powerpc, 8xx: move SPI driver to drivers/spi/

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

1 files changed, 336 insertions, 0 deletions

diff --git a/drivers/spi/mpc8xx_spi.c b/drivers/spi/mpc8xx_spi.c
new file mode 100644
index 0000000000..b5bd558526
--- /dev/null
+++ b/drivers/spi/mpc8xx_spi.c
@@ -0,0 +1,336 @@
+/*
+ * Copyright (c) 2001 Navin Boppuri / Prashant Patel
+ *	<nboppuri@trinetcommunication.com>,
+ *	<pmpatel@trinetcommunication.com>
+ * Copyright (c) 2001 Gerd Mennchen <Gerd.Mennchen@icn.siemens.de>
+ * Copyright (c) 2001 Wolfgang Denk, DENX Software Engineering, <wd@denx.de>.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * MPC8xx CPM SPI interface.
+ *
+ * Parts of this code are probably not portable and/or specific to
+ * the board which I used for the tests. Please send fixes/complaints
+ * to wd@denx.de
+ *
+ */
+
+#include <common.h>
+#include <mpc8xx.h>
+#include <commproc.h>
+#include <linux/ctype.h>
+#include <malloc.h>
+#include <post.h>
+#include <serial.h>
+
+#define SPI_EEPROM_WREN		0x06
+#define SPI_EEPROM_RDSR		0x05
+#define SPI_EEPROM_READ		0x03
+#define SPI_EEPROM_WRITE	0x02
+
+/* ---------------------------------------------------------------
+ * Offset for initial SPI buffers in DPRAM:
+ * We need a 520 byte scratch DPRAM area to use at an early stage.
+ * It is used between the two initialization calls (spi_init_f()
+ * and spi_init_r()).
+ * The value 0xb00 makes it far enough from the start of the data
+ * area (as well as from the stack pointer).
+ * --------------------------------------------------------------- */
+#ifndef	CONFIG_SYS_SPI_INIT_OFFSET
+#define	CONFIG_SYS_SPI_INIT_OFFSET	0xB00
+#endif
+
+#define CPM_SPI_BASE_RX	CPM_SPI_BASE
+#define CPM_SPI_BASE_TX	(CPM_SPI_BASE + sizeof(cbd_t))
+
+/* -------------------
+ * Function prototypes
+ * ------------------- */
+ssize_t spi_xfer(size_t);
+
+/* -------------------
+ * Variables
+ * ------------------- */
+
+#define MAX_BUFFER	0x104
+
+/* ----------------------------------------------------------------------
+ * Initially we place the RX and TX buffers at a fixed location in DPRAM!
+ * ---------------------------------------------------------------------- */
+static uchar *rxbuf =
+	(uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem
+			[CONFIG_SYS_SPI_INIT_OFFSET];
+static uchar *txbuf =
+	(uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem
+			[CONFIG_SYS_SPI_INIT_OFFSET+MAX_BUFFER];
+
+/* **************************************************************************
+ *
+ *  Function:    spi_init_f
+ *
+ *  Description: Init SPI-Controller (ROM part)
+ *
+ *  return:      ---
+ *
+ * *********************************************************************** */
+void spi_init_f(void)
+{
+	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
+	cpm8xx_t __iomem *cp = &immr->im_cpm;
+	spi_t __iomem *spi = (spi_t __iomem *)&cp->cp_dparam[PROFF_SPI];
+	cbd_t __iomem *tbdf, *rbdf;
+
+	/* Disable relocation */
+	out_be16(&spi->spi_rpbase, 0);
+
+/* 1 */
+	/* ------------------------------------------------
+	 * Initialize Port B SPI pins -> page 34-8 MPC860UM
+	 * (we are only in Master Mode !)
+	 * ------------------------------------------------ */
+
+	/* --------------------------------------------
+	 * GPIO or per. Function
+	 * PBPAR[28] = 1 [0x00000008] -> PERI: (SPIMISO)
+	 * PBPAR[29] = 1 [0x00000004] -> PERI: (SPIMOSI)
+	 * PBPAR[30] = 1 [0x00000002] -> PERI: (SPICLK)
+	 * PBPAR[31] = 0 [0x00000001] -> GPIO: (CS for PCUE/CCM-EEPROM)
+	 * -------------------------------------------- */
+	clrsetbits_be32(&cp->cp_pbpar, 0x00000001, 0x0000000E);	/* set  bits */
+
+	/* ----------------------------------------------
+	 * In/Out or per. Function 0/1
+	 * PBDIR[28] = 1 [0x00000008] -> PERI1: SPIMISO
+	 * PBDIR[29] = 1 [0x00000004] -> PERI1: SPIMOSI
+	 * PBDIR[30] = 1 [0x00000002] -> PERI1: SPICLK
+	 * PBDIR[31] = 1 [0x00000001] -> GPIO OUT: CS for PCUE/CCM-EEPROM
+	 * ---------------------------------------------- */
+	setbits_be32(&cp->cp_pbdir, 0x0000000F);
+
+	/* ----------------------------------------------
+	 * open drain or active output
+	 * PBODR[28] = 1 [0x00000008] -> open drain: SPIMISO
+	 * PBODR[29] = 0 [0x00000004] -> active output SPIMOSI
+	 * PBODR[30] = 0 [0x00000002] -> active output: SPICLK
+	 * PBODR[31] = 0 [0x00000001] -> active output GPIO OUT: CS for PCUE/CCM
+	 * ---------------------------------------------- */
+
+	clrsetbits_be16(&cp->cp_pbodr, 0x00000007, 0x00000008);
+
+	/* Initialize the parameter ram.
