Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 2 | /* |
| 3 | * Alchemy PCI host mode support. |
| 4 | * |
| 5 | * Copyright 2001-2003, 2007-2008 MontaVista Software Inc. |
| 6 | * Author: MontaVista Software, Inc. <source@mvista.com> |
| 7 | * |
| 8 | * Support for all devices (greater than 16) added by David Gathright. |
| 9 | */ |
| 10 | |
Manuel Lauss | 8e21170 | 2014-07-23 16:36:51 +0200 | [diff] [blame] | 11 | #include <linux/clk.h> |
Ralf Baechle | 71ca869 | 2011-11-10 14:15:57 +0000 | [diff] [blame] | 12 | #include <linux/export.h> |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 13 | #include <linux/types.h> |
| 14 | #include <linux/pci.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/init.h> |
Manuel Lauss | 864c6c22 | 2011-11-16 15:42:28 +0100 | [diff] [blame] | 18 | #include <linux/syscore_ops.h> |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 19 | #include <linux/vmalloc.h> |
Christoph Hellwig | 6d4e9a8 | 2021-02-10 10:56:39 +0100 | [diff] [blame] | 20 | #include <linux/dma-map-ops.h> /* for dma_default_coherent */ |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 21 | |
| 22 | #include <asm/mach-au1x00/au1000.h> |
Ralf Baechle | 3d18c98 | 2011-11-28 16:11:28 +0000 | [diff] [blame] | 23 | #include <asm/tlbmisc.h> |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 24 | |
Paul Bolle | 143f0f6 | 2013-04-04 12:47:01 +0000 | [diff] [blame] | 25 | #ifdef CONFIG_PCI_DEBUG |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 26 | #define DBG(x...) printk(KERN_DEBUG x) |
| 27 | #else |
| 28 | #define DBG(x...) do {} while (0) |
| 29 | #endif |
| 30 | |
| 31 | #define PCI_ACCESS_READ 0 |
| 32 | #define PCI_ACCESS_WRITE 1 |
| 33 | |
| 34 | struct alchemy_pci_context { |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 35 | struct pci_controller alchemy_pci_ctrl; /* leave as first member! */ |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 36 | void __iomem *regs; /* ctrl base */ |
| 37 | /* tools for wired entry for config space access */ |
| 38 | unsigned long last_elo0; |
| 39 | unsigned long last_elo1; |
| 40 | int wired_entry; |
| 41 | struct vm_struct *pci_cfg_vm; |
| 42 | |
| 43 | unsigned long pm[12]; |
| 44 | |
| 45 | int (*board_map_irq)(const struct pci_dev *d, u8 slot, u8 pin); |
| 46 | int (*board_pci_idsel)(unsigned int devsel, int assert); |
| 47 | }; |
| 48 | |
Manuel Lauss | 864c6c22 | 2011-11-16 15:42:28 +0100 | [diff] [blame] | 49 | /* for syscore_ops. There's only one PCI controller on Alchemy chips, so this |
| 50 | * should suffice for now. |
| 51 | */ |
| 52 | static struct alchemy_pci_context *__alchemy_pci_ctx; |
| 53 | |
| 54 | |
Christoph Hellwig | d399157 | 2020-04-16 17:00:07 +0200 | [diff] [blame] | 55 | /* IO/MEM resources for PCI. Keep the memres in sync with fixup_bigphys_addr |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 56 | * in arch/mips/alchemy/common/setup.c |
| 57 | */ |
| 58 | static struct resource alchemy_pci_def_memres = { |
| 59 | .start = ALCHEMY_PCI_MEMWIN_START, |
| 60 | .end = ALCHEMY_PCI_MEMWIN_END, |
| 61 | .name = "PCI memory space", |
| 62 | .flags = IORESOURCE_MEM |
| 63 | }; |
| 64 | |
