--- /dev/null
+/*
+ * Low-Level PCI Express Support for the SH7786
+ *
+ * Copyright (C) 2009 - 2011 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#define pr_fmt(fmt) "PCI: " fmt
+
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/async.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/sh_clk.h>
+#include <linux/sh_intc.h>
+#include "pcie-sh7786.h"
+#include <asm/sizes.h>
+
+struct sh7786_pcie_port {
+ struct pci_channel *hose;
+ struct clk *fclk, phy_clk;
+ unsigned int index;
+ int endpoint;
+ int link;
+};
+
+static struct sh7786_pcie_port *sh7786_pcie_ports;
+static unsigned int nr_ports;
+
+static struct sh7786_pcie_hwops {
+ int (*core_init)(void);
+ async_func_t port_init_hw;
+} *sh7786_pcie_hwops;
+
+static struct resource sh7786_pci0_resources[] = {
+ {
+ .name = "PCIe0 IO",
+ .start = 0xfd000000,
+ .end = 0xfd000000 + SZ_8M - 1,
+ .flags = IORESOURCE_IO,
+ }, {
+ .name = "PCIe0 MEM 0",
+ .start = 0xc0000000,
+ .end = 0xc0000000 + SZ_512M - 1,
+ .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
+ }, {
+ .name = "PCIe0 MEM 1",
+ .start = 0x10000000,
+ .end = 0x10000000 + SZ_64M - 1,
+ .flags = IORESOURCE_MEM,
+ }, {
+ .name = "PCIe0 MEM 2",
+ .start = 0xfe100000,
+ .end = 0xfe100000 + SZ_1M - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct resource sh7786_pci1_resources[] = {
+ {
+ .name = "PCIe1 IO",
+ .start = 0xfd800000,
+ .end = 0xfd800000 + SZ_8M - 1,
+ .flags = IORESOURCE_IO,
+ }, {
+ .name = "PCIe1 MEM 0",
+ .start = 0xa0000000,
+ .end = 0xa0000000 + SZ_512M - 1,
+ .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
+ }, {
+ .name = "PCIe1 MEM 1",
+ .start = 0x30000000,
+ .end = 0x30000000 + SZ_256M - 1,
+ .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
+ }, {
+ .name = "PCIe1 MEM 2",
+ .start = 0xfe300000,
+ .end = 0xfe300000 + SZ_1M - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct resource sh7786_pci2_resources[] = {
+ {
+ .name = "PCIe2 IO",
+ .start = 0xfc800000,
+ .end = 0xfc800000 + SZ_4M - 1,
+ .flags = IORESOURCE_IO,
+ }, {
+ .name = "PCIe2 MEM 0",
+ .start = 0x80000000,
+ .end = 0x80000000 + SZ_512M - 1,
+ .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
+ }, {
+ .name = "PCIe2 MEM 1",
+ .start = 0x20000000,
+ .end = 0x20000000 + SZ_256M - 1,
+ .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
+ }, {
+ .name = "PCIe2 MEM 2",
+ .start = 0xfcd00000,
+ .end = 0xfcd00000 + SZ_1M - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+extern struct pci_ops sh7786_pci_ops;
+
+#define DEFINE_CONTROLLER(start, idx) \
+{ \
+ .pci_ops = &sh7786_pci_ops, \
+ .resources = sh7786_pci##idx##_resources, \
+ .nr_resources = ARRAY_SIZE(sh7786_pci##idx##_resources), \
+ .reg_base = start, \
+ .mem_offset = 0, \
+ .io_offset = 0, \
+}
+
+static struct pci_channel sh7786_pci_channels[] = {
+ DEFINE_CONTROLLER(0xfe000000, 0),
+ DEFINE_CONTROLLER(0xfe200000, 1),
+ DEFINE_CONTROLLER(0xfcc00000, 2),
+};
+
+static struct clk fixed_pciexclkp = {
+ .rate = 100000000, /* 100 MHz reference clock */
+};
+
+static void sh7786_pci_fixup(struct pci_dev *dev)
+{
+ /*
+ * Prevent enumeration of root complex resources.
