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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ARTPEC-6 device support.
   4  */
   5
   6 #include <linux/amba/bus.h>
   7 #include <linux/clocksource.h>
   8 #include <linux/dma-mapping.h>
   9 #include <linux/io.h>
  10 #include <linux/irqchip.h>
  11 #include <linux/irqchip/arm-gic.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/of.h>
  14 #include <linux/of_address.h>
  15 #include <linux/clk-provider.h>
  16 #include <linux/regmap.h>
  17 #include <linux/smp.h>
  18 #include <asm/smp_scu.h>
  19 #include <asm/mach/arch.h>
  20 #include <asm/mach/map.h>
  21 #include <asm/psci.h>
  22 #include <linux/arm-smccc.h>
  23
  24
  25 #define ARTPEC6_DMACFG_REGNUM 0x10
  26 #define ARTPEC6_DMACFG_UARTS_BURST 0xff
  27
  28 #define SECURE_OP_L2C_WRITEREG 0xb4000001
  29
  30 static void __init artpec6_init_machine(void)
  31 {
  32         struct regmap *regmap;
  33
  34         regmap = syscon_regmap_lookup_by_compatible("axis,artpec6-syscon");
  35
  36         if (!IS_ERR(regmap)) {
  37                 /* Use PL011 DMA Burst Request signal instead of DMA
  38                  *  Single Request
  39                  */
  40                 regmap_write(regmap, ARTPEC6_DMACFG_REGNUM,
  41                              ARTPEC6_DMACFG_UARTS_BURST);
  42         };
  43 }
  44
  45 static void artpec6_l2c310_write_sec(unsigned long val, unsigned reg)
  46 {
  47         struct arm_smccc_res res;
  48
  49         arm_smccc_smc(SECURE_OP_L2C_WRITEREG, reg, val, 0,
  50                       0, 0, 0, 0, &res);
  51
  52         WARN_ON(res.a0);
  53 }
  54
  55 static const char * const artpec6_dt_match[] = {
  56         "axis,artpec6",
  57         NULL
  58 };
  59
  60 DT_MACHINE_START(ARTPEC6, "Axis ARTPEC-6 Platform")
  61         .l2c_aux_val    = 0x0C000000,
  62         .l2c_aux_mask   = 0xF3FFFFFF,
  63         .l2c_write_sec  = artpec6_l2c310_write_sec,
  64         .init_machine   = artpec6_init_machine,
  65         .dt_compat      = artpec6_dt_match,
  66 MACHINE_END