arch/mips/pci/pci-rt2880.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Ralink RT288x SoC PCI register definitions
   4  *
   5  *  Copyright (C) 2009 John Crispin <john@phrozen.org>
   6  *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
   7  *
   8  *  Parts of this file are based on Ralink's 2.6.21 BSP
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/types.h>
  13 #include <linux/pci.h>
  14 #include <linux/io.h>
  15 #include <linux/init.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/of_irq.h>
  18 #include <linux/of_pci.h>
  19
  20 #include <asm/mach-ralink/rt288x.h>
  21
  22 #define RT2880_PCI_BASE         0x00440000
  23 #define RT288X_CPU_IRQ_PCI      4
  24
  25 #define RT2880_PCI_MEM_BASE     0x20000000
  26 #define RT2880_PCI_MEM_SIZE     0x10000000
  27 #define RT2880_PCI_IO_BASE      0x00460000
  28 #define RT2880_PCI_IO_SIZE      0x00010000
  29
  30 #define RT2880_PCI_REG_PCICFG_ADDR      0x00
  31 #define RT2880_PCI_REG_PCIMSK_ADDR      0x0c
  32 #define RT2880_PCI_REG_BAR0SETUP_ADDR   0x10
  33 #define RT2880_PCI_REG_IMBASEBAR0_ADDR  0x18
  34 #define RT2880_PCI_REG_CONFIG_ADDR      0x20
  35 #define RT2880_PCI_REG_CONFIG_DATA      0x24
  36 #define RT2880_PCI_REG_MEMBASE          0x28
  37 #define RT2880_PCI_REG_IOBASE           0x2c
  38 #define RT2880_PCI_REG_ID               0x30
  39 #define RT2880_PCI_REG_CLASS            0x34
  40 #define RT2880_PCI_REG_SUBID            0x38
  41 #define RT2880_PCI_REG_ARBCTL           0x80
  42
  43 static void __iomem *rt2880_pci_base;
  44 static DEFINE_SPINLOCK(rt2880_pci_lock);
  45
  46 static u32 rt2880_pci_reg_read(u32 reg)
  47 {
  48         return readl(rt2880_pci_base + reg);
  49 }
  50
  51 static void rt2880_pci_reg_write(u32 val, u32 reg)
  52 {
  53         writel(val, rt2880_pci_base + reg);
  54 }
  55
  56 static inline u32 rt2880_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
  57                                          unsigned int func, unsigned int where)
  58 {
  59         return ((bus << 16) | (slot << 11) | (func << 8) | (where & 0xfc) |
  60                 0x80000000);
  61 }
  62
  63 static int rt2880_pci_config_read(struct pci_bus *bus, unsigned int devfn,
  64                                   int where, int size, u32 *val)
  65 {
  66         unsigned long flags;
  67         u32 address;
  68         u32 data;
  69
  70         address = rt2880_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
  71                                          PCI_FUNC(devfn), where);
  72
  73         spin_lock_irqsave(&rt2880_pci_lock, flags);
  74         rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
  75         data = rt2880_pci_reg_read(RT2880_PCI_REG_CONFIG_DATA);
  76         spin_unlock_irqrestore(&rt2880_pci_lock, flags);
  77
  78         switch (size) {
  79         case 1:
  80                 *val = (data >> ((where & 3) << 3)) & 0xff;
  81                 break;
  82         case 2:
  83                 *val = (data >> ((where & 3) << 3)) & 0xffff;
  84                 break;
  85         case 4:
  86                 *val = data;
  87                 break;
  88         }
  89
  90         return PCIBIOS_SUCCESSFUL;
  91 }
  92
  93 static int rt2880_pci_config_write(struct pci_bus *bus, unsigned int devfn,
  94                                    int where, int size, u32 val)
  95 {
  96         unsigned long flags;
  97         u32 address;