+ */
+ if (pci_is_root_bus(dev->bus) && dev->devfn == 0) {
+ int i;
+
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ dev->resource[i].start = 0;
+ dev->resource[i].end = 0;
+ dev->resource[i].flags = 0;
+ }
+ }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_SH7786,
+ sh7786_pci_fixup);
+
+static int __init phy_wait_for_ack(struct pci_channel *chan)
+{
+ unsigned int timeout = 100;
+
+ while (timeout--) {
+ if (pci_read_reg(chan, SH4A_PCIEPHYADRR) & (1 << BITS_ACK))
+ return 0;
+
+ udelay(100);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int __init pci_wait_for_irq(struct pci_channel *chan, unsigned int mask)
+{
+ unsigned int timeout = 100;
+
+ while (timeout--) {
+ if ((pci_read_reg(chan, SH4A_PCIEINTR) & mask) == mask)
+ return 0;
+
+ udelay(100);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static void __init phy_write_reg(struct pci_channel *chan, unsigned int addr,
+ unsigned int lane, unsigned int data)
+{
+ unsigned long phyaddr;
+
+ phyaddr = (1 << BITS_CMD) + ((lane & 0xf) << BITS_LANE) +
+ ((addr & 0xff) << BITS_ADR);
+
+ /* Set write data */
+ pci_write_reg(chan, data, SH4A_PCIEPHYDOUTR);
+ pci_write_reg(chan, phyaddr, SH4A_PCIEPHYADRR);
+
+ phy_wait_for_ack(chan);
+
+ /* Clear command */
+ pci_write_reg(chan, 0, SH4A_PCIEPHYDOUTR);
+ pci_write_reg(chan, 0, SH4A_PCIEPHYADRR);
+
+ phy_wait_for_ack(chan);
+}
+
+static int __init pcie_clk_init(struct sh7786_pcie_port *port)
+{
+ struct pci_channel *chan = port->hose;
+ struct clk *clk;
+ char fclk_name[16];
+ int ret;
+
+ /*
+ * First register the fixed clock
+ */
+ ret = clk_register(&fixed_pciexclkp);
+ if (unlikely(ret != 0))
+ return ret;
+
+ /*
+ * Grab the port's function clock, which the PHY clock depends
+ * on. clock lookups don't help us much at this point, since no
+ * dev_id is available this early. Lame.
+ */
+ snprintf(fclk_name, sizeof(fclk_name), "pcie%d_fck", port->index);
+
+ port->fclk = clk_get(NULL, fclk_name);
+ if (IS_ERR(port->fclk)) {
+ ret = PTR_ERR(port->fclk);
+ goto err_fclk;
+ }
+
+ clk_enable(port->fclk);
+
+ /*
+ * And now, set up the PHY clock
+ */
+ clk = &port->phy_clk;
+
+ memset(clk, 0, sizeof(struct clk));
+
+ clk->parent = &fixed_pciexclkp;
+ clk->enable_reg = (void __iomem *)(chan->reg_base + SH4A_PCIEPHYCTLR);
+ clk->enable_bit = BITS_CKE;
+
+ ret = sh_clk_mstp_register(clk, 1);
+ if (unlikely(ret < 0))
+ goto err_phy;
+
+ return 0;
+
+err_phy:
+ clk_disable(port->fclk);
+ clk_put(port->fclk);
+err_fclk:
+ clk_unregister(&fixed_pciexclkp);
+
+ return ret;
+}
+
+static int __init phy_init(struct sh7786_pcie_port *port)
+{
+ struct pci_channel *chan = port->hose;
+ unsigned int timeout = 100;
+
+ clk_enable(&port->phy_clk);
+
+ /* Initialize the phy */
+ phy_write_reg(chan, 0x60, 0xf, 0x004b008b);
+ phy_write_reg(chan, 0x61, 0xf, 0x00007b41);
