2 * linux/arch/arm/mach-omap2/gpmc-smc91x.c
4 * Copyright (C) 2009 Nokia Corporation
5 * Contact: Tony Lindgren
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/platform_device.h>
14 #include <linux/gpio.h>
15 #include <linux/delay.h>
16 #include <linux/interrupt.h>
18 #include <linux/smc91x.h>
21 #include "gpmc-smc91x.h"
25 static struct omap_smc91x_platform_data
*gpmc_cfg
;
27 static struct resource gpmc_smc91x_resources
[] = {
29 .flags
= IORESOURCE_MEM
,
32 .flags
= IORESOURCE_IRQ
,
36 static struct smc91x_platdata gpmc_smc91x_info
= {
37 .flags
= SMC91X_USE_16BIT
| SMC91X_NOWAIT
| SMC91X_IO_SHIFT_0
,
38 .leda
= RPC_LED_100_10
,
39 .ledb
= RPC_LED_TX_RX
,
42 static struct platform_device gpmc_smc91x_device
= {
46 .platform_data
= &gpmc_smc91x_info
,
48 .num_resources
= ARRAY_SIZE(gpmc_smc91x_resources
),
49 .resource
= gpmc_smc91x_resources
,
53 * Set the gpmc timings for smc91c96. The timings are taken
54 * from the data sheet available at:
55 * http://www.smsc.com/main/catalog/lan91c96.html
56 * REVISIT: Level shifters can add at least to the access latency.
58 static int smc91c96_gpmc_retime(void)
60 struct gpmc_timings t
;
61 struct gpmc_device_timings dev_t
;
62 const int t3
= 10; /* Figure 12.2 read and 12.4 write */
63 const int t4_r
= 20; /* Figure 12.2 read */
64 const int t4_w
= 5; /* Figure 12.4 write */
65 const int t5
= 25; /* Figure 12.2 read */
66 const int t6
= 15; /* Figure 12.2 read */
67 const int t7
= 5; /* Figure 12.4 write */
68 const int t8
= 5; /* Figure 12.4 write */
69 const int t20
= 185; /* Figure 12.2 read and 12.4 write */
72 l
= GPMC_CONFIG1_DEVICESIZE_16
;
73 if (gpmc_cfg
->flags
& GPMC_MUX_ADD_DATA
)
74 l
|= GPMC_CONFIG1_MUXADDDATA
;
75 if (gpmc_cfg
->flags
& GPMC_READ_MON
)
76 l
|= GPMC_CONFIG1_WAIT_READ_MON
;
77 if (gpmc_cfg
->flags
& GPMC_WRITE_MON
)
78 l
|= GPMC_CONFIG1_WAIT_WRITE_MON
;
79 if (gpmc_cfg
->wait_pin
)
80 l
|= GPMC_CONFIG1_WAIT_PIN_SEL(gpmc_cfg
->wait_pin
);
81 gpmc_cs_write_reg(gpmc_cfg
->cs
, GPMC_CS_CONFIG1
, l
);
84 * FIXME: Calculate the address and data bus muxed timings.
85 * Note that at least adv_rd_off needs to be changed according
86 * to omap3430 TRM Figure 11-11. Are the sdp boards using the
87 * FPGA in between smc91x and omap as the timings are different
90 if (gpmc_cfg
->flags
& GPMC_MUX_ADD_DATA
)
93 memset(&dev_t
, 0, sizeof(dev_t
));
95 dev_t
.t_oeasu
= t3
* 1000;
96 dev_t
.t_oe
= t5
* 1000;
97 dev_t
.t_cez_r
= t4_r
* 1000;
98 dev_t
.t_oez
= t6
* 1000;
99 dev_t
.t_rd_cycle
= (t20
- t3
) * 1000;
101 dev_t
.t_weasu
= t3
* 1000;
102 dev_t
.t_wpl
= t7
* 1000;
103 dev_t
.t_wph
= t8
* 1000;
104 dev_t
.t_cez_w
= t4_w
* 1000;
105 dev_t
.t_wr_cycle
= (t20
- t3
) * 1000;
107 gpmc_calc_timings(&t
, &dev_t
);
109 return gpmc_cs_set_timings(gpmc_cfg
->cs
, &t
);
113 * Initialize smc91x device connected to the GPMC. Note that we
114 * assume that pin multiplexing is done in the board-*.c file,
115 * or in the bootloader.
117 void __init
gpmc_smc91x_init(struct omap_smc91x_platform_data
*board_data
)
119 unsigned long cs_mem_base
;
122 gpmc_cfg
= board_data
;
124 if (gpmc_cfg
->flags
& GPMC_TIMINGS_SMC91C96
)
125 gpmc_cfg
->retime
= smc91c96_gpmc_retime
;
127 if (gpmc_cs_request(gpmc_cfg
->cs
, SZ_16M
, &cs_mem_base
) < 0) {
128 printk(KERN_ERR
"Failed to request GPMC mem for smc91x\n");
132 gpmc_smc91x_resources
[0].start
= cs_mem_base
+ 0x300;
133 gpmc_smc91x_resources
[0].end
= cs_mem_base
+ 0x30f;
134 gpmc_smc91x_resources
[1].flags
|= (gpmc_cfg
->flags
& IRQF_TRIGGER_MASK
);
136 if (gpmc_cfg
->retime
) {
137 ret
= gpmc_cfg
->retime();
142 if (gpio_request_one(gpmc_cfg
->gpio_irq
, GPIOF_IN
, "SMC91X irq") < 0)
145 gpmc_smc91x_resources
[1].start
= gpio_to_irq(gpmc_cfg
->gpio_irq
);
147 if (gpmc_cfg
->gpio_pwrdwn
) {
148 ret
= gpio_request_one(gpmc_cfg
->gpio_pwrdwn
,
149 GPIOF_OUT_INIT_LOW
, "SMC91X powerdown");
154 if (gpmc_cfg
->gpio_reset
) {
155 ret
= gpio_request_one(gpmc_cfg
->gpio_reset
,
156 GPIOF_OUT_INIT_LOW
, "SMC91X reset");
160 gpio_set_value(gpmc_cfg
->gpio_reset
, 1);
162 gpio_set_value(gpmc_cfg
->gpio_reset
, 0);
165 if (platform_device_register(&gpmc_smc91x_device
) < 0) {
166 printk(KERN_ERR
"Unable to register smc91x device\n");
167 gpio_free(gpmc_cfg
->gpio_reset
);
174 if (gpmc_cfg
->gpio_pwrdwn
)
175 gpio_free(gpmc_cfg
->gpio_pwrdwn
);
177 gpio_free(gpmc_cfg
->gpio_irq
);
179 gpmc_cs_free(gpmc_cfg
->cs
);
181 printk(KERN_ERR
"Could not initialize smc91x\n");