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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e517881e42
i8259 PIC is disabled on MPC8610HPCD boards, thus currently rtc-cmos driver fails to probe. To fix the issue, we lookup the device tree for "chrp,iic" and "pnpPNP,000" compatible devices, and if not found we do not assign RTC IRQ and assuming that i8259 was disabled. Though this patch fixes RTC on some boards (and surely should not break any other), the whole approach is still broken. We can't easily fix this though, because old device trees do not specify i8259 interrupts for the cmos rtc node. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
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* Setup code for PC-style Real-Time Clock.
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*
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* Author: Wade Farnsworth <wfarnsworth@mvista.com>
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*
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* 2007 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/mc146818rtc.h>
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#include <asm/prom.h>
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static int __init add_rtc(void)
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{
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struct device_node *np;
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struct platform_device *pd;
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struct resource res[2];
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unsigned int num_res = 1;
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int ret;
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memset(&res, 0, sizeof(res));
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np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
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if (!np)
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return -ENODEV;
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ret = of_address_to_resource(np, 0, &res[0]);
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of_node_put(np);
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if (ret)
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return ret;
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/*
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* RTC_PORT(x) is hardcoded in asm/mc146818rtc.h. Verify that the
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* address provided by the device node matches.
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*/
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if (res[0].start != RTC_PORT(0))
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return -EINVAL;
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np = of_find_compatible_node(NULL, NULL, "chrp,iic");
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if (!np)
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np = of_find_compatible_node(NULL, NULL, "pnpPNP,000");
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if (np) {
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of_node_put(np);
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/*
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* Use a fixed interrupt value of 8 since on PPC if we are
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* using this its off an i8259 which we ensure has interrupt
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* numbers 0..15.
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*/
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res[1].start = 8;
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res[1].end = 8;
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res[1].flags = IORESOURCE_IRQ;
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num_res++;
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}
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pd = platform_device_register_simple("rtc_cmos", -1,
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&res[0], num_res);
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if (IS_ERR(pd))
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return PTR_ERR(pd);
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return 0;
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}
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fs_initcall(add_rtc);
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MODULE_LICENSE("GPL");
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