+ phy_write_reg(chan, 0x64, 0xf, 0x00ff4f00);
+ phy_write_reg(chan, 0x65, 0xf, 0x09070907);
+ phy_write_reg(chan, 0x66, 0xf, 0x00000010);
+ phy_write_reg(chan, 0x74, 0xf, 0x0007001c);
+ phy_write_reg(chan, 0x79, 0xf, 0x01fc000d);
+ phy_write_reg(chan, 0xb0, 0xf, 0x00000610);
+
+ /* Deassert Standby */
+ phy_write_reg(chan, 0x67, 0x1, 0x00000400);
+
+ /* Disable clock */
+ clk_disable(&port->phy_clk);
+
+ while (timeout--) {
+ if (pci_read_reg(chan, SH4A_PCIEPHYSR))
+ return 0;
+
+ udelay(100);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static void __init pcie_reset(struct sh7786_pcie_port *port)
+{
+ struct pci_channel *chan = port->hose;
+
+ pci_write_reg(chan, 1, SH4A_PCIESRSTR);
+ pci_write_reg(chan, 0, SH4A_PCIETCTLR);
+ pci_write_reg(chan, 0, SH4A_PCIESRSTR);
+ pci_write_reg(chan, 0, SH4A_PCIETXVC0SR);
+}
+
+static int __init pcie_init(struct sh7786_pcie_port *port)
+{
+ struct pci_channel *chan = port->hose;
+ unsigned int data;
+ phys_addr_t memphys;
+ size_t memsize;
+ int ret, i, win;
+
+ /* Begin initialization */
+ pcie_reset(port);
+
+ /*
+ * Initial header for port config space is type 1, set the device
+ * class to match. Hardware takes care of propagating the IDSETR
+ * settings, so there is no need to bother with a quirk.
+ */
+ pci_write_reg(chan, PCI_CLASS_BRIDGE_PCI << 16, SH4A_PCIEIDSETR1);
+
+ /* Initialize default capabilities. */
+ data = pci_read_reg(chan, SH4A_PCIEEXPCAP0);
+ data &= ~(PCI_EXP_FLAGS_TYPE << 16);
+
+ if (port->endpoint)
+ data |= PCI_EXP_TYPE_ENDPOINT << 20;
+ else
+ data |= PCI_EXP_TYPE_ROOT_PORT << 20;
+
+ data |= PCI_CAP_ID_EXP;
+ pci_write_reg(chan, data, SH4A_PCIEEXPCAP0);
+
+ /* Enable data link layer active state reporting */
+ pci_write_reg(chan, PCI_EXP_LNKCAP_DLLLARC, SH4A_PCIEEXPCAP3);
+
+ /* Enable extended sync and ASPM L0s support */
+ data = pci_read_reg(chan, SH4A_PCIEEXPCAP4);
+ data &= ~PCI_EXP_LNKCTL_ASPMC;
+ data |= PCI_EXP_LNKCTL_ES | 1;
+ pci_write_reg(chan, data, SH4A_PCIEEXPCAP4);
+
+ /* Write out the physical slot number */
+ data = pci_read_reg(chan, SH4A_PCIEEXPCAP5);
+ data &= ~PCI_EXP_SLTCAP_PSN;
+ data |= (port->index + 1) << 19;
+ pci_write_reg(chan, data, SH4A_PCIEEXPCAP5);
+
+ /* Set the completion timer timeout to the maximum 32ms. */
+ data = pci_read_reg(chan, SH4A_PCIETLCTLR);
+ data &= ~0x3f00;
+ data |= 0x32 << 8;
+ pci_write_reg(chan, data, SH4A_PCIETLCTLR);
+
+ /*
+ * Set fast training sequences to the maximum 255,
+ * and enable MAC data scrambling.
+ */
+ data = pci_read_reg(chan, SH4A_PCIEMACCTLR);
+ data &= ~PCIEMACCTLR_SCR_DIS;
+ data |= (0xff << 16);
+ pci_write_reg(chan, data, SH4A_PCIEMACCTLR);
+
+ memphys = __pa(memory_start);
+ memsize = roundup_pow_of_two(memory_end - memory_start);
+
+ /*
+ * If there's more than 512MB of memory, we need to roll over to
+ * LAR1/LAMR1.