+	 * We need to make sure many things are initialized to zero
+	 */
+	out_be32(&spi->spi_rstate, 0);
+	out_be32(&spi->spi_rdp, 0);
+	out_be16(&spi->spi_rbptr, 0);
+	out_be16(&spi->spi_rbc, 0);
+	out_be32(&spi->spi_rxtmp, 0);
+	out_be32(&spi->spi_tstate, 0);
+	out_be32(&spi->spi_tdp, 0);
+	out_be16(&spi->spi_tbptr, 0);
+	out_be16(&spi->spi_tbc, 0);
+	out_be32(&spi->spi_txtmp, 0);
+
+/* 3 */
+	/* Set up the SPI parameters in the parameter ram */
+	out_be16(&spi->spi_rbase, CPM_SPI_BASE_RX);
+	out_be16(&spi->spi_tbase, CPM_SPI_BASE_TX);
+
+	/***********IMPORTANT******************/
+
+	/*
+	 * Setting transmit and receive buffer descriptor pointers
+	 * initially to rbase and tbase. Only the microcode patches
+	 * documentation talks about initializing this pointer. This
+	 * is missing from the sample I2C driver. If you dont
+	 * initialize these pointers, the kernel hangs.
+	 */
+	out_be16(&spi->spi_rbptr, CPM_SPI_BASE_RX);
+	out_be16(&spi->spi_tbptr, CPM_SPI_BASE_TX);
+
+/* 4 */
+	/* Init SPI Tx + Rx Parameters */
+	while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG)
+		;
+
+	out_be16(&cp->cp_cpcr, mk_cr_cmd(CPM_CR_CH_SPI, CPM_CR_INIT_TRX) |
+			       CPM_CR_FLG);
+	while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG)
+		;
+
+/* 5 */
+	/* Set SDMA configuration register */
+	out_be32(&immr->im_siu_conf.sc_sdcr, 0x0001);
+
+/* 6 */
+	/* Set to big endian. */
+	out_8(&spi->spi_tfcr, SMC_EB);
+	out_8(&spi->spi_rfcr, SMC_EB);
+
+/* 7 */
+	/* Set maximum receive size. */
+	out_be16(&spi->spi_mrblr, MAX_BUFFER);
+
+/* 8 + 9 */
+	/* tx and rx buffer descriptors */
+	tbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_TX];
+	rbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_RX];
+
+	clrbits_be16(&tbdf->cbd_sc, BD_SC_READY);
+	clrbits_be16(&rbdf->cbd_sc, BD_SC_EMPTY);
+
+	/* Set the bd's rx and tx buffer address pointers */
+	out_be32(&rbdf->cbd_bufaddr, (ulong)rxbuf);
+	out_be32(&tbdf->cbd_bufaddr, (ulong)txbuf);
+
+/* 10 + 11 */
+	out_8(&cp->cp_spim, 0);			/* Mask  all SPI events */
+	out_8(&cp->cp_spie, SPI_EMASK);		/* Clear all SPI events	*/
+
+	return;
+}
+
+/* **************************************************************************
+ *
+ *  Function:    spi_init_r
+ *
+ *  Description: Init SPI-Controller (RAM part) -
+ *		 The malloc engine is ready and we can move our buffers to
+ *		 normal RAM
+ *
+ *  return:      ---
+ *
+ * *********************************************************************** */
+void spi_init_r(void)
+{
+	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
+	cpm8xx_t __iomem *cp = &immr->im_cpm;
+	spi_t __iomem *spi = (spi_t __iomem *)&cp->cp_dparam[PROFF_SPI];
+	cbd_t __iomem *tbdf, *rbdf;
+
+	/* Disable relocation */
+	out_be16(&spi->spi_rpbase, 0);
+
+	/* tx and rx buffer descriptors */
+	tbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_TX];
+	rbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_RX];
+
+	/* Allocate memory for RX and TX buffers */
+	rxbuf = (uchar *)malloc(MAX_BUFFER);
+	txbuf = (uchar *)malloc(MAX_BUFFER);
+
+	out_be32(&rbdf->cbd_bufaddr, (ulong)rxbuf);
+	out_be32(&tbdf->cbd_bufaddr, (ulong)txbuf);
+
+	return;
+}
+
+/****************************************************************************
+ *  Function:    spi_write
