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_platform.h>
  17 #include <linux/of.h>
  18 #include <linux/of_address.h>
  19 #include <linux/clk-provider.h>
  20 #include <linux/regmap.h>
  21 #include <linux/smp.h>
  22 #include <asm/smp_scu.h>
  23 #include <asm/mach/arch.h>
  24 #include <asm/mach/map.h>
  25 #include <asm/psci.h>
  26 #include <linux/arm-smccc.h>
  27
  28
  29 #define ARTPEC6_DMACFG_REGNUM 0x10
  30 #define ARTPEC6_DMACFG_UARTS_BURST 0xff
  31
  32 #define SECURE_OP_L2C_WRITEREG 0xb4000001
  33
  34 static void __init artpec6_init_machine(void)
  35 {
  36         struct regmap *regmap;
  37
  38         regmap = syscon_regmap_lookup_by_compatible("axis,artpec6-syscon");
  39
  40         if (!IS_ERR(regmap)) {
  41                 /* Use PL011 DMA Burst Request signal instead of DMA
  42                  *  Single Request
  43                  */
  44                 regmap_write(regmap, ARTPEC6_DMACFG_REGNUM,
  45                              ARTPEC6_DMACFG_UARTS_BURST);
  46         };
  47
  48         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  49 }
  50
  51 static void artpec6_l2c310_write_sec(unsigned long val, unsigned reg)
  52 {
  53         struct arm_smccc_res res;
  54
  55         arm_smccc_smc(SECURE_OP_L2C_WRITEREG, reg, val, 0,
  56                       0, 0, 0, 0, &res);
  57
  58         WARN_ON(res.a0);
  59 }
  60
  61 static const char * const artpec6_dt_match[] = {
  62         "axis,artpec6",
  63         NULL
  64 };
  65
  66 DT_MACHINE_START(ARTPEC6, "Axis ARTPEC-6 Platform")
  67         .l2c_aux_val    = 0x0C000000,
  68         .l2c_aux_mask   = 0xF3FFFFFF,
  69         .l2c_write_sec  = artpec6_l2c310_write_sec,
  70         .init_machine   = artpec6_init_machine,
  71         .dt_compat      = artpec6_dt_match,
  72 MACHINE_END