release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <asm/smp-ops.h>
  25
  26 static struct resource heartbeat_resource = {
  27         .start          = 0x07fff8b0,
  28         .end            = 0x07fff8b0 + sizeof(u16) - 1,
  29         .flags          = IORESOURCE_MEM | IORESOURCE_MEM_16BIT,
  30 };
  31
  32 static struct platform_device heartbeat_device = {
  33         .name           = "heartbeat",
  34         .id             = -1,
  35         .num_resources  = 1,
  36         .resource       = &heartbeat_resource,
  37 };
  38
  39 static struct resource smsc911x_resources[] = {
  40         [0] = {
  41                 .name           = "smsc911x-memory",
  42                 .start          = 0x07ffff00,
  43                 .end            = 0x07ffff00 + SZ_256 - 1,
  44                 .flags          = IORESOURCE_MEM,
  45         },
  46         [1] = {
  47                 .name           = "smsc911x-irq",
  48                 .start          = evt2irq(0x2c0),
  49                 .end            = evt2irq(0x2c0),
  50                 .flags          = IORESOURCE_IRQ,
  51         },
  52 };
  53
  54 static struct smsc911x_platform_config smsc911x_config = {
  55         .irq_polarity   = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
  56         .irq_type       = SMSC911X_IRQ_TYPE_OPEN_DRAIN,
  57         .flags          = SMSC911X_USE_32BIT,
  58         .phy_interface  = PHY_INTERFACE_MODE_MII,
  59 };
  60
  61 static struct platform_device smsc911x_device = {
  62         .name           = "smsc911x",
  63         .id             = -1,
  64         .num_resources  = ARRAY_SIZE(smsc911x_resources),
  65         .resource       = smsc911x_resources,
  66         .dev = {
  67                 .platform_data = &smsc911x_config,
  68         },
  69 };
  70
  71 static struct resource smbus_fpga_resource = {
  72         .start          = 0x07fff9e0,
  73         .end            = 0x07fff9e0 + SZ_32 - 1,
  74         .flags          = IORESOURCE_MEM,
  75 };
  76
  77 static struct platform_device smbus_fpga_device = {
  78         .name           = "i2c-sdk7786",
  79         .id             = 0,
  80         .num_resources  = 1,
  81         .resource       = &smbus_fpga_resource,
  82 };
  83
  84 static struct resource smbus_pcie_resource = {
  85         .start          = 0x07fffc30,
  86         .end            = 0x07fffc30 + SZ_32 - 1,
  87         .flags          = IORESOURCE_MEM,
  88 };
  89
  90 static struct platform_device smbus_pcie_device = {
  91         .name           = "i2c-sdk7786",
  92         .id             = 1,
  93         .num_resources  = 1,
  94         .resource       = &smbus_pcie_resource,
  95 };
  96
  97 static struct i2c_board_info __initdata sdk7786_i2c_devices[] = {
  98         {
  99                 I2C_BOARD_INFO("max6900", 0x68),
 100         },
 101 };
 102
 103 static struct platform_device *sh7786_devices[] __initdata = {
 104         &heartbeat_device,
 105         &smsc911x_device,
 106         &smbus_fpga_device,
 107         &smbus_pcie_device,
 108 };
 109
 110 static int sdk7786_i2c_setup(void)
 111 {
 112         unsigned int tmp;
 113
 114         /*
 115          * Hand over I2C control to the FPGA.
 116          */
 117         tmp = fpga_read_reg(SBCR);
 118         tmp &= ~SCBR_I2CCEN;
 119         tmp |= SCBR_I2CMEN;
 120         fpga_write_reg(tmp, SBCR);
 121
 122         return i2c_register_board_info(0, sdk7786_i2c_devices,
 123                                        ARRAY_SIZE(sdk7786_i2c_devices));
 124 }
 125
 126 static int __init sdk7786_devices_setup(void)
 127 {
 128         int ret;
 129
 130         ret = platform_add_devices(sh7786_devices, ARRAY_SIZE(sh7786_devices));
 131         if (unlikely(ret != 0))
 132                 return ret;
 133
 134         return sdk7786_i2c_setup();
 135 }
 136 __initcall(sdk7786_devices_setup);
 137
 138 static int sdk7786_mode_pins(void)
 139 {
 140         return fpga_read_reg(MODSWR);
 141 }
 142
 143 static int sdk7786_clk_init(void)
 144 {
 145         struct clk *clk;
 146         int ret;
 147
 148         /*
 149          * Only handle the EXTAL case, anyone interfacing a crystal
 150          * resonator will need to provide their own input clock.
 151          */
 152         if (test_mode_pin(MODE_PIN9))
 153                 return -EINVAL;
 154
 155         clk = clk_get(NULL, "extal");
 156         if (!clk || IS_ERR(clk))
 157                 return PTR_ERR(clk);
 158         ret = clk_set_rate(clk, 33333333);
 159         clk_put(clk);
 160
 161         return ret;
 162 }
 163
 164 static void sdk7786_restart(char *cmd)
 165 {
 166         fpga_write_reg(0xa5a5, SRSTR);
 167 }
 168
 169 static void sdk7786_power_off(void)
 170 {
 171         fpga_write_reg(fpga_read_reg(PWRCR) | PWRCR_PDWNREQ, PWRCR);
 172
 173         /*
 174          * It can take up to 20us for the R8C to do its job, back off and
 175          * wait a bit until we've been shut off. Even though newer FPGA
 176          * versions don't set the ACK bit, the latency issue remains.
 177          */
 178         while ((fpga_read_reg(PWRCR) & PWRCR_PDWNACK) == 0)
 179                 cpu_sleep();
 180 }
 181
 182 /* Initialize the board */
 183 static void __init sdk7786_setup(char **cmdline_p)
 184 {
 185         pr_info("Renesas Technology Europe SDK7786 support:\n");
 186
 187         sdk7786_fpga_init();
 188
 189         pr_info("\tPCB revision:\t%d\n", fpga_read_reg(PCBRR) & 0xf);
 190
 191         machine_ops.restart = sdk7786_restart;
 192         pm_power_off = sdk7786_power_off;
 193
 194         register_smp_ops(&shx3_smp_ops);
 195 }
 196
 197 /*
 198  * The Machine Vector
 199  */
 200 static struct sh_machine_vector mv_sdk7786 __initmv = {
 201         .mv_name                = "SDK7786",
 202         .mv_setup               = sdk7786_setup,
 203         .mv_mode_pins           = sdk7786_mode_pins,
 204         .mv_clk_init            = sdk7786_clk_init,
 205         .mv_init_irq            = sdk7786_init_irq,
 206 };