2 * arch/arm/mach-ep93xx/core.c
3 * Core routines for Cirrus EP93xx chips.
5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
6 * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
8 * Thanks go to Michael Burian and Ray Lehtiniemi for their key
9 * role in the ep93xx linux community.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/spinlock.h>
20 #include <linux/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/serial.h>
23 #include <linux/tty.h>
24 #include <linux/bitops.h>
25 #include <linux/serial_8250.h>
26 #include <linux/serial_core.h>
27 #include <linux/device.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/time.h>
31 #include <linux/timex.h>
32 #include <linux/delay.h>
33 #include <linux/termios.h>
34 #include <linux/amba/bus.h>
35 #include <linux/amba/serial.h>
37 #include <linux/i2c.h>
38 #include <linux/i2c-gpio.h>
40 #include <asm/types.h>
41 #include <asm/setup.h>
42 #include <asm/memory.h>
43 #include <mach/hardware.h>
45 #include <asm/system.h>
46 #include <asm/tlbflush.h>
47 #include <asm/pgtable.h>
49 #include <asm/mach/map.h>
50 #include <asm/mach/time.h>
51 #include <asm/mach/irq.h>
52 #include <mach/gpio.h>
54 #include <asm/hardware/vic.h>
57 /*************************************************************************
58 * Static I/O mappings that are needed for all EP93xx platforms
59 *************************************************************************/
60 static struct map_desc ep93xx_io_desc
[] __initdata
= {
62 .virtual = EP93XX_AHB_VIRT_BASE
,
63 .pfn
= __phys_to_pfn(EP93XX_AHB_PHYS_BASE
),
64 .length
= EP93XX_AHB_SIZE
,
67 .virtual = EP93XX_APB_VIRT_BASE
,
68 .pfn
= __phys_to_pfn(EP93XX_APB_PHYS_BASE
),
69 .length
= EP93XX_APB_SIZE
,
74 void __init
ep93xx_map_io(void)
76 iotable_init(ep93xx_io_desc
, ARRAY_SIZE(ep93xx_io_desc
));
80 /*************************************************************************
81 * Timer handling for EP93xx
82 *************************************************************************
83 * The ep93xx has four internal timers. Timers 1, 2 (both 16 bit) and
84 * 3 (32 bit) count down at 508 kHz, are self-reloading, and can generate
85 * an interrupt on underflow. Timer 4 (40 bit) counts down at 983.04 kHz,
86 * is free-running, and can't generate interrupts.
88 * The 508 kHz timers are ideal for use for the timer interrupt, as the
89 * most common values of HZ divide 508 kHz nicely. We pick one of the 16
90 * bit timers (timer 1) since we don't need more than 16 bits of reload
91 * value as long as HZ >= 8.
93 * The higher clock rate of timer 4 makes it a better choice than the
94 * other timers for use in gettimeoffset(), while the fact that it can't
95 * generate interrupts means we don't have to worry about not being able
96 * to use this timer for something else. We also use timer 4 for keeping
97 * track of lost jiffies.
99 static unsigned int last_jiffy_time
;
101 #define TIMER4_TICKS_PER_JIFFY ((CLOCK_TICK_RATE + (HZ/2)) / HZ)
103 static irqreturn_t
ep93xx_timer_interrupt(int irq
, void *dev_id
)
105 __raw_writel(1, EP93XX_TIMER1_CLEAR
);
107 (__raw_readl(EP93XX_TIMER4_VALUE_LOW
) - last_jiffy_time
)
108 >= TIMER4_TICKS_PER_JIFFY
) {
109 last_jiffy_time
+= TIMER4_TICKS_PER_JIFFY
;
116 static struct irqaction ep93xx_timer_irq
= {
117 .name
= "ep93xx timer",
118 .flags
