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c53b318e1b
On x86 platforms the SPI flash can be mapped into memory so that the contents can be read with normal memory accesses. Add a new SPI method to find the location of the SPI flash in memory. This differs from the existing device-tree "memory-map" mechanism in that the location can be discovered at run-time. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
499 lines
11 KiB
C
499 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2014 Google, Inc
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <malloc.h>
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#include <spi.h>
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#include <dm/device-internal.h>
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#include <dm/uclass-internal.h>
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#include <dm/lists.h>
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#include <dm/util.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define SPI_DEFAULT_SPEED_HZ 100000
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static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
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{
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struct dm_spi_ops *ops;
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int ret;
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ops = spi_get_ops(bus);
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if (ops->set_speed)
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ret = ops->set_speed(bus, speed);
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else
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ret = -EINVAL;
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if (ret) {
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printf("Cannot set speed (err=%d)\n", ret);
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return ret;
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}
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if (ops->set_mode)
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ret = ops->set_mode(bus, mode);
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else
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ret = -EINVAL;
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if (ret) {
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printf("Cannot set mode (err=%d)\n", ret);
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return ret;
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}
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return 0;
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}
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int dm_spi_claim_bus(struct udevice *dev)
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{
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struct udevice *bus = dev->parent;
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struct dm_spi_ops *ops = spi_get_ops(bus);
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struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
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struct spi_slave *slave = dev_get_parent_priv(dev);
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int speed;
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speed = slave->max_hz;
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if (spi->max_hz) {
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if (speed)
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speed = min(speed, (int)spi->max_hz);
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else
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speed = spi->max_hz;
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}
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if (!speed)
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speed = SPI_DEFAULT_SPEED_HZ;
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if (speed != slave->speed) {
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int ret = spi_set_speed_mode(bus, speed, slave->mode);
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if (ret)
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return log_ret(ret);
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slave->speed = speed;
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}
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return log_ret(ops->claim_bus ? ops->claim_bus(dev) : 0);
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}
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void dm_spi_release_bus(struct udevice *dev)
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{
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struct udevice *bus = dev->parent;
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struct dm_spi_ops *ops = spi_get_ops(bus);
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if (ops->release_bus)
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ops->release_bus(dev);
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}
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int dm_spi_xfer(struct udevice *dev, unsigned int bitlen,
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const void *dout, void *din, unsigned long flags)
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{
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struct udevice *bus = dev->parent;
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if (bus->uclass->uc_drv->id != UCLASS_SPI)
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return -EOPNOTSUPP;
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return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags);
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}
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int dm_spi_get_mmap(struct udevice *dev, ulong *map_basep, uint *map_sizep,
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uint *offsetp)
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{
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struct udevice *bus = dev->parent;
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struct dm_spi_ops *ops = spi_get_ops(bus);
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if (bus->uclass->uc_drv->id != UCLASS_SPI)
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return -EOPNOTSUPP;
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if (!ops->get_mmap)
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return -ENOSYS;
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return ops->get_mmap(dev, map_basep, map_sizep, offsetp);
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}
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int spi_claim_bus(struct spi_slave *slave)
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{
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return log_ret(dm_spi_claim_bus(slave->dev));
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}
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void spi_release_bus(struct spi_slave *slave)
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{
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dm_spi_release_bus(slave->dev);
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}
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int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
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const void *dout, void *din, unsigned long flags)
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{
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return dm_spi_xfer(slave->dev, bitlen, dout, din, flags);
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}
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int spi_write_then_read(struct spi_slave *slave, const u8 *opcode,
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size_t n_opcode, const u8 *txbuf, u8 *rxbuf,
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size_t n_buf)
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{
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unsigned long flags = SPI_XFER_BEGIN;
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int ret;
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if (n_buf == 0)
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flags |= SPI_XFER_END;
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ret = spi_xfer(slave, n_opcode * 8, opcode, NULL, flags);
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if (ret) {
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debug("spi: failed to send command (%zu bytes): %d\n",
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n_opcode, ret);
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} else if (n_buf != 0) {
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ret = spi_xfer(slave, n_buf * 8, txbuf, rxbuf, SPI_XFER_END);
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if (ret)
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debug("spi: failed to transfer %zu bytes of data: %d\n",
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n_buf, ret);
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}
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return ret;
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}
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#if !CONFIG_IS_ENABLED(OF_PLATDATA)
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static int spi_child_post_bind(struct udevice *dev)
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{
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struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
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if (!dev_of_valid(dev))
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return 0;
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return spi_slave_ofdata_to_platdata(dev, plat);
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}
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#endif
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static int spi_post_probe(struct udevice *bus)
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{
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#if !CONFIG_IS_ENABLED(OF_PLATDATA)
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struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
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spi->max_hz = dev_read_u32_default(bus, "spi-max-frequency", 0);
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#endif
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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struct dm_spi_ops *ops = spi_get_ops(bus);
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if (ops->claim_bus)
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ops->claim_bus += gd->reloc_off;
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if (ops->release_bus)
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ops->release_bus += gd->reloc_off;
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if (ops->set_wordlen)
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ops->set_wordlen += gd->reloc_off;
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if (ops->xfer)
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ops->xfer += gd->reloc_off;
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if (ops->set_speed)
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ops->set_speed += gd->reloc_off;
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if (ops->set_mode)
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ops->set_mode += gd->reloc_off;
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if (ops->cs_info)
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ops->cs_info += gd->reloc_off;
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#endif
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return 0;
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}
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static int spi_child_pre_probe(struct udevice *dev)
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{
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struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
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struct spi_slave *slave = dev_get_parent_priv(dev);
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/*
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* This is needed because we pass struct spi_slave around the place
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* instead slave->dev (a struct udevice). So we have to have some
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* way to access the slave udevice given struct spi_slave. Once we
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* change the SPI API to use udevice instead of spi_slave, we can
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* drop this.
