arch/arm/common/it8152.c

   1 /*
   2  * linux/arch/arm/common/it8152.c
   3  *
   4  * Copyright Compulab Ltd, 2002-2007
   5  * Mike Rapoport <mike@compulab.co.il>
   6  *
   7  * The DMA bouncing part is taken from arch/arm/mach-ixp4xx/common-pci.c
   8  * (see this file for respective copyrights)
   9  *
  10  * Thanks to Guennadi Liakhovetski <gl@dsa-ac.de> for IRQ enumberation
  11  * and demux code.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17
  18 #include <linux/sched.h>
  19 #include <linux/kernel.h>
  20 #include <linux/pci.h>
  21 #include <linux/ptrace.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/mm.h>
  24 #include <linux/init.h>
  25 #include <linux/ioport.h>
  26 #include <linux/irq.h>
  27 #include <linux/io.h>
  28
  29 #include <asm/mach/pci.h>
  30 #include <asm/hardware/it8152.h>
  31
  32 #define MAX_SLOTS               21
  33
  34 static void it8152_mask_irq(struct irq_data *d)
  35 {
  36         unsigned int irq = d->irq;
  37
  38        if (irq >= IT8152_LD_IRQ(0)) {
  39                __raw_writel((__raw_readl(IT8152_INTC_LDCNIMR) |
  40                             (1 << (irq - IT8152_LD_IRQ(0)))),
  41                             IT8152_INTC_LDCNIMR);
  42        } else if (irq >= IT8152_LP_IRQ(0)) {
  43                __raw_writel((__raw_readl(IT8152_INTC_LPCNIMR) |
  44                             (1 << (irq - IT8152_LP_IRQ(0)))),
  45                             IT8152_INTC_LPCNIMR);
  46        } else if (irq >= IT8152_PD_IRQ(0)) {
  47                __raw_writel((__raw_readl(IT8152_INTC_PDCNIMR) |
  48                             (1 << (irq - IT8152_PD_IRQ(0)))),
  49                             IT8152_INTC_PDCNIMR);
  50        }
  51 }
  52
  53 static void it8152_unmask_irq(struct irq_data *d)
  54 {
  55         unsigned int irq = d->irq;
  56
  57        if (irq >= IT8152_LD_IRQ(0)) {
  58                __raw_writel((__raw_readl(IT8152_INTC_LDCNIMR) &
  59                              ~(1 << (irq - IT8152_LD_IRQ(0)))),
  60                             IT8152_INTC_LDCNIMR);
  61        } else if (irq >= IT8152_LP_IRQ(0)) {
  62                __raw_writel((__raw_readl(IT8152_INTC_LPCNIMR) &
  63                              ~(1 << (irq - IT8152_LP_IRQ(0)))),
  64                             IT8152_INTC_LPCNIMR);
  65        } else if (irq >= IT8152_PD_IRQ(0)) {
  66                __raw_writel((__raw_readl(IT8152_INTC_PDCNIMR) &
  67                              ~(1 << (irq - IT8152_PD_IRQ(0)))),
  68                             IT8152_INTC_PDCNIMR);
  69        }
  70 }
  71
  72 static struct irq_chip it8152_irq_chip = {
  73         .name           = "it8152",
  74         .irq_ack        = it8152_mask_irq,
  75         .irq_mask       = it8152_mask_irq,
  76         .irq_unmask     = it8152_unmask_irq,
  77 };
  78
  79 void it8152_init_irq(void)
  80 {
  81         int irq;
  82
  83         __raw_writel((0xffff), IT8152_INTC_PDCNIMR);
  84         __raw_writel((0), IT8152_INTC_PDCNIRR);
  85         __raw_writel((0xffff), IT8152_INTC_LPCNIMR);
  86         __raw_writel((0), IT8152_INTC_LPCNIRR);
  87         __raw_writel((0xffff), IT8152_INTC_LDCNIMR);
  88         __raw_writel((0), IT8152_INTC_LDCNIRR);
  89
  90         for (irq = IT8152_IRQ(0); irq <= IT8152_LAST_IRQ; irq++) {
  91                 irq_set_chip_and_handler(irq, &it8152_irq_chip,
  92                                          handle_level_irq);
  93                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
  94         }
  95 }
  96
  97 void it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
  98 {
  99        int bits_pd, bits_lp, bits_ld;
 100        int i;
 101
 102        while (1) {
 103                /* Read all */
 104                bits_pd = __raw_readl(IT8152_INTC_PDCNIRR);
 105                bits_lp = __raw_readl(IT8152_INTC_LPCNIRR);
 106                bits_ld = __raw_readl(IT8152_INTC_LDCNIRR);
 107
 108                /* Ack */
 109                __raw_writel((~bits_pd), IT8152_INTC_PDCNIRR);
 110                __raw_writel((~bits_lp), IT8152_INTC_LPCNIRR);
 111                __raw_writel((~bits_ld), IT8152_INTC_LDCNIRR);
 112
 113                if (!(bits_ld | bits_lp | bits_pd)) {
 114                        /* Re-read to guarantee, that there was a moment of
 115                           time, when they all three were 0. */
 116                        bits_pd = __raw_readl(IT8152_INTC_PDCNIRR);
