Merge branch 'for-2.6.39' of git://linux-nfs.org/~bfields/linux
[pandora-kernel.git] / arch / arm / mach-pxa / cm-x2xx-pci.c
1 /*
2  * linux/arch/arm/mach-pxa/cm-x2xx-pci.c
3  *
4  * PCI bios-type initialisation for PCI machines
5  *
6  * Bits taken from various places.
7  *
8  * Copyright (C) 2007, 2008 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 #include <linux/gpio.h>
23
24 #include <asm/mach/pci.h>
25 #include <asm/mach-types.h>
26
27 #include <asm/hardware/it8152.h>
28
29 unsigned long it8152_base_address;
30 static int cmx2xx_it8152_irq_gpio;
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 cmx2xx_pci_adjust_zones(unsigned long *zone_size,
39         unsigned long *zhole_size)
40 {
41         unsigned int sz = SZ_64M >> PAGE_SHIFT;
42
43         if (machine_is_armcore()) {
44                 pr_info("Adjusting zones for CM-X2XX\n");
45
46                 /*
47                  * Only adjust if > 64M on current system
48                  */
49                 if (zone_size[0] <= sz)
50                         return;
51
52                 zone_size[1] = zone_size[0] - sz;
53                 zone_size[0] = sz;
54                 zhole_size[1] = zhole_size[0];
55                 zhole_size[0] = 0;
56         }
57 }
58
59 static void cmx2xx_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
60 {
61         /* clear our parent irq */
62         desc->irq_data.chip->irq_ack(&desc->irq_data);
63
64         it8152_irq_demux(irq, desc);
65 }
66
67 void __cmx2xx_pci_init_irq(int irq_gpio)
68 {
69         it8152_init_irq();
70
71         cmx2xx_it8152_irq_gpio = irq_gpio;
72
73         irq_set_irq_type(gpio_to_irq(irq_gpio), IRQ_TYPE_EDGE_RISING);
74
75         irq_set_chained_handler(gpio_to_irq(irq_gpio),
76                                 cmx2xx_it8152_irq_demux);
77 }
78
79 #ifdef CONFIG_PM
80 static unsigned long sleep_save_ite[10];
81
82 void __cmx2xx_pci_suspend(void)
83 {
84         /* save ITE state */
85         sleep_save_ite[0] = __raw_readl(IT8152_INTC_PDCNIMR);
86         sleep_save_ite[1] = __raw_readl(IT8152_INTC_LPCNIMR);
87         sleep_save_ite[2] = __raw_readl(IT8152_INTC_LPNIAR);
88
89         /* Clear ITE IRQ's */
90         __raw_writel((0), IT8152_INTC_PDCNIRR);
91         __raw_writel((0), IT8152_INTC_LPCNIRR);
92 }
93
94 void __cmx2xx_pci_resume(void)
95 {
96         /* restore IT8152 state */
97         __raw_writel((sleep_save_ite[0]), IT8152_INTC_PDCNIMR);
98         __raw_writel((sleep_save_ite[1]), IT8152_INTC_LPCNIMR);
99         __raw_writel((sleep_save_ite[2]), IT8152_INTC_LPNIAR);
100 }
101 #else
102 void cmx2xx_pci_suspend(void) {}
103 void cmx2xx_pci_resume(void) {}
104 #endif
105
106 /* PCI IRQ mapping*/
107 static int __init cmx2xx_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
108 {
109         int irq;
110
111         dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __func__, slot, pin);
112
113         irq = it8152_pci_map_irq(dev, slot, pin);
114         if (irq)
115                 return irq;
116
117         /*
118           Here comes the ugly part. The routing is baseboard specific,
119           but defining a platform for each possible base of CM-X2XX is
120           unrealistic. Here we keep mapping for ATXBase and SB-X2XX.
121         */
122         /* ATXBASE PCI slot */
123         if (slot == 7)
124                 return IT8152_PCI_INTA;
125
126         /* ATXBase/SB-X2XX CardBus */
127         if (slot == 8 || slot == 0)
128                 return IT8152_PCI_INTB;
129
130         /* ATXBase Ethernet */
131         if (slot == 9)
132                 return IT8152_PCI_INTA;
133
134         /* CM-x255 Onboard Ethernet */
135         if (slot == 15)
136                 return IT8152_PCI_INTC;
137
138         /* SB-x2xx Ethernet */
139         if (slot == 16)
140                 return IT8152_PCI_INTA;
141
142         /* PC104+ interrupt routing */
143         if ((slot == 17) || (slot == 19))
144                 return IT8152_PCI_INTA;
145         if ((slot == 18) || (slot == 20))
146                 return IT8152_PCI_INTB;
147
148         return(0);
149 }
150
151 static void cmx2xx_pci_preinit(void)
152 {
153         pr_info("Initializing CM-X2XX PCI subsystem\n");
154
155         __raw_writel(0x800, IT8152_PCI_CFG_ADDR);
156         if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) {
157                 pr_info("PCI Bridge found.\n");
158
159                 /* set PCI I/O base at 0 */
160                 writel(0x848, IT8152_PCI_CFG_ADDR);
161                 writel(0, IT8152_PCI_CFG_DATA);
162
163                 /* set PCI memory base at 0 */
164                 writel(0x840, IT8152_PCI_CFG_ADDR);
165                 writel(0, IT8152_PCI_CFG_DATA);
166
167                 writel(0x20, IT8152_GPIO_GPDR);
168
169                 /* CardBus Controller on ATXbase baseboard */
170                 writel(0x4000, IT8152_PCI_CFG_ADDR);
171                 if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) {
172                         pr_info("CardBus Bridge found.\n");
173
174                         /* Configure socket 0 */
175                         writel(0x408C, IT8152_PCI_CFG_ADDR);
176                         writel(0x1022, IT8152_PCI_CFG_DATA);
177
178                         writel(0x4080, IT8152_PCI_CFG_ADDR);
179                         writel(0x3844d060, IT8152_PCI_CFG_DATA);
180
181                         writel(0x4090, IT8152_PCI_CFG_ADDR);
182                         writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
183                                 0x60440000),
184                                IT8152_PCI_CFG_DATA);
185
186                         writel(0x4018, IT8152_PCI_CFG_ADDR);
187                         writel(0xb0000000, IT8152_PCI_CFG_DATA);
188
189                         /* Configure socket 1 */
190                         writel(0x418C, IT8152_PCI_CFG_ADDR);
191                         writel(0x1022, IT8152_PCI_CFG_DATA);
192
193                         writel(0x4180, IT8152_PCI_CFG_ADDR);
194                         writel(0x3844d060, IT8152_PCI_CFG_DATA);
195
196                         writel(0x4190, IT8152_PCI_CFG_ADDR);
197                         writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
198                                 0x60440000),
199                                IT8152_PCI_CFG_DATA);
200
201                         writel(0x4118, IT8152_PCI_CFG_ADDR);
202                         writel(0xb0000000, IT8152_PCI_CFG_DATA);
203                 }
204         }
205 }
206
207 static struct hw_pci cmx2xx_pci __initdata = {
208         .swizzle        = pci_std_swizzle,
209         .map_irq        = cmx2xx_pci_map_irq,
210         .nr_controllers = 1,
211         .setup          = it8152_pci_setup,
212         .scan           = it8152_pci_scan_bus,
213         .preinit        = cmx2xx_pci_preinit,
214 };
215
216 static int __init cmx2xx_init_pci(void)
217 {
218         if (machine_is_armcore())
219                 pci_common_init(&cmx2xx_pci);
220
221         return 0;
222 }
223
224 subsys_initcall(cmx2xx_init_pci);