arch/arm/mach-iop32x/em7210.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mach-iop32x/em7210.c
   4  *
   5  * Board support code for the Lanner EM7210 platforms.
   6  *
   7  * Based on arch/arm/mach-iop32x/iq31244.c file.
   8  *
   9  * Copyright (C) 2007 Arnaud Patard <arnaud.patard@rtp-net.org>
  10  */
  11
  12 #include <linux/mm.h>
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/pci.h>
  16 #include <linux/pm.h>
  17 #include <linux/serial_core.h>
  18 #include <linux/serial_8250.h>
  19 #include <linux/mtd/physmap.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/i2c.h>
  22 #include <linux/gpio.h>
  23 #include <linux/gpio/machine.h>
  24 #include <linux/io.h>
  25 #include <linux/irq.h>
  26 #include <asm/mach/arch.h>
  27 #include <asm/mach/map.h>
  28 #include <asm/mach/pci.h>
  29 #include <asm/mach/time.h>
  30 #include <asm/mach-types.h>
  31
  32 #include "hardware.h"
  33 #include "gpio-iop32x.h"
  34 #include "irqs.h"
  35
  36 static void __init em7210_timer_init(void)
  37 {
  38         /* http://www.kwaak.net/fotos/fotos-nas/slide_24.html */
  39         /* 33.333 MHz crystal.                                */
  40         iop_init_time(200000000);
  41 }
  42
  43 /*
  44  * EM7210 RTC
  45  */
  46 static struct i2c_board_info __initdata em7210_i2c_devices[] = {
  47         {
  48                 I2C_BOARD_INFO("rs5c372a", 0x32),
  49         },
  50 };
  51
  52 /*
  53  * EM7210 I/O
  54  */
  55 static struct map_desc em7210_io_desc[] __initdata = {
  56         {       /* on-board devices */
  57                 .virtual        = IQ31244_UART,
  58                 .pfn            = __phys_to_pfn(IQ31244_UART),
  59                 .length         = 0x00100000,
  60                 .type           = MT_DEVICE,
  61         },
  62 };
  63
  64 void __init em7210_map_io(void)
  65 {
  66         iop3xx_map_io();
  67         iotable_init(em7210_io_desc, ARRAY_SIZE(em7210_io_desc));
  68 }
  69
  70
  71 /*
  72  * EM7210 PCI
  73  */
  74 #define INTA    IRQ_IOP32X_XINT0
  75 #define INTB    IRQ_IOP32X_XINT1
  76 #define INTC    IRQ_IOP32X_XINT2
  77 #define INTD    IRQ_IOP32X_XINT3
  78
  79 static int __init
  80 em7210_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  81 {
  82         static int pci_irq_table[][4] = {
  83                 /*
  84                  * PCI IDSEL/INTPIN->INTLINE
  85                  * A       B       C       D
  86                  */
  87                 {INTB, INTB, INTB, INTB}, /* console / uart */
  88                 {INTA, INTA, INTA, INTA}, /* 1st 82541      */
  89                 {INTD, INTD, INTD, INTD}, /* 2nd 82541      */
  90                 {INTC, INTC, INTC, INTC}, /* GD31244        */
  91                 {INTD, INTA, INTA, INTA}, /* mini-PCI       */
  92                 {INTD, INTC, INTA, INTA}, /* NEC USB        */
  93         };
  94
  95         if (pin < 1 || pin > 4)
  96                 return -1;
  97
  98         return pci_irq_table[slot % 6][pin - 1];
  99 }
 100
 101 static struct hw_pci em7210_pci __initdata = {
 102         .nr_controllers = 1,
 103         .ops            = &iop3xx_ops,
 104         .setup          = iop3xx_pci_setup,
 105         .preinit        = iop3xx_pci_preinit,
 106         .map_irq        = em7210_pci_map_irq,
 107 };
 108
 109 static int __init em7210_pci_init(void)
 110 {
 111         if (machine_is_em7210())
 112                 pci_common_init(&em7210_pci);
 113
 114         return 0;
 115 }
 116
 117 subsys_initcall(em7210_pci_init);
 118
 119
 120 /*
 121  * EM7210 Flash
 122  */
 123 static struct physmap_flash_data em7210_flash_data = {
 124         .width          = 2,
 125 };
 126
 127 static struct resource em7210_flash_resource = {
 128         .start          = 0xf0000000,
 129         .end            = 0xf1ffffff,
 130         .flags          = IORESOURCE_MEM,
 131 };
 132
 133 static struct platform_device em7210_flash_device = {
 134         .name           = "physmap-flash",
 135         .id             = 0,
 136         .dev            = {
 137                 .platform_data  = &em7210_flash_data,
 138         },
 139         .num_resources  = 1,
 140         .resource       = &em7210_flash_resource,
 141 };
 142
 143
 144 /*
 145  * EM7210 UART
 146  * The physical address of the serial port is 0xfe800000,
 147  * so it can be used for physical and virtual address.
