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lib: utils/ipi: Add Andes fdt ipi driver support

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Move Andes PLICSW ipi device to fdt ipi framework, this patch is based
on Leo's modified IPI scheme on PLICSW.

Current IPI scheme uses bit 0 of pending reigster on PLICSW to send IPI
from hart 0 to hart 7, but bit 0 needs to be hardwired to 0 according
to spec. After some investigation, self-IPI seems to be seldom or never
used, so we re-order the IPI scheme to support 8 core platforms.

dts example (Quad-core AX45MP):

  plicsw: interrupt-controller@e6400000 {
          compatible = "andestech,plicsw";
          reg = <0x00000000 0xe6400000 0x00000000 0x00400000>;
          interrupts-extended = <&CPU0_intc 3
                                 &CPU1_intc 3
                                 &CPU2_intc 3
                                 &CPU3_intc 3>;
          interrupt-controller;
          #address-cells = <2>;
          #interrupt-cells = <2>;
  };

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Yu Chien Peter Lin
2022-10-14 08:32:50 +08:00
committed by Anup Patel
parent 6f3258e671
commit ce7c490719
13 changed files with 305 additions and 211 deletions
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46
include/sbi_utils/ipi/andes_plicsw.h Normal file
View File

@@ -0,0 +1,46 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Andes Technology Corporation
*
* Authors:
* Zong Li <zong@andestech.com>
* Nylon Chen <nylon7@andestech.com>
* Leo Yu-Chi Liang <ycliang@andestech.com>
* Yu Chien Peter Lin <peterlin@andestech.com>
*/
#ifndef _IPI_ANDES_PLICSW_H_
#define _IPI_ANDES_PLICSW_H_
#define PLICSW_PRIORITY_BASE 0x4
#define PLICSW_PENDING_BASE 0x1000
#define PLICSW_PENDING_STRIDE 0x8
#define PLICSW_ENABLE_BASE 0x2000
#define PLICSW_ENABLE_STRIDE 0x80
#define PLICSW_CONTEXT_BASE 0x200000
#define PLICSW_CONTEXT_STRIDE 0x1000
#define PLICSW_CONTEXT_CLAIM 0x4
#define PLICSW_HART_MASK 0x01010101
#define PLICSW_HART_MAX_NR 8
#define PLICSW_REGION_ALIGN 0x1000
struct plicsw_data {
unsigned long addr;
unsigned long size;
uint32_t hart_count;
/* hart id to source id table */
uint32_t source_id[PLICSW_HART_MAX_NR];
};
int plicsw_warm_ipi_init(void);
int plicsw_cold_ipi_init(struct plicsw_data *plicsw);
#endif /* _IPI_ANDES_PLICSW_H_ */