skaud;
856         unsigned char   skpwm0;
857         unsigned char   skpwm1;
858 
859         /*
860          * Interrupt controller
861          */
862         unsigned int    intpol0;
863         unsigned int    intpol1;
864         unsigned int    inten0;
865         unsigned int    inten1;
866         unsigned int    wakepol0;
867         unsigned int    wakepol1;
868         unsigned int    wakeen0;
869         unsigned int    wakeen1;
870 };
871 
872 #ifdef CONFIG_PM
873 
874 static int sa1111_suspend_noirq(struct device *dev)
875 {
876         struct sa1111 *sachip = dev_get_drvdata(dev);
877         struct sa1111_save_data *save;
878         unsigned long flags;
879         unsigned int val;
880         void __iomem *base;
881 
882         save = kmalloc(sizeof(struct sa1111_save_data), GFP_KERNEL);
883         if (!save)
884                 return -ENOMEM;
885         sachip->saved_state = save;
886 
887         spin_lock_irqsave(&sachip->lock, flags);
888 
889         /*
890          * Save state.
891          */
892         base = sachip->base;
893         save->skcr     = sa1111_readl(base + SA1111_SKCR);
894         save->skpcr    = sa1111_readl(base + SA1111_SKPCR);
895         save->skcdr    = sa1111_readl(base + SA1111_SKCDR);
896         save->skaud    = sa1111_readl(base + SA1111_SKAUD);
897         save->skpwm0   = sa1111_readl(base + SA1111_SKPWM0);
898         save->skpwm1   = sa1111_readl(base + SA1111_SKPWM1);
899 
900         sa1111_writel(0, sachip->base + SA1111_SKPWM0);
901         sa1111_writel(0, sachip->base + SA1111_SKPWM1);
902 
903         base = sachip->base + SA1111_INTC;
904         save->intpol0  = sa1111_readl(base + SA1111_INTPOL0);
905         save->intpol1  = sa1111_readl(base + SA1111_INTPOL1);
906         save->inten0   = sa1111_readl(base + SA1111_INTEN0);
907         save->inten1   = sa1111_readl(base + SA1111_INTEN1);
908         save->wakepol0 = sa1111_readl(base + SA1111_WAKEPOL0);
909         save->wakepol1 = sa1111_readl(base + SA1111_WAKEPOL1);
910         save->wakeen0  = sa1111_readl(base + SA1111_WAKEEN0);
911         save->wakeen1  = sa1111_readl(base + SA1111_WAKEEN1);
912 
913         /*
914          * Disable.
915          */
916         val = sa1111_readl(sachip->base + SA1111_SKCR);
917         sa1111_writel(val | SKCR_SLEEP, sachip->base + SA1111_SKCR);
918 
919         clk_disable(sachip->clk);
920 
921         spin_unlock_irqrestore(&sachip->lock, flags);
922 
923 #ifdef CONFIG_ARCH_SA1100
924         sa1110_mb_disable();
925 #endif
926 
927         return 0;
928 }
929 
930 /*
931  *      sa1111_resume - Restore the SA1111 device state.
932  *      @dev: device to restore
933  *
934  *      Restore the general state of the SA1111; clock control and
935  *      interrupt controller.  Other parts of the SA1111 must be
936  *      restored by their respective drivers, and must be called
937  *      via LDM after this function.
938  */
939 static int sa1111_resume_noirq(struct device *dev)
940 {
941         struct sa1111 *sachip = dev_get_drvdata(dev);
942         struct sa1111_save_data *save;
943         unsigned long flags, id;
944         void __iomem *base;
945 
946         save = sachip->saved_state;
947         if (!save)
948                 return 0;
949 
950         /*
951          * Ensure that the SA1111 is still here.
952          * FIXME: shouldn't do this here.
953          */
954         id = sa1111_readl(sachip->base + SA1111_SKID);
955         if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
956                 __sa1111_remove(sachip);
957                 dev_set_drvdata(dev, NULL);
958                 kfree(save);
959                 return 0;
960         }
961 
962         /*
963          * First of all, wake up the chip.
