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