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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
200 sa1111_irq_handler(unsigned int irq, struct irq_desc *desc)
201 {
202         unsigned int stat0, stat1, i;
203         struct sa1111 *sachip = irq_get_handler_data(irq);
204         void __iomem *mapbase = sachip->base + SA1111_INTC;
205 
206         stat0 = sa1111_readl(mapbase + SA1111_INTSTATCLR0);
207         stat1 = sa1111_readl(mapbase + SA1111_INTSTATCLR1);
208 
209         sa1111_writel(stat0, mapbase + SA1111_INTSTATCLR0);
210 
211         desc->irq_data.chip->irq_ack(&desc->irq_data);
212 
213         sa1111_writel(stat1, mapbase + SA1111_INTSTATCLR1);
214 
215         if (stat0 == 0 && stat1 == 0) {
216                 do_bad_IRQ(irq, desc);
217                 return;
218         }
219 
220         for (i = 0; stat0; i++, stat0 >>= 1)
221                 if (stat0 & 1)
222                         generic_handle_irq(i + sachip->irq_base);
223 
224         for (i = 32; stat1; i++, stat1 >>= 1)
225                 if (stat1 & 1)
226                         generic_handle_irq(i + sachip->irq_base);
227 
228         /* For level-based interrupts */
229         desc->irq_data.chip->irq_unmask(&desc->irq_data);
230 }
231 
232 #define SA1111_IRQMASK_LO(x)    (1 << (x - sachip->irq_base))
233 #define SA1111_IRQMASK_HI(x)    (1 << (x - sachip->irq_base - 32))
234 
235 static void sa1111_ack_irq(struct irq_data *d)
236 {
237 }
238 
239 static void sa1111_mask_lowirq(struct irq_data *d)
240 {
241         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
242         void __iomem *mapbase = sachip->base + SA1111_INTC;
243         unsigned long ie0;
244 
245         ie0 = sa1111_readl(mapbase + SA1111_INTEN0);
246         ie0 &= ~SA1111_IRQMASK_LO(d->irq);
247         writel(ie0, mapbase + SA1111_INTEN0);
248 }
249 
250 static void sa1111_unmask_lowirq(struct irq_data *d)
251 {
252         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
253         void __iomem *mapbase = sachip->base + SA1111_INTC;
254         unsigned long ie0;
255 
256         ie0 = sa1111_readl(mapbase + SA1111_INTEN0);
257         ie0 |= SA1111_IRQMASK_LO(d->irq);
258         sa1111_writel(ie0, mapbase + SA1111_INTEN0);
259 }
260 
261 /*
262  * Attempt to re-trigger the interrupt.  The SA1111 contains a register
263  * (INTSET) which claims to do this.  However, in practice no amount of
264  * manipulation of INTEN and INTSET guarantees that the interrupt will
265  * be triggered.  In fact, its very difficult, if not impossible to get
266  * INTSET to re-trigger the interrupt.
267  */
268 static int sa1111_retrigger_lowirq(struct irq_data *d)
269 {
270         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
271         void __iomem *mapbase = sachip->base + SA1111_INTC;
272         unsigned int mask = SA1111_IRQMASK_LO(d->irq);
273         unsigned long ip0;
274         int i;
275 
276         ip0 = sa1111_readl(mapbase + SA1111_INTPOL0);
277         for (i = 0; i < 8; i++) {
278                 sa1111_writel(ip0 ^ mask, mapbase + SA1111_INTPOL0);
279                 sa1111_writel(ip0, mapbase + SA1111_INTPOL0);
280                 if (sa1111_readl(mapbase + SA1111_INTSTATCLR0) & mask)
281                         break;
282         }
283 
284         if (i == 8)
285                 pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n",
286                        d->irq);
287         return i == 8 ? -1 : 0;
288 }
289 
290 static int sa1111_type_lowirq(struct irq_data *d, unsigned int flags)
291 {
292         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
293         void __iomem *mapbase = sachip->base + SA1111_INTC;
294         unsigned int mask = SA1111_IRQMASK_LO(d->irq);
295         unsigned long ip0;
296 
297         if (flags == IRQ_TYPE_PROBE)
298                 return 0;
299 
300         if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0)
301                 return -EINVAL;
302 
303         ip0 = sa1111_readl(mapbase + SA1111_INTPOL0);
304         if (flags & IRQ_TYPE_EDGE_RISING)
305                 ip0 &= ~mask;
306         else
307                 ip0 |= mask;
308         sa1111_writel(ip0, mapbase + SA1111_INTPOL0);
309         sa1111_writel(ip0, mapbase + SA1111_WAKEPOL0);
310 
311         return 0;
312 }
313 
314 static int sa1111_wake_lowirq(struct irq_data *d, unsigned int on)
315 {
316         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
317         void __iomem *mapbase = sachip->base + SA1111_INTC;
318         unsigned int mask = SA1111_IRQMASK_LO(d->irq);
319         unsigned long we0;
320 
321         we0 = sa1111_readl(mapbase + SA1111_WAKEEN0);
322         if (on)
