arch/arm/mach-nomadik/cpu-8815.c

   1 /*
   2  * Copyright STMicroelectronics, 2007.
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include <linux/types.h>
  20 #include <linux/init.h>
  21 #include <linux/device.h>
  22 #include <linux/amba/bus.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/io.h>
  25 #include <linux/slab.h>
  26 #include <linux/irq.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/of_irq.h>
  29 #include <linux/of_gpio.h>
  30 #include <linux/of_address.h>
  31 #include <linux/of_platform.h>
  32 #include <linux/gpio.h>
  33
  34 #include <asm/mach/arch.h>
  35 #include <asm/mach/map.h>
  36 #include <asm/mach/time.h>
  37 #include <asm/mach-types.h>
  38
  39 #include <asm/cacheflush.h>
  40 #include <asm/hardware/cache-l2x0.h>
  41
  42 /*
  43  * These are the only hard-coded address offsets we still have to use.
  44  */
  45 #define NOMADIK_FSMC_BASE       0x10100000      /* FSMC registers */
  46 #define NOMADIK_SDRAMC_BASE     0x10110000      /* SDRAM Controller */
  47 #define NOMADIK_CLCDC_BASE      0x10120000      /* CLCD Controller */
  48 #define NOMADIK_MDIF_BASE       0x10120000      /* MDIF */
  49 #define NOMADIK_DMA0_BASE       0x10130000      /* DMA0 Controller */
  50 #define NOMADIK_IC_BASE         0x10140000      /* Vectored Irq Controller */
  51 #define NOMADIK_DMA1_BASE       0x10150000      /* DMA1 Controller */
  52 #define NOMADIK_USB_BASE        0x10170000      /* USB-OTG conf reg base */
  53 #define NOMADIK_CRYP_BASE       0x10180000      /* Crypto processor */
  54 #define NOMADIK_SHA1_BASE       0x10190000      /* SHA-1 Processor */
  55 #define NOMADIK_XTI_BASE        0x101A0000      /* XTI */
  56 #define NOMADIK_RNG_BASE        0x101B0000      /* Random number generator */
  57 #define NOMADIK_SRC_BASE        0x101E0000      /* SRC base */
  58 #define NOMADIK_WDOG_BASE       0x101E1000      /* Watchdog */
  59 #define NOMADIK_MTU0_BASE       0x101E2000      /* Multiple Timer 0 */
  60 #define NOMADIK_MTU1_BASE       0x101E3000      /* Multiple Timer 1 */
  61 #define NOMADIK_GPIO0_BASE      0x101E4000      /* GPIO0 */
  62 #define NOMADIK_GPIO1_BASE      0x101E5000      /* GPIO1 */
  63 #define NOMADIK_GPIO2_BASE      0x101E6000      /* GPIO2 */
  64 #define NOMADIK_GPIO3_BASE      0x101E7000      /* GPIO3 */
  65 #define NOMADIK_RTC_BASE        0x101E8000      /* Real Time Clock base */
  66 #define NOMADIK_PMU_BASE        0x101E9000      /* Power Management Unit */
  67 #define NOMADIK_OWM_BASE        0x101EA000      /* One wire master */
  68 #define NOMADIK_SCR_BASE        0x101EF000      /* Secure Control registers */
  69 #define NOMADIK_MSP2_BASE       0x101F0000      /* MSP 2 interface */
  70 #define NOMADIK_MSP1_BASE       0x101F1000      /* MSP 1 interface */
  71 #define NOMADIK_UART2_BASE      0x101F2000      /* UART 2 interface */
  72 #define NOMADIK_SSIRx_BASE      0x101F3000      /* SSI 8-ch rx interface */
  73 #define NOMADIK_SSITx_BASE      0x101F4000      /* SSI 8-ch tx interface */
  74 #define NOMADIK_MSHC_BASE       0x101F5000      /* Memory Stick(Pro) Host */
  75 #define NOMADIK_SDI_BASE        0x101F6000      /* SD-card/MM-Card */
  76 #define NOMADIK_I2C1_BASE       0x101F7000      /* I2C1 interface */
  77 #define NOMADIK_I2C0_BASE       0x101F8000      /* I2C0 interface */
  78 #define NOMADIK_MSP0_BASE       0x101F9000      /* MSP 0 interface */
  79 #define NOMADIK_FIRDA_BASE      0x101FA000      /* FIrDA interface */
  80 #define NOMADIK_UART1_BASE      0x101FB000      /* UART 1 interface */
  81 #define NOMADIK_SSP_BASE        0x101FC000      /* SSP interface */
  82 #define NOMADIK_UART0_BASE      0x101FD000      /* UART 0 interface */
  83 #define NOMADIK_SGA_BASE        0x101FE000      /* SGA interface */
  84 #define NOMADIK_L2CC_BASE       0x10210000      /* L2 Cache controller */
  85 #define NOMADIK_UART1_VBASE     0xF01FB000
  86
