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, &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 }