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

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  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 };
270 

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