drivers/serial/cpm_uart/cpm_uart_cpm2.c

/*
 *  linux/drivers/serial/cpm_uart_cpm2.c
 *
 *  Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
 *
 *  Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
 *              Pantelis Antoniou (panto@intracom.gr) (CPM1)
 * 
 *  Copyright (C) 2004 Freescale Semiconductor, Inc.
 *            (C) 2004 Intracom, S.A.
 *            (C) 2006 MontaVista Software, Inc.
 * 		Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/device.h>
#include <linux/bootmem.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/fs_pd.h>
#ifdef CONFIG_PPC_CPM_NEW_BINDING
#include <asm/prom.h>
#endif

#include <linux/serial_core.h>
#include <linux/kernel.h>

#include "cpm_uart.h"

/**************************************************************/

#ifdef CONFIG_PPC_CPM_NEW_BINDING
void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
{
	cpm_command(port->command, cmd);
}

void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
				struct device_node *np)
{
	void __iomem *pram;
	unsigned long offset;
	struct resource res;
	unsigned long len;

	/* Don't remap parameter RAM if it has already been initialized
	 * during console setup.
	 */
	if (IS_SMC(port) && port->smcup)
		return port->smcup;
	else if (!IS_SMC(port) && port->sccup)
		return port->sccup;

	if (of_address_to_resource(np, 1, &res))
		return NULL;

	len = 1 + res.end - res.start;
	pram = ioremap(res.start, len);
	if (!pram)
		return NULL;

	if (!IS_SMC(port))
		return pram;

	if (len != 2) {
		printk(KERN_WARNING "cpm_uart[%d]: device tree references "
			"SMC pram, using boot loader/wrapper pram mapping. "
			"Please fix your device tree to reference the pram "
			"base register instead.\n",
			port->port.line);
		return pram;
	}

	offset = cpm_dpalloc(PROFF_SMC_SIZE, 64);
	out_be16(pram, offset);
	iounmap(pram);
	return cpm_muram_addr(offset);
}

void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
{
	if (!IS_SMC(port))
		iounmap(pram);
}

#else
void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
{
	ulong val;
	int line = port - cpm_uart_ports;
	volatile cpm_cpm2_t *cp = cpm2_map(im_cpm);


	switch (line) {
	case UART_SMC1:
		val = mk_cr_cmd(CPM_CR_SMC1_PAGE, CPM_CR_SMC1_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SMC2:
		val = mk_cr_cmd(CPM_CR_SMC2_PAGE, CPM_CR_SMC2_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SCC1:
		val = mk_cr_cmd(CPM_CR_SCC1_PAGE, CPM_CR_SCC1_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SCC2:
		val = mk_cr_cmd(CPM_CR_SCC2_PAGE, CPM_CR_SCC2_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SCC3:
		val = mk_cr_cmd(CPM_CR_SCC3_PAGE, CPM_CR_SCC3_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SCC4:
		val = mk_cr_cmd(CPM_CR_SCC4_PAGE, CPM_CR_SCC4_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	default:
		return;

	}
	cp->cp_cpcr = val;
	while (cp->cp_cpcr & CPM_CR_FLG) ;

	cpm2_unmap(cp);
}

void smc1_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);

	/* SMC1 is only on port D */
	io->iop_ppard |= 0x00c00000;
	io->iop_pdird |= 0x00400000;
	io->iop_pdird &= ~0x00800000;
	io->iop_psord &= ~0x00c00000;

	/* Wire BRG1 to SMC1 */
	cpmux->cmx_smr &= 0x0f;
	pinfo->brg = 1;

	cpm2_unmap(cpmux);
	cpm2_unmap(io);
}

void smc2_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);

	/* SMC2 is only on port A */
	io->iop_ppara |= 0x00c00000;
	io->iop_pdira |= 0x00400000;
	io->iop_pdira &= ~0x00800000;
	io->iop_psora &= ~0x00c00000;

	/* Wire BRG2 to SMC2 */
	cpmux->cmx_smr &= 0xf0;
	pinfo->brg = 2;

	cpm2_unmap(cpmux);
	cpm2_unmap(io);
}

void scc1_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);

	/* Use Port D for SCC1 instead of other functions.  */
	io->iop_ppard |= 0x00000003;
	io->iop_psord &= ~0x00000001;	/* Rx */
	io->iop_psord |= 0x00000002;	/* Tx */
	io->iop_pdird &= ~0x00000001;	/* Rx */
	io->iop_pdird |= 0x00000002;	/* Tx */