| 65 | static struct resource alchemy_pci_def_iores = { |
| 66 | .start = ALCHEMY_PCI_IOWIN_START, |
| 67 | .end = ALCHEMY_PCI_IOWIN_END, |
| 68 | .name = "PCI IO space", |
| 69 | .flags = IORESOURCE_IO |
| 70 | }; |
| 71 | |
| 72 | static void mod_wired_entry(int entry, unsigned long entrylo0, |
| 73 | unsigned long entrylo1, unsigned long entryhi, |
| 74 | unsigned long pagemask) |
| 75 | { |
| 76 | unsigned long old_pagemask; |
| 77 | unsigned long old_ctx; |
| 78 | |
| 79 | /* Save old context and create impossible VPN2 value */ |
James Hogan | 9b5c339 | 2016-05-06 14:36:19 +0100 | [diff] [blame] | 80 | old_ctx = read_c0_entryhi() & MIPS_ENTRYHI_ASID; |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 81 | old_pagemask = read_c0_pagemask(); |
| 82 | write_c0_index(entry); |
| 83 | write_c0_pagemask(pagemask); |
| 84 | write_c0_entryhi(entryhi); |
| 85 | write_c0_entrylo0(entrylo0); |
| 86 | write_c0_entrylo1(entrylo1); |
| 87 | tlb_write_indexed(); |
| 88 | write_c0_entryhi(old_ctx); |
| 89 | write_c0_pagemask(old_pagemask); |
| 90 | } |
| 91 | |
| 92 | static void alchemy_pci_wired_entry(struct alchemy_pci_context *ctx) |
| 93 | { |
| 94 | ctx->wired_entry = read_c0_wired(); |
| 95 | add_wired_entry(0, 0, (unsigned long)ctx->pci_cfg_vm->addr, PM_4K); |
| 96 | ctx->last_elo0 = ctx->last_elo1 = ~0; |
| 97 | } |
| 98 | |
| 99 | static int config_access(unsigned char access_type, struct pci_bus *bus, |
| 100 | unsigned int dev_fn, unsigned char where, u32 *data) |
| 101 | { |
| 102 | struct alchemy_pci_context *ctx = bus->sysdata; |
| 103 | unsigned int device = PCI_SLOT(dev_fn); |
| 104 | unsigned int function = PCI_FUNC(dev_fn); |
| 105 | unsigned long offset, status, cfg_base, flags, entryLo0, entryLo1, r; |
| 106 | int error = PCIBIOS_SUCCESSFUL; |
| 107 | |
| 108 | if (device > 19) { |
| 109 | *data = 0xffffffff; |
| 110 | return -1; |
| 111 | } |
| 112 | |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 113 | local_irq_save(flags); |
| 114 | r = __raw_readl(ctx->regs + PCI_REG_STATCMD) & 0x0000ffff; |
| 115 | r |= PCI_STATCMD_STATUS(0x2000); |
| 116 | __raw_writel(r, ctx->regs + PCI_REG_STATCMD); |
| 117 | wmb(); |
| 118 | |
| 119 | /* Allow board vendors to implement their own off-chip IDSEL. |
| 120 | * If it doesn't succeed, may as well bail out at this point. |
| 121 | */ |
| 122 | if (ctx->board_pci_idsel(device, 1) == 0) { |
| 123 | *data = 0xffffffff; |
| 124 | local_irq_restore(flags); |
| 125 | return -1; |
| 126 | } |
| 127 | |
| 128 | /* Setup the config window */ |
| 129 | if (bus->number == 0) |
| 130 | cfg_base = (1 << device) << 11; |
| 131 | else |
| 132 | cfg_base = 0x80000000 | (bus->number << 16) | (device << 11); |
| 133 | |
| 134 | /* Setup the lower bits of the 36-bit address */ |
| 135 | offset = (function << 8) | (where & ~0x3); |
| 136 | /* Pick up any address that falls below the page mask */ |
| 137 | offset |= cfg_base & ~PAGE_MASK; |
| 138 | |
| 139 | /* Page boundary */ |
| 140 | cfg_base = cfg_base & PAGE_MASK; |
| 141 | |
| 142 | /* To improve performance, if the current device is the same as |
| 143 | * the last device accessed, we don't touch the TLB. |
| 144 | */ |
