1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/mach-omap2/usb-tusb6010.c
4 *
5 * Copyright (C) 2006 Nokia Corporation
6 */
7
8 #include <linux/err.h>
9 #include <linux/string.h>
10 #include <linux/types.h>
11 #include <linux/errno.h>
12 #include <linux/delay.h>
13 #include <linux/platform_device.h>
14 #include <linux/gpio.h>
15 #include <linux/export.h>
16 #include <linux/platform_data/usb-omap.h>
17
18 #include <linux/usb/musb.h>
19
20 #include "gpmc.h"
21
22 static u8 async_cs, sync_cs;
23 static unsigned refclk_psec;
24
25 static struct gpmc_settings tusb_async = {
26 .wait_on_read = true,
27 .wait_on_write = true,
28 .device_width = GPMC_DEVWIDTH_16BIT,
29 .mux_add_data = GPMC_MUX_AD,
30 };
31
32 static struct gpmc_settings tusb_sync = {
33 .burst_read = true,
34 .burst_write = true,
35 .sync_read = true,
36 .sync_write = true,
37 .wait_on_read = true,
38 .wait_on_write = true,
39 .burst_len = GPMC_BURST_16,
40 .device_width = GPMC_DEVWIDTH_16BIT,
41 .mux_add_data = GPMC_MUX_AD,
42 };
43
44 /* NOTE: timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */
45
tusb_set_async_mode(unsigned sysclk_ps)46 static int tusb_set_async_mode(unsigned sysclk_ps)
47 {
48 struct gpmc_device_timings dev_t;
49 struct gpmc_timings t;
50 unsigned t_acsnh_advnh = sysclk_ps + 3000;
51
52 memset(&dev_t, 0, sizeof(dev_t));
53
54 dev_t.t_ceasu = 8 * 1000;
55 dev_t.t_avdasu = t_acsnh_advnh - 7000;
56 dev_t.t_ce_avd = 1000;
57 dev_t.t_avdp_r = t_acsnh_advnh;
58 dev_t.t_oeasu = t_acsnh_advnh + 1000;
59 dev_t.t_oe = 300;
60 dev_t.t_cez_r = 7000;
61 dev_t.t_cez_w = dev_t.t_cez_r;
62 dev_t.t_avdp_w = t_acsnh_advnh;
63 dev_t.t_weasu = t_acsnh_advnh + 1000;
64 dev_t.t_wpl = 300;
65 dev_t.cyc_aavdh_we = 1;
66
67 gpmc_calc_timings(&t, &tusb_async, &dev_t);
68
69 return gpmc_cs_set_timings(async_cs, &t, &tusb_async);
70 }
71
tusb_set_sync_mode(unsigned sysclk_ps)72 static int tusb_set_sync_mode(unsigned sysclk_ps)
73 {
74 struct gpmc_device_timings dev_t;
75 struct gpmc_timings t;
76 unsigned t_scsnh_advnh = sysclk_ps + 3000;
77
78 memset(&dev_t, 0, sizeof(dev_t));
79
80 dev_t.clk = 11100;
81 dev_t.t_bacc = 1000;
82 dev_t.t_ces = 1000;
83 dev_t.t_ceasu = 8 * 1000;
84 dev_t.t_avdasu = t_scsnh_advnh - 7000;
85 dev_t.t_ce_avd = 1000;
86 dev_t.t_avdp_r = t_scsnh_advnh;
87 dev_t.cyc_aavdh_oe = 3;
88 dev_t.cyc_oe = 5;
89 dev_t.t_ce_rdyz = 7000;
90 dev_t.t_avdp_w = t_scsnh_advnh;
91 dev_t.cyc_aavdh_we = 3;
92 dev_t.cyc_wpl = 6;
93
94 gpmc_calc_timings(&t, &tusb_sync, &dev_t);
95
96 return gpmc_cs_set_timings(sync_cs, &t, &tusb_sync);
97 }
98
99 /* tusb driver calls this when it changes the chip's clocking */
tusb6010_platform_retime(unsigned is_refclk)100 int tusb6010_platform_retime(unsigned is_refclk)
101 {
102 static const char error[] =
103 KERN_ERR "tusb6010 %s retime error %d\n";
104
105 unsigned sysclk_ps;
106 int status;
107
108 if (!refclk_psec)
109 return -ENODEV;
110
111 sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;
112
113 status = tusb_set_async_mode(sysclk_ps);
114 if (status < 0) {
115 printk(error, "async", status);
116 goto done;
117 }
118 status = tusb_set_sync_mode(sysclk_ps);
119 if (status < 0)
120 printk(error, "sync", status);
121 done:
122 return status;
123 }
124 EXPORT_SYMBOL_GPL(tusb6010_platform_retime);
125
126 static struct resource tusb_resources[] = {
127 /* Order is significant! The start/end fields
128 * are updated during setup..
