arch/arm/mach-mx5/board-mx51_babbage.c

   1 /*
   2  * Copyright 2009 Freescale Semiconductor, Inc. All Rights Reserved.
   3  * Copyright (C) 2009-2010 Amit Kucheria <amit.kucheria@canonical.com>
   4  *
   5  * The code contained herein is licensed under the GNU General Public
   6  * License. You may obtain a copy of the GNU General Public License
   7  * Version 2 or later at the following locations:
   8  *
   9  * http://www.opensource.org/licenses/gpl-license.html
  10  * http://www.gnu.org/copyleft/gpl.html
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/i2c.h>
  16 #include <linux/gpio.h>
  17 #include <linux/delay.h>
  18 #include <linux/io.h>
  19 #include <linux/fsl_devices.h>
  20
  21 #include <mach/common.h>
  22 #include <mach/hardware.h>
  23 #include <mach/imx-uart.h>
  24 #include <mach/iomux-mx51.h>
  25 #include <mach/i2c.h>
  26 #include <mach/mxc_ehci.h>
  27
  28 #include <asm/irq.h>
  29 #include <asm/setup.h>
  30 #include <asm/mach-types.h>
  31 #include <asm/mach/arch.h>
  32 #include <asm/mach/time.h>
  33
  34 #include "devices.h"
  35
  36 #define BABBAGE_USB_HUB_RESET   (0*32 + 7)      /* GPIO_1_7 */
  37 #define BABBAGE_USBH1_STP       (0*32 + 27)     /* GPIO_1_27 */
  38 #define BABBAGE_PHY_RESET (1*32 +5)     /* GPIO_2_5 */
  39
  40 /* USB_CTRL_1 */
  41 #define MX51_USB_CTRL_1_OFFSET                  0x10
  42 #define MX51_USB_CTRL_UH1_EXT_CLK_EN            (1 << 25)
  43
  44 #define MX51_USB_PLLDIV_12_MHZ          0x00
  45 #define MX51_USB_PLL_DIV_19_2_MHZ       0x01
  46 #define MX51_USB_PLL_DIV_24_MHZ 0x02
  47
  48 static struct platform_device *devices[] __initdata = {
  49         &mxc_fec_device,
  50 };
  51
  52 static struct pad_desc mx51babbage_pads[] = {
  53         /* UART1 */
  54         MX51_PAD_UART1_RXD__UART1_RXD,
  55         MX51_PAD_UART1_TXD__UART1_TXD,
  56         MX51_PAD_UART1_RTS__UART1_RTS,
  57         MX51_PAD_UART1_CTS__UART1_CTS,
  58
  59         /* UART2 */
  60         MX51_PAD_UART2_RXD__UART2_RXD,
  61         MX51_PAD_UART2_TXD__UART2_TXD,
  62
  63         /* UART3 */
  64         MX51_PAD_EIM_D25__UART3_RXD,
  65         MX51_PAD_EIM_D26__UART3_TXD,
  66         MX51_PAD_EIM_D27__UART3_RTS,
  67         MX51_PAD_EIM_D24__UART3_CTS,
  68
  69         /* I2C1 */
  70         MX51_PAD_EIM_D16__I2C1_SDA,
  71         MX51_PAD_EIM_D19__I2C1_SCL,
  72
  73         /* I2C2 */
  74         MX51_PAD_KEY_COL4__I2C2_SCL,
  75         MX51_PAD_KEY_COL5__I2C2_SDA,
  76
  77         /* HSI2C */
  78         MX51_PAD_I2C1_CLK__HSI2C_CLK,
  79         MX51_PAD_I2C1_DAT__HSI2C_DAT,
  80
  81         /* USB HOST1 */
  82         MX51_PAD_USBH1_CLK__USBH1_CLK,
  83         MX51_PAD_USBH1_DIR__USBH1_DIR,
  84         MX51_PAD_USBH1_NXT__USBH1_NXT,
  85         MX51_PAD_USBH1_DATA0__USBH1_DATA0,
  86         MX51_PAD_USBH1_DATA1__USBH1_DATA1,
  87         MX51_PAD_USBH1_DATA2__USBH1_DATA2,
  88         MX51_PAD_USBH1_DATA3__USBH1_DATA3,
  89         MX51_PAD_USBH1_DATA4__USBH1_DATA4,
  90         MX51_PAD_USBH1_DATA5__USBH1_DATA5,
  91         MX51_PAD_USBH1_DATA6__USBH1_DATA6,
  92         MX51_PAD_USBH1_DATA7__USBH1_DATA7,
  93
  94         /* USB HUB reset line*/
  95         MX51_PAD_GPIO_1_7__GPIO1_7,
  96 };
  97
  98 /* Serial ports */
  99 #if defined(CONFIG_SERIAL_IMX) || defined(CONFIG_SERIAL_IMX_MODULE)
 100 static struct imxuart_platform_data uart_pdata = {
 101         .flags = IMXUART_HAVE_RTSCTS,
 102 };
 103
