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 "omap_device.h"
  21 #include "am35xx.h"
  22 #include "control.h"
  23 #include "am35xx-emac.h"
  24
  25 static void am35xx_enable_emac_int(void)
  26 {
  27         u32 v;
  28
  29         v = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
  30         v |= (AM35XX_CPGMAC_C0_RX_PULSE_CLR | AM35XX_CPGMAC_C0_TX_PULSE_CLR |
  31               AM35XX_CPGMAC_C0_MISC_PULSE_CLR | AM35XX_CPGMAC_C0_RX_THRESH_CLR);
  32         omap_ctrl_writel(v, AM35XX_CONTROL_LVL_INTR_CLEAR);
  33         omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR); /* OCP barrier */
  34 }
  35
  36 static void am35xx_disable_emac_int(void)
  37 {
  38         u32 v;
  39
  40         v = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
  41         v |= (AM35XX_CPGMAC_C0_RX_PULSE_CLR | AM35XX_CPGMAC_C0_TX_PULSE_CLR);
  42         omap_ctrl_writel(v, AM35XX_CONTROL_LVL_INTR_CLEAR);
  43         omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR); /* OCP barrier */
  44 }
  45
  46 static struct emac_platform_data am35xx_emac_pdata = {
  47         .ctrl_reg_offset        = AM35XX_EMAC_CNTRL_OFFSET,
  48         .ctrl_mod_reg_offset    = AM35XX_EMAC_CNTRL_MOD_OFFSET,
  49         .ctrl_ram_offset        = AM35XX_EMAC_CNTRL_RAM_OFFSET,
  50         .ctrl_ram_size          = AM35XX_EMAC_CNTRL_RAM_SIZE,
  51         .hw_ram_addr            = AM35XX_EMAC_HW_RAM_ADDR,
  52         .version                = EMAC_VERSION_2,
  53         .interrupt_enable       = am35xx_enable_emac_int,
  54         .interrupt_disable      = am35xx_disable_emac_int,
  55 };
  56
  57 static struct mdio_platform_data am35xx_mdio_pdata;
  58
  59 static int __init omap_davinci_emac_dev_init(struct omap_hwmod *oh,
  60                 void *pdata, int pdata_len)
  61 {
  62         struct platform_device *pdev;
  63
  64         pdev = omap_device_build(oh->class->name, 0, oh, pdata, pdata_len);
  65         if (IS_ERR(pdev)) {
  66                 WARN(1, "Can't build omap_device for %s:%s.\n",
  67                      oh->class->name, oh->name);
  68                 return PTR_ERR(pdev);
  69         }
  70
  71         return 0;
  72 }
  73
  74 void __init am35xx_emac_init(unsigned long mdio_bus_freq, u8 rmii_en)
  75 {
  76         struct omap_hwmod *oh;
  77         u32 v;
  78         int ret;
  79
  80         oh = omap_hwmod_lookup("davinci_mdio");
  81         if (!oh) {
  82                 pr_err("Could not find davinci_mdio hwmod\n");
  83                 return;
  84         }
  85
  86         am35xx_mdio_pdata.bus_freq = mdio_bus_freq;
  87
  88         ret = omap_davinci_emac_dev_init(oh, &am35xx_mdio_pdata,
  89                                          sizeof(am35xx_mdio_pdata));
  90         if (ret) {
  91                 pr_err("Could not build davinci_mdio hwmod device\n");
  92                 return;
  93         }
  94
  95         oh = omap_hwmod_lookup("davinci_emac");
  96         if (!oh) {
  97                 pr_err("Could not find davinci_emac hwmod\n");
  98                 return;
  99         }
 100
 101         am35xx_emac_pdata.rmii_en = rmii_en;
 102
 103         ret = omap_davinci_emac_dev_init(oh, &am35xx_emac_pdata,
 104                                          sizeof(am35xx_emac_pdata));
 105         if (ret) {
 106                 pr_err("Could not build davinci_emac hwmod device\n");
 107                 return;
 108         }
 109
 110         v = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
 111         v &= ~AM35XX_CPGMACSS_SW_RST;
 112         omap_ctrl_writel(v, AM35XX_CONTROL_IP_SW_RESET);
 113         omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET); /* OCP barrier */
 114 }