2 * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright (C) 2010 Jason Wang <jason77.wang@gmail.com>
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
16 #include <linux/platform_device.h>
17 #include <linux/gpio.h>
18 #include <linux/smsc911x.h>
20 #include <mach/hardware.h>
22 /* LAN9217 ethernet base address */
23 #define LAN9217_BASE_ADDR(n) (n + 0x0)
25 #define UARTA_BASE_ADDR(n) (n + 0x8000)
26 #define UARTB_BASE_ADDR(n) (n + 0x10000)
28 #define BOARD_IO_ADDR(n) (n + 0x20000)
30 #define LED_SWITCH_REG 0x00
32 #define SWITCH_BUTTONS_REG 0x08
33 /* status, interrupt */
34 #define INTR_STATUS_REG 0x10
35 #define INTR_MASK_REG 0x38
36 #define INTR_RESET_REG 0x20
37 /* magic word for debug CPLD */
38 #define MAGIC_NUMBER1_REG 0x40
39 #define MAGIC_NUMBER2_REG 0x48
40 /* CPLD code version */
41 #define CPLD_CODE_VER_REG 0x50
42 /* magic word for debug CPLD */
43 #define MAGIC_NUMBER3_REG 0x58
44 /* module reset register*/
45 #define MODULE_RESET_REG 0x60
46 /* CPU ID and Personality ID */
47 #define MCU_BOARD_ID_REG 0x68
49 #define MXC_IRQ_TO_EXPIO(irq) ((irq) - MXC_BOARD_IRQ_START)
50 #define MXC_IRQ_TO_GPIO(irq) ((irq) - MXC_INTERNAL_IRQS)
52 #define MXC_EXP_IO_BASE (MXC_BOARD_IRQ_START)
53 #define MXC_MAX_EXP_IO_LINES 16
55 /* interrupts like external uart , external ethernet etc*/
56 #define EXPIO_INT_ENET (MXC_BOARD_IRQ_START + 0)
57 #define EXPIO_INT_XUART_A (MXC_BOARD_IRQ_START + 1)
58 #define EXPIO_INT_XUART_B (MXC_BOARD_IRQ_START + 2)
59 #define EXPIO_INT_BUTTON_A (MXC_BOARD_IRQ_START + 3)
60 #define EXPIO_INT_BUTTON_B (MXC_BOARD_IRQ_START + 4)
62 static void __iomem
*brd_io
;
64 static struct resource smsc911x_resources
[] = {
66 .flags
= IORESOURCE_MEM
,
68 .start
= EXPIO_INT_ENET
,
69 .end
= EXPIO_INT_ENET
,
70 .flags
= IORESOURCE_IRQ
,
74 static struct smsc911x_platform_config smsc911x_config
= {
75 .irq_polarity
= SMSC911X_IRQ_POLARITY_ACTIVE_LOW
,
76 .flags
= SMSC911X_USE_32BIT
| SMSC911X_FORCE_INTERNAL_PHY
,
79 static struct platform_device smsc_lan9217_device
= {
83 .platform_data
= &smsc911x_config
,
85 .num_resources
= ARRAY_SIZE(smsc911x_resources
),
86 .resource
= smsc911x_resources
,
89 static void mxc_expio_irq_handler(u32 irq
, struct irq_desc
*desc
)
95 /* irq = gpio irq number */
96 desc
->irq_data
.chip
->irq_mask(&desc
->irq_data
);
98 imr_val
= __raw_readw(brd_io
+ INTR_MASK_REG
);
99 int_valid
= __raw_readw(brd_io
+ INTR_STATUS_REG
) & ~imr_val
;
101 expio_irq
= MXC_BOARD_IRQ_START
;
102 for (; int_valid
!= 0; int_valid
>>= 1, expio_irq
++) {
103 if ((int_valid
& 1) == 0)
105 generic_handle_irq(expio_irq
);
108 desc
->irq_data
.chip
->irq_ack(&desc
->irq_data
);
109 desc
->irq_data
.chip
->irq_unmask(&desc
->irq_data
);
113 * Disable an expio pin's interrupt by setting the bit in the imr.
114 * Irq is an expio virtual irq number
116 static void expio_mask_irq(struct irq_data
*d
)
119 u32 expio
= MXC_IRQ_TO_EXPIO(d
->irq
);
121 reg
= __raw_readw(brd_io
+ INTR_MASK_REG
);
123 __raw_writew(reg
, brd_io
+ INTR_MASK_REG
);
126 static void expio_ack_irq(struct irq_data
*d
)
128 u32 expio
= MXC_IRQ_TO_EXPIO(d
->irq
);
130 __raw_writew(1 << expio
, brd_io
+ INTR_RESET_REG
);
131 __raw_writew(0, brd_io
+ INTR_RESET_REG
);
135 static void expio_unmask_irq(struct irq_data
*d
)
138 u32 expio
= MXC_IRQ_TO_EXPIO(d
->irq
);
140 reg
= __raw_readw(brd_io
+ INTR_MASK_REG
);
141 reg
&= ~(1 << expio
);
142 __raw_writew(reg
, brd_io
+ INTR_MASK_REG
);
145 static struct irq_chip expio_irq_chip
= {
146 .irq_ack
= expio_ack_irq
,
147 .irq_mask
= expio_mask_irq
,
148 .irq_unmask
= expio_unmask_irq
,
151 int __init
mxc_expio_init(u32 base
, u32 p_irq
)
155 brd_io
= ioremap(BOARD_IO_ADDR(base
), SZ_4K
);
159 if ((__raw_readw(brd_io
+ MAGIC_NUMBER1_REG
) != 0xAAAA) ||
160 (__raw_readw(brd_io
+ MAGIC_NUMBER2_REG
) != 0x5555) ||
161 (__raw_readw(brd_io
+ MAGIC_NUMBER3_REG
) != 0xCAFE)) {
162 pr_info("3-Stack Debug board not detected\n");
168 pr_info("3-Stack Debug board detected, rev = 0x%04X\n",
169 readw(brd_io
+ CPLD_CODE_VER_REG
));
172 * Configure INT line as GPIO input
174 gpio_request(MXC_IRQ_TO_GPIO(p_irq
), "expio_pirq");
175 gpio_direction_input(MXC_IRQ_TO_GPIO(p_irq
));
177 /* disable the interrupt and clear the status */
178 __raw_writew(0, brd_io
+ INTR_MASK_REG
);
179 __raw_writew(0xFFFF, brd_io
+ INTR_RESET_REG
);
180 __raw_writew(0, brd_io
+ INTR_RESET_REG
);
181 __raw_writew(0x1F, brd_io
+ INTR_MASK_REG
);
182 for (i
= MXC_EXP_IO_BASE
;
183 i
< (MXC_EXP_IO_BASE
+ MXC_MAX_EXP_IO_LINES
); i
++) {
184 irq_set_chip_and_handler(i
, &expio_irq_chip
, handle_level_irq
);
185 set_irq_flags(i
, IRQF_VALID
);
187 irq_set_irq_type(p_irq
, IRQF_TRIGGER_LOW
);
188 irq_set_chained_handler(p_irq
, mxc_expio_irq_handler
);
190 /* Register Lan device on the debugboard */
191 smsc911x_resources
[0].start
= LAN9217_BASE_ADDR(base
);
192 smsc911x_resources
[0].end
= LAN9217_BASE_ADDR(base
) + 0x100 - 1;
193 platform_device_register(&smsc_lan9217_device
);