= IRQF_DISABLED
| IRQF_TIMER
| IRQF_IRQPOLL
,
119 .handler
= ep93xx_timer_interrupt
,
122 static void __init
ep93xx_timer_init(void)
124 /* Enable periodic HZ timer. */
125 __raw_writel(0x48, EP93XX_TIMER1_CONTROL
);
126 __raw_writel((508469 / HZ
) - 1, EP93XX_TIMER1_LOAD
);
127 __raw_writel(0xc8, EP93XX_TIMER1_CONTROL
);
129 /* Enable lost jiffy timer. */
130 __raw_writel(0x100, EP93XX_TIMER4_VALUE_HIGH
);
132 setup_irq(IRQ_EP93XX_TIMER1
, &ep93xx_timer_irq
);
135 static unsigned long ep93xx_gettimeoffset(void)
139 offset
= __raw_readl(EP93XX_TIMER4_VALUE_LOW
) - last_jiffy_time
;
141 /* Calculate (1000000 / 983040) * offset. */
142 return offset
+ (53 * offset
/ 3072);
145 struct sys_timer ep93xx_timer
= {
146 .init
= ep93xx_timer_init
,
147 .offset
= ep93xx_gettimeoffset
,
151 /*************************************************************************
152 * GPIO handling for EP93xx
153 *************************************************************************/
154 static unsigned char gpio_int_unmasked
[3];
155 static unsigned char gpio_int_enabled
[3];
156 static unsigned char gpio_int_type1
[3];
157 static unsigned char gpio_int_type2
[3];
158 static unsigned char gpio_int_debounce
[3];
160 /* Port ordering is: A B F */
161 static const u8 int_type1_register_offset
[3] = { 0x90, 0xac, 0x4c };
162 static const u8 int_type2_register_offset
[3] = { 0x94, 0xb0, 0x50 };
163 static const u8 eoi_register_offset
[3] = { 0x98, 0xb4, 0x54 };
164 static const u8 int_en_register_offset
[3] = { 0x9c, 0xb8, 0x58 };
165 static const u8 int_debounce_register_offset
[3] = { 0xa8, 0xc4, 0x64 };
167 void ep93xx_gpio_update_int_params(unsigned port
)
171 __raw_writeb(0, EP93XX_GPIO_REG(int_en_register_offset
[port
]));
173 __raw_writeb(gpio_int_type2
[port
],
174 EP93XX_GPIO_REG(int_type2_register_offset
[port
]));
176 __raw_writeb(gpio_int_type1
[port
],
177 EP93XX_GPIO_REG(int_type1_register_offset
[port
]));
179 __raw_writeb(gpio_int_unmasked
[port
] & gpio_int_enabled
[port
],
180 EP93XX_GPIO_REG(int_en_register_offset
[port
]));
183 void ep93xx_gpio_int_mask(unsigned line
)
185 gpio_int_unmasked
[line
>> 3] &= ~(1 << (line
& 7));
188 void ep93xx_gpio_int_debounce(unsigned int irq
, int enable
)
190 int line
= irq_to_gpio(irq
);
191 int port
= line
>> 3;
192 int port_mask
= 1 << (line
& 7);
195 gpio_int_debounce
[port
] |= port_mask
;
197 gpio_int_debounce
[port
] &= ~port_mask
;
199 __raw_writeb(gpio_int_debounce
[port
],
200 EP93XX_GPIO_REG(int_debounce_register_offset
[port
]));
202 EXPORT_SYMBOL(ep93xx_gpio_int_debounce
);
204 /*************************************************************************
205 * EP93xx IRQ handling
206 *************************************************************************/
207 static void ep93xx_gpio_ab_irq_handler(unsigned int irq
, struct irq_desc
*desc
)
209 unsigned char status
;
212 status
= __raw_readb(EP93XX_GPIO_A_INT_STATUS
);
213 for (i
= 0; i
< 8; i
++) {
214 if (status
& (1 << i
)) {
215 int gpio_irq
= gpio_to_irq(EP93XX_GPIO_LINE_A(0)) + i
;
216 generic_handle_irq(gpio_irq
);
220 status
= __raw_readb(EP93XX_GPIO_B_INT_STATUS
);
221 for (i
= 0; i
< 8; i
++) {
222 if (status
& (1 << i
)) {
223 int gpio_irq
= gpio_to_irq(EP93XX_GPIO_LINE_B(0)) + i
;
224 desc
= irq_desc
+ gpio_irq
;
225 generic_handle_irq(gpio_irq
);
