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/arch/pxa2xx-gpio.h>
27 #include <asm/mach-types.h>
29 #include <asm/hardware/it8152.h>
31 unsigned long it8152_base_address = CMX270_IT8152_VIRT;
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 pr_info("Adjusting zones for CM-x270\n");
47 * Only adjust if > 64M on current system
49 if (node || (zone_size[0] <= sz))
52 zone_size[1] = zone_size[0] - sz;
54 zhole_size[1] = zhole_size[0];
58 static void cmx270_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
60 /* clear our parent irq */
61 GEDR(GPIO_IT8152_IRQ) = GPIO_bit(GPIO_IT8152_IRQ);
63 it8152_irq_demux(irq, desc);
66 void __cmx270_pci_init_irq(void)
69 pxa_gpio_mode(IRQ_TO_GPIO(GPIO_IT8152_IRQ));
70 set_irq_type(IRQ_GPIO(GPIO_IT8152_IRQ), IRQT_RISING);
72 set_irq_chained_handler(IRQ_GPIO(GPIO_IT8152_IRQ),
73 cmx270_it8152_irq_demux);
77 static unsigned long sleep_save_ite[10];
79 void __cmx270_pci_suspend(void)
82 sleep_save_ite[0] = __raw_readl(IT8152_INTC_PDCNIMR);
83 sleep_save_ite[1] = __raw_readl(IT8152_INTC_LPCNIMR);
84 sleep_save_ite[2] = __raw_readl(IT8152_INTC_LPNIAR);
87 __raw_writel((0), IT8152_INTC_PDCNIRR);
88 __raw_writel((0), IT8152_INTC_LPCNIRR);
91 void __cmx270_pci_resume(void)
93 /* restore IT8152 state */
94 __raw_writel((sleep_save_ite[0]), IT8152_INTC_PDCNIMR);
95 __raw_writel((sleep_save_ite[1]), IT8152_INTC_LPCNIMR);
96 __raw_writel((sleep_save_ite[2]), IT8152_INTC_LPNIAR);
99 void cmx270_pci_suspend(void) {}
100 void cmx270_pci_resume(void) {}
104 static int __init cmx270_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
108 dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __func__, slot, pin);
110 irq = it8152_pci_map_irq(dev, slot, pin);
115 Here comes the ugly part. The routing is baseboard specific,
116 but defining a platform for each possible base of CM-x270 is
117 unrealistic. Here we keep mapping for ATXBase and SB-x270.
119 /* ATXBASE PCI slot */
121 return IT8152_PCI_INTA;
123 /* ATXBase/SB-x270 CardBus */
124 if (slot == 8 || slot == 0)
125 return IT8152_PCI_INTB;
127 /* ATXBase Ethernet */
129 return IT8152_PCI_INTA;
131 /* SB-x270 Ethernet */
133 return IT8152_PCI_INTA;
135 /* PC104+ interrupt routing */
136 if ((slot == 17) || (slot == 19))
137 return IT8152_PCI_INTA;
138 if ((slot == 18) || (slot == 20))
139 return IT8152_PCI_INTB;
144 static void cmx270_pci_preinit(void)
146 pr_info("Initializing CM-X270 PCI subsystem\n");
148 __raw_writel(0x800, IT8152_PCI_CFG_ADDR);
149 if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) {
150 pr_info("PCI Bridge found.\n");
152 /* set PCI I/O base at 0 */
153 writel(0x848, IT8152_PCI_CFG_ADDR);
154 writel(0, IT8152_PCI_CFG_DATA);
156 /* set PCI memory base at 0 */
157 writel(0x840, IT8152_PCI_CFG_ADDR);
158 writel(0, IT8152_PCI_CFG_DATA);
160 writel(0x20, IT8152_GPIO_GPDR);
162 /* CardBus Controller on ATXbase baseboard */
163 writel(0x4000, IT8152_PCI_CFG_ADDR);
164 if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) {
165 pr_info("CardBus Bridge found.\n");
167 /* Configure socket 0 */
168 writel(0x408C, IT8152_PCI_CFG_ADDR);
169 writel(0x1022, IT8152_PCI_CFG_DATA);
171 writel(0x4080, IT8152_PCI_CFG_ADDR);
172 writel(0x3844d060, IT8152_PCI_CFG_DATA);
174 writel(0x4090, IT8152_PCI_CFG_ADDR);
175 writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
177 IT8152_PCI_CFG_DATA);
179 writel(0x4018, IT8152_PCI_CFG_ADDR);
180 writel(0xb0000000, IT8152_PCI_CFG_DATA);
182 /* Configure socket 1 */
183 writel(0x418C, IT8152_PCI_CFG_ADDR);
184 writel(0x1022, IT8152_PCI_CFG_DATA);
186 writel(0x4180, IT8152_PCI_CFG_ADDR);
187 writel(0x3844d060, IT8152_PCI_CFG_DATA);
189 writel(0x4190, IT8152_PCI_CFG_ADDR);
190 writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
192 IT8152_PCI_CFG_DATA);
194 writel(0x4118, IT8152_PCI_CFG_ADDR);
195 writel(0xb0000000, IT8152_PCI_CFG_DATA);
200 static struct hw_pci cmx270_pci __initdata = {
201 .swizzle = pci_std_swizzle,
202 .map_irq = cmx270_pci_map_irq,
204 .setup = it8152_pci_setup,
205 .scan = it8152_pci_scan_bus,
206 .preinit = cmx270_pci_preinit,
209 static int __init cmx270_init_pci(void)
211 if (machine_is_armcore())
212 pci_common_init(&cmx270_pci);
217 subsys_initcall(cmx270_init_pci);