![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
221 lines
5.2 KiB
C
221 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Imagination Technologies
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* Author: Paul Burton <paul.burton@mips.com>
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*/
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#define pr_fmt(fmt) "sead3: " fmt
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#include <linux/errno.h>
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#include <linux/libfdt.h>
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#include <linux/printk.h>
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#include <linux/sizes.h>
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#include <asm/fw/fw.h>
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#include <asm/io.h>
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#include <asm/machine.h>
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#include <asm/yamon-dt.h>
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#define SEAD_CONFIG CKSEG1ADDR(0x1b100110)
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#define SEAD_CONFIG_GIC_PRESENT BIT(1)
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#define MIPS_REVISION CKSEG1ADDR(0x1fc00010)
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#define MIPS_REVISION_MACHINE (0xf << 4)
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#define MIPS_REVISION_MACHINE_SEAD3 (0x4 << 4)
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/*
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* Maximum 384MB RAM at physical address 0, preceding any I/O.
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*/
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static struct yamon_mem_region mem_regions[] __initdata = {
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/* start size */
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{ 0, SZ_256M + SZ_128M },
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{}
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};
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static __init bool sead3_detect(void)
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{
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uint32_t rev;
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rev = __raw_readl((void *)MIPS_REVISION);
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return (rev & MIPS_REVISION_MACHINE) == MIPS_REVISION_MACHINE_SEAD3;
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}
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static __init int append_memory(void *fdt)
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{
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return yamon_dt_append_memory(fdt, mem_regions);
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}
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static __init int remove_gic(void *fdt)
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{
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const unsigned int cpu_ehci_int = 2;
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const unsigned int cpu_uart_int = 4;
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const unsigned int cpu_eth_int = 6;
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int gic_off, cpu_off, uart_off, eth_off, ehci_off, err;
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uint32_t cfg, cpu_phandle;
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/* leave the GIC node intact if a GIC is present */
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cfg = __raw_readl((uint32_t *)SEAD_CONFIG);
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if (cfg & SEAD_CONFIG_GIC_PRESENT)
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return 0;
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gic_off = fdt_node_offset_by_compatible(fdt, -1, "mti,gic");
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if (gic_off < 0) {
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pr_err("unable to find DT GIC node: %d\n", gic_off);
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return gic_off;
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}
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err = fdt_nop_node(fdt, gic_off);
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if (err) {
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pr_err("unable to nop GIC node\n");
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return err;
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}
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cpu_off = fdt_node_offset_by_compatible(fdt, -1,
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"mti,cpu-interrupt-controller");
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if (cpu_off < 0) {
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pr_err("unable to find CPU intc node: %d\n", cpu_off);
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return cpu_off;
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}
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cpu_phandle = fdt_get_phandle(fdt, cpu_off);
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if (!cpu_phandle) {
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pr_err("unable to get CPU intc phandle\n");
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return -EINVAL;
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}
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uart_off = fdt_node_offset_by_compatible(fdt, -1, "ns16550a");
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while (uart_off >= 0) {
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err = fdt_setprop_u32(fdt, uart_off, "interrupt-parent",
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cpu_phandle);
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if (err) {
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pr_warn("unable to set UART interrupt-parent: %d\n",
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err);
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return err;
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}
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err = fdt_setprop_u32(fdt, uart_off, "interrupts",
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cpu_uart_int);
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if (err) {
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pr_err("unable to set UART interrupts property: %d\n",
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err);
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return err;
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}
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uart_off = fdt_node_offset_by_compatible(fdt, uart_off,
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"ns16550a");
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}
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if (uart_off != -FDT_ERR_NOTFOUND) {
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pr_err("error searching for UART DT node: %d\n", uart_off);
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return uart_off;
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}
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eth_off = fdt_node_offset_by_compatible(fdt, -1, "smsc,lan9115");
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if (eth_off < 0) {
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pr_err("unable to find ethernet DT node: %d\n", eth_off);
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return eth_off;
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}
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err = fdt_setprop_u32(fdt, eth_off, "interrupt-parent", cpu_phandle);
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if (err) {
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pr_err("unable to set ethernet interrupt-parent: %d\n", err);
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return err;
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}
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err = fdt_setprop_u32(fdt, eth_off, "interrupts", cpu_eth_int);
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if (err) {
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pr_err("unable to set ethernet interrupts property: %d\n", err);
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return err;
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}
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ehci_off = fdt_node_offset_by_compatible(fdt, -1, "generic-ehci");
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if (ehci_off < 0) {
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pr_err("unable to find EHCI DT node: %d\n", ehci_off);
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return ehci_off;
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}
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err = fdt_setprop_u32(fdt, ehci_off, "interrupt-parent", cpu_phandle);
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if (err) {
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pr_err("unable to set EHCI interrupt-parent: %d\n", err);
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return err;
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}
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err = fdt_setprop_u32(fdt, ehci_off, "interrupts", cpu_ehci_int);
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if (err) {
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pr_err("unable to set EHCI interrupts property: %d\n", err);
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return err;
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}
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return 0;
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}
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static const struct mips_fdt_fixup sead3_fdt_fixups[] __initconst = {
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{ yamon_dt_append_cmdline, "append command line" },
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{ append_memory, "append memory" },
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{ remove_gic, "remove GIC when not present" },
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{ yamon_dt_serial_config, "append serial configuration" },
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{ },
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};
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static __init const void *sead3_fixup_fdt(const void *fdt,
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const void *match_data)
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{
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static unsigned char fdt_buf[16 << 10] __initdata;
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int err;
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if (fdt_check_header(fdt))
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panic("Corrupt DT");
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/* if this isn't SEAD3, something went wrong */
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BUG_ON(fdt_node_check_compatible(fdt, 0, "mti,sead-3"));
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fw_init_cmdline();
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err = apply_mips_fdt_fixups(fdt_buf, sizeof(fdt_buf),
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fdt, sead3_fdt_fixups);
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if (err)
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panic("Unable to fixup FDT: %d", err);
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return fdt_buf;
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}
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static __init unsigned int sead3_measure_hpt_freq(void)
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{
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void __iomem *status_reg = (void __iomem *)0xbf000410;
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unsigned int freq, orig, tick = 0;
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unsigned long flags;
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local_irq_save(flags);
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orig = readl(status_reg) & 0x2; /* get original sample */
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/* wait for transition */
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while ((readl(status_reg) & 0x2) == orig)
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;
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orig = orig ^ 0x2; /* flip the bit */
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write_c0_count(0);
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/* wait 1 second (the sampling clock transitions every 10ms) */
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while (tick < 100) {
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/* wait for transition */
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while ((readl(status_reg) & 0x2) == orig)
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;
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orig = orig ^ 0x2; /* flip the bit */
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tick++;
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}
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freq = read_c0_count();
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local_irq_restore(flags);
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return freq;
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}
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extern char __dtb_sead3_begin[];
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MIPS_MACHINE(sead3) = {
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.fdt = __dtb_sead3_begin,
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.detect = sead3_detect,
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.fixup_fdt = sead3_fixup_fdt,
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.measure_hpt_freq = sead3_measure_hpt_freq,
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};
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