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Diffstat (limited to 'drivers/spi/spi-bcm53xx.c')
-rw-r--r--drivers/spi/spi-bcm53xx.c360
1 files changed, 0 insertions, 360 deletions
diff --git a/drivers/spi/spi-bcm53xx.c b/drivers/spi/spi-bcm53xx.c
deleted file mode 100644
index d02ceb7a29d1..000000000000
--- a/drivers/spi/spi-bcm53xx.c
+++ /dev/null
@@ -1,360 +0,0 @@
-/*
- * Copyright (C) 2014-2016 Rafał Miłecki <rafal@milecki.pl>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/bcma/bcma.h>
-#include <linux/spi/spi.h>
-
-#include "spi-bcm53xx.h"
-
-#define BCM53XXSPI_MAX_SPI_BAUD 13500000 /* 216 MHz? */
-#define BCM53XXSPI_FLASH_WINDOW SZ_32M
-
-/* The longest observed required wait was 19 ms */
-#define BCM53XXSPI_SPE_TIMEOUT_MS 80
-
-struct bcm53xxspi {
- struct bcma_device *core;
- struct spi_master *master;
- void __iomem *mmio_base;
- bool bspi; /* Boot SPI mode with memory mapping */
-};
-
-static inline u32 bcm53xxspi_read(struct bcm53xxspi *b53spi, u16 offset)
-{
- return bcma_read32(b53spi->core, offset);
-}
-
-static inline void bcm53xxspi_write(struct bcm53xxspi *b53spi, u16 offset,
- u32 value)
-{
- bcma_write32(b53spi->core, offset, value);
-}
-
-static void bcm53xxspi_disable_bspi(struct bcm53xxspi *b53spi)
-{
- struct device *dev = &b53spi->core->dev;
- unsigned long deadline;
- u32 tmp;
-
- if (!b53spi->bspi)
- return;
-
- tmp = bcm53xxspi_read(b53spi, B53SPI_BSPI_MAST_N_BOOT_CTRL);
- if (tmp & 0x1)
- return;
-
- deadline = jiffies + usecs_to_jiffies(200);
- do {
- tmp = bcm53xxspi_read(b53spi, B53SPI_BSPI_BUSY_STATUS);
- if (!(tmp & 0x1)) {
- bcm53xxspi_write(b53spi, B53SPI_BSPI_MAST_N_BOOT_CTRL,
- 0x1);
- ndelay(200);
- b53spi->bspi = false;
- return;
- }
- udelay(1);
- } while (!time_after_eq(jiffies, deadline));
-
- dev_warn(dev, "Timeout disabling BSPI\n");
-}
-
-static void bcm53xxspi_enable_bspi(struct bcm53xxspi *b53spi)
-{
- u32 tmp;
-
- if (b53spi->bspi)
- return;
-
- tmp = bcm53xxspi_read(b53spi, B53SPI_BSPI_MAST_N_BOOT_CTRL);
- if (!(tmp & 0x1))
- return;
-
- bcm53xxspi_write(b53spi, B53SPI_BSPI_MAST_N_BOOT_CTRL, 0x0);
- b53spi->bspi = true;
-}
-
-static inline unsigned int bcm53xxspi_calc_timeout(size_t len)
-{
- /* Do some magic calculation based on length and buad. Add 10% and 1. */
- return (len * 9000 / BCM53XXSPI_MAX_SPI_BAUD * 110 / 100) + 1;
-}
-
-static int bcm53xxspi_wait(struct bcm53xxspi *b53spi, unsigned int timeout_ms)
-{
- unsigned long deadline;
- u32 tmp;
-
- /* SPE bit has to be 0 before we read MSPI STATUS */
- deadline = jiffies + msecs_to_jiffies(BCM53XXSPI_SPE_TIMEOUT_MS);
- do {
- tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_SPCR2);
- if (!(tmp & B53SPI_MSPI_SPCR2_SPE))
- break;
- udelay(5);
- } while (!time_after_eq(jiffies, deadline));
-
- if (tmp & B53SPI_MSPI_SPCR2_SPE)
- goto spi_timeout;
-
- /* Check status */
- deadline = jiffies + msecs_to_jiffies(timeout_ms);
- do {
- tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_MSPI_STATUS);
- if (tmp & B53SPI_MSPI_MSPI_STATUS_SPIF) {
- bcm53xxspi_write(b53spi, B53SPI_MSPI_MSPI_STATUS, 0);