| 145 | entryLo0 = (6 << 26) | (cfg_base >> 6) | (2 << 3) | 7; |
| 146 | entryLo1 = (6 << 26) | (cfg_base >> 6) | (0x1000 >> 6) | (2 << 3) | 7; |
| 147 | if ((entryLo0 != ctx->last_elo0) || (entryLo1 != ctx->last_elo1)) { |
| 148 | mod_wired_entry(ctx->wired_entry, entryLo0, entryLo1, |
| 149 | (unsigned long)ctx->pci_cfg_vm->addr, PM_4K); |
| 150 | ctx->last_elo0 = entryLo0; |
| 151 | ctx->last_elo1 = entryLo1; |
| 152 | } |
| 153 | |
| 154 | if (access_type == PCI_ACCESS_WRITE) |
| 155 | __raw_writel(*data, ctx->pci_cfg_vm->addr + offset); |
| 156 | else |
| 157 | *data = __raw_readl(ctx->pci_cfg_vm->addr + offset); |
| 158 | wmb(); |
| 159 | |
| 160 | DBG("alchemy-pci: cfg access %d bus %u dev %u at %x dat %x conf %lx\n", |
| 161 | access_type, bus->number, device, where, *data, offset); |
| 162 | |
| 163 | /* check for errors, master abort */ |
| 164 | status = __raw_readl(ctx->regs + PCI_REG_STATCMD); |
| 165 | if (status & (1 << 29)) { |
| 166 | *data = 0xffffffff; |
| 167 | error = -1; |
Paul Bolle | 143f0f6 | 2013-04-04 12:47:01 +0000 | [diff] [blame] | 168 | DBG("alchemy-pci: master abort on cfg access %d bus %d dev %d\n", |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 169 | access_type, bus->number, device); |
| 170 | } else if ((status >> 28) & 0xf) { |
| 171 | DBG("alchemy-pci: PCI ERR detected: dev %d, status %lx\n", |
| 172 | device, (status >> 28) & 0xf); |
| 173 | |
| 174 | /* clear errors */ |
| 175 | __raw_writel(status & 0xf000ffff, ctx->regs + PCI_REG_STATCMD); |
| 176 | |
| 177 | *data = 0xffffffff; |
| 178 | error = -1; |
| 179 | } |
| 180 | |
| 181 | /* Take away the IDSEL. */ |
| 182 | (void)ctx->board_pci_idsel(device, 0); |
| 183 | |
| 184 | local_irq_restore(flags); |
| 185 | return error; |
| 186 | } |
| 187 | |
| 188 | static int read_config_byte(struct pci_bus *bus, unsigned int devfn, |
| 189 | int where, u8 *val) |
| 190 | { |
| 191 | u32 data; |
| 192 | int ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data); |
| 193 | |
| 194 | if (where & 1) |
| 195 | data >>= 8; |
| 196 | if (where & 2) |
| 197 | data >>= 16; |
| 198 | *val = data & 0xff; |
| 199 | return ret; |
| 200 | } |
| 201 | |
| 202 | static int read_config_word(struct pci_bus *bus, unsigned int devfn, |
| 203 | int where, u16 *val) |
| 204 | { |
| 205 | u32 data; |
| 206 | int ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data); |
| 207 | |
| 208 | if (where & 2) |
| 209 | data >>= 16; |
| 210 | *val = data & 0xffff; |
| 211 | return ret; |
| 212 | } |
| 213 | |
| 214 | static int read_config_dword(struct pci_bus *bus, unsigned int devfn, |
| 215 | int where, u32 *val) |
| 216 | { |
| 217 | return config_access(PCI_ACCESS_READ, bus, devfn, where, val); |
| 218 | } |
| 219 | |
| 220 | static int write_config_byte(struct pci_bus *bus, unsigned int devfn, |
| 221 | int where, u8 val) |
| 222 | { |
| 223 | u32 data = 0; |
| 224 | |
| 225 | if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) |
| 226 | return -1; |
| 227 | |
| 228 | data = (data & ~(0xff << ((where & 3) << 3))) | |
| 229 | (val << ((where & 3) << 3)); |
| 230 | |
| 231 | if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data)) |