964          */
965         sa1111_wake(sachip);
966 
967 #ifdef CONFIG_ARCH_SA1100
968         /* Enable the memory bus request/grant signals */
969         sa1110_mb_enable();
970 #endif
971 
972         /*
973          * Only lock for write ops. Also, sa1111_wake must be called with
974          * released spinlock!
975          */
976         spin_lock_irqsave(&sachip->lock, flags);
977 
978         sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN0);
979         sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN1);
980 
981         base = sachip->base;
982         sa1111_writel(save->skcr,     base + SA1111_SKCR);
983         sa1111_writel(save->skpcr,    base + SA1111_SKPCR);
984         sa1111_writel(save->skcdr,    base + SA1111_SKCDR);
985         sa1111_writel(save->skaud,    base + SA1111_SKAUD);
986         sa1111_writel(save->skpwm0,   base + SA1111_SKPWM0);
987         sa1111_writel(save->skpwm1,   base + SA1111_SKPWM1);
988 
989         base = sachip->base + SA1111_INTC;
990         sa1111_writel(save->intpol0,  base + SA1111_INTPOL0);
991         sa1111_writel(save->intpol1,  base + SA1111_INTPOL1);
992         sa1111_writel(save->inten0,   base + SA1111_INTEN0);
993         sa1111_writel(save->inten1,   base + SA1111_INTEN1);
994         sa1111_writel(save->wakepol0, base + SA1111_WAKEPOL0);
995         sa1111_writel(save->wakepol1, base + SA1111_WAKEPOL1);
996         sa1111_writel(save->wakeen0,  base + SA1111_WAKEEN0);
997         sa1111_writel(save->wakeen1,  base + SA1111_WAKEEN1);
998 
999         spin_unlock_irqrestore(&sachip->lock, flags);
1000 
1001         sachip->saved_state = NULL;
1002         kfree(save);
1003 
1004         return 0;
1005 }
1006 
1007 #else
1008 #define sa1111_suspend_noirq NULL
1009 #define sa1111_resume_noirq  NULL
1010 #endif
1011 
1012 static int sa1111_probe(struct platform_device *pdev)
1013 {
1014         struct resource *mem;
1015         int irq;
1016 
1017         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1018         if (!mem)
1019                 return -EINVAL;
1020         irq = platform_get_irq(pdev, 0);
1021         if (irq < 0)
1022                 return irq;
1023 
1024         return __sa1111_probe(&pdev->dev, mem, irq);
1025 }
1026 
1027 static int sa1111_remove(struct platform_device *pdev)
1028 {
1029         struct sa1111 *sachip = platform_get_drvdata(pdev);
1030 
1031         if (sachip) {
1032 #ifdef CONFIG_PM
1033                 kfree(sachip->saved_state);
1034                 sachip->saved_state = NULL;
1035 #endif
1036                 __sa1111_remove(sachip);
1037                 platform_set_drvdata(pdev, NULL);
1038         }
1039 
1040         return 0;
1041 }
1042 
1043 static struct dev_pm_ops sa1111_pm_ops = {
1044         .suspend_noirq = sa1111_suspend_noirq,
1045         .resume_noirq = sa1111_resume_noirq,
1046 };
1047 
1048 /*
1049  *      Not sure if this should be on the system bus or not yet.
1050  *      We really want some way to register a system device at
1051  *      the per-machine level, and then have this driver pick
1052  *      up the registered devices.
1053  *
1054  *      We also need to handle the SDRAM configuration for
1055  *      PXA250/SA1110 machine classes.
1056  */
1057 static struct platform_driver sa1111_device_driver = {
1058         .probe          = sa1111_probe,
1059         .remove         = sa1111_remove,
1060         .driver         = {
1061                 .name   = "sa1111",
1062                 .pm     = &sa1111_pm_ops,
1063         },
1064 };
1065 
1066 /*
1067  *      Get the parent device driver (us) structure
1068  *      from a child function device
1069  */
1070 static inline struct sa1111 *sa1111_chip_driver(struct sa1111_dev *sadev)
1071 {
1072         return (struct sa1111 *)dev_get_drvdata(sadev->dev.parent);
1073 }
1074 
1075 /*
1076  * The bits in the opdiv field are non-linear.
