1 /* Public domain. */
2
3 #include <linux/types.h>
4 #include <linux/ioport.h>
5 #include <linux/pci.h>
6 #include <drm/i915_drm.h>
7 #include "i915_drv.h"
8
9 struct resource intel_graphics_stolen_res = DEFINE_RES_MEM(0, 0);
10
11 bus_addr_t
gen3_stolen_base(struct inteldrm_softc * dev_priv)12 gen3_stolen_base(struct inteldrm_softc *dev_priv)
13 {
14 uint32_t bsm = pci_conf_read(dev_priv->pc, dev_priv->tag,
15 INTEL_BSM);
16 return bsm & INTEL_BSM_MASK;
17 }
18
19 bus_addr_t
gen11_stolen_base(struct inteldrm_softc * dev_priv)20 gen11_stolen_base(struct inteldrm_softc *dev_priv)
21 {
22 uint64_t bsm = pci_conf_read(dev_priv->pc, dev_priv->tag,
23 INTEL_GEN11_BSM_DW0);
24 bsm &= INTEL_BSM_MASK;
25 bsm |= (uint64_t)pci_conf_read(dev_priv->pc, dev_priv->tag,
26 INTEL_GEN11_BSM_DW1) << 32;
27 return bsm;
28 }
29
30 bus_size_t
i830_stolen_size(struct inteldrm_softc * dev_priv)31 i830_stolen_size(struct inteldrm_softc *dev_priv)
32 {
33 uint16_t gmch_ctl, gms;
34
35 pci_read_config_word(dev_priv->gmch.pdev, I830_GMCH_CTRL,
36 &gmch_ctl);
37 gms = gmch_ctl & I830_GMCH_GMS_MASK;
38
39 switch (gms) {
40 case I830_GMCH_GMS_STOLEN_512:
41 return 512 * 1024;
42 case I830_GMCH_GMS_STOLEN_1024:
43 return 1 * 1024 * 1024;
44 case I830_GMCH_GMS_STOLEN_8192:
45 return 8 * 1024 * 1024;
46 }
47
48 return 0;
49 }
50
51 bus_size_t
gen3_stolen_size(struct inteldrm_softc * dev_priv)52 gen3_stolen_size(struct inteldrm_softc *dev_priv)
53 {
54 uint16_t gmch_ctl, gms;
55
56 pci_read_config_word(dev_priv->gmch.pdev, I830_GMCH_CTRL,
57 &gmch_ctl);
58 gms = gmch_ctl & I855_GMCH_GMS_MASK;
59
60 switch (gms) {
61 case I855_GMCH_GMS_STOLEN_1M:
62 return 1 * 1024 * 1024;
63 case I855_GMCH_GMS_STOLEN_4M:
64 return 4 * 1024 * 1024;
65 case I855_GMCH_GMS_STOLEN_8M:
66 return 8 * 1024 * 1024;
67 case I855_GMCH_GMS_STOLEN_16M:
68 return 16 * 1024 * 1024;
69 case I855_GMCH_GMS_STOLEN_32M:
70 return 32 * 1024 * 1024;
71 case I915_GMCH_GMS_STOLEN_48M:
72 return 48 * 1024 * 1024;
73 case I915_GMCH_GMS_STOLEN_64M:
74 return 64 * 1024 * 1024;
75 case G33_GMCH_GMS_STOLEN_128M:
76 return 128 * 1024 * 1024;
77 case G33_GMCH_GMS_STOLEN_256M:
78 return 256 * 1024 * 1024;
79 case INTEL_GMCH_GMS_STOLEN_96M:
80 return 96 * 1024 * 1024;
81 case INTEL_GMCH_GMS_STOLEN_160M:
82 return 160 * 1024 * 1024;
83 case INTEL_GMCH_GMS_STOLEN_224M:
84 return 224 * 1024 * 1024;
85 case INTEL_GMCH_GMS_STOLEN_352M:
86 return 352 * 1024 * 1024;
87 }
88
89 return 0;
90 }
91
92 bus_size_t
gen6_stolen_size(struct inteldrm_softc * dev_priv)93 gen6_stolen_size(struct inteldrm_softc *dev_priv)
94 {
95 struct pci_dev *pdev = dev_priv->drm.pdev;
96 uint16_t gmch_ctl, gms;
97
98 pci_read_config_word(pdev, SNB_GMCH_CTRL, &gmch_ctl);
99 gms = (gmch_ctl >> SNB_GMCH_GMS_SHIFT) & SNB_GMCH_GMS_MASK;
100
101 return gms * (32 * 1024 * 1024);
102 }
103
104 bus_size_t
chv_stolen_size(struct inteldrm_softc * dev_priv)105 chv_stolen_size(struct inteldrm_softc *dev_priv)