  98         u32 data;
  99
 100         address = rt2880_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
 101                                          PCI_FUNC(devfn), where);
 102
 103         spin_lock_irqsave(&rt2880_pci_lock, flags);
 104         rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
 105         data = rt2880_pci_reg_read(RT2880_PCI_REG_CONFIG_DATA);
 106
 107         switch (size) {
 108         case 1:
 109                 data = (data & ~(0xff << ((where & 3) << 3))) |
 110                        (val << ((where & 3) << 3));
 111                 break;
 112         case 2:
 113                 data = (data & ~(0xffff << ((where & 3) << 3))) |
 114                        (val << ((where & 3) << 3));
 115                 break;
 116         case 4:
 117                 data = val;
 118                 break;
 119         }
 120
 121         rt2880_pci_reg_write(data, RT2880_PCI_REG_CONFIG_DATA);
 122         spin_unlock_irqrestore(&rt2880_pci_lock, flags);
 123
 124         return PCIBIOS_SUCCESSFUL;
 125 }
 126
 127 static struct pci_ops rt2880_pci_ops = {
 128         .read   = rt2880_pci_config_read,
 129         .write  = rt2880_pci_config_write,
 130 };
 131
 132 static struct resource rt2880_pci_mem_resource = {
 133         .name   = "PCI MEM space",
 134         .start  = RT2880_PCI_MEM_BASE,
 135         .end    = RT2880_PCI_MEM_BASE + RT2880_PCI_MEM_SIZE - 1,
 136         .flags  = IORESOURCE_MEM,
 137 };
 138
 139 static struct resource rt2880_pci_io_resource = {
 140         .name   = "PCI IO space",
 141         .start  = RT2880_PCI_IO_BASE,
 142         .end    = RT2880_PCI_IO_BASE + RT2880_PCI_IO_SIZE - 1,
 143         .flags  = IORESOURCE_IO,
 144 };
 145
 146 static struct pci_controller rt2880_pci_controller = {
 147         .pci_ops        = &rt2880_pci_ops,
 148         .mem_resource   = &rt2880_pci_mem_resource,
 149         .io_resource    = &rt2880_pci_io_resource,
 150 };
 151
 152 static inline u32 rt2880_pci_read_u32(unsigned long reg)
 153 {
 154         unsigned long flags;
 155         u32 address;
 156         u32 ret;
 157
 158         address = rt2880_pci_get_cfgaddr(0, 0, 0, reg);
 159
 160         spin_lock_irqsave(&rt2880_pci_lock, flags);
 161         rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
 162         ret = rt2880_pci_reg_read(RT2880_PCI_REG_CONFIG_DATA);
 163         spin_unlock_irqrestore(&rt2880_pci_lock, flags);
 164
 165         return ret;
 166 }
 167
 168 static inline void rt2880_pci_write_u32(unsigned long reg, u32 val)
 169 {
 170         unsigned long flags;
 171         u32 address;
 172
 173         address = rt2880_pci_get_cfgaddr(0, 0, 0, reg);
 174
 175         spin_lock_irqsave(&rt2880_pci_lock, flags);
 176         rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
 177         rt2880_pci_reg_write(val, RT2880_PCI_REG_CONFIG_DATA);
 178         spin_unlock_irqrestore(&rt2880_pci_lock, flags);
 179 }
 180
 181 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 182 {
 183         u16 cmd;
 184         int irq = -1;
 185
 186         if (dev->bus->number != 0)
 187                 return irq;
 188
 189         switch (PCI_SLOT(dev->devfn)) {
 190         case 0x00:
 191                 rt2880_pci_write_u32(PCI_BASE_ADDRESS_0, 0x08000000);
 192                 (void) rt2880_pci_read_u32(PCI_BASE_ADDRESS_0);
 193                 break;
 194         case 0x11:
 195                 irq = RT288X_CPU_IRQ_PCI;
 196                 break;
 197         default:
 198                 pr_err("%s:%s[%d] trying to alloc unknown pci irq\n",
 199                        __FILE__, __func__, __LINE__);
 200                 BUG();
 201                 break;
 202         }
 203
 204         pci_write_config_byte((struct pci_dev *) dev,
 205                 PCI_CACHE_LINE_SIZE, 0x14);
 206         pci_write_config_byte((struct pci_dev *) dev, PCI_LATENCY_TIMER, 0xFF);
 207         pci_read_config_word((struct pci_dev *) dev, PCI_COMMAND, &cmd);
 208         cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
 209                 PCI_COMMAND_INVALIDATE | PCI_COMMAND_FAST_BACK |
 210                 PCI_COMMAND_SERR | PCI_COMMAND_WAIT | PCI_COMMAND_PARITY;
 211         pci_write_config_word((struct pci_dev *) dev, PCI_COMMAND, cmd);
 212         pci_write_config_byte((struct pci_dev *) dev, PCI_INTERRUPT_LINE,
 213                               dev->irq);
 214         return irq;
 215 }
 216
 217 static int rt288x_pci_probe(struct platform_device *pdev)
 218 {
 219         void __iomem *io_map_base;
 220
 221         rt2880_pci_base = ioremap(RT2880_PCI_BASE, PAGE_SIZE);
 222
 223         io_map_base = ioremap(RT2880_PCI_IO_BASE, RT2880_PCI_IO_SIZE);
 224         rt2880_pci_controller.io_map_base = (unsigned long) io_map_base;
 225         set_io_port_base((unsigned long) io_map_base);
 226
 227         ioport_resource.start = RT2880_PCI_IO_BASE;
 228         ioport_resource.end = RT2880_PCI_IO_BASE + RT2880_PCI_IO_SIZE - 1;
 229
 230         rt2880_pci_reg_write(0, RT2880_PCI_REG_PCICFG_ADDR);
 231         udelay(1);
 232
 233         rt2880_pci_reg_write(0x79, RT2880_PCI_REG_ARBCTL);
 234         rt2880_pci_reg_write(0x07FF0001, RT2880_PCI_REG_BAR0SETUP_ADDR);
 235         rt2880_pci_reg_write(RT2880_PCI_MEM_BASE, RT2880_PCI_REG_MEMBASE);
 236         rt2880_pci_reg_write(RT2880_PCI_IO_BASE, RT2880_PCI_REG_IOBASE);
 237         rt2880_pci_reg_write(0x08000000, RT2880_PCI_REG_IMBASEBAR0_ADDR);
 238         rt2880_pci_reg_write(0x08021814, RT2880_PCI_REG_ID);
 239         rt2880_pci_reg_write(0x00800001, RT2880_PCI_REG_CLASS);
 240         rt2880_pci_reg_write(0x28801814, RT2880_PCI_REG_SUBID);
 241         rt2880_pci_reg_write(0x000c0000, RT2880_PCI_REG_PCIMSK_ADDR);
 242
 243         rt2880_pci_write_u32(PCI_BASE_ADDRESS_0, 0x08000000);
 244         (void) rt2880_pci_read_u32(PCI_BASE_ADDRESS_0);
 245
 246         rt2880_pci_controller.of_node = pdev->dev.of_node;
 247
 248         register_pci_controller(&rt2880_pci_controller);
 249         return 0;
 250 }
 251
 252 int pcibios_plat_dev_init(struct pci_dev *dev)
 253 {
 254         return 0;
 255 }
 256
 257 static const struct of_device_id rt288x_pci_match[] = {
 258         { .compatible = "ralink,rt288x-pci" },
 259         {},
 260 };
 261
 262 static struct platform_driver rt288x_pci_driver = {
 263         .probe = rt288x_pci_probe,
 264         .driver = {
 265                 .name = "rt288x-pci",
 266                 .of_match_table = rt288x_pci_match,
 267         },
 268 };
 269
 270 int __init pcibios_init(void)
 271 {
 272         int ret = platform_driver_register(&rt288x_pci_driver);
 273
 274         if (ret)
 275                 pr_info("rt288x-pci: Error registering platform driver!");
 276
 277         return ret;
 278 }
 279
 280 arch_initcall(pcibios_init);