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