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![Eddie James](/assets/img/avatar_default.png)
Since we have two scom drivers, use the standard of matching if the driver specifies a table so that the right devices go to the right driver. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20230612195657.245125-4-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
628 lines
14 KiB
C
628 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* SCOM FSI Client device driver
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*
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* Copyright (C) IBM Corporation 2016
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*/
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#include <linux/fsi.h>
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#include <linux/module.h>
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#include <linux/cdev.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/mod_devicetable.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <uapi/linux/fsi.h>
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#define FSI_ENGID_SCOM 0x5
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/* SCOM engine register set */
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#define SCOM_DATA0_REG 0x00
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#define SCOM_DATA1_REG 0x04
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#define SCOM_CMD_REG 0x08
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#define SCOM_FSI2PIB_RESET_REG 0x18
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#define SCOM_STATUS_REG 0x1C /* Read */
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#define SCOM_PIB_RESET_REG 0x1C /* Write */
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/* Command register */
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#define SCOM_WRITE_CMD 0x80000000
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#define SCOM_READ_CMD 0x00000000
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/* Status register bits */
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#define SCOM_STATUS_ERR_SUMMARY 0x80000000
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#define SCOM_STATUS_PROTECTION 0x01000000
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#define SCOM_STATUS_PARITY 0x04000000
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#define SCOM_STATUS_PIB_ABORT 0x00100000
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#define SCOM_STATUS_PIB_RESP_MASK 0x00007000
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#define SCOM_STATUS_PIB_RESP_SHIFT 12
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#define SCOM_STATUS_FSI2PIB_ERROR (SCOM_STATUS_PROTECTION | \
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SCOM_STATUS_PARITY | \
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SCOM_STATUS_PIB_ABORT)
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#define SCOM_STATUS_ANY_ERR (SCOM_STATUS_FSI2PIB_ERROR | \
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SCOM_STATUS_PIB_RESP_MASK)
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/* SCOM address encodings */
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#define XSCOM_ADDR_IND_FLAG BIT_ULL(63)
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#define XSCOM_ADDR_INF_FORM1 BIT_ULL(60)
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/* SCOM indirect stuff */
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#define XSCOM_ADDR_DIRECT_PART 0x7fffffffull
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#define XSCOM_ADDR_INDIRECT_PART 0x000fffff00000000ull
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#define XSCOM_DATA_IND_READ BIT_ULL(63)
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#define XSCOM_DATA_IND_COMPLETE BIT_ULL(31)
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#define XSCOM_DATA_IND_ERR_MASK 0x70000000ull
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#define XSCOM_DATA_IND_ERR_SHIFT 28
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#define XSCOM_DATA_IND_DATA 0x0000ffffull
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#define XSCOM_DATA_IND_FORM1_DATA 0x000fffffffffffffull
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#define XSCOM_ADDR_FORM1_LOW 0x000ffffffffull
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#define XSCOM_ADDR_FORM1_HI 0xfff00000000ull
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#define XSCOM_ADDR_FORM1_HI_SHIFT 20
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/* Retries */
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#define SCOM_MAX_IND_RETRIES 10 /* Retries indirect not ready */
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struct scom_device {
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struct list_head link;
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struct fsi_device *fsi_dev;
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struct device dev;
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struct cdev cdev;
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struct mutex lock;
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bool dead;
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};
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static int __put_scom(struct scom_device *scom_dev, uint64_t value,
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uint32_t addr, uint32_t *status)
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{
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__be32 data, raw_status;
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int rc;
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data = cpu_to_be32((value >> 32) & 0xffffffff);
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rc = fsi_device_write(scom_dev->fsi_dev, SCOM_DATA0_REG, &data,
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sizeof(uint32_t));
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if (rc)
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return rc;
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data = cpu_to_be32(value & 0xffffffff);
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rc = fsi_device_write(scom_dev->fsi_dev, SCOM_DATA1_REG, &data,
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sizeof(uint32_t));
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if (rc)
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return rc;
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data = cpu_to_be32(SCOM_WRITE_CMD | addr);
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rc = fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data,
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sizeof(uint32_t));
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if (rc)
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return rc;
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rc = fsi_device_read(scom_dev->fsi_dev, SCOM_STATUS_REG, &raw_status,
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sizeof(uint32_t));
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if (rc)
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return rc;
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*status = be32_to_cpu(raw_status);
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return 0;
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}
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static int __get_scom(struct scom_device *scom_dev, uint64_t *value,
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uint32_t addr, uint32_t *status)
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{
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__be32 data, raw_status;
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int rc;
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*value = 0ULL;
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data = cpu_to_be32(SCOM_READ_CMD | addr);
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rc = fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data,
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sizeof(uint32_t));
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if (rc)
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return rc;
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rc = fsi_device_read(scom_dev->fsi_dev, SCOM_STATUS_REG, &raw_status,
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sizeof(uint32_t));
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if (rc)
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return rc;
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/*
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* Read the data registers even on error, so we don't have
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* to interpret the status register here.