 104 static inline void mxc_init_imx_uart(void)
 105 {
 106         mxc_register_device(&mxc_uart_device0, &uart_pdata);
 107         mxc_register_device(&mxc_uart_device1, &uart_pdata);
 108         mxc_register_device(&mxc_uart_device2, &uart_pdata);
 109 }
 110 #else /* !SERIAL_IMX */
 111 static inline void mxc_init_imx_uart(void)
 112 {
 113 }
 114 #endif /* SERIAL_IMX */
 115
 116 static struct imxi2c_platform_data babbage_i2c_data = {
 117         .bitrate = 100000,
 118 };
 119
 120 static struct imxi2c_platform_data babbage_hsi2c_data = {
 121         .bitrate = 400000,
 122 };
 123
 124 static int gpio_usbh1_active(void)
 125 {
 126         struct pad_desc usbh1stp_gpio = MX51_PAD_USBH1_STP__GPIO_1_27;
 127         struct pad_desc phyreset_gpio = MX51_PAD_EIM_D21__GPIO_2_5;
 128         int ret;
 129
 130         /* Set USBH1_STP to GPIO and toggle it */
 131         mxc_iomux_v3_setup_pad(&usbh1stp_gpio);
 132         ret = gpio_request(BABBAGE_USBH1_STP, "usbh1_stp");
 133
 134         if (ret) {
 135                 pr_debug("failed to get MX51_PAD_USBH1_STP__GPIO_1_27: %d\n", ret);
 136                 return ret;
 137         }
 138         gpio_direction_output(BABBAGE_USBH1_STP, 0);
 139         gpio_set_value(BABBAGE_USBH1_STP, 1);
 140         msleep(100);
 141         gpio_free(BABBAGE_USBH1_STP);
 142
 143         /* De-assert USB PHY RESETB */
 144         mxc_iomux_v3_setup_pad(&phyreset_gpio);
 145         ret = gpio_request(BABBAGE_PHY_RESET, "phy_reset");
 146
 147         if (ret) {
 148                 pr_debug("failed to get MX51_PAD_EIM_D21__GPIO_2_5: %d\n", ret);
 149                 return ret;
 150         }
 151         gpio_direction_output(BABBAGE_PHY_RESET, 1);
 152         return 0;
 153 }
 154
 155 static inline void babbage_usbhub_reset(void)
 156 {
 157         int ret;
 158
 159         /* Bring USB hub out of reset */
 160         ret = gpio_request(BABBAGE_USB_HUB_RESET, "GPIO1_7");
 161         if (ret) {
 162                 printk(KERN_ERR"failed to get GPIO_USB_HUB_RESET: %d\n", ret);
 163                 return;
 164         }
 165         gpio_direction_output(BABBAGE_USB_HUB_RESET, 0);
 166
 167         /* USB HUB RESET - De-assert USB HUB RESET_N */
 168         msleep(1);
 169         gpio_set_value(BABBAGE_USB_HUB_RESET, 0);
 170         msleep(1);
 171         gpio_set_value(BABBAGE_USB_HUB_RESET, 1);
 172 }
 173
 174 /* This function is board specific as the bit mask for the plldiv will also
 175 be different for other Freescale SoCs, thus a common bitmask is not
 176 possible and cannot get place in /plat-mxc/ehci.c.*/
 177 static int initialize_otg_port(struct platform_device *pdev)
 178 {
 179         u32 v;
 180         void __iomem *usb_base;
 181         u32 usbother_base;
 182
 183         usb_base = ioremap(MX51_OTG_BASE_ADDR, SZ_4K);
 184         usbother_base = usb_base + MX5_USBOTHER_REGS_OFFSET;
 185
 186         /* Set the PHY clock to 19.2MHz */
 187         v = __raw_readl(usbother_base + MXC_USB_PHY_CTR_FUNC2_OFFSET);
 188         v &= ~MX5_USB_UTMI_PHYCTRL1_PLLDIV_MASK;
 189         v |= MX51_USB_PLL_DIV_19_2_MHZ;
 190         __raw_writel(v, usbother_base + MXC_USB_PHY_CTR_FUNC2_OFFSET);
 191         iounmap(usb_base);
 192         return 0;
 193 }
 194
 195 static int initialize_usbh1_port(struct platform_device *pdev)
 196 {
 197         u32 v;
 198         void __iomem *usb_base;
 199         u32 usbother_base;
 200
