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 
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 
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 */
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
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