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Diffstat (limited to 'chip/mchp/gpspi.c')
-rw-r--r--chip/mchp/gpspi.c267
1 files changed, 0 insertions, 267 deletions
diff --git a/chip/mchp/gpspi.c b/chip/mchp/gpspi.c
deleted file mode 100644
index 5234db8260..0000000000
--- a/chip/mchp/gpspi.c
+++ /dev/null
@@ -1,267 +0,0 @@
-/* Copyright 2017 The Chromium OS Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-/* General Purpose SPI master module for MCHP MEC */
-
-#include "common.h"
-#include "console.h"
-#include "dma.h"
-#include "gpio.h"
-#include "registers.h"
-#include "spi.h"
-#include "timer.h"
-#include "util.h"
-#include "hooks.h"
-#include "task.h"
-#include "spi_chip.h"
-#include "gpspi_chip.h"
-#include "tfdp_chip.h"
-
-#define CPUTS(outstr) cputs(CC_SPI, outstr)
-#define CPRINTS(format, args...) cprints(CC_SPI, format, ## args)
-
-#define SPI_BYTE_TRANSFER_TIMEOUT_US (3 * MSEC)
-/* One byte at 12 MHz full duplex = 0.67 us */
-#define SPI_BYTE_TRANSFER_POLL_INTERVAL_US 20
-
-/*
- * GP-SPI
- */
-
-/**
- * Return zero based GPSPI controller index given hardware port.
- * @param hw_port b[7:4]==1 (GPSPI), b[3:0]=0(GPSPI0), 1(GPSPI1)
- * @return 0(GPSPI0) or 1(GPSPI1)
- */
-static uint8_t gpspi_port_to_ctrl_id(uint8_t hw_port)
-{
- return (hw_port & 0x01);
-}
-
-static int gpspi_wait_byte(const int ctrl)
-{
- timestamp_t deadline;
-
- deadline.val = get_time().val + SPI_BYTE_TRANSFER_TIMEOUT_US;
- while ((MCHP_SPI_SR(ctrl) & 0x3) != 0x3) {
- if (timestamp_expired(deadline, NULL))
- return EC_ERROR_TIMEOUT;
- usleep(SPI_BYTE_TRANSFER_POLL_INTERVAL_US);
- }
- return EC_SUCCESS;
-}
-
-/* NOTE: auto-read must be disabled before calling this routine! */
-static void gpspi_rx_fifo_clean(const int ctrl)
-{
- uint8_t unused = 0;
-
- /* If ACTIVE and/or RXFF then clean it */
- if ((MCHP_SPI_SR(ctrl) & 0x4) == 0x4)
- unused += MCHP_SPI_RD(ctrl);
-
- if ((MCHP_SPI_SR(ctrl) & 0x2) == 0x2)
- unused += MCHP_SPI_RD(ctrl);
-}
-/*
- * NOTE: auto-read must be disabled before calling this routine!
- */
-#ifndef CONFIG_MCHP_GPSPI_TX_DMA
-static int gpspi_tx(const int ctrl, const uint8_t *txdata, int txlen)
-{
- int i;
- int ret;
- uint8_t unused = 0;
-
- gpspi_rx_fifo_clean(ctrl);
-
- ret = EC_SUCCESS;
- for (i = 0; i < txlen; ++i) {
- MCHP_SPI_TD(ctrl) = txdata[i];
- ret = gpspi_wait_byte(ctrl);
- if (ret != EC_SUCCESS)
- break;
- unused += MCHP_SPI_RD(ctrl);
- }
-
- return ret;
-}
-#endif
-
-int gpspi_transaction_async(const struct spi_device_t *spi_device,
- const uint8_t *txdata, int txlen,
- uint8_t *rxdata, int rxlen)
-{
- int hw_port, ctrl;
- int ret = EC_SUCCESS;
- int cs_asserted = 0;
- const struct dma_option *opdma;
-#ifdef CONFIG_MCHP_GPSPI_TX_DMA
- dma_chan_t *chan;
-#endif
- if (spi_device == NULL)
- return EC_ERROR_PARAM1;
-
- hw_port = spi_device->port;
-
- ctrl = gpspi_port_to_ctrl_id(hw_port);
-
- /* Disable auto read */
- MCHP_SPI_CR(ctrl) &= ~BIT(5);
-
- if ((txdata != NULL) && (txdata != 0)) {
-#ifdef CONFIG_MCHP_GPSPI_TX_DMA
- opdma = spi_dma_option(spi_device, SPI_DMA_OPTION_WR);
- if (opdma == NULL)
- return EC_ERROR_INVAL;
-
- gpspi_rx_fifo_clean(ctrl);
-
- dma_prepare_tx(opdma, txlen, txdata);
-
