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1a48e157 TL |
1 | /* |
2 | * linux/arch/arm/mach-omap2/gpmc-smc91x.c | |
3 | * | |
4 | * Copyright (C) 2009 Nokia Corporation | |
5 | * Contact: Tony Lindgren | |
6 | * | |
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. | |
10 | */ | |
11 | ||
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> | |
17 | #include <linux/io.h> | |
18 | #include <linux/smc91x.h> | |
19 | ||
3ef5d007 | 20 | #include "gpmc.h" |
60628152 | 21 | #include "gpmc-smc91x.h" |
1a48e157 | 22 | |
dbc04161 TL |
23 | #include "soc.h" |
24 | ||
1a48e157 TL |
25 | static struct omap_smc91x_platform_data *gpmc_cfg; |
26 | ||
27 | static struct resource gpmc_smc91x_resources[] = { | |
28 | [0] = { | |
29 | .flags = IORESOURCE_MEM, | |
30 | }, | |
31 | [1] = { | |
32 | .flags = IORESOURCE_IRQ, | |
33 | }, | |
34 | }; | |
35 | ||
36 | static struct smc91x_platdata gpmc_smc91x_info = { | |
3bc48014 LM |
37 | .flags = SMC91X_USE_16BIT | SMC91X_NOWAIT | SMC91X_IO_SHIFT_0, |
38 | .leda = RPC_LED_100_10, | |
39 | .ledb = RPC_LED_TX_RX, | |
1a48e157 TL |
40 | }; |
41 | ||
42 | static struct platform_device gpmc_smc91x_device = { | |
43 | .name = "smc91x", | |
44 | .id = -1, | |
1a48e157 TL |
45 | .dev = { |
46 | .platform_data = &gpmc_smc91x_info, | |
47 | }, | |
3bc48014 LM |
48 | .num_resources = ARRAY_SIZE(gpmc_smc91x_resources), |
49 | .resource = gpmc_smc91x_resources, | |
1a48e157 TL |
50 | }; |
51 | ||
1119f3c3 JH |
52 | static struct gpmc_settings smc91x_settings = { |
53 | .device_width = GPMC_DEVWIDTH_16BIT, | |
54 | }; | |
55 | ||
1a48e157 TL |
56 | /* |
57 | * Set the gpmc timings for smc91c96. The timings are taken | |
58 | * from the data sheet available at: | |
59 | * http://www.smsc.com/main/catalog/lan91c96.html | |
60 | * REVISIT: Level shifters can add at least to the access latency. | |
61 | */ | |
62 | static int smc91c96_gpmc_retime(void) | |
63 | { | |
64 | struct gpmc_timings t; | |
ac2d9ae1 | 65 | struct gpmc_device_timings dev_t; |
1a48e157 TL |
66 | const int t3 = 10; /* Figure 12.2 read and 12.4 write */ |
67 | const int t4_r = 20; /* Figure 12.2 read */ | |
68 | const int t4_w = 5; /* Figure 12.4 write */ | |
69 | const int t5 = 25; /* Figure 12.2 read */ | |
70 | const int t6 = 15; /* Figure 12.2 read */ | |
71 | const int t7 = 5; /* Figure 12.4 write */ | |
72 | const int t8 = 5; /* Figure 12.4 write */ | |
73 | const int t20 = 185; /* Figure 12.2 read and 12.4 write */ | |
1a48e157 TL |
74 | |
75 | /* | |
76 | * FIXME: Calculate the address and data bus muxed timings. | |
77 | * Note that at least adv_rd_off needs to be changed according | |
78 | * to omap3430 TRM Figure 11-11. Are the sdp boards using the | |
79 | * FPGA in between smc91x and omap as the timings are different | |
80 | * from above? | |
81 | */ | |
82 | if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA) | |
83 | return 0; | |
84 | ||
ac2d9ae1 AM |
85 | memset(&dev_t, 0, sizeof(dev_t)); |
86 | ||
87 | dev_t.t_oeasu = t3 * 1000; | |
88 | dev_t.t_oe = t5 * 1000; | |
89 | dev_t.t_cez_r = t4_r * 1000; | |
90 | dev_t.t_oez = t6 * 1000; | |
91 | dev_t.t_rd_cycle = (t20 - t3) * 1000; | |
92 | ||
93 | dev_t.t_weasu = t3 * 1000; | |
94 | dev_t.t_wpl = t7 * 1000; | |
95 | dev_t.t_wph = t8 * 1000; | |
