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mcbsp.c

/*
 * linux/arch/arm/mach-omap2/mcbsp.c
 *
 * Copyright (C) 2008 Instituto Nokia de Tecnologia
 * Contact: Eduardo Valentin <eduardo.valentin@indt.org.br>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Multichannel mode not supported.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>

#include <mach/dma.h>
#include <mach/mux.h>
#include <mach/cpu.h>
#include <mach/mcbsp.h>

struct mcbsp_internal_clk {
      struct clk clk;
      struct clk **childs;
      int n_childs;
};

#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
static void omap_mcbsp_clk_init(struct mcbsp_internal_clk *mclk)
{
      const char *clk_names[] = { "mcbsp_ick", "mcbsp_fck" };
      int i;

      mclk->n_childs = ARRAY_SIZE(clk_names);
      mclk->childs = kzalloc(mclk->n_childs * sizeof(struct clk *),
                        GFP_KERNEL);

      for (i = 0; i < mclk->n_childs; i++) {
            /* We fake a platform device to get correct device id */
            struct platform_device pdev;

            pdev.dev.bus = &platform_bus_type;
            pdev.id = mclk->clk.id;
            mclk->childs[i] = clk_get(&pdev.dev, clk_names[i]);
            if (IS_ERR(mclk->childs[i]))
                  printk(KERN_ERR "Could not get clock %s (%d).\n",
                        clk_names[i], mclk->clk.id);
      }
}

static int omap_mcbsp_clk_enable(struct clk *clk)
{
      struct mcbsp_internal_clk *mclk = container_of(clk,
                              struct mcbsp_internal_clk, clk);
      int i;

      for (i = 0; i < mclk->n_childs; i++)
            clk_enable(mclk->childs[i]);
      return 0;
}

static void omap_mcbsp_clk_disable(struct clk *clk)
{
      struct mcbsp_internal_clk *mclk = container_of(clk,
                              struct mcbsp_internal_clk, clk);
      int i;

      for (i = 0; i < mclk->n_childs; i++)
            clk_disable(mclk->childs[i]);
}

static struct mcbsp_internal_clk omap_mcbsp_clks[] = {
      {
            .clk = {
                  .name             = "mcbsp_clk",
                  .id         = 1,
                  .enable           = omap_mcbsp_clk_enable,
                  .disable    = omap_mcbsp_clk_disable,
            },
      },
      {
            .clk = {
                  .name             = "mcbsp_clk",
                  .id         = 2,
                  .enable           = omap_mcbsp_clk_enable,
                  .disable    = omap_mcbsp_clk_disable,
            },
      },
};

#define omap_mcbsp_clks_size  ARRAY_SIZE(omap_mcbsp_clks)
#else
#define omap_mcbsp_clks_size  0
static struct mcbsp_internal_clk __initdata *omap_mcbsp_clks;
static inline void omap_mcbsp_clk_init(struct clk *clk)
{ }
#endif

static void omap2_mcbsp2_mux_setup(void)
{
      omap_cfg_reg(Y15_24XX_MCBSP2_CLKX);
      omap_cfg_reg(R14_24XX_MCBSP2_FSX);
      omap_cfg_reg(W15_24XX_MCBSP2_DR);
      omap_cfg_reg(V15_24XX_MCBSP2_DX);
      omap_cfg_reg(V14_24XX_GPIO117);
      /*
       * TODO: Need to add MUX settings for OMAP 2430 SDP
       */
}

static void omap2_mcbsp_request(unsigned int id)
{
      if (cpu_is_omap2420() && (id == OMAP_MCBSP2))
            omap2_mcbsp2_mux_setup();
}

static int omap2_mcbsp_check(unsigned int id)
{
      if (id > OMAP_MAX_MCBSP_COUNT - 1) {
            printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1);
            return -ENODEV;
      }
      return 0;
}

static struct omap_mcbsp_ops omap2_mcbsp_ops = {
      .request    = omap2_mcbsp_request,
      .check            = omap2_mcbsp_check,
};

