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