323                 we0 |= mask;
324         else
325                 we0 &= ~mask;
326         sa1111_writel(we0, mapbase + SA1111_WAKEEN0);
327 
328         return 0;
329 }
330 
331 static struct irq_chip sa1111_low_chip = {
332         .name           = "SA1111-l",
333         .irq_ack        = sa1111_ack_irq,
334         .irq_mask       = sa1111_mask_lowirq,
335         .irq_unmask     = sa1111_unmask_lowirq,
336         .irq_retrigger  = sa1111_retrigger_lowirq,
337         .irq_set_type   = sa1111_type_lowirq,
338         .irq_set_wake   = sa1111_wake_lowirq,
339 };
340 
341 static void sa1111_mask_highirq(struct irq_data *d)
342 {
343         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
344         void __iomem *mapbase = sachip->base + SA1111_INTC;
345         unsigned long ie1;
346 
347         ie1 = sa1111_readl(mapbase + SA1111_INTEN1);
348         ie1 &= ~SA1111_IRQMASK_HI(d->irq);
349         sa1111_writel(ie1, mapbase + SA1111_INTEN1);
350 }
351 
352 static void sa1111_unmask_highirq(struct irq_data *d)
353 {
354         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
355         void __iomem *mapbase = sachip->base + SA1111_INTC;
356         unsigned long ie1;
357 
358         ie1 = sa1111_readl(mapbase + SA1111_INTEN1);
359         ie1 |= SA1111_IRQMASK_HI(d->irq);
360         sa1111_writel(ie1, mapbase + SA1111_INTEN1);
361 }
362 
363 /*
364  * Attempt to re-trigger the interrupt.  The SA1111 contains a register
365  * (INTSET) which claims to do this.  However, in practice no amount of
366  * manipulation of INTEN and INTSET guarantees that the interrupt will
367  * be triggered.  In fact, its very difficult, if not impossible to get
368  * INTSET to re-trigger the interrupt.
369  */
370 static int sa1111_retrigger_highirq(struct irq_data *d)
371 {
372         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
373         void __iomem *mapbase = sachip->base + SA1111_INTC;
374         unsigned int mask = SA1111_IRQMASK_HI(d->irq);
375         unsigned long ip1;
376         int i;
377 
378         ip1 = sa1111_readl(mapbase + SA1111_INTPOL1);
379         for (i = 0; i < 8; i++) {
380                 sa1111_writel(ip1 ^ mask, mapbase + SA1111_INTPOL1);
381                 sa1111_writel(ip1, mapbase + SA1111_INTPOL1);
382                 if (sa1111_readl(mapbase + SA1111_INTSTATCLR1) & mask)
383                         break;
384         }
385 
386         if (i == 8)
387                 pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n",
388                        d->irq);
389         return i == 8 ? -1 : 0;
390 }
391 
392 static int sa1111_type_highirq(struct irq_data *d, unsigned int flags)
393 {
394         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
395         void __iomem *mapbase = sachip->base + SA1111_INTC;
396         unsigned int mask = SA1111_IRQMASK_HI(d->irq);
397         unsigned long ip1;
398 
399         if (flags == IRQ_TYPE_PROBE)
400                 return 0;
401 
402         if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0)
403                 return -EINVAL;
404 
405         ip1 = sa1111_readl(mapbase + SA1111_INTPOL1);
406         if (flags & IRQ_TYPE_EDGE_RISING)
407                 ip1 &= ~mask;
408         else
409                 ip1 |= mask;
410         sa1111_writel(ip1, mapbase + SA1111_INTPOL1);
411         sa1111_writel(ip1, mapbase + SA1111_WAKEPOL1);
412 
413         return 0;
414 }
415 
416 static int sa1111_wake_highirq(struct irq_data *d, unsigned int on)
417 {
418         struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
419         void __iomem *mapbase = sachip->base + SA1111_INTC;
420         unsigned int mask = SA1111_IRQMASK_HI(d->irq);
421         unsigned long we1;
422 
423         we1 = sa1111_readl(mapbase + SA1111_WAKEEN1);
424         if (on)
425                 we1 |= mask;
426         else
427                 we1 &= ~mask;
428         sa1111_writel(we1, mapbase + SA1111_WAKEEN1);
429 
430         return 0;
431 }
432 
433 static struct irq_chip sa1111_high_chip = {
434         .name           = "SA1111-h",
435         .irq_ack        = sa1111_ack_irq,
436         .irq_mask       = sa1111_mask_highirq,
437         .irq_unmask     = sa1111_unmask_highirq,
438         .irq_retrigger  = sa1111_retrigger_highirq,
439         .irq_set_type   = sa1111_type_highirq,
440         .irq_set_wake   = sa1111_wake_highirq,
441 };
442 
443 static int sa1111_setup_irq(struct sa1111 *sachip, unsigned irq_base)
444 {
445         void __iomem *irqbase = sachip->base + SA1111_INTC;
446         unsigned i, irq;
447         int ret;
448 
449         /*
450          * We're guaranteed that this region hasn't been taken.
