+++ /dev/null
-/*
- * Driver of Andes SPI Controller
- *
- * (C) Copyright 2011 Andes Technology
- * Macpaul Lin <macpaul@andestech.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-#include <common.h>
-#include <malloc.h>
-#include <spi.h>
-
-#include <asm/io.h>
-#include "andes_spi.h"
-
-void spi_init(void)
-{
- /* do nothing */
-}
-
-static void andes_spi_spit_en(struct andes_spi_slave *ds)
-{
- unsigned int dcr = readl(&ds->regs->dcr);
-
- debug("%s: dcr: %x, write value: %x\n",
- __func__, dcr, (dcr | ANDES_SPI_DCR_SPIT));
-
- writel((dcr | ANDES_SPI_DCR_SPIT), &ds->regs->dcr);
-}
-
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
- unsigned int max_hz, unsigned int mode)
-{
- struct andes_spi_slave *ds;
-
- if (!spi_cs_is_valid(bus, cs))
- return NULL;
-
- ds = spi_alloc_slave(struct andes_spi_slave, bus, cs);
- if (!ds)
- return NULL;
-
- ds->regs = (struct andes_spi_regs *)CONFIG_SYS_SPI_BASE;
-
- /*
- * The hardware of andes_spi will set its frequency according
- * to APB/AHB bus clock. Hence the hardware doesn't allow changing of
- * requency and so the user requested speed is always ignored.
- */
- ds->freq = max_hz;
-
- return &ds->slave;
-}
-
-void spi_free_slave(struct spi_slave *slave)
-{
- struct andes_spi_slave *ds = to_andes_spi(slave);
-
- free(ds);
-}
-
-int spi_claim_bus(struct spi_slave *slave)
-{
- struct andes_spi_slave *ds = to_andes_spi(slave);
- unsigned int apb;
- unsigned int baud;
-
- /* Enable the SPI hardware */
- writel(ANDES_SPI_CR_SPIRST, &ds->regs->cr);
- udelay(1000);
-
- /* setup format */
- baud = ((CONFIG_SYS_CLK_FREQ / CONFIG_SYS_SPI_CLK / 2) - 1) & 0xFF;
-
- /*
- * SPI_CLK = AHB bus clock / ((BAUD + 1)*2)
- * BAUD = AHB bus clock / SPI_CLK / 2) - 1
- */
- apb = (readl(&ds->regs->apb) & 0xffffff00) | baud;
- writel(apb, &ds->regs->apb);
-
- /* no interrupts */
- writel(0, &ds->regs->ie);
-
- return 0;
-}
-
-void spi_release_bus(struct spi_slave *slave)
-{
- struct andes_spi_slave *ds = to_andes_spi(slave);
-
- /* Disable the SPI hardware */
- writel(ANDES_SPI_CR_SPIRST, &ds->regs->cr);
-}
-
-static int andes_spi_read(struct spi_slave *slave, unsigned int len,
- u8 *rxp, unsigned long flags)
-{
- struct andes_spi_slave *ds = to_andes_spi(slave);
- unsigned int i, left;
- unsigned int data;
-
- debug("%s: slave: %x, len: %d, rxp: %x, flags: %d\n",
- __func__, slave, len, rxp, flags);
-
- debug("%s: data: ", __func__);
- while (len > 0) {
- left = min(len, 4);
- data = readl(&ds->regs->data);
-
- debug(" ");
- for (i = 0; i < left; i++) {
- debug("%02x ", data & 0xff);
- *rxp++ = data;
- data >>= 8;
- len--;
- }
- }
- debug("\n");
-
- return 0;
-}
-
-static int andes_spi_write(struct spi_slave *slave, unsigned int wlen,
- unsigned int rlen, const u8 *txp, unsigned long flags)
-{
- struct andes_spi_slave *ds = to_andes_spi(slave);
- unsigned int data;
- unsigned int i, left;
- unsigned int spit_enabled = 0;
-
- debug("%s: slave: %x, wlen: %d, rlen: %d, txp: %x, flags: %x\n",
- __func__, slave, wlen, rlen, txp, flags);
-
- /* The value of wlen and rlen wrote to register must minus 1 */
- if (rlen == 0) /* write only */
- writel(ANDES_SPI_DCR_MODE_WO | ANDES_SPI_DCR_WCNT(wlen-1) |
- ANDES_SPI_DCR_RCNT(0), &ds->regs->dcr);
- else /* write then read */
- writel(ANDES_SPI_DCR_MODE_WR | ANDES_SPI_DCR_WCNT(wlen-1) |
- ANDES_SPI_DCR_RCNT(rlen-1), &ds->regs->dcr);
-
- /* wait till SPIBSY is cleared */
- while (readl(&ds->regs->st) & ANDES_SPI_ST_SPIBSY)
- ;
-
- /* data write process */
- debug("%s: txp: ", __func__);
- while (wlen > 0) {
- /* clear the data */
- data = 0;
-
- /* data are usually be read 32bits once a time */
- left = min(wlen, 4);
-
- for (i = 0; i < left; i++) {
- debug("%x ", *txp);
- data |= *txp++ << (i * 8);
- wlen--;
- }
- debug("\n");
-
- debug("data: %08x\n", data);
- debug("streg before write: %08x\n", readl(&ds->regs->st));
- /* wait till TXFULL is deasserted */
- while (readl(&ds->regs->st) & ANDES_SPI_ST_TXFEL)
- ;
- writel(data, &ds->regs->data);
- debug("streg after write: %08x\n", readl(&ds->regs->st));
-
-
- if (spit_enabled == 0) {
- /* enable SPIT bit - trigger the tx and rx progress */
- andes_spi_spit_en(ds);
- spit_enabled = 1;
- }
-
- }
- debug("\n");
-
- return 0;
-}
-
-/*
- * spi_xfer:
- * Since andes_spi doesn't support independent command transaction,
- * that is, write and than read must be operated in continuous
- * execution, there is no need to set dcr and trigger spit again in
- * RX process.
- */
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
- const void *dout, void *din, unsigned long flags)
-{
- unsigned int len;
- static int op_nextime;
- static u8 tmp_cmd[5];
- static int tmp_wlen;
- unsigned int i;
-
- if (bitlen == 0)
- /* Finish any previously submitted transfers */
- goto out;
-
- if (bitlen % 8) {
- /* Errors always terminate an ongoing transfer */
- flags |= SPI_XFER_END;
- goto out;
- }
-
- len = bitlen / 8;
-
- debug("%s: slave: %08x, bitlen: %d, dout: "
- "%08x, din: %08x, flags: %d, len: %d\n",
- __func__, slave, bitlen, dout, din, flags, len);
-
- /*
- * Important:
- * andes_spi's hardware doesn't support 2 data channel. The read
- * and write cmd/data share the same register (data register).
- *
- * If a command has write and read transaction, you cannot do write
- * this time and then do read on next time.
- *
- * A command writes first with a read response must indicating
- * the read length in write operation. Hence the write action must
- * be stored temporary and wait until the next read action has been
- * arrived. Then we flush the write and read action out together.
- */
- if (!dout) {
- if (op_nextime == 1) {
- /* flags should be SPI_XFER_END, value is 2 */
- op_nextime = 0;
- andes_spi_write(slave, tmp_wlen, len, tmp_cmd, flags);
- }
- return andes_spi_read(slave, len, din, flags);
- } else if (!din) {
- if (flags == SPI_XFER_BEGIN) {
- /* store the write command and do operation next time */
- op_nextime = 1;
- memset(tmp_cmd, 0, sizeof(tmp_cmd));
- memcpy(tmp_cmd, dout, len);
-
- debug("%s: tmp_cmd: ", __func__);
- for (i = 0; i < len; i++)
- debug("%x ", *(tmp_cmd + i));
- debug("\n");
-
- tmp_wlen = len;
- } else {
- /*
- * flags should be (SPI_XFER_BEGIN | SPI_XFER_END),
- * the value is 3.
- */
- if (op_nextime == 1) {
- /* flags should be SPI_XFER_END, value is 2 */
- op_nextime = 0;
- /* flags 3 implies write only */
- andes_spi_write(slave, tmp_wlen, 0, tmp_cmd, 3);
- }
-
- debug("flags: %x\n", flags);
- return andes_spi_write(slave, len, 0, dout, flags);
- }
- }
-
-out:
- return 0;
-}
-
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
-{
- return bus == 0 && cs == 0;
-}
-
-void spi_cs_activate(struct spi_slave *slave)
-{
- /* do nothing */
-}
-
-void spi_cs_deactivate(struct spi_slave *slave)
-{
- /* do nothing */
-}
+++ /dev/null
-/*
- * Register definitions for the Andes SPI Controller
- *
- * (C) Copyright 2011 Andes Technology
- * Macpaul Lin <macpaul@andestech.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-#ifndef __ANDES_SPI_H
-#define __ANDES_SPI_H
-
-struct andes_spi_regs {
- unsigned int apb; /* 0x00 - APB SPI interface setting */
- unsigned int pio; /* 0x04 - PIO reg */
- unsigned int cr; /* 0x08 - SPI Control reg */
- unsigned int st; /* 0x0c - SPI Status reg */
- unsigned int ie; /* 0x10 - Interrupt Enable reg */
- unsigned int ist; /* 0x14 - Interrupt Status reg */
- unsigned int dcr; /* 0x18 - data control reg */
- unsigned int data; /* 0x1c - data register */
- unsigned int ahb; /* 0x20 - AHB SPI interface setting */
- unsigned int ver; /* 0x3c - SPI version reg */
-};
-
-#define BIT(x) (1 << (x))
-
-/* 0x00 - APB SPI interface setting register */
-#define ANDES_SPI_APB_BAUD(x) (((x) & 0xff) < 0)
-#define ANDES_SPI_APB_CSHT(x) (((x) & 0xf) < 16)
-#define ANDES_SPI_APB_SPNTS BIT(20) /* 0: normal, 1: delay */
-#define ANDES_SPI_APB_CPHA BIT(24) /* 0: Sampling at odd edges */
-#define ANDES_SPI_APB_CPOL BIT(25) /* 0: SCK low, 1: SCK high */
-#define ANDES_SPI_APB_MSSL BIT(26) /* 0: SPI Master, 1: slave */
-
-/* 0x04 - PIO register */
-#define ANDES_SPI_PIO_MISO BIT(0) /* input value of pin MISO */
-#define ANDES_SPI_PIO_MOSI BIT(1) /* I/O value of pin MOSI */
-#define ANDES_SPI_PIO_SCK BIT(2) /* I/O value of pin SCK */
-#define ANDES_SPI_PIO_CS BIT(3) /* I/O value of pin CS */
-#define ANDES_SPI_PIO_PIOE BIT(4) /* Programming IO Enable */
-
-/* 0x08 - SPI Control register */
-#define ANDES_SPI_CR_SPIRST BIT(0) /* SPI mode reset */
-#define ANDES_SPI_CR_RXFRST BIT(1) /* RxFIFO reset */
-#define ANDES_SPI_CR_TXFRST BIT(2) /* TxFIFO reset */
-#define ANDES_SPI_CR_RXFTH(x) (((x) & 0x1f) << 10) /* RxFIFO Threshold */
-#define ANDES_SPI_CR_TXFTH(x) (((x) & 0x1f) << 18) /* TxFIFO Threshold */
-
-/* 0x0c - SPI Status register */
-#define ANDES_SPI_ST_SPIBSY BIT(0) /* SPI Transfer is active */
-#define ANDES_SPI_ST_RXFEM BIT(8) /* RxFIFO Empty Flag */
-#define ANDES_SPI_ST_RXFEL BIT(9) /* RxFIFO Full Flag */
-#define ANDES_SPI_ST_RXFVE(x) (((x) >> 10) & 0x1f)
-#define ANDES_SPI_ST_TXFEM BIT(16) /* TxFIFO Empty Flag */
