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d1b24a6140
On 32-core platform, hart31 gets stuck at secondary_hart_loop
as the corresponding enable bit is not set in enable_ipi().
We should program the next word (0x2f84) which is assigned
as the enable register of hart31. It should be done in the same
way when we invoke riscv_send_ipi() to trigger software interrupt
on hart31.
The following diagram shows the enable bits of the fixed PLICSW
scheme.
Pending regs: 0x1000 x---0---0---0---0------0---0
Pending hart ID: 0 1 2 3 ... 30 31
Interrupt ID: 0 1 2 3 4 ... 31 32
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Enable regs: 0x2000 x---1---0---0---0-...--0---0---> hart0
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0x2080 x---0---1---0---0-...--0---0---> hart1
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0x2100 x---0---0---1---0-...--0---0---> hart2
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0x2180 x---0---0---0---1-...--0---0---> hart3
. . . . . . .
. . . . . . .
. . . . . . .
0x2f00 x---0---0---0---0-...--1---0---> hart30
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0x2f80 x---0---0---0---0-...--0---1---> hart31
<-------- word 0 -------><--- word 1 --->
This patch includes some cleanups to macros/functions.
Fixes: ebf11273220a ("riscv: andes: Rearrange Andes PLICSW to single-bit-per-hart strategy")
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Randolph <randolph@andestech.com>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019, Rick Chen <rick@andestech.com>
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*
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* U-Boot syscon driver for Andes' PLICSW
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* The PLICSW block is an Andes-specific design for software interrupts,
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* contains memory-mapped priority, enable, claim and pending registers
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* similar to RISC-V PLIC.
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*/
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#include <dm.h>
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#include <asm/global_data.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/uclass-internal.h>
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#include <regmap.h>
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#include <syscon.h>
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#include <asm/io.h>
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#include <asm/syscon.h>
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#include <cpu.h>
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#include <linux/err.h>
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/* pending register */
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#define PENDING_REG(base, hart) ((ulong)(base) + 0x1000 + 4 * (((hart) + 1) / 32))
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/* enable register */
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#define ENABLE_REG(base, hart) ((ulong)(base) + 0x2000 + (hart) * 0x80 + 4 * (((hart) + 1) / 32))
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/* claim register */
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#define CLAIM_REG(base, hart) ((ulong)(base) + 0x200004 + (hart) * 0x1000)
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/* priority register */
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#define PRIORITY_REG(base) ((ulong)(base) + PLICSW_PRIORITY_BASE)
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/* Bit 0 of PLIC-SW pending array is hardwired to zero, so we start from bit 1 */
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#define PLICSW_PRIORITY_BASE 0x4
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DECLARE_GLOBAL_DATA_PTR;
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static int enable_ipi(int hart)
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{
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u32 enable_bit = (hart + 1) % 32;
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writel(BIT(enable_bit), (void __iomem *)ENABLE_REG(gd->arch.plicsw, hart));
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return 0;
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}
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static void init_priority_ipi(int hart_num)
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{
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u32 *priority = (void *)PRIORITY_REG(gd->arch.plicsw);
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for (int i = 0; i < hart_num; i++)
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writel(1, &priority[i]);
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return;
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}
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int riscv_init_ipi(void)
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{
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int ret;
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int hart_num = 0;
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long *base = syscon_get_first_range(RISCV_SYSCON_PLICSW);
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ofnode node;
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struct udevice *dev;
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u32 reg;
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if (IS_ERR(base))
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return PTR_ERR(base);
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gd->arch.plicsw = base;
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ret = uclass_find_first_device(UCLASS_CPU, &dev);
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if (ret)
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return ret;
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if (!dev)
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return -ENODEV;
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ofnode_for_each_subnode(node, dev_ofnode(dev->parent)) {
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const char *device_type;
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device_type = ofnode_read_string(node, "device_type");
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if (!device_type)
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continue;
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if (strcmp(device_type, "cpu"))
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continue;
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/* skip if hart is marked as not available */
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if (!ofnode_is_enabled(node))
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continue;
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/* read hart ID of CPU */
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ret = ofnode_read_u32(node, "reg", ®);
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if (ret == 0)
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enable_ipi(reg);
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hart_num++;
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}
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init_priority_ipi(hart_num);
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return 0;
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}
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int riscv_send_ipi(int hart)
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{
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u32 interrupt_id = hart + 1;
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u32 pending_bit = interrupt_id % 32;
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writel(BIT(pending_bit), (void __iomem *)PENDING_REG(gd->arch.plicsw, hart));
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return 0;
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}
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int riscv_clear_ipi(int hart)
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{
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u32 source_id;
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source_id = readl((void __iomem *)CLAIM_REG(gd->arch.plicsw, hart));
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writel(source_id, (void __iomem *)CLAIM_REG(gd->arch.plicsw, hart));
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return 0;
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}
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int riscv_get_ipi(int hart, int *pending)
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{
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u32 interrupt_id = hart + 1;
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u32 pending_bit = interrupt_id % 32;
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*pending = readl((void __iomem *)PENDING_REG(gd->arch.plicsw, hart));
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*pending = !!(*pending & BIT(pending_bit));
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return 0;
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}
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static const struct udevice_id andes_plicsw_ids[] = {
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{ .compatible = "andestech,plicsw", .data = RISCV_SYSCON_PLICSW },
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{ }
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};
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U_BOOT_DRIVER(andes_plicsw) = {
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.name = "andes_plicsw",
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.id = UCLASS_SYSCON,
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.of_match = andes_plicsw_ids,
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.flags = DM_FLAG_PRE_RELOC,
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};
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