kernel/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/regulator/fixed.h>
  15 #include <linux/regulator/machine.h>
  16 #include <linux/smsc911x.h>
  17 #include <linux/i2c.h>
  18 #include <linux/irq.h>
  19 #include <linux/clk.h>
  20 #include <linux/clkdev.h>
  21 #include <mach/fpga.h>
  22 #include <mach/irq.h>
  23 #include <asm/machvec.h>
  24 #include <asm/heartbeat.h>
  25 #include <asm/sizes.h>
  26 #include <asm/clock.h>
  27 #include <asm/reboot.h>
  28 #include <asm/smp-ops.h>
  29
  30 static struct resource heartbeat_resource = {
  31         .start          = 0x07fff8b0,
  32         .end            = 0x07fff8b0 + sizeof(u16) - 1,
  33         .flags          = IORESOURCE_MEM | IORESOURCE_MEM_16BIT,
  34 };
  35
  36 static struct platform_device heartbeat_device = {
  37         .name           = "heartbeat",
  38         .id             = -1,
  39         .num_resources  = 1,
  40         .resource       = &heartbeat_resource,
  41 };
  42
  43 /* Dummy supplies, where voltage doesn't matter */
  44 static struct regulator_consumer_supply dummy_supplies[] = {
  45         REGULATOR_SUPPLY("vddvario", "smsc911x"),
  46         REGULATOR_SUPPLY("vdd33a", "smsc911x"),
  47 };
  48
  49 static struct resource smsc911x_resources[] = {
  50         [0] = {
  51                 .name           = "smsc911x-memory",
  52                 .start          = 0x07ffff00,
  53                 .end            = 0x07ffff00 + SZ_256 - 1,
  54                 .flags          = IORESOURCE_MEM,
  55         },
  56         [1] = {
  57                 .name           = "smsc911x-irq",
  58                 .start          = evt2irq(0x2c0),
  59                 .end            = evt2irq(0x2c0),
  60                 .flags          = IORESOURCE_IRQ,
  61         },
  62 };
  63
  64 static struct smsc911x_platform_config smsc911x_config = {
  65         .irq_polarity   = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
  66         .irq_type       = SMSC911X_IRQ_TYPE_OPEN_DRAIN,
  67         .flags          = SMSC911X_USE_32BIT,
  68         .phy_interface  = PHY_INTERFACE_MODE_MII,
  69 };
  70
  71 static struct platform_device smsc911x_device = {
  72         .name           = "smsc911x",
  73         .id             = -1,
  74         .num_resources  = ARRAY_SIZE(smsc911x_resources),
  75         .resource       = smsc911x_resources,
  76         .dev = {
  77                 .platform_data = &smsc911x_config,
  78         },
  79 };
  80
  81 static struct resource smbus_fpga_resource = {
  82         .start          = 0x07fff9e0,
  83         .end            = 0x07fff9e0 + SZ_32 - 1,
  84         .flags          = IORESOURCE_MEM,
  85 };
  86
  87 static struct platform_device smbus_fpga_device = {
  88         .name           = "i2c-sdk7786",
  89         .id             = 0,
  90         .num_resources  = 1,
  91         .resource       = &smbus_fpga_resource,
  92 };
  93
  94 static struct resource smbus_pcie_resource = {
  95         .start          = 0x07fffc30,
  96         .end            = 0x07fffc30 + SZ_32 - 1,
  97         .flags          = IORESOURCE_MEM,
  98 };
  99
 100 static struct platform_device smbus_pcie_device = {
 101         .name           = "i2c-sdk7786",
 102         .id             = 1,
 103         .num_resources  = 1,
 104         .resource       = &smbus_pcie_resource,
 105 };
 106
 107 static struct i2c_board_info __initdata sdk7786_i2c_devices[] = {
 108         {
 109                 I2C_BOARD_INFO("max6900", 0x68),
 110         },
 111 };
 112
 113 static struct platform_device *sh7786_devices[] __initdata = {
 114         &heartbeat_device,
 115         &smsc911x_device,
 116         &smbus_fpga_device,
 117         &smbus_pcie_device,
 118 };
 119
 120 static int sdk7786_i2c_setup(void)
 121 {
 122         unsigned int tmp;
 123
 124         /*
 125          * Hand over I2C control to the FPGA.