  87 /* This is needed for LL-debug/earlyprintk/debug-macro.S */
  88 static struct map_desc cpu8815_io_desc[] __initdata = {
  89         {
  90                 .virtual =      NOMADIK_UART1_VBASE,
  91                 .pfn =          __phys_to_pfn(NOMADIK_UART1_BASE),
  92                 .length =       SZ_4K,
  93                 .type =         MT_DEVICE,
  94         },
  95 };
  96
  97 static void __init cpu8815_map_io(void)
  98 {
  99         iotable_init(cpu8815_io_desc, ARRAY_SIZE(cpu8815_io_desc));
 100 }
 101
 102 static void cpu8815_restart(enum reboot_mode mode, const char *cmd)
 103 {
 104         void __iomem *srcbase = ioremap(NOMADIK_SRC_BASE, SZ_4K);
 105
 106         /* FIXME: use egpio when implemented */
 107
 108         /* Write anything to Reset status register */
 109         writel(1, srcbase + 0x18);
 110 }
 111
 112 /*
 113  * The SMSC911x IRQ is connected to a GPIO pin, but the driver expects
 114  * to simply request an IRQ passed as a resource. So the GPIO pin needs
 115  * to be requested by this hog and set as input.
 116  */
 117 static int __init cpu8815_eth_init(void)
 118 {
 119         struct device_node *eth;
 120         int gpio, irq, err;
 121
 122         eth = of_find_node_by_path("/usb-s8815/ethernet-gpio");
 123         if (!eth) {
 124                 pr_info("could not find any ethernet GPIO\n");
 125                 return 0;
 126         }
 127         gpio = of_get_gpio(eth, 0);
 128         err = gpio_request(gpio, "eth_irq");
 129         if (err) {
 130                 pr_info("failed to request ethernet GPIO\n");
 131                 return -ENODEV;
 132         }
 133         err = gpio_direction_input(gpio);
 134         if (err) {
 135                 pr_info("failed to set ethernet GPIO as input\n");
 136                 return -ENODEV;
 137         }
 138         irq = gpio_to_irq(gpio);
 139         pr_info("enabled USB-S8815 ethernet GPIO %d, IRQ %d\n", gpio, irq);
 140         return 0;
 141 }
 142 device_initcall(cpu8815_eth_init);
 143
 144 /*
 145  * This GPIO pin turns on a line that is used to detect card insertion
 146  * on this board.
 147  */
 148 static int __init cpu8815_mmcsd_init(void)
 149 {
 150         struct device_node *cdbias;
 151         int gpio, err;
 152
 153         cdbias = of_find_node_by_path("/usb-s8815/mmcsd-gpio");
 154         if (!cdbias) {
 155                 pr_info("could not find MMC/SD card detect bias node\n");
 156                 return 0;
 157         }
 158         gpio = of_get_gpio(cdbias, 0);
 159         if (gpio < 0) {
 160                 pr_info("could not obtain MMC/SD card detect bias GPIO\n");
 161                 return 0;
 162         }
 163         err = gpio_request(gpio, "card detect bias");
 164         if (err) {
 165                 pr_info("failed to request card detect bias GPIO %d\n", gpio);
 166                 return -ENODEV;
 167         }
 168         err = gpio_direction_output(gpio, 0);
 169         if (err){
 170                 pr_info("failed to set GPIO %d as output, low\n", gpio);
 171                 return err;
 172         }
 173         pr_info("enabled USB-S8815 CD bias GPIO %d, low\n", gpio);
 174         return 0;
 175 }
 176 device_initcall(cpu8815_mmcsd_init);
 177
 178 static void __init cpu8815_init_of(void)
 179 {
 180 #ifdef CONFIG_CACHE_L2X0
 181         /* At full speed latency must be >=2, so 0x249 in low bits */
 182         l2x0_of_init(0x00730249, 0xfe000fff);
 183 #endif
 184         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 185 }
 186
 187 static const char * cpu8815_board_compat[] = {
 188         "calaosystems,usb-s8815",
 189         NULL,
 190 };
 191
 192 DT_MACHINE_START(NOMADIK_DT, "Nomadik STn8815")
 193         .map_io         = cpu8815_map_io,
 194         .init_machine   = cpu8815_init_of,
 195         .restart        = cpu8815_restart,
 196         .dt_compat      = cpu8815_board_compat,
 197 MACHINE_END