arch/arm/mach-spear/spear3xx.c

   1 /*
   2  * arch/arm/mach-spear3xx/spear3xx.c
   3  *
   4  * SPEAr3XX machines common source file
   5  *
   6  * Copyright (C) 2009-2012 ST Microelectronics
   7  * Viresh Kumar <vireshk@kernel.org>
   8  *
   9  * This file is licensed under the terms of the GNU General Public
  10  * License version 2. This program is licensed "as is" without any
  11  * warranty of any kind, whether express or implied.
  12  */
  13
  14 #define pr_fmt(fmt) "SPEAr3xx: " fmt
  15
  16 #include <linux/amba/pl022.h>
  17 #include <linux/amba/pl080.h>
  18 #include <linux/clk.h>
  19 #include <linux/io.h>
  20 #include <asm/mach/map.h>
  21 #include "pl080.h"
  22 #include "generic.h"
  23 #include <mach/spear.h>
  24 #include <mach/misc_regs.h>
  25
  26 /* ssp device registration */
  27 struct pl022_ssp_controller pl022_plat_data = {
  28         .bus_id = 0,
  29         .enable_dma = 1,
  30         .dma_filter = pl08x_filter_id,
  31         .dma_tx_param = "ssp0_tx",
  32         .dma_rx_param = "ssp0_rx",
  33         /*
  34          * This is number of spi devices that can be connected to spi. There are
  35          * two type of chipselects on which slave devices can work. One is chip
  36          * select provided by spi masters other is controlled through external
  37          * gpio's. We can't use chipselect provided from spi master (because as
  38          * soon as FIFO becomes empty, CS is disabled and transfer ends). So
  39          * this number now depends on number of gpios available for spi. each
  40          * slave on each master requires a separate gpio pin.
  41          */
  42         .num_chipselect = 2,
  43 };
  44
  45 /* dmac device registration */
  46 struct pl08x_platform_data pl080_plat_data = {
  47         .memcpy_burst_size = PL08X_BURST_SZ_16,
  48         .memcpy_bus_width = PL08X_BUS_WIDTH_32_BITS,
  49         .memcpy_prot_buff = true,
  50         .memcpy_prot_cache = true,
  51         .lli_buses = PL08X_AHB1,
  52         .mem_buses = PL08X_AHB1,
  53         .get_xfer_signal = pl080_get_signal,
  54         .put_xfer_signal = pl080_put_signal,
  55 };
  56
  57 /*
  58  * Following will create 16MB static virtual/physical mappings
  59  * PHYSICAL             VIRTUAL
  60  * 0xD0000000           0xFD000000
  61  * 0xFC000000           0xFC000000
  62  */
  63 struct map_desc spear3xx_io_desc[] __initdata = {
  64         {
  65                 .virtual        = (unsigned long)VA_SPEAR_ICM1_2_BASE,
  66                 .pfn            = __phys_to_pfn(SPEAR_ICM1_2_BASE),
  67                 .length         = SZ_16M,
  68                 .type           = MT_DEVICE
  69         }, {
  70                 .virtual        = (unsigned long)VA_SPEAR_ICM3_SMI_CTRL_BASE,
  71                 .pfn            = __phys_to_pfn(SPEAR_ICM3_SMI_CTRL_BASE),
  72                 .length         = SZ_16M,
  73                 .type           = MT_DEVICE
  74         },
  75 };
  76
  77 /* This will create static memory mapping for selected devices */
  78 void __init spear3xx_map_io(void)
  79 {
  80         iotable_init(spear3xx_io_desc, ARRAY_SIZE(spear3xx_io_desc));
  81 }
  82
  83 void __init spear3xx_timer_init(void)
  84 {
  85         char pclk_name[] = "pll3_clk";
  86         struct clk *gpt_clk, *pclk;
  87
  88         spear3xx_clk_init(MISC_BASE, VA_SPEAR320_SOC_CONFIG_BASE);
  89
  90         /* get the system timer clock */
  91         gpt_clk = clk_get_sys("gpt0", NULL);
  92         if (IS_ERR(gpt_clk)) {
  93                 pr_err("%s:couldn't get clk for gpt\n", __func__);
  94                 BUG();
  95         }
  96
  97         /* get the suitable parent clock for timer*/
  98         pclk = clk_get(NULL, pclk_name);
  99         if (IS_ERR(pclk)) {
 100                 pr_err("%s:couldn't get %s as parent for gpt\n",
 101                                 __func__, pclk_name);
 102                 BUG();
 103         }
 104
 105         clk_set_parent(gpt_clk, pclk);
 106         clk_put(gpt_clk);
 107         clk_put(pclk);
 108
 109         spear_setup_of_timer();
 110 }