 126          */
 127         tmp = fpga_read_reg(SBCR);
 128         tmp &= ~SCBR_I2CCEN;
 129         tmp |= SCBR_I2CMEN;
 130         fpga_write_reg(tmp, SBCR);
 131
 132         return i2c_register_board_info(0, sdk7786_i2c_devices,
 133                                        ARRAY_SIZE(sdk7786_i2c_devices));
 134 }
 135
 136 static int __init sdk7786_devices_setup(void)
 137 {
 138         int ret;
 139
 140         ret = platform_add_devices(sh7786_devices, ARRAY_SIZE(sh7786_devices));
 141         if (unlikely(ret != 0))
 142                 return ret;
 143
 144         return sdk7786_i2c_setup();
 145 }
 146 device_initcall(sdk7786_devices_setup);
 147
 148 static int sdk7786_mode_pins(void)
 149 {
 150         return fpga_read_reg(MODSWR);
 151 }
 152
 153 /*
 154  * FPGA-driven PCIe clocks
 155  *
 156  * Historically these include the oscillator, clock B (slots 2/3/4) and
 157  * clock A (slot 1 and the CPU clock). Newer revs of the PCB shove
 158  * everything under a single PCIe clocks enable bit that happens to map
 159  * to the same bit position as the oscillator bit for earlier FPGA
 160  * versions.
 161  *
 162  * Given that the legacy clocks have the side-effect of shutting the CPU
 163  * off through the FPGA along with the PCI slots, we simply leave them in
 164  * their initial state and don't bother registering them with the clock
 165  * framework.
 166  */
 167 static int sdk7786_pcie_clk_enable(struct clk *clk)
 168 {
 169         fpga_write_reg(fpga_read_reg(PCIECR) | PCIECR_CLKEN, PCIECR);
 170         return 0;
 171 }
 172
 173 static void sdk7786_pcie_clk_disable(struct clk *clk)
 174 {
 175         fpga_write_reg(fpga_read_reg(PCIECR) & ~PCIECR_CLKEN, PCIECR);
 176 }
 177
 178 static struct sh_clk_ops sdk7786_pcie_clk_ops = {
 179         .enable         = sdk7786_pcie_clk_enable,
 180         .disable        = sdk7786_pcie_clk_disable,
 181 };
 182
 183 static struct clk sdk7786_pcie_clk = {
 184         .ops            = &sdk7786_pcie_clk_ops,
 185 };
 186
 187 static struct clk_lookup sdk7786_pcie_cl = {
 188         .con_id         = "pcie_plat_clk",
 189         .clk            = &sdk7786_pcie_clk,
 190 };
 191
 192 static int sdk7786_clk_init(void)
 193 {
 194         struct clk *clk;
 195         int ret;
 196
 197         /*
 198          * Only handle the EXTAL case, anyone interfacing a crystal
 199          * resonator will need to provide their own input clock.
 200          */
 201         if (test_mode_pin(MODE_PIN9))
 202                 return -EINVAL;
 203
 204         clk = clk_get(NULL, "extal");
 205         if (IS_ERR(clk))
 206                 return PTR_ERR(clk);
 207         ret = clk_set_rate(clk, 33333333);
 208         clk_put(clk);
 209
 210         /*
 211          * Setup the FPGA clocks.
 212          */
 213         ret = clk_register(&sdk7786_pcie_clk);
 214         if (unlikely(ret)) {
 215                 pr_err("FPGA clock registration failed\n");
 216                 return ret;
 217         }
 218
 219         clkdev_add(&sdk7786_pcie_cl);
 220
 221         return 0;
 222 }
 223
 224 static void sdk7786_restart(char *cmd)
 225 {
 226         fpga_write_reg(0xa5a5, SRSTR);
 227 }
 228
 229 static void sdk7786_power_off(void)
 230 {
 231         fpga_write_reg(fpga_read_reg(PWRCR) | PWRCR_PDWNREQ, PWRCR);
 232
 233         /*
 234          * It can take up to 20us for the R8C to do its job, back off and
 235          * wait a bit until we've been shut off. Even though newer FPGA
 236          * versions don't set the ACK bit, the latency issue remains.
 237          */
 238         while ((fpga_read_reg(PWRCR) & PWRCR_PDWNACK) == 0)
 239                 cpu_sleep();
 240 }
 241
 242 /* Initialize the board */
 243 static void __init sdk7786_setup(char **cmdline_p)
 244 {
 245         pr_info("Renesas Technology Europe SDK7786 support:\n");
 246
 247         regulator_register_fixed(0, dummy_supplies, ARRAY_SIZE(dummy_supplies));
 248
 249         sdk7786_fpga_init();
 250         sdk7786_nmi_init();
 251
 252         pr_info("\tPCB revision:\t%d\n", fpga_read_reg(PCBRR) & 0xf);
 253
 254         machine_ops.restart = sdk7786_restart;
 255         pm_power_off = sdk7786_power_off;
 256
 257         register_smp_ops(&shx3_smp_ops);
 258 }
 259
 260 /*
 261  * The Machine Vector
 262  */
 263 static struct sh_machine_vector mv_sdk7786 __initmv = {
 264         .mv_name                = "SDK7786",
 265         .mv_setup               = sdk7786_setup,
 266         .mv_mode_pins           = sdk7786_mode_pins,
 267         .mv_clk_init            = sdk7786_clk_init,
 268         .mv_init_irq            = sdk7786_init_irq,
 269 };