1077  */
1078 static unsigned char opdiv_table[] = { 1, 4, 2, 8 };
1079 
1080 static unsigned int __sa1111_pll_clock(struct sa1111 *sachip)
1081 {
1082         unsigned int skcdr, fbdiv, ipdiv, opdiv;
1083 
1084         skcdr = sa1111_readl(sachip->base + SA1111_SKCDR);
1085 
1086         fbdiv = (skcdr & 0x007f) + 2;
1087         ipdiv = ((skcdr & 0x0f80) >> 7) + 2;
1088         opdiv = opdiv_table[(skcdr & 0x3000) >> 12];
1089 
1090         return 3686400 * fbdiv / (ipdiv * opdiv);
1091 }
1092 
1093 /**
1094  *      sa1111_pll_clock - return the current PLL clock frequency.
1095  *      @sadev: SA1111 function block
1096  *
1097  *      BUG: we should look at SKCR.  We also blindly believe that
1098  *      the chip is being fed with the 3.6864MHz clock.
1099  *
1100  *      Returns the PLL clock in Hz.
1101  */
1102 unsigned int sa1111_pll_clock(struct sa1111_dev *sadev)
1103 {
1104         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1105 
1106         return __sa1111_pll_clock(sachip);
1107 }
1108 EXPORT_SYMBOL(sa1111_pll_clock);
1109 
1110 /**
1111  *      sa1111_select_audio_mode - select I2S or AC link mode
1112  *      @sadev: SA1111 function block
1113  *      @mode: One of %SA1111_AUDIO_ACLINK or %SA1111_AUDIO_I2S
1114  *
1115  *      Frob the SKCR to select AC Link mode or I2S mode for
1116  *      the audio block.
1117  */
1118 void sa1111_select_audio_mode(struct sa1111_dev *sadev, int mode)
1119 {
1120         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1121         unsigned long flags;
1122         unsigned int val;
1123 
1124         spin_lock_irqsave(&sachip->lock, flags);
1125 
1126         val = sa1111_readl(sachip->base + SA1111_SKCR);
1127         if (mode == SA1111_AUDIO_I2S) {
1128                 val &= ~SKCR_SELAC;
1129         } else {
1130                 val |= SKCR_SELAC;
1131         }
1132         sa1111_writel(val, sachip->base + SA1111_SKCR);
1133 
1134         spin_unlock_irqrestore(&sachip->lock, flags);
1135 }
1136 EXPORT_SYMBOL(sa1111_select_audio_mode);
1137 
1138 /**
1139  *      sa1111_set_audio_rate - set the audio sample rate
1140  *      @sadev: SA1111 SAC function block
1141  *      @rate: sample rate to select
1142  */
1143 int sa1111_set_audio_rate(struct sa1111_dev *sadev, int rate)
1144 {
1145         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1146         unsigned int div;
1147 
1148         if (sadev->devid != SA1111_DEVID_SAC)
1149                 return -EINVAL;
1150 
1151         div = (__sa1111_pll_clock(sachip) / 256 + rate / 2) / rate;
1152         if (div == 0)
1153                 div = 1;
1154         if (div > 128)
1155                 div = 128;
1156 
1157         sa1111_writel(div - 1, sachip->base + SA1111_SKAUD);
1158 
1159         return 0;
1160 }
1161 EXPORT_SYMBOL(sa1111_set_audio_rate);
1162 
1163 /**
1164  *      sa1111_get_audio_rate - get the audio sample rate
1165  *      @sadev: SA1111 SAC function block device
1166  */
1167 int sa1111_get_audio_rate(struct sa1111_dev *sadev)
1168 {
1169         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1170         unsigned long div;
