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/export.h>
15 #include <linux/platform_data/usb-omap.h>
16
17 #include <linux/usb/musb.h>
18
19 #include "usb-tusb6010.h"
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 static 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
125 static struct resource tusb_resources[] = {
126 /* Order is significant! The start/end fields
127 * are updated during setup..
128 */
129 { /* Asynchronous access */
130 .flags = IORESOURCE_MEM,
131 },
132 { /* Synchronous access */
133 .flags = IORESOURCE_MEM,
134 },
135 };
136
137 static u64 tusb_dmamask = ~(u32)0;
138
139 static struct platform_device tusb_device = {
140 .name = "musb-tusb",
141 .id = -1,
142 .dev = {
143 .dma_mask = &tusb_dmamask,
144 .coherent_dma_mask = 0xffffffff,
145 },
146 .num_resources = ARRAY_SIZE(tusb_resources),
147 .resource = tusb_resources,
148 };
149
150
151 /* this may be called only from board-*.c setup code */
tusb6010_setup_interface(struct musb_hdrc_platform_data * data,unsigned int ps_refclk,unsigned int waitpin,unsigned int async,unsigned int sync,unsigned int dmachan)152 int __init tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
153 unsigned int ps_refclk, unsigned int waitpin,
154 unsigned int async, unsigned int sync,
155 unsigned int dmachan)
156 {
157 int status;
158 static char error[] __initdata =
159 KERN_ERR "tusb6010 init error %d, %d\n";
160
161 /* ASYNC region, primarily for PIO */
162 status = gpmc_cs_request(async, SZ_16M, (unsigned long *)
163 &tusb_resources[0].start);
164 if (status < 0) {
165 printk(error, 1, status);
166 return status;
167 }
168 tusb_resources[0].end = tusb_resources[0].start + 0x9ff;
169 tusb_async.wait_pin = waitpin;
170 async_cs = async;
171
172 status = gpmc_cs_program_settings(async_cs, &tusb_async);
173 if (status < 0)
174 return status;
175
176 /* SYNC region, primarily for DMA */
177 status = gpmc_cs_request(sync, SZ_16M, (unsigned long *)
178 &tusb_resources[1].start);
179 if (status < 0) {
180 printk(error, 2, status);
181 return status;
182 }
183 tusb_resources[1].end = tusb_resources[1].start + 0x9ff;
184 tusb_sync.wait_pin = waitpin;
185 sync_cs = sync;
186
187 status = gpmc_cs_program_settings(sync_cs, &tusb_sync);
188 if (status < 0)
189 return status;
190
191 /* set up memory timings ... can speed them up later */
192 if (!ps_refclk) {
193 printk(error, 4, status);
194 return -ENODEV;
195 }
196 refclk_psec = ps_refclk;
197 status = tusb6010_platform_retime(1);
198 if (status < 0) {
199 printk(error, 5, status);
200 return status;
201 }
202
203 /* finish device setup ... */
204 if (!data) {
205 printk(error, 6, status);
206 return -ENODEV;
207 }
208 tusb_device.dev.platform_data = data;
209
210 /* so far so good ... register the device */
211 status = platform_device_register(&tusb_device);
212 if (status < 0) {
213 printk(error, 7, status);
214 return status;
215 }
216 return 0;
217 }
218