1 /* Turn off machine check triggers when reading
2 * pci space where there are no devices.
3 * This is necessary when scaning the bus for
4 * devices which is done by the kernel
6 * written in 2003 by Eric Biederman
8 * - Athlon64 workarounds by Stefan Reinauer
9 * - "reset once" logic by Yinghai Lu
12 #include <console/console.h>
13 #include <device/device.h>
14 #include <device/pci.h>
15 #include <device/pci_ids.h>
16 #include <device/pci_ops.h>
17 #include <part/hard_reset.h>
18 #include <pc80/mc146818rtc.h>
20 #include <cpu/amd/model_fxx_rev.h>
25 * @brief Read resources for AGP aperture
29 * There is only one AGP aperture resource needed. The resoruce is added to
30 * the northbridge of BSP.
32 * The same trick can be used to augment legacy VGA resources which can
33 * be detect by generic pci reousrce allocator for VGA devices.
34 * BAD: it is more tricky than I think, the resource allocation code is
35 * implemented in a way to NOT DOING legacy VGA resource allcation on
38 static void mcf3_read_resources(device_t dev)
40 struct resource *resource;
42 /* Read the generic PCI resources */
43 pci_dev_read_resources(dev);
45 /* If we are not the first processor don't allocate the gart apeture */
46 if (dev->path.u.pci.devfn != PCI_DEVFN(0x18, 3)) {
51 get_option(&iommu, "iommu");
54 /* Add a Gart apeture resource */
55 resource = new_resource(dev, 0x94);
56 resource->size = iommu?AGP_APERTURE_SIZE:1;
57 resource->align = log2(resource->size);
58 resource->gran = log2(resource->size);
59 resource->limit = 0xffffffff; /* 4G */
60 resource->flags = IORESOURCE_MEM;
64 static void set_agp_aperture(device_t dev)
66 struct resource *resource;
68 resource = probe_resource(dev, 0x94);
71 uint32_t gart_base, gart_acr;
73 /* Remember this resource has been stored */
74 resource->flags |= IORESOURCE_STORED;
76 /* Find the size of the GART aperture */
77 gart_acr = (0<<6)|(0<<5)|(0<<4)|((resource->gran - 25) << 1)|(0<<0);
79 /* Get the base address */
80 gart_base = ((resource->base) >> 25) & 0x00007fff;
82 /* Update the other northbriges */
84 while((pdev = dev_find_device(PCI_VENDOR_ID_AMD, 0x1103, pdev))) {
85 /* Store the GART size but don't enable it */
86 pci_write_config32(pdev, 0x90, gart_acr);
88 /* Store the GART base address */
89 pci_write_config32(pdev, 0x94, gart_base);
91 /* Don't set the GART Table base address */
92 pci_write_config32(pdev, 0x98, 0);
94 /* Report the resource has been stored... */
95 report_resource_stored(pdev, resource, " <gart>");
100 static void mcf3_set_resources(device_t dev)
102 /* Set the gart apeture */
103 set_agp_aperture(dev);
105 /* Set the generic PCI resources */
106 pci_dev_set_resources(dev);
109 static void misc_control_init(struct device *dev)
111 uint32_t cmd, cmd_ref;
113 struct device *f0_dev, *f2_dev;
115 printk_debug("NB: Function 3 Misc Control.. ");
118 /* Disable Machine checks from Invalid Locations.
119 * This is needed for PC backwards compatibility.
121 cmd = pci_read_config32(dev, 0x44);
122 cmd |= (1<<6) | (1<<25);
123 pci_write_config32(dev, 0x44, cmd );
124 if (is_cpu_pre_c0()) {
127 * Disable CPU low power states C2, C1 and throttling
129 cmd = pci_read_config32(dev, 0x80);
131 pci_write_config32(dev, 0x80, cmd );
132 cmd = pci_read_config32(dev, 0x84);
135 pci_write_config32(dev, 0x84, cmd );
138 * Limit the number of downstream posted requests to 1
140 cmd = pci_read_config32(dev, 0x70);
141 if ((cmd & (3 << 0)) != 2) {
144 pci_write_config32(dev, 0x70, cmd );
147 cmd = pci_read_config32(dev, 0x7c);
148 if ((cmd & (3 << 4)) != 0) {
151 pci_write_config32(dev, 0x7c, cmd );
154 /* Clock Power/Timing Low */
155 cmd = pci_read_config32(dev, 0xd4);
156 if (cmd != 0x000D0001) {
158 pci_write_config32(dev, 0xd4, cmd);
159 needs_reset = 1; /* Needed? */
162 else if(is_cpu_pre_d0()) {
164 f2_dev = dev_find_slot(0, dev->path.u.pci.devfn - 3 + 2);
166 * Set Clk Ramp Hystersis to 7
167 * Clock Power/Timing Low
169 cmd_ref = 0x04e20707; /* Registered */
170 dcl = pci_read_config32(f2_dev, DRAM_CONFIG_LOW);
171 if (dcl & DCL_UnBufDimm) {
172 cmd_ref = 0x000D0701; /* Unbuffered */
174 cmd = pci_read_config32(dev, 0xd4);
176 pci_write_config32(dev, 0xd4, cmd_ref );
177 needs_reset = 1; /* Needed? */
180 /* Optimize the Link read pointers */
181 f0_dev = dev_find_slot(0, dev->path.u.pci.devfn - 3);
184 cmd_ref = cmd = pci_read_config32(dev, 0xdc);
185 for(link = 0; link < 3; link++) {
188 /* This works on an Athlon64 because unimplemented links return 0 */
189 reg = 0x98 + (link * 0x20);
190 link_type = pci_read_config32(f0_dev, reg);
191 /* Only handle coherent link here please */
192 if ((link_type & (LinkConnected|InitComplete|NonCoherent))
193 == (LinkConnected|InitComplete))
195 cmd &= ~(0xff << (link *8));
196 /* FIXME this assumes the device on the other side is an AMD device */
197 cmd |= 0x25 << (link *8);
200 if (cmd != cmd_ref) {
201 pci_write_config32(dev, 0xdc, cmd);
206 printk_err("Missing f0 device!\n");
209 printk_debug("resetting cpu\n");
212 printk_debug("done.\n");
216 static struct device_operations mcf3_ops = {
217 .read_resources = mcf3_read_resources,
218 .set_resources = mcf3_set_resources,
219 .enable_resources = pci_dev_enable_resources,
220 .init = misc_control_init,
225 static struct pci_driver mcf3_driver __pci_driver = {
227 .vendor = PCI_VENDOR_ID_AMD,