	/* Wire BRG1 to SCC1 */
	cpmux->cmx_scr &= 0x00ffffff;
	cpmux->cmx_scr |= 0x00000000;
	pinfo->brg = 1;

	cpm2_unmap(cpmux);
	cpm2_unmap(io);
}

void scc2_lineif(struct uart_cpm_port *pinfo)
{
	/*
	 * STx GP3 uses the SCC2 secondary option pin assignment
	 * which this driver doesn't account for in the static
	 * pin assignments. This kind of board specific info
	 * really has to get out of the driver so boards can
	 * be supported in a sane fashion.
	 */
	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
#ifndef CONFIG_STX_GP3
	volatile iop_cpm2_t *io = cpm2_map(im_ioport);

	io->iop_pparb |= 0x008b0000;
	io->iop_pdirb |= 0x00880000;
	io->iop_psorb |= 0x00880000;
	io->iop_pdirb &= ~0x00030000;
	io->iop_psorb &= ~0x00030000;
#endif
	cpmux->cmx_scr &= 0xff00ffff;
	cpmux->cmx_scr |= 0x00090000;
	pinfo->brg = 2;

	cpm2_unmap(cpmux);
	cpm2_unmap(io);
}

void scc3_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);

	io->iop_pparb |= 0x008b0000;
	io->iop_pdirb |= 0x00880000;
	io->iop_psorb |= 0x00880000;
	io->iop_pdirb &= ~0x00030000;
	io->iop_psorb &= ~0x00030000;
	cpmux->cmx_scr &= 0xffff00ff;
	cpmux->cmx_scr |= 0x00001200;
	pinfo->brg = 3;

	cpm2_unmap(cpmux);
	cpm2_unmap(io);
}

void scc4_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);

	io->iop_ppard |= 0x00000600;
	io->iop_psord &= ~0x00000600;	/* Tx/Rx */
	io->iop_pdird &= ~0x00000200;	/* Rx */
	io->iop_pdird |= 0x00000400;	/* Tx */

	cpmux->cmx_scr &= 0xffffff00;
	cpmux->cmx_scr |= 0x0000001b;
	pinfo->brg = 4;

	cpm2_unmap(cpmux);
	cpm2_unmap(io);
}
#endif

/*
 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and 
 * receive buffer descriptors from dual port ram, and a character
 * buffer area from host mem. If we are allocating for the console we need
 * to do it from bootmem
 */
int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
{
	int dpmemsz, memsz;
	u8 __iomem *dp_mem;
	unsigned long dp_offset;
	u8 *mem_addr;
	dma_addr_t dma_addr = 0;

	pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);

	dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
	dp_offset = cpm_dpalloc(dpmemsz, 8);
	if (IS_ERR_VALUE(dp_offset)) {
		printk(KERN_ERR
		       "cpm_uart_cpm.c: could not allocate buffer descriptors\n");
		return -ENOMEM;
	}

	dp_mem = cpm_dpram_addr(dp_offset);

	memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
	    L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
	if (is_con) {
		mem_addr = alloc_bootmem(memsz);
		dma_addr = virt_to_bus(mem_addr);
	}
	else
		mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
					      GFP_KERNEL);

	if (mem_addr == NULL) {
		cpm_dpfree(dp_offset);
		printk(KERN_ERR
		       "cpm_uart_cpm.c: could not allocate coherent memory\n");
		return -ENOMEM;
	}

	pinfo->dp_addr = dp_offset;
	pinfo->mem_addr = mem_addr;
	pinfo->dma_addr = dma_addr;
	pinfo->mem_size = memsz;

	pinfo->rx_buf = mem_addr;
	pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
						       * pinfo->rx_fifosize);

	pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
	pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;

	return 0;
}

void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
{
	dma_free_coherent(NULL, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
					       pinfo->rx_fifosize) +
			  L1_CACHE_ALIGN(pinfo->tx_nrfifos *
					 pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
			  pinfo->dma_addr);

	cpm_dpfree(pinfo->dp_addr);
}

#ifndef CONFIG_PPC_CPM_NEW_BINDING
/* Setup any dynamic params in the uart desc */
int cpm_uart_init_portdesc(void)
{
#if defined(CONFIG_SERIAL_CPM_SMC1) || defined(CONFIG_SERIAL_CPM_SMC2)
	u16 *addr;
#endif
	pr_debug("CPM uart[-]:init portdesc\n");

	cpm_uart_nr = 0;
#ifdef CONFIG_SERIAL_CPM_SMC1
	cpm_uart_ports[UART_SMC1].smcp = (smc_t *) cpm2_map(im_smc[0]);
	cpm_uart_ports[UART_SMC1].port.mapbase =
	    (unsigned long)cpm_uart_ports[UART_SMC1].smcp;

	cpm_uart_ports[UART_SMC1].smcup =
	    (smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC1], PROFF_SMC_SIZE);
	addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC1_BASE], 2);
	*addr = PROFF_SMC1;
	cpm2_unmap(addr);

	cpm_uart_ports[UART_SMC1].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
	cpm_uart_ports[UART_SMC1].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
	cpm_uart_ports[UART_SMC1].port.uartclk = uart_clock();
	cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
#endif