129 */
130 { /* Asynchronous access */
131 .flags = IORESOURCE_MEM,
132 },
133 { /* Synchronous access */
134 .flags = IORESOURCE_MEM,
135 },
136 { /* IRQ */
137 .name = "mc",
138 .flags = IORESOURCE_IRQ,
139 },
140 };
141
142 static u64 tusb_dmamask = ~(u32)0;
143
144 static struct platform_device tusb_device = {
145 .name = "musb-tusb",
146 .id = -1,
147 .dev = {
148 .dma_mask = &tusb_dmamask,
149 .coherent_dma_mask = 0xffffffff,
150 },
151 .num_resources = ARRAY_SIZE(tusb_resources),
152 .resource = tusb_resources,
153 };
154
155
156 /* this may be called only from board-*.c setup code */
157 int __init
tusb6010_setup_interface(struct musb_hdrc_platform_data * data,unsigned ps_refclk,unsigned waitpin,unsigned async,unsigned sync,unsigned irq,unsigned dmachan)158 tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
159 unsigned ps_refclk, unsigned waitpin,
160 unsigned async, unsigned sync,
161 unsigned irq, unsigned dmachan)
162 {
163 int status;
164 static char error[] __initdata =
165 KERN_ERR "tusb6010 init error %d, %d\n";
166
167 /* ASYNC region, primarily for PIO */
168 status = gpmc_cs_request(async, SZ_16M, (unsigned long *)
169 &tusb_resources[0].start);
170 if (status < 0) {
171 printk(error, 1, status);
172 return status;
173 }
174 tusb_resources[0].end = tusb_resources[0].start + 0x9ff;
175 tusb_async.wait_pin = waitpin;
176 async_cs = async;
177
178 status = gpmc_cs_program_settings(async_cs, &tusb_async);
179 if (status < 0)
180 return status;
181
182 /* SYNC region, primarily for DMA */
183 status = gpmc_cs_request(sync, SZ_16M, (unsigned long *)
184 &tusb_resources[1].start);
185 if (status < 0) {
186 printk(error, 2, status);
187 return status;
188 }
189 tusb_resources[1].end = tusb_resources[1].start + 0x9ff;
190 tusb_sync.wait_pin = waitpin;
191 sync_cs = sync;
192
193 status = gpmc_cs_program_settings(sync_cs, &tusb_sync);
194 if (status < 0)
195 return status;
196
197 /* IRQ */
198 status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq");
199 if (status < 0) {
200 printk(error, 3, status);
201 return status;
202 }
203 tusb_resources[2].start = gpio_to_irq(irq);
204
205 /* set up memory timings ... can speed them up later */
206 if (!ps_refclk) {
207 printk(error, 4, status);
208 return -ENODEV;
209 }
210 refclk_psec = ps_refclk;
211 status = tusb6010_platform_retime(1);
212 if (status < 0) {
213 printk(error, 5, status);
214 return status;
215 }
216
217 /* finish device setup ... */
218 if (!data) {
219 printk(error, 6, status);
220 return -ENODEV;
221 }
222 tusb_device.dev.platform_data = data;
223
224 /* so far so good ... register the device */
225 status = platform_device_register(&tusb_device);
226 if (status < 0) {
227 printk(error, 7, status);
228 return status;
229 }
230 return 0;
231 }
232