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*/
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slave->dev = dev;
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slave->max_hz = plat->max_hz;
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slave->mode = plat->mode;
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slave->wordlen = SPI_DEFAULT_WORDLEN;
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return 0;
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}
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int spi_chip_select(struct udevice *dev)
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{
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struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
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return plat ? plat->cs : -ENOENT;
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}
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int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp)
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{
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struct udevice *dev;
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for (device_find_first_child(bus, &dev); dev;
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device_find_next_child(&dev)) {
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struct dm_spi_slave_platdata *plat;
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plat = dev_get_parent_platdata(dev);
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debug("%s: plat=%p, cs=%d\n", __func__, plat, plat->cs);
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if (plat->cs == cs) {
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*devp = dev;
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return 0;
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}
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}
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return -ENODEV;
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}
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int spi_cs_is_valid(unsigned int busnum, unsigned int cs)
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{
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struct spi_cs_info info;
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struct udevice *bus;
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int ret;
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ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
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if (ret) {
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debug("%s: No bus %d\n", __func__, busnum);
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return ret;
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}
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return spi_cs_info(bus, cs, &info);
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}
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int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info)
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{
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struct spi_cs_info local_info;
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struct dm_spi_ops *ops;
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int ret;
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if (!info)
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info = &local_info;
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/* If there is a device attached, return it */
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info->dev = NULL;
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ret = spi_find_chip_select(bus, cs, &info->dev);
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if (!ret)
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return 0;
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/*
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* Otherwise ask the driver. For the moment we don't have CS info.
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* When we do we could provide the driver with a helper function
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* to figure out what chip selects are valid, or just handle the
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* request.
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*/
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ops = spi_get_ops(bus);
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if (ops->cs_info)
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return ops->cs_info(bus, cs, info);
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/*
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* We could assume there is at least one valid chip select.
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* The driver didn't care enough to tell us.
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*/
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return 0;
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}
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int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
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struct udevice **devp)
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{
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struct udevice *bus, *dev;
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int ret;
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ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, false, &bus);
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if (ret) {
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debug("%s: No bus %d\n", __func__, busnum);
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return ret;
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}
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ret = spi_find_chip_select(bus, cs, &dev);
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if (ret) {
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debug("%s: No cs %d\n", __func__, cs);
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return ret;
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}
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*busp = bus;
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*devp = dev;
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return ret;
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}
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int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
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const char *drv_name, const char *dev_name,
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struct udevice **busp, struct spi_slave **devp)
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{
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struct udevice *bus, *dev;
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struct dm_spi_slave_platdata *plat;
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bool created = false;
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int ret;
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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ret = uclass_first_device_err(UCLASS_SPI, &bus);
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#else
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ret = uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus);
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#endif
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if (ret) {
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printf("Invalid bus %d (err=%d)\n", busnum, ret);
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return ret;
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}
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ret = spi_find_chip_select(bus, cs, &dev);
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/*
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* If there is no such device, create one automatically. This means
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* that we don't need a device tree node or platform data for the
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* SPI flash chip - we will bind to the correct driver.
