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