arch/sh/boards/mach-sdk7786/setup.c

   1 /*
   2  * Renesas Technology Europe SDK7786 Support.
   3  *
   4  * Copyright (C) 2010  Matt Fleming
   5  * Copyright (C) 2010  Paul Mundt
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11 #include <linux/init.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/io.h>
  14 #include <linux/smsc911x.h>
  15 #include <linux/i2c.h>
  16 #include <linux/irq.h>
  17 #include <linux/clk.h>
  18 #include <mach/fpga.h>
  19 #include <mach/irq.h>
  20 #include <asm/machvec.h>
  21 #include <asm/heartbeat.h>
  22 #include <asm/sizes.h>
  23 #include <asm/reboot.h>
  24
  25 static struct resource heartbeat_resource = {
  26         .start          = 0x07fff8b0,
  27         .end            = 0x07fff8b0 + sizeof(u16) - 1,
  28         .flags          = IORESOURCE_MEM | IORESOURCE_MEM_16BIT,
  29 };
  30
  31 static struct platform_device heartbeat_device = {
  32         .name           = "heartbeat",
  33         .id             = -1,
  34         .num_resources  = 1,
  35         .resource       = &heartbeat_resource,
  36 };
  37
  38 static struct resource smsc911x_resources[] = {
  39         [0] = {
  40                 .name           = "smsc911x-memory",
  41                 .start          = 0x07ffff00,
  42                 .end            = 0x07ffff00 + SZ_256 - 1,
  43                 .flags          = IORESOURCE_MEM,
  44         },
  45         [1] = {
  46                 .name           = "smsc911x-irq",
  47                 .start          = evt2irq(0x2c0),
  48                 .end            = evt2irq(0x2c0),
  49                 .flags          = IORESOURCE_IRQ,
  50         },
  51 };
  52
  53 static struct smsc911x_platform_config smsc911x_config = {
  54         .irq_polarity   = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
  55         .irq_type       = SMSC911X_IRQ_TYPE_OPEN_DRAIN,
  56         .flags          = SMSC911X_USE_32BIT,
  57         .phy_interface  = PHY_INTERFACE_MODE_MII,
  58 };
  59
  60 static struct platform_device smsc911x_device = {
  61         .name           = "smsc911x",
  62         .id             = -1,
  63         .num_resources  = ARRAY_SIZE(smsc911x_resources),
  64         .resource       = smsc911x_resources,
  65         .dev = {
  66                 .platform_data = &smsc911x_config,
  67         },
  68 };
  69
  70 static struct resource smbus_fpga_resource = {
  71         .start          = 0x07fff9e0,
  72         .end            = 0x07fff9e0 + SZ_32 - 1,
  73         .flags          = IORESOURCE_MEM,
  74 };
  75
  76 static struct platform_device smbus_fpga_device = {
  77         .name           = "i2c-sdk7786",
  78         .id             = 0,
  79         .num_resources  = 1,
  80         .resource       = &smbus_fpga_resource,
  81 };
  82
  83 static struct resource smbus_pcie_resource = {
  84         .start          = 0x07fffc30,
  85         .end            = 0x07fffc30 + SZ_32 - 1,
  86         .flags          = IORESOURCE_MEM,
  87 };
  88
  89 static struct platform_device smbus_pcie_device = {
  90         .name           = "i2c-sdk7786",
  91         .id             = 1,
  92         .num_resources  = 1,
  93         .resource       = &smbus_pcie_resource,
  94 };
  95
  96 static struct i2c_board_info __initdata sdk7786_i2c_devices[] = {
  97         {
  98                 I2C_BOARD_INFO("max6900", 0x68),
  99         },
 100 };
 101
 102 static struct platform_device *sh7786_devices[] __initdata = {
 103         &heartbeat_device,
 104         &smsc911x_device,
 105         &smbus_fpga_device,
 106         &smbus_pcie_device,
 107 };
 108
 109 static int sdk7786_i2c_setup(void)
 110 {
 111         unsigned int tmp;
 112
 113         /*
 114          * Hand over I2C control to the FPGA.
 115          */
 116         tmp = fpga_read_reg(SBCR);
 117         tmp &= ~SCBR_I2CCEN;
 118         tmp |= SCBR_I2CMEN;
 119         fpga_write_reg(tmp, SBCR);
 120
 121         return i2c_register_board_info(0, sdk7786_i2c_devices,
 122                                        ARRAY_SIZE(sdk7786_i2c_devices));
 123 }
 124
 125 static int __init sdk7786_devices_setup(void)
 126 {
 127         int ret;
 128
 129         ret = platform_add_devices(sh7786_devices, ARRAY_SIZE(sh7786_devices));
 130         if (unlikely(ret != 0))
 131                 return ret;
 132
 133         return sdk7786_i2c_setup();
 134 }
 135 __initcall(sdk7786_devices_setup);
 136
 137 static int sdk7786_mode_pins(void)
 138 {
 139         return fpga_read_reg(MODSWR);
 140 }
 141
 142 static int sdk7786_clk_init(void)
 143 {
 144         struct clk *clk;
 145         int ret;
 146
 147         /*
 148          * Only handle the EXTAL case, anyone interfacing a crystal
 149          * resonator will need to provide their own input clock.
 150          */
 151         if (test_mode_pin(MODE_PIN9))
 152                 return -EINVAL;
 153
 154         clk = clk_get(NULL, "extal");
 155         if (!clk || IS_ERR(clk))
 156                 return PTR_ERR(clk);
 157         ret = clk_set_rate(clk, 33333333);
 158         clk_put(clk);
 159
 160         return ret;
 161 }
 162
 163 static void sdk7786_restart(char *cmd)
 164 {
 165         fpga_write_reg(0xa5a5, SRSTR);
 166 }
 167
 168 static void sdk7786_power_off(void)
 169 {
 170         fpga_write_reg(fpga_read_reg(PWRCR) | PWRCR_PDWNREQ, PWRCR);
 171
 172         /*
 173          * It can take up to 20us for the R8C to do its job, back off and
 174          * wait a bit until we've been shut off. Even though newer FPGA
 175          * versions don't set the ACK bit, the latency issue remains.
 176          */
 177         while ((fpga_read_reg(PWRCR) & PWRCR_PDWNACK) == 0)
 178                 cpu_sleep();
 179 }
 180
 181 /* Initialize the board */
 182 static void __init sdk7786_setup(char **cmdline_p)
 183 {
 184         pr_info("Renesas Technology Europe SDK7786 support:\n");
 185
 186         sdk7786_fpga_init();
 187
 188         pr_info("\tPCB revision:\t%d\n", fpga_read_reg(PCBRR) & 0xf);
 189
 190         machine_ops.restart = sdk7786_restart;
 191         pm_power_off = sdk7786_power_off;
 192 }
 193
 194 /*
 195  * The Machine Vector
 196  */
 197 static struct sh_machine_vector mv_sdk7786 __initmv = {
 198         .mv_name                = "SDK7786",
 199         .mv_setup               = sdk7786_setup,
 200         .mv_mode_pins           = sdk7786_mode_pins,
 201         .mv_clk_init            = sdk7786_clk_init,
 202         .mv_init_irq            = sdk7786_init_irq,
 203 };