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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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225ae5fd9a
The CBUS UART's interrupt number was wrong conflicting with the interrupt being tied to the Intel PIIX4. Since the PIIX4's interrupt is registered before the CBUS UART which is not being used on most systems this would not be noticed. Attempts to open the ttyS2 CBUS UART would result in: genirq: Flags mismatch irq 18. 00000000 (serial) vs. 00010000 (XT-PIC cascade) serial_link_irq_chain: request failed: -16 for irq: 18 Qemu was written to match the kernel so will need to be fixed also. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2006, 07 MIPS Technologies, Inc.
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* written by Ralf Baechle (ralf@linux-mips.org)
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* written by Ralf Baechle <ralf@linux-mips.org>
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*
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* Copyright (C) 2008 Wind River Systems, Inc.
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* updated by Tiejun Chen <tiejun.chen@windriver.com>
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*
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* 1. Probe driver for the Malta's UART ports:
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*
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* o 2 ports in the SMC SuperIO
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* o 1 port in the CBUS UART, a discrete 16550 which normally is only used
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* for bringups.
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*
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* We don't use 8250_platform.c on Malta as it would result in the CBUS
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* UART becoming ttyS0.
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*
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* 2. Register RTC-CMOS platform device on Malta.
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*/
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#include <linux/init.h>
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#include <linux/serial_8250.h>
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#include <linux/mc146818rtc.h>
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#include <linux/module.h>
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#include <linux/irq.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/physmap.h>
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#include <linux/platform_device.h>
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#include <asm/mips-boards/maltaint.h>
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#include <mtd/mtd-abi.h>
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#define SMC_PORT(base, int) \
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{ \
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.iobase = base, \
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.irq = int, \
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.uartclk = 1843200, \
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.iotype = UPIO_PORT, \
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.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, \
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.regshift = 0, \
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}
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#define CBUS_UART_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP)
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static struct plat_serial8250_port uart8250_data[] = {
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SMC_PORT(0x3F8, 4),
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SMC_PORT(0x2F8, 3),
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{
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.mapbase = 0x1f000900, /* The CBUS UART */
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.irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB2,
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.uartclk = 3686400, /* Twice the usual clk! */
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.iotype = UPIO_MEM32,
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.flags = CBUS_UART_FLAGS,
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.regshift = 3,
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},
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{ },
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};
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static struct platform_device malta_uart8250_device = {
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.name = "serial8250",
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.id = PLAT8250_DEV_PLATFORM,
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.dev = {
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.platform_data = uart8250_data,
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},
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};
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struct resource malta_rtc_resources[] = {
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{
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.start = RTC_PORT(0),
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.end = RTC_PORT(7),
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.flags = IORESOURCE_IO,
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}, {
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.start = RTC_IRQ,
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.end = RTC_IRQ,
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.flags = IORESOURCE_IRQ,
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}
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};
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static struct platform_device malta_rtc_device = {
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.name = "rtc_cmos",
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.id = -1,
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.resource = malta_rtc_resources,
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.num_resources = ARRAY_SIZE(malta_rtc_resources),
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};
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static struct mtd_partition malta_mtd_partitions[] = {
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{
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.name = "YAMON",
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.offset = 0x0,
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.size = 0x100000,
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.mask_flags = MTD_WRITEABLE
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}, {
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.name = "User FS",
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.offset = 0x100000,
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.size = 0x2e0000
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}, {
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.name = "Board Config",
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.offset = 0x3e0000,
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.size = 0x020000,
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.mask_flags = MTD_WRITEABLE
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}
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};
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static struct physmap_flash_data malta_flash_data = {
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.width = 4,
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.nr_parts = ARRAY_SIZE(malta_mtd_partitions),
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.parts = malta_mtd_partitions
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};
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static struct resource malta_flash_resource = {
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.start = 0x1e000000,
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.end = 0x1e3fffff,
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.flags = IORESOURCE_MEM
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};
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static struct platform_device malta_flash_device = {
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.name = "physmap-flash",
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.id = 0,
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.dev = {
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.platform_data = &malta_flash_data,
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},
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.num_resources = 1,
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.resource = &malta_flash_resource,
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};
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static struct platform_device *malta_devices[] __initdata = {
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&malta_uart8250_device,
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&malta_rtc_device,
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&malta_flash_device,
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};
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static int __init malta_add_devices(void)
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{
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int err;
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err = platform_add_devices(malta_devices, ARRAY_SIZE(malta_devices));
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if (err)
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return err;
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return 0;
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}
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device_initcall(malta_add_devices);
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