arch/arm/mach-omap1/mcbsp.c

   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/dma.h>
  21 #include <mach/mux.h>
  22 #include <mach/cpu.h>
  23 #include <mach/mcbsp.h>
  24 #include <mach/dsp_common.h>
  25
  26 #define DPS_RSTCT2_PER_EN       (1 << 0)
  27 #define DSP_RSTCT2_WD_PER_EN    (1 << 1)
  28
  29 struct mcbsp_internal_clk {
  30         struct clk clk;
  31         struct clk **childs;
  32         int n_childs;
  33 };
  34
  35 #if defined(CONFIG_ARCH_OMAP15XX) || defined(CONFIG_ARCH_OMAP16XX)
  36 static void omap_mcbsp_clk_init(struct mcbsp_internal_clk *mclk)
  37 {
  38         const char *clk_names[] = { "dsp_ck", "api_ck", "dspxor_ck" };
  39         int i;
  40
  41         mclk->n_childs = ARRAY_SIZE(clk_names);
  42         mclk->childs = kzalloc(mclk->n_childs * sizeof(struct clk *),
  43                                 GFP_KERNEL);
  44
  45         for (i = 0; i < mclk->n_childs; i++) {
  46                 /* We fake a platform device to get correct device id */
  47                 struct platform_device pdev;
  48
  49                 pdev.dev.bus = &platform_bus_type;
  50                 pdev.id = mclk->clk.id;
  51                 mclk->childs[i] = clk_get(&pdev.dev, clk_names[i]);
  52                 if (IS_ERR(mclk->childs[i]))
  53                         printk(KERN_ERR "Could not get clock %s (%d).\n",
  54                                 clk_names[i], mclk->clk.id);
  55         }
  56 }
  57
  58 static int omap_mcbsp_clk_enable(struct clk *clk)
  59 {
  60         struct mcbsp_internal_clk *mclk = container_of(clk,
  61                                         struct mcbsp_internal_clk, clk);
  62         int i;
  63
  64         for (i = 0; i < mclk->n_childs; i++)
  65                 clk_enable(mclk->childs[i]);
  66         return 0;
  67 }
  68
  69 static void omap_mcbsp_clk_disable(struct clk *clk)
  70 {
  71         struct mcbsp_internal_clk *mclk = container_of(clk,
  72                                         struct mcbsp_internal_clk, clk);
  73         int i;
  74
  75         for (i = 0; i < mclk->n_childs; i++)
  76                 clk_disable(mclk->childs[i]);
  77 }
  78
  79 static struct mcbsp_internal_clk omap_mcbsp_clks[] = {
  80         {
  81                 .clk = {
  82                         .name           = "mcbsp_clk",
  83                         .id             = 1,
  84                         .enable         = omap_mcbsp_clk_enable,
  85                         .disable        = omap_mcbsp_clk_disable,
  86                 },
  87         },
  88         {
  89                 .clk = {
  90                         .name           = "mcbsp_clk",
  91                         .id             = 3,
  92                         .enable         = omap_mcbsp_clk_enable,
  93                         .disable        = omap_mcbsp_clk_disable,
  94                 },
  95         },
  96 };
  97
  98 #define omap_mcbsp_clks_size    ARRAY_SIZE(omap_mcbsp_clks)
  99 #else
 100 #define omap_mcbsp_clks_size    0
 101 static struct mcbsp_internal_clk __initdata *omap_mcbsp_clks;
 102 static inline void omap_mcbsp_clk_init(struct mcbsp_internal_clk *mclk)
 103 { }
 104 #endif
 105
 106 static int omap1_mcbsp_check(unsigned int id)
 107 {
 108         /* REVISIT: Check correctly for number of registered McBSPs */
 109         if (cpu_is_omap730()) {
 110                 if (id > OMAP_MAX_MCBSP_COUNT - 2) {
 111                        printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n",
 112                                 id + 1);
 113                        return -ENODEV;
 114                 }
 115                 return 0;
 116         }
 117
 118         if (cpu_is_omap15xx() || cpu_is_omap16xx()) {
 119                 if (id > OMAP_MAX_MCBSP_COUNT - 1) {
 120                         printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n",
 121                                 id + 1);
 122                         return -ENODEV;
 123                 }
 124                 return 0;
 125         }
 126
 127         return -ENODEV;
 128 }
 129
 130 static void omap1_mcbsp_request(unsigned int id)
 131 {
 132         /*
 133          * On 1510, 1610 and 1710, McBSP1 and McBSP3
 134          * are DSP public peripherals.