 201         usb_base = ioremap(MX51_OTG_BASE_ADDR, SZ_4K);
 202         usbother_base = usb_base + MX5_USBOTHER_REGS_OFFSET;
 203
 204         /* The clock for the USBH1 ULPI port will come externally from the PHY. */
 205         v = __raw_readl(usbother_base + MX51_USB_CTRL_1_OFFSET);
 206         __raw_writel(v | MX51_USB_CTRL_UH1_EXT_CLK_EN, usbother_base + MX51_USB_CTRL_1_OFFSET);
 207         iounmap(usb_base);
 208         return 0;
 209 }
 210
 211 static struct mxc_usbh_platform_data dr_utmi_config = {
 212         .init           = initialize_otg_port,
 213         .portsc = MXC_EHCI_UTMI_16BIT,
 214         .flags  = MXC_EHCI_INTERNAL_PHY,
 215 };
 216
 217 static struct fsl_usb2_platform_data usb_pdata = {
 218         .operating_mode = FSL_USB2_DR_DEVICE,
 219         .phy_mode       = FSL_USB2_PHY_UTMI_WIDE,
 220 };
 221
 222 static struct mxc_usbh_platform_data usbh1_config = {
 223         .init           = initialize_usbh1_port,
 224         .portsc = MXC_EHCI_MODE_ULPI,
 225         .flags  = (MXC_EHCI_POWER_PINS_ENABLED | MXC_EHCI_ITC_NO_THRESHOLD),
 226 };
 227
 228 static int otg_mode_host;
 229
 230 static int __init babbage_otg_mode(char *options)
 231 {
 232         if (!strcmp(options, "host"))
 233                 otg_mode_host = 1;
 234         else if (!strcmp(options, "device"))
 235                 otg_mode_host = 0;
 236         else
 237                 pr_info("otg_mode neither \"host\" nor \"device\". "
 238                         "Defaulting to device\n");
 239         return 0;
 240 }
 241 __setup("otg_mode=", babbage_otg_mode);
 242
 243 /*
 244  * Board specific initialization.
 245  */
 246 static void __init mxc_board_init(void)
 247 {
 248         struct pad_desc usbh1stp = MX51_PAD_USBH1_STP__USBH1_STP;
 249
 250         mxc_iomux_v3_setup_multiple_pads(mx51babbage_pads,
 251                                         ARRAY_SIZE(mx51babbage_pads));
 252         mxc_init_imx_uart();
 253         platform_add_devices(devices, ARRAY_SIZE(devices));
 254
 255         mxc_register_device(&mxc_i2c_device0, &babbage_i2c_data);
 256         mxc_register_device(&mxc_i2c_device1, &babbage_i2c_data);
 257         mxc_register_device(&mxc_hsi2c_device, &babbage_hsi2c_data);
 258
 259         if (otg_mode_host)
 260                 mxc_register_device(&mxc_usbdr_host_device, &dr_utmi_config);
 261         else {
 262                 initialize_otg_port(NULL);
 263                 mxc_register_device(&mxc_usbdr_udc_device, &usb_pdata);
 264         }
 265
 266         gpio_usbh1_active();
 267         mxc_register_device(&mxc_usbh1_device, &usbh1_config);
 268         /* setback USBH1_STP to be function */
 269         mxc_iomux_v3_setup_pad(&usbh1stp);
 270         babbage_usbhub_reset();
 271 }
 272
 273 static void __init mx51_babbage_timer_init(void)
 274 {
 275         mx51_clocks_init(32768, 24000000, 22579200, 0);
 276 }
 277
 278 static struct sys_timer mxc_timer = {
 279         .init   = mx51_babbage_timer_init,
 280 };
 281
 282 MACHINE_START(MX51_BABBAGE, "Freescale MX51 Babbage Board")
 283         /* Maintainer: Amit Kucheria <amit.kucheria@canonical.com> */
 284         .phys_io = MX51_AIPS1_BASE_ADDR,
 285         .io_pg_offst = ((MX51_AIPS1_BASE_ADDR_VIRT) >> 18) & 0xfffc,
 286         .boot_params = PHYS_OFFSET + 0x100,
 287         .map_io = mx51_map_io,
 288         .init_irq = mx51_init_irq,
 289         .init_machine = mxc_board_init,
 290         .timer = &mxc_timer,
 291 MACHINE_END