[net-next-2.6.git] / 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/slab.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>
#include <asm/prom.h>

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

#include "cpm_uart.h"

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

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;
	resource_size_t 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 = resource_size(&res);
	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);
}

/*
 * 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 = kzalloc(memsz, GFP_NOWAIT);
		dma_addr = virt_to_bus(mem_addr);
	}
	else
		mem_addr = dma_alloc_coherent(pinfo->port.dev, 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(pinfo->port.dev, 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);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/serial/cpm_uart_cpm2.c
	3	*
	4	* Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
	5	*
4c8d3d99	6	* Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
1da177e4	7	* Pantelis Antoniou (panto@intracom.gr) (CPM1)
0d844065	8	*
1da177e4 LT	9	* Copyright (C) 2004 Freescale Semiconductor, Inc.
1da177e4 LT	10	* (C) 2004 Intracom, S.A.
6e197696	11	* (C) 2006 MontaVista Software, Inc.
0d844065	12	* Vitaly Bordug <vbordug@ru.mvista.com>
1da177e4 LT	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, write to the Free Software
	26	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	27	*
	28	*/
	29
1da177e4 LT	30	#include <linux/module.h>
	31	#include <linux/tty.h>
	32	#include <linux/ioport.h>
5a0e3ad6	33	#include <linux/slab.h>
1da177e4 LT	34	#include <linux/init.h>
	35	#include <linux/serial.h>
	36	#include <linux/console.h>
	37	#include <linux/sysrq.h>
	38	#include <linux/device.h>
	39	#include <linux/bootmem.h>
	40	#include <linux/dma-mapping.h>
	41
	42	#include <asm/io.h>
	43	#include <asm/irq.h>
3dd0dcbe	44	#include <asm/fs_pd.h>
d464df26	45	#include <asm/prom.h>
1da177e4 LT	46
	47	#include <linux/serial_core.h>
	48	#include <linux/kernel.h>
	49
	50	#include "cpm_uart.h"
	51
	52	/**************************************************************/
	53
7ae87036 SW	54	void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
7ae87036 SW	55	{
362f9b6f	56	cpm_command(port->command, cmd);
7ae87036	57	}
d464df26 LP	58
	59	void __iomem cpm_uart_map_pram(struct uart_cpm_port port,
	60	struct device_node *np)
	61	{
	62	void __iomem *pram;
	63	unsigned long offset;
	64	struct resource res;
23144366	65	resource_size_t len;
d464df26 LP	66
	67	/* Don't remap parameter RAM if it has already been initialized
	68	* during console setup.
	69	*/
	70	if (IS_SMC(port) && port->smcup)
	71	return port->smcup;
	72	else if (!IS_SMC(port) && port->sccup)
	73	return port->sccup;
	74
	75	if (of_address_to_resource(np, 1, &res))
	76	return NULL;
	77
23144366	78	len = resource_size(&res);
d464df26 LP	79	pram = ioremap(res.start, len);
	80	if (!pram)
	81	return NULL;
	82
	83	if (!IS_SMC(port))
	84	return pram;
	85
	86	if (len != 2) {
	87	printk(KERN_WARNING "cpm_uart[%d]: device tree references "
	88	"SMC pram, using boot loader/wrapper pram mapping. "
	89	"Please fix your device tree to reference the pram "
	90	"base register instead.\n",
	91	port->port.line);
	92	return pram;
	93	}
	94
	95	offset = cpm_dpalloc(PROFF_SMC_SIZE, 64);
	96	out_be16(pram, offset);
	97	iounmap(pram);
	98	return cpm_muram_addr(offset);
	99	}
	100
	101	void cpm_uart_unmap_pram(struct uart_cpm_port port, void __iomem pram)
	102	{
	103	if (!IS_SMC(port))
	104	iounmap(pram);
	105	}
	106
1da177e4	107	/*
0d844065	108	* Allocate DP-Ram and memory buffers. We need to allocate a transmit and
1da177e4 LT	109	* receive buffer descriptors from dual port ram, and a character
	110	* buffer area from host mem. If we are allocating for the console we need
	111	* to do it from bootmem
	112	*/
	113	int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
	114	{
	115	int dpmemsz, memsz;
15f8c604	116	u8 __iomem *dp_mem;
4c35630c	117	unsigned long dp_offset;
1da177e4 LT	118	u8 *mem_addr;
	119	dma_addr_t dma_addr = 0;
	120
	121	pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
	122
	123	dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
	124	dp_offset = cpm_dpalloc(dpmemsz, 8);
4c35630c	125	if (IS_ERR_VALUE(dp_offset)) {
1da177e4 LT	126	printk(KERN_ERR
	127	"cpm_uart_cpm.c: could not allocate buffer descriptors\n");
	128	return -ENOMEM;
	129	}
	130
	131	dp_mem = cpm_dpram_addr(dp_offset);
	132
	133	memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
	134	L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
09b03b6c	135	if (is_con) {
6e900de3	136	mem_addr = kzalloc(memsz, GFP_NOWAIT);
8e30a9a2	137	dma_addr = virt_to_bus(mem_addr);
09b03b6c	138	}
1da177e4	139	else
8b05cefc	140	mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
1da177e4 LT	141	GFP_KERNEL);
	142
	143	if (mem_addr == NULL) {
	144	cpm_dpfree(dp_offset);
	145	printk(KERN_ERR
	146	"cpm_uart_cpm.c: could not allocate coherent memory\n");
	147	return -ENOMEM;
	148	}
	149
	150	pinfo->dp_addr = dp_offset;
	151	pinfo->mem_addr = mem_addr;
	152	pinfo->dma_addr = dma_addr;
09b03b6c	153	pinfo->mem_size = memsz;
1da177e4 LT	154
	155	pinfo->rx_buf = mem_addr;
	156	pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
	157	* pinfo->rx_fifosize);
	158
15f8c604	159	pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
1da177e4 LT	160	pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
	161
	162	return 0;
	163	}
	164
	165	void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
	166	{
8b05cefc BB	167	dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
8b05cefc BB	168	pinfo->rx_fifosize) +
1da177e4	169	L1_CACHE_ALIGN(pinfo->tx_nrfifos *
c1dcfd9d	170	pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
1da177e4 LT	171	pinfo->dma_addr);
	172
	173	cpm_dpfree(pinfo->dp_addr);
	174	}