#ifdef CONFIG_SERIAL_CPM_SMC2
	cpm_uart_ports[UART_SMC2].smcp = (smc_t *) cpm2_map(im_smc[1]);
	cpm_uart_ports[UART_SMC2].port.mapbase =
	    (unsigned long)cpm_uart_ports[UART_SMC2].smcp;

	cpm_uart_ports[UART_SMC2].smcup =
	    (smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC2], PROFF_SMC_SIZE);
	addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC2_BASE], 2);
	*addr = PROFF_SMC2;
	cpm2_unmap(addr);

	cpm_uart_ports[UART_SMC2].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
	cpm_uart_ports[UART_SMC2].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
	cpm_uart_ports[UART_SMC2].port.uartclk = uart_clock();
	cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
#endif

#ifdef CONFIG_SERIAL_CPM_SCC1
	cpm_uart_ports[UART_SCC1].sccp = (scc_t *) cpm2_map(im_scc[0]);
	cpm_uart_ports[UART_SCC1].port.mapbase =
	    (unsigned long)cpm_uart_ports[UART_SCC1].sccp;
	cpm_uart_ports[UART_SCC1].sccup =
	    (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC1], PROFF_SCC_SIZE);

	cpm_uart_ports[UART_SCC1].sccp->scc_sccm &=
	    ~(UART_SCCM_TX | UART_SCCM_RX);
	cpm_uart_ports[UART_SCC1].sccp->scc_gsmrl &=
	    ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
	cpm_uart_ports[UART_SCC1].port.uartclk = uart_clock();
	cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
#endif

#ifdef CONFIG_SERIAL_CPM_SCC2
	cpm_uart_ports[UART_SCC2].sccp = (scc_t *) cpm2_map(im_scc[1]);
	cpm_uart_ports[UART_SCC2].port.mapbase =
	    (unsigned long)cpm_uart_ports[UART_SCC2].sccp;
	cpm_uart_ports[UART_SCC2].sccup =
	    (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC2], PROFF_SCC_SIZE);

	cpm_uart_ports[UART_SCC2].sccp->scc_sccm &=
	    ~(UART_SCCM_TX | UART_SCCM_RX);
	cpm_uart_ports[UART_SCC2].sccp->scc_gsmrl &=
	    ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
	cpm_uart_ports[UART_SCC2].port.uartclk = uart_clock();
	cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
#endif

#ifdef CONFIG_SERIAL_CPM_SCC3
	cpm_uart_ports[UART_SCC3].sccp = (scc_t *) cpm2_map(im_scc[2]);
	cpm_uart_ports[UART_SCC3].port.mapbase =
	    (unsigned long)cpm_uart_ports[UART_SCC3].sccp;
	cpm_uart_ports[UART_SCC3].sccup =
	    (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC3], PROFF_SCC_SIZE);

	cpm_uart_ports[UART_SCC3].sccp->scc_sccm &=
	    ~(UART_SCCM_TX | UART_SCCM_RX);
	cpm_uart_ports[UART_SCC3].sccp->scc_gsmrl &=
	    ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
	cpm_uart_ports[UART_SCC3].port.uartclk = uart_clock();
	cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
#endif

#ifdef CONFIG_SERIAL_CPM_SCC4
	cpm_uart_ports[UART_SCC4].sccp = (scc_t *) cpm2_map(im_scc[3]);
	cpm_uart_ports[UART_SCC4].port.mapbase =
	    (unsigned long)cpm_uart_ports[UART_SCC4].sccp;
	cpm_uart_ports[UART_SCC4].sccup =
	    (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC4], PROFF_SCC_SIZE);

	cpm_uart_ports[UART_SCC4].sccp->scc_sccm &=
	    ~(UART_SCCM_TX | UART_SCCM_RX);
	cpm_uart_ports[UART_SCC4].sccp->scc_gsmrl &=
	    ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
	cpm_uart_ports[UART_SCC4].port.uartclk = uart_clock();
	cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
#endif

	return 0;
}
#endif