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3696a8a4 MR |
1 | /* |
2 | * linux/arch/arm/mach-pxa/cm-x270-pci.c | |
3 | * | |
4 | * PCI bios-type initialisation for PCI machines | |
5 | * | |
6 | * Bits taken from various places. | |
7 | * | |
8 | * Copyright (C) 2007 Compulab, Ltd. | |
9 | * Mike Rapoport <mike@compulab.co.il> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/pci.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/irq.h> | |
22 | ||
23 | #include <asm/mach/pci.h> | |
24 | #include <asm/arch/cm-x270.h> | |
25 | #include <asm/arch/pxa-regs.h> | |
26 | #include <asm/mach-types.h> | |
27 | ||
28 | #include <asm/hardware/it8152.h> | |
29 | ||
30 | unsigned long it8152_base_address = CMX270_IT8152_VIRT; | |
31 | ||
32 | /* | |
33 | * Only first 64MB of memory can be accessed via PCI. | |
34 | * We use GFP_DMA to allocate safe buffers to do map/unmap. | |
35 | * This is really ugly and we need a better way of specifying | |
36 | * DMA-capable regions of memory. | |
37 | */ | |
38 | void __init cmx270_pci_adjust_zones(int node, unsigned long *zone_size, | |
39 | unsigned long *zhole_size) | |
40 | { | |
41 | unsigned int sz = SZ_64M >> PAGE_SHIFT; | |
42 | ||
a0113a99 | 43 | pr_info("Adjusting zones for CM-x270\n"); |
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44 | |
45 | /* | |
46 | * Only adjust if > 64M on current system | |
47 | */ | |
48 | if (node || (zone_size[0] <= sz)) | |
49 | return; | |
50 | ||
51 | zone_size[1] = zone_size[0] - sz; | |
52 | zone_size[0] = sz; | |
53 | zhole_size[1] = zhole_size[0]; | |
54 | zhole_size[0] = 0; | |
55 | } | |
56 | ||
57 | static void cmx270_it8152_irq_demux(unsigned int irq, struct irq_desc *desc) | |
58 | { | |
59 | /* clear our parent irq */ | |
60 | GEDR(GPIO_IT8152_IRQ) = GPIO_bit(GPIO_IT8152_IRQ); | |
61 | ||
62 | it8152_irq_demux(irq, desc); | |
63 | } | |
64 | ||
65 | void __cmx270_pci_init_irq(void) | |
66 | { | |
67 | it8152_init_irq(); | |
68 | pxa_gpio_mode(IRQ_TO_GPIO(GPIO_IT8152_IRQ)); | |
69 | set_irq_type(IRQ_GPIO(GPIO_IT8152_IRQ), IRQT_RISING); | |
70 | ||
71 | set_irq_chained_handler(IRQ_GPIO(GPIO_IT8152_IRQ), | |
72 | cmx270_it8152_irq_demux); | |
73 | } | |
74 | ||
75 | #ifdef CONFIG_PM | |
76 | static unsigned long sleep_save_ite[10]; | |
77 | ||
78 | void __cmx270_pci_suspend(void) | |
79 | { | |
80 | /* save ITE state */ | |
81 | sleep_save_ite[0] = __raw_readl(IT8152_INTC_PDCNIMR); | |
82 | sleep_save_ite[1] = __raw_readl(IT8152_INTC_LPCNIMR); | |
83 | sleep_save_ite[2] = __raw_readl(IT8152_INTC_LPNIAR); | |
84 | ||
85 | /* Clear ITE IRQ's */ | |
86 | __raw_writel((0), IT8152_INTC_PDCNIRR); | |
87 | __raw_writel((0), IT8152_INTC_LPCNIRR); | |
88 | } | |
89 | ||
90 | void __cmx270_pci_resume(void) | |
91 | { | |
92 | /* restore IT8152 state */ | |
93 | __raw_writel((sleep_save_ite[0]), IT8152_INTC_PDCNIMR); | |
94 | __raw_writel((sleep_save_ite[1]), IT8152_INTC_LPCNIMR); | |
95 | __raw_writel((sleep_save_ite[2]), IT8152_INTC_LPNIAR); | |
96 | } | |
97 | #else | |
98 | void cmx270_pci_suspend(void) {} | |
99 | void cmx270_pci_resume(void) {} | |
100 | #endif | |
101 | ||
102 | /* PCI IRQ mapping*/ | |
103 | static int __init cmx270_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin) | |
104 | { | |
105 | int irq; | |
106 | ||
a0113a99 | 107 | dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __FUNCTION__, slot, pin); |
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108 | |
109 | irq = it8152_pci_map_irq(dev, slot, pin); | |
110 | if (irq) | |
111 | return irq; | |
112 | ||
113 | /* | |
114 | Here comes the ugly part. The routing is baseboard specific, | |