 148  */
 149 static struct plat_serial8250_port em7210_serial_port[] = {
 150         {
 151                 .mapbase        = IQ31244_UART,
 152                 .membase        = (char *)IQ31244_UART,
 153                 .irq            = IRQ_IOP32X_XINT1,
 154                 .flags          = UPF_SKIP_TEST,
 155                 .iotype         = UPIO_MEM,
 156                 .regshift       = 0,
 157                 .uartclk        = 1843200,
 158         },
 159         { },
 160 };
 161
 162 static struct resource em7210_uart_resource = {
 163         .start          = IQ31244_UART,
 164         .end            = IQ31244_UART + 7,
 165         .flags          = IORESOURCE_MEM,
 166 };
 167
 168 static struct platform_device em7210_serial_device = {
 169         .name           = "serial8250",
 170         .id             = PLAT8250_DEV_PLATFORM,
 171         .dev            = {
 172                 .platform_data          = em7210_serial_port,
 173         },
 174         .num_resources  = 1,
 175         .resource       = &em7210_uart_resource,
 176 };
 177
 178 #define EM7210_HARDWARE_POWER 0
 179
 180 void em7210_power_off(void)
 181 {
 182         int ret;
 183
 184         ret = gpio_direction_output(EM7210_HARDWARE_POWER, 1);
 185         if (ret)
 186                 pr_crit("could not drive power off GPIO high\n");
 187 }
 188
 189 static int __init em7210_request_gpios(void)
 190 {
 191         int ret;
 192
 193         if (!machine_is_em7210())
 194                 return 0;
 195
 196         ret = gpio_request(EM7210_HARDWARE_POWER, "power");
 197         if (ret) {
 198                 pr_err("could not request power off GPIO\n");
 199                 return 0;
 200         }
 201
 202         pm_power_off = em7210_power_off;
 203
 204         return 0;
 205 }
 206 device_initcall(em7210_request_gpios);
 207
 208 static void __init em7210_init_machine(void)
 209 {
 210         register_iop32x_gpio();
 211         platform_device_register(&em7210_serial_device);
 212         gpiod_add_lookup_table(&iop3xx_i2c0_gpio_lookup);
 213         gpiod_add_lookup_table(&iop3xx_i2c1_gpio_lookup);
 214         platform_device_register(&iop3xx_i2c0_device);
 215         platform_device_register(&iop3xx_i2c1_device);
 216         platform_device_register(&em7210_flash_device);
 217         platform_device_register(&iop3xx_dma_0_channel);
 218         platform_device_register(&iop3xx_dma_1_channel);
 219
 220         i2c_register_board_info(0, em7210_i2c_devices,
 221                 ARRAY_SIZE(em7210_i2c_devices));
 222 }
 223
 224 MACHINE_START(EM7210, "Lanner EM7210")
 225         .atag_offset    = 0x100,
 226         .map_io         = em7210_map_io,
 227         .init_irq       = iop32x_init_irq,
 228         .init_time      = em7210_timer_init,
 229         .init_machine   = em7210_init_machine,
 230         .restart        = iop3xx_restart,
 231 MACHINE_END