451          */
452         request_mem_region(sachip->phys + SA1111_INTC, 512, "irq");
453 
454         ret = irq_alloc_descs(-1, irq_base, SA1111_IRQ_NR, -1);
455         if (ret <= 0) {
456                 dev_err(sachip->dev, "unable to allocate %u irqs: %d\n",
457                         SA1111_IRQ_NR, ret);
458                 if (ret == 0)
459                         ret = -EINVAL;
460                 return ret;
461         }
462 
463         sachip->irq_base = ret;
464 
465         /* disable all IRQs */
466         sa1111_writel(0, irqbase + SA1111_INTEN0);
467         sa1111_writel(0, irqbase + SA1111_INTEN1);
468         sa1111_writel(0, irqbase + SA1111_WAKEEN0);
469         sa1111_writel(0, irqbase + SA1111_WAKEEN1);
470 
471         /*
472          * detect on rising edge.  Note: Feb 2001 Errata for SA1111
473          * specifies that S0ReadyInt and S1ReadyInt should be '1'.
474          */
475         sa1111_writel(0, irqbase + SA1111_INTPOL0);
476         sa1111_writel(SA1111_IRQMASK_HI(IRQ_S0_READY_NINT) |
477                       SA1111_IRQMASK_HI(IRQ_S1_READY_NINT),
478                       irqbase + SA1111_INTPOL1);
479 
480         /* clear all IRQs */
481         sa1111_writel(~0, irqbase + SA1111_INTSTATCLR0);
482         sa1111_writel(~0, irqbase + SA1111_INTSTATCLR1);
483 
484         for (i = IRQ_GPAIN0; i <= SSPROR; i++) {
485                 irq = sachip->irq_base + i;
486                 irq_set_chip_and_handler(irq, &sa1111_low_chip,
487                                          handle_edge_irq);
488                 irq_set_chip_data(irq, sachip);
489                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
490         }
491 
492         for (i = AUDXMTDMADONEA; i <= IRQ_S1_BVD1_STSCHG; i++) {
493                 irq = sachip->irq_base + i;
494                 irq_set_chip_and_handler(irq, &sa1111_high_chip,
495                                          handle_edge_irq);
496                 irq_set_chip_data(irq, sachip);
497                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
498         }
499 
500         /*
501          * Register SA1111 interrupt
502          */
503         irq_set_irq_type(sachip->irq, IRQ_TYPE_EDGE_RISING);
504         irq_set_handler_data(sachip->irq, sachip);
505         irq_set_chained_handler(sachip->irq, sa1111_irq_handler);
506 
507         dev_info(sachip->dev, "Providing IRQ%u-%u\n",
508                 sachip->irq_base, sachip->irq_base + SA1111_IRQ_NR - 1);
509 
510         return 0;
511 }
512 
513 /*
514  * Bring the SA1111 out of reset.  This requires a set procedure:
515  *  1. nRESET asserted (by hardware)
516  *  2. CLK turned on from SA1110
517  *  3. nRESET deasserted
518  *  4. VCO turned on, PLL_BYPASS turned off
519  *  5. Wait lock time, then assert RCLKEn
520  *  7. PCR set to allow clocking of individual functions
521  *
522  * Until we've done this, the only registers we can access are:
523  *   SBI_SKCR
524  *   SBI_SMCR
525  *   SBI_SKID
526  */
527 static void sa1111_wake(struct sa1111 *sachip)
528 {
529         unsigned long flags, r;
530 
531         spin_lock_irqsave(&sachip->lock, flags);
532 
533         clk_enable(sachip->clk);
534 
535         /*
536          * Turn VCO on, and disable PLL Bypass.
537          */
538         r = sa1111_readl(sachip->base + SA1111_SKCR);
539         r &= ~SKCR_VCO_OFF;
540         sa1111_writel(r, sachip->base + SA1111_SKCR);
541         r |= SKCR_PLL_BYPASS | SKCR_OE_EN;
542         sa1111_writel(r, sachip->base + SA1111_SKCR);
543 
544         /*
545          * Wait lock time.  SA1111 manual _doesn't_
546          * specify a figure for this!  We choose 100us.
547          */
548         udelay(100);
549 
550         /*
551          * Enable RCLK.  We also ensure that RDYEN is set.
552          */
553         r |= SKCR_RCLKEN | SKCR_RDYEN;
554         sa1111_writel(r, sachip->base + SA1111_SKCR);
555 
556         /*
557          * Wait 14 RCLK cycles for the chip to finish coming out
558          * of reset. (RCLK=24MHz).  This is 590ns.
559          */
560         udelay(1);
561 
562         /*
563          * Ensure all clocks are initially off.
564          */
565         sa1111_writel(0, sachip->base + SA1111_SKPCR);
566 
567         spin_unlock_irqrestore(&sachip->lock, flags);
568 }
569 
570 #ifdef CONFIG_ARCH_SA1100
571 
572 static u32 sa1111_dma_mask[] = {
573         ~0,
574         ~(1 << 20),
575         ~(1 << 23),
576         ~(1 << 24),
577         ~(1 << 25),
578         ~(1 << 20),
579         ~(1 << 20),
580         0,
581 };
582 
583 /*
584  * Configure the SA1111 shared memory controller.
