1 /*
2 * linux/arch/arm/mach-omap2/usb-tusb6010.c
3 *
4 * Copyright (C) 2006 Nokia Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/err.h>
12 #include <linux/string.h>
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/delay.h>
16 #include <linux/platform_device.h>
17 #include <linux/gpio.h>
18 #include <linux/export.h>
19 #include <linux/platform_data/usb-omap.h>
20
21 #include <linux/usb/musb.h>
22
23 #include "gpmc.h"
24
25 #include "mux.h"
26
27 static u8 async_cs, sync_cs;
28 static unsigned refclk_psec;
29
30 static struct gpmc_settings tusb_async = {
31 .wait_on_read = true,
32 .wait_on_write = true,
33 .device_width = GPMC_DEVWIDTH_16BIT,
34 .mux_add_data = GPMC_MUX_AD,
35 };
36
37 static struct gpmc_settings tusb_sync = {
38 .burst_read = true,
39 .burst_write = true,
40 .sync_read = true,
41 .sync_write = true,
42 .wait_on_read = true,
43 .wait_on_write = true,
44 .burst_len = GPMC_BURST_16,
45 .device_width = GPMC_DEVWIDTH_16BIT,
46 .mux_add_data = GPMC_MUX_AD,
47 };
48
49 /* NOTE: timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */
50
tusb_set_async_mode(unsigned sysclk_ps)51 static int tusb_set_async_mode(unsigned sysclk_ps)
52 {
53 struct gpmc_device_timings dev_t;
54 struct gpmc_timings t;
55 unsigned t_acsnh_advnh = sysclk_ps + 3000;
56
57 memset(&dev_t, 0, sizeof(dev_t));
58
59 dev_t.t_ceasu = 8 * 1000;
60 dev_t.t_avdasu = t_acsnh_advnh - 7000;
61 dev_t.t_ce_avd = 1000;
62 dev_t.t_avdp_r = t_acsnh_advnh;
63 dev_t.t_oeasu = t_acsnh_advnh + 1000;
64 dev_t.t_oe = 300;
65 dev_t.t_cez_r = 7000;
66 dev_t.t_cez_w = dev_t.t_cez_r;
67 dev_t.t_avdp_w = t_acsnh_advnh;
68 dev_t.t_weasu = t_acsnh_advnh + 1000;
69 dev_t.t_wpl = 300;
70 dev_t.cyc_aavdh_we = 1;
71
72 gpmc_calc_timings(&t, &tusb_async, &dev_t);
73
74 return gpmc_cs_set_timings(async_cs, &t, &tusb_async);
75 }
76
tusb_set_sync_mode(unsigned sysclk_ps)77 static int tusb_set_sync_mode(unsigned sysclk_ps)
78 {
79 struct gpmc_device_timings dev_t;
80 struct gpmc_timings t;
81 unsigned t_scsnh_advnh = sysclk_ps + 3000;
82
83 memset(&dev_t, 0, sizeof(dev_t));
84
85 dev_t.clk = 11100;
86 dev_t.t_bacc = 1000;
87 dev_t.t_ces = 1000;
88 dev_t.t_ceasu = 8 * 1000;
89 dev_t.t_avdasu = t_scsnh_advnh - 7000;
90 dev_t.t_ce_avd = 1000;
91 dev_t.t_avdp_r = t_scsnh_advnh;
92 dev_t.cyc_aavdh_oe = 3;
93 dev_t.cyc_oe = 5;
94 dev_t.t_ce_rdyz = 7000;
95 dev_t.t_avdp_w = t_scsnh_advnh;
96 dev_t.cyc_aavdh_we = 3;
97 dev_t.cyc_wpl = 6;
98
99 gpmc_calc_timings(&t, &tusb_sync, &dev_t);
100
101 return gpmc_cs_set_timings(sync_cs, &t, &tusb_sync);
102 }
103
104 /* tusb driver calls this when it changes the chip's clocking */
tusb6010_platform_retime(unsigned is_refclk)105 int tusb6010_platform_retime(unsigned is_refclk)
106 {
107 static const char error[] =
108 KERN_ERR "tusb6010 %s retime error %d\n";
109
110 unsigned sysclk_ps;
111 int status;
112
113 if (!refclk_psec)
114 return -ENODEV;
115
116 sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;
117
118 status = tusb_set_async_mode(sysclk_ps);
119 if (status < 0) {
120 printk(error, "async", status);
121 goto done;
122 }
123 status = tusb_set_sync_mode(sysclk_ps);
124 if (status < 0)
125 printk(error, "sync", status);
126 done:
127 return status;
128 }
129 EXPORT_SYMBOL_GPL(tusb6010_platform_retime);
130
131 static struct resource tusb_resources[] = {
132 /* Order is significant! The start/end fields
133 * are updated during setup..