1171 
1172         if (sadev->devid != SA1111_DEVID_SAC)
1173                 return -EINVAL;
1174 
1175         div = sa1111_readl(sachip->base + SA1111_SKAUD) + 1;
1176 
1177         return __sa1111_pll_clock(sachip) / (256 * div);
1178 }
1179 EXPORT_SYMBOL(sa1111_get_audio_rate);
1180 
1181 void sa1111_set_io_dir(struct sa1111_dev *sadev,
1182                        unsigned int bits, unsigned int dir,
1183                        unsigned int sleep_dir)
1184 {
1185         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1186         unsigned long flags;
1187         unsigned int val;
1188         void __iomem *gpio = sachip->base + SA1111_GPIO;
1189 
1190 #define MODIFY_BITS(port, mask, dir)            \
1191         if (mask) {                             \
1192                 val = sa1111_readl(port);       \
1193                 val &= ~(mask);                 \
1194                 val |= (dir) & (mask);          \
1195                 sa1111_writel(val, port);       \
1196         }
1197 
1198         spin_lock_irqsave(&sachip->lock, flags);
1199         MODIFY_BITS(gpio + SA1111_GPIO_PADDR, bits & 15, dir);
1200         MODIFY_BITS(gpio + SA1111_GPIO_PBDDR, (bits >> 8) & 255, dir >> 8);
1201         MODIFY_BITS(gpio + SA1111_GPIO_PCDDR, (bits >> 16) & 255, dir >> 16);
1202 
1203         MODIFY_BITS(gpio + SA1111_GPIO_PASDR, bits & 15, sleep_dir);
1204         MODIFY_BITS(gpio + SA1111_GPIO_PBSDR, (bits >> 8) & 255, sleep_dir >> 8);
1205         MODIFY_BITS(gpio + SA1111_GPIO_PCSDR, (bits >> 16) & 255, sleep_dir >> 16);
1206         spin_unlock_irqrestore(&sachip->lock, flags);
1207 }
1208 EXPORT_SYMBOL(sa1111_set_io_dir);
1209 
1210 void sa1111_set_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
1211 {
1212         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1213         unsigned long flags;
1214         unsigned int val;
1215         void __iomem *gpio = sachip->base + SA1111_GPIO;
1216 
1217         spin_lock_irqsave(&sachip->lock, flags);
1218         MODIFY_BITS(gpio + SA1111_GPIO_PADWR, bits & 15, v);
1219         MODIFY_BITS(gpio + SA1111_GPIO_PBDWR, (bits >> 8) & 255, v >> 8);
1220         MODIFY_BITS(gpio + SA1111_GPIO_PCDWR, (bits >> 16) & 255, v >> 16);
1221         spin_unlock_irqrestore(&sachip->lock, flags);
1222 }
1223 EXPORT_SYMBOL(sa1111_set_io);
1224 
1225 void sa1111_set_sleep_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
1226 {
1227         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1228         unsigned long flags;
1229         unsigned int val;
1230         void __iomem *gpio = sachip->base + SA1111_GPIO;
1231 
1232         spin_lock_irqsave(&sachip->lock, flags);
1233         MODIFY_BITS(gpio + SA1111_GPIO_PASSR, bits & 15, v);
1234         MODIFY_BITS(gpio + SA1111_GPIO_PBSSR, (bits >> 8) & 255, v >> 8);
1235         MODIFY_BITS(gpio + SA1111_GPIO_PCSSR, (bits >> 16) & 255, v >> 16);
1236         spin_unlock_irqrestore(&sachip->lock, flags);
1237 }
1238 EXPORT_SYMBOL(sa1111_set_sleep_io);
1239 
1240 /*
1241  * Individual device operations.
