2 * linux/arch/arm/mach-pxa/cm-x270-pci.c
4 * PCI bios-type initialisation for PCI machines
6 * Bits taken from various places.
8 * Copyright (C) 2007, 2008 Compulab, Ltd.
9 * Mike Rapoport <mike@compulab.co.il>
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.
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>
24 #include <asm/mach/pci.h>
25 #include <mach/pxa-regs.h>
26 #include <asm/mach-types.h>
28 #include <asm/hardware/it8152.h>
30 unsigned long it8152_base_address;
31 static int cmx270_it8152_irq_gpio;
34 * Only first 64MB of memory can be accessed via PCI.
35 * We use GFP_DMA to allocate safe buffers to do map/unmap.
36 * This is really ugly and we need a better way of specifying
37 * DMA-capable regions of memory.
39 void __init cmx270_pci_adjust_zones(int node, unsigned long *zone_size,
40 unsigned long *zhole_size)
42 unsigned int sz = SZ_64M >> PAGE_SHIFT;
44 if (machine_is_armcore()) {
45 pr_info("Adjusting zones for CM-X270\n");
48 * Only adjust if > 64M on current system
50 if (node || (zone_size[0] <= sz))
53 zone_size[1] = zone_size[0] - sz;
55 zhole_size[1] = zhole_size[0];
60 static void cmx270_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
62 /* clear our parent irq */
63 GEDR(cmx270_it8152_irq_gpio) = GPIO_bit(cmx270_it8152_irq_gpio);
65 it8152_irq_demux(irq, desc);
68 void __cmx270_pci_init_irq(int irq_gpio)
72 cmx270_it8152_irq_gpio = irq_gpio;
74 set_irq_type(gpio_to_irq(irq_gpio), IRQ_TYPE_EDGE_RISING);
76 set_irq_chained_handler(gpio_to_irq(irq_gpio), cmx270_it8152_irq_demux);
80 static unsigned long sleep_save_ite[10];
82 void __cmx270_pci_suspend(void)
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);
90 __raw_writel((0), IT8152_INTC_PDCNIRR);
91 __raw_writel((0), IT8152_INTC_LPCNIRR);
94 void __cmx270_pci_resume(void)
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);
102 void cmx270_pci_suspend(void) {}
103 void cmx270_pci_resume(void) {}
107 static int __init cmx270_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
111 dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __func__, slot, pin);
113 irq = it8152_pci_map_irq(dev, slot, pin);
118 Here comes the ugly part. The routing is baseboard specific,
119 but defining a platform for each possible base of CM-X270 is
120 unrealistic. Here we keep mapping for ATXBase and SB-X270.
122 /* ATXBASE PCI slot */
124 return IT8152_PCI_INTA;
126 /* ATXBase/SB-x270 CardBus */
127 if (slot == 8 || slot == 0)
128 return IT8152_PCI_INTB;
130 /* ATXBase Ethernet */
132 return IT8152_PCI_INTA;
134 /* SB-x270 Ethernet */
136 return IT8152_PCI_INTA;
138 /* PC104+ interrupt routing */
139 if ((slot == 17) || (slot == 19))
140 return IT8152_PCI_INTA;
141 if ((slot == 18) || (slot == 20))
142 return IT8152_PCI_INTB;
147 static void cmx270_pci_preinit(void)
149 pr_info("Initializing CM-X270 PCI subsystem\n");
151 __raw_writel(0x800, IT8152_PCI_CFG_ADDR);
152 if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) {
153 pr_info("PCI Bridge found.\n");
155 /* set PCI I/O base at 0 */
156 writel(0x848, IT8152_PCI_CFG_ADDR);
157 writel(0, IT8152_PCI_CFG_DATA);
159 /* set PCI memory base at 0 */
160 writel(0x840, IT8152_PCI_CFG_ADDR);
161 writel(0, IT8152_PCI_CFG_DATA);
163 writel(0x20, IT8152_GPIO_GPDR);
165 /* CardBus Controller on ATXbase baseboard */
166 writel(0x4000, IT8152_PCI_CFG_ADDR);
167 if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) {
168 pr_info("CardBus Bridge found.\n");
170 /* Configure socket 0 */
171 writel(0x408C, IT8152_PCI_CFG_ADDR);
172 writel(0x1022, IT8152_PCI_CFG_DATA);
174 writel(0x4080, IT8152_PCI_CFG_ADDR);
175 writel(0x3844d060, IT8152_PCI_CFG_DATA);
177 writel(0x4090, IT8152_PCI_CFG_ADDR);
178 writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
180 IT8152_PCI_CFG_DATA);
182 writel(0x4018, IT8152_PCI_CFG_ADDR);
183 writel(0xb0000000, IT8152_PCI_CFG_DATA);
185 /* Configure socket 1 */
186 writel(0x418C, IT8152_PCI_CFG_ADDR);
187 writel(0x1022, IT8152_PCI_CFG_DATA);
189 writel(0x4180, IT8152_PCI_CFG_ADDR);
190 writel(0x3844d060, IT8152_PCI_CFG_DATA);
192 writel(0x4190, IT8152_PCI_CFG_ADDR);
193 writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
195 IT8152_PCI_CFG_DATA);
197 writel(0x4118, IT8152_PCI_CFG_ADDR);
198 writel(0xb0000000, IT8152_PCI_CFG_DATA);
203 static struct hw_pci cmx270_pci __initdata = {
204 .swizzle = pci_std_swizzle,
205 .map_irq = cmx270_pci_map_irq,
207 .setup = it8152_pci_setup,
208 .scan = it8152_pci_scan_bus,
209 .preinit = cmx270_pci_preinit,
212 static int __init cmx270_init_pci(void)
214 if (machine_is_armcore())
215 pci_common_init(&cmx270_pci);
220 subsys_initcall(cmx270_init_pci);