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 | |
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(gpmc_t: &t, gpmc_s: &tusb_async, dev_t: &dev_t); |
68 | |
69 | return gpmc_cs_set_timings(cs: async_cs, t: &t, s: &tusb_async); |
70 | } |
71 | |
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(gpmc_t: &t, gpmc_s: &tusb_sync, dev_t: &dev_t); |
95 | |
96 | return gpmc_cs_set_timings(cs: sync_cs, t: &t, s: &tusb_sync); |
97 | } |
98 | |
99 | /* tusb driver calls this when it changes the chip's clocking */ |
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 */ |
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(cs: async, size: SZ_16M, base: (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(cs: async_cs, p: &tusb_async); |
173 | if (status < 0) |
174 | return status; |
175 | |
176 | /* SYNC region, primarily for DMA */ |
177 | status = gpmc_cs_request(cs: sync, size: SZ_16M, base: (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(cs: sync_cs, p: &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(is_refclk: 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 | |