585  */
586 void
587 sa1111_configure_smc(struct sa1111 *sachip, int sdram, unsigned int drac,
588                      unsigned int cas_latency)
589 {
590         unsigned int smcr = SMCR_DTIM | SMCR_MBGE | FInsrt(drac, SMCR_DRAC);
591 
592         if (cas_latency == 3)
593                 smcr |= SMCR_CLAT;
594 
595         sa1111_writel(smcr, sachip->base + SA1111_SMCR);
596 
597         /*
598          * Now clear the bits in the DMA mask to work around the SA1111
599          * DMA erratum (Intel StrongARM SA-1111 Microprocessor Companion
600          * Chip Specification Update, June 2000, Erratum #7).
601          */
602         if (sachip->dev->dma_mask)
603                 *sachip->dev->dma_mask &= sa1111_dma_mask[drac >> 2];
604 
605         sachip->dev->coherent_dma_mask &= sa1111_dma_mask[drac >> 2];
606 }
607 #endif
608 
609 static void sa1111_dev_release(struct device *_dev)
610 {
611         struct sa1111_dev *dev = SA1111_DEV(_dev);
612 
613         kfree(dev);
614 }
615 
616 static int
617 sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent,
618                       struct sa1111_dev_info *info)
619 {
620         struct sa1111_dev *dev;
621         unsigned i;
622         int ret;
623 
624         dev = kzalloc(sizeof(struct sa1111_dev), GFP_KERNEL);
625         if (!dev) {
626                 ret = -ENOMEM;
627                 goto err_alloc;
628         }
629 
630         device_initialize(&dev->dev);
631         dev_set_name(&dev->dev, "%4.4lx", info->offset);
632         dev->devid       = info->devid;
633         dev->dev.parent  = sachip->dev;
634         dev->dev.bus     = &sa1111_bus_type;
635         dev->dev.release = sa1111_dev_release;
636         dev->res.start   = sachip->phys + info->offset;
637         dev->res.end     = dev->res.start + 511;
638         dev->res.name    = dev_name(&dev->dev);
639         dev->res.flags   = IORESOURCE_MEM;
640         dev->mapbase     = sachip->base + info->offset;
641         dev->skpcr_mask  = info->skpcr_mask;
642 
643         for (i = 0; i < ARRAY_SIZE(info->irq); i++)
644                 dev->irq[i] = sachip->irq_base + info->irq[i];
645 
646         /*
647          * If the parent device has a DMA mask associated with it, and
648          * this child supports DMA, propagate it down to the children.
649          */
650         if (info->dma && sachip->dev->dma_mask) {
651                 dev->dma_mask = *sachip->dev->dma_mask;
652                 dev->dev.dma_mask = &dev->dma_mask;
653                 dev->dev.coherent_dma_mask = sachip->dev->coherent_dma_mask;
654         }
655 
656         ret = request_resource(parent, &dev->res);
657         if (ret) {
658                 dev_err(sachip->dev, "failed to allocate resource for %s\n",
659                         dev->res.name);
660                 goto err_resource;
661         }
662 
663         ret = device_add(&dev->dev);
664         if (ret)
665                 goto err_add;
666         return 0;
667 
668  err_add:
669         release_resource(&dev->res);
670  err_resource:
671         put_device(&dev->dev);
672  err_alloc:
673         return ret;
674 }
675 
676 /**
677  *      sa1111_probe - probe for a single SA1111 chip.
678  *      @phys_addr: physical address of device.
679  *
680  *      Probe for a SA1111 chip.  This must be called
681  *      before any other SA1111-specific code.
682  *
683  *      Returns:
684  *      %-ENODEV        device not found.
685  *      %-EBUSY         physical address already marked in-use.
686  *      %-EINVAL        no platform data passed
687  *      %0              successful.
688  */
689 static int __sa1111_probe(struct device *me, struct resource *mem, int irq)
690 {
691         struct sa1111_platform_data *pd = me->platform_data;
692         struct sa1111 *sachip;
693         unsigned long id;
694         unsigned int has_devs;
695         int i, ret = -ENODEV;
696 
697         if (!pd)
698                 return -EINVAL;
699 
700         sachip = kzalloc(sizeof(struct sa1111), GFP_KERNEL);
701         if (!sachip)
702                 return -ENOMEM;
703 
704         sachip->clk = clk_get(me, "SA1111_CLK");
705         if (IS_ERR(sachip->clk)) {
706                 ret = PTR_ERR(sachip->clk);
707                 goto err_free;
708         }
709 
710         ret = clk_prepare(sachip->clk);
711         if (ret)
712                 goto err_clkput;
713 
714         spin_lock_init(&sachip->lock);
715 
716         sachip->dev = me;
717         dev_set_drvdata(sachip->dev, sachip);
718 
719         sachip->pdata = pd;
720         sachip->phys = mem->start;
721         sachip->irq = irq;
722 
723         /*
724          * Map the whole region.  This also maps the
725          * registers for our children.
726          */
727         sachip->base = ioremap(mem->start, PAGE_SIZE * 2);
728         if (!sachip->base) {
729                 ret = -ENOMEM;
730                 goto err_clk_unprep;
731         }
732 
733         /*
734          * Probe for the chip.  Only touch the SBI registers.
