src/device/cardbus_device.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <device/device.h>
   5 #include <device/pci.h>
   6 #include <device/pci_ops.h>
   7 #include <device/cardbus.h>
   8 #include <types.h>
   9
  10 /*
  11  * I don't think this code is quite correct but it is close.
  12  * Anyone with a cardbus bridge and a little time should be able
  13  * to make it usable quickly. -- Eric Biederman 24 March 2005
  14  */
  15
  16 /*
  17  * IO should be max 256 bytes. However, since we may have a P2P bridge below
  18  * a cardbus bridge, we need 4K.
  19  */
  20 #define CARDBUS_IO_SIZE         4096
  21 #define CARDBUS_MEM_SIZE        (32 * 1024 * 1024)
  22
  23 static void cardbus_record_bridge_resource(struct device *dev, resource_t moving,
  24                 resource_t min_size, unsigned int index, unsigned long type)
  25 {
  26         struct resource *resource;
  27         unsigned long gran;
  28         resource_t step;
  29
  30         /* Initialize the constraints on the current bus. */
  31         resource = NULL;
  32         if (!moving)
  33                 return;
  34
  35         resource = new_resource(dev, index);
  36         resource->size = 0;
  37         gran = 0;
  38         step = 1;
  39         while ((moving & step) == 0) {
  40                 gran += 1;
  41                 step <<= 1;
  42         }
  43         resource->gran = gran;
  44         resource->align = gran;
  45         resource->limit = moving | (step - 1);
  46         resource->flags = type;
  47
  48         /* Don't let the minimum size exceed what we can put in the resource. */
  49         if ((min_size - 1) > resource->limit)
  50                 min_size = resource->limit + 1;
  51
  52         resource->size = min_size;
  53 }
  54
  55 void cardbus_read_resources(struct device *dev)
  56 {
  57         resource_t moving_base, moving_limit, moving;
  58         unsigned long type;
  59         u16 ctl;
  60
  61         /* See if needs a card control registers base address. */
  62
  63         pci_get_resource(dev, PCI_BASE_ADDRESS_0);
  64
  65         compact_resources(dev);
  66
  67         /* See which bridge I/O resources are implemented. */
  68         moving_base = pci_moving_config32(dev, PCI_CB_IO_BASE_0);
  69         moving_limit = pci_moving_config32(dev, PCI_CB_IO_LIMIT_0);
  70         moving = moving_base & moving_limit;
  71
  72         /* Initialize the I/O space constraints on the current bus. */
  73         cardbus_record_bridge_resource(dev, moving, CARDBUS_IO_SIZE,
  74                                        PCI_CB_IO_BASE_0, IORESOURCE_IO);
  75
  76         /* See which bridge I/O resources are implemented. */
  77         moving_base = pci_moving_config32(dev, PCI_CB_IO_BASE_1);
  78         moving_limit = pci_moving_config32(dev, PCI_CB_IO_LIMIT_1);
  79         moving = moving_base & moving_limit;
  80
  81         /* Initialize the I/O space constraints on the current bus. */
  82         cardbus_record_bridge_resource(dev, moving, CARDBUS_IO_SIZE,
  83                                        PCI_CB_IO_BASE_1, IORESOURCE_IO);
  84
  85         /* If I can, enable prefetch for mem0. */
  86         ctl = pci_read_config16(dev, PCI_CB_BRIDGE_CONTROL);
  87         ctl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
  88         ctl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
  89         ctl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
  90         pci_write_config16(dev, PCI_CB_BRIDGE_CONTROL, ctl);
  91         ctl = pci_read_config16(dev, PCI_CB_BRIDGE_CONTROL);
  92
  93         /* See which bridge memory resources are implemented. */
  94         moving_base = pci_moving_config32(dev, PCI_CB_MEMORY_BASE_0);
  95         moving_limit = pci_moving_config32(dev, PCI_CB_MEMORY_LIMIT_0);
  96         moving = moving_base & moving_limit;
  97
  98         /* Initialize the memory space constraints on the current bus. */
  99         type = IORESOURCE_MEM;
 100         if (ctl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)
 101                 type |= IORESOURCE_PREFETCH;
 102         cardbus_record_bridge_resource(dev, moving, CARDBUS_MEM_SIZE,
 103                                        PCI_CB_MEMORY_BASE_0, type);
 104
 105         /* See which bridge memory resources are implemented. */
 106         moving_base = pci_moving_config32(dev, PCI_CB_MEMORY_BASE_1);
 107         moving_limit = pci_moving_config32(dev, PCI_CB_MEMORY_LIMIT_1);
 108         moving = moving_base & moving_limit;
 109
 110         /* Initialize the memory space constraints on the current bus. */
 111         cardbus_record_bridge_resource(dev, moving, CARDBUS_MEM_SIZE,
 112                                        PCI_CB_MEMORY_BASE_1, IORESOURCE_MEM);
 113
 114         compact_resources(dev);
 115 }
 116
 117 void cardbus_enable_resources(struct device *dev)
 118 {
 119         u16 ctrl;
 120
 121         ctrl = pci_read_config16(dev, PCI_CB_BRIDGE_CONTROL);
 122         ctrl |= (dev->link_list->bridge_ctrl & (
 123                         PCI_BRIDGE_CTL_VGA |
 124                         PCI_BRIDGE_CTL_MASTER_ABORT |
 125                         PCI_BRIDGE_CTL_BUS_RESET));
 126         /* Error check */
 127         ctrl |= (PCI_CB_BRIDGE_CTL_PARITY | PCI_CB_BRIDGE_CTL_SERR);
 128         printk(BIOS_DEBUG, "%s bridge ctrl <- %04x\n", dev_path(dev), ctrl);
 129         pci_write_config16(dev, PCI_CB_BRIDGE_CONTROL, ctrl);
 130
 131         pci_dev_enable_resources(dev);
 132 }
 133
 134 struct device_operations default_cardbus_ops_bus = {
 135         .read_resources   = cardbus_read_resources,
 136         .set_resources    = pci_dev_set_resources,
 137         .enable_resources = cardbus_enable_resources,
 138         .scan_bus         = pci_scan_bridge,
 139         .reset_bus        = pci_bus_reset,
 140 };