[mirror_ubuntu-jammy-kernel.git] / drivers / media / pci / mantis / mantis_uart.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
	Mantis PCI bridge driver

	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

*/

#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <asm/io.h>

#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/pci.h>

#include <media/dmxdev.h>
#include <media/dvbdev.h>
#include <media/dvb_demux.h>
#include <media/dvb_frontend.h>
#include <media/dvb_net.h>

#include "mantis_common.h"
#include "mantis_reg.h"
#include "mantis_uart.h"
#include "mantis_input.h"

struct mantis_uart_params {
	enum mantis_baud	baud_rate;
	enum mantis_parity	parity;
};

static struct {
	char string[7];
} rates[5] = {
	{ "9600" },
	{ "19200" },
	{ "38400" },
	{ "57600" },
	{ "115200" }
};

static struct {
	char string[5];
} parity[3] = {
	{ "NONE" },
	{ "ODD" },
	{ "EVEN" }
};

static void mantis_uart_read(struct mantis_pci *mantis)
{
	struct mantis_hwconfig *config = mantis->hwconfig;
	int i, scancode = 0, err = 0;

	/* get data */
	dprintk(MANTIS_DEBUG, 1, "UART Reading ...");
	for (i = 0; i < (config->bytes + 1); i++) {
		int data = mmread(MANTIS_UART_RXD);

		dprintk(MANTIS_DEBUG, 0, " <%02x>", data);

		scancode = (scancode << 8) | (data & 0x3f);
		err |= data;

		if (data & (1 << 7))
			dprintk(MANTIS_ERROR, 1, "UART framing error");

		if (data & (1 << 6))
			dprintk(MANTIS_ERROR, 1, "UART parity error");
	}
	dprintk(MANTIS_DEBUG, 0, "\n");

	if ((err & 0xC0) == 0)
		mantis_input_process(mantis, scancode);
}

static void mantis_uart_work(struct work_struct *work)
{
	struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work);
	u32 stat;
	unsigned long timeout;

	stat = mmread(MANTIS_UART_STAT);

	if (stat & MANTIS_UART_RXFIFO_FULL)
		dprintk(MANTIS_ERROR, 1, "RX Fifo FULL");

	/*
	 * MANTIS_UART_RXFIFO_DATA is only set if at least
	 * config->bytes + 1 bytes are in the FIFO.
	 */

	/* FIXME: is 10ms good enough ? */
	timeout = jiffies +  msecs_to_jiffies(10);
	while (stat & MANTIS_UART_RXFIFO_DATA) {
		mantis_uart_read(mantis);
		stat = mmread(MANTIS_UART_STAT);

		if (!time_is_after_jiffies(timeout))
			break;
	}

	/* re-enable UART (RX) interrupt */
	mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
}

static int mantis_uart_setup(struct mantis_pci *mantis,
			     struct mantis_uart_params *params)
{
	u32 reg;

	mmwrite((mmread(MANTIS_UART_CTL) | (params->parity & 0x3)), MANTIS_UART_CTL);

	reg = mmread(MANTIS_UART_BAUD);

	switch (params->baud_rate) {
	case MANTIS_BAUD_9600:
		reg |= 0xd8;
		break;
	case MANTIS_BAUD_19200:
		reg |= 0x6c;
		break;
	case MANTIS_BAUD_38400:
		reg |= 0x36;
		break;
	case MANTIS_BAUD_57600:
		reg |= 0x23;
		break;
	case MANTIS_BAUD_115200:
		reg |= 0x11;
		break;
	default:
		return -EINVAL;
	}

	mmwrite(reg, MANTIS_UART_BAUD);

	return 0;
}

int mantis_uart_init(struct mantis_pci *mantis)
{
	struct mantis_hwconfig *config = mantis->hwconfig;
	struct mantis_uart_params params;

	/* default parity: */
	params.baud_rate = config->baud_rate;
	params.parity = config->parity;
	dprintk(MANTIS_INFO, 1, "Initializing UART @ %sbps parity:%s",
		rates[params.baud_rate].string,
		parity[params.parity].string);

	INIT_WORK(&mantis->uart_work, mantis_uart_work);

	/* disable interrupt */
	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);

	mantis_uart_setup(mantis, &params);

