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, &tusb_async); 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 99 gpmc_calc_timings(&t, &tusb_sync, &dev_t); 100 101 return gpmc_cs_set_timings(sync_cs, &t, &tusb_sync); 102 } 103 104 /* tusb driver calls this when it changes the chip's clocking */ 105 int tusb6010_platform_retime(unsigned is_refclk) 106 { 107 static const char error[] = 108 KERN_ERR "tusb6010 %s retime error %d\n"; 109 110 unsigned sysclk_ps; 111 int status; 112 113 if (!refclk_psec) 114 return -ENODEV; 115 116 sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60; 117 118 status = tusb_set_async_mode(sysclk_ps); 119 if (status < 0) { 120 printk(error, "async", status); 121 goto done; 122 } 123 status = tusb_set_sync_mode(sysclk_ps); 124 if (status < 0) 125 printk(error, "sync", status); 126 done: 127 return status; 128 } 129 EXPORT_SYMBOL_GPL(tusb6010_platform_retime); 130 131 static struct resource tusb_resources[] = { 132 /* Order is significant! The start/end fields 133 * are updated during setup.. 134 */ 135 { /* Asynchronous access */ 136 .flags = IORESOURCE_MEM, 137 }, 138 { /* Synchronous access */ 139 .flags = IORESOURCE_MEM, 140 }, 141 { /* IRQ */ 142 .name = "mc", 143 .flags = IORESOURCE_IRQ, 144 }, 145 }; 146 147 static u64 tusb_dmamask = ~(u32)0; 148 149 static struct platform_device tusb_device = { 150 .name = "musb-tusb", 151 .id = -1, 152 .dev = { 153 .dma_mask = &tusb_dmamask, 154 .coherent_dma_mask = 0xffffffff, 155 }, 156 .num_resources = ARRAY_SIZE(tusb_resources), 157 .resource = tusb_resources, 158 }; 159 160 161 /* this may be called only from board-*.c setup code */ 162 int __init 163 tusb6010_setup_interface(struct musb_hdrc_platform_data *data, 164 unsigned ps_refclk, unsigned waitpin, 165 unsigned async, unsigned sync, 166 unsigned irq, unsigned dmachan) 167 { 168 int status; 169 static char error[] __initdata = 170 KERN_ERR "tusb6010 init error %d, %d\n"; 171 172 /* ASYNC region, primarily for PIO */ 173 status = gpmc_cs_request(async, SZ_16M, (unsigned long *) 174 &tusb_resources[0].start); 175 if (status < 0) { 176 printk(error, 1, status); 177 return status; 178 } 179 tusb_resources[0].end = tusb_resources[0].start + 0x9ff; 180 tusb_async.wait_pin = waitpin; 181 async_cs = async; 182 183 status = gpmc_cs_program_settings(async_cs, &tusb_async); 184 if (status < 0) 185 return status; 186 187 /* SYNC region, primarily for DMA */ 188 status = gpmc_cs_request(sync, SZ_16M, (unsigned long *) 189 &tusb_resources[1].start); 190 if (status < 0) { 191 printk(error, 2, status); 192 return status; 193 } 194 tusb_resources[1].end = tusb_resources[1].start + 0x9ff; 195 tusb_sync.wait_pin = waitpin; 196 sync_cs = sync; 197 198 status = gpmc_cs_program_settings(sync_cs, &tusb_sync); 199 if (status < 0) 200 return status; 201 202 /* IRQ */ 203 status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq"); 204 if (status < 0) { 205 printk(error, 3, status); 206 return status; 207 } 208 tusb_resources[2].start = gpio_to_irq(irq); 209 210 /* set up memory timings ... can speed them up later */ 211 if (!ps_refclk) { 212 printk(error, 4, status); 213 return -ENODEV; 214 } 215 refclk_psec = ps_refclk; 216 status = tusb6010_platform_retime(1); 217 if (status < 0) { 218 printk(error, 5, status); 219 return status; 220 } 221 222 /* finish device setup ... */ 223 if (!data) { 224 printk(error, 6, status); 225 return -ENODEV; 226 } 227 tusb_device.dev.platform_data = data; 228 229 /* REVISIT let the driver know what DMA channels work */ 230 if (!dmachan) 231 tusb_device.dev.dma_mask = NULL; 232 else { 233 /* assume OMAP 2420 ES2.0 and later */ 234 if (dmachan & (1 << 0)) 235 omap_mux_init_signal("sys_ndmareq0", 0); 236 if (dmachan & (1 << 1)) 237 omap_mux_init_signal("sys_ndmareq1", 0); 238 if (dmachan & (1 << 2)) 239 omap_mux_init_signal("sys_ndmareq2", 0); 240 if (dmachan & (1 << 3)) 241 omap_mux_init_signal("sys_ndmareq3", 0); 242 if (dmachan & (1 << 4)) 243 omap_mux_init_signal("sys_ndmareq4", 0); 244 if (dmachan & (1 << 5)) 245 omap_mux_init_signal("sys_ndmareq5", 0); 246 } 247 248 /* so far so good ... register the device */ 249 status = platform_device_register(&tusb_device); 250 if (status < 0) { 251 printk(error, 7, status); 252 return status; 253 } 254 return 0; 255 } 256