release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <linux/slab.h>
  20
  21 #include <mach/irqs.h>
  22 #include <plat/dma.h>
  23 #include <plat/mux.h>
  24 #include <plat/cpu.h>
  25 #include <plat/mcbsp.h>
  26
  27 #define DPS_RSTCT2_PER_EN       (1 << 0)
  28 #define DSP_RSTCT2_WD_PER_EN    (1 << 1)
  29
  30 static int dsp_use;
  31 static struct clk *api_clk;
  32 static struct clk *dsp_clk;
  33
  34 static void omap1_mcbsp_request(unsigned int id)
  35 {
  36         /*
  37          * On 1510, 1610 and 1710, McBSP1 and McBSP3
  38          * are DSP public peripherals.
  39          */
  40         if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3) {
  41                 if (dsp_use++ == 0) {
  42                         api_clk = clk_get(NULL, "api_ck");
  43                         dsp_clk = clk_get(NULL, "dsp_ck");
  44                         if (!IS_ERR(api_clk) && !IS_ERR(dsp_clk)) {
  45                                 clk_enable(api_clk);
  46                                 clk_enable(dsp_clk);
  47
  48                                 __raw_writew(__raw_readw(DSP_RSTCT2) | DPS_RSTCT2_PER_EN |
  49                                                 DSP_RSTCT2_WD_PER_EN, DSP_RSTCT2);
  50                         }
  51                 }
  52         }
  53 }
  54
  55 static void omap1_mcbsp_free(unsigned int id)
  56 {
  57         if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3) {
  58                 if (--dsp_use == 0) {
  59                         if (!IS_ERR(api_clk)) {
  60                                 clk_disable(api_clk);
  61                                 clk_put(api_clk);
  62                         }
  63                         if (!IS_ERR(dsp_clk)) {
  64                                 clk_disable(dsp_clk);
  65                                 clk_put(dsp_clk);
  66                         }
  67                 }
  68         }
  69 }
  70
  71 static struct omap_mcbsp_ops omap1_mcbsp_ops = {
  72         .request        = omap1_mcbsp_request,
  73         .free           = omap1_mcbsp_free,
  74 };
  75
  76 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
  77 static struct omap_mcbsp_platform_data omap7xx_mcbsp_pdata[] = {
  78         {
  79                 .phys_base      = OMAP7XX_MCBSP1_BASE,
  80                 .dma_rx_sync    = OMAP_DMA_MCBSP1_RX,
  81                 .dma_tx_sync    = OMAP_DMA_MCBSP1_TX,
  82                 .rx_irq         = INT_7XX_McBSP1RX,
  83                 .tx_irq         = INT_7XX_McBSP1TX,
  84                 .ops            = &omap1_mcbsp_ops,
  85         },
  86         {
  87                 .phys_base      = OMAP7XX_MCBSP2_BASE,
  88                 .dma_rx_sync    = OMAP_DMA_MCBSP3_RX,
  89                 .dma_tx_sync    = OMAP_DMA_MCBSP3_TX,
  90                 .rx_irq         = INT_7XX_McBSP2RX,
  91                 .tx_irq         = INT_7XX_McBSP2TX,
  92                 .ops            = &omap1_mcbsp_ops,
  93         },
  94 };
  95 #define OMAP7XX_MCBSP_PDATA_SZ          ARRAY_SIZE(omap7xx_mcbsp_pdata)
  96 #define OMAP7XX_MCBSP_REG_NUM           (OMAP_MCBSP_REG_XCERH / sizeof(u16) + 1)
  97 #else
  98 #define omap7xx_mcbsp_pdata             NULL
  99 #define OMAP7XX_MCBSP_PDATA_SZ          0
 100 #define OMAP7XX_MCBSP_REG_NUM           0
 101 #endif
 102
 103 #ifdef CONFIG_ARCH_OMAP15XX
 104 static struct omap_mcbsp_platform_data omap15xx_mcbsp_pdata[] = {
 105         {
 106                 .phys_base      = OMAP1510_MCBSP1_BASE,
 107                 .dma_rx_sync    = OMAP_DMA_MCBSP1_RX,
 108                 .dma_tx_sync    = OMAP_DMA_MCBSP1_TX,
 109                 .rx_irq         = INT_McBSP1RX,
 110                 .tx_irq         = INT_McBSP1TX,
 111                 .ops            = &omap1_mcbsp_ops,
 112         },
 113         {
 114                 .phys_base      = OMAP1510_MCBSP2_BASE,
 115                 .dma_rx_sync    = OMAP_DMA_MCBSP2_RX,
 116                 .dma_tx_sync    = OMAP_DMA_MCBSP2_TX,