1242  */
1243 
1244 /**
1245  *      sa1111_enable_device - enable an on-chip SA1111 function block
1246  *      @sadev: SA1111 function block device to enable
1247  */
1248 int sa1111_enable_device(struct sa1111_dev *sadev)
1249 {
1250         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1251         unsigned long flags;
1252         unsigned int val;
1253         int ret = 0;
1254 
1255         if (sachip->pdata && sachip->pdata->enable)
1256                 ret = sachip->pdata->enable(sachip->pdata->data, sadev->devid);
1257 
1258         if (ret == 0) {
1259                 spin_lock_irqsave(&sachip->lock, flags);
1260                 val = sa1111_readl(sachip->base + SA1111_SKPCR);
1261                 sa1111_writel(val | sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
1262                 spin_unlock_irqrestore(&sachip->lock, flags);
1263         }
1264         return ret;
1265 }
1266 EXPORT_SYMBOL(sa1111_enable_device);
1267 
1268 /**
1269  *      sa1111_disable_device - disable an on-chip SA1111 function block
1270  *      @sadev: SA1111 function block device to disable
1271  */
1272 void sa1111_disable_device(struct sa1111_dev *sadev)
1273 {
1274         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1275         unsigned long flags;
1276         unsigned int val;
1277 
1278         spin_lock_irqsave(&sachip->lock, flags);
1279         val = sa1111_readl(sachip->base + SA1111_SKPCR);
1280         sa1111_writel(val & ~sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
1281         spin_unlock_irqrestore(&sachip->lock, flags);
1282 
1283         if (sachip->pdata && sachip->pdata->disable)
1284                 sachip->pdata->disable(sachip->pdata->data, sadev->devid);
1285 }
1286 EXPORT_SYMBOL(sa1111_disable_device);
1287 
1288 /*
1289  *      SA1111 "Register Access Bus."
1290  *
1291  *      We model this as a regular bus type, and hang devices directly
1292  *      off this.
1293  */
1294 static int sa1111_match(struct device *_dev, struct device_driver *_drv)
1295 {
1296         struct sa1111_dev *dev = SA1111_DEV(_dev);
1297         struct sa1111_driver *drv = SA1111_DRV(_drv);
1298 
1299         return !!(dev->devid & drv->devid);
1300 }
1301 
1302 static int sa1111_bus_suspend(struct device *dev, pm_message_t state)
1303 {
1304         struct sa1111_dev *sadev = SA1111_DEV(dev);
1305         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1306         int ret = 0;
1307 
1308         if (drv && drv->suspend)
1309                 ret = drv->suspend(sadev, state);
1310         return ret;
1311 }
1312 
1313 static int sa1111_bus_resume(struct device *dev)
1314 {
1315         struct sa1111_dev *sadev = SA1111_DEV(dev);
1316         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1317         int ret = 0;
1318 
1319         if (drv && drv->resume)
1320                 ret = drv->resume(sadev);
1321         return ret;
1322 }
1323 
1324 static void sa1111_bus_shutdown(struct device *dev)
1325 {
1326         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1327 
1328         if (drv && drv->shutdown)
1329                 drv->shutdown(SA1111_DEV(dev));
1330 }
1331 
1332 static int sa1111_bus_probe(struct device *dev)
1333 {
1334         struct sa1111_dev *sadev = SA1111_DEV(dev);
1335         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1336         int ret = -ENODEV;
1337 
1338         if (drv->probe)
1339                 ret = drv->probe(sadev);
1340         return ret;
1341 }
1342 
1343 static int sa1111_bus_remove(struct device *dev)
1344 {
1345         struct sa1111_dev *sadev = SA1111_DEV(dev);
1346         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1347         int ret = 0;
1348 
1349         if (drv->remove)
1350                 ret = drv->remove(sadev);
1351         return ret;
1352 }
1353 
1354 struct bus_type sa1111_bus_type = {
1355         .name           = "sa1111-rab",
1356         .match          = sa1111_match,
1357         .probe          = sa1111_bus_probe,
1358         .remove         = sa1111_bus_remove,
1359         .suspend        = sa1111_bus_suspend,
1360         .resume         = sa1111_bus_resume,
1361         .shutdown       = sa1111_bus_shutdown,
1362 };
1363 EXPORT_SYMBOL(sa1111_bus_type);
1364 
1365 int sa1111_driver_register(struct sa1111_driver *driver)
1366 {
1367         driver->drv.bus = &sa1111_bus_type;
1368         return driver_register(&driver->drv);
1369 }
1370 EXPORT_SYMBOL(sa1111_driver_register);
1371 
1372 void sa1111_driver_unregister(struct sa1111_driver *driver)
1373 {
1374         driver_unregister(&driver->drv);
1375 }
1376 EXPORT_SYMBOL(sa1111_driver_unregister);
1377 
1378 #ifdef CONFIG_DMABOUNCE
1379 /*
1380  * According to the "Intel StrongARM SA-1111 Microprocessor Companion
1381  * Chip Specification Update" (June 2000), erratum #7, there is a
1382  * significant bug in the SA1111 SDRAM shared memory controller.  If
1383  * an access to a region of memory above 1MB relative to the bank base,
1384  * it is important that address bit 10 _NOT_ be asserted. Depending
1385  * on the configuration of the RAM, bit 10 may correspond to one
1386  * of several different (processor-relative) address bits.