-#define ANDES_SPI_ST_TXFEL BIT(7) /* TxFIFO Full Flag */
-#define ANDES_SPI_ST_TXFVE(x) (((x) >> 18) & 0x1f)
-
-/* 0x10 - Interrupt Enable register */
-#define ANDES_SPI_IE_RXFORIE BIT(0) /* RxFIFO overrun intr */
-#define ANDES_SPI_IE_TXFURIE BIT(1) /* TxFOFO underrun intr */
-#define ANDES_SPI_IE_RXFTHIE BIT(2) /* RxFIFO threshold intr */
-#define ANDES_SPI_IE_TXFTHIE BIT(3) /* TxFIFO threshold intr */
-#define ANDES_SPI_IE_SPIEIE BIT(4) /* SPI transmit END intr */
-#define ANDES_SPI_IE_SPCFIE BIT(5) /* AHB/APB TxReq conflict */
-
-/* 0x14 - Interrupt Status Register */
-#define ANDES_SPI_IST_RXFORI BIT(0) /* has RxFIFO overrun */
-#define ANDES_SPI_IST_TXFURI BIT(1) /* has TxFOFO underrun */
-#define ANDES_SPI_IST_RXFTHI BIT(2) /* has RxFIFO threshold */
-#define ANDES_SPI_IST_TXFTHI BIT(3) /* has TxFIFO threshold */
-#define ANDES_SPI_IST_SPIEI BIT(4) /* has SPI transmit END */
-#define ANDES_SPI_IST_SPCFI BIT(5) /* has AHB/APB TxReq conflict */
-
-/* 0x18 - Data Control Register */
-#define ANDES_SPI_DCR_RCNT(x) (((x) & 0x3ff) << 0)
-#define ANDES_SPI_DCR_DYCNT(x) (((x) & 0x7) << 12)
-#define ANDES_SPI_DCR_WCNT(x) (((x) & 0x3ff) << 16)
-#define ANDES_SPI_DCR_TRAMODE(x) (((x) & 0x7) << 28)
-#define ANDES_SPI_DCR_SPIT BIT(31) /* SPI bus trigger */
-
-#define ANDES_SPI_DCR_MODE_WRCON ANDES_SPI_DCR_TRAMODE(0) /* w/r at the same time */
-#define ANDES_SPI_DCR_MODE_WO ANDES_SPI_DCR_TRAMODE(1) /* write only */
-#define ANDES_SPI_DCR_MODE_RO ANDES_SPI_DCR_TRAMODE(2) /* read only */
-#define ANDES_SPI_DCR_MODE_WR ANDES_SPI_DCR_TRAMODE(3) /* write, read */
-#define ANDES_SPI_DCR_MODE_RW ANDES_SPI_DCR_TRAMODE(4) /* read, write */
-#define ANDES_SPI_DCR_MODE_WDR ANDES_SPI_DCR_TRAMODE(5) /* write, dummy, read */
-#define ANDES_SPI_DCR_MODE_RDW ANDES_SPI_DCR_TRAMODE(6) /* read, dummy, write */
-#define ANDES_SPI_DCR_MODE_RECEIVE ANDES_SPI_DCR_TRAMODE(7) /* receive */
-
-/* 0x20 - AHB SPI interface setting register */
-#define ANDES_SPI_AHB_BAUD(x) (((x) & 0xff) < 0)
-#define ANDES_SPI_AHB_CSHT(x) (((x) & 0xf) < 16)
-#define ANDES_SPI_AHB_SPNTS BIT(20) /* 0: normal, 1: delay */
-#define ANDES_SPI_AHB_CPHA BIT(24) /* 0: Sampling at odd edges */
-#define ANDES_SPI_AHB_CPOL BIT(25) /* 0: SCK low, 1: SCK high */
-#define ANDES_SPI_AHB_MSSL BIT(26) /* only Master mode */
-
-/* 0x3c - Version Register - (Year V.MAJOR.MINOR) */
-#define ANDES_SPI_VER_MINOR(x) (((x) >> 0) & 0xf)
-#define ANDES_SPI_VER_MAJOR(x) (((x) >> 8) & 0xf)
-#define ANDES_SPI_VER_YEAR(x) (((x) >> 16) & 0xf)
-
-struct andes_spi_slave {
- struct spi_slave slave;
- struct andes_spi_regs *regs;
- unsigned int freq;
-};
-
-static inline struct andes_spi_slave *to_andes_spi(struct spi_slave *slave)
-{
- return container_of(slave, struct andes_spi_slave, slave);
-}
-
-#endif /* __ANDES_SPI_H */
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