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/string.h>
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14 #include <linux/delay.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/gpio.h>
  17 #include <linux/export.h>
  18 #include <linux/platform_data/usb-omap.h>
  19
  20 #include <linux/usb/musb.h>
  21
  22 #include "gpmc.h"
  23
  24 #include "mux.h"
  25
  26 static u8               async_cs, sync_cs;
  27 static unsigned         refclk_psec;
  28
  29
  30 /* NOTE:  timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */
  31
  32 static int tusb_set_async_mode(unsigned sysclk_ps)
  33 {
  34         struct gpmc_device_timings dev_t;
  35         struct gpmc_timings     t;
  36         unsigned                t_acsnh_advnh = sysclk_ps + 3000;
  37
  38         memset(&dev_t, 0, sizeof(dev_t));
  39
  40         dev_t.mux = true;
  41
  42         dev_t.t_ceasu = 8 * 1000;
  43         dev_t.t_avdasu = t_acsnh_advnh - 7000;
  44         dev_t.t_ce_avd = 1000;
  45         dev_t.t_avdp_r = t_acsnh_advnh;
  46         dev_t.t_oeasu = t_acsnh_advnh + 1000;
  47         dev_t.t_oe = 300;
  48         dev_t.t_cez_r = 7000;
  49         dev_t.t_cez_w = dev_t.t_cez_r;
  50         dev_t.t_avdp_w = t_acsnh_advnh;
  51         dev_t.t_weasu = t_acsnh_advnh + 1000;
  52         dev_t.t_wpl = 300;
  53         dev_t.cyc_aavdh_we = 1;
  54
  55         gpmc_calc_timings(&t, &dev_t);
  56
  57         return gpmc_cs_set_timings(async_cs, &t);
  58 }
  59
  60 static int tusb_set_sync_mode(unsigned sysclk_ps)
  61 {
  62         struct gpmc_device_timings dev_t;
  63         struct gpmc_timings     t;
  64         unsigned                t_scsnh_advnh = sysclk_ps + 3000;
  65
  66         memset(&dev_t, 0, sizeof(dev_t));
  67
  68         dev_t.mux = true;
  69         dev_t.sync_read = true;
  70         dev_t.sync_write = true;
  71
  72         dev_t.clk = 11100;
  73         dev_t.t_bacc = 1000;
  74         dev_t.t_ces = 1000;
  75         dev_t.t_ceasu = 8 * 1000;
  76         dev_t.t_avdasu = t_scsnh_advnh - 7000;
  77         dev_t.t_ce_avd = 1000;
  78         dev_t.t_avdp_r = t_scsnh_advnh;
  79         dev_t.cyc_aavdh_oe = 3;
  80         dev_t.cyc_oe = 5;
  81         dev_t.t_ce_rdyz = 7000;
  82         dev_t.t_avdp_w = t_scsnh_advnh;
  83         dev_t.cyc_aavdh_we = 3;
  84         dev_t.cyc_wpl = 6;
  85         dev_t.t_ce_rdyz = 7000;
  86
  87         gpmc_calc_timings(&t, &dev_t);
  88
  89         return gpmc_cs_set_timings(sync_cs, &t);
  90 }
  91
  92 /* tusb driver calls this when it changes the chip's clocking */
  93 int tusb6010_platform_retime(unsigned is_refclk)
  94 {
  95         static const char       error[] =
  96                 KERN_ERR "tusb6010 %s retime error %d\n";
  97
  98         unsigned        sysclk_ps;
  99         int             status;
 100
 101         if (!refclk_psec)
 102                 return -ENODEV;
 103
 104         sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;
 105
 106         status = tusb_set_async_mode(sysclk_ps);
 107         if (status < 0) {
 108                 printk(error, "async", status);
 109                 goto done;
 110         }
 111         status = tusb_set_sync_mode(sysclk_ps);
 112         if (status < 0)
 113                 printk(error, "sync", status);
 114 done:
 115         return status;
 116 }
 117 EXPORT_SYMBOL_GPL(tusb6010_platform_retime);
 118
 119 static struct resource tusb_resources[] = {
 120         /* Order is significant!  The start/end fields
 121          * are updated during setup..
