powerpc, 8xx: move Serial driver to drivers/serial/

At the same time, move to Kconfig

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

1 files changed, 256 insertions, 0 deletions

diff --git a/drivers/serial/serial_mpc8xx.c b/drivers/serial/serial_mpc8xx.c
new file mode 100644
index 0000000000..26a8085a69
--- /dev/null
+++ b/drivers/serial/serial_mpc8xx.c
@@ -0,0 +1,256 @@
+/*
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <commproc.h>
+#include <command.h>
+#include <serial.h>
+#include <watchdog.h>
+#include <linux/compiler.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if defined(CONFIG_8xx_CONS_SMC1)	/* Console on SMC1 */
+#define	SMC_INDEX	0
+#define PROFF_SMC	PROFF_SMC1
+#define CPM_CR_CH_SMC	CPM_CR_CH_SMC1
+#define IOPINS		0xc0
+
+#elif defined(CONFIG_8xx_CONS_SMC2)	/* Console on SMC2 */
+#define SMC_INDEX	1
+#define PROFF_SMC	PROFF_SMC2
+#define CPM_CR_CH_SMC	CPM_CR_CH_SMC2
+#define IOPINS		0xc00
+
+#endif /* CONFIG_8xx_CONS_SMCx */
+
+struct serialbuffer {
+	cbd_t	rxbd;		/* Rx BD */
+	cbd_t	txbd;		/* Tx BD */
+	uint	rxindex;	/* index for next character to read */
+	uchar	rxbuf[CONFIG_SYS_SMC_RXBUFLEN];/* rx buffers */
+	uchar	txbuf;	/* tx buffers */
+};
+
+static void serial_setdivisor(cpm8xx_t __iomem *cp)
+{
+	int divisor = (gd->cpu_clk + 8 * gd->baudrate) / 16 / gd->baudrate;
+
+	if (divisor / 16 > 0x1000) {
+		/* bad divisor, assume 50MHz clock and 9600 baud */
+		divisor = (50 * 1000 * 1000 + 8 * 9600) / 16 / 9600;
+	}
+
+	divisor /= CONFIG_SYS_BRGCLK_PRESCALE;
+
+	if (divisor <= 0x1000)
+		out_be32(&cp->cp_brgc1, ((divisor - 1) << 1) | CPM_BRG_EN);
+	else
+		out_be32(&cp->cp_brgc1, ((divisor / 16 - 1) << 1) | CPM_BRG_EN |
+			 CPM_BRG_DIV16);
+}
+
+/*
+ * Minimal serial functions needed to use one of the SMC ports
+ * as serial console interface.
+ */
+
+static void smc_setbrg(void)
+{
+	immap_t __iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
+	cpm8xx_t __iomem *cp = &(im->im_cpm);
+
+	/* Set up the baud rate generator.
+	 * See 8xx_io/commproc.c for details.
+	 *
+	 * Wire BRG1 to SMCx
+	 */
+
+	out_be32(&cp->cp_simode, 0);
+
+	serial_setdivisor(cp);
+}
+
+static int smc_init(void)
+{
+	immap_t __iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
+	smc_t __iomem *sp;
+	smc_uart_t __iomem *up;
+	cpm8xx_t __iomem *cp = &(im->im_cpm);
+	struct serialbuffer __iomem *rtx;
+
+	/* initialize pointers to SMC */
+
+	sp = cp->cp_smc + SMC_INDEX;
+	up = (smc_uart_t __iomem *)&cp->cp_dparam[PROFF_SMC];
+	/* Disable relocation */
+	out_be16(&up->smc_rpbase, 0);
+
+	/* Disable transmitter/receiver. */
+	clrbits_be16(&sp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+
+	/* Enable SDMA. */
+	out_be32(&im->im_siu_conf.sc_sdcr, 1);
+
+	/* clear error conditions */
+	out_8(&im->im_sdma.sdma_sdsr, CONFIG_SYS_SDSR);
+
+	/* clear SDMA interrupt mask */
+	out_8(&im->im_sdma.sdma_sdmr, CONFIG_SYS_SDMR);
+
+	/* Use Port B for SMCx instead of other functions. */
+	setbits_be32(&cp->cp_pbpar, IOPINS);
+	clrbits_be32(&cp->cp_pbdir, IOPINS);
+	clrbits_be16(&cp->cp_pbodr, IOPINS);
+
+	/* Set the physical address of the host memory buffers in
+	 * the buffer descriptors.
+	 */
+	rtx = (struct serialbuffer __iomem *)&cp->cp_dpmem[CPM_SERIAL_BASE];
+	/* Allocate space for two buffer descriptors in the DP ram.
+	 * For now, this address seems OK, but it may have to
+	 * change with newer versions of the firmware.
+	 * damm: allocating space after the two buffers for rx/tx data
+	 */
+
+	out_be32(&rtx->rxbd.cbd_bufaddr, (__force uint)&rtx->rxbuf);
+	out_be16(&rtx->rxbd.cbd_sc, 0);
