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   1 /*
   2  * linux/arch/arm/mach-omap1/mcbsp.c
   3  *
   4  * Copyright (C) 2008 Instituto Nokia de Tecnologia
   5  * Contact: Eduardo Valentin <eduardo.valentin@indt.org.br>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Multichannel mode not supported.
  12  */
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/io.h>
  18 #include <linux/platform_device.h>
  19
  20 #include <mach/irqs.h>
  21 #include <mach/dma.h>
  22 #include <mach/irqs.h>
  23 #include <mach/mux.h>
  24 #include <mach/cpu.h>
  25 #include <mach/mcbsp.h>
  26 #include <mach/dsp_common.h>
  27
  28 #define DPS_RSTCT2_PER_EN       (1 << 0)
  29 #define DSP_RSTCT2_WD_PER_EN    (1 << 1)
  30
  31 struct mcbsp_internal_clk {
  32         struct clk clk;
  33         struct clk **childs;
  34         int n_childs;
  35 };
  36
  37 #if defined(CONFIG_ARCH_OMAP15XX) || defined(CONFIG_ARCH_OMAP16XX)
  38 static void omap_mcbsp_clk_init(struct mcbsp_internal_clk *mclk)
  39 {
  40         const char *clk_names[] = { "dsp_ck", "api_ck", "dspxor_ck" };
  41         int i;
  42
  43         mclk->n_childs = ARRAY_SIZE(clk_names);
  44         mclk->childs = kzalloc(mclk->n_childs * sizeof(struct clk *),
  45                                 GFP_KERNEL);
  46
  47         for (i = 0; i < mclk->n_childs; i++) {
  48                 /* We fake a platform device to get correct device id */
  49                 struct platform_device pdev;
  50
  51                 pdev.dev.bus = &platform_bus_type;
  52                 pdev.id = mclk->clk.id;
  53                 mclk->childs[i] = clk_get(&pdev.dev, clk_names[i]);
  54                 if (IS_ERR(mclk->childs[i]))
  55                         printk(KERN_ERR "Could not get clock %s (%d).\n",
  56                                 clk_names[i], mclk->clk.id);
  57         }
  58 }
  59
  60 static int omap_mcbsp_clk_enable(struct clk *clk)
  61 {
  62         struct mcbsp_internal_clk *mclk = container_of(clk,
  63                                         struct mcbsp_internal_clk, clk);
  64         int i;
  65
  66         for (i = 0; i < mclk->n_childs; i++)
  67                 clk_enable(mclk->childs[i]);
  68         return 0;
  69 }
  70
  71 static void omap_mcbsp_clk_disable(struct clk *clk)
  72 {
  73         struct mcbsp_internal_clk *mclk = container_of(clk,
  74                                         struct mcbsp_internal_clk, clk);
  75         int i;
  76
  77         for (i = 0; i < mclk->n_childs; i++)
  78                 clk_disable(mclk->childs[i]);
  79 }
  80
  81 static struct mcbsp_internal_clk omap_mcbsp_clks[] = {
  82         {
  83                 .clk = {
  84                         .name           = "mcbsp_clk",
  85                         .id             = 1,
  86                         .enable         = omap_mcbsp_clk_enable,
  87                         .disable        = omap_mcbsp_clk_disable,
  88                 },
  89         },
  90         {
  91                 .clk = {
  92                         .name           = "mcbsp_clk",
  93                         .id             = 3,
  94                         .enable         = omap_mcbsp_clk_enable,
  95                         .disable        = omap_mcbsp_clk_disable,
  96                 },
  97         },
  98 };
  99
 100 #define omap_mcbsp_clks_size    ARRAY_SIZE(omap_mcbsp_clks)
 101 #else
 102 #define omap_mcbsp_clks_size    0
 103 static struct mcbsp_internal_clk __initdata *omap_mcbsp_clks;
 104 static inline void omap_mcbsp_clk_init(struct mcbsp_internal_clk *mclk)
 105 { }
 106 #endif
 107
 108 static void omap1_mcbsp_request(unsigned int id)
 109 {
 110         /*
 111          * On 1510, 1610 and 1710, McBSP1 and McBSP3
 112          * are DSP public peripherals.
