arch/arm/mach-artpec/board-artpec6.c

   1 /*
   2  * ARTPEC-6 device support.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/amba/bus.h>
  10 #include <linux/clocksource.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/io.h>
  13 #include <linux/irqchip.h>
  14 #include <linux/irqchip/arm-gic.h>
  15 #include <linux/mfd/syscon.h>
  16 #include <linux/of.h>
  17 #include <linux/of_address.h>
  18 #include <linux/clk-provider.h>
  19 #include <linux/regmap.h>
  20 #include <linux/smp.h>
  21 #include <asm/smp_scu.h>
  22 #include <asm/mach/arch.h>
  23 #include <asm/mach/map.h>
  24 #include <asm/psci.h>
  25 #include <linux/arm-smccc.h>
  26
  27
  28 #define ARTPEC6_DMACFG_REGNUM 0x10
  29 #define ARTPEC6_DMACFG_UARTS_BURST 0xff
  30
  31 #define SECURE_OP_L2C_WRITEREG 0xb4000001
  32
  33 static void __init artpec6_init_machine(void)
  34 {
  35         struct regmap *regmap;
  36
  37         regmap = syscon_regmap_lookup_by_compatible("axis,artpec6-syscon");
  38
  39         if (!IS_ERR(regmap)) {
  40                 /* Use PL011 DMA Burst Request signal instead of DMA
  41                  *  Single Request
  42                  */
  43                 regmap_write(regmap, ARTPEC6_DMACFG_REGNUM,
  44                              ARTPEC6_DMACFG_UARTS_BURST);
  45         };
  46 }
  47
  48 static void artpec6_l2c310_write_sec(unsigned long val, unsigned reg)
  49 {
  50         struct arm_smccc_res res;
  51
  52         arm_smccc_smc(SECURE_OP_L2C_WRITEREG, reg, val, 0,
  53                       0, 0, 0, 0, &res);
  54
  55         WARN_ON(res.a0);
  56 }
  57
  58 static const char * const artpec6_dt_match[] = {
  59         "axis,artpec6",
  60         NULL
  61 };
  62
  63 DT_MACHINE_START(ARTPEC6, "Axis ARTPEC-6 Platform")
  64         .l2c_aux_val    = 0x0C000000,
  65         .l2c_aux_mask   = 0xF3FFFFFF,
  66         .l2c_write_sec  = artpec6_l2c310_write_sec,
  67         .init_machine   = artpec6_init_machine,
  68         .dt_compat      = artpec6_dt_match,
  69 MACHINE_END