230 static void ep93xx_gpio_f_irq_handler(unsigned int irq
, struct irq_desc
*desc
)
233 * map discontiguous hw irq range to continous sw irq range:
235 * IRQ_EP93XX_GPIO{0..7}MUX -> gpio_to_irq(EP93XX_GPIO_LINE_F({0..7})
237 int port_f_idx
= ((irq
+ 1) & 7) ^ 4; /* {19..22,47..50} -> {0..7} */
238 int gpio_irq
= gpio_to_irq(EP93XX_GPIO_LINE_F(0)) + port_f_idx
;
240 generic_handle_irq(gpio_irq
);
243 static void ep93xx_gpio_irq_ack(unsigned int irq
)
245 int line
= irq_to_gpio(irq
);
246 int port
= line
>> 3;
247 int port_mask
= 1 << (line
& 7);
249 if ((irq_desc
[irq
].status
& IRQ_TYPE_SENSE_MASK
) == IRQ_TYPE_EDGE_BOTH
) {
250 gpio_int_type2
[port
] ^= port_mask
; /* switch edge direction */
251 ep93xx_gpio_update_int_params(port
);
254 __raw_writeb(port_mask
, EP93XX_GPIO_REG(eoi_register_offset
[port
]));
257 static void ep93xx_gpio_irq_mask_ack(unsigned int irq
)
259 int line
= irq_to_gpio(irq
);
260 int port
= line
>> 3;
261 int port_mask
= 1 << (line
& 7);
263 if ((irq_desc
[irq
].status
& IRQ_TYPE_SENSE_MASK
) == IRQ_TYPE_EDGE_BOTH
)
264 gpio_int_type2
[port
] ^= port_mask
; /* switch edge direction */
266 gpio_int_unmasked
[port
] &= ~port_mask
;
267 ep93xx_gpio_update_int_params(port
);
269 __raw_writeb(port_mask
, EP93XX_GPIO_REG(eoi_register_offset
[port
]));
272 static void ep93xx_gpio_irq_mask(unsigned int irq
)
274 int line
= irq_to_gpio(irq
);
275 int port
= line
>> 3;
277 gpio_int_unmasked
[port
] &= ~(1 << (line
& 7));
278 ep93xx_gpio_update_int_params(port
);
281 static void ep93xx_gpio_irq_unmask(unsigned int irq
)
283 int line
= irq_to_gpio(irq
);
284 int port
= line
>> 3;
286 gpio_int_unmasked
[port
] |= 1 << (line
& 7);
287 ep93xx_gpio_update_int_params(port
);
292 * gpio_int_type1 controls whether the interrupt is level (0) or
293 * edge (1) triggered, while gpio_int_type2 controls whether it
294 * triggers on low/falling (0) or high/rising (1).
296 static int ep93xx_gpio_irq_type(unsigned int irq
, unsigned int type
)
298 struct irq_desc
*desc
= irq_desc
+ irq
;
299 const int gpio
= irq_to_gpio(irq
);
300 const int port
= gpio
>> 3;
301 const int port_mask
= 1 << (gpio
& 7);
303 gpio_direction_input(gpio
);
306 case IRQ_TYPE_EDGE_RISING
:
307 gpio_int_type1
[port
] |= port_mask
;
308 gpio_int_type2
[port
] |= port_mask
;
309 desc
->handle_irq
= handle_edge_irq
;
311 case IRQ_TYPE_EDGE_FALLING
:
312 gpio_int_type1
[port
] |= port_mask
;
313 gpio_int_type2
[port
] &= ~port_mask
;
314 desc
->handle_irq
= handle_edge_irq
;
316 case IRQ_TYPE_LEVEL_HIGH
:
317 gpio_int_type1
[port
] &= ~port_mask
;
318 gpio_int_type2
[port
] |= port_mask
;
319 desc
->handle_irq
= handle_level_irq
;
321 case IRQ_TYPE_LEVEL_LOW
:
322 gpio_int_type1
[port
] &= ~port_mask
;
323 gpio_int_type2
[port
] &= ~port_mask
;
324 desc
->handle_irq
= handle_level_irq
;
326 case IRQ_TYPE_EDGE_BOTH
:
327 gpio_int_type1
[port
] |= port_mask
;
328 /* set initial polarity based on current input level */
329 if (gpio_get_value(gpio
))
330 gpio_int_type2
[port
] &= ~port_mask
; /* falling */
332 gpio_int_type2
[port
] |= port_mask
; /* rising */
333 desc
->handle_irq
= handle_edge_irq
;
336 pr_err("ep93xx: failed to set irq type %d for gpio %d\n",
341 gpio_int_enabled
[port
] |= port_mask
;
343 desc
->status
&= ~IRQ_TYPE_SENSE_MASK
;
344 desc
->status
|= type
& IRQ_TYPE_SENSE_MASK