134 */
135 { /* Asynchronous access */
136 .flags = IORESOURCE_MEM,
137 },
138 { /* Synchronous access */
139 .flags = IORESOURCE_MEM,
140 },
141 { /* IRQ */
142 .name = "mc",
143 .flags = IORESOURCE_IRQ,
144 },
145 };
146
147 static u64 tusb_dmamask = ~(u32)0;
148
149 static struct platform_device tusb_device = {
150 .name = "musb-tusb",
151 .id = -1,
152 .dev = {
153 .dma_mask = &tusb_dmamask,
154 .coherent_dma_mask = 0xffffffff,
155 },
156 .num_resources = ARRAY_SIZE(tusb_resources),
157 .resource = tusb_resources,
158 };
159
160
161 /* this may be called only from board-*.c setup code */
162 int __init
tusb6010_setup_interface(struct musb_hdrc_platform_data * data,unsigned ps_refclk,unsigned waitpin,unsigned async,unsigned sync,unsigned irq,unsigned dmachan)163 tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
164 unsigned ps_refclk, unsigned waitpin,
165 unsigned async, unsigned sync,
166 unsigned irq, unsigned dmachan)
167 {
168 int status;
169 static char error[] __initdata =
170 KERN_ERR "tusb6010 init error %d, %d\n";
171
172 /* ASYNC region, primarily for PIO */
173 status = gpmc_cs_request(async, SZ_16M, (unsigned long *)
174 &tusb_resources[0].start);
175 if (status < 0) {
176 printk(error, 1, status);
177 return status;
178 }
179 tusb_resources[0].end = tusb_resources[0].start + 0x9ff;
180 tusb_async.wait_pin = waitpin;
181 async_cs = async;
182
183 status = gpmc_cs_program_settings(async_cs, &tusb_async);
184 if (status < 0)
185 return status;
186
187 /* SYNC region, primarily for DMA */
188 status = gpmc_cs_request(sync, SZ_16M, (unsigned long *)
189 &tusb_resources[1].start);
190 if (status < 0) {
191 printk(error, 2, status);
192 return status;
193 }
194 tusb_resources[1].end = tusb_resources[1].start + 0x9ff;
195 tusb_sync.wait_pin = waitpin;
196 sync_cs = sync;
197
198 status = gpmc_cs_program_settings(sync_cs, &tusb_sync);
199 if (status < 0)
200 return status;
201
202 /* IRQ */
203 status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq");
204 if (status < 0) {
205 printk(error, 3, status);
206 return status;
207 }
208 tusb_resources[2].start = gpio_to_irq(irq);
209
210 /* set up memory timings ... can speed them up later */
211 if (!ps_refclk) {
212 printk(error, 4, status);
213 return -ENODEV;
214 }
215 refclk_psec = ps_refclk;
216 status = tusb6010_platform_retime(1);
217 if (status < 0) {
218 printk(error, 5, status);
219 return status;
220 }
221
222 /* finish device setup ... */
223 if (!data) {
224 printk(error, 6, status);
225 return -ENODEV;
226 }
227 tusb_device.dev.platform_data = data;
228
229 /* REVISIT let the driver know what DMA channels work */
230 if (!dmachan)
231 tusb_device.dev.dma_mask = NULL;
232 else {
233 /* assume OMAP 2420 ES2.0 and later */
234 if (dmachan & (1 << 0))
235 omap_mux_init_signal("sys_ndmareq0", 0);
236 if (dmachan & (1 << 1))
237 omap_mux_init_signal("sys_ndmareq1", 0);
238 if (dmachan & (1 << 2))
239 omap_mux_init_signal("sys_ndmareq2", 0);
240 if (dmachan & (1 << 3))
241 omap_mux_init_signal("sys_ndmareq3", 0);
242 if (dmachan & (1 << 4))
243 omap_mux_init_signal("sys_ndmareq4", 0);
244 if (dmachan & (1 << 5))
245 omap_mux_init_signal("sys_ndmareq5", 0);
246 }
247
248 /* so far so good ... register the device */
249 status = platform_device_register(&tusb_device);
250 if (status < 0) {
251 printk(error, 7, status);
252 return status;
253 }
254 return 0;
255 }
256