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 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>
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>
28 #include <asm/hardware/it8152.h>
30 unsigned long it8152_base_address = CMX270_IT8152_VIRT;
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.
38 void __init cmx270_pci_adjust_zones(int node, unsigned long *zone_size,
39 unsigned long *zhole_size)
41 unsigned int sz = SZ_64M >> PAGE_SHIFT;
43 pr_info("Adjusting zones for CM-x270\n");
46 * Only adjust if > 64M on current system
48 if (node || (zone_size[0] <= sz))
51 zone_size[1] = zone_size[0] - sz;
53 zhole_size[1] = zhole_size[0];
57 static void cmx270_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
59 /* clear our parent irq */
60 GEDR(GPIO_IT8152_IRQ) = GPIO_bit(GPIO_IT8152_IRQ);
62 it8152_irq_demux(irq, desc);
65 void __cmx270_pci_init_irq(void)
68 pxa_gpio_mode(IRQ_TO_GPIO(GPIO_IT8152_IRQ));
69 set_irq_type(IRQ_GPIO(GPIO_IT8152_IRQ), IRQT_RISING);
71 set_irq_chained_handler(IRQ_GPIO(GPIO_IT8152_IRQ),
72 cmx270_it8152_irq_demux);
76 static unsigned long sleep_save_ite[10];
78 void __cmx270_pci_suspend(void)
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);
86 __raw_writel((0), IT8152_INTC_PDCNIRR);
87 __raw_writel((0), IT8152_INTC_LPCNIRR);
90 void __cmx270_pci_resume(void)
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);
98 void cmx270_pci_suspend(void) {}
99 void cmx270_pci_resume(void) {}
103 static int __init cmx270_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
107 dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __FUNCTION__, slot, pin);
109 irq = it8152_pci_map_irq(dev, slot, pin);
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.
118 /* ATXBASE PCI slot */
120 return IT8152_PCI_INTA;
122 /* ATXBase/SB-x270 CardBus */
123 if (slot == 8 || slot == 0)
124 return IT8152_PCI_INTB;
126 /* ATXBase Ethernet */
128 return IT8152_PCI_INTA;
130 /* SB-x270 Ethernet */
132 return IT8152_PCI_INTA;
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;
143 static void cmx270_pci_preinit(void)
145 pr_info("Initializing CM-X270 PCI subsystem\n");
147 __raw_writel(0x800, IT8152_PCI_CFG_ADDR);
148 if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) {
149 pr_info("PCI Bridge found.\n");
151 /* set PCI I/O base at 0 */
152 writel(0x848, IT8152_PCI_CFG_ADDR);
153 writel(0, IT8152_PCI_CFG_DATA);
155 /* set PCI memory base at 0 */
156 writel(0x840, IT8152_PCI_CFG_ADDR);
157 writel(0, IT8152_PCI_CFG_DATA);
159 writel(0x20, IT8152_GPIO_GPDR);
161 /* CardBus Controller on ATXbase baseboard */
162 writel(0x4000, IT8152_PCI_CFG_ADDR);
163 if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) {
164 pr_info("CardBus Bridge found.\n");
166 /* Configure socket 0 */
167 writel(0x408C, IT8152_PCI_CFG_ADDR);
168 writel(0x1022, IT8152_PCI_CFG_DATA);
170 writel(0x4080, IT8152_PCI_CFG_ADDR);
171 writel(0x3844d060, IT8152_PCI_CFG_DATA);
173 writel(0x4090, IT8152_PCI_CFG_ADDR);
174 writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
176 IT8152_PCI_CFG_DATA);
178 writel(0x4018, IT8152_PCI_CFG_ADDR);
179 writel(0xb0000000, IT8152_PCI_CFG_DATA);
181 /* Configure socket 1 */
182 writel(0x418C, IT8152_PCI_CFG_ADDR);
183 writel(0x1022, IT8152_PCI_CFG_DATA);
185 writel(0x4180, IT8152_PCI_CFG_ADDR);
186 writel(0x3844d060, IT8152_PCI_CFG_DATA);
188 writel(0x4190, IT8152_PCI_CFG_ADDR);
189 writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
191 IT8152_PCI_CFG_DATA);
193 writel(0x4118, IT8152_PCI_CFG_ADDR);
194 writel(0xb0000000, IT8152_PCI_CFG_DATA);
199 static struct hw_pci cmx270_pci __initdata = {
200 .swizzle = pci_std_swizzle,
201 .map_irq = cmx270_pci_map_irq,
203 .setup = it8152_pci_setup,
204 .scan = it8152_pci_scan_bus,
205 .preinit = cmx270_pci_preinit,
208 static int __init cmx270_init_pci(void)
210 if (machine_is_armcore())
211 pci_common_init(&cmx270_pci);
216 subsys_initcall(cmx270_init_pci);