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 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 }