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 #include "mux.h" 26 27 static u8 async_cs, sync_cs; 28 static unsigned refclk_psec; 29 30 static struct gpmc_settings tusb_async = { 31 .wait_on_read = true, 32 .wait_on_write = true, 33 .device_width = GPMC_DEVWIDTH_16BIT, 34 .mux_add_data = GPMC_MUX_AD, 35 }; 36 37 static struct gpmc_settings tusb_sync = { 38 .burst_read = true, 39 .burst_write = true, 40 .sync_read = true, 41 .sync_write = true, 42 .wait_on_read = true, 43 .wait_on_write = true, 44 .burst_len = GPMC_BURST_16, 45 .device_width = GPMC_DEVWIDTH_16BIT, 46 .mux_add_data = GPMC_MUX_AD, 47 }; 48 49 /* NOTE: timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */ 50 51 static int tusb_set_async_mode(unsigned sysclk_ps) 52 { 53 struct gpmc_device_timings dev_t; 54 struct gpmc_timings t; 55 unsigned t_acsnh_advnh = sysclk_ps + 3000; 56 57 memset(&dev_t, 0, sizeof(dev_t)); 58 59 dev_t.t_ceasu = 8 * 1000; 60 dev_t.t_avdasu = t_acsnh_advnh - 7000; 61 dev_t.t_ce_avd = 1000; 62 dev_t.t_avdp_r = t_acsnh_advnh; 63 dev_t.t_oeasu = t_acsnh_advnh + 1000; 64 dev_t.t_oe = 300; 65 dev_t.t_cez_r = 7000; 66 dev_t.t_cez_w = dev_t.t_cez_r; 67 dev_t.t_avdp_w = t_acsnh_advnh; 68 dev_t.t_weasu = t_acsnh_advnh + 1000; 69 dev_t.t_wpl = 300; 70 dev_t.cyc_aavdh_we = 1; 71 72 gpmc_calc_timings(&t, &tusb_async, &dev_t); 73 74 return gpmc_cs_set_timings(async_cs, &t); 75 } 76 77 static int tusb_set_sync_mode(unsigned sysclk_ps) 78 { 79 struct gpmc_device_timings dev_t; 80 struct gpmc_timings t; 81 unsigned t_scsnh_advnh = sysclk_ps + 3000; 82 83 memset(&dev_t, 0, sizeof(dev_t)); 84 85 dev_t.clk = 11100; 86 dev_t.t_bacc = 1000; 87 dev_t.t_ces = 1000; 88 dev_t.t_ceasu = 8 * 1000; 89 dev_t.t_avdasu = t_scsnh_advnh - 7000; 90 dev_t.t_ce_avd = 1000; 91 dev_t.t_avdp_r = t_scsnh_advnh; 92 dev_t.cyc_aavdh_oe = 3; 93 dev_t.cyc_oe = 5; 94 dev_t.t_ce_rdyz = 7000; 95 dev_t.t_avdp_w = t_scsnh_advnh; 96 dev_t.cyc_aavdh_we = 3; 97 dev_t.cyc_wpl = 6; 98 dev_t.t_ce_rdyz = 7000; 99 100 gpmc_calc_timings(&t, &tusb_sync, &dev_t); 101 102 return gpmc_cs_set_timings(sync_cs, &t); 103 } 104 105 /* tusb driver calls this when it changes the chip's clocking */ 106 int tusb6010_platform_retime(unsigned is_refclk) 107 { 108 static const char error[] = 109 KERN_ERR "tusb6010 %s retime error %d\n"; 110 111 unsigned sysclk_ps; 112 int status; 113 114 if (!refclk_psec) 115 return -ENODEV; 116 117 sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60; 118 119 status = tusb_set_async_mode(sysclk_ps); 120 if (status < 0) { 121 printk(error, "async", status); 122 goto done; 123 } 124 status = tusb_set_sync_mode(sysclk_ps); 125 if (status < 0) 126 printk(error, "sync", status); 127 done: 128 return status; 129 } 130 EXPORT_SYMBOL_GPL(tusb6010_platform_retime); 131 132 static struct resource tusb_resources[] = { 133 /* Order is significant! The start/end fields 134 * are updated during setup.. 