arch/mips/pci/pci-rt2880.c

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