 122          */
 123         { /* Asynchronous access */
 124                 .flags  = IORESOURCE_MEM,
 125         },
 126         { /* Synchronous access */
 127                 .flags  = IORESOURCE_MEM,
 128         },
 129         { /* IRQ */
 130                 .name   = "mc",
 131                 .flags  = IORESOURCE_IRQ,
 132         },
 133 };
 134
 135 static u64 tusb_dmamask = ~(u32)0;
 136
 137 static struct platform_device tusb_device = {
 138         .name           = "musb-tusb",
 139         .id             = -1,
 140         .dev = {
 141                 .dma_mask               = &tusb_dmamask,
 142                 .coherent_dma_mask      = 0xffffffff,
 143         },
 144         .num_resources  = ARRAY_SIZE(tusb_resources),
 145         .resource       = tusb_resources,
 146 };
 147
 148
 149 /* this may be called only from board-*.c setup code */
 150 int __init
 151 tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
 152                 unsigned ps_refclk, unsigned waitpin,
 153                 unsigned async, unsigned sync,
 154                 unsigned irq, unsigned dmachan)
 155 {
 156         int             status;
 157         static char     error[] __initdata =
 158                 KERN_ERR "tusb6010 init error %d, %d\n";
 159
 160         /* ASYNC region, primarily for PIO */
 161         status = gpmc_cs_request(async, SZ_16M, (unsigned long *)
 162                                 &tusb_resources[0].start);
 163         if (status < 0) {
 164                 printk(error, 1, status);
 165                 return status;
 166         }
 167         tusb_resources[0].end = tusb_resources[0].start + 0x9ff;
 168         async_cs = async;
 169         gpmc_cs_write_reg(async, GPMC_CS_CONFIG1,
 170                           GPMC_CONFIG1_PAGE_LEN(2)
 171                         | GPMC_CONFIG1_WAIT_READ_MON
 172                         | GPMC_CONFIG1_WAIT_WRITE_MON
 173                         | GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
 174                         | GPMC_CONFIG1_READTYPE_ASYNC
 175                         | GPMC_CONFIG1_WRITETYPE_ASYNC
 176                         | GPMC_CONFIG1_DEVICESIZE_16
 177                         | GPMC_CONFIG1_DEVICETYPE_NOR
 178                         | GPMC_CONFIG1_MUXADDDATA);
 179
 180
 181         /* SYNC region, primarily for DMA */
 182         status = gpmc_cs_request(sync, SZ_16M, (unsigned long *)
 183                                 &tusb_resources[1].start);
 184         if (status < 0) {
 185                 printk(error, 2, status);
 186                 return status;
 187         }
 188         tusb_resources[1].end = tusb_resources[1].start + 0x9ff;
 189         sync_cs = sync;
 190         gpmc_cs_write_reg(sync, GPMC_CS_CONFIG1,
 191                           GPMC_CONFIG1_READMULTIPLE_SUPP
 192                         | GPMC_CONFIG1_READTYPE_SYNC
 193                         | GPMC_CONFIG1_WRITEMULTIPLE_SUPP
 194                         | GPMC_CONFIG1_WRITETYPE_SYNC
 195                         | GPMC_CONFIG1_PAGE_LEN(2)
 196                         | GPMC_CONFIG1_WAIT_READ_MON
 197                         | GPMC_CONFIG1_WAIT_WRITE_MON
 198                         | GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
 199                         | GPMC_CONFIG1_DEVICESIZE_16
 200                         | GPMC_CONFIG1_DEVICETYPE_NOR
 201                         | GPMC_CONFIG1_MUXADDDATA
 202                         /* fclk divider gets set later */
 203                         );
 204
 205         /* IRQ */
 206         status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq");
 207         if (status < 0) {
 208                 printk(error, 3, status);
 209                 return status;
 210         }
 211         tusb_resources[2].start = gpio_to_irq(irq);
 212
 213         /* set up memory timings ... can speed them up later */
 214         if (!ps_refclk) {
 215                 printk(error, 4, status);
 216                 return -ENODEV;
 217         }
 218         refclk_psec = ps_refclk;
 219         status = tusb6010_platform_retime(1);
 220         if (status < 0) {
 221                 printk(error, 5, status);
 222                 return status;
 223         }
 224
 225         /* finish device setup ... */
 226         if (!data) {
 227                 printk(error, 6, status);
 228                 return -ENODEV;
 229         }
 230         tusb_device.dev.platform_data = data;
 231
 232         /* REVISIT let the driver know what DMA channels work */
 233         if (!dmachan)
 234                 tusb_device.dev.dma_mask = NULL;
 235         else {
 236                 /* assume OMAP 2420 ES2.0 and later */
 237                 if (dmachan & (1 << 0))
 238                         omap_mux_init_signal("sys_ndmareq0", 0);
 239                 if (dmachan & (1 << 1))
 240                         omap_mux_init_signal("sys_ndmareq1", 0);
 241                 if (dmachan & (1 << 2))
 242                         omap_mux_init_signal("sys_ndmareq2", 0);
 243                 if (dmachan & (1 << 3))
 244                         omap_mux_init_signal("sys_ndmareq3", 0);
 245                 if (dmachan & (1 << 4))
 246                         omap_mux_init_signal("sys_ndmareq4", 0);
 247                 if (dmachan & (1 << 5))
 248                         omap_mux_init_signal("sys_ndmareq5", 0);
 249         }
 250
 251         /* so far so good ... register the device */
 252         status = platform_device_register(&tusb_device);
 253         if (status < 0) {
 254                 printk(error, 7, status);
 255                 return status;
 256         }
 257         return 0;
 258 }