1387  *
1388  * This routine only identifies whether or not a given DMA address
1389  * is susceptible to the bug.
1390  *
1391  * This should only get called for sa1111_device types due to the
1392  * way we configure our device dma_masks.
1393  */
1394 static int sa1111_needs_bounce(struct device *dev, dma_addr_t addr, size_t size)
1395 {
1396         /*
1397          * Section 4.6 of the "Intel StrongARM SA-1111 Development Module
1398          * User's Guide" mentions that jumpers R51 and R52 control the
1399          * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or
1400          * SDRAM bank 1 on Neponset). The default configuration selects
1401          * Assabet, so any address in bank 1 is necessarily invalid.
1402          */
1403         return (machine_is_assabet() || machine_is_pfs168()) &&
1404                 (addr >= 0xc8000000 || (addr + size) >= 0xc8000000);
1405 }
1406 
1407 static int sa1111_notifier_call(struct notifier_block *n, unsigned long action,
1408         void *data)
1409 {
1410         struct sa1111_dev *dev = SA1111_DEV(data);
1411 
1412         switch (action) {
1413         case BUS_NOTIFY_ADD_DEVICE:
1414                 if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL) {
1415                         int ret = dmabounce_register_dev(&dev->dev, 1024, 4096,
1416                                         sa1111_needs_bounce);
1417                         if (ret)
1418                                 dev_err(&dev->dev, "failed to register with dmabounce: %d\n", ret);
1419                 }
1420                 break;
1421 
1422         case BUS_NOTIFY_DEL_DEVICE:
1423                 if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL)
1424                         dmabounce_unregister_dev(&dev->dev);
1425                 break;
1426         }
1427         return NOTIFY_OK;
1428 }
1429 
1430 static struct notifier_block sa1111_bus_notifier = {
1431         .notifier_call = sa1111_notifier_call,
1432 };
1433 #endif
1434 
1435 static int __init sa1111_init(void)
1436 {
1437         int ret = bus_register(&sa1111_bus_type);
1438 #ifdef CONFIG_DMABOUNCE
1439         if (ret == 0)
1440                 bus_register_notifier(&sa1111_bus_type, &sa1111_bus_notifier);
1441 #endif
1442         if (ret == 0)
1443                 platform_driver_register(&sa1111_device_driver);
1444         return ret;
1445 }
1446 
1447 static void __exit sa1111_exit(void)
1448 {
1449         platform_driver_unregister(&sa1111_device_driver);
1450 #ifdef CONFIG_DMABOUNCE
1451         bus_unregister_notifier(&sa1111_bus_type, &sa1111_bus_notifier);
1452 #endif
1453         bus_unregister(&sa1111_bus_type);
1454 }
1455 
1456 subsys_initcall(sa1111_init);
1457 module_exit(sa1111_exit);
1458 
1459 MODULE_DESCRIPTION("Intel Corporation SA1111 core driver");
1460 MODULE_LICENSE("GPL");
1461 

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