1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2013 Imagination Technologies
4 * Author: Paul Burton <paul.burton@mips.com>
10 #include <pci_msc01.h>
13 #define PCI_ACCESS_READ 0
14 #define PCI_ACCESS_WRITE 1
16 struct msc01_pci_controller {
17 struct pci_controller hose;
21 static inline struct msc01_pci_controller *
22 hose_to_msc01(struct pci_controller *hose)
24 return container_of(hose, struct msc01_pci_controller, hose);
27 static int msc01_config_access(struct msc01_pci_controller *msc01,
28 unsigned char access_type, pci_dev_t bdf,
31 const u32 aborts = MSC01_PCI_INTSTAT_MA_MSK | MSC01_PCI_INTSTAT_TA_MSK;
32 void *intstat = msc01->base + MSC01_PCI_INTSTAT_OFS;
33 void *cfgdata = msc01->base + MSC01_PCI_CFGDATA_OFS;
34 unsigned int bus = PCI_BUS(bdf);
35 unsigned int dev = PCI_DEV(bdf);
36 unsigned int devfn = PCI_DEV(bdf) << 3 | PCI_FUNC(bdf);
38 /* clear abort status */
39 __raw_writel(aborts, intstat);
42 __raw_writel((bus << MSC01_PCI_CFGADDR_BNUM_SHF) |
43 (dev << MSC01_PCI_CFGADDR_DNUM_SHF) |
44 (devfn << MSC01_PCI_CFGADDR_FNUM_SHF) |
45 ((where / 4) << MSC01_PCI_CFGADDR_RNUM_SHF),
46 msc01->base + MSC01_PCI_CFGADDR_OFS);
49 if (access_type == PCI_ACCESS_WRITE)
50 __raw_writel(*data, cfgdata);
52 *data = __raw_readl(cfgdata);
54 /* check for aborts */
55 if (__raw_readl(intstat) & aborts) {
56 /* clear abort status */
57 __raw_writel(aborts, intstat);
64 static int msc01_read_config_dword(struct pci_controller *hose, pci_dev_t dev,
65 int where, u32 *value)
67 struct msc01_pci_controller *msc01 = hose_to_msc01(hose);
70 return msc01_config_access(msc01, PCI_ACCESS_READ, dev, where, value);
73 static int msc01_write_config_dword(struct pci_controller *hose, pci_dev_t dev,
76 struct msc01_pci_controller *gt = hose_to_msc01(hose);
79 return msc01_config_access(gt, PCI_ACCESS_WRITE, dev, where, &data);
82 void msc01_pci_init(void *base, unsigned long sys_bus, unsigned long sys_phys,
83 unsigned long sys_size, unsigned long mem_bus,
84 unsigned long mem_phys, unsigned long mem_size,
85 unsigned long io_bus, unsigned long io_phys,
86 unsigned long io_size)
88 static struct msc01_pci_controller global_msc01;
89 struct msc01_pci_controller *msc01;
90 struct pci_controller *hose;
92 msc01 = &global_msc01;
97 hose->first_busno = 0;
100 /* System memory space */
101 pci_set_region(&hose->regions[0], sys_bus, sys_phys, sys_size,
102 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
104 /* PCI memory space */
105 pci_set_region(&hose->regions[1], mem_bus, mem_phys, mem_size,
109 pci_set_region(&hose->regions[2], io_bus, io_phys, io_size,
112 hose->region_count = 3;
115 pci_hose_read_config_byte_via_dword,
116 pci_hose_read_config_word_via_dword,
117 msc01_read_config_dword,
118 pci_hose_write_config_byte_via_dword,
119 pci_hose_write_config_word_via_dword,
120 msc01_write_config_dword);
122 pci_register_hose(hose);
123 hose->last_busno = pci_hose_scan(hose);