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*/
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rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA0_REG, &data,
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sizeof(uint32_t));
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if (rc)
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return rc;
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*value |= (uint64_t)be32_to_cpu(data) << 32;
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rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA1_REG, &data,
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sizeof(uint32_t));
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if (rc)
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return rc;
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*value |= be32_to_cpu(data);
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*status = be32_to_cpu(raw_status);
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return rc;
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}
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static int put_indirect_scom_form0(struct scom_device *scom, uint64_t value,
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uint64_t addr, uint32_t *status)
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{
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uint64_t ind_data, ind_addr;
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int rc, err;
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if (value & ~XSCOM_DATA_IND_DATA)
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return -EINVAL;
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ind_addr = addr & XSCOM_ADDR_DIRECT_PART;
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ind_data = (addr & XSCOM_ADDR_INDIRECT_PART) | value;
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rc = __put_scom(scom, ind_data, ind_addr, status);
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if (rc || (*status & SCOM_STATUS_ANY_ERR))
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return rc;
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rc = __get_scom(scom, &ind_data, addr, status);
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if (rc || (*status & SCOM_STATUS_ANY_ERR))
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return rc;
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err = (ind_data & XSCOM_DATA_IND_ERR_MASK) >> XSCOM_DATA_IND_ERR_SHIFT;
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*status = err << SCOM_STATUS_PIB_RESP_SHIFT;
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return 0;
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}
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static int put_indirect_scom_form1(struct scom_device *scom, uint64_t value,
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uint64_t addr, uint32_t *status)
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{
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uint64_t ind_data, ind_addr;
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if (value & ~XSCOM_DATA_IND_FORM1_DATA)
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return -EINVAL;
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ind_addr = addr & XSCOM_ADDR_FORM1_LOW;
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ind_data = value | (addr & XSCOM_ADDR_FORM1_HI) << XSCOM_ADDR_FORM1_HI_SHIFT;
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return __put_scom(scom, ind_data, ind_addr, status);
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}
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static int get_indirect_scom_form0(struct scom_device *scom, uint64_t *value,
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uint64_t addr, uint32_t *status)
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{
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uint64_t ind_data, ind_addr;
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int rc, err;
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ind_addr = addr & XSCOM_ADDR_DIRECT_PART;
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ind_data = (addr & XSCOM_ADDR_INDIRECT_PART) | XSCOM_DATA_IND_READ;
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rc = __put_scom(scom, ind_data, ind_addr, status);
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if (rc || (*status & SCOM_STATUS_ANY_ERR))
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return rc;
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rc = __get_scom(scom, &ind_data, addr, status);
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if (rc || (*status & SCOM_STATUS_ANY_ERR))
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return rc;
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err = (ind_data & XSCOM_DATA_IND_ERR_MASK) >> XSCOM_DATA_IND_ERR_SHIFT;
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*status = err << SCOM_STATUS_PIB_RESP_SHIFT;
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*value = ind_data & XSCOM_DATA_IND_DATA;
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return 0;
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}
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static int raw_put_scom(struct scom_device *scom, uint64_t value,
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uint64_t addr, uint32_t *status)
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{
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if (addr & XSCOM_ADDR_IND_FLAG) {
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if (addr & XSCOM_ADDR_INF_FORM1)
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return put_indirect_scom_form1(scom, value, addr, status);
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else
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return put_indirect_scom_form0(scom, value, addr, status);
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} else
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return __put_scom(scom, value, addr, status);
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}
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static int raw_get_scom(struct scom_device *scom, uint64_t *value,
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uint64_t addr, uint32_t *status)
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{
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if (addr & XSCOM_ADDR_IND_FLAG) {
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if (addr & XSCOM_ADDR_INF_FORM1)
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return -ENXIO;
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return get_indirect_scom_form0(scom, value, addr, status);