| 232 | return -1; |
| 233 | |
| 234 | return PCIBIOS_SUCCESSFUL; |
| 235 | } |
| 236 | |
| 237 | static int write_config_word(struct pci_bus *bus, unsigned int devfn, |
| 238 | int where, u16 val) |
| 239 | { |
| 240 | u32 data = 0; |
| 241 | |
| 242 | if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) |
| 243 | return -1; |
| 244 | |
| 245 | data = (data & ~(0xffff << ((where & 3) << 3))) | |
| 246 | (val << ((where & 3) << 3)); |
| 247 | |
| 248 | if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data)) |
| 249 | return -1; |
| 250 | |
| 251 | return PCIBIOS_SUCCESSFUL; |
| 252 | } |
| 253 | |
| 254 | static int write_config_dword(struct pci_bus *bus, unsigned int devfn, |
| 255 | int where, u32 val) |
| 256 | { |
| 257 | return config_access(PCI_ACCESS_WRITE, bus, devfn, where, &val); |
| 258 | } |
| 259 | |
| 260 | static int alchemy_pci_read(struct pci_bus *bus, unsigned int devfn, |
| 261 | int where, int size, u32 *val) |
| 262 | { |
| 263 | switch (size) { |
| 264 | case 1: { |
| 265 | u8 _val; |
| 266 | int rc = read_config_byte(bus, devfn, where, &_val); |
| 267 | |
| 268 | *val = _val; |
| 269 | return rc; |
| 270 | } |
| 271 | case 2: { |
| 272 | u16 _val; |
| 273 | int rc = read_config_word(bus, devfn, where, &_val); |
| 274 | |
| 275 | *val = _val; |
| 276 | return rc; |
| 277 | } |
| 278 | default: |
| 279 | return read_config_dword(bus, devfn, where, val); |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | static int alchemy_pci_write(struct pci_bus *bus, unsigned int devfn, |
| 284 | int where, int size, u32 val) |
| 285 | { |
| 286 | switch (size) { |
| 287 | case 1: |
| 288 | return write_config_byte(bus, devfn, where, (u8) val); |
| 289 | case 2: |
| 290 | return write_config_word(bus, devfn, where, (u16) val); |
| 291 | default: |
| 292 | return write_config_dword(bus, devfn, where, val); |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | static struct pci_ops alchemy_pci_ops = { |
| 297 | .read = alchemy_pci_read, |
| 298 | .write = alchemy_pci_write, |
| 299 | }; |
| 300 | |
| 301 | static int alchemy_pci_def_idsel(unsigned int devsel, int assert) |
| 302 | { |
| 303 | return 1; /* success */ |
| 304 | } |
| 305 | |
Manuel Lauss | 864c6c22 | 2011-11-16 15:42:28 +0100 | [diff] [blame] | 306 | /* save PCI controller register contents. */ |
| 307 | static int alchemy_pci_suspend(void) |
| 308 | { |
| 309 | struct alchemy_pci_context *ctx = __alchemy_pci_ctx; |
| 310 | if (!ctx) |
| 311 | return 0; |
| 312 | |
| 313 | ctx->pm[0] = __raw_readl(ctx->regs + PCI_REG_CMEM); |
| 314 | ctx->pm[1] = __raw_readl(ctx->regs + PCI_REG_CONFIG) & 0x0009ffff; |
| 315 | ctx->pm[2] = __raw_readl(ctx->regs + PCI_REG_B2BMASK_CCH); |
| 316 | ctx->pm[3] = __raw_readl(ctx->regs + PCI_REG_B2BBASE0_VID); |
| 317 | ctx->pm[4] = __raw_readl(ctx->regs + PCI_REG_B2BBASE1_SID); |
| 318 | ctx->pm[5] = __raw_readl(ctx->regs + PCI_REG_MWMASK_DEV); |
| 319 | ctx->pm[6] = __raw_readl(ctx->regs + PCI_REG_MWBASE_REV_CCL); |
| 320 | ctx->pm[7] = __raw_readl(ctx->regs + PCI_REG_ID); |
| 321 | ctx->pm[8] = __raw_readl(ctx->regs + PCI_REG_CLASSREV); |
| 322 | ctx->pm[9] = __raw_readl(ctx->regs + PCI_REG_PARAM); |