+ **************************************************************************** */
+ssize_t spi_write(uchar *addr, int alen, uchar *buffer, int len)
+{
+	int i;
+
+	memset(rxbuf, 0, MAX_BUFFER);
+	memset(txbuf, 0, MAX_BUFFER);
+	*txbuf = SPI_EEPROM_WREN;		/* write enable		*/
+	spi_xfer(1);
+	memcpy(txbuf, addr, alen);
+	*txbuf = SPI_EEPROM_WRITE;		/* WRITE memory array	*/
+	memcpy(alen + txbuf, buffer, len);
+	spi_xfer(alen + len);
+						/* ignore received data	*/
+	for (i = 0; i < 1000; i++) {
+		*txbuf = SPI_EEPROM_RDSR;	/* read status		*/
+		txbuf[1] = 0;
+		spi_xfer(2);
+		if (!(rxbuf[1] & 1))
+			break;
+		udelay(1000);
+	}
+	if (i >= 1000)
+		printf("*** spi_write: Time out while writing!\n");
+
+	return len;
+}
+
+/****************************************************************************
+ *  Function:    spi_read
+ **************************************************************************** */
+ssize_t spi_read(uchar *addr, int alen, uchar *buffer, int len)
+{
+	memset(rxbuf, 0, MAX_BUFFER);
+	memset(txbuf, 0, MAX_BUFFER);
+	memcpy(txbuf, addr, alen);
+	*txbuf = SPI_EEPROM_READ;		/* READ memory array	*/
+
+	/*
+	 * There is a bug in 860T (?) that cuts the last byte of input
+	 * if we're reading into DPRAM. The solution we choose here is
+	 * to always read len+1 bytes (we have one extra byte at the
+	 * end of the buffer).
+	 */
+	spi_xfer(alen + len + 1);
+	memcpy(buffer, alen + rxbuf, len);
+
+	return len;
+}
+
+/****************************************************************************
+ *  Function:    spi_xfer
+ **************************************************************************** */
+ssize_t spi_xfer(size_t count)
+{
+	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
+	cpm8xx_t __iomem *cp = &immr->im_cpm;
+	spi_t __iomem *spi = (spi_t __iomem *)&cp->cp_dparam[PROFF_SPI];
+	cbd_t __iomem *tbdf, *rbdf;
+	int tm;
+
+	/* Disable relocation */
+	out_be16(&spi->spi_rpbase, 0);
+
+	tbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_TX];
+	rbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_RX];
+
+	/* Set CS for device */
+	clrbits_be32(&cp->cp_pbdat, 0x0001);
+
+	/* Setting tx bd status and data length */
+	out_be16(&tbdf->cbd_sc, BD_SC_READY | BD_SC_LAST | BD_SC_WRAP);
+	out_be16(&tbdf->cbd_datlen, count);
+
+	/* Setting rx bd status and data length */
+	out_be16(&rbdf->cbd_sc, BD_SC_EMPTY | BD_SC_WRAP);
+	out_be16(&rbdf->cbd_datlen, 0);	 /* rx length has no significance */
+
+	clrsetbits_be16(&cp->cp_spmode, ~SPMODE_LOOP, SPMODE_REV | SPMODE_MSTR |
+			SPMODE_EN | SPMODE_LEN(8) | SPMODE_PM(0x8));
+	out_8(&cp->cp_spim, 0);		/* Mask  all SPI events */
+	out_8(&cp->cp_spie, SPI_EMASK);	/* Clear all SPI events	*/
+
+	/* start spi transfer */
+	setbits_8(&cp->cp_spcom, SPI_STR);		/* Start transmit */
+
+	/* --------------------------------
+	 * Wait for SPI transmit to get out
+	 * or time out (1 second = 1000 ms)
+	 * -------------------------------- */
+	for (tm = 0; tm < 1000; ++tm) {
+		if (in_8(&cp->cp_spie) & SPI_TXB)	/* Tx Buffer Empty */
+			break;
+		if ((in_be16(&tbdf->cbd_sc) & BD_SC_READY) == 0)
+			break;
+		udelay(1000);
+	}
+	if (tm >= 1000)
+		printf("*** spi_xfer: Time out while xferring to/from SPI!\n");
+
+	/* Clear CS for device */
+	setbits_be32(&cp->cp_pbdat, 0x0001);
+
+	return count;
+}