#ifdef CONFIG_ARCH_OMAP24XX
static struct omap_mcbsp_platform_data omap24xx_mcbsp_pdata[] = {
      {
            .phys_base  = OMAP24XX_MCBSP1_BASE,
            .virt_base  = IO_ADDRESS(OMAP24XX_MCBSP1_BASE),
            .dma_rx_sync      = OMAP24XX_DMA_MCBSP1_RX,
            .dma_tx_sync      = OMAP24XX_DMA_MCBSP1_TX,
            .rx_irq           = INT_24XX_MCBSP1_IRQ_RX,
            .tx_irq           = INT_24XX_MCBSP1_IRQ_TX,
            .ops        = &omap2_mcbsp_ops,
            .clk_name   = "mcbsp_clk",
      },
      {
            .phys_base  = OMAP24XX_MCBSP2_BASE,
            .virt_base  = IO_ADDRESS(OMAP24XX_MCBSP2_BASE),
            .dma_rx_sync      = OMAP24XX_DMA_MCBSP2_RX,
            .dma_tx_sync      = OMAP24XX_DMA_MCBSP2_TX,
            .rx_irq           = INT_24XX_MCBSP2_IRQ_RX,
            .tx_irq           = INT_24XX_MCBSP2_IRQ_TX,
            .ops        = &omap2_mcbsp_ops,
            .clk_name   = "mcbsp_clk",
      },
};
#define OMAP24XX_MCBSP_PDATA_SZ           ARRAY_SIZE(omap24xx_mcbsp_pdata)
#else
#define omap24xx_mcbsp_pdata        NULL
#define OMAP24XX_MCBSP_PDATA_SZ           0
#endif

#ifdef CONFIG_ARCH_OMAP34XX
static struct omap_mcbsp_platform_data omap34xx_mcbsp_pdata[] = {
      {
            .phys_base  = OMAP34XX_MCBSP1_BASE,
            .virt_base  = IO_ADDRESS(OMAP34XX_MCBSP1_BASE),
            .dma_rx_sync      = OMAP24XX_DMA_MCBSP1_RX,
            .dma_tx_sync      = OMAP24XX_DMA_MCBSP1_TX,
            .rx_irq           = INT_24XX_MCBSP1_IRQ_RX,
            .tx_irq           = INT_24XX_MCBSP1_IRQ_TX,
            .ops        = &omap2_mcbsp_ops,
            .clk_name   = "mcbsp_clk",
      },
      {
            .phys_base  = OMAP34XX_MCBSP2_BASE,
            .virt_base  = IO_ADDRESS(OMAP34XX_MCBSP2_BASE),
            .dma_rx_sync      = OMAP24XX_DMA_MCBSP2_RX,
            .dma_tx_sync      = OMAP24XX_DMA_MCBSP2_TX,
            .rx_irq           = INT_24XX_MCBSP2_IRQ_RX,
            .tx_irq           = INT_24XX_MCBSP2_IRQ_TX,
            .ops        = &omap2_mcbsp_ops,
            .clk_name   = "mcbsp_clk",
      },
};
#define OMAP34XX_MCBSP_PDATA_SZ           ARRAY_SIZE(omap34xx_mcbsp_pdata)
#else
#define omap34xx_mcbsp_pdata        NULL
#define OMAP34XX_MCBSP_PDATA_SZ           0
#endif

int __init omap2_mcbsp_init(void)
{
      int i;

      for (i = 0; i < omap_mcbsp_clks_size; i++) {
            /* Once we call clk_get inside init, we do not register it */
            omap_mcbsp_clk_init(&omap_mcbsp_clks[i]);
            clk_register(&omap_mcbsp_clks[i].clk);
      }

      if (cpu_is_omap24xx())
            omap_mcbsp_register_board_cfg(omap24xx_mcbsp_pdata,
                                    OMAP24XX_MCBSP_PDATA_SZ);

      if (cpu_is_omap34xx())
            omap_mcbsp_register_board_cfg(omap34xx_mcbsp_pdata,
                                    OMAP34XX_MCBSP_PDATA_SZ);

      return omap_mcbsp_init();
}
arch_initcall(omap2_mcbsp_init);

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