| 323 | ctx->pm[10] = __raw_readl(ctx->regs + PCI_REG_MBAR); |
| 324 | ctx->pm[11] = __raw_readl(ctx->regs + PCI_REG_TIMEOUT); |
| 325 | |
| 326 | return 0; |
| 327 | } |
| 328 | |
| 329 | static void alchemy_pci_resume(void) |
| 330 | { |
| 331 | struct alchemy_pci_context *ctx = __alchemy_pci_ctx; |
| 332 | if (!ctx) |
| 333 | return; |
| 334 | |
| 335 | __raw_writel(ctx->pm[0], ctx->regs + PCI_REG_CMEM); |
| 336 | __raw_writel(ctx->pm[2], ctx->regs + PCI_REG_B2BMASK_CCH); |
| 337 | __raw_writel(ctx->pm[3], ctx->regs + PCI_REG_B2BBASE0_VID); |
| 338 | __raw_writel(ctx->pm[4], ctx->regs + PCI_REG_B2BBASE1_SID); |
| 339 | __raw_writel(ctx->pm[5], ctx->regs + PCI_REG_MWMASK_DEV); |
| 340 | __raw_writel(ctx->pm[6], ctx->regs + PCI_REG_MWBASE_REV_CCL); |
| 341 | __raw_writel(ctx->pm[7], ctx->regs + PCI_REG_ID); |
| 342 | __raw_writel(ctx->pm[8], ctx->regs + PCI_REG_CLASSREV); |
| 343 | __raw_writel(ctx->pm[9], ctx->regs + PCI_REG_PARAM); |
| 344 | __raw_writel(ctx->pm[10], ctx->regs + PCI_REG_MBAR); |
| 345 | __raw_writel(ctx->pm[11], ctx->regs + PCI_REG_TIMEOUT); |
| 346 | wmb(); |
| 347 | __raw_writel(ctx->pm[1], ctx->regs + PCI_REG_CONFIG); |
| 348 | wmb(); |
| 349 | |
| 350 | /* YAMON on all db1xxx boards wipes the TLB and writes zero to C0_wired |
| 351 | * on resume, making it necessary to recreate it as soon as possible. |
| 352 | */ |
| 353 | ctx->wired_entry = 8191; /* impossibly high value */ |
| 354 | alchemy_pci_wired_entry(ctx); /* install it */ |
| 355 | } |
| 356 | |
| 357 | static struct syscore_ops alchemy_pci_pmops = { |
| 358 | .suspend = alchemy_pci_suspend, |
| 359 | .resume = alchemy_pci_resume, |
| 360 | }; |
| 361 | |
Greg Kroah-Hartman | 28eb0e4 | 2012-12-21 14:04:39 -0800 | [diff] [blame] | 362 | static int alchemy_pci_probe(struct platform_device *pdev) |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 363 | { |
| 364 | struct alchemy_pci_platdata *pd = pdev->dev.platform_data; |
| 365 | struct alchemy_pci_context *ctx; |
| 366 | void __iomem *virt_io; |
| 367 | unsigned long val; |
| 368 | struct resource *r; |
Manuel Lauss | 8e21170 | 2014-07-23 16:36:51 +0200 | [diff] [blame] | 369 | struct clk *c; |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 370 | int ret; |
| 371 | |
| 372 | /* need at least PCI IRQ mapping table */ |
| 373 | if (!pd) { |
| 374 | dev_err(&pdev->dev, "need platform data for PCI setup\n"); |
| 375 | ret = -ENODEV; |
| 376 | goto out; |
| 377 | } |
| 378 | |
| 379 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
| 380 | if (!ctx) { |
| 381 | dev_err(&pdev->dev, "no memory for pcictl context\n"); |
| 382 | ret = -ENOMEM; |
| 383 | goto out; |
| 384 | } |
| 385 | |
| 386 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 387 | if (!r) { |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 388 | dev_err(&pdev->dev, "no pcictl ctrl regs resource\n"); |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 389 | ret = -ENODEV; |
| 390 | goto out1; |
| 391 | } |
| 392 | |
| 393 | if (!request_mem_region(r->start, resource_size(r), pdev->name)) { |
| 394 | dev_err(&pdev->dev, "cannot claim pci regs\n"); |
| 395 | ret = -ENODEV; |
