arch/arm/mach-omap2/am35xx-emac.c

   1 /*
   2  * Copyright (C) 2011 Ilya Yanok, Emcraft Systems
   3  *
   4  * Based on mach-omap2/board-am3517evm.c
   5  * Copyright (C) 2009 Texas Instruments Incorporated
   6  * Author: Ranjith Lohithakshan <ranjithl@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  13  * whether express or implied; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include <linux/err.h>
  19 #include <linux/davinci_emac.h>
  20 #include <asm/system.h>
  21 #include "omap_device.h"
  22 #include "am35xx.h"
  23 #include "control.h"
  24 #include "am35xx-emac.h"
  25
  26 static void am35xx_enable_emac_int(void)
  27 {
  28         u32 v;
  29
  30         v = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
  31         v |= (AM35XX_CPGMAC_C0_RX_PULSE_CLR | AM35XX_CPGMAC_C0_TX_PULSE_CLR |
  32               AM35XX_CPGMAC_C0_MISC_PULSE_CLR | AM35XX_CPGMAC_C0_RX_THRESH_CLR);
  33         omap_ctrl_writel(v, AM35XX_CONTROL_LVL_INTR_CLEAR);
  34         omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR); /* OCP barrier */
  35 }
  36
  37 static void am35xx_disable_emac_int(void)
  38 {
  39         u32 v;
  40
  41         v = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
  42         v |= (AM35XX_CPGMAC_C0_RX_PULSE_CLR | AM35XX_CPGMAC_C0_TX_PULSE_CLR);
  43         omap_ctrl_writel(v, AM35XX_CONTROL_LVL_INTR_CLEAR);
  44         omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR); /* OCP barrier */
  45 }
  46
  47 static struct emac_platform_data am35xx_emac_pdata = {
  48         .ctrl_reg_offset        = AM35XX_EMAC_CNTRL_OFFSET,
  49         .ctrl_mod_reg_offset    = AM35XX_EMAC_CNTRL_MOD_OFFSET,
  50         .ctrl_ram_offset        = AM35XX_EMAC_CNTRL_RAM_OFFSET,
  51         .ctrl_ram_size          = AM35XX_EMAC_CNTRL_RAM_SIZE,
  52         .hw_ram_addr            = AM35XX_EMAC_HW_RAM_ADDR,
  53         .version                = EMAC_VERSION_2,
  54         .interrupt_enable       = am35xx_enable_emac_int,
  55         .interrupt_disable      = am35xx_disable_emac_int,
  56 };
  57
  58 static struct mdio_platform_data am35xx_mdio_pdata;
  59
  60 static int __init omap_davinci_emac_dev_init(struct omap_hwmod *oh,
  61                 void *pdata, int pdata_len)
  62 {
  63         struct platform_device *pdev;
  64
  65         pdev = omap_device_build(oh->class->name, 0, oh, pdata, pdata_len);
  66         if (IS_ERR(pdev)) {
  67                 WARN(1, "Can't build omap_device for %s:%s.\n",
  68                      oh->class->name, oh->name);
  69                 return PTR_ERR(pdev);
  70         }
  71
  72         return 0;
  73 }
  74
  75 void __init am35xx_emac_init(unsigned long mdio_bus_freq, u8 rmii_en)
  76 {
  77         struct omap_hwmod *oh;
  78         u32 v;
  79         int ret;
  80
  81         oh = omap_hwmod_lookup("davinci_mdio");
  82         if (!oh) {
  83                 pr_err("Could not find davinci_mdio hwmod\n");
  84                 return;
  85         }
  86
  87         am35xx_mdio_pdata.bus_freq = mdio_bus_freq;
  88
  89         ret = omap_davinci_emac_dev_init(oh, &am35xx_mdio_pdata,
  90                                          sizeof(am35xx_mdio_pdata));
  91         if (ret) {
  92                 pr_err("Could not build davinci_mdio hwmod device\n");
  93                 return;
  94         }
  95
  96         oh = omap_hwmod_lookup("davinci_emac");
  97         if (!oh) {
  98                 pr_err("Could not find davinci_emac hwmod\n");
  99                 return;
 100         }
 101
 102         am35xx_emac_pdata.rmii_en = rmii_en;
 103
 104         ret = omap_davinci_emac_dev_init(oh, &am35xx_emac_pdata,
 105                                          sizeof(am35xx_emac_pdata));
 106         if (ret) {
 107                 pr_err("Could not build davinci_emac hwmod device\n");
 108                 return;
 109         }
 110
 111         v = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
 112         v &= ~AM35XX_CPGMACSS_SW_RST;
 113         omap_ctrl_writel(v, AM35XX_CONTROL_IP_SW_RESET);
 114         omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET); /* OCP barrier */
 115 }