735          */
736         id = sa1111_readl(sachip->base + SA1111_SKID);
737         if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
738                 printk(KERN_DEBUG "SA1111 not detected: ID = %08lx\n", id);
739                 ret = -ENODEV;
740                 goto err_unmap;
741         }
742 
743         pr_info("SA1111 Microprocessor Companion Chip: silicon revision %lx, metal revision %lx\n",
744                 (id & SKID_SIREV_MASK) >> 4, id & SKID_MTREV_MASK);
745 
746         /*
747          * We found it.  Wake the chip up, and initialise.
748          */
749         sa1111_wake(sachip);
750 
751         /*
752          * The interrupt controller must be initialised before any
753          * other device to ensure that the interrupts are available.
754          */
755         if (sachip->irq != NO_IRQ) {
756                 ret = sa1111_setup_irq(sachip, pd->irq_base);
757                 if (ret)
758                         goto err_unmap;
759         }
760 
761 #ifdef CONFIG_ARCH_SA1100
762         {
763         unsigned int val;
764 
765         /*
766          * The SDRAM configuration of the SA1110 and the SA1111 must
767          * match.  This is very important to ensure that SA1111 accesses
768          * don't corrupt the SDRAM.  Note that this ungates the SA1111's
769          * MBGNT signal, so we must have called sa1110_mb_disable()
770          * beforehand.
771          */
772         sa1111_configure_smc(sachip, 1,
773                              FExtr(MDCNFG, MDCNFG_SA1110_DRAC0),
774                              FExtr(MDCNFG, MDCNFG_SA1110_TDL0));
775 
776         /*
777          * We only need to turn on DCLK whenever we want to use the
778          * DMA.  It can otherwise be held firmly in the off position.
779          * (currently, we always enable it.)
780          */
781         val = sa1111_readl(sachip->base + SA1111_SKPCR);
782         sa1111_writel(val | SKPCR_DCLKEN, sachip->base + SA1111_SKPCR);
783 
784         /*
785          * Enable the SA1110 memory bus request and grant signals.
786          */
787         sa1110_mb_enable();
788         }
789 #endif
790 
791         g_sa1111 = sachip;
792 
793         has_devs = ~0;
794         if (pd)
795                 has_devs &= ~pd->disable_devs;
796 
797         for (i = 0; i < ARRAY_SIZE(sa1111_devices); i++)
798                 if (sa1111_devices[i].devid & has_devs)
799                         sa1111_init_one_child(sachip, mem, &sa1111_devices[i]);
800 
801         return 0;
802 
803  err_unmap:
804         iounmap(sachip->base);
805  err_clk_unprep:
806         clk_unprepare(sachip->clk);
807  err_clkput:
808         clk_put(sachip->clk);
809  err_free:
810         kfree(sachip);
811         return ret;
812 }
813 
814 static int sa1111_remove_one(struct device *dev, void *data)
815 {
816         struct sa1111_dev *sadev = SA1111_DEV(dev);
817         device_del(&sadev->dev);
818         release_resource(&sadev->res);
819         put_device(&sadev->dev);
820         return 0;
821 }
822 
823 static void __sa1111_remove(struct sa1111 *sachip)
824 {
825         void __iomem *irqbase = sachip->base + SA1111_INTC;
826 
827         device_for_each_child(sachip->dev, NULL, sa1111_remove_one);
828 
829         /* disable all IRQs */
830         sa1111_writel(0, irqbase + SA1111_INTEN0);
831         sa1111_writel(0, irqbase + SA1111_INTEN1);
832         sa1111_writel(0, irqbase + SA1111_WAKEEN0);
833         sa1111_writel(0, irqbase + SA1111_WAKEEN1);
834 
835         clk_disable(sachip->clk);
836         clk_unprepare(sachip->clk);
837 
838         if (sachip->irq != NO_IRQ) {
839                 irq_set_chained_handler(sachip->irq, NULL);
840                 irq_set_handler_data(sachip->irq, 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(struct platform_device *dev, pm_message_t state)
875 {
876         struct sa1111 *sachip = platform_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(struct platform_device *dev)
940 {
941         struct sa1111 *sachip = platform_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                 platform_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 NULL
1009 #define sa1111_resume  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 -ENXIO;
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 /*
1044  *      Not sure if this should be on the system bus or not yet.
1045  *      We really want some way to register a system device at
1046  *      the per-machine level, and then have this driver pick
1047  *      up the registered devices.
1048  *
1049  *      We also need to handle the SDRAM configuration for
1050  *      PXA250/SA1110 machine classes.
1051  */
1052 static struct platform_driver sa1111_device_driver = {
1053         .probe          = sa1111_probe,
1054         .remove         = sa1111_remove,
1055         .suspend        = sa1111_suspend,
1056         .resume         = sa1111_resume,
1057         .driver         = {
1058                 .name   = "sa1111",
1059         },
1060 };
1061 
1062 /*
1063  *      Get the parent device driver (us) structure
1064  *      from a child function device
1065  */
1066 static inline struct sa1111 *sa1111_chip_driver(struct sa1111_dev *sadev)
1067 {
1068         return (struct sa1111 *)dev_get_drvdata(sadev->dev.parent);
1069 }
1070 
1071 /*
1072  * The bits in the opdiv field are non-linear.
