mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
e2cae51472
Remove spi_init definition which never used on respective code since from many years. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
510 lines
11 KiB
C
510 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2007 Atmel Corporation
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <spi.h>
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#include <malloc.h>
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#include <wait_bit.h>
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#include <asm/io.h>
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#include <asm/arch/clk.h>
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#include <asm/arch/hardware.h>
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#ifdef CONFIG_DM_SPI
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#include <asm/arch/at91_spi.h>
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#endif
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#ifdef CONFIG_DM_GPIO
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#include <asm/gpio.h>
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#endif
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#include "atmel_spi.h"
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#ifndef CONFIG_DM_SPI
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static int spi_has_wdrbt(struct atmel_spi_slave *slave)
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{
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unsigned int ver;
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ver = spi_readl(slave, VERSION);
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return (ATMEL_SPI_VERSION_REV(ver) >= 0x210);
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}
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struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
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unsigned int max_hz, unsigned int mode)
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{
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struct atmel_spi_slave *as;
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unsigned int scbr;
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u32 csrx;
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void *regs;
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if (!spi_cs_is_valid(bus, cs))
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return NULL;
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switch (bus) {
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case 0:
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regs = (void *)ATMEL_BASE_SPI0;
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break;
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#ifdef ATMEL_BASE_SPI1
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case 1:
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regs = (void *)ATMEL_BASE_SPI1;
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break;
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#endif
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#ifdef ATMEL_BASE_SPI2
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case 2:
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regs = (void *)ATMEL_BASE_SPI2;
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break;
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#endif
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#ifdef ATMEL_BASE_SPI3
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case 3:
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regs = (void *)ATMEL_BASE_SPI3;
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break;
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#endif
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default:
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return NULL;
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}
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scbr = (get_spi_clk_rate(bus) + max_hz - 1) / max_hz;
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if (scbr > ATMEL_SPI_CSRx_SCBR_MAX)
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/* Too low max SCK rate */
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return NULL;
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if (scbr < 1)
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scbr = 1;
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csrx = ATMEL_SPI_CSRx_SCBR(scbr);
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csrx |= ATMEL_SPI_CSRx_BITS(ATMEL_SPI_BITS_8);
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if (!(mode & SPI_CPHA))
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csrx |= ATMEL_SPI_CSRx_NCPHA;
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if (mode & SPI_CPOL)
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csrx |= ATMEL_SPI_CSRx_CPOL;
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as = spi_alloc_slave(struct atmel_spi_slave, bus, cs);
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if (!as)
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return NULL;
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as->regs = regs;
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as->mr = ATMEL_SPI_MR_MSTR | ATMEL_SPI_MR_MODFDIS
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| ATMEL_SPI_MR_PCS(~(1 << cs) & 0xf);
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if (spi_has_wdrbt(as))
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as->mr |= ATMEL_SPI_MR_WDRBT;
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spi_writel(as, CSR(cs), csrx);
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return &as->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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struct atmel_spi_slave *as = to_atmel_spi(slave);
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free(as);
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}
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int spi_claim_bus(struct spi_slave *slave)
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{
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struct atmel_spi_slave *as = to_atmel_spi(slave);
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/* Enable the SPI hardware */
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spi_writel(as, CR, ATMEL_SPI_CR_SPIEN);
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/*
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* Select the slave. This should set SCK to the correct
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* initial state, etc.
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*/
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spi_writel(as, MR, as->mr);
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return 0;
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}
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void spi_release_bus(struct spi_slave *slave)
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{
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struct atmel_spi_slave *as = to_atmel_spi(slave);
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/* Disable the SPI hardware */
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spi_writel(as, CR, ATMEL_SPI_CR_SPIDIS);
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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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struct atmel_spi_slave *as = to_atmel_spi(slave);
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unsigned int len_tx;
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unsigned int len_rx;
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unsigned int len;
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u32 status;
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const u8 *txp = dout;
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u8 *rxp = din;
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u8 value;
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if (bitlen == 0)
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/* Finish any previously submitted transfers */
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goto out;
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/*
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* TODO: The controller can do non-multiple-of-8 bit
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* transfers, but this driver currently doesn't support it.
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*
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* It's also not clear how such transfers are supposed to be
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* represented as a stream of bytes...this is a limitation of
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* the current SPI interface.
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*/
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if (bitlen % 8) {
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/* Errors always terminate an ongoing transfer */
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flags |= SPI_XFER_END;
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goto out;
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}
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len = bitlen / 8;
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/*
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* The controller can do automatic CS control, but it is
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* somewhat quirky, and it doesn't really buy us much anyway
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* in the context of U-Boot.
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*/
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if (flags & SPI_XFER_BEGIN) {
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spi_cs_activate(slave);
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/*
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* sometimes the RDR is not empty when we get here,
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* in theory that should not happen, but it DOES happen.
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* Read it here to be on the safe side.
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* That also clears the OVRES flag. Required if the
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* following loop exits due to OVRES!
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*/
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spi_readl(as, RDR);
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}
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for (len_tx = 0, len_rx = 0; len_rx < len; ) {
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status = spi_readl(as, SR);
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if (status & ATMEL_SPI_SR_OVRES)
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return -1;
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if (len_tx < len && (status & ATMEL_SPI_SR_TDRE)) {
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if (txp)
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value = *txp++;
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else
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value = 0;
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spi_writel(as, TDR, value);
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len_tx++;
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}
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if (status & ATMEL_SPI_SR_RDRF) {
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value = spi_readl(as, RDR);
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if (rxp)
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*rxp++ = value;
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len_rx++;
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}
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}
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out:
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if (flags & SPI_XFER_END) {
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/*
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* Wait until the transfer is completely done before
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* we deactivate CS.
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*/
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do {
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status = spi_readl(as, SR);
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} while (!(status & ATMEL_SPI_SR_TXEMPTY));
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spi_cs_deactivate(slave);
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}
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return 0;
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}
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#else
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#define MAX_CS_COUNT 4
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struct atmel_spi_platdata {
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struct at91_spi *regs;
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};
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struct atmel_spi_priv {
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unsigned int freq; /* Default frequency */
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unsigned int mode;
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ulong bus_clk_rate;
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#ifdef CONFIG_DM_GPIO
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struct gpio_desc cs_gpios[MAX_CS_COUNT];
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#endif
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};
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static int atmel_spi_claim_bus(struct udevice *dev)
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{
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struct udevice *bus = dev_get_parent(dev);
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struct atmel_spi_platdata *bus_plat = dev_get_platdata(bus);
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struct atmel_spi_priv *priv = dev_get_priv(bus);
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struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
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struct at91_spi *reg_base = bus_plat->regs;
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u32 cs = slave_plat->cs;
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u32 freq = priv->freq;
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u32 scbr, csrx, mode;
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scbr = (priv->bus_clk_rate + freq - 1) / freq;
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if (scbr > ATMEL_SPI_CSRx_SCBR_MAX)
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return -EINVAL;
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if (scbr < 1)
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scbr = 1;
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csrx = ATMEL_SPI_CSRx_SCBR(scbr);
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csrx |= ATMEL_SPI_CSRx_BITS(ATMEL_SPI_BITS_8);
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if (!(priv->mode & SPI_CPHA))
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csrx |= ATMEL_SPI_CSRx_NCPHA;
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if (priv->mode & SPI_CPOL)
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csrx |= ATMEL_SPI_CSRx_CPOL;
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writel(csrx, ®_base->csr[cs]);
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mode = ATMEL_SPI_MR_MSTR |
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ATMEL_SPI_MR_MODFDIS |
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ATMEL_SPI_MR_WDRBT |
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ATMEL_SPI_MR_PCS(~(1 << cs));
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writel(mode, ®_base->mr);
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writel(ATMEL_SPI_CR_SPIEN, ®_base->cr);
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return 0;
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}
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static int atmel_spi_release_bus(struct udevice *dev)
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{
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struct udevice *bus = dev_get_parent(dev);
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struct atmel_spi_platdata *bus_plat = dev_get_platdata(bus);
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writel(ATMEL_SPI_CR_SPIDIS, &bus_plat->regs->cr);
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return 0;
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}
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static void atmel_spi_cs_activate(struct udevice *dev)
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{
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#ifdef CONFIG_DM_GPIO
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struct udevice *bus = dev_get_parent(dev);
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struct atmel_spi_priv *priv = dev_get_priv(bus);
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struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
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u32 cs = slave_plat->cs;
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if (!dm_gpio_is_valid(&priv->cs_gpios[cs]))
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return;
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dm_gpio_set_value(&priv->cs_gpios[cs], 0);
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#endif
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}
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static void atmel_spi_cs_deactivate(struct udevice *dev)
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{
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#ifdef CONFIG_DM_GPIO
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struct udevice *bus = dev_get_parent(dev);
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struct atmel_spi_priv *priv = dev_get_priv(bus);
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struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
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u32 cs = slave_plat->cs;
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if (!dm_gpio_is_valid(&priv->cs_gpios[cs]))
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return;
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dm_gpio_set_value(&priv->cs_gpios[cs], 1);
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#endif
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}
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static int atmel_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_get_parent(dev);
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struct atmel_spi_platdata *bus_plat = dev_get_platdata(bus);
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struct at91_spi *reg_base = bus_plat->regs;
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u32 len_tx, len_rx, len;
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u32 status;
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const u8 *txp = dout;
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u8 *rxp = din;
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u8 value;
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if (bitlen == 0)
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goto out;
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/*
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* The controller can do non-multiple-of-8 bit
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* transfers, but this driver currently doesn't support it.
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*
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* It's also not clear how such transfers are supposed to be
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* represented as a stream of bytes...this is a limitation of
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* the current SPI interface.
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*/
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if (bitlen % 8) {
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/* Errors always terminate an ongoing transfer */
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flags |= SPI_XFER_END;
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goto out;
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}
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len = bitlen / 8;
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/*
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* The controller can do automatic CS control, but it is
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* somewhat quirky, and it doesn't really buy us much anyway
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* in the context of U-Boot.
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*/
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if (flags & SPI_XFER_BEGIN) {
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atmel_spi_cs_activate(dev);
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/*
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* sometimes the RDR is not empty when we get here,
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* in theory that should not happen, but it DOES happen.
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* Read it here to be on the safe side.
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* That also clears the OVRES flag. Required if the
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* following loop exits due to OVRES!
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*/
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readl(®_base->rdr);
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}
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for (len_tx = 0, len_rx = 0; len_rx < len; ) {
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status = readl(®_base->sr);
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if (status & ATMEL_SPI_SR_OVRES)
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return -1;
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if ((len_tx < len) && (status & ATMEL_SPI_SR_TDRE)) {
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if (txp)
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value = *txp++;
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else
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value = 0;
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writel(value, ®_base->tdr);
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len_tx++;
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}
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if (status & ATMEL_SPI_SR_RDRF) {
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value = readl(®_base->rdr);
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if (rxp)
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*rxp++ = value;
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len_rx++;
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}
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}
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out:
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if (flags & SPI_XFER_END) {
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/*
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* Wait until the transfer is completely done before
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* we deactivate CS.
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*/
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wait_for_bit_le32(®_base->sr,
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ATMEL_SPI_SR_TXEMPTY, true, 1000, false);
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atmel_spi_cs_deactivate(dev);
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}
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return 0;
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}
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static int atmel_spi_set_speed(struct udevice *bus, uint speed)
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{
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struct atmel_spi_priv *priv = dev_get_priv(bus);
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priv->freq = speed;
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return 0;
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}
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static int atmel_spi_set_mode(struct udevice *bus, uint mode)
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{
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struct atmel_spi_priv *priv = dev_get_priv(bus);
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priv->mode = mode;
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return 0;
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}
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static const struct dm_spi_ops atmel_spi_ops = {
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.claim_bus = atmel_spi_claim_bus,
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.release_bus = atmel_spi_release_bus,
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.xfer = atmel_spi_xfer,
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.set_speed = atmel_spi_set_speed,
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.set_mode = atmel_spi_set_mode,
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/*
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* cs_info is not needed, since we require all chip selects to be
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* in the device tree explicitly
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*/
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};
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static int atmel_spi_enable_clk(struct udevice *bus)
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{
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struct atmel_spi_priv *priv = dev_get_priv(bus);
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struct clk clk;
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ulong clk_rate;
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int ret;
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ret = clk_get_by_index(bus, 0, &clk);
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if (ret)
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return -EINVAL;
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ret = clk_enable(&clk);
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if (ret)
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return ret;
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clk_rate = clk_get_rate(&clk);
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if (!clk_rate)
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return -EINVAL;
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priv->bus_clk_rate = clk_rate;
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clk_free(&clk);
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return 0;
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}
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static int atmel_spi_probe(struct udevice *bus)
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{
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struct atmel_spi_platdata *bus_plat = dev_get_platdata(bus);
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int ret;
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ret = atmel_spi_enable_clk(bus);
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if (ret)
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return ret;
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bus_plat->regs = (struct at91_spi *)devfdt_get_addr(bus);
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#ifdef CONFIG_DM_GPIO
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struct atmel_spi_priv *priv = dev_get_priv(bus);
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int i;
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ret = gpio_request_list_by_name(bus, "cs-gpios", priv->cs_gpios,
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ARRAY_SIZE(priv->cs_gpios), 0);
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if (ret < 0) {
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pr_err("Can't get %s gpios! Error: %d", bus->name, ret);
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return ret;
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}
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for(i = 0; i < ARRAY_SIZE(priv->cs_gpios); i++) {
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if (!dm_gpio_is_valid(&priv->cs_gpios[i]))
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continue;
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dm_gpio_set_dir_flags(&priv->cs_gpios[i],
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GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
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}
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#endif
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writel(ATMEL_SPI_CR_SWRST, &bus_plat->regs->cr);
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return 0;
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}
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static const struct udevice_id atmel_spi_ids[] = {
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{ .compatible = "atmel,at91rm9200-spi" },
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{ }
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};
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U_BOOT_DRIVER(atmel_spi) = {
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.name = "atmel_spi",
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.id = UCLASS_SPI,
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.of_match = atmel_spi_ids,
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.ops = &atmel_spi_ops,
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.platdata_auto_alloc_size = sizeof(struct atmel_spi_platdata),
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.priv_auto_alloc_size = sizeof(struct atmel_spi_priv),
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.probe = atmel_spi_probe,
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};
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#endif
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