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

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  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
 67 

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