+ */
+ if (memsize > SZ_512M) {
+ pci_write_reg(chan, memphys + SZ_512M, SH4A_PCIELAR1);
+ pci_write_reg(chan, ((memsize - SZ_512M) - SZ_256) | 1,
+ SH4A_PCIELAMR1);
+ memsize = SZ_512M;
+ } else {
+ /*
+ * Otherwise just zero it out and disable it.
+ */
+ pci_write_reg(chan, 0, SH4A_PCIELAR1);
+ pci_write_reg(chan, 0, SH4A_PCIELAMR1);
+ }
+
+ /*
+ * LAR0/LAMR0 covers up to the first 512MB, which is enough to
+ * cover all of lowmem on most platforms.
+ */
+ pci_write_reg(chan, memphys, SH4A_PCIELAR0);
+ pci_write_reg(chan, (memsize - SZ_256) | 1, SH4A_PCIELAMR0);
+
+ /* Finish initialization */
+ data = pci_read_reg(chan, SH4A_PCIETCTLR);
+ data |= 0x1;
+ pci_write_reg(chan, data, SH4A_PCIETCTLR);
+
+ /* Let things settle down a bit.. */
+ mdelay(100);
+
+ /* Enable DL_Active Interrupt generation */
+ data = pci_read_reg(chan, SH4A_PCIEDLINTENR);
+ data |= PCIEDLINTENR_DLL_ACT_ENABLE;
+ pci_write_reg(chan, data, SH4A_PCIEDLINTENR);
+
+ /* Disable MAC data scrambling. */
+ data = pci_read_reg(chan, SH4A_PCIEMACCTLR);
+ data |= PCIEMACCTLR_SCR_DIS | (0xff << 16);
+ pci_write_reg(chan, data, SH4A_PCIEMACCTLR);
+
+ /*
+ * This will timeout if we don't have a link, but we permit the
+ * port to register anyways in order to support hotplug on future
+ * hardware.
+ */
+ ret = pci_wait_for_irq(chan, MASK_INT_TX_CTRL);
+
+ data = pci_read_reg(chan, SH4A_PCIEPCICONF1);
+ data &= ~(PCI_STATUS_DEVSEL_MASK << 16);
+ data |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+ (PCI_STATUS_CAP_LIST | PCI_STATUS_DEVSEL_FAST) << 16;
+ pci_write_reg(chan, data, SH4A_PCIEPCICONF1);
+
+ pci_write_reg(chan, 0x80888000, SH4A_PCIETXVC0DCTLR);
+ pci_write_reg(chan, 0x00222000, SH4A_PCIERXVC0DCTLR);
+
+ wmb();
+
+ if (ret == 0) {
+ data = pci_read_reg(chan, SH4A_PCIEMACSR);
+ printk(KERN_NOTICE "PCI: PCIe#%d x%d link detected\n",
+ port->index, (data >> 20) & 0x3f);
+ } else
+ printk(KERN_NOTICE "PCI: PCIe#%d link down\n",
+ port->index);
+
+ for (i = win = 0; i < chan->nr_resources; i++) {
+ struct resource *res = chan->resources + i;
+ resource_size_t size;
+ u32 mask;
+
+ /*
+ * We can't use the 32-bit mode windows in legacy 29-bit
+ * mode, so just skip them entirely.
+ */
+ if ((res->flags & IORESOURCE_MEM_32BIT) && __in_29bit_mode())
+ continue;
+
+ pci_write_reg(chan, 0x00000000, SH4A_PCIEPTCTLR(win));
+
+ /*
+ * The PAMR mask is calculated in units of 256kB, which
+ * keeps things pretty simple.