- chan = dma_get_channel(opdma->channel);
-
- gpio_set_level(spi_device->gpio_cs, 0);
- cs_asserted = 1;
-
- dma_go(chan);
- ret = dma_wait(opdma->channel);
- if (ret == EC_SUCCESS)
- ret = gpspi_wait_byte(ctrl);
-
- dma_disable(opdma->channel);
- dma_clear_isr(opdma->channel);
-
- gpspi_rx_fifo_clean(ctrl);
-#else
- gpio_set_level(spi_device->gpio_cs, 0);
- cs_asserted = 1;
-
- ret = gpspi_tx(ctrl, txdata, txlen);
-#endif
- }
-
- if (ret == EC_SUCCESS)
- if ((rxlen != 0) && (rxdata != NULL)) {
- ret = EC_ERROR_INVAL;
- opdma = spi_dma_option(spi_device, SPI_DMA_OPTION_RD);
- if (opdma != NULL) {
- if (!cs_asserted)
- gpio_set_level(spi_device->gpio_cs, 0);
- /* Enable auto read */
- MCHP_SPI_CR(ctrl) |= BIT(5);
- dma_start_rx(opdma, rxlen, rxdata);
- MCHP_SPI_TD(ctrl) = 0;
- ret = EC_SUCCESS;
- }
- }
-
- return ret;
-}
-
-int gpspi_transaction_flush(const struct spi_device_t *spi_device)
-{
- int ctrl, hw_port;
- int ret;
- enum dma_channel chan;
- const struct dma_option *opdma;
- timestamp_t deadline;
-
- if (spi_device == NULL)
- return EC_ERROR_PARAM1;
-
- hw_port = spi_device->port;
- ctrl = gpspi_port_to_ctrl_id(hw_port);
- opdma = spi_dma_option(spi_device, SPI_DMA_OPTION_RD);
- chan = opdma->channel;
-
- ret = dma_wait(chan);
-
- /* Disable auto read */
- MCHP_SPI_CR(ctrl) &= ~BIT(5);
-
- deadline.val = get_time().val + SPI_BYTE_TRANSFER_TIMEOUT_US;
- /* Wait for FIFO empty SPISR_TXBE */
- while ((MCHP_SPI_SR(ctrl) & 0x01) != 0x1) {
- if (timestamp_expired(deadline, NULL)) {
- ret = EC_ERROR_TIMEOUT;
- break;
- }
- usleep(SPI_BYTE_TRANSFER_POLL_INTERVAL_US);
- }
-
- dma_disable(chan);
- dma_clear_isr(chan);
- if (MCHP_SPI_SR(ctrl) & 0x2)
- hw_port = MCHP_SPI_RD(ctrl);
-
- gpio_set_level(spi_device->gpio_cs, 1);
-
- return ret;
-}
-
-int gpspi_transaction_wait(const struct spi_device_t *spi_device)
-{
- const struct dma_option *opdma;
-
- opdma = spi_dma_option(spi_device, SPI_DMA_OPTION_RD);
-
- return dma_wait(opdma->channel);
-}
-
-/**
- * Enable GPSPI controller and MODULE_SPI_CONTROLLER pins
- *
- * @param hw_port b[7:4]=1 b[3:0]=0(GPSPI0), 1(GPSPI1)
- * @param enable
- * @return EC_SUCCESS or EC_ERROR_INVAL if port is unrecognized
- * @note called from mec1701/spi.c
- *
- */
-int gpspi_enable(int hw_port, int enable)
-{
- uint32_t ctrl;
-
- if ((hw_port != GPSPI0_PORT) && (hw_port != GPSPI1_PORT))
- return EC_ERROR_INVAL;
-
- gpio_config_module(MODULE_SPI_CONTROLLER, (enable > 0));
-
- ctrl = (uint32_t)hw_port & 0x0f;
-
- if (enable) {
-
- if (ctrl)
- MCHP_PCR_SLP_DIS_DEV(MCHP_PCR_GPSPI1);
- else
- MCHP_PCR_SLP_DIS_DEV(MCHP_PCR_GPSPI0);
-
- /* Set enable bit in SPI_AR */
- MCHP_SPI_AR(ctrl) |= 0x1;
-
- /* Set SPDIN to 0 -> Full duplex */
- MCHP_SPI_CR(ctrl) &= ~(0x3 << 2);
-
- /* Set CLKPOL, TCLKPH, RCLKPH to 0 */
- MCHP_SPI_CC(ctrl) &= ~0x7;
-
- /* Set LSBF to 0 -> MSB first */
- MCHP_SPI_CR(ctrl) &= ~0x1;
- } else {
- /* soft reset */
- MCHP_SPI_CR(ctrl) |= (1u << 4);
-
- /* Clear enable bit in SPI_AR */
- MCHP_SPI_AR(ctrl) &= ~0x1;
-
- if (ctrl)
- MCHP_PCR_SLP_EN_DEV(MCHP_PCR_GPSPI1);
- else
- MCHP_PCR_SLP_EN_DEV(MCHP_PCR_GPSPI0);
- }
-
- return EC_SUCCESS;
-}
-
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