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atheros: ar2315-pci: rework host controller initialization

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Explicitly configure PCI host controller, and do not expose it to PCI
subsystem. The PCI host controller acts as a usual PCI device connected
to the bus, but its configuration as a usual PCI device is senseless,
since the host controller provide access to _internal_ memory space for
_external_ device.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>

SVN-Revision: 42500
This commit is contained in:
John Crispin 2014-09-12 06:52:55 +00:00
parent 37d2445fcb
commit 0f645cbd83
1 changed files with 47 additions and 21 deletions
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68
target/linux/atheros/patches-3.14/105-ar2315_pci.patch
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@ -7,7 +7,7 @@
+obj-$(CONFIG_ATHEROS_AR2315_PCI) += pci.o
--- /dev/null
+++ b/arch/mips/ar231x/pci.c
@@ -0,0 +1,254 @@
@@ -0,0 +1,280 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
@ -65,6 +65,9 @@
+#define AR2315_MEM_SIZE 0x00ffffffUL
+#define AR2315_IO_SIZE 0x00007fffUL
+
+#define AR2315_PCI_HOST_SLOT 3
+#define AR2315_PCI_HOST_DEVID ((0xff18 << 16) | PCI_VENDOR_ID_ATHEROS)
+
+static unsigned long configspace;
+
+static int ar2315_pci_cfg_access(int devfn, int where, int size, u32 *ptr,
@ -76,9 +79,6 @@
+ int err = 0;
+ u32 addr;
+
+ if (((dev != 0) && (dev != 3)) || (func > 2))
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ /* Select Configuration access */
+ ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, 0, AR2315_PCIMISC_CFG_SEL);
+ mb();
@ -116,15 +116,31 @@
+ return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+}
+
+static inline int ar2315_pci_local_cfg_rd(unsigned devfn, int where, u32 *val)
+{
+ return ar2315_pci_cfg_access(devfn, where, sizeof(u32), val, false);
+}
+
+static inline int ar2315_pci_local_cfg_wr(unsigned devfn, int where, u32 val)
+{
+ return ar2315_pci_cfg_access(devfn, where, sizeof(u32), &val, true);
+}
+
+static int ar2315_pci_cfg_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *value)
+{
+ if ((PCI_SLOT(devfn) != 0) || (PCI_FUNC(devfn) > 2))
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ return ar2315_pci_cfg_access(devfn, where, size, value, 0);
+}
+
+static int ar2315_pci_cfg_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 value)
+{
+ if ((PCI_SLOT(devfn) != 0) || (PCI_FUNC(devfn) > 2))
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ return ar2315_pci_cfg_access(devfn, where, size, &value, 1);
+}
+
@ -178,33 +194,35 @@
+ return 0;
+}
+
+static void
+ar2315_pci_fixup(struct pci_dev *dev)
+static int ar2315_pci_host_setup(void)
+{
+ unsigned int devfn = dev->devfn;
+ unsigned devfn = PCI_DEVFN(AR2315_PCI_HOST_SLOT, 0);
+ int res;
+ u32 id;
+
+ if (dev->bus->number != 0)
+ return;
+ res = ar2315_pci_local_cfg_rd(devfn, PCI_VENDOR_ID, &id);
+ if (res != PCIBIOS_SUCCESSFUL || id != AR2315_PCI_HOST_DEVID)
+ return -ENODEV;
+
+ /* Only fix up the PCI host settings */
+ if ((PCI_SLOT(devfn) != 3) || (PCI_FUNC(devfn) != 0))
+ return;
+ /* Program MBARs */
+ ar2315_pci_local_cfg_wr(devfn, PCI_BASE_ADDRESS_0, HOST_PCI_MBAR0);
+ ar2315_pci_local_cfg_wr(devfn, PCI_BASE_ADDRESS_1, HOST_PCI_MBAR1);
+ ar2315_pci_local_cfg_wr(devfn, PCI_BASE_ADDRESS_2, HOST_PCI_MBAR2);
+
+ /* Fix up MBARs */
+ pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, HOST_PCI_MBAR0);
+ pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, HOST_PCI_MBAR1);
+ pci_write_config_dword(dev, PCI_BASE_ADDRESS_2, HOST_PCI_MBAR2);
+ pci_write_config_dword(dev, PCI_COMMAND, PCI_COMMAND_MEMORY |
+ PCI_COMMAND_MASTER | PCI_COMMAND_SPECIAL |
+ PCI_COMMAND_INVALIDATE | PCI_COMMAND_PARITY |
+ PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK);
+ /* Run */
+ ar2315_pci_local_cfg_wr(devfn, PCI_COMMAND, PCI_COMMAND_MEMORY |
+ PCI_COMMAND_MASTER | PCI_COMMAND_SPECIAL |
+ PCI_COMMAND_INVALIDATE | PCI_COMMAND_PARITY |
+ PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK);
+
+ return 0;
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, ar2315_pci_fixup);
+
+static int __init
+ar2315_pci_init(void)
+{
+ u32 reg;
+ int res;
+
+ if (ar231x_devtype != DEV_TYPE_AR2315)
+ return -ENODEV;
@ -256,9 +274,17 @@
+ ioport_resource.start = 0x10000000;
+ ioport_resource.end = 0xffffffff;
+
+ res = ar2315_pci_host_setup();
+ if (res)
+ goto error;
+
+ register_pci_controller(&ar2315_pci_controller);
+
+ return 0;
+
+error:
+ iounmap((void __iomem *)configspace);
+ return res;
+}
+
+arch_initcall(ar2315_pci_init);