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} else
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return __get_scom(scom, value, addr, status);
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}
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static int handle_fsi2pib_status(struct scom_device *scom, uint32_t status)
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{
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uint32_t dummy = -1;
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if (status & SCOM_STATUS_FSI2PIB_ERROR)
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fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG, &dummy,
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sizeof(uint32_t));
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if (status & SCOM_STATUS_PROTECTION)
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return -EPERM;
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if (status & SCOM_STATUS_PARITY)
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return -EIO;
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if (status & SCOM_STATUS_PIB_ABORT)
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return -EBUSY;
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return 0;
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}
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static int handle_pib_status(struct scom_device *scom, uint8_t status)
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{
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uint32_t dummy = -1;
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if (status == SCOM_PIB_SUCCESS)
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return 0;
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if (status == SCOM_PIB_BLOCKED)
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return -EBUSY;
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/* Reset the bridge */
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fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG, &dummy,
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sizeof(uint32_t));
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switch(status) {
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case SCOM_PIB_OFFLINE:
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return -ENODEV;
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case SCOM_PIB_BAD_ADDR:
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return -ENXIO;
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case SCOM_PIB_TIMEOUT:
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return -ETIMEDOUT;
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case SCOM_PIB_PARTIAL:
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case SCOM_PIB_CLK_ERR:
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case SCOM_PIB_PARITY_ERR:
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default:
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return -EIO;
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}
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}
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static int put_scom(struct scom_device *scom, uint64_t value,
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uint64_t addr)
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{
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uint32_t status;
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int rc;
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rc = raw_put_scom(scom, value, addr, &status);
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if (rc)
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return rc;
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rc = handle_fsi2pib_status(scom, status);
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if (rc)
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return rc;
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return handle_pib_status(scom,
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(status & SCOM_STATUS_PIB_RESP_MASK)
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>> SCOM_STATUS_PIB_RESP_SHIFT);
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}
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static int get_scom(struct scom_device *scom, uint64_t *value,
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uint64_t addr)
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{
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uint32_t status;
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int rc;
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rc = raw_get_scom(scom, value, addr, &status);
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if (rc)
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return rc;
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rc = handle_fsi2pib_status(scom, status);
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if (rc)
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return rc;
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return handle_pib_status(scom,
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(status & SCOM_STATUS_PIB_RESP_MASK)
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>> SCOM_STATUS_PIB_RESP_SHIFT);
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}
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static ssize_t scom_read(struct file *filep, char __user *buf, size_t len,
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loff_t *offset)
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{
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struct scom_device *scom = filep->private_data;
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struct device *dev = &scom->fsi_dev->dev;
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uint64_t val;
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int rc;
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if (len != sizeof(uint64_t))
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return -EINVAL;
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mutex_lock(&scom->lock);
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if (scom->dead)
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rc = -ENODEV;
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else
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rc = get_scom(scom, &val, *offset);
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mutex_unlock(&scom->lock);
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if (rc) {
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dev_dbg(dev, "get_scom fail:%d\n", rc);