1073  */
1074 static unsigned char opdiv_table[] = { 1, 4, 2, 8 };
1075 
1076 static unsigned int __sa1111_pll_clock(struct sa1111 *sachip)
1077 {
1078         unsigned int skcdr, fbdiv, ipdiv, opdiv;
1079 
1080         skcdr = sa1111_readl(sachip->base + SA1111_SKCDR);
1081 
1082         fbdiv = (skcdr & 0x007f) + 2;
1083         ipdiv = ((skcdr & 0x0f80) >> 7) + 2;
1084         opdiv = opdiv_table[(skcdr & 0x3000) >> 12];
1085 
1086         return 3686400 * fbdiv / (ipdiv * opdiv);
1087 }
1088 
1089 /**
1090  *      sa1111_pll_clock - return the current PLL clock frequency.
1091  *      @sadev: SA1111 function block
1092  *
1093  *      BUG: we should look at SKCR.  We also blindly believe that
1094  *      the chip is being fed with the 3.6864MHz clock.
1095  *
1096  *      Returns the PLL clock in Hz.
1097  */
1098 unsigned int sa1111_pll_clock(struct sa1111_dev *sadev)
1099 {
1100         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1101 
1102         return __sa1111_pll_clock(sachip);
1103 }
1104 EXPORT_SYMBOL(sa1111_pll_clock);
1105 
1106 /**
1107  *      sa1111_select_audio_mode - select I2S or AC link mode
1108  *      @sadev: SA1111 function block
1109  *      @mode: One of %SA1111_AUDIO_ACLINK or %SA1111_AUDIO_I2S
1110  *
1111  *      Frob the SKCR to select AC Link mode or I2S mode for
1112  *      the audio block.
1113  */
1114 void sa1111_select_audio_mode(struct sa1111_dev *sadev, int mode)
1115 {
1116         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1117         unsigned long flags;
1118         unsigned int val;
1119 
1120         spin_lock_irqsave(&sachip->lock, flags);
1121 
1122         val = sa1111_readl(sachip->base + SA1111_SKCR);
1123         if (mode == SA1111_AUDIO_I2S) {
1124                 val &= ~SKCR_SELAC;
1125         } else {
1126                 val |= SKCR_SELAC;
1127         }
1128         sa1111_writel(val, sachip->base + SA1111_SKCR);
1129 
1130         spin_unlock_irqrestore(&sachip->lock, flags);
1131 }
1132 EXPORT_SYMBOL(sa1111_select_audio_mode);
1133 
1134 /**
1135  *      sa1111_set_audio_rate - set the audio sample rate
1136  *      @sadev: SA1111 SAC function block
1137  *      @rate: sample rate to select
1138  */
1139 int sa1111_set_audio_rate(struct sa1111_dev *sadev, int rate)
1140 {
1141         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1142         unsigned int div;
1143 
1144         if (sadev->devid != SA1111_DEVID_SAC)
1145                 return -EINVAL;
1146 
1147         div = (__sa1111_pll_clock(sachip) / 256 + rate / 2) / rate;
1148         if (div == 0)
1149                 div = 1;
1150         if (div > 128)
1151                 div = 128;
1152 
1153         sa1111_writel(div - 1, sachip->base + SA1111_SKAUD);
1154 
1155         return 0;
1156 }
1157 EXPORT_SYMBOL(sa1111_set_audio_rate);
1158 
1159 /**
1160  *      sa1111_get_audio_rate - get the audio sample rate
1161  *      @sadev: SA1111 SAC function block device
1162  */
1163 int sa1111_get_audio_rate(struct sa1111_dev *sadev)
1164 {
1165         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1166         unsigned long div;
1167 
1168         if (sadev->devid != SA1111_DEVID_SAC)
1169                 return -EINVAL;
1170 
1171         div = sa1111_readl(sachip->base + SA1111_SKAUD) + 1;
1172 
1173         return __sa1111_pll_clock(sachip) / (256 * div);
1174 }
1175 EXPORT_SYMBOL(sa1111_get_audio_rate);
1176 
1177 void sa1111_set_io_dir(struct sa1111_dev *sadev,
1178                        unsigned int bits, unsigned int dir,
1179                        unsigned int sleep_dir)
1180 {
1181         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1182         unsigned long flags;
1183         unsigned int val;
1184         void __iomem *gpio = sachip->base + SA1111_GPIO;
1185 
1186 #define MODIFY_BITS(port, mask, dir)            \
1187         if (mask) {                             \
1188                 val = sa1111_readl(port);       \
1189                 val &= ~(mask);                 \
1190                 val |= (dir) & (mask);          \
