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drivers/spi/altera_spi.c
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/* * Altera SPI driver * * based on bfin_spi.c * Copyright (c) 2005-2008 Analog Devices Inc. * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <dm.h> #include <errno.h> #include <malloc.h> #include <fdtdec.h> #include <spi.h> #include <asm/io.h> DECLARE_GLOBAL_DATA_PTR; #define ALTERA_SPI_STATUS_RRDY_MSK BIT(7) #define ALTERA_SPI_CONTROL_SSO_MSK BIT(10) #ifndef CONFIG_ALTERA_SPI_IDLE_VAL #define CONFIG_ALTERA_SPI_IDLE_VAL 0xff #endif struct altera_spi_regs { u32 rxdata; u32 txdata; u32 status; u32 control; u32 _reserved; u32 slave_sel; }; struct altera_spi_platdata { struct altera_spi_regs *regs; }; struct altera_spi_priv { struct altera_spi_regs *regs; }; static void spi_cs_activate(struct udevice *dev, uint cs) { struct udevice *bus = dev->parent; struct altera_spi_priv *priv = dev_get_priv(bus); struct altera_spi_regs *const regs = priv->regs; writel(1 << cs, ®s->slave_sel); writel(ALTERA_SPI_CONTROL_SSO_MSK, ®s->control); } static void spi_cs_deactivate(struct udevice *dev) { struct udevice *bus = dev->parent; struct altera_spi_priv *priv = dev_get_priv(bus); struct altera_spi_regs *const regs = priv->regs; writel(0, ®s->control); writel(0, ®s->slave_sel); } static int altera_spi_claim_bus(struct udevice *dev) { struct udevice *bus = dev->parent; struct altera_spi_priv *priv = dev_get_priv(bus); struct altera_spi_regs *const regs = priv->regs; writel(0, ®s->control); writel(0, ®s->slave_sel); return 0; } static int altera_spi_release_bus(struct udevice *dev) { struct udevice *bus = dev->parent; struct altera_spi_priv *priv = dev_get_priv(bus); struct altera_spi_regs *const regs = priv->regs; writel(0, ®s->slave_sel); return 0; } static int altera_spi_xfer(struct udevice *dev, unsigned int bitlen, const void *dout, void *din, unsigned long flags) { struct udevice *bus = dev->parent; struct altera_spi_priv *priv = dev_get_priv(bus); struct altera_spi_regs *const regs = priv->regs; struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev); /* assume spi core configured to do 8 bit transfers */ unsigned int bytes = bitlen / 8; const unsigned char *txp = dout; unsigned char *rxp = din; uint32_t reg, data, start; debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx ", __func__, bus->seq, slave_plat->cs, bitlen, bytes, flags); if (bitlen == 0) goto done; if (bitlen % 8) { flags |= SPI_XFER_END; goto done; } /* empty read buffer */ if (readl(®s->status) & ALTERA_SPI_STATUS_RRDY_MSK) readl(®s->rxdata); if (flags & SPI_XFER_BEGIN) spi_cs_activate(dev, slave_plat->cs); while (bytes--) { if (txp) data = *txp++; else data = CONFIG_ALTERA_SPI_IDLE_VAL; debug("%s: tx:%x ", __func__, data); writel(data, ®s->txdata); start = get_timer(0); while (1) { reg = readl(®s->status); if (reg & ALTERA_SPI_STATUS_RRDY_MSK) break; if (get_timer(start) > (CONFIG_SYS_HZ / 1000)) { debug("%s: Transmission timed out! ", __func__); return -1; } } data = readl(®s->rxdata); if (rxp) *rxp++ = data & 0xff; debug("rx:%x ", data); } done: if (flags & SPI_XFER_END) spi_cs_deactivate(dev); return 0; } static int altera_spi_set_speed(struct udevice *bus, uint speed) { return 0; } static int altera_spi_set_mode(struct udevice *bus, uint mode) { return 0; } static int altera_spi_probe(struct udevice *bus) { struct altera_spi_platdata *plat = dev_get_platdata(bus); struct altera_spi_priv *priv = dev_get_priv(bus); priv->regs = plat->regs; return 0; } static int altera_spi_ofdata_to_platdata(struct udevice *bus) { struct altera_spi_platdata *plat = dev_get_platdata(bus); plat->regs = map_physmem(devfdt_get_addr(bus), sizeof(struct altera_spi_regs), MAP_NOCACHE); return 0; } static const struct dm_spi_ops altera_spi_ops = { .claim_bus = altera_spi_claim_bus, .release_bus = altera_spi_release_bus, .xfer = altera_spi_xfer, .set_speed = altera_spi_set_speed, .set_mode = altera_spi_set_mode, /* * cs_info is not needed, since we require all chip selects to be * in the device tree explicitly */ }; static const struct udevice_id altera_spi_ids[] = { { .compatible = "altr,spi-1.0" }, {} }; U_BOOT_DRIVER(altera_spi) = { .name = "altera_spi", .id = UCLASS_SPI, .of_match = altera_spi_ids, .ops = &altera_spi_ops, .ofdata_to_platdata = altera_spi_ofdata_to_platdata, .platdata_auto_alloc_size = sizeof(struct altera_spi_platdata), .priv_auto_alloc_size = sizeof(struct altera_spi_priv), .probe = altera_spi_probe, }; |