| 396 | goto out1; |
| 397 | } |
| 398 | |
Manuel Lauss | 8e21170 | 2014-07-23 16:36:51 +0200 | [diff] [blame] | 399 | c = clk_get(&pdev->dev, "pci_clko"); |
| 400 | if (IS_ERR(c)) { |
| 401 | dev_err(&pdev->dev, "unable to find PCI clock\n"); |
| 402 | ret = PTR_ERR(c); |
| 403 | goto out2; |
| 404 | } |
| 405 | |
| 406 | ret = clk_prepare_enable(c); |
| 407 | if (ret) { |
| 408 | dev_err(&pdev->dev, "cannot enable PCI clock\n"); |
| 409 | goto out6; |
| 410 | } |
| 411 | |
Christoph Hellwig | 4bdc0d6 | 2020-01-06 09:43:50 +0100 | [diff] [blame] | 412 | ctx->regs = ioremap(r->start, resource_size(r)); |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 413 | if (!ctx->regs) { |
| 414 | dev_err(&pdev->dev, "cannot map pci regs\n"); |
| 415 | ret = -ENODEV; |
Manuel Lauss | 8e21170 | 2014-07-23 16:36:51 +0200 | [diff] [blame] | 416 | goto out5; |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | /* map parts of the PCI IO area */ |
| 420 | /* REVISIT: if this changes with a newer variant (doubt it) make this |
| 421 | * a platform resource. |
| 422 | */ |
| 423 | virt_io = ioremap(AU1500_PCI_IO_PHYS_ADDR, 0x00100000); |
| 424 | if (!virt_io) { |
| 425 | dev_err(&pdev->dev, "cannot remap pci io space\n"); |
| 426 | ret = -ENODEV; |
| 427 | goto out3; |
| 428 | } |
| 429 | ctx->alchemy_pci_ctrl.io_map_base = (unsigned long)virt_io; |
| 430 | |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 431 | /* Au1500 revisions older than AD have borked coherent PCI */ |
Christoph Hellwig | 14ac09a | 2021-02-10 10:56:38 +0100 | [diff] [blame] | 432 | if (alchemy_get_cputype() == ALCHEMY_CPU_AU1500 && |
| 433 | read_c0_prid() < 0x01030202 && !dma_default_coherent) { |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 434 | val = __raw_readl(ctx->regs + PCI_REG_CONFIG); |
| 435 | val |= PCI_CONFIG_NC; |
| 436 | __raw_writel(val, ctx->regs + PCI_REG_CONFIG); |
| 437 | wmb(); |
| 438 | dev_info(&pdev->dev, "non-coherent PCI on Au1500 AA/AB/AC\n"); |
| 439 | } |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 440 | |
| 441 | if (pd->board_map_irq) |
| 442 | ctx->board_map_irq = pd->board_map_irq; |
| 443 | |
| 444 | if (pd->board_pci_idsel) |
| 445 | ctx->board_pci_idsel = pd->board_pci_idsel; |
| 446 | else |
| 447 | ctx->board_pci_idsel = alchemy_pci_def_idsel; |
| 448 | |
| 449 | /* fill in relevant pci_controller members */ |
| 450 | ctx->alchemy_pci_ctrl.pci_ops = &alchemy_pci_ops; |
| 451 | ctx->alchemy_pci_ctrl.mem_resource = &alchemy_pci_def_memres; |
| 452 | ctx->alchemy_pci_ctrl.io_resource = &alchemy_pci_def_iores; |
| 453 | |
| 454 | /* we can't ioremap the entire pci config space because it's too large, |
| 455 | * nor can we dynamically ioremap it because some drivers use the |
| 456 | * PCI config routines from within atomic contex and that becomes a |
| 457 | * problem in get_vm_area(). Instead we use one wired TLB entry to |
| 458 | * handle all config accesses for all busses. |
| 459 | */ |
| 460 | ctx->pci_cfg_vm = get_vm_area(0x2000, VM_IOREMAP); |
| 461 | if (!ctx->pci_cfg_vm) { |
| 462 | dev_err(&pdev->dev, "unable to get vm area\n"); |
| 463 | ret = -ENOMEM; |
| 464 | goto out4; |