- return 0;
- }
-
- cpu_relax();
- udelay(100);
- } while (!time_after_eq(jiffies, deadline));
-
-spi_timeout:
- bcm53xxspi_write(b53spi, B53SPI_MSPI_MSPI_STATUS, 0);
-
- pr_err("Timeout waiting for SPI to be ready!\n");
-
- return -EBUSY;
-}
-
-static void bcm53xxspi_buf_write(struct bcm53xxspi *b53spi, u8 *w_buf,
- size_t len, bool cont)
-{
- u32 tmp;
- int i;
-
- for (i = 0; i < len; i++) {
- /* Transmit Register File MSB */
- bcm53xxspi_write(b53spi, B53SPI_MSPI_TXRAM + 4 * (i * 2),
- (unsigned int)w_buf[i]);
- }
-
- for (i = 0; i < len; i++) {
- tmp = B53SPI_CDRAM_CONT | B53SPI_CDRAM_PCS_DISABLE_ALL |
- B53SPI_CDRAM_PCS_DSCK;
- if (!cont && i == len - 1)
- tmp &= ~B53SPI_CDRAM_CONT;
- tmp &= ~0x1;
- /* Command Register File */
- bcm53xxspi_write(b53spi, B53SPI_MSPI_CDRAM + 4 * i, tmp);
- }
-
- /* Set queue pointers */
- bcm53xxspi_write(b53spi, B53SPI_MSPI_NEWQP, 0);
- bcm53xxspi_write(b53spi, B53SPI_MSPI_ENDQP, len - 1);
-
- if (cont)
- bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 1);
-
- /* Start SPI transfer */
- tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_SPCR2);
- tmp |= B53SPI_MSPI_SPCR2_SPE;
- if (cont)
- tmp |= B53SPI_MSPI_SPCR2_CONT_AFTER_CMD;
- bcm53xxspi_write(b53spi, B53SPI_MSPI_SPCR2, tmp);
-
- /* Wait for SPI to finish */
- bcm53xxspi_wait(b53spi, bcm53xxspi_calc_timeout(len));
-
- if (!cont)
- bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 0);
-}
-
-static void bcm53xxspi_buf_read(struct bcm53xxspi *b53spi, u8 *r_buf,
- size_t len, bool cont)
-{
- u32 tmp;
- int i;
-
- for (i = 0; i < len; i++) {
- tmp = B53SPI_CDRAM_CONT | B53SPI_CDRAM_PCS_DISABLE_ALL |
- B53SPI_CDRAM_PCS_DSCK;
- if (!cont && i == len - 1)
- tmp &= ~B53SPI_CDRAM_CONT;
- tmp &= ~0x1;
- /* Command Register File */
- bcm53xxspi_write(b53spi, B53SPI_MSPI_CDRAM + 4 * i, tmp);
- }
-
- /* Set queue pointers */
- bcm53xxspi_write(b53spi, B53SPI_MSPI_NEWQP, 0);
- bcm53xxspi_write(b53spi, B53SPI_MSPI_ENDQP, len - 1);
-
- if (cont)
- bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 1);
-
- /* Start SPI transfer */
- tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_SPCR2);
- tmp |= B53SPI_MSPI_SPCR2_SPE;
- if (cont)
- tmp |= B53SPI_MSPI_SPCR2_CONT_AFTER_CMD;
- bcm53xxspi_write(b53spi, B53SPI_MSPI_SPCR2, tmp);
-
- /* Wait for SPI to finish */
- bcm53xxspi_wait(b53spi, bcm53xxspi_calc_timeout(len));
-
- if (!cont)
- bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 0);
-
- for (i = 0; i < len; ++i) {
- u16 reg = B53SPI_MSPI_RXRAM + 4 * (1 + i * 2);
-
- /* Data stored in the transmit register file LSB */
- r_buf[i] = (u8)bcm53xxspi_read(b53spi, reg);
- }
-}
-
-static int bcm53xxspi_transfer_one(struct spi_master *master,
- struct spi_device *spi,
- struct spi_transfer *t)
-{
- struct bcm53xxspi *b53spi = spi_master_get_devdata(master);
- u8 *buf;
- size_t left;
-
- bcm53xxspi_disable_bspi(b53spi);
-
- if (t->tx_buf) {
- buf = (u8 *)t->tx_buf;
- left = t->len;
- while (left) {
- size_t to_write = min_t(size_t, 16, left);
- bool cont = !spi_transfer_is_last(master, t) ||
