arch/arm/mach-omap2/usb-tusb6010.c

   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 }