 113          */
 114         if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3) {
 115                 omap_dsp_request_mem();
 116                 /*
 117                  * DSP external peripheral reset
 118                  * FIXME: This should be moved to dsp code
 119                  */
 120                 __raw_writew(__raw_readw(DSP_RSTCT2) | DPS_RSTCT2_PER_EN |
 121                                 DSP_RSTCT2_WD_PER_EN, DSP_RSTCT2);
 122         }
 123 }
 124
 125 static void omap1_mcbsp_free(unsigned int id)
 126 {
 127         if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3)
 128                 omap_dsp_release_mem();
 129 }
 130
 131 static struct omap_mcbsp_ops omap1_mcbsp_ops = {
 132         .request        = omap1_mcbsp_request,
 133         .free           = omap1_mcbsp_free,
 134 };
 135
 136 #ifdef CONFIG_ARCH_OMAP730
 137 static struct omap_mcbsp_platform_data omap730_mcbsp_pdata[] = {
 138         {
 139                 .phys_base      = OMAP730_MCBSP1_BASE,
 140                 .dma_rx_sync    = OMAP_DMA_MCBSP1_RX,
 141                 .dma_tx_sync    = OMAP_DMA_MCBSP1_TX,
 142                 .rx_irq         = INT_730_McBSP1RX,
 143                 .tx_irq         = INT_730_McBSP1TX,
 144                 .ops            = &omap1_mcbsp_ops,
 145         },
 146         {
 147                 .phys_base      = OMAP730_MCBSP2_BASE,
 148                 .dma_rx_sync    = OMAP_DMA_MCBSP3_RX,
 149                 .dma_tx_sync    = OMAP_DMA_MCBSP3_TX,
 150                 .rx_irq         = INT_730_McBSP2RX,
 151                 .tx_irq         = INT_730_McBSP2TX,
 152                 .ops            = &omap1_mcbsp_ops,
 153         },
 154 };
 155 #define OMAP730_MCBSP_PDATA_SZ          ARRAY_SIZE(omap730_mcbsp_pdata)
 156 #else
 157 #define omap730_mcbsp_pdata             NULL
 158 #define OMAP730_MCBSP_PDATA_SZ          0
 159 #endif
 160
 161 #ifdef CONFIG_ARCH_OMAP15XX
 162 static struct omap_mcbsp_platform_data omap15xx_mcbsp_pdata[] = {
 163         {
 164                 .phys_base      = OMAP1510_MCBSP1_BASE,
 165                 .dma_rx_sync    = OMAP_DMA_MCBSP1_RX,
 166                 .dma_tx_sync    = OMAP_DMA_MCBSP1_TX,
 167                 .rx_irq         = INT_McBSP1RX,
 168                 .tx_irq         = INT_McBSP1TX,
 169                 .ops            = &omap1_mcbsp_ops,
 170                 .clk_name       = "mcbsp_clk",
 171                 },
 172         {
 173                 .phys_base      = OMAP1510_MCBSP2_BASE,
 174                 .dma_rx_sync    = OMAP_DMA_MCBSP2_RX,
 175                 .dma_tx_sync    = OMAP_DMA_MCBSP2_TX,
 176                 .rx_irq         = INT_1510_SPI_RX,
 177                 .tx_irq         = INT_1510_SPI_TX,
 178                 .ops            = &omap1_mcbsp_ops,
 179         },
 180         {
 181                 .phys_base      = OMAP1510_MCBSP3_BASE,
 182                 .dma_rx_sync    = OMAP_DMA_MCBSP3_RX,
 183                 .dma_tx_sync    = OMAP_DMA_MCBSP3_TX,
 184                 .rx_irq         = INT_McBSP3RX,
 185                 .tx_irq         = INT_McBSP3TX,
 186                 .ops            = &omap1_mcbsp_ops,
 187                 .clk_name       = "mcbsp_clk",
 188         },
 189 };