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*/
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if (ret == -ENODEV && drv_name) {
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debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
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__func__, dev_name, busnum, cs, drv_name);
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ret = device_bind_driver(bus, drv_name, dev_name, &dev);
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if (ret) {
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debug("%s: Unable to bind driver (ret=%d)\n", __func__,
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ret);
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return ret;
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}
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plat = dev_get_parent_platdata(dev);
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plat->cs = cs;
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if (speed) {
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plat->max_hz = speed;
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} else {
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printf("Warning: SPI speed fallback to %u kHz\n",
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SPI_DEFAULT_SPEED_HZ / 1000);
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plat->max_hz = SPI_DEFAULT_SPEED_HZ;
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}
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plat->mode = mode;
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created = true;
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} else if (ret) {
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printf("Invalid chip select %d:%d (err=%d)\n", busnum, cs,
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ret);
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return ret;
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}
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if (!device_active(dev)) {
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struct spi_slave *slave;
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ret = device_probe(dev);
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if (ret)
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goto err;
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slave = dev_get_parent_priv(dev);
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slave->dev = dev;
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}
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plat = dev_get_parent_platdata(dev);
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/* get speed and mode from platdata when available */
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if (plat->max_hz) {
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speed = plat->max_hz;
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mode = plat->mode;
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}
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ret = spi_set_speed_mode(bus, speed, mode);
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if (ret)
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goto err;
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*busp = bus;
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*devp = dev_get_parent_priv(dev);
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debug("%s: bus=%p, slave=%p\n", __func__, bus, *devp);
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return 0;
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err:
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debug("%s: Error path, created=%d, device '%s'\n", __func__,
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created, dev->name);
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if (created) {
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device_remove(dev, DM_REMOVE_NORMAL);
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device_unbind(dev);
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}
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return ret;
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}
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/* Compatibility function - to be removed */
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struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
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unsigned int speed, unsigned int mode)
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{
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struct spi_slave *slave;
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struct udevice *dev;
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int ret;
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ret = spi_get_bus_and_cs(busnum, cs, speed, mode, NULL, 0, &dev,
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&slave);
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if (ret)
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return NULL;
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return slave;
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}
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void spi_free_slave(struct spi_slave *slave)
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{
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device_remove(slave->dev, DM_REMOVE_NORMAL);
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slave->dev = NULL;
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}
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int spi_slave_ofdata_to_platdata(struct udevice *dev,
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struct dm_spi_slave_platdata *plat)
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{
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int mode = 0;
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int value;
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plat->cs = dev_read_u32_default(dev, "reg", -1);
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plat->max_hz = dev_read_u32_default(dev, "spi-max-frequency",
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SPI_DEFAULT_SPEED_HZ);
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if (dev_read_bool(dev, "spi-cpol"))
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mode |= SPI_CPOL;
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if (dev_read_bool(dev, "spi-cpha"))
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mode |= SPI_CPHA;
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if (dev_read_bool(dev, "spi-cs-high"))
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mode |= SPI_CS_HIGH;
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if (dev_read_bool(dev, "spi-3wire"))
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mode |= SPI_3WIRE;
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if (dev_read_bool(dev, "spi-half-duplex"))
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mode |= SPI_PREAMBLE;
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/* Device DUAL/QUAD mode */
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value = dev_read_u32_default(dev, "spi-tx-bus-width", 1);
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switch (value) {
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case 1:
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break;
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case 2:
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mode |= SPI_TX_DUAL;
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break;
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case 4:
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mode |= SPI_TX_QUAD;
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break;
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default:
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warn_non_spl("spi-tx-bus-width %d not supported\n", value);
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break;
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}
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value = dev_read_u32_default(dev, "spi-rx-bus-width", 1);
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switch (value) {
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case 1:
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break;
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case 2:
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mode |= SPI_RX_DUAL;
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break;
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case 4:
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mode |= SPI_RX_QUAD;
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break;
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default:
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warn_non_spl("spi-rx-bus-width %d not supported\n", value);
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break;
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}
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plat->mode = mode;
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return 0;
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}
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UCLASS_DRIVER(spi) = {
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.id = UCLASS_SPI,
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.name = "spi",
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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#if !CONFIG_IS_ENABLED(OF_PLATDATA)
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.post_bind = dm_scan_fdt_dev,
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#endif
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.post_probe = spi_post_probe,
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.child_pre_probe = spi_child_pre_probe,
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.per_device_auto_alloc_size = sizeof(struct dm_spi_bus),
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.per_child_auto_alloc_size = sizeof(struct spi_slave),
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.per_child_platdata_auto_alloc_size =
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sizeof(struct dm_spi_slave_platdata),
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#if !CONFIG_IS_ENABLED(OF_PLATDATA)
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.child_post_bind = spi_child_post_bind,
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#endif
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};
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UCLASS_DRIVER(spi_generic) = {
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.id = UCLASS_SPI_GENERIC,
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.name = "spi_generic",
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};
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U_BOOT_DRIVER(spi_generic_drv) = {
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.name = "spi_generic_drv",
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.id = UCLASS_SPI_GENERIC,
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};
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