arch/arm/mach-spear13xx/spear13xx.c

   1 /*
   2  * arch/arm/mach-spear13xx/spear13xx.c
   3  *
   4  * SPEAr13XX machines common source file
   5  *
   6  * Copyright (C) 2012 ST Microelectronics
   7  * Viresh Kumar <viresh.linux@gmail.com>
   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) "SPEAr13xx: " fmt
  15
  16 #include <linux/amba/pl022.h>
  17 #include <linux/clk.h>
  18 #include <linux/dw_dmac.h>
  19 #include <linux/err.h>
  20 #include <linux/of_irq.h>
  21 #include <asm/hardware/cache-l2x0.h>
  22 #include <asm/hardware/gic.h>
  23 #include <asm/mach/map.h>
  24 #include <asm/smp_twd.h>
  25 #include <mach/dma.h>
  26 #include <mach/generic.h>
  27 #include <mach/spear.h>
  28
  29 /* common dw_dma filter routine to be used by peripherals */
  30 bool dw_dma_filter(struct dma_chan *chan, void *slave)
  31 {
  32         struct dw_dma_slave *dws = (struct dw_dma_slave *)slave;
  33
  34         if (chan->device->dev == dws->dma_dev) {
  35                 chan->private = slave;
  36                 return true;
  37         } else {
  38                 return false;
  39         }
  40 }
  41
  42 /* ssp device registration */
  43 static struct dw_dma_slave ssp_dma_param[] = {
  44         {
  45                 /* Tx */
  46                 .cfg_hi = DWC_CFGH_DST_PER(DMA_REQ_SSP0_TX),
  47                 .cfg_lo = 0,
  48                 .src_master = DMA_MASTER_MEMORY,
  49                 .dst_master = DMA_MASTER_SSP0,
  50         }, {
  51                 /* Rx */
  52                 .cfg_hi = DWC_CFGH_SRC_PER(DMA_REQ_SSP0_RX),
  53                 .cfg_lo = 0,
  54                 .src_master = DMA_MASTER_SSP0,
  55                 .dst_master = DMA_MASTER_MEMORY,
  56         }
  57 };
  58
  59 struct pl022_ssp_controller pl022_plat_data = {
  60         .enable_dma = 1,
  61         .dma_filter = dw_dma_filter,
  62         .dma_rx_param = &ssp_dma_param[1],
  63         .dma_tx_param = &ssp_dma_param[0],
  64 };
  65
  66 /* CF device registration */
  67 struct dw_dma_slave cf_dma_priv = {
  68         .cfg_hi = 0,
  69         .cfg_lo = 0,
  70         .src_master = 0,
  71         .dst_master = 0,
  72 };
  73
  74 /* dmac device registeration */
  75 struct dw_dma_platform_data dmac_plat_data = {
  76         .nr_channels = 8,
  77         .chan_allocation_order = CHAN_ALLOCATION_DESCENDING,
  78         .chan_priority = CHAN_PRIORITY_DESCENDING,
  79         .block_size = 4095U,
  80         .nr_masters = 2,
  81         .data_width = { 3, 3, 0, 0 },
  82 };
  83
  84 void __init spear13xx_l2x0_init(void)
  85 {
  86         /*
  87          * 512KB (64KB/way), 8-way associativity, parity supported
  88          *
  89          * FIXME: 9th bit, of Auxillary Controller register must be set
  90          * for some spear13xx devices for stable L2 operation.