115 | but defining a platform for each possible base of CM-x270 is | |
116 | unrealistic. Here we keep mapping for ATXBase and SB-x270. | |
117 | */ | |
118 | /* ATXBASE PCI slot */ | |
119 | if (slot == 7) | |
120 | return IT8152_PCI_INTA; | |
121 | ||
122 | /* ATXBase/SB-x270 CardBus */ | |
123 | if (slot == 8 || slot == 0) | |
124 | return IT8152_PCI_INTB; | |
125 | ||
126 | /* ATXBase Ethernet */ | |
127 | if (slot == 9) | |
128 | return IT8152_PCI_INTA; | |
129 | ||
130 | /* SB-x270 Ethernet */ | |
131 | if (slot == 16) | |
132 | return IT8152_PCI_INTA; | |
133 | ||
134 | /* PC104+ interrupt routing */ | |
135 | if ((slot == 17) || (slot == 19)) | |
136 | return IT8152_PCI_INTA; | |
137 | if ((slot == 18) || (slot == 20)) | |
138 | return IT8152_PCI_INTB; | |
139 | ||
140 | return(0); | |
141 | } | |
142 | ||
a0113a99 | 143 | static void cmx270_pci_preinit(void) |
3696a8a4 | 144 | { |
a0113a99 | 145 | pr_info("Initializing CM-X270 PCI subsystem\n"); |
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146 | |
147 | __raw_writel(0x800, IT8152_PCI_CFG_ADDR); | |
148 | if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) { | |
a0113a99 | 149 | pr_info("PCI Bridge found.\n"); |
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150 | |
151 | /* set PCI I/O base at 0 */ | |
152 | writel(0x848, IT8152_PCI_CFG_ADDR); | |
153 | writel(0, IT8152_PCI_CFG_DATA); | |
154 | ||
155 | /* set PCI memory base at 0 */ | |
156 | writel(0x840, IT8152_PCI_CFG_ADDR); | |
157 | writel(0, IT8152_PCI_CFG_DATA); | |
158 | ||
159 | writel(0x20, IT8152_GPIO_GPDR); | |
160 | ||
161 | /* CardBus Controller on ATXbase baseboard */ | |
162 | writel(0x4000, IT8152_PCI_CFG_ADDR); | |
163 | if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) { | |
a0113a99 | 164 | pr_info("CardBus Bridge found.\n"); |
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165 | |
166 | /* Configure socket 0 */ | |
167 | writel(0x408C, IT8152_PCI_CFG_ADDR); | |
168 | writel(0x1022, IT8152_PCI_CFG_DATA); | |
169 | ||
170 | writel(0x4080, IT8152_PCI_CFG_ADDR); | |
171 | writel(0x3844d060, IT8152_PCI_CFG_DATA); | |
172 | ||
173 | writel(0x4090, IT8152_PCI_CFG_ADDR); | |
174 | writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) | | |
175 | 0x60440000), | |
176 | IT8152_PCI_CFG_DATA); | |
177 | ||
178 | writel(0x4018, IT8152_PCI_CFG_ADDR); | |
179 | writel(0xb0000000, IT8152_PCI_CFG_DATA); | |
180 | ||
181 | /* Configure socket 1 */ | |
182 | writel(0x418C, IT8152_PCI_CFG_ADDR); | |
183 | writel(0x1022, IT8152_PCI_CFG_DATA); | |
184 | ||
185 | writel(0x4180, IT8152_PCI_CFG_ADDR); | |
186 | writel(0x3844d060, IT8152_PCI_CFG_DATA); | |
187 | ||
188 | writel(0x4190, IT8152_PCI_CFG_ADDR); | |
189 | writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) | | |
190 | 0x60440000), | |
191 | IT8152_PCI_CFG_DATA); | |
192 | ||
193 | writel(0x4118, IT8152_PCI_CFG_ADDR); | |
194 | writel(0xb0000000, IT8152_PCI_CFG_DATA); | |
195 | } | |
196 | } | |
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197 | } |
198 | ||
199 | static struct hw_pci cmx270_pci __initdata = { | |
200 | .swizzle = pci_std_swizzle, | |
201 | .map_irq = cmx270_pci_map_irq, | |
202 | .nr_controllers = 1, | |
203 | .setup = it8152_pci_setup, | |
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204 | .scan = it8152_pci_scan_bus, |
205 | .preinit = cmx270_pci_preinit, | |
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206 | }; |
207 | ||
208 | static int __init cmx270_init_pci(void) | |
209 | { | |
210 | if (machine_is_armcore()) | |
211 | pci_common_init(&cmx270_pci); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | subsys_initcall(cmx270_init_pci); |