The ThunderX SOC uses the same i2c block as the Octeon SOC. The main difference is that on ThunderX the device is a PCI device so device probing is done via PCI, interrupts are MSI-X. The clock rates can be set via device tree or ACPI. Signed-off-by: Jan Glauber <jglauber@cavium.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>tirimbino
Jan Glauber
9 years ago
committed by
Wolfram Sang
parent
ad83665b46
commit
22d40209de
@ -0,0 +1,209 @@ |
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/*
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* Cavium ThunderX i2c driver. |
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* |
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* Copyright (C) 2015,2016 Cavium Inc. |
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* Authors: Fred Martin <fmartin@caviumnetworks.com> |
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* Jan Glauber <jglauber@cavium.com> |
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* |
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* This file is licensed under the terms of the GNU General Public |
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* License version 2. This program is licensed "as is" without any |
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* warranty of any kind, whether express or implied. |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/i2c.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include "i2c-octeon-core.h" |
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#define DRV_NAME "i2c-thunderx" |
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#define PCI_DEVICE_ID_THUNDER_TWSI 0xa012 |
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#define SYS_FREQ_DEFAULT 700000000 |
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#define TWSI_INT_ENA_W1C 0x1028 |
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#define TWSI_INT_ENA_W1S 0x1030 |
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/*
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* Enable the CORE interrupt. |
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* The interrupt will be asserted when there is non-STAT_IDLE state in the |
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* SW_TWSI_EOP_TWSI_STAT register. |
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*/ |
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static void thunder_i2c_int_enable(struct octeon_i2c *i2c) |
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{ |
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octeon_i2c_writeq_flush(TWSI_INT_CORE_INT, |
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i2c->twsi_base + TWSI_INT_ENA_W1S); |
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} |
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/*
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* Disable the CORE interrupt. |
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*/ |
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static void thunder_i2c_int_disable(struct octeon_i2c *i2c) |
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{ |
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octeon_i2c_writeq_flush(TWSI_INT_CORE_INT, |
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i2c->twsi_base + TWSI_INT_ENA_W1C); |
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} |
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static void thunder_i2c_hlc_int_enable(struct octeon_i2c *i2c) |
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{ |
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octeon_i2c_writeq_flush(TWSI_INT_ST_INT | TWSI_INT_TS_INT, |
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i2c->twsi_base + TWSI_INT_ENA_W1S); |
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} |
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static void thunder_i2c_hlc_int_disable(struct octeon_i2c *i2c) |
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{ |
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octeon_i2c_writeq_flush(TWSI_INT_ST_INT | TWSI_INT_TS_INT, |
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i2c->twsi_base + TWSI_INT_ENA_W1C); |
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} |
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static u32 thunderx_i2c_functionality(struct i2c_adapter *adap) |
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{ |
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return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | |
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I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_SMBUS_BLOCK_PROC_CALL; |
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} |
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static const struct i2c_algorithm thunderx_i2c_algo = { |
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.master_xfer = octeon_i2c_xfer, |
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.functionality = thunderx_i2c_functionality, |
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}; |
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static struct i2c_adapter thunderx_i2c_ops = { |
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.owner = THIS_MODULE, |
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.name = "ThunderX adapter", |
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.algo = &thunderx_i2c_algo, |
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}; |
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static void thunder_i2c_clock_enable(struct device *dev, struct octeon_i2c *i2c) |
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{ |
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int ret; |
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i2c->clk = clk_get(dev, NULL); |
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if (IS_ERR(i2c->clk)) { |
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i2c->clk = NULL; |
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goto skip; |
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} |
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ret = clk_prepare_enable(i2c->clk); |
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if (ret) |
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goto skip; |
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i2c->sys_freq = clk_get_rate(i2c->clk); |
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skip: |
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if (!i2c->sys_freq) |
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i2c->sys_freq = SYS_FREQ_DEFAULT; |
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} |
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static void thunder_i2c_clock_disable(struct device *dev, struct clk *clk) |
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{ |
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if (!clk) |
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return; |
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clk_disable_unprepare(clk); |
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clk_put(clk); |
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} |
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static int thunder_i2c_probe_pci(struct pci_dev *pdev, |
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const struct pci_device_id *ent) |
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{ |
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struct device *dev = &pdev->dev; |
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struct octeon_i2c *i2c; |
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int ret; |
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i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL); |
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if (!i2c) |
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return -ENOMEM; |
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i2c->dev = dev; |
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pci_set_drvdata(pdev, i2c); |
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ret = pcim_enable_device(pdev); |
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if (ret) |
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return ret; |
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ret = pci_request_regions(pdev, DRV_NAME); |
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if (ret) |
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return ret; |
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i2c->twsi_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0)); |
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if (!i2c->twsi_base) |
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return -EINVAL; |
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thunder_i2c_clock_enable(dev, i2c); |
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ret = device_property_read_u32(dev, "clock-frequency", &i2c->twsi_freq); |
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if (ret) |
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i2c->twsi_freq = 100000; |
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init_waitqueue_head(&i2c->queue); |
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i2c->int_enable = thunder_i2c_int_enable; |
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i2c->int_disable = thunder_i2c_int_disable; |
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i2c->hlc_int_enable = thunder_i2c_hlc_int_enable; |
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i2c->hlc_int_disable = thunder_i2c_hlc_int_disable; |
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ret = pci_enable_msix(pdev, &i2c->i2c_msix, 1); |
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if (ret) |
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goto error; |
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ret = devm_request_irq(dev, i2c->i2c_msix.vector, octeon_i2c_isr, 0, |
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DRV_NAME, i2c); |
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if (ret) |
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goto error; |
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ret = octeon_i2c_init_lowlevel(i2c); |
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if (ret) |
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goto error; |
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octeon_i2c_set_clock(i2c); |
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i2c->adap = thunderx_i2c_ops; |
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i2c->adap.retries = 5; |
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i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info; |
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i2c->adap.dev.parent = dev; |
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i2c->adap.dev.of_node = pdev->dev.of_node; |
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snprintf(i2c->adap.name, sizeof(i2c->adap.name), |
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"Cavium ThunderX i2c adapter at %s", dev_name(dev)); |
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i2c_set_adapdata(&i2c->adap, i2c); |
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ret = i2c_add_adapter(&i2c->adap); |
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if (ret) |
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goto error; |
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dev_info(i2c->dev, "Probed. Set system clock to %u\n", i2c->sys_freq); |
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return 0; |
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error: |
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thunder_i2c_clock_disable(dev, i2c->clk); |
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return ret; |
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} |
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static void thunder_i2c_remove_pci(struct pci_dev *pdev) |
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{ |
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struct octeon_i2c *i2c = pci_get_drvdata(pdev); |
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thunder_i2c_clock_disable(&pdev->dev, i2c->clk); |
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i2c_del_adapter(&i2c->adap); |
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} |
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static const struct pci_device_id thunder_i2c_pci_id_table[] = { |
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{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVICE_ID_THUNDER_TWSI) }, |
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{ 0, } |
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}; |
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MODULE_DEVICE_TABLE(pci, thunder_i2c_pci_id_table); |
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static struct pci_driver thunder_i2c_pci_driver = { |
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.name = DRV_NAME, |
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.id_table = thunder_i2c_pci_id_table, |
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.probe = thunder_i2c_probe_pci, |
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.remove = thunder_i2c_remove_pci, |
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}; |
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module_pci_driver(thunder_i2c_pci_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Fred Martin <fmartin@caviumnetworks.com>"); |
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MODULE_DESCRIPTION("I2C-Bus adapter for Cavium ThunderX SOC"); |
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