	/* default 1 byte */
	mmwrite((mmread(MANTIS_UART_BAUD) | (config->bytes << 8)), MANTIS_UART_BAUD);

	/* flush buffer */
	mmwrite((mmread(MANTIS_UART_CTL) | MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);

	/* enable interrupt */
	mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL);
	mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);

	schedule_work(&mantis->uart_work);
	dprintk(MANTIS_DEBUG, 1, "UART successfully initialized");

	return 0;
}
EXPORT_SYMBOL_GPL(mantis_uart_init);

void mantis_uart_exit(struct mantis_pci *mantis)
{
	/* disable interrupt */
	mantis_mask_ints(mantis, MANTIS_INT_IRQ1);
	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
	flush_work(&mantis->uart_work);
}
EXPORT_SYMBOL_GPL(mantis_uart_exit);
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
a1497357 MA	2	/*
	3	Mantis PCI bridge driver
	4
	5	Copyright (C) Manu Abraham (abraham.manu@gmail.com)
	6
a1497357 MA	7	*/
a1497357 MA	8
b3b96144	9	#include <linux/kernel.h>
add20636	10	#include <linux/spinlock.h>
b7f080cf	11	#include <asm/io.h>
b3b96144	12
b3b96144 MA	13	#include <linux/signal.h>
	14	#include <linux/sched.h>
	15	#include <linux/interrupt.h>
a96762da	16	#include <linux/pci.h>
b3b96144	17
fada1935 MCC	18	#include <media/dmxdev.h>
	19	#include <media/dvbdev.h>
	20	#include <media/dvb_demux.h>
	21	#include <media/dvb_frontend.h>
	22	#include <media/dvb_net.h>
b3b96144	23
add20636	24	#include "mantis_common.h"
b3b96144 MA	25	#include "mantis_reg.h"
b3b96144 MA	26	#include "mantis_uart.h"
a96762da	27	#include "mantis_input.h"
add20636 MA	28
	29	struct mantis_uart_params {
	30	enum mantis_baud baud_rate;
	31	enum mantis_parity parity;
	32	};
	33
a1497357 MA	34	static struct {
	35	char string[7];
	36	} rates[5] = {
	37	{ "9600" },
	38	{ "19200" },
	39	{ "38400" },
	40	{ "57600" },
	41	{ "115200" }
	42	};
	43
	44	static struct {
	45	char string[5];
	46	} parity[3] = {
	47	{ "NONE" },
	48	{ "ODD" },
	49	{ "EVEN" }
	50	};
	51
a96762da	52	static void mantis_uart_read(struct mantis_pci *mantis)
add20636 MA	53	{
add20636 MA	54	struct mantis_hwconfig *config = mantis->hwconfig;
a96762da	55	int i, scancode = 0, err = 0;
add20636 MA	56
add20636 MA	57	/* get data */
a96762da	58	dprintk(MANTIS_DEBUG, 1, "UART Reading ...");
add20636	59	for (i = 0; i < (config->bytes + 1); i++) {
a96762da	60	int data = mmread(MANTIS_UART_RXD);
9d605e63	61
a96762da	62	dprintk(MANTIS_DEBUG, 0, " <%02x>", data);
add20636	63
a96762da JK	64	scancode = (scancode << 8) \| (data & 0x3f);
a96762da JK	65	err \|= data;
add20636	66
a96762da	67	if (data & (1 << 7))
b3b96144	68	dprintk(MANTIS_ERROR, 1, "UART framing error");
a96762da JK	69
a96762da JK	70	if (data & (1 << 6))
b3b96144	71	dprintk(MANTIS_ERROR, 1, "UART parity error");
add20636	72	}
a96762da	73	dprintk(MANTIS_DEBUG, 0, "\n");
add20636	74
a96762da JK	75	if ((err & 0xC0) == 0)
a96762da JK	76	mantis_input_process(mantis, scancode);
add20636 MA	77	}
	78
	79	static void mantis_uart_work(struct work_struct *work)
	80	{
	81	struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work);
a96762da	82	u32 stat;
cac61a1a	83	unsigned long timeout;
add20636	84
a96762da	85	stat = mmread(MANTIS_UART_STAT);
add20636	86
a96762da JK	87	if (stat & MANTIS_UART_RXFIFO_FULL)
a96762da JK	88	dprintk(MANTIS_ERROR, 1, "RX Fifo FