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+/*
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+ * AXS101 Software Development Platform
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+ *
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+ * Copyright (C) 2013-15 Synopsys, Inc. (www.synopsys.com)
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ */
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+
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+#include <linux/of_platform.h>
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+#include <asm/mach_desc.h>
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+#include <asm/io.h>
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+
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+#define AXS_MB_CGU 0xE0010000
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+#define AXS_MB_CREG 0xE0011000
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+
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+#define CREG_MB_IRQ_MUX (AXS_MB_CREG + 0x214)
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+#define CREG_MB_SW_RESET (AXS_MB_CREG + 0x220)
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+#define CREG_MB_VER (AXS_MB_CREG + 0x230)
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+#define CREG_MB_CONFIG (AXS_MB_CREG + 0x234)
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+
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+#define AXC001_CREG 0xF0001000
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+#define AXC001_GPIO_INTC 0xF0003000
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+
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+#define CREG_CPU_ADDR_770 (AXC001_CREG + 0x20)
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+#define CREG_CPU_ADDR_TUNN (AXC001_CREG + 0x60)
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+#define CREG_CPU_ADDR_770_UPD (AXC001_CREG + 0x34)
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+#define CREG_CPU_ADDR_TUNN_UPD (AXC001_CREG + 0x74)
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+
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+#define CREG_CPU_ARC770_IRQ_MUX (AXC001_CREG + 0x114)
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+#define CREG_CPU_GPIO_UART_MUX (AXC001_CREG + 0x120)
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+
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+static void enable_gpio_intc_wire(void)
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+{
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+ /*
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+ * Peripherals on CPU Card and Mother Board are wired to cpu intc via
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+ * intermediate DW APB GPIO blocks (mainly for debouncing)
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+ *
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+ * ---------------------
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+ * | snps,arc700-intc |
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+ * ---------------------
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+ * | #7 | #15
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+ * ------------------- -------------------
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+ * | snps,dw-apb-gpio | | snps,dw-apb-gpio |
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+ * ------------------- -------------------
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+ * | |
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+ * | [ Debug UART on cpu card ]
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+ * |
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+ * ------------------------
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+ * | snps,dw-apb-intc (MB)|
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+ * ------------------------
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+ * | | | |
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+ * [eth] [uart] [... other perip on Main Board]
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+ *
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+ * Current implementation of "irq-dw-apb-ictl" driver doesn't work well
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+ * with stacked INTCs. In particular problem happens if its master INTC
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+ * not yet instantiated. See discussion here -
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+ * https://lkml.org/lkml/2015/3/4/755
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+ *
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+ * So setup the first gpio block as a passive pass thru and hide it from
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+ * DT hardware topology - connect MB intc directly to cpu intc
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+ * The GPIO "wire" needs to be init nevertheless (here)
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+ *
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+ * One side adv is that peripheral interrupt handling avoids one nested
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+ * intc ISR hop
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+ */
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+#define GPIO_INTEN (AXC001_GPIO_INTC + 0x30)
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+#define GPIO_INTMASK (AXC001_GPIO_INTC + 0x34)
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+#define GPIO_INTTYPE_LEVEL (AXC001_GPIO_INTC + 0x38)
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+#define GPIO_INT_POLARITY (AXC001_GPIO_INTC + 0x3c)
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+#define MB_TO_GPIO_IRQ 12
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+
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+ iowrite32(~(1 << MB_TO_GPIO_IRQ), (void __iomem *) GPIO_INTMASK);
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+ iowrite32(0, (void __iomem *) GPIO_INTTYPE_LEVEL);
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+ iowrite32(~0, (void __iomem *) GPIO_INT_POLARITY);
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+ iowrite32(1 << MB_TO_GPIO_IRQ, (void __iomem *) GPIO_INTEN);
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+}
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+
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+static void axs10x_print_board_ver(unsigned int creg, const char *str)
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+{
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+ union ver {
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+ struct {
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+#ifdef CONFIG_CPU_BIG_ENDIAN
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+ unsigned int pad:11, y:12, m:4, d:5;
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+#else
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+ unsigned int d:5, m:4, y:12, pad:11;
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+#endif
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+ };
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+ unsigned int val;
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+ } board;
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+
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+ board.val = ioread32((void __iomem *)creg);
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+ pr_info("AXS: %s FPGA Date: %u-%u-%u\n", str, board.d, board.m,
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+ board.y);
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+}
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+
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+static void axs10x_early_init(void)
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+{
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+ int mb_rev;
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+ char mb[32];
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+
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+ /* Determine motherboard version */
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+ if (ioread32((void __iomem *) CREG_MB_CONFIG) & (1 << 28))
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+ mb_rev = 3; /* HT-3 (rev3.0) */
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+ else
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+ mb_rev = 2; /* HT-2 (rev2.0) */
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+
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+ enable_gpio_intc_wire();
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+
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+ scnprintf(mb, 32, "MainBoard v%d", mb_rev);
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+ axs10x_print_board_ver(CREG_MB_VER, mb);
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+}
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+
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+/*
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+ * Set up System Memory Map for ARC cpu / peripherals controllers
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+ *
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+ * Each AXI master has a 4GB memory map specified as 16 apertures of 256MB, each
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+ * of which maps to a corresponding 256MB aperture in Target slave memory map.
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+ *
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+ * e.g. ARC cpu AXI Master's aperture 8 (0x8000_0000) is mapped to aperture 0
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+ * (0x0000_0000) of DDR Port 0 (slave #1)
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+ *
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+ * Access from cpu to MB controllers such as GMAC is setup using AXI Tunnel:
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+ * which has master/slaves on both ends.
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+ * e.g. aperture 14 (0xE000_0000) of ARC cpu is mapped to aperture 14
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+ * (0xE000_0000) of CPU Card AXI Tunnel slave (slave #3) which is mapped to
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+ * MB AXI Tunnel Master, which also has a mem map setup
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+ *
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+ * In the reverse direction, MB AXI Masters (e.g. GMAC) mem map is setup
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+ * to map to MB AXI Tunnel slave which connects to CPU Card AXI Tunnel Master
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+ */
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+struct aperture {
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+ unsigned int slave_sel:4, slave_off:4, pad:24;
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+};
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+
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+/* CPU Card target slaves */
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+#define AXC001_SLV_NONE 0
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+#define AXC001_SLV_DDR_PORT0 1
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+#define AXC001_SLV_SRAM 2
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+#define AXC001_SLV_AXI_TUNNEL 3
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+#define AXC001_SLV_AXI2APB 6
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+#define AXC001_SLV_DDR_PORT1 7
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+
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+/* MB AXI Target slaves */
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+#define AXS_MB_SLV_NONE 0
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+#define AXS_MB_SLV_AXI_TUNNEL_CPU 1
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+#define AXS_MB_SLV_AXI_TUNNEL_HAPS 2
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+#define AXS_MB_SLV_SRAM 3
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+#define AXS_MB_SLV_CONTROL 4
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+
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+/* MB AXI masters */
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+#define AXS_MB_MST_TUNNEL_CPU 0
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+#define AXS_MB_MST_USB_OHCI 10
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+
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+/*
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+ * memmap for ARC core on CPU Card
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+ */
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+static const struct aperture axc001_memmap[16] = {
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+ {AXC001_SLV_AXI_TUNNEL, 0x0},
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+ {AXC001_SLV_AXI_TUNNEL, 0x1},
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+ {AXC001_SLV_SRAM, 0x0}, /* 0x2000_0000: Local SRAM */
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_DDR_PORT0, 0x0}, /* 0x8000_0000: DDR 0..256M */
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+ {AXC001_SLV_DDR_PORT0, 0x1}, /* 0x9000_0000: DDR 256..512M */
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+ {AXC001_SLV_DDR_PORT1, 0x0},
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+ {AXC001_SLV_DDR_PORT1, 0x1},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_AXI_TUNNEL, 0xD},
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+ {AXC001_SLV_AXI_TUNNEL, 0xE}, /* MB: CREG, CGU... */
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+ {AXC001_SLV_AXI2APB, 0x0}, /* CPU Card local CREG, CGU... */
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+};
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+
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+/*
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+ * memmap for CPU Card AXI Tunnel Master (for access by MB controllers)
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+ * GMAC (MB) -> MB AXI Tunnel slave -> CPU Card AXI Tunnel Master -> DDR
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+ */
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+static const struct aperture axc001_axi_tunnel_memmap[16] = {
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+ {AXC001_SLV_AXI_TUNNEL, 0x0},
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+ {AXC001_SLV_AXI_TUNNEL, 0x1},
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+ {AXC001_SLV_SRAM, 0x0},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_DDR_PORT0, 0x0},
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+ {AXC001_SLV_DDR_PORT0, 0x1},
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+ {AXC001_SLV_DDR_PORT1, 0x0},
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+ {AXC001_SLV_DDR_PORT1, 0x1},
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+ {AXC001_SLV_NONE, 0x0},
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+ {AXC001_SLV_AXI_TUNNEL, 0xD},
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+ {AXC001_SLV_AXI_TUNNEL, 0xE},
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+ {AXC001_SLV_AXI2APB, 0x0},
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+};
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+
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+/*
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+ * memmap for MB AXI Masters
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+ * Same mem map for all perip controllers as well as MB AXI Tunnel Master
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+ */
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+static const struct aperture axs_mb_memmap[16] = {
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+ {AXS_MB_SLV_SRAM, 0x0},
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+ {AXS_MB_SLV_SRAM, 0x0},
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+ {AXS_MB_SLV_NONE, 0x0},
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+ {AXS_MB_SLV_NONE, 0x0},
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+ {AXS_MB_SLV_NONE, 0x0},
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+ {AXS_MB_SLV_NONE, 0x0},
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+ {AXS_MB_SLV_NONE, 0x0},
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+ {AXS_MB_SLV_NONE, 0x0},
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+ {AXS_MB_SLV_AXI_TUNNEL_CPU, 0x8}, /* DDR on CPU Card */
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+ {AXS_MB_SLV_AXI_TUNNEL_CPU, 0x9}, /* DDR on CPU Card */
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+ {AXS_MB_SLV_AXI_TUNNEL_CPU, 0xA},
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+ {AXS_MB_SLV_AXI_TUNNEL_CPU, 0xB},
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+ {AXS_MB_SLV_NONE, 0x0},
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+ {AXS_MB_SLV_AXI_TUNNEL_HAPS, 0xD},
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+ {AXS_MB_SLV_CONTROL, 0x0}, /* MB Local CREG, CGU... */
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+ {AXS_MB_SLV_AXI_TUNNEL_CPU, 0xF},
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+};
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+
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+static noinline void
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+axs101_set_memmap(void __iomem *base, const struct aperture map[16])
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+{
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+ unsigned int slave_select, slave_offset;
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+ int i;
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+
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+ slave_select = slave_offset = 0;
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+ for (i = 0; i < 8; i++) {
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+ slave_select |= map[i].slave_sel << (i << 2);
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+ slave_offset |= map[i].slave_off << (i << 2);
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+ }
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+
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+ iowrite32(slave_select, base + 0x0); /* SLV0 */
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+ iowrite32(slave_offset, base + 0x8); /* OFFSET0 */
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+
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+ slave_select = slave_offset = 0;
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+ for (i = 0; i < 8; i++) {
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+ slave_select |= map[i+8].slave_sel << (i << 2);
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+ slave_offset |= map[i+8].slave_off << (i << 2);
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+ }
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+
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+ iowrite32(slave_select, base + 0x4); /* SLV1 */
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+ iowrite32(slave_offset, base + 0xC); /* OFFSET1 */
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+}
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+
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+static void axs101_early_init(void)
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+{
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+ int i;
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+
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+ /* ARC 770D memory view */
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+ axs101_set_memmap((void __iomem *) CREG_CPU_ADDR_770, axc001_memmap);
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+ iowrite32(1, (void __iomem *) CREG_CPU_ADDR_770_UPD);
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+
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+ /* AXI tunnel memory map (incoming traffic from MB into CPU Card */
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+ axs101_set_memmap((void __iomem *) CREG_CPU_ADDR_TUNN,
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+ axc001_axi_tunnel_memmap);
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+ iowrite32(1, (void __iomem *) CREG_CPU_ADDR_TUNN_UPD);
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+
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+ /* MB peripherals memory map */
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+ for (i = AXS_MB_MST_TUNNEL_CPU; i <= AXS_MB_MST_USB_OHCI; i++)
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+ axs101_set_memmap((void __iomem *) AXS_MB_CREG + (i << 4),
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+ axs_mb_memmap);
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+
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+ iowrite32(0x3ff, (void __iomem *) AXS_MB_CREG + 0x100); /* Update */
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+
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+ /* GPIO pins 18 and 19 are used as UART rx and tx, respectively. */
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+ iowrite32(0x01, (void __iomem *) CREG_CPU_GPIO_UART_MUX);
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+
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+ /* Set up the MB interrupt system: mux interrupts to GPIO7) */
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+ iowrite32(0x01, (void __iomem *) CREG_MB_IRQ_MUX);
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+
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+ /* reset ethernet and ULPI interfaces */
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+ iowrite32(0x18, (void __iomem *) CREG_MB_SW_RESET);
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+
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+ /* map GPIO 14:10 to ARC 9:5 (IRQ mux change for MB v2 onwards) */
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+ iowrite32(0x52, (void __iomem *) CREG_CPU_ARC770_IRQ_MUX);
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+
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+ axs10x_early_init();
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+}
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+
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+static const char *axs101_compat[] __initconst = {
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+ "snps,axs101",
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+ NULL,
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+};
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+
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+MACHINE_START(AXS101, "axs101")
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+ .dt_compat = axs101_compat,
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+ .init_early = axs101_early_init,
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+MACHINE_END
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Alexey Brodkin