arch/arm/mach-omap2/mcbsp.c

   1 /*
   2  * linux/arch/arm/mach-omap2/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 <asm/arch/dma.h>
  21 #include <asm/arch/mux.h>
  22 #include <asm/arch/cpu.h>
  23 #include <asm/arch/mcbsp.h>
  24
  25 struct mcbsp_internal_clk {
  26         struct clk clk;
  27         struct clk **childs;
  28         int n_childs;
  29 };
  30
  31 #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
  32 static void omap_mcbsp_clk_init(struct mcbsp_internal_clk *mclk)
  33 {
  34         const char *clk_names[] = { "mcbsp_ick", "mcbsp_fck" };
  35         int i;
  36
  37         mclk->n_childs = ARRAY_SIZE(clk_names);
  38         mclk->childs = kzalloc(mclk->n_childs * sizeof(struct clk *),
  39                                 GFP_KERNEL);
  40
  41         for (i = 0; i < mclk->n_childs; i++) {
  42                 /* We fake a platform device to get correct device id */
  43                 struct platform_device pdev;
  44
  45                 pdev.dev.bus = &platform_bus_type;
  46                 pdev.id = mclk->clk.id;
  47                 mclk->childs[i] = clk_get(&pdev.dev, clk_names[i]);
  48                 if (IS_ERR(mclk->childs[i]))
  49                         printk(KERN_ERR "Could not get clock %s (%d).\n",
  50                                 clk_names[i], mclk->clk.id);
  51         }
  52 }
  53
  54 static int omap_mcbsp_clk_enable(struct clk *clk)
  55 {
  56         struct mcbsp_internal_clk *mclk = container_of(clk,
  57                                         struct mcbsp_internal_clk, clk);
  58         int i;
  59
  60         for (i = 0; i < mclk->n_childs; i++)
  61                 clk_enable(mclk->childs[i]);
  62         return 0;
  63 }
  64
  65 static void omap_mcbsp_clk_disable(struct clk *clk)
  66 {
  67         struct mcbsp_internal_clk *mclk = container_of(clk,
  68                                         struct mcbsp_internal_clk, clk);
  69         int i;
  70
  71         for (i = 0; i < mclk->n_childs; i++)
  72                 clk_disable(mclk->childs[i]);
  73 }
  74
  75 static struct mcbsp_internal_clk omap_mcbsp_clks[] = {
  76         {
  77                 .clk = {
  78                         .name           = "mcbsp_clk",
  79                         .id             = 1,
  80                         .enable         = omap_mcbsp_clk_enable,
  81                         .disable        = omap_mcbsp_clk_disable,
  82                 },
  83         },
  84         {
  85                 .clk = {
  86                         .name           = "mcbsp_clk",
  87                         .id             = 2,
  88                         .enable         = omap_mcbsp_clk_enable,
  89                         .disable        = omap_mcbsp_clk_disable,
  90                 },
  91         },
  92 };
  93
  94 #define omap_mcbsp_clks_size    ARRAY_SIZE(omap_mcbsp_clks)
  95 #else
  96 #define omap_mcbsp_clks_size    0
  97 static struct mcbsp_internal_clk __initdata *omap_mcbsp_clks;
  98 static inline void omap_mcbsp_clk_init(struct clk *clk)
  99 { }
 100 #endif
 101
 102 static void omap2_mcbsp2_mux_setup(void)
 103 {
 104         omap_cfg_reg(Y15_24XX_MCBSP2_CLKX);
 105         omap_cfg_reg(R14_24XX_MCBSP2_FSX);
 106         omap_cfg_reg(W15_24XX_MCBSP2_DR);
 107         omap_cfg_reg(V15_24XX_MCBSP2_DX);
 108         omap_cfg_reg(V14_24XX_GPIO117);
 109         /*
 110          * TODO: Need to add MUX settings for OMAP 2430 SDP
 111          */
 112 }
 113
 114 static void omap2_mcbsp_request(unsigned int id)
 115 {
 116         if (cpu_is_omap2420() && (id == OMAP_MCBSP2))
 117                 omap2_mcbsp2_mux_setup();
 118 }
 119
 120 static int omap2_mcbsp_check(unsigned int id)