- left - to_write > 0;
-
- bcm53xxspi_buf_write(b53spi, buf, to_write, cont);
- left -= to_write;
- buf += to_write;
- }
- }
-
- if (t->rx_buf) {
- buf = (u8 *)t->rx_buf;
- left = t->len;
- while (left) {
- size_t to_read = min_t(size_t, 16, left);
- bool cont = !spi_transfer_is_last(master, t) ||
- left - to_read > 0;
-
- bcm53xxspi_buf_read(b53spi, buf, to_read, cont);
- left -= to_read;
- buf += to_read;
- }
- }
-
- return 0;
-}
-
-static int bcm53xxspi_flash_read(struct spi_device *spi,
- struct spi_flash_read_message *msg)
-{
- struct bcm53xxspi *b53spi = spi_master_get_devdata(spi->master);
- int ret = 0;
-
- if (msg->from + msg->len > BCM53XXSPI_FLASH_WINDOW)
- return -EINVAL;
-
- bcm53xxspi_enable_bspi(b53spi);
- memcpy_fromio(msg->buf, b53spi->mmio_base + msg->from, msg->len);
- msg->retlen = msg->len;
-
- return ret;
-}
-
-/**************************************************
- * BCMA
- **************************************************/
-
-static const struct bcma_device_id bcm53xxspi_bcma_tbl[] = {
- BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_NS_QSPI, BCMA_ANY_REV, BCMA_ANY_CLASS),
- {},
-};
-MODULE_DEVICE_TABLE(bcma, bcm53xxspi_bcma_tbl);
-
-static int bcm53xxspi_bcma_probe(struct bcma_device *core)
-{
- struct device *dev = &core->dev;
- struct bcm53xxspi *b53spi;
- struct spi_master *master;
- int err;
-
- if (core->bus->drv_cc.core->id.rev != 42) {
- pr_err("SPI on SoC with unsupported ChipCommon rev\n");
- return -ENOTSUPP;
- }
-
- master = spi_alloc_master(dev, sizeof(*b53spi));
- if (!master)
- return -ENOMEM;
-
- b53spi = spi_master_get_devdata(master);
- b53spi->master = master;
- b53spi->core = core;
-
- if (core->addr_s[0])
- b53spi->mmio_base = devm_ioremap(dev, core->addr_s[0],
- BCM53XXSPI_FLASH_WINDOW);
- b53spi->bspi = true;
- bcm53xxspi_disable_bspi(b53spi);
-
- master->dev.of_node = dev->of_node;
- master->transfer_one = bcm53xxspi_transfer_one;
- if (b53spi->mmio_base)
- master->spi_flash_read = bcm53xxspi_flash_read;
-
- bcma_set_drvdata(core, b53spi);
-
- err = devm_spi_register_master(dev, master);
- if (err) {
- spi_master_put(master);
- bcma_set_drvdata(core, NULL);
- return err;
- }
-
- return 0;
-}
-
-static struct bcma_driver bcm53xxspi_bcma_driver = {
- .name = KBUILD_MODNAME,
- .id_table = bcm53xxspi_bcma_tbl,
- .probe = bcm53xxspi_bcma_probe,
-};
-
-/**************************************************
- * Init & exit
- **************************************************/
-
-static int __init bcm53xxspi_module_init(void)
-{
- int err = 0;
-
- err = bcma_driver_register(&bcm53xxspi_bcma_driver);
- if (err)
- pr_err("Failed to register bcma driver: %d\n", err);
-
- return err;
-}
-
-static void __exit bcm53xxspi_module_exit(void)
-{
- bcma_driver_unregister(&bcm53xxspi_bcma_driver);
-}
-
-module_init(bcm53xxspi_module_init);
-module_exit(bcm53xxspi_module_exit);
-
-MODULE_DESCRIPTION("Broadcom BCM53xx SPI Controller driver");
-MODULE_AUTHOR("Rafał Miłecki <zajec5@gmail.com>");
-MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-17 12:02:13 +0300