135 */ 136 { /* Asynchronous access */ 137 .flags = IORESOURCE_MEM, 138 }, 139 { /* Synchronous access */ 140 .flags = IORESOURCE_MEM, 141 }, 142 { /* IRQ */ 143 .name = "mc", 144 .flags = IORESOURCE_IRQ, 145 }, 146 }; 147 148 static u64 tusb_dmamask = ~(u32)0; 149 150 static struct platform_device tusb_device = { 151 .name = "musb-tusb", 152 .id = -1, 153 .dev = { 154 .dma_mask = &tusb_dmamask, 155 .coherent_dma_mask = 0xffffffff, 156 }, 157 .num_resources = ARRAY_SIZE(tusb_resources), 158 .resource = tusb_resources, 159 }; 160 161 162 /* this may be called only from board-*.c setup code */ 163 int __init 164 tusb6010_setup_interface(struct musb_hdrc_platform_data *data, 165 unsigned ps_refclk, unsigned waitpin, 166 unsigned async, unsigned sync, 167 unsigned irq, unsigned dmachan) 168 { 169 int status; 170 static char error[] __initdata = 171 KERN_ERR "tusb6010 init error %d, %d\n"; 172 173 /* ASYNC region, primarily for PIO */ 174 status = gpmc_cs_request(async, SZ_16M, (unsigned long *) 175 &tusb_resources[0].start); 176 if (status < 0) { 177 printk(error, 1, status); 178 return status; 179 } 180 tusb_resources[0].end = tusb_resources[0].start + 0x9ff; 181 tusb_async.wait_pin = waitpin; 182 async_cs = async; 183 184 status = gpmc_cs_program_settings(async_cs, &tusb_async); 185 if (status < 0) 186 return status; 187 188 /* SYNC region, primarily for DMA */ 189 status = gpmc_cs_request(sync, SZ_16M, (unsigned long *) 190 &tusb_resources[1].start); 191 if (status < 0) { 192 printk(error, 2, status); 193 return status; 194 } 195 tusb_resources[1].end = tusb_resources[1].start + 0x9ff; 196 tusb_sync.wait_pin = waitpin; 197 sync_cs = sync; 198 199 status = gpmc_cs_program_settings(sync_cs, &tusb_sync); 200 if (status < 0) 201 return status; 202 203 /* IRQ */ 204 status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq"); 205 if (status < 0) { 206 printk(error, 3, status); 207 return status; 208 } 209 tusb_resources[2].start = gpio_to_irq(irq); 210 211 /* set up memory timings ... can speed them up later */ 212 if (!ps_refclk) { 213 printk(error, 4, status); 214 return -ENODEV; 215 } 216 refclk_psec = ps_refclk; 217 status = tusb6010_platform_retime(1); 218 if (status < 0) { 219 printk(error, 5, status); 220 return status; 221 } 222 223 /* finish device setup ... */ 224 if (!data) { 225 printk(error, 6, status); 226 return -ENODEV; 227 } 228 tusb_device.dev.platform_data = data; 229 230 /* REVISIT let the driver know what DMA channels work */ 231 if (!dmachan) 232 tusb_device.dev.dma_mask = NULL; 233 else { 234 /* assume OMAP 2420 ES2.0 and later */ 235 if (dmachan & (1 << 0)) 236 omap_mux_init_signal("sys_ndmareq0", 0); 237 if (dmachan & (1 << 1)) 238 omap_mux_init_signal("sys_ndmareq1", 0); 239 if (dmachan & (1 << 2)) 240 omap_mux_init_signal("sys_ndmareq2", 0); 241 if (dmachan & (1 << 3)) 242 omap_mux_init_signal("sys_ndmareq3", 0); 243 if (dmachan & (1 << 4)) 244 omap_mux_init_signal("sys_ndmareq4", 0); 245 if (dmachan & (1 << 5)) 246 omap_mux_init_signal("sys_ndmareq5", 0); 247 } 248 249 /* so far so good ... register the device */ 250 status = platform_device_register(&tusb_device); 251 if (status < 0) { 252 printk(error, 7, status); 253 return status; 254 } 255 return 0; 256 } 257