121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCIe driver for Renesas R-Car SoCs
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* Copyright (C) 2014-2020 Renesas Electronics Europe Ltd
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*
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* Author: Phil Edworthy <phil.edworthy@renesas.com>
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*/
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include "pcie-rcar.h"
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void rcar_pci_write_reg(struct rcar_pcie *pcie, u32 val, unsigned int reg)
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{
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writel(val, pcie->base + reg);
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}
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u32 rcar_pci_read_reg(struct rcar_pcie *pcie, unsigned int reg)
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{
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return readl(pcie->base + reg);
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}
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void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
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{
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unsigned int shift = BITS_PER_BYTE * (where & 3);
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u32 val = rcar_pci_read_reg(pcie, where & ~3);
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val &= ~(mask << shift);
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val |= data << shift;
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rcar_pci_write_reg(pcie, val, where & ~3);
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}
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int rcar_pcie_wait_for_phyrdy(struct rcar_pcie *pcie)
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{
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unsigned int timeout = 10;
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while (timeout--) {
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if (rcar_pci_read_reg(pcie, PCIEPHYSR) & PHYRDY)
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return 0;
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msleep(5);
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}
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return -ETIMEDOUT;
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}
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int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie)
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{
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unsigned int timeout = 10000;
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while (timeout--) {
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if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
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return 0;
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udelay(5);
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cpu_relax();
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}
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return -ETIMEDOUT;
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}
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void rcar_pcie_set_outbound(struct rcar_pcie *pcie, int win,
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struct resource_entry *window)
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{
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/* Setup PCIe address space mappings for each resource */
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struct resource *res = window->res;
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resource_size_t res_start;
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resource_size_t size;
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u32 mask;
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rcar_pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win));
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/*
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* The PAMR mask is calculated in units of 128Bytes, which
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* keeps things pretty simple.
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*/
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size = resource_size(res);
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if (size > 128)
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mask = (roundup_pow_of_two(size) / SZ_128) - 1;
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else
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mask = 0x0;
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rcar_pci_write_reg(pcie, mask << 7, PCIEPAMR(win));
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if (res->flags & IORESOURCE_IO)
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res_start = pci_pio_to_address(res->start) - window->offset;
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else
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res_start = res->start - window->offset;
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rcar_pci_write_reg(pcie, upper_32_bits(res_start), PCIEPAUR(win));
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rcar_pci_write_reg(pcie, lower_32_bits(res_start) & ~0x7F,
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PCIEPALR(win));
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/* First resource is for IO */
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mask = PAR_ENABLE;
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if (res->flags & IORESOURCE_IO)
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mask |= IO_SPACE;
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rcar_pci_write_reg(pcie, mask, PCIEPTCTLR(win));
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}
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void rcar_pcie_set_inbound(struct rcar_pcie *pcie, u64 cpu_addr,
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u64 pci_addr, u64 flags, int idx, bool host)
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{
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/*
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* Set up 64-bit inbound regions as the range parser doesn't
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* distinguish between 32 and 64-bit types.
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*/
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if (host)
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rcar_pci_write_reg(pcie, lower_32_bits(pci_addr),
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PCIEPRAR(idx));
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rcar_pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx));
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rcar_pci_write_reg(pcie, flags, PCIELAMR(idx));
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if (host)
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rcar_pci_write_reg(pcie, upper_32_bits(pci_addr),
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PCIEPRAR(idx + 1));
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rcar_pci_write_reg(pcie, upper_32_bits(cpu_addr), PCIELAR(idx + 1));
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rcar_pci_write_reg(pcie, 0, PCIELAMR(idx + 1));
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}
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