  91          *
  92          * Enable Early BRESP, L2 prefetch for Instruction and Data,
  93          * write alloc and 'Full line of zero' options
  94          *
  95          */
  96
  97         writel_relaxed(0x06, VA_L2CC_BASE + L2X0_PREFETCH_CTRL);
  98
  99         /*
 100          * Program following latencies in order to make
 101          * SPEAr1340 work at 600 MHz
 102          */
 103         writel_relaxed(0x221, VA_L2CC_BASE + L2X0_TAG_LATENCY_CTRL);
 104         writel_relaxed(0x441, VA_L2CC_BASE + L2X0_DATA_LATENCY_CTRL);
 105         l2x0_init(VA_L2CC_BASE, 0x70A60001, 0xfe00ffff);
 106 }
 107
 108 /*
 109  * Following will create 16MB static virtual/physical mappings
 110  * PHYSICAL             VIRTUAL
 111  * 0xB3000000           0xFE000000
 112  * 0xE0000000           0xFD000000
 113  * 0xEC000000           0xFC000000
 114  * 0xED000000           0xFB000000
 115  */
 116 struct map_desc spear13xx_io_desc[] __initdata = {
 117         {
 118                 .virtual        = (unsigned long)VA_PERIP_GRP2_BASE,
 119                 .pfn            = __phys_to_pfn(PERIP_GRP2_BASE),
 120                 .length         = SZ_16M,
 121                 .type           = MT_DEVICE
 122         }, {
 123                 .virtual        = (unsigned long)VA_PERIP_GRP1_BASE,
 124                 .pfn            = __phys_to_pfn(PERIP_GRP1_BASE),
 125                 .length         = SZ_16M,
 126                 .type           = MT_DEVICE
 127         }, {
 128                 .virtual        = (unsigned long)VA_A9SM_AND_MPMC_BASE,
 129                 .pfn            = __phys_to_pfn(A9SM_AND_MPMC_BASE),
 130                 .length         = SZ_16M,
 131                 .type           = MT_DEVICE
 132         }, {
 133                 .virtual        = (unsigned long)VA_L2CC_BASE,
 134                 .pfn            = __phys_to_pfn(L2CC_BASE),
 135                 .length         = SZ_4K,
 136                 .type           = MT_DEVICE
 137         },
 138 };
 139
 140 /* This will create static memory mapping for selected devices */
 141 void __init spear13xx_map_io(void)
 142 {
 143         iotable_init(spear13xx_io_desc, ARRAY_SIZE(spear13xx_io_desc));
 144 }
 145
 146 static void __init spear13xx_clk_init(void)
 147 {
 148         if (of_machine_is_compatible("st,spear1310"))
 149                 spear1310_clk_init();
 150         else if (of_machine_is_compatible("st,spear1340"))
 151                 spear1340_clk_init();
 152         else
 153                 pr_err("%s: Unknown machine\n", __func__);
 154 }
 155
 156 static void __init spear13xx_timer_init(void)
 157 {
 158         char pclk_name[] = "osc_24m_clk";
 159         struct clk *gpt_clk, *pclk;
 160
 161         spear13xx_clk_init();
 162
 163         /* get the system timer clock */
 164         gpt_clk = clk_get_sys("gpt0", NULL);
 165         if (IS_ERR(gpt_clk)) {
 166                 pr_err("%s:couldn't get clk for gpt\n", __func__);
 167                 BUG();
 168         }
 169
 170         /* get the suitable parent clock for timer*/
 171         pclk = clk_get(NULL, pclk_name);
 172         if (IS_ERR(pclk)) {
 173                 pr_err("%s:couldn't get %s as parent for gpt\n", __func__,
 174                                 pclk_name);
 175                 BUG();
 176         }
 177
 178         clk_set_parent(gpt_clk, pclk);
 179         clk_put(gpt_clk);
 180         clk_put(pclk);
 181
 182         spear_setup_of_timer();
 183         twd_local_timer_of_register();
 184 }
 185
 186 struct sys_timer spear13xx_timer = {
 187         .init = spear13xx_timer_init,
 188 };
 189
 190 static const struct of_device_id gic_of_match[] __initconst = {
 191         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init },
 192         { /* Sentinel */ }
 193 };
 194
 195 void __init spear13xx_dt_init_irq(void)
 196 {
 197         of_irq_init(gic_of_match);
 198 }