1191                 sa1111_writel(val, port);       \
1192         }
1193 
1194         spin_lock_irqsave(&sachip->lock, flags);
1195         MODIFY_BITS(gpio + SA1111_GPIO_PADDR, bits & 15, dir);
1196         MODIFY_BITS(gpio + SA1111_GPIO_PBDDR, (bits >> 8) & 255, dir >> 8);
1197         MODIFY_BITS(gpio + SA1111_GPIO_PCDDR, (bits >> 16) & 255, dir >> 16);
1198 
1199         MODIFY_BITS(gpio + SA1111_GPIO_PASDR, bits & 15, sleep_dir);
1200         MODIFY_BITS(gpio + SA1111_GPIO_PBSDR, (bits >> 8) & 255, sleep_dir >> 8);
1201         MODIFY_BITS(gpio + SA1111_GPIO_PCSDR, (bits >> 16) & 255, sleep_dir >> 16);
1202         spin_unlock_irqrestore(&sachip->lock, flags);
1203 }
1204 EXPORT_SYMBOL(sa1111_set_io_dir);
1205 
1206 void sa1111_set_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
1207 {
1208         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1209         unsigned long flags;
1210         unsigned int val;
1211         void __iomem *gpio = sachip->base + SA1111_GPIO;
1212 
1213         spin_lock_irqsave(&sachip->lock, flags);
1214         MODIFY_BITS(gpio + SA1111_GPIO_PADWR, bits & 15, v);
1215         MODIFY_BITS(gpio + SA1111_GPIO_PBDWR, (bits >> 8) & 255, v >> 8);
1216         MODIFY_BITS(gpio + SA1111_GPIO_PCDWR, (bits >> 16) & 255, v >> 16);
1217         spin_unlock_irqrestore(&sachip->lock, flags);
1218 }
1219 EXPORT_SYMBOL(sa1111_set_io);
1220 
1221 void sa1111_set_sleep_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
1222 {
1223         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1224         unsigned long flags;
1225         unsigned int val;
1226         void __iomem *gpio = sachip->base + SA1111_GPIO;
1227 
1228         spin_lock_irqsave(&sachip->lock, flags);
1229         MODIFY_BITS(gpio + SA1111_GPIO_PASSR, bits & 15, v);
1230         MODIFY_BITS(gpio + SA1111_GPIO_PBSSR, (bits >> 8) & 255, v >> 8);
1231         MODIFY_BITS(gpio + SA1111_GPIO_PCSSR, (bits >> 16) & 255, v >> 16);
1232         spin_unlock_irqrestore(&sachip->lock, flags);
1233 }
1234 EXPORT_SYMBOL(sa1111_set_sleep_io);
1235 
1236 /*
1237  * Individual device operations.
1238  */
1239 
1240 /**
1241  *      sa1111_enable_device - enable an on-chip SA1111 function block
1242  *      @sadev: SA1111 function block device to enable
1243  */
1244 int sa1111_enable_device(struct sa1111_dev *sadev)
1245 {
1246         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1247         unsigned long flags;
1248         unsigned int val;
1249         int ret = 0;
1250 
1251         if (sachip->pdata && sachip->pdata->enable)
1252                 ret = sachip->pdata->enable(sachip->pdata->data, sadev->devid);
1253 
1254         if (ret == 0) {
1255                 spin_lock_irqsave(&sachip->lock, flags);
1256                 val = sa1111_readl(sachip->base + SA1111_SKPCR);
1257                 sa1111_writel(val | sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
1258                 spin_unlock_irqrestore(&sachip->lock, flags);
1259         }
1260         return ret;
1261 }
1262 EXPORT_SYMBOL(sa1111_enable_device);
1263 
1264 /**
1265  *      sa1111_disable_device - disable an on-chip SA1111 function block
1266  *      @sadev: SA1111 function block device to disable
1267  */
1268 void sa1111_disable_device(struct sa1111_dev *sadev)
1269 {
1270         struct sa1111 *sachip = sa1111_chip_driver(sadev);
1271         unsigned long flags;
1272         unsigned int val;
1273 
1274         spin_lock_irqsave(&sachip->lock, flags);
1275         val = sa1111_readl(sachip->base + SA1111_SKPCR);
1276         sa1111_writel(val & ~sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
1277         spin_unlock_irqrestore(&sachip->lock, flags);
1278 
1279         if (sachip->pdata && sachip->pdata->disable)
1280                 sachip->pdata->disable(sachip->pdata->data, sadev->devid);
1281 }
1282 EXPORT_SYMBOL(sa1111_disable_device);
1283 
1284 /*
1285  *      SA1111 "Register Access Bus."
1286  *
1287  *      We model this as a regular bus type, and hang devices directly
1288  *      off this.