| 465 | } |
Manuel Lauss | 864c6c22 | 2011-11-16 15:42:28 +0100 | [diff] [blame] | 466 | ctx->wired_entry = 8191; /* impossibly high value */ |
| 467 | alchemy_pci_wired_entry(ctx); /* install it */ |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 468 | |
| 469 | set_io_port_base((unsigned long)ctx->alchemy_pci_ctrl.io_map_base); |
| 470 | |
| 471 | /* board may want to modify bits in the config register, do it now */ |
| 472 | val = __raw_readl(ctx->regs + PCI_REG_CONFIG); |
| 473 | val &= ~pd->pci_cfg_clr; |
| 474 | val |= pd->pci_cfg_set; |
| 475 | val &= ~PCI_CONFIG_PD; /* clear disable bit */ |
| 476 | __raw_writel(val, ctx->regs + PCI_REG_CONFIG); |
| 477 | wmb(); |
| 478 | |
Manuel Lauss | 864c6c22 | 2011-11-16 15:42:28 +0100 | [diff] [blame] | 479 | __alchemy_pci_ctx = ctx; |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 480 | platform_set_drvdata(pdev, ctx); |
Manuel Lauss | 864c6c22 | 2011-11-16 15:42:28 +0100 | [diff] [blame] | 481 | register_syscore_ops(&alchemy_pci_pmops); |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 482 | register_pci_controller(&ctx->alchemy_pci_ctrl); |
| 483 | |
Manuel Lauss | 8e21170 | 2014-07-23 16:36:51 +0200 | [diff] [blame] | 484 | dev_info(&pdev->dev, "PCI controller at %ld MHz\n", |
| 485 | clk_get_rate(c) / 1000000); |
| 486 | |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 487 | return 0; |
| 488 | |
| 489 | out4: |
| 490 | iounmap(virt_io); |
| 491 | out3: |
| 492 | iounmap(ctx->regs); |
Manuel Lauss | 8e21170 | 2014-07-23 16:36:51 +0200 | [diff] [blame] | 493 | out5: |
| 494 | clk_disable_unprepare(c); |
| 495 | out6: |
| 496 | clk_put(c); |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 497 | out2: |
| 498 | release_mem_region(r->start, resource_size(r)); |
| 499 | out1: |
| 500 | kfree(ctx); |
| 501 | out: |
| 502 | return ret; |
| 503 | } |
| 504 | |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 505 | static struct platform_driver alchemy_pcictl_driver = { |
| 506 | .probe = alchemy_pci_probe, |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 507 | .driver = { |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 508 | .name = "alchemy-pci", |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 509 | }, |
| 510 | }; |
| 511 | |
| 512 | static int __init alchemy_pci_init(void) |
| 513 | { |
| 514 | /* Au1500/Au1550 have PCI */ |
| 515 | switch (alchemy_get_cputype()) { |
| 516 | case ALCHEMY_CPU_AU1500: |
| 517 | case ALCHEMY_CPU_AU1550: |
| 518 | return platform_driver_register(&alchemy_pcictl_driver); |
| 519 | } |
| 520 | return 0; |
| 521 | } |
| 522 | arch_initcall(alchemy_pci_init); |
| 523 | |
| 524 | |
Manuel Lauss | 8eba365 | 2017-09-12 20:36:28 +0200 | [diff] [blame] | 525 | int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
Manuel Lauss | 7517de3 | 2011-08-12 11:39:44 +0200 | [diff] [blame] | 526 | { |
| 527 | struct alchemy_pci_context *ctx = dev->sysdata; |
| 528 | if (ctx && ctx->board_map_irq) |
| 529 | return ctx->board_map_irq(dev, slot, pin); |
| 530 | return -1; |
| 531 | } |
| 532 | |
| 533 | int pcibios_plat_dev_init(struct pci_dev *dev) |
| 534 | { |
| 535 | return 0; |
| 536 | } |