diff options
author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/sh/drivers/pci/pcie-sh7786.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/sh/drivers/pci/pcie-sh7786.c')
-rw-r--r-- | kernel/arch/sh/drivers/pci/pcie-sh7786.c | 579 |
1 files changed, 579 insertions, 0 deletions
diff --git a/kernel/arch/sh/drivers/pci/pcie-sh7786.c b/kernel/arch/sh/drivers/pci/pcie-sh7786.c new file mode 100644 index 000000000..a162a7f86 --- /dev/null +++ b/kernel/arch/sh/drivers/pci/pcie-sh7786.c @@ -0,0 +1,579 @@ +/* + * 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); |