96 | dev_t.t_cez_w = t4_w * 1000; | |
97 | dev_t.t_wr_cycle = (t20 - t3) * 1000; | |
98 | ||
1119f3c3 | 99 | gpmc_calc_timings(&t, &smc91x_settings, &dev_t); |
ac2d9ae1 | 100 | |
1a48e157 TL |
101 | return gpmc_cs_set_timings(gpmc_cfg->cs, &t); |
102 | } | |
103 | ||
104 | /* | |
105 | * Initialize smc91x device connected to the GPMC. Note that we | |
106 | * assume that pin multiplexing is done in the board-*.c file, | |
107 | * or in the bootloader. | |
108 | */ | |
109 | void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data) | |
110 | { | |
111 | unsigned long cs_mem_base; | |
112 | int ret; | |
113 | ||
114 | gpmc_cfg = board_data; | |
115 | ||
116 | if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96) | |
117 | gpmc_cfg->retime = smc91c96_gpmc_retime; | |
118 | ||
119 | if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) { | |
120 | printk(KERN_ERR "Failed to request GPMC mem for smc91x\n"); | |
121 | return; | |
122 | } | |
123 | ||
124 | gpmc_smc91x_resources[0].start = cs_mem_base + 0x300; | |
125 | gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f; | |
126 | gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK); | |
127 | ||
1119f3c3 JH |
128 | if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA) |
129 | smc91x_settings.mux_add_data = GPMC_MUX_AD; | |
130 | if (gpmc_cfg->flags & GPMC_READ_MON) | |
131 | smc91x_settings.wait_on_read = true; | |
132 | if (gpmc_cfg->flags & GPMC_WRITE_MON) | |
133 | smc91x_settings.wait_on_write = true; | |
134 | if (gpmc_cfg->wait_pin) | |
135 | smc91x_settings.wait_pin = gpmc_cfg->wait_pin; | |
136 | ret = gpmc_cs_program_settings(gpmc_cfg->cs, &smc91x_settings); | |
137 | if (ret < 0) | |
138 | goto free1; | |
139 | ||
1a48e157 TL |
140 | if (gpmc_cfg->retime) { |
141 | ret = gpmc_cfg->retime(); | |
142 | if (ret != 0) | |
143 | goto free1; | |
144 | } | |
145 | ||
bc593f5d | 146 | if (gpio_request_one(gpmc_cfg->gpio_irq, GPIOF_IN, "SMC91X irq") < 0) |
1a48e157 TL |
147 | goto free1; |
148 | ||
1a48e157 TL |
149 | gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq); |
150 | ||
151 | if (gpmc_cfg->gpio_pwrdwn) { | |
bc593f5d IG |
152 | ret = gpio_request_one(gpmc_cfg->gpio_pwrdwn, |
153 | GPIOF_OUT_INIT_LOW, "SMC91X powerdown"); | |
1a48e157 TL |
154 | if (ret) |
155 | goto free2; | |
1a48e157 TL |
156 | } |
157 | ||
158 | if (gpmc_cfg->gpio_reset) { | |
bc593f5d IG |
159 | ret = gpio_request_one(gpmc_cfg->gpio_reset, |
160 | GPIOF_OUT_INIT_LOW, "SMC91X reset"); | |
1a48e157 TL |
161 | if (ret) |
162 | goto free3; | |
163 | ||
1a48e157 TL |
164 | gpio_set_value(gpmc_cfg->gpio_reset, 1); |
165 | msleep(100); | |
166 | gpio_set_value(gpmc_cfg->gpio_reset, 0); | |
167 | } | |
168 | ||
169 | if (platform_device_register(&gpmc_smc91x_device) < 0) { | |
170 | printk(KERN_ERR "Unable to register smc91x device\n"); | |
171 | gpio_free(gpmc_cfg->gpio_reset); | |
172 | goto free3; | |
173 | } | |
174 | ||
175 | return; | |
176 | ||
177 | free3: | |
178 | if (gpmc_cfg->gpio_pwrdwn) | |
179 | gpio_free(gpmc_cfg->gpio_pwrdwn); | |
180 | free2: | |
181 | gpio_free(gpmc_cfg->gpio_irq); | |
182 | free1: | |
183 | gpmc_cs_free(gpmc_cfg->cs); | |
184 | ||
185 | printk(KERN_ERR "Could not initialize smc91x\n"); | |
186 | } |