;
346 ep93xx_gpio_update_int_params(port
);
351 static struct irq_chip ep93xx_gpio_irq_chip
= {
353 .ack
= ep93xx_gpio_irq_ack
,
354 .mask_ack
= ep93xx_gpio_irq_mask_ack
,
355 .mask
= ep93xx_gpio_irq_mask
,
356 .unmask
= ep93xx_gpio_irq_unmask
,
357 .set_type
= ep93xx_gpio_irq_type
,
361 void __init
ep93xx_init_irq(void)
365 vic_init((void *)EP93XX_VIC1_BASE
, 0, EP93XX_VIC1_VALID_IRQ_MASK
, 0);
366 vic_init((void *)EP93XX_VIC2_BASE
, 32, EP93XX_VIC2_VALID_IRQ_MASK
, 0);
368 for (gpio_irq
= gpio_to_irq(0);
369 gpio_irq
<= gpio_to_irq(EP93XX_GPIO_LINE_MAX_IRQ
); ++gpio_irq
) {
370 set_irq_chip(gpio_irq
, &ep93xx_gpio_irq_chip
);
371 set_irq_handler(gpio_irq
, handle_level_irq
);
372 set_irq_flags(gpio_irq
, IRQF_VALID
);
375 set_irq_chained_handler(IRQ_EP93XX_GPIO_AB
, ep93xx_gpio_ab_irq_handler
);
376 set_irq_chained_handler(IRQ_EP93XX_GPIO0MUX
, ep93xx_gpio_f_irq_handler
);
377 set_irq_chained_handler(IRQ_EP93XX_GPIO1MUX
, ep93xx_gpio_f_irq_handler
);
378 set_irq_chained_handler(IRQ_EP93XX_GPIO2MUX
, ep93xx_gpio_f_irq_handler
);
379 set_irq_chained_handler(IRQ_EP93XX_GPIO3MUX
, ep93xx_gpio_f_irq_handler
);
380 set_irq_chained_handler(IRQ_EP93XX_GPIO4MUX
, ep93xx_gpio_f_irq_handler
);
381 set_irq_chained_handler(IRQ_EP93XX_GPIO5MUX
, ep93xx_gpio_f_irq_handler
);
382 set_irq_chained_handler(IRQ_EP93XX_GPIO6MUX
, ep93xx_gpio_f_irq_handler
);
383 set_irq_chained_handler(IRQ_EP93XX_GPIO7MUX
, ep93xx_gpio_f_irq_handler
);
387 /*************************************************************************
388 * EP93xx System Controller Software Locked register handling
389 *************************************************************************/
392 * syscon_swlock prevents anything else from writing to the syscon
393 * block while a software locked register is being written.
395 static DEFINE_SPINLOCK(syscon_swlock
);
397 void ep93xx_syscon_swlocked_write(unsigned int val
, unsigned int reg
)
401 spin_lock_irqsave(&syscon_swlock
, flags
);
403 __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK
);
404 __raw_writel(val
, reg
);
406 spin_unlock_irqrestore(&syscon_swlock
, flags
);
408 EXPORT_SYMBOL(ep93xx_syscon_swlocked_write
);
410 void ep93xx_devcfg_set_clear(unsigned int set_bits
, unsigned int clear_bits
)
415 spin_lock_irqsave(&syscon_swlock
, flags
);
417 val
= __raw_readl(EP93XX_SYSCON_DEVCFG
);
420 __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK
);
421 __raw_writel(val
, EP93XX_SYSCON_DEVCFG
);
423 spin_unlock_irqrestore(&syscon_swlock
, flags
);
425 EXPORT_SYMBOL(ep93xx_devcfg_set_clear
);
428 /*************************************************************************
429 * EP93xx peripheral handling
430 *************************************************************************/
431 #define EP93XX_UART_MCR_OFFSET (0x0100)
433 static void ep93xx_uart_set_mctrl(struct amba_device
*dev
,
434 void __iomem
*base
, unsigned int mctrl
)
439 if (!(mctrl
& TIOCM_RTS
))
441 if (!(mctrl
& TIOCM_DTR
))
444 __raw_writel(mcr
, base
+ EP93XX_UART_MCR_OFFSET
);
447 static struct amba_pl010_data ep93xx_uart_data
= {
448 .set_mctrl
= ep93xx_uart_set_mctrl
,
451 static struct amba_device uart1_device
= {
453 .init_name
= "apb:uart1",
454 .platform_data
= &ep93xx_uart_data
,
457 .start
= EP93XX_UART1_PHYS_BASE
,
458 .end
= EP93XX_UART1_PHYS_BASE
+ 0x0fff,