 121 {
 122         if (id > OMAP_MAX_MCBSP_COUNT - 1) {
 123                 printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1);
 124                 return -ENODEV;
 125         }
 126         return 0;
 127 }
 128
 129 static struct omap_mcbsp_ops omap2_mcbsp_ops = {
 130         .request        = omap2_mcbsp_request,
 131         .check          = omap2_mcbsp_check,
 132 };
 133
 134 #ifdef CONFIG_ARCH_OMAP24XX
 135 static struct omap_mcbsp_platform_data omap24xx_mcbsp_pdata[] = {
 136         {
 137                 .virt_base      = IO_ADDRESS(OMAP24XX_MCBSP1_BASE),
 138                 .dma_rx_sync    = OMAP24XX_DMA_MCBSP1_RX,
 139                 .dma_tx_sync    = OMAP24XX_DMA_MCBSP1_TX,
 140                 .rx_irq         = INT_24XX_MCBSP1_IRQ_RX,
 141                 .tx_irq         = INT_24XX_MCBSP1_IRQ_TX,
 142                 .ops            = &omap2_mcbsp_ops,
 143                 .clk_name       = "mcbsp_clk",
 144         },
 145         {
 146                 .virt_base      = IO_ADDRESS(OMAP24XX_MCBSP2_BASE),
 147                 .dma_rx_sync    = OMAP24XX_DMA_MCBSP2_RX,
 148                 .dma_tx_sync    = OMAP24XX_DMA_MCBSP2_TX,
 149                 .rx_irq         = INT_24XX_MCBSP2_IRQ_RX,
 150                 .tx_irq         = INT_24XX_MCBSP2_IRQ_TX,
 151                 .ops            = &omap2_mcbsp_ops,
 152                 .clk_name       = "mcbsp_clk",
 153         },
 154 };
 155 #define OMAP24XX_MCBSP_PDATA_SZ         ARRAY_SIZE(omap24xx_mcbsp_pdata)
 156 #else
 157 #define omap24xx_mcbsp_pdata            NULL
 158 #define OMAP24XX_MCBSP_PDATA_SZ         0
 159 #endif
 160
 161 #ifdef CONFIG_ARCH_OMAP34XX
 162 static struct omap_mcbsp_platform_data omap34xx_mcbsp_pdata[] = {
 163         {
 164                 .virt_base      = IO_ADDRESS(OMAP34XX_MCBSP1_BASE),
 165                 .dma_rx_sync    = OMAP24XX_DMA_MCBSP1_RX,
 166                 .dma_tx_sync    = OMAP24XX_DMA_MCBSP1_TX,
 167                 .rx_irq         = INT_24XX_MCBSP1_IRQ_RX,
 168                 .tx_irq         = INT_24XX_MCBSP1_IRQ_TX,
 169                 .ops            = &omap2_mcbsp_ops,
 170                 .clk_name       = "mcbsp_clk",
 171         },
 172         {
 173                 .virt_base      = IO_ADDRESS(OMAP34XX_MCBSP2_BASE),
 174                 .dma_rx_sync    = OMAP24XX_DMA_MCBSP2_RX,
 175                 .dma_tx_sync    = OMAP24XX_DMA_MCBSP2_TX,
 176                 .rx_irq         = INT_24XX_MCBSP2_IRQ_RX,
 177                 .tx_irq         = INT_24XX_MCBSP2_IRQ_TX,
 178                 .ops            = &omap2_mcbsp_ops,
 179                 .clk_name       = "mcbsp_clk",
 180         },
 181 };
 182 #define OMAP34XX_MCBSP_PDATA_SZ         ARRAY_SIZE(omap34xx_mcbsp_pdata)
 183 #else
 184 #define omap34xx_mcbsp_pdata            NULL
 185 #define OMAP34XX_MCBSP_PDATA_SZ         0
 186 #endif
 187
 188 int __init omap2_mcbsp_init(void)
 189 {
 190         int i;
 191
 192         for (i = 0; i < omap_mcbsp_clks_size; i++) {
 193                 /* Once we call clk_get inside init, we do not register it */
 194                 omap_mcbsp_clk_init(&omap_mcbsp_clks[i]);
 195                 clk_register(&omap_mcbsp_clks[i].clk);
 196         }
 197
 198         if (cpu_is_omap24xx())
 199                 omap_mcbsp_register_board_cfg(omap24xx_mcbsp_pdata,
 200                                                 OMAP24XX_MCBSP_PDATA_SZ);
 201
 202         if (cpu_is_omap34xx())
 203                 omap_mcbsp_register_board_cfg(omap34xx_mcbsp_pdata,
 204                                                 OMAP34XX_MCBSP_PDATA_SZ);
 205
 206         return omap_mcbsp_init();
 207 }
 208 arch_initcall(omap2_mcbsp_init);