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return rc;
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}
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rc = copy_to_user(buf, &val, len);
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if (rc)
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dev_dbg(dev, "copy to user failed:%d\n", rc);
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return rc ? rc : len;
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}
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static ssize_t scom_write(struct file *filep, const char __user *buf,
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size_t len, loff_t *offset)
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{
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int rc;
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struct scom_device *scom = filep->private_data;
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struct device *dev = &scom->fsi_dev->dev;
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uint64_t val;
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if (len != sizeof(uint64_t))
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return -EINVAL;
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rc = copy_from_user(&val, buf, len);
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if (rc) {
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dev_dbg(dev, "copy from user failed:%d\n", rc);
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return -EINVAL;
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}
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mutex_lock(&scom->lock);
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if (scom->dead)
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rc = -ENODEV;
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else
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rc = put_scom(scom, val, *offset);
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mutex_unlock(&scom->lock);
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if (rc) {
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dev_dbg(dev, "put_scom failed with:%d\n", rc);
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return rc;
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}
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return len;
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}
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static loff_t scom_llseek(struct file *file, loff_t offset, int whence)
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{
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switch (whence) {
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case SEEK_CUR:
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break;
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case SEEK_SET:
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file->f_pos = offset;
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break;
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default:
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return -EINVAL;
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}
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return offset;
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}
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static void raw_convert_status(struct scom_access *acc, uint32_t status)
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{
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acc->pib_status = (status & SCOM_STATUS_PIB_RESP_MASK) >>
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SCOM_STATUS_PIB_RESP_SHIFT;
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acc->intf_errors = 0;
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if (status & SCOM_STATUS_PROTECTION)
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acc->intf_errors |= SCOM_INTF_ERR_PROTECTION;
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else if (status & SCOM_STATUS_PARITY)
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acc->intf_errors |= SCOM_INTF_ERR_PARITY;
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else if (status & SCOM_STATUS_PIB_ABORT)
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acc->intf_errors |= SCOM_INTF_ERR_ABORT;
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else if (status & SCOM_STATUS_ERR_SUMMARY)
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acc->intf_errors |= SCOM_INTF_ERR_UNKNOWN;
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}
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static int scom_raw_read(struct scom_device *scom, void __user *argp)
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{
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struct scom_access acc;
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uint32_t status;
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int rc;
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if (copy_from_user(&acc, argp, sizeof(struct scom_access)))
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return -EFAULT;
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rc = raw_get_scom(scom, &acc.data, acc.addr, &status);
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if (rc)
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return rc;
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raw_convert_status(&acc, status);
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if (copy_to_user(argp, &acc, sizeof(struct scom_access)))
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return -EFAULT;
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return 0;
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}
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static int scom_raw_write(struct scom_device *scom, void __user *argp)
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{
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u64 prev_data, mask, data;
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struct scom_access acc;
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uint32_t status;
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int rc;
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if (copy_from_user(&acc, argp, sizeof(struct scom_access)))
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return -EFAULT;
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if (acc.mask) {
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rc = raw_get_scom(scom, &prev_data, acc.addr, &status);
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if (rc)
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return rc;