 117                        bits_lp = __raw_readl(IT8152_INTC_LPCNIRR);
 118                        bits_ld = __raw_readl(IT8152_INTC_LDCNIRR);
 119                        if (!(bits_ld | bits_lp | bits_pd))
 120                                return;
 121                }
 122
 123                bits_pd &= ((1 << IT8152_PD_IRQ_COUNT) - 1);
 124                while (bits_pd) {
 125                        i = __ffs(bits_pd);
 126                        generic_handle_irq(IT8152_PD_IRQ(i));
 127                        bits_pd &= ~(1 << i);
 128                }
 129
 130                bits_lp &= ((1 << IT8152_LP_IRQ_COUNT) - 1);
 131                while (bits_lp) {
 132                        i = __ffs(bits_lp);
 133                        generic_handle_irq(IT8152_LP_IRQ(i));
 134                        bits_lp &= ~(1 << i);
 135                }
 136
 137                bits_ld &= ((1 << IT8152_LD_IRQ_COUNT) - 1);
 138                while (bits_ld) {
 139                        i = __ffs(bits_ld);
 140                        generic_handle_irq(IT8152_LD_IRQ(i));
 141                        bits_ld &= ~(1 << i);
 142                }
 143        }
 144 }
 145
 146 /* mapping for on-chip devices */
 147 int __init it8152_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 148 {
 149         if ((dev->vendor == PCI_VENDOR_ID_ITE) &&
 150             (dev->device == PCI_DEVICE_ID_ITE_8152)) {
 151                 if ((dev->class >> 8) == PCI_CLASS_MULTIMEDIA_AUDIO)
 152                         return IT8152_AUDIO_INT;
 153                 if ((dev->class >> 8) == PCI_CLASS_SERIAL_USB)
 154                         return IT8152_USB_INT;
 155                 if ((dev->class >> 8) == PCI_CLASS_SYSTEM_DMA)
 156                         return IT8152_CDMA_INT;
 157         }
 158
 159         return 0;
 160 }
 161
 162 static unsigned long it8152_pci_dev_base_address(struct pci_bus *bus,
 163                                                  unsigned int devfn)
 164 {
 165         unsigned long addr = 0;
 166
 167         if (bus->number == 0) {
 168                         if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
 169                                 addr = (devfn << 8);
 170         } else
 171                 addr = (bus->number << 16) | (devfn << 8);
 172
 173         return addr;
 174 }
 175
 176 static int it8152_pci_read_config(struct pci_bus *bus,
 177                                   unsigned int devfn, int where,
 178                                   int size, u32 *value)
 179 {
 180         unsigned long addr = it8152_pci_dev_base_address(bus, devfn);
 181         u32 v;
 182         int shift;
 183
 184         shift = (where & 3);
 185
 186         __raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
 187         v = (__raw_readl(IT8152_PCI_CFG_DATA)  >> (8 * (shift)));
 188
 189         *value = v;
 190
 191         return PCIBIOS_SUCCESSFUL;
 192 }
 193
 194 static int it8152_pci_write_config(struct pci_bus *bus,
 195                                    unsigned int devfn, int where,
 196                                    int size, u32 value)
 197 {
 198         unsigned long addr = it8152_pci_dev_base_address(bus, devfn);
 199         u32 v, vtemp, mask = 0;
 200         int shift;
 201
 202         if (size == 1)
 203                 mask = 0xff;
 204         if (size == 2)
 205                 mask = 0xffff;
 206
 207         shift = (where & 3);
 208
 209         __raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
 210         vtemp = __raw_readl(IT8152_PCI_CFG_DATA);
 211
 212         if (mask)
 213                 vtemp &= ~(mask << (8 * shift));
 214         else
 215                 vtemp = 0;
 216
 217         v = (value << (8 * shift));
 218         __raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
 219         __raw_writel((v | vtemp), IT8152_PCI_CFG_DATA);
 220
 221         return PCIBIOS_SUCCESSFUL;
 222 }
 223
 224 static struct pci_ops it8152_ops = {
 225         .read = it8152_pci_read_config,
 226         .write = it8152_pci_write_config,
 227 };
 228
 229 static struct resource it8152_io = {
 230         .name   = "IT8152 PCI I/O region",
 231         .flags  = IORESOURCE_IO,
 232 };
 233
 234 static struct resource it8152_mem = {
 235         .name   = "IT8152 PCI memory region",
 236         .start  = 0x10000000,
 237         .end    = 0x13e00000,
 238         .flags  = IORESOURCE_MEM,
 239 };
 240
 241 /*
 242  * The following functions are needed for DMA bouncing.