106 {
107 struct pci_dev *pdev = dev_priv->drm.pdev;
108 uint16_t gmch_ctl, gms;
109
110 pci_read_config_word(pdev, SNB_GMCH_CTRL, &gmch_ctl);
111 gms = (gmch_ctl >> SNB_GMCH_GMS_SHIFT) & SNB_GMCH_GMS_MASK;
112
113 if (gms < 0x11)
114 return gms * (32 * 1024 * 1024);
115 else if (gms < 0x17)
116 return (gms - 0x11) * (4 * 1024 * 1024) + (8 * 1024 * 1024);
117 else
118 return (gms - 0x17) + (4 * 1024 * 1024) + (36 * 1024 * 1024);
119 }
120
121 bus_size_t
gen8_stolen_size(struct inteldrm_softc * dev_priv)122 gen8_stolen_size(struct inteldrm_softc *dev_priv)
123 {
124 struct pci_dev *pdev = dev_priv->drm.pdev;
125 uint16_t gmch_ctl, gms;
126
127 pci_read_config_word(pdev, SNB_GMCH_CTRL, &gmch_ctl);
128 gms = (gmch_ctl >> BDW_GMCH_GMS_SHIFT) & BDW_GMCH_GMS_MASK;
129
130 return gms * (32 * 1024 * 1024);
131 }
132
133 bus_size_t
gen9_stolen_size(struct inteldrm_softc * dev_priv)134 gen9_stolen_size(struct inteldrm_softc *dev_priv)
135 {
136 struct pci_dev *pdev = dev_priv->drm.pdev;
137 uint16_t gmch_ctl, gms;
138
139 pci_read_config_word(pdev, SNB_GMCH_CTRL, &gmch_ctl);
140 gms = (gmch_ctl >> BDW_GMCH_GMS_SHIFT) & BDW_GMCH_GMS_MASK;
141 if (gms < 0xf0)
142 return gms * (32 * 1024 * 1024);
143 else
144 return (gms - 0xf0) * (4 * 1024 * 1024) + (4 * 1024 * 1024);
145 }
146
147 void
intel_init_stolen_res(struct inteldrm_softc * dev_priv)148 intel_init_stolen_res(struct inteldrm_softc *dev_priv)
149 {
150 bus_addr_t stolen_base = 0;
151 bus_size_t stolen_size = 0;
152
153 #ifdef notyet
154 if (IS_I830(dev_priv))
155 stolen_base = i830_stolen_base(dev_priv);
156 else if (IS_I845G(dev_priv))
157 stolen_base = i845_stolen_base(dev_priv);
158 else if (IS_I85X(dev_priv))
159 stolen_base = i85x_stolen_base(dev_priv);
160 else if (IS_I865G(dev_priv))
161 stolen_base = i865_stolen_base(dev_priv);
162 #endif
163
164 if (GRAPHICS_VER(dev_priv) >= 3 && GRAPHICS_VER(dev_priv) < 11)
165 stolen_base = gen3_stolen_base(dev_priv);
166 else if (GRAPHICS_VER(dev_priv) == 11 || GRAPHICS_VER(dev_priv) == 12)
167 stolen_base = gen11_stolen_base(dev_priv);
168
169 if (IS_I830(dev_priv) || IS_I845G(dev_priv))
170 stolen_size = i830_stolen_size(dev_priv);
171 else if (IS_I85X(dev_priv) || IS_I865G(dev_priv) ||
172 (GRAPHICS_VER(dev_priv) >= 3 && GRAPHICS_VER(dev_priv) <= 5))
173 stolen_size = gen3_stolen_size(dev_priv);
174 else if (IS_CHERRYVIEW(dev_priv))
175 stolen_size = chv_stolen_size(dev_priv);
176 else if (GRAPHICS_VER(dev_priv) >= 6 && GRAPHICS_VER(dev_priv) < 8)
177 stolen_size = gen6_stolen_size(dev_priv);
178 else if (GRAPHICS_VER(dev_priv) == 8)
179 stolen_size = gen8_stolen_size(dev_priv);
180 else if (GRAPHICS_VER(dev_priv) >= 9 && GRAPHICS_VER(dev_priv) <= 12)
181 stolen_size = gen9_stolen_size(dev_priv);
182
183 if (stolen_base == 0 || stolen_size == 0)
184 return;
185
186 intel_graphics_stolen_res.start = stolen_base;
187 intel_graphics_stolen_res.end = stolen_base + stolen_size - 1;
188 }
189