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if (status & SCOM_STATUS_ANY_ERR)
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goto fail;
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mask = acc.mask;
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} else {
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prev_data = mask = -1ull;
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}
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data = (prev_data & ~mask) | (acc.data & mask);
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rc = raw_put_scom(scom, data, acc.addr, &status);
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if (rc)
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return rc;
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fail:
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raw_convert_status(&acc, status);
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if (copy_to_user(argp, &acc, sizeof(struct scom_access)))
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return -EFAULT;
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return 0;
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}
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static int scom_reset(struct scom_device *scom, void __user *argp)
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{
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uint32_t flags, dummy = -1;
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int rc = 0;
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if (get_user(flags, (__u32 __user *)argp))
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return -EFAULT;
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if (flags & SCOM_RESET_PIB)
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rc = fsi_device_write(scom->fsi_dev, SCOM_PIB_RESET_REG, &dummy,
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sizeof(uint32_t));
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if (!rc && (flags & (SCOM_RESET_PIB | SCOM_RESET_INTF)))
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rc = fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG, &dummy,
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sizeof(uint32_t));
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return rc;
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}
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static int scom_check(struct scom_device *scom, void __user *argp)
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{
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/* Still need to find out how to get "protected" */
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return put_user(SCOM_CHECK_SUPPORTED, (__u32 __user *)argp);
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}
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static long scom_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct scom_device *scom = file->private_data;
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void __user *argp = (void __user *)arg;
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int rc = -ENOTTY;
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mutex_lock(&scom->lock);
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if (scom->dead) {
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mutex_unlock(&scom->lock);
|
|
return -ENODEV;
|
|
}
|
|
switch(cmd) {
|
|
case FSI_SCOM_CHECK:
|
|
rc = scom_check(scom, argp);
|
|
break;
|
|
case FSI_SCOM_READ:
|
|
rc = scom_raw_read(scom, argp);
|
|
break;
|
|
case FSI_SCOM_WRITE:
|
|
rc = scom_raw_write(scom, argp);
|
|
break;
|
|
case FSI_SCOM_RESET:
|
|
rc = scom_reset(scom, argp);
|
|
break;
|
|
}
|
|
mutex_unlock(&scom->lock);
|
|
return rc;
|
|
}
|
|
|
|
static int scom_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct scom_device *scom = container_of(inode->i_cdev, struct scom_device, cdev);
|
|
|
|
file->private_data = scom;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations scom_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = scom_open,
|
|
.llseek = scom_llseek,
|
|
.read = scom_read,
|
|
.write = scom_write,
|
|
.unlocked_ioctl = scom_ioctl,
|
|
};
|
|
|
|
static void scom_free(struct device *dev)
|
|
{
|
|
struct scom_device *scom = container_of(dev, struct scom_device, dev);
|
|
|
|
put_device(&scom->fsi_dev->dev);
|
|
kfree(scom);
|
|
}
|
|
|
|
static int scom_probe(struct device *dev)
|
|
{
|
|
struct fsi_device *fsi_dev = to_fsi_dev(dev);
|
|
struct scom_device *scom;
|
|
int rc, didx;
|
|
|
|
scom = kzalloc(sizeof(*scom), GFP_KERNEL);
|
|
if (!scom)
|
|
return -ENOMEM;
|
|
dev_set_drvdata(dev, scom);
|
|
mutex_init(&scom->lock);
|
|
|
|
/* Grab a reference to the device (parent of our cdev), we'll drop it later */
|
|
if (!get_device(dev)) {
|
|
kfree(scom);
|
|
return -ENODEV;
|
|
}
|
|
scom->fsi_dev = fsi_dev;
|
|
|
|
/* Create chardev for userspace access */
|
|
scom->dev.type = &fsi_cdev_type;
|
|
scom->dev.parent = dev;
|
|
scom->dev.release = scom_free;
|
|
device_initialize(&scom->dev);
|
|
|
|
/* Allocate a minor in the FSI space */
|
|
rc = fsi_get_new_minor(fsi_dev, fsi_dev_scom, &scom->dev.devt, &didx);
|
|
if (rc)
|
|
goto err;
|
|
|
|
dev_set_name(&scom->dev, "scom%d", didx);
|
|
cdev_init(&scom->cdev, &scom_fops);
|
|
rc = cdev_device_add(&scom->cdev, &scom->dev);
|
|
if (rc) {
|
|
dev_err(dev, "Error %d creating char device %s\n",
|
|
rc, dev_name(&scom->dev));
|
|
goto err_free_minor;
|
|
}
|
|
|
|
return 0;
|
|
err_free_minor:
|
|
fsi_free_minor(scom->dev.devt);
|
|
err:
|
|
put_device(&scom->dev);
|
|
return rc;
|
|
}
|
|
|
|
static int scom_remove(struct device *dev)
|
|
{
|
|
struct scom_device *scom = dev_get_drvdata(dev);
|
|
|
|
mutex_lock(&scom->lock);
|
|
scom->dead = true;
|
|
mutex_unlock(&scom->lock);
|
|
cdev_device_del(&scom->cdev, &scom->dev);
|
|
fsi_free_minor(scom->dev.devt);
|
|
put_device(&scom->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id scom_of_ids[] = {
|
|
{ .compatible = "ibm,fsi2pib" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, scom_of_ids);
|
|
|
|
static const struct fsi_device_id scom_ids[] = {
|
|
{
|
|
.engine_type = FSI_ENGID_SCOM,
|
|
.version = FSI_VERSION_ANY,
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
static struct fsi_driver scom_drv = {
|
|
.id_table = scom_ids,
|
|
.drv = {
|
|
.name = "scom",
|
|
.bus = &fsi_bus_type,
|
|
.of_match_table = scom_of_ids,
|
|
.probe = scom_probe,
|
|
.remove = scom_remove,
|
|
}
|
|
};
|
|
|
|
static int scom_init(void)
|
|
{
|
|
return fsi_driver_register(&scom_drv);
|
|
}
|
|
|
|
static void scom_exit(void)
|
|
{
|
|
fsi_driver_unregister(&scom_drv);
|
|
}
|
|
|
|
module_init(scom_init);
|
|
module_exit(scom_exit);
|
|
MODULE_LICENSE("GPL");
|