arch/arm/mach-pxa/cm-x2xx-pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/arm/mach-pxa/cm-x2xx-pci.c
   4  *
   5  * PCI bios-type initialisation for PCI machines
   6  *
   7  * Bits taken from various places.
   8  *
   9  * Copyright (C) 2007, 2008 Compulab, Ltd.
  10  * Mike Rapoport <mike@compulab.co.il>
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/pci.h>
  15 #include <linux/init.h>
  16 #include <linux/device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/irq.h>
  19 #include <linux/gpio.h>
  20
  21 #include <asm/mach/pci.h>
  22 #include <asm/mach-types.h>
  23
  24 #include <asm/hardware/it8152.h>
  25
  26 void __iomem *it8152_base_address;
  27 static int cmx2xx_it8152_irq_gpio;
  28
  29 static void cmx2xx_it8152_irq_demux(struct irq_desc *desc)
  30 {
  31         /* clear our parent irq */
  32         desc->irq_data.chip->irq_ack(&desc->irq_data);
  33
  34         it8152_irq_demux(desc);
  35 }
  36
  37 void __cmx2xx_pci_init_irq(int irq_gpio)
  38 {
  39         it8152_init_irq();
  40
  41         cmx2xx_it8152_irq_gpio = irq_gpio;
  42
  43         irq_set_irq_type(gpio_to_irq(irq_gpio), IRQ_TYPE_EDGE_RISING);
  44
  45         irq_set_chained_handler(gpio_to_irq(irq_gpio),
  46                                 cmx2xx_it8152_irq_demux);
  47 }
  48
  49 #ifdef CONFIG_PM
  50 static unsigned long sleep_save_ite[10];
  51
  52 void __cmx2xx_pci_suspend(void)
  53 {
  54         /* save ITE state */
  55         sleep_save_ite[0] = __raw_readl(IT8152_INTC_PDCNIMR);
  56         sleep_save_ite[1] = __raw_readl(IT8152_INTC_LPCNIMR);
  57         sleep_save_ite[2] = __raw_readl(IT8152_INTC_LPNIAR);
  58
  59         /* Clear ITE IRQ's */
  60         __raw_writel((0), IT8152_INTC_PDCNIRR);
  61         __raw_writel((0), IT8152_INTC_LPCNIRR);
  62 }
  63
  64 void __cmx2xx_pci_resume(void)
  65 {
  66         /* restore IT8152 state */
  67         __raw_writel((sleep_save_ite[0]), IT8152_INTC_PDCNIMR);
  68         __raw_writel((sleep_save_ite[1]), IT8152_INTC_LPCNIMR);
  69         __raw_writel((sleep_save_ite[2]), IT8152_INTC_LPNIAR);
  70 }
  71 #else
  72 void cmx2xx_pci_suspend(void) {}
  73 void cmx2xx_pci_resume(void) {}
  74 #endif
  75
  76 /* PCI IRQ mapping*/
  77 static int __init cmx2xx_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  78 {
  79         int irq;
  80
  81         dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __func__, slot, pin);
  82
  83         irq = it8152_pci_map_irq(dev, slot, pin);
  84         if (irq)
  85                 return irq;
  86
  87         /*
  88           Here comes the ugly part. The routing is baseboard specific,
  89           but defining a platform for each possible base of CM-X2XX is
  90           unrealistic. Here we keep mapping for ATXBase and SB-X2XX.
  91         */
  92         /* ATXBASE PCI slot */
  93         if (slot == 7)
  94                 return IT8152_PCI_INTA;
  95
  96         /* ATXBase/SB-X2XX CardBus */
  97         if (slot == 8 || slot == 0)
  98                 return IT8152_PCI_INTB;
  99
 100         /* ATXBase Ethernet */
 101         if (slot == 9)
 102                 return IT8152_PCI_INTA;
 103
 104         /* CM-x255 Onboard Ethernet */
 105         if (slot == 15)
 106                 return IT8152_PCI_INTC;
 107
 108         /* SB-x2xx Ethernet */
 109         if (slot == 16)
 110                 return IT8152_PCI_INTA;
 111
 112         /* PC104+ interrupt routing */
 113         if ((slot == 17) || (slot == 19))
 114                 return IT8152_PCI_INTA;
 115         if ((slot == 18) || (slot == 20))
 116                 return IT8152_PCI_INTB;
 117
 118         return(0);
 119 }
 120
 121 static void cmx2xx_pci_preinit(void)
 122 {
 123         pr_info("Initializing CM-X2XX PCI subsystem\n");
 124
 125         pcibios_min_io = 0;
 126         pcibios_min_mem = 0;
 127
 128         __raw_writel(0x800, IT8152_PCI_CFG_ADDR);
 129         if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) {
 130                 pr_info("PCI Bridge found.\n");
 131
 132                 /* set PCI I/O base at 0 */
 133                 writel(0x848, IT8152_PCI_CFG_ADDR);
 134                 writel(0, IT8152_PCI_CFG_DATA);
 135
 136                 /* set PCI memory base at 0 */
 137                 writel(0x840, IT8152_PCI_CFG_ADDR);
 138                 writel(0, IT8152_PCI_CFG_DATA);
 139
 140                 writel(0x20, IT8152_GPIO_GPDR);
 141
 142                 /* CardBus Controller on ATXbase baseboard */
 143                 writel(0x4000, IT8152_PCI_CFG_ADDR);
 144                 if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) {
 145                         pr_info("CardBus Bridge found.\n");
 146
 147                         /* Configure socket 0 */
 148                         writel(0x408C, IT8152_PCI_CFG_ADDR);
 149                         writel(0x1022, IT8152_PCI_CFG_DATA);
 150
 151                         writel(0x4080, IT8152_PCI_CFG_ADDR);
 152                         writel(0x3844d060, IT8152_PCI_CFG_DATA);
 153
 154                         writel(0x4090, IT8152_PCI_CFG_ADDR);
 155                         writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
 156                                 0x60440000),
 157                                IT8152_PCI_CFG_DATA);
 158
 159                         writel(0x4018, IT8152_PCI_CFG_ADDR);
 160                         writel(0xb0000000, IT8152_PCI_CFG_DATA);
 161
 162                         /* Configure socket 1 */
 163                         writel(0x418C, IT8152_PCI_CFG_ADDR);
 164                         writel(0x1022, IT8152_PCI_CFG_DATA);
 165
 166                         writel(0x4180, IT8152_PCI_CFG_ADDR);
 167                         writel(0x3844d060, IT8152_PCI_CFG_DATA);
 168
 169                         writel(0x4190, IT8152_PCI_CFG_ADDR);
 170                         writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
 171                                 0x60440000),
 172                                IT8152_PCI_CFG_DATA);
 173
 174                         writel(0x4118, IT8152_PCI_CFG_ADDR);
 175                         writel(0xb0000000, IT8152_PCI_CFG_DATA);
 176                 }
 177         }
 178 }
 179
 180 static struct hw_pci cmx2xx_pci __initdata = {
 181         .map_irq        = cmx2xx_pci_map_irq,
 182         .nr_controllers = 1,
 183         .ops            = &it8152_ops,
 184         .setup          = it8152_pci_setup,
 185         .preinit        = cmx2xx_pci_preinit,
 186 };
 187
 188 static int __init cmx2xx_init_pci(void)
 189 {
 190         if (machine_is_armcore())
 191                 pci_common_init(&cmx2xx_pci);
 192
 193         return 0;
 194 }
 195
 196 subsys_initcall(cmx2xx_init_pci);