From 7347a6c7af8d9b5edf587678e80c7e5bc24ec2d5 Mon Sep 17 00:00:00 2001 From: Jan Glauber Date: Fri, 19 Aug 2016 16:03:20 +0200 Subject: spi: octeon: Add ThunderX driver Add ThunderX SPI driver using the shared part from the Octeon driver. The main difference of the ThunderX driver is that it is a PCI device so probing is different. The system clock settings can be specified in device tree. Signed-off-by: Jan Glauber Signed-off-by: Mark Brown --- drivers/spi/spi-cavium-thunderx.c | 118 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 118 insertions(+) create mode 100644 drivers/spi/spi-cavium-thunderx.c (limited to 'drivers/spi/spi-cavium-thunderx.c') diff --git a/drivers/spi/spi-cavium-thunderx.c b/drivers/spi/spi-cavium-thunderx.c new file mode 100644 index 000000000000..eff2a130ef0c --- /dev/null +++ b/drivers/spi/spi-cavium-thunderx.c @@ -0,0 +1,118 @@ +/* + * Cavium ThunderX SPI driver. + * + * Copyright (C) 2016 Cavium Inc. + * Authors: Jan Glauber + */ + +#include +#include +#include + +#include "spi-cavium.h" + +#define DRV_NAME "spi-thunderx" + +#define SYS_FREQ_DEFAULT 700000000 /* 700 Mhz */ + +static int thunderx_spi_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + struct device *dev = &pdev->dev; + struct spi_master *master; + struct octeon_spi *p; + int ret; + + master = spi_alloc_master(dev, sizeof(struct octeon_spi)); + if (!master) + return -ENOMEM; + + p = spi_master_get_devdata(master); + + ret = pcim_enable_device(pdev); + if (ret) + goto error; + + ret = pci_request_regions(pdev, DRV_NAME); + if (ret) + goto error; + + p->register_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0)); + if (!p->register_base) { + ret = -EINVAL; + goto error; + } + + p->regs.config = 0x1000; + p->regs.status = 0x1008; + p->regs.tx = 0x1010; + p->regs.data = 0x1080; + + p->clk = devm_clk_get(dev, NULL); + if (IS_ERR(p->clk)) { + ret = PTR_ERR(p->clk); + goto error; + } + + ret = clk_prepare_enable(p->clk); + if (ret) + goto error; + + p->sys_freq = clk_get_rate(p->clk); + if (!p->sys_freq) + p->sys_freq = SYS_FREQ_DEFAULT; + dev_info(dev, "Set system clock to %u\n", p->sys_freq); + + master->num_chipselect = 4; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | + SPI_LSB_FIRST | SPI_3WIRE; + master->transfer_one_message = octeon_spi_transfer_one_message; + master->bits_per_word_mask = SPI_BPW_MASK(8); + master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; + master->dev.of_node = pdev->dev.of_node; + + pci_set_drvdata(pdev, master); + + ret = devm_spi_register_master(dev, master); + if (ret) + goto error; + + return 0; + +error: + spi_master_put(master); + return ret; +} + +static void thunderx_spi_remove(struct pci_dev *pdev) +{ + struct spi_master *master = pci_get_drvdata(pdev); + struct octeon_spi *p; + + p = spi_master_get_devdata(master); + if (!p) + return; + + /* Put everything in a known state. */ + writeq(0, p->register_base + OCTEON_SPI_CFG(p)); +} + +static const struct pci_device_id thunderx_spi_pci_id_table[] = { + { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa00b) }, + { 0, } +}; + +MODULE_DEVICE_TABLE(pci, thunderx_spi_pci_id_table); + +static struct pci_driver thunderx_spi_driver = { + .name = DRV_NAME, + .id_table = thunderx_spi_pci_id_table, + .probe = thunderx_spi_probe, + .remove = thunderx_spi_remove, +}; + +module_pci_driver(thunderx_spi_driver); + +MODULE_DESCRIPTION("Cavium, Inc. ThunderX SPI bus driver"); +MODULE_AUTHOR("Jan Glauber"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3