1289  */
1290 static int sa1111_match(struct device *_dev, struct device_driver *_drv)
1291 {
1292         struct sa1111_dev *dev = SA1111_DEV(_dev);
1293         struct sa1111_driver *drv = SA1111_DRV(_drv);
1294 
1295         return dev->devid & drv->devid;
1296 }
1297 
1298 static int sa1111_bus_suspend(struct device *dev, pm_message_t state)
1299 {
1300         struct sa1111_dev *sadev = SA1111_DEV(dev);
1301         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1302         int ret = 0;
1303 
1304         if (drv && drv->suspend)
1305                 ret = drv->suspend(sadev, state);
1306         return ret;
1307 }
1308 
1309 static int sa1111_bus_resume(struct device *dev)
1310 {
1311         struct sa1111_dev *sadev = SA1111_DEV(dev);
1312         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1313         int ret = 0;
1314 
1315         if (drv && drv->resume)
1316                 ret = drv->resume(sadev);
1317         return ret;
1318 }
1319 
1320 static void sa1111_bus_shutdown(struct device *dev)
1321 {
1322         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1323 
1324         if (drv && drv->shutdown)
1325                 drv->shutdown(SA1111_DEV(dev));
1326 }
1327 
1328 static int sa1111_bus_probe(struct device *dev)
1329 {
1330         struct sa1111_dev *sadev = SA1111_DEV(dev);
1331         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1332         int ret = -ENODEV;
1333 
1334         if (drv->probe)
1335                 ret = drv->probe(sadev);
1336         return ret;
1337 }
1338 
1339 static int sa1111_bus_remove(struct device *dev)
1340 {
1341         struct sa1111_dev *sadev = SA1111_DEV(dev);
1342         struct sa1111_driver *drv = SA1111_DRV(dev->driver);
1343         int ret = 0;
1344 
1345         if (drv->remove)
1346                 ret = drv->remove(sadev);
1347         return ret;
1348 }
1349 
1350 struct bus_type sa1111_bus_type = {
1351         .name           = "sa1111-rab",
1352         .match          = sa1111_match,
1353         .probe          = sa1111_bus_probe,
1354         .remove         = sa1111_bus_remove,
1355         .suspend        = sa1111_bus_suspend,
1356         .resume         = sa1111_bus_resume,
1357         .shutdown       = sa1111_bus_shutdown,
1358 };
1359 EXPORT_SYMBOL(sa1111_bus_type);
1360 
1361 int sa1111_driver_register(struct sa1111_driver *driver)
1362 {
1363         driver->drv.bus = &sa1111_bus_type;
1364         return driver_register(&driver->drv);
1365 }
1366 EXPORT_SYMBOL(sa1111_driver_register);
1367 
1368 void sa1111_driver_unregister(struct sa1111_driver *driver)
1369 {
1370         driver_unregister(&driver->drv);
1371 }
1372 EXPORT_SYMBOL(sa1111_driver_unregister);
1373 
1374 #ifdef CONFIG_DMABOUNCE
1375 /*
1376  * According to the "Intel StrongARM SA-1111 Microprocessor Companion
1377  * Chip Specification Update" (June 2000), erratum #7, there is a
1378  * significant bug in the SA1111 SDRAM shared memory controller.  If
1379  * an access to a region of memory above 1MB relative to the bank base,
1380  * it is important that address bit 10 _NOT_ be asserted. Depending
1381  * on the configuration of the RAM, bit 10 may correspond to one
1382  * of several different (processor-relative) address bits.
1383  *
1384  * This routine only identifies whether or not a given DMA address
1385  * is susceptible to the bug.
1386  *
1387  * This should only get called for sa1111_device types due to the
1388  * way we configure our device dma_masks.
1389  */
1390 static int sa1111_needs_bounce(struct device *dev, dma_addr_t addr, size_t size)
1391 {
1392         /*
1393          * Section 4.6 of the "Intel StrongARM SA-1111 Development Module
1394          * User's Guide" mentions that jumpers R51 and R52 control the
1395          * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or
1396          * SDRAM bank 1 on Neponset). The default configuration selects
1397          * Assabet, so any address in bank 1 is necessarily invalid.
1398          */
1399         return (machine_is_assabet() || machine_is_pfs168()) &&
1400                 (addr >= 0xc8000000 || (addr + size) >= 0xc8000000);
1401 }
1402 
1403 static int sa1111_notifier_call(struct notifier_block *n, unsigned long action,
1404         void *data)
1405 {
1406         struct sa1111_dev *dev = SA1111_DEV(data);
1407 
1408         switch (action) {
1409         case BUS_NOTIFY_ADD_DEVICE:
1410                 if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL) {
1411                         int ret = dmabounce_register_dev(&dev->dev, 1024, 4096,
1412                                         sa1111_needs_bounce);
1413                         if (ret)
1414                                 dev_err(&dev->dev, "failed to register with dmabounce: %d\n", ret);
1415                 }
1416                 break;
1417 
1418         case BUS_NOTIFY_DEL_DEVICE:
1419                 if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL)
1420                         dmabounce_unregister_dev(&dev->dev);
1421                 break;
1422         }
1423         return NOTIFY_OK;
1424 }
1425 
1426 static struct notifier_block sa1111_bus_notifier = {
1427         .notifier_call = sa1111_notifier_call,
1428 };
1429 #endif
1430 
1431 static int __init sa1111_init(void)
1432 {
1433         int ret = bus_register(&sa1111_bus_type);
1434 #ifdef CONFIG_DMABOUNCE
1435         if (ret == 0)
1436                 bus_register_notifier(&sa1111_bus_type, &sa1111_bus_notifier);
1437 #endif
1438         if (ret == 0)
1439                 platform_driver_register(&sa1111_device_driver);
1440         return ret;
1441 }
1442 
1443 static void __exit sa1111_exit(void)
1444 {
1445         platform_driver_unregister(&sa1111_device_driver);
1446 #ifdef CONFIG_DMABOUNCE
1447         bus_unregister_notifier(&sa1111_bus_type, &sa1111_bus_notifier);
1448 #endif
1449         bus_unregister(&sa1111_bus_type);
1450 }
1451 
1452 subsys_initcall(sa1111_init);
1453 module_exit(sa1111_exit);
1454 
1455 MODULE_DESCRIPTION("Intel Corporation SA1111 core driver");
1456 MODULE_LICENSE("GPL");
1457 

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