// SPDX-License-Identifier: GPL-2.0
/*
* Renesas Technology Europe SDK7786 Support.
*
* Copyright (C) 2010 Matt Fleming
* Copyright (C) 2010 Paul Mundt
*/
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/regulator/fixed.h>
#include <linux/regulator/machine.h>
#include <linux/smsc911x.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <mach/fpga.h>
#include <mach/irq.h>
#include <asm/machvec.h>
#include <asm/heartbeat.h>
#include <linux/sizes.h>
#include <asm/clock.h>
#include <asm/reboot.h>
#include <asm/smp-ops.h>
static struct resource heartbeat_resource = {
.start = 0x07fff8b0,
.end = 0x07fff8b0 + sizeof(u16) - 1,
.flags = IORESOURCE_MEM | IORESOURCE_MEM_16BIT,
};
static struct platform_device heartbeat_device = {
.name = "heartbeat",
.id = -1,
.num_resources = 1,
.resource = &heartbeat_resource,
};
/* Dummy supplies, where voltage doesn't matter */
static struct regulator_consumer_supply dummy_supplies[] = {
REGULATOR_SUPPLY("vddvario", "smsc911x"),
REGULATOR_SUPPLY("vdd33a", "smsc911x"),
};
static struct resource smsc911x_resources[] = {
[0] = {
.name = "smsc911x-memory",
.start = 0x07ffff00,
.end = 0x07ffff00 + SZ_256 - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.name = "smsc911x-irq",
.start = evt2irq(0x2c0),
.end = evt2irq(0x2c0),
.flags = IORESOURCE_IRQ,
},
};
static struct smsc911x_platform_config smsc911x_config = {
.irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
.irq_type = SMSC911X_IRQ_TYPE_OPEN_DRAIN,
.flags = SMSC911X_USE_32BIT,
.phy_interface = PHY_INTERFACE_MODE_MII,
};
static struct platform_device smsc911x_device = {
.name = "smsc911x",
.id = -1,
.num_resources = ARRAY_SIZE(smsc911x_resources),
.resource = smsc911x_resources,
.dev = {
.platform_data = &smsc911x_config,
},
};
static struct resource smbus_fpga_resource = {
.start = 0x07fff9e0,
.end = 0x07fff9e0 + SZ_32 - 1,
.flags = IORESOURCE_MEM,
};
static struct platform_device smbus_fpga_device = {
.name = "i2c-sdk7786",
.id = 0,
.num_resources = 1,
.resource = &smbus_fpga_resource,
};
static struct resource smbus_pcie_resource = {
.start = 0x07fffc30,
.end = 0x07fffc30 + SZ_32 - 1,
.flags = IORESOURCE_MEM,
};
static struct platform_device smbus_pcie_device = {
.name = "i2c-sdk7786",
.id = 1,
.num_resources = 1,
.resource = &smbus_pcie_resource,
};
static struct i2c_board_info __initdata sdk7786_i2c_devices[] = {
{
I2C_BOARD_INFO("max6900", 0x68),
},
};
static struct platform_device *sh7786_devices[] __initdata = {
&heartbeat_device,
&smsc911x_device,
&smbus_fpga_device,
&smbus_pcie_device,
};
static int sdk7786_i2c_setup(void)
{
unsigned int tmp;
/*
* Hand over I2C control to the FPGA.
*/
tmp = fpga_read_reg(SBCR);
tmp &= ~SCBR_I2CCEN;
tmp |= SCBR_I2CMEN;
fpga_write_reg(tmp, SBCR);
return i2c_register_board_info(0, sdk7786_i2c_devices,
ARRAY_SIZE(sdk7786_i2c_devices));
}
static int __init sdk7786_devices_setup(void)
{
int ret;
ret = platform_add_devices(sh7786_devices, ARRAY_SIZE(sh7786_devices));
if (unlikely(ret != 0))
return ret;
return sdk7786_i2c_setup();
}
device_initcall(sdk7786_devices_setup);
static int sdk7786_mode_pins(void)
{
return fpga_read_reg(MODSWR);
}
/*
* FPGA-driven PCIe clocks
*
* Historically these include the oscillator, clock B (slots 2/3/4) and
* clock A (slot 1 and the CPU clock). Newer revs of the PCB shove
* everything under a single PCIe clocks enable bit that happens to map
* to the same bit position as the oscillator bit for earlier FPGA
* versions.
*
* Given that the legacy clocks have the side-effect of shutting the CPU
* off through the FPGA along with the PCI slots, we simply leave them in
* their initial state and don't bother registering them with the clock
* framework.
*/
static int sdk7786_pcie_clk_enable(struct clk *clk)
{
fpga_write_reg(fpga_read_reg(PCIECR) | PCIECR_CLKEN, PCIECR);
return 0;
}
static void sdk7786_pcie_clk_disable(struct clk *clk)
{
fpga_write_reg(fpga_read_reg(PCIECR) & ~PCIECR_CLKEN, PCIECR);
}
static struct sh_clk_ops sdk7786_pcie_clk_ops = {
.enable = sdk7786_pcie_clk_enable,
.disable = sdk7786_pcie_clk_disable,
};
static struct clk sdk7786_pcie_clk = {
.ops = &sdk7786_pcie_clk_ops,
};
static struct clk_lookup sdk7786_pcie_cl = {
.con_id = "pcie_plat_clk",
.clk = &sdk7786_pcie_clk,
};
static int sdk7786_clk_init(void)
{
struct clk *clk;
int ret;
/*
* Only handle the EXTAL case, anyone interfacing a crystal
* resonator will need to provide their own input clock.
*/
if (test_mode_pin(MODE_PIN9))
return -EINVAL;
clk = clk_get(NULL, "extal");
if (IS_ERR(clk))
return PTR_ERR(clk);
ret = clk_set_rate(clk, 33333333);
clk_put(clk);
/*
* Setup the FPGA clocks.
*/
ret = clk_register(&sdk7786_pcie_clk);
if (unlikely(ret)) {
pr_err("FPGA clock registration failed\n");
return ret;
}
clkdev_add(&sdk7786_pcie_cl);
return 0;
}
static void sdk7786_restart(char *cmd)
{
fpga_write_reg(0xa5a5, SRSTR);
}
static void sdk7786_power_off(void)
{
fpga_write_reg(fpga_read_reg(PWRCR) | PWRCR_PDWNREQ, PWRCR);
/*
* It can take up to 20us for the R8C to do its job, back off and
* wait a bit until we've been shut off. Even though newer FPGA
* versions don't set the ACK bit, the latency issue remains.
*/
while ((fpga_read_reg(PWRCR) & PWRCR_PDWNACK) == 0)
cpu_sleep();
}
/* Initialize the board */
static void __init sdk7786_setup(char **cmdline_p)
{
pr_info("Renesas Technology Europe SDK7786 support:\n");
regulator_register_fixed(0, dummy_supplies, ARRAY_SIZE(dummy_supplies));
sdk7786_fpga_init();
sdk7786_nmi_init();
pr_info("\tPCB revision:\t%d\n", fpga_read_reg(PCBRR) & 0xf);
machine_ops.restart = sdk7786_restart;
pm_power_off = sdk7786_power_off;
register_smp_ops(&shx3_smp_ops);
}
/*
* The Machine Vector
*/
static struct sh_machine_vector mv_sdk7786 __initmv = {
.mv_name = "SDK7786",
.mv_setup = sdk7786_setup,
.mv_mode_pins = sdk7786_mode_pins,
.mv_clk_init = sdk7786_clk_init,
.mv_init_irq = sdk7786_init_irq,
};