+ */
+ size = resource_size(res);
+ mask = (roundup_pow_of_two(size) / SZ_256K) - 1;
+ pci_write_reg(chan, mask << 18, SH4A_PCIEPAMR(win));
+
+ pci_write_reg(chan, upper_32_bits(res->start),
+ SH4A_PCIEPARH(win));
+ pci_write_reg(chan, lower_32_bits(res->start),
+ SH4A_PCIEPARL(win));
+
+ mask = MASK_PARE;
+ if (res->flags & IORESOURCE_IO)
+ mask |= MASK_SPC;
+
+ pci_write_reg(chan, mask, SH4A_PCIEPTCTLR(win));
+
+ win++;
+ }
+
+ return 0;
+}
+
+int __init pcibios_map_platform_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
+{
+ return evt2irq(0xae0);
+}
+
+static int __init sh7786_pcie_core_init(void)
+{
+ /* Return the number of ports */
+ return test_mode_pin(MODE_PIN12) ? 3 : 2;
+}
+
+static void __init sh7786_pcie_init_hw(void *data, async_cookie_t cookie)
+{
+ struct sh7786_pcie_port *port = data;
+ int ret;
+
+ /*
+ * Check if we are configured in endpoint or root complex mode,
+ * this is a fixed pin setting that applies to all PCIe ports.
+ */
+ port->endpoint = test_mode_pin(MODE_PIN11);
+
+ /*
+ * Setup clocks, needed both for PHY and PCIe registers.
+ */
+ ret = pcie_clk_init(port);
+ if (unlikely(ret < 0)) {
+ pr_err("clock initialization failed for port#%d\n",
+ port->index);
+ return;
+ }
+
+ ret = phy_init(port);
+ if (unlikely(ret < 0)) {
+ pr_err("phy initialization failed for port#%d\n",
+ port->index);
+ return;
+ }
+
+ ret = pcie_init(port);
+ if (unlikely(ret < 0)) {
+ pr_err("core initialization failed for port#%d\n",
+ port->index);
+ return;
+ }
+
+ /* In the interest of preserving device ordering, synchronize */
+ async_synchronize_cookie(cookie);
+
+ register_pci_controller(port->hose);
+}
+
+static struct sh7786_pcie_hwops sh7786_65nm_pcie_hwops __initdata = {
+ .core_init = sh7786_pcie_core_init,
+ .port_init_hw = sh7786_pcie_init_hw,
+};
+
+static int __init sh7786_pcie_init(void)
+{
+ struct clk *platclk;
+ int i;
+
+ printk(KERN_NOTICE "PCI: Starting initialization.\n");
+
+ sh7786_pcie_hwops = &sh7786_65nm_pcie_hwops;
+
+ nr_ports = sh7786_pcie_hwops->core_init();
+ BUG_ON(nr_ports > ARRAY_SIZE(sh7786_pci_channels));
+
+ if (unlikely(nr_ports == 0))
+ return -ENODEV;
+
+ sh7786_pcie_ports = kzalloc(nr_ports * sizeof(struct sh7786_pcie_port),
+ GFP_KERNEL);
+ if (unlikely(!sh7786_pcie_ports))
+ return -ENOMEM;
+
+ /*
+ * Fetch any optional platform clock associated with this block.
+ *
+ * This is a rather nasty hack for boards with spec-mocking FPGAs
+ * that have a secondary set of clocks outside of the on-chip
+ * ones that need to be accounted for before there is any chance
+ * of touching the existing MSTP bits or CPG clocks.
+ */
+ platclk = clk_get(NULL, "pcie_plat_clk");
+ if (IS_ERR(platclk)) {
+ /* Sane hardware should probably get a WARN_ON.. */
+ platclk = NULL;
+ }
+
+ clk_enable(platclk);
+
+ printk(KERN_NOTICE "PCI: probing %d ports.\n", nr_ports);
+
+ for (i = 0; i < nr_ports; i++) {
+ struct sh7786_pcie_port *port = sh7786_pcie_ports + i;
+
+ port->index = i;
+ port->hose = sh7786_pci_channels + i;
+ port->hose->io_map_base = port->hose->resources[0].start;
+
+ async_schedule(sh7786_pcie_hwops->port_init_hw, port);
+ }
+
+ async_synchronize_full();
+
+ return 0;
+}
+arch_initcall(sh7786_pcie_init);
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