 190 #define OMAP15XX_MCBSP_PDATA_SZ         ARRAY_SIZE(omap15xx_mcbsp_pdata)
 191 #else
 192 #define omap15xx_mcbsp_pdata            NULL
 193 #define OMAP15XX_MCBSP_PDATA_SZ         0
 194 #endif
 195
 196 #ifdef CONFIG_ARCH_OMAP16XX
 197 static struct omap_mcbsp_platform_data omap16xx_mcbsp_pdata[] = {
 198         {
 199                 .phys_base      = OMAP1610_MCBSP1_BASE,
 200                 .dma_rx_sync    = OMAP_DMA_MCBSP1_RX,
 201                 .dma_tx_sync    = OMAP_DMA_MCBSP1_TX,
 202                 .rx_irq         = INT_McBSP1RX,
 203                 .tx_irq         = INT_McBSP1TX,
 204                 .ops            = &omap1_mcbsp_ops,
 205                 .clk_name       = "mcbsp_clk",
 206         },
 207         {
 208                 .phys_base      = OMAP1610_MCBSP2_BASE,
 209                 .dma_rx_sync    = OMAP_DMA_MCBSP2_RX,
 210                 .dma_tx_sync    = OMAP_DMA_MCBSP2_TX,
 211                 .rx_irq         = INT_1610_McBSP2_RX,
 212                 .tx_irq         = INT_1610_McBSP2_TX,
 213                 .ops            = &omap1_mcbsp_ops,
 214         },
 215         {
 216                 .phys_base      = OMAP1610_MCBSP3_BASE,
 217                 .dma_rx_sync    = OMAP_DMA_MCBSP3_RX,
 218                 .dma_tx_sync    = OMAP_DMA_MCBSP3_TX,
 219                 .rx_irq         = INT_McBSP3RX,
 220                 .tx_irq         = INT_McBSP3TX,
 221                 .ops            = &omap1_mcbsp_ops,
 222                 .clk_name       = "mcbsp_clk",
 223         },
 224 };
 225 #define OMAP16XX_MCBSP_PDATA_SZ         ARRAY_SIZE(omap16xx_mcbsp_pdata)
 226 #else
 227 #define omap16xx_mcbsp_pdata            NULL
 228 #define OMAP16XX_MCBSP_PDATA_SZ         0
 229 #endif
 230
 231 int __init omap1_mcbsp_init(void)
 232 {
 233         int i;
 234
 235         for (i = 0; i < omap_mcbsp_clks_size; i++) {
 236                 if (cpu_is_omap15xx() || cpu_is_omap16xx()) {
 237                         omap_mcbsp_clk_init(&omap_mcbsp_clks[i]);
 238                         clk_register(&omap_mcbsp_clks[i].clk);
 239                 }
 240         }
 241
 242         if (cpu_is_omap730())
 243                 omap_mcbsp_count = OMAP730_MCBSP_PDATA_SZ;
 244         if (cpu_is_omap15xx())
 245                 omap_mcbsp_count = OMAP15XX_MCBSP_PDATA_SZ;
 246         if (cpu_is_omap16xx())
 247                 omap_mcbsp_count = OMAP16XX_MCBSP_PDATA_SZ;
 248
 249         mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *),
 250                                                                 GFP_KERNEL);
 251         if (!mcbsp_ptr)
 252                 return -ENOMEM;
 253
 254         if (cpu_is_omap730())
 255                 omap_mcbsp_register_board_cfg(omap730_mcbsp_pdata,
 256                                                 OMAP730_MCBSP_PDATA_SZ);
 257
 258         if (cpu_is_omap15xx())
 259                 omap_mcbsp_register_board_cfg(omap15xx_mcbsp_pdata,
 260                                                 OMAP15XX_MCBSP_PDATA_SZ);
 261
 262         if (cpu_is_omap16xx())
 263                 omap_mcbsp_register_board_cfg(omap16xx_mcbsp_pdata,
 264                                                 OMAP16XX_MCBSP_PDATA_SZ);
 265
 266         return omap_mcbsp_init();
 267 }
 268
 269 arch_initcall(omap1_mcbsp_init);