 243  * ITE8152 chip can address up to 64MByte, so all the devices
 244  * connected to ITE8152 (PCI and USB) should have limited DMA window
 245  */
 246
 247 /*
 248  * Setup DMA mask to 64MB on devices connected to ITE8152. Ignore all
 249  * other devices.
 250  */
 251 static int it8152_pci_platform_notify(struct device *dev)
 252 {
 253         if (dev->bus == &pci_bus_type) {
 254                 if (dev->dma_mask)
 255                         *dev->dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
 256                 dev->coherent_dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
 257                 dmabounce_register_dev(dev, 2048, 4096);
 258         }
 259         return 0;
 260 }
 261
 262 static int it8152_pci_platform_notify_remove(struct device *dev)
 263 {
 264         if (dev->bus == &pci_bus_type)
 265                 dmabounce_unregister_dev(dev);
 266
 267         return 0;
 268 }
 269
 270 int dma_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
 271 {
 272         dev_dbg(dev, "%s: dma_addr %08x, size %08x\n",
 273                 __func__, dma_addr, size);
 274         return (dev->bus == &pci_bus_type) &&
 275                 ((dma_addr + size - PHYS_OFFSET) >= SZ_64M);
 276 }
 277
 278 int dma_set_coherent_mask(struct device *dev, u64 mask)
 279 {
 280         if (mask >= PHYS_OFFSET + SZ_64M - 1)
 281                 return 0;
 282
 283         return -EIO;
 284 }
 285
 286 int __init it8152_pci_setup(int nr, struct pci_sys_data *sys)
 287 {
 288         it8152_io.start = IT8152_IO_BASE + 0x12000;
 289         it8152_io.end   = IT8152_IO_BASE + 0x12000 + 0x100000;
 290
 291         sys->mem_offset = 0x10000000;
 292         sys->io_offset  = IT8152_IO_BASE;
 293
 294         if (request_resource(&ioport_resource, &it8152_io)) {
 295                 printk(KERN_ERR "PCI: unable to allocate IO region\n");
 296                 goto err0;
 297         }
 298         if (request_resource(&iomem_resource, &it8152_mem)) {
 299                 printk(KERN_ERR "PCI: unable to allocate memory region\n");
 300                 goto err1;
 301         }
 302
 303         sys->resource[0] = &it8152_io;
 304         sys->resource[1] = &it8152_mem;
 305
 306         if (platform_notify || platform_notify_remove) {
 307                 printk(KERN_ERR "PCI: Can't use platform_notify\n");
 308                 goto err2;
 309         }
 310
 311         platform_notify = it8152_pci_platform_notify;
 312         platform_notify_remove = it8152_pci_platform_notify_remove;
 313
 314         return 1;
 315
 316 err2:
 317         release_resource(&it8152_io);
 318 err1:
 319         release_resource(&it8152_mem);
 320 err0:
 321         return -EBUSY;
 322 }
 323
 324 /*
 325  * If we set up a device for bus mastering, we need to check the latency
 326  * timer as we don't have even crappy BIOSes to set it properly.
 327  * The implementation is from arch/i386/pci/i386.c
 328  */
 329 unsigned int pcibios_max_latency = 255;
 330
 331 void pcibios_set_master(struct pci_dev *dev)
 332 {
 333         u8 lat;
 334
 335         /* no need to update on-chip OHCI controller */
 336         if ((dev->vendor == PCI_VENDOR_ID_ITE) &&
 337             (dev->device == PCI_DEVICE_ID_ITE_8152) &&
 338             ((dev->class >> 8) == PCI_CLASS_SERIAL_USB))
 339                 return;
 340
 341         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
 342         if (lat < 16)
 343                 lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
 344         else if (lat > pcibios_max_latency)
 345                 lat = pcibios_max_latency;
 346         else
 347                 return;
 348         printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n",
 349                pci_name(dev), lat);
 350         pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
 351 }
 352
 353
 354 struct pci_bus * __init it8152_pci_scan_bus(int nr, struct pci_sys_data *sys)
 355 {
 356         return pci_scan_bus(nr, &it8152_ops, sys);
 357 }
 358
 359 EXPORT_SYMBOL(dma_set_coherent_mask);