 135          */
 136         if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3) {
 137                 omap_dsp_request_mem();
 138                 /*
 139                  * DSP external peripheral reset
 140                  * FIXME: This should be moved to dsp code
 141                  */
 142                 __raw_writew(__raw_readw(DSP_RSTCT2) | DPS_RSTCT2_PER_EN |
 143                                 DSP_RSTCT2_WD_PER_EN, DSP_RSTCT2);
 144         }
 145 }
 146
 147 static void omap1_mcbsp_free(unsigned int id)
 148 {
 149         if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3)
 150                 omap_dsp_release_mem();
 151 }
 152
 153 static struct omap_mcbsp_ops omap1_mcbsp_ops = {
 154         .check          = omap1_mcbsp_check,
 155         .request        = omap1_mcbsp_request,
 156         .free           = omap1_mcbsp_free,
 157 };
 158
 159 #ifdef CONFIG_ARCH_OMAP730
 160 static struct omap_mcbsp_platform_data omap730_mcbsp_pdata[] = {
 161         {
 162                 .virt_base      = io_p2v(OMAP730_MCBSP1_BASE),
 163                 .dma_rx_sync    = OMAP_DMA_MCBSP1_RX,
 164                 .dma_tx_sync    = OMAP_DMA_MCBSP1_TX,
 165                 .rx_irq         = INT_730_McBSP1RX,
 166                 .tx_irq         = INT_730_McBSP1TX,
 167                 .ops            = &omap1_mcbsp_ops,
 168         },
 169         {
 170                 .virt_base      = io_p2v(OMAP730_MCBSP2_BASE),
 171                 .dma_rx_sync    = OMAP_DMA_MCBSP3_RX,
 172                 .dma_tx_sync    = OMAP_DMA_MCBSP3_TX,
 173                 .rx_irq         = INT_730_McBSP2RX,
 174                 .tx_irq         = INT_730_McBSP2TX,
 175                 .ops            = &omap1_mcbsp_ops,
 176         },
 177 };
 178 #define OMAP730_MCBSP_PDATA_SZ          ARRAY_SIZE(omap730_mcbsp_pdata)
 179 #else
 180 #define omap730_mcbsp_pdata             NULL
 181 #define OMAP730_MCBSP_PDATA_SZ          0
 182 #endif
 183
 184 #ifdef CONFIG_ARCH_OMAP15XX
 185 static struct omap_mcbsp_platform_data omap15xx_mcbsp_pdata[] = {
 186         {
 187                 .virt_base      = OMAP1510_MCBSP1_BASE,
 188                 .dma_rx_sync    = OMAP_DMA_MCBSP1_RX,
 189                 .dma_tx_sync    = OMAP_DMA_MCBSP1_TX,
 190                 .rx_irq         = INT_McBSP1RX,
 191                 .tx_irq         = INT_McBSP1TX,
 192                 .ops            = &omap1_mcbsp_ops,
 193                 .clk_name       = "mcbsp_clk",
 194                 },
 195         {
 196                 .virt_base      = io_p2v(OMAP1510_MCBSP2_BASE),
 197                 .dma_rx_sync    = OMAP_DMA_MCBSP2_RX,
 198                 .dma_tx_sync    = OMAP_DMA_MCBSP2_TX,
 199                 .rx_irq         = INT_1510_SPI_RX,
 200                 .tx_irq         = INT_1510_SPI_TX,
 201                 .ops            = &omap1_mcbsp_ops,
 202         },
 203         {
 204                 .virt_base      = OMAP1510_MCBSP3_BASE,
 205                 .dma_rx_sync    = OMAP_DMA_MCBSP3_RX,
 206                 .dma_tx_sync    = OMAP_DMA_MCBSP3_TX,
 207                 .rx_irq         = INT_McBSP3RX,
 208                 .tx_irq         = INT_McBSP3TX,
 209                 .ops            = &omap1_mcbsp_ops,
 210                 .clk_name       = "mcbsp_clk",
 211         },
 212 };
 213 #define OMAP15XX_MCBSP_PDATA_SZ         ARRAY_SIZE(omap15xx_mcbsp_pdata)
 214 #else
 215 #define omap15xx_mcbsp_pdata            NULL
 216 #define OMAP15XX_MCBSP_PDATA_SZ         0
 217 #endif
 218
 219 #ifdef CONFIG_ARCH_OMAP16XX
 220 static struct omap_mcbsp_platform_data omap16xx_mcbsp_pdata[] = {
 221         {
 222                 .virt_base      = OMAP1610_MCBSP1_BASE,
 223                 .dma_rx_sync    = OMAP_DMA_MCBSP1_RX,
 224                 .dma_tx_sync    = OMAP_DMA_MCBSP1_TX,
 225                 .rx_irq         = INT_McBSP1RX,
 226                 .tx_irq         = INT_McBSP1TX,
 227                 .ops            = &omap1_mcbsp_ops,
 228                 .clk_name       = "mcbsp_clk",
 229         },
 230         {
 231                 .virt_base      = io_p2v(OMAP1610_MCBSP2_BASE),
 232                 .dma_rx_sync    = OMAP_DMA_MCBSP2_RX,
 233                 .dma_tx_sync    = OMAP_DMA_MCBSP2_TX,
 234                 .rx_irq         = INT_1610_McBSP2_RX,
 235                 .tx_irq         = INT_1610_McBSP2_TX,
 236                 .ops            = &omap1_mcbsp_ops,
 237         },
 238         {
 239                 .virt_base      = OMAP1610_MCBSP3_BASE,
 240                 .dma_rx_sync    = OMAP_DMA_MCBSP3_RX,
 241                 .dma_tx_sync    = OMAP_DMA_MCBSP3_TX,
 242                 .rx_irq         = INT_McBSP3RX,
 243                 .tx_irq         = INT_McBSP3TX,
 244                 .ops            = &omap1_mcbsp_ops,
 245                 .clk_name       = "mcbsp_clk",
 246         },
 247 };
 248 #define OMAP16XX_MCBSP_PDATA_SZ         ARRAY_SIZE(omap16xx_mcbsp_pdata)
 249 #else
 250 #define omap16xx_mcbsp_pdata            NULL
 251 #define OMAP16XX_MCBSP_PDATA_SZ         0
 252 #endif
 253
 254 int __init omap1_mcbsp_init(void)
 255 {
 256         int i;
 257
 258         for (i = 0; i < omap_mcbsp_clks_size; i++) {
 259                 if (cpu_is_omap15xx() || cpu_is_omap16xx()) {
 260                         omap_mcbsp_clk_init(&omap_mcbsp_clks[i]);
 261                         clk_register(&omap_mcbsp_clks[i].clk);
 262                 }
 263         }
 264
 265         if (cpu_is_omap730())
 266                 omap_mcbsp_register_board_cfg(omap730_mcbsp_pdata,
 267                                                 OMAP730_MCBSP_PDATA_SZ);
 268
 269         if (cpu_is_omap15xx())
 270                 omap_mcbsp_register_board_cfg(omap15xx_mcbsp_pdata,
 271                                                 OMAP15XX_MCBSP_PDATA_SZ);
 272
 273         if (cpu_is_omap16xx())
 274                 omap_mcbsp_register_board_cfg(omap16xx_mcbsp_pdata,
 275                                                 OMAP16XX_MCBSP_PDATA_SZ);
 276
 277         return omap_mcbsp_init();
 278 }
 279
 280 arch_initcall(omap1_mcbsp_init);