459 .flags
= IORESOURCE_MEM
,
461 .irq
= { IRQ_EP93XX_UART1
, NO_IRQ
},
462 .periphid
= 0x00041010,
465 static struct amba_device uart2_device
= {
467 .init_name
= "apb:uart2",
468 .platform_data
= &ep93xx_uart_data
,
471 .start
= EP93XX_UART2_PHYS_BASE
,
472 .end
= EP93XX_UART2_PHYS_BASE
+ 0x0fff,
473 .flags
= IORESOURCE_MEM
,
475 .irq
= { IRQ_EP93XX_UART2
, NO_IRQ
},
476 .periphid
= 0x00041010,
479 static struct amba_device uart3_device
= {
481 .init_name
= "apb:uart3",
482 .platform_data
= &ep93xx_uart_data
,
485 .start
= EP93XX_UART3_PHYS_BASE
,
486 .end
= EP93XX_UART3_PHYS_BASE
+ 0x0fff,
487 .flags
= IORESOURCE_MEM
,
489 .irq
= { IRQ_EP93XX_UART3
, NO_IRQ
},
490 .periphid
= 0x00041010,
494 static struct resource ep93xx_rtc_resource
[] = {
496 .start
= EP93XX_RTC_PHYS_BASE
,
497 .end
= EP93XX_RTC_PHYS_BASE
+ 0x10c - 1,
498 .flags
= IORESOURCE_MEM
,
502 static struct platform_device ep93xx_rtc_device
= {
503 .name
= "ep93xx-rtc",
505 .num_resources
= ARRAY_SIZE(ep93xx_rtc_resource
),
506 .resource
= ep93xx_rtc_resource
,
510 static struct resource ep93xx_ohci_resources
[] = {
512 .start
= EP93XX_USB_PHYS_BASE
,
513 .end
= EP93XX_USB_PHYS_BASE
+ 0x0fff,
514 .flags
= IORESOURCE_MEM
,
517 .start
= IRQ_EP93XX_USB
,
518 .end
= IRQ_EP93XX_USB
,
519 .flags
= IORESOURCE_IRQ
,
524 static struct platform_device ep93xx_ohci_device
= {
525 .name
= "ep93xx-ohci",
528 .dma_mask
= &ep93xx_ohci_device
.dev
.coherent_dma_mask
,
529 .coherent_dma_mask
= DMA_BIT_MASK(32),
531 .num_resources
= ARRAY_SIZE(ep93xx_ohci_resources
),
532 .resource
= ep93xx_ohci_resources
,
535 static struct ep93xx_eth_data ep93xx_eth_data
;
537 static struct resource ep93xx_eth_resource
[] = {
539 .start
= EP93XX_ETHERNET_PHYS_BASE
,
540 .end
= EP93XX_ETHERNET_PHYS_BASE
+ 0xffff,
541 .flags
= IORESOURCE_MEM
,
543 .start
= IRQ_EP93XX_ETHERNET
,
544 .end
= IRQ_EP93XX_ETHERNET
,
545 .flags
= IORESOURCE_IRQ
,
549 static struct platform_device ep93xx_eth_device
= {
550 .name
= "ep93xx-eth",
553 .platform_data
= &ep93xx_eth_data
,
555 .num_resources
= ARRAY_SIZE(ep93xx_eth_resource
),
556 .resource
= ep93xx_eth_resource
,
559 void __init
ep93xx_register_eth(struct ep93xx_eth_data
*data
, int copy_addr
)
562 memcpy(data
->dev_addr
,
563 (void *)(EP93XX_ETHERNET_BASE
+ 0x50), 6);
566 ep93xx_eth_data
= *data
;
567 platform_device_register(&ep93xx_eth_device
);
570 static struct i2c_gpio_platform_data ep93xx_i2c_data
= {
571 .sda_pin
= EP93XX_GPIO_LINE_EEDAT
,
572 .sda_is_open_drain
= 0,
573 .scl_pin
= EP93XX_GPIO_LINE_EECLK
,
574 .scl_is_open_drain
= 0,
578 static struct platform_device ep93xx_i2c_device
= {
581 .dev
.platform_data
= &ep93xx_i2c_data
,
584 void __init
ep93xx_register_i2c(struct i2c_board_info
*devices
, int num
)
586 i2c_register_board_info(0, devices
, num
);
587 platform_device_register(&ep93xx_i2c_device
);
590 extern void ep93xx_gpio_init(void);
592 void __init
ep93xx_init_devices(void)
594 /* Disallow access to MaverickCrunch initially */
595 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA
);
599 amba_device_register(&uart1_device
, &iomem_resource
);
600 amba_device_register(&uart2_device
, &iomem_resource
);
601 amba_device_register(&uart3_device
, &iomem_resource
);
603 platform_device_register(&ep93xx_rtc_device
);
604 platform_device_register(&ep93xx_ohci_device
);