+
+	out_be32(&rtx->txbd.cbd_bufaddr, (__force uint)&rtx->txbuf);
+	out_be16(&rtx->txbd.cbd_sc, 0);
+
+	/* Set up the uart parameters in the parameter ram. */
+	out_be16(&up->smc_rbase, CPM_SERIAL_BASE);
+	out_be16(&up->smc_tbase, CPM_SERIAL_BASE + sizeof(cbd_t));
+	out_8(&up->smc_rfcr, SMC_EB);
+	out_8(&up->smc_tfcr, SMC_EB);
+
+	/* Set UART mode, 8 bit, no parity, one stop.
+	 * Enable receive and transmit.
+	 */
+	out_be16(&sp->smc_smcmr, smcr_mk_clen(9) | SMCMR_SM_UART);
+
+	/* Mask all interrupts and remove anything pending.
+	*/
+	out_8(&sp->smc_smcm, 0);
+	out_8(&sp->smc_smce, 0xff);
+
+	/* Set up the baud rate generator */
+	smc_setbrg();
+
+	/* Make the first buffer the only buffer. */
+	setbits_be16(&rtx->txbd.cbd_sc, BD_SC_WRAP);
+	setbits_be16(&rtx->rxbd.cbd_sc, BD_SC_EMPTY | BD_SC_WRAP);
+
+	/* single/multi character receive. */
+	out_be16(&up->smc_mrblr, CONFIG_SYS_SMC_RXBUFLEN);
+	out_be16(&up->smc_maxidl, CONFIG_SYS_MAXIDLE);
+	out_be32(&rtx->rxindex, 0);
+
+	/* Initialize Tx/Rx parameters.	*/
+	while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG)	/* wait if cp is busy */
+		;
+
+	out_be16(&cp->cp_cpcr,
+		 mk_cr_cmd(CPM_CR_CH_SMC, CPM_CR_INIT_TRX) | CPM_CR_FLG);
+
+	while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG)	/* wait if cp is busy */
+		;
+
+	/* Enable transmitter/receiver.	*/
+	setbits_be16(&sp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+
+	return 0;
+}
+
+static void smc_putc(const char c)
+{
+	immap_t	__iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
+	cpm8xx_t	__iomem *cpmp = &(im->im_cpm);
+	struct serialbuffer	__iomem *rtx;
+
+	if (c == '\n')
+		smc_putc('\r');
+
+	rtx = (struct serialbuffer __iomem *)&cpmp->cp_dpmem[CPM_SERIAL_BASE];
+
+	/* Wait for last character to go. */
+	out_8(&rtx->txbuf, c);
+	out_be16(&rtx->txbd.cbd_datlen, 1);
+	setbits_be16(&rtx->txbd.cbd_sc, BD_SC_READY);
+
+	while (in_be16(&rtx->txbd.cbd_sc) & BD_SC_READY)
+		WATCHDOG_RESET();
+}
+
+static void smc_puts(const char *s)
+{
+	while (*s)
+		smc_putc(*s++);
+}
+
+static int smc_getc(void)
+{
+	immap_t	__iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
+	cpm8xx_t	__iomem *cpmp = &(im->im_cpm);
+	struct serialbuffer	__iomem *rtx;
+	unsigned char  c;
+	uint rxindex;
+
+	rtx = (struct serialbuffer __iomem *)&cpmp->cp_dpmem[CPM_SERIAL_BASE];
+
+	/* Wait for character to show up. */
+	while (in_be16(&rtx->rxbd.cbd_sc) & BD_SC_EMPTY)
+		WATCHDOG_RESET();
+
+	/* the characters are read one by one,
+	 * use the rxindex to know the next char to deliver
+	 */
+	rxindex = in_be32(&rtx->rxindex);
+	c = in_8(rtx->rxbuf + rxindex);
+	rxindex++;
+
+	/* check if all char are readout, then make prepare for next receive */
+	if (rxindex >= in_be16(&rtx->rxbd.cbd_datlen)) {
+		rxindex = 0;
+		setbits_be16(&rtx->rxbd.cbd_sc, BD_SC_EMPTY);
+	}
+	out_be32(&rtx->rxindex, rxindex);
+	return c;
+}
+
+static int smc_tstc(void)
+{
+	immap_t	__iomem *im = (immap_t __iomem *)CONFIG_SYS_IMMR;
+	cpm8xx_t	__iomem *cpmp = &(im->im_cpm);
+	struct serialbuffer	__iomem *rtx;
+
+	rtx = (struct serialbuffer __iomem *)&cpmp->cp_dpmem[CPM_SERIAL_BASE];
+
+	return !(in_be16(&rtx->rxbd.cbd_sc) & BD_SC_EMPTY);
+}
+
+struct serial_device serial_smc_device = {
+	.name	= "serial_smc",
+	.start	= smc_init,
+	.stop	= NULL,
+	.setbrg	= smc_setbrg,
+	.getc	= smc_getc,
+	.tstc	= smc_tstc,
+	.putc	= smc_putc,
+	.puts	= smc_puts,
+};
+
+__weak struct serial_device *default_serial_console(void)
+{
+	return &serial_smc_device;
+}
+
+void mpc8xx_serial_initialize(void)
+{
+	serial_register(&serial_smc_device);
+}