 117                 .rx_irq         = INT_1510_SPI_RX,
 118                 .tx_irq         = INT_1510_SPI_TX,
 119                 .ops            = &omap1_mcbsp_ops,
 120         },
 121         {
 122                 .phys_base      = OMAP1510_MCBSP3_BASE,
 123                 .dma_rx_sync    = OMAP_DMA_MCBSP3_RX,
 124                 .dma_tx_sync    = OMAP_DMA_MCBSP3_TX,
 125                 .rx_irq         = INT_McBSP3RX,
 126                 .tx_irq         = INT_McBSP3TX,
 127                 .ops            = &omap1_mcbsp_ops,
 128         },
 129 };
 130 #define OMAP15XX_MCBSP_PDATA_SZ         ARRAY_SIZE(omap15xx_mcbsp_pdata)
 131 #define OMAP15XX_MCBSP_REG_NUM          (OMAP_MCBSP_REG_XCERH / sizeof(u16) + 1)
 132 #else
 133 #define omap15xx_mcbsp_pdata            NULL
 134 #define OMAP15XX_MCBSP_PDATA_SZ         0
 135 #define OMAP15XX_MCBSP_REG_NUM          0
 136 #endif
 137
 138 #ifdef CONFIG_ARCH_OMAP16XX
 139 static struct omap_mcbsp_platform_data omap16xx_mcbsp_pdata[] = {
 140         {
 141                 .phys_base      = OMAP1610_MCBSP1_BASE,
 142                 .dma_rx_sync    = OMAP_DMA_MCBSP1_RX,
 143                 .dma_tx_sync    = OMAP_DMA_MCBSP1_TX,
 144                 .rx_irq         = INT_McBSP1RX,
 145                 .tx_irq         = INT_McBSP1TX,
 146                 .ops            = &omap1_mcbsp_ops,
 147         },
 148         {
 149                 .phys_base      = OMAP1610_MCBSP2_BASE,
 150                 .dma_rx_sync    = OMAP_DMA_MCBSP2_RX,
 151                 .dma_tx_sync    = OMAP_DMA_MCBSP2_TX,
 152                 .rx_irq         = INT_1610_McBSP2_RX,
 153                 .tx_irq         = INT_1610_McBSP2_TX,
 154                 .ops            = &omap1_mcbsp_ops,
 155         },
 156         {
 157                 .phys_base      = OMAP1610_MCBSP3_BASE,
 158                 .dma_rx_sync    = OMAP_DMA_MCBSP3_RX,
 159                 .dma_tx_sync    = OMAP_DMA_MCBSP3_TX,
 160                 .rx_irq         = INT_McBSP3RX,
 161                 .tx_irq         = INT_McBSP3TX,
 162                 .ops            = &omap1_mcbsp_ops,
 163         },
 164 };
 165 #define OMAP16XX_MCBSP_PDATA_SZ         ARRAY_SIZE(omap16xx_mcbsp_pdata)
 166 #define OMAP16XX_MCBSP_REG_NUM          (OMAP_MCBSP_REG_XCERH / sizeof(u16) + 1)
 167 #else
 168 #define omap16xx_mcbsp_pdata            NULL
 169 #define OMAP16XX_MCBSP_PDATA_SZ         0
 170 #define OMAP16XX_MCBSP_REG_NUM          0
 171 #endif
 172
 173 int __init omap1_mcbsp_init(void)
 174 {
 175         if (cpu_is_omap7xx()) {
 176                 omap_mcbsp_count = OMAP7XX_MCBSP_PDATA_SZ;
 177                 omap_mcbsp_cache_size = OMAP7XX_MCBSP_REG_NUM * sizeof(u16);
 178         } else if (cpu_is_omap15xx()) {
 179                 omap_mcbsp_count = OMAP15XX_MCBSP_PDATA_SZ;
 180                 omap_mcbsp_cache_size = OMAP15XX_MCBSP_REG_NUM * sizeof(u16);
 181         } else if (cpu_is_omap16xx()) {
 182                 omap_mcbsp_count = OMAP16XX_MCBSP_PDATA_SZ;
 183                 omap_mcbsp_cache_size = OMAP16XX_MCBSP_REG_NUM * sizeof(u16);
 184         }
 185
 186         mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *),
 187                                                                 GFP_KERNEL);
 188         if (!mcbsp_ptr)
 189                 return -ENOMEM;
 190
 191         if (cpu_is_omap7xx())
 192                 omap_mcbsp_register_board_cfg(omap7xx_mcbsp_pdata,
 193                                                 OMAP7XX_MCBSP_PDATA_SZ);
 194
 195         if (cpu_is_omap15xx())
 196                 omap_mcbsp_register_board_cfg(omap15xx_mcbsp_pdata,
 197                                                 OMAP15XX_MCBSP_PDATA_SZ);
 198
 199         if (cpu_is_omap16xx())
 200                 omap_mcbsp_register_board_cfg(omap16xx_mcbsp_pdata,
 201                                                 OMAP16XX_MCBSP_PDATA_SZ);
 202
 203         return omap_mcbsp_init();
 204 }
 205
 206 arch_initcall(omap1_mcbsp_init);