356 lines
8.6 KiB
C
356 lines
8.6 KiB
C
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/*
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* Low-Level PCI Express Support for the SH7786
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*
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* Copyright (C) 2009 Paul Mundt
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*
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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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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include "pcie-sh7786.h"
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#include <asm/sizes.h>
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struct sh7786_pcie_port {
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struct pci_channel *hose;
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unsigned int index;
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int endpoint;
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int link;
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};
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static struct sh7786_pcie_port *sh7786_pcie_ports;
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static unsigned int nr_ports;
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static struct sh7786_pcie_hwops {
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int (*core_init)(void);
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int (*port_init_hw)(struct sh7786_pcie_port *port);
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} *sh7786_pcie_hwops;
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static struct resource sh7786_pci_32bit_mem_resources[] = {
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{
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.name = "pci0_mem",
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.start = SH4A_PCIMEM_BASEA,
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.end = SH4A_PCIMEM_BASEA + SZ_64M - 1,
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.flags = IORESOURCE_MEM,
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}, {
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.name = "pci1_mem",
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.start = SH4A_PCIMEM_BASEA1,
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.end = SH4A_PCIMEM_BASEA1 + SZ_64M - 1,
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.flags = IORESOURCE_MEM,
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}, {
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.name = "pci2_mem",
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.start = SH4A_PCIMEM_BASEA2,
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.end = SH4A_PCIMEM_BASEA2 + SZ_64M - 1,
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.flags = IORESOURCE_MEM,
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},
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};
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static struct resource sh7786_pci_29bit_mem_resource = {
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.start = SH4A_PCIMEM_BASE,
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.end = SH4A_PCIMEM_BASE + SZ_64M - 1,
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.flags = IORESOURCE_MEM,
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};
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static struct resource sh7786_pci_io_resources[] = {
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{
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.name = "pci0_io",
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.start = SH4A_PCIIO_BASE,
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.end = SH4A_PCIIO_BASE + SZ_8M - 1,
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.flags = IORESOURCE_IO,
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}, {
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.name = "pci1_io",
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.start = SH4A_PCIIO_BASE1,
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.end = SH4A_PCIIO_BASE1 + SZ_8M - 1,
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.flags = IORESOURCE_IO,
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}, {
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.name = "pci2_io",
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.start = SH4A_PCIIO_BASE2,
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.end = SH4A_PCIIO_BASE2 + SZ_4M - 1,
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.flags = IORESOURCE_IO,
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},
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};
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extern struct pci_ops sh7786_pci_ops;
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#define DEFINE_CONTROLLER(start, idx) \
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{ \
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.pci_ops = &sh7786_pci_ops, \
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.reg_base = start, \
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/* mem_resource filled in at probe time */ \
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.mem_offset = 0, \
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.io_resource = &sh7786_pci_io_resources[idx], \
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.io_offset = 0, \
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}
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static struct pci_channel sh7786_pci_channels[] = {
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DEFINE_CONTROLLER(0xfe000000, 0),
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DEFINE_CONTROLLER(0xfe200000, 1),
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DEFINE_CONTROLLER(0xfcc00000, 2),
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};
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static int phy_wait_for_ack(struct pci_channel *chan)
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{
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unsigned int timeout = 100;
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while (timeout--) {
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if (pci_read_reg(chan, SH4A_PCIEPHYADRR) & (1 << BITS_ACK))
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return 0;
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udelay(100);
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}
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return -ETIMEDOUT;
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}
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static int pci_wait_for_irq(struct pci_channel *chan, unsigned int mask)
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{
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unsigned int timeout = 100;
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while (timeout--) {
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if ((pci_read_reg(chan, SH4A_PCIEINTR) & mask) == mask)
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return 0;
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udelay(100);
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}
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return -ETIMEDOUT;
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}
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static void phy_write_reg(struct pci_channel *chan, unsigned int addr,
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unsigned int lane, unsigned int data)
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{
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unsigned long phyaddr, ctrl;
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phyaddr = (1 << BITS_CMD) + ((lane & 0xf) << BITS_LANE) +
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((addr & 0xff) << BITS_ADR);
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/* Enable clock */
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ctrl = pci_read_reg(chan, SH4A_PCIEPHYCTLR);
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ctrl |= (1 << BITS_CKE);
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pci_write_reg(chan, ctrl, SH4A_PCIEPHYCTLR);
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/* Set write data */
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pci_write_reg(chan, data, SH4A_PCIEPHYDOUTR);
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pci_write_reg(chan, phyaddr, SH4A_PCIEPHYADRR);
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phy_wait_for_ack(chan);
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/* Clear command */
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pci_write_reg(chan, 0, SH4A_PCIEPHYADRR);
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phy_wait_for_ack(chan);
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/* Disable clock */
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ctrl = pci_read_reg(chan, SH4A_PCIEPHYCTLR);
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ctrl &= ~(1 << BITS_CKE);
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pci_write_reg(chan, ctrl, SH4A_PCIEPHYCTLR);
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}
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static int phy_init(struct pci_channel *chan)
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{
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unsigned int timeout = 100;
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/* Initialize the phy */
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phy_write_reg(chan, 0x60, 0xf, 0x004b008b);
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phy_write_reg(chan, 0x61, 0xf, 0x00007b41);
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phy_write_reg(chan, 0x64, 0xf, 0x00ff4f00);
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phy_write_reg(chan, 0x65, 0xf, 0x09070907);
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phy_write_reg(chan, 0x66, 0xf, 0x00000010);
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phy_write_reg(chan, 0x74, 0xf, 0x0007001c);
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phy_write_reg(chan, 0x79, 0xf, 0x01fc000d);
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/* Deassert Standby */
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phy_write_reg(chan, 0x67, 0xf, 0x00000400);
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while (timeout--) {
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if (pci_read_reg(chan, SH4A_PCIEPHYSR))
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return 0;
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udelay(100);
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}
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return -ETIMEDOUT;
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}
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static int pcie_init(struct sh7786_pcie_port *port)
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{
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struct pci_channel *chan = port->hose;
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unsigned int data;
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int ret;
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/* Begin initialization */
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pci_write_reg(chan, 0, SH4A_PCIETCTLR);
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/* Initialize as type1. */
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data = pci_read_reg(chan, SH4A_PCIEPCICONF3);
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data &= ~(0x7f << 16);
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data |= PCI_HEADER_TYPE_BRIDGE << 16;
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pci_write_reg(chan, data, SH4A_PCIEPCICONF3);
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/* Initialize default capabilities. */
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data = pci_read_reg(chan, SH4A_PCIEEXPCAP0);
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data &= ~(PCI_EXP_FLAGS_TYPE << 16);
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if (port->endpoint)
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data |= PCI_EXP_TYPE_ENDPOINT << 20;
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else
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data |= PCI_EXP_TYPE_ROOT_PORT << 20;
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data |= PCI_CAP_ID_EXP;
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pci_write_reg(chan, data, SH4A_PCIEEXPCAP0);
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/* Enable x4 link width and extended sync. */
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data = pci_read_reg(chan, SH4A_PCIEEXPCAP4);
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data &= ~(PCI_EXP_LNKSTA_NLW << 16);
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data |= (1 << 22) | PCI_EXP_LNKCTL_ES;
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pci_write_reg(chan, data, SH4A_PCIEEXPCAP4);
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/* Set the completion timer timeout to the maximum 32ms. */
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data = pci_read_reg(chan, SH4A_PCIETLCTLR);
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data &= ~0xffff;
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data |= 0x32 << 8;
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pci_write_reg(chan, data, SH4A_PCIETLCTLR);
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/*
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* Set fast training sequences to the maximum 255,
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* and enable MAC data scrambling.
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*/
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data = pci_read_reg(chan, SH4A_PCIEMACCTLR);
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data &= ~PCIEMACCTLR_SCR_DIS;
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data |= (0xff << 16);
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pci_write_reg(chan, data, SH4A_PCIEMACCTLR);
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/* Finish initialization */
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data = pci_read_reg(chan, SH4A_PCIETCTLR);
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data |= 0x1;
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pci_write_reg(chan, data, SH4A_PCIETCTLR);
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/* Enable DL_Active Interrupt generation */
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data = pci_read_reg(chan, SH4A_PCIEDLINTENR);
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data |= PCIEDLINTENR_DLL_ACT_ENABLE;
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pci_write_reg(chan, data, SH4A_PCIEDLINTENR);
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/* Disable MAC data scrambling. */
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data = pci_read_reg(chan, SH4A_PCIEMACCTLR);
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data |= PCIEMACCTLR_SCR_DIS | (0xff << 16);
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pci_write_reg(chan, data, SH4A_PCIEMACCTLR);
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ret = pci_wait_for_irq(chan, MASK_INT_TX_CTRL);
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if (unlikely(ret != 0))
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return -ENODEV;
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pci_write_reg(chan, 0x00100007, SH4A_PCIEPCICONF1);
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pci_write_reg(chan, 0x80888000, SH4A_PCIETXVC0DCTLR);
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pci_write_reg(chan, 0x00222000, SH4A_PCIERXVC0DCTLR);
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pci_write_reg(chan, 0x000050A0, SH4A_PCIEEXPCAP2);
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wmb();
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data = pci_read_reg(chan, SH4A_PCIEMACSR);
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printk(KERN_NOTICE "PCI: PCIe#%d link width %d\n",
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port->index, (data >> 20) & 0x3f);
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pci_write_reg(chan, 0x007c0000, SH4A_PCIEPAMR0);
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pci_write_reg(chan, 0x00000000, SH4A_PCIEPARH0);
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pci_write_reg(chan, 0x00000000, SH4A_PCIEPARL0);
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pci_write_reg(chan, 0x80000100, SH4A_PCIEPTCTLR0);
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pci_write_reg(chan, 0x03fc0000, SH4A_PCIEPAMR2);
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pci_write_reg(chan, 0x00000000, SH4A_PCIEPARH2);
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pci_write_reg(chan, 0x00000000, SH4A_PCIEPARL2);
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pci_write_reg(chan, 0x80000000, SH4A_PCIEPTCTLR2);
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return 0;
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}
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int __init pcibios_map_platform_irq(struct pci_dev *pdev, u8 slot, u8 pin)
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{
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return 71;
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}
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static int sh7786_pcie_core_init(void)
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{
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/* Return the number of ports */
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return test_mode_pin(MODE_PIN12) ? 3 : 2;
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}
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static int __devinit sh7786_pcie_init_hw(struct sh7786_pcie_port *port)
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{
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int ret;
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ret = phy_init(port->hose);
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if (unlikely(ret < 0))
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return ret;
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/*
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* Check if we are configured in endpoint or root complex mode,
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* this is a fixed pin setting that applies to all PCIe ports.
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*/
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port->endpoint = test_mode_pin(MODE_PIN11);
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ret = pcie_init(port);
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if (unlikely(ret < 0))
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return ret;
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register_pci_controller(port->hose);
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return 0;
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}
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static struct sh7786_pcie_hwops sh7786_65nm_pcie_hwops __initdata = {
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.core_init = sh7786_pcie_core_init,
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.port_init_hw = sh7786_pcie_init_hw,
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};
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static int __init sh7786_pcie_init(void)
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{
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int ret = 0, i;
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printk(KERN_NOTICE "PCI: Starting intialization.\n");
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sh7786_pcie_hwops = &sh7786_65nm_pcie_hwops;
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nr_ports = sh7786_pcie_hwops->core_init();
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BUG_ON(nr_ports > ARRAY_SIZE(sh7786_pci_channels));
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if (unlikely(nr_ports == 0))
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return -ENODEV;
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sh7786_pcie_ports = kzalloc(nr_ports * sizeof(struct sh7786_pcie_port),
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GFP_KERNEL);
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if (unlikely(!sh7786_pcie_ports))
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return -ENOMEM;
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printk(KERN_NOTICE "PCI: probing %d ports.\n", nr_ports);
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for (i = 0; i < nr_ports; i++) {
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struct sh7786_pcie_port *port = sh7786_pcie_ports + i;
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port->index = i;
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port->hose = sh7786_pci_channels + i;
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port->hose->io_map_base = port->hose->io_resource->start;
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/*
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* Check if we are booting in 29 or 32-bit mode
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*
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* 32-bit mode provides each controller with its own
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* memory window, while 29-bit mode uses a shared one.
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*/
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port->hose->mem_resource = test_mode_pin(MODE_PIN10) ?
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&sh7786_pci_32bit_mem_resources[i] :
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&sh7786_pci_29bit_mem_resource;
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ret |= sh7786_pcie_hwops->port_init_hw(port);
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}
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if (unlikely(ret))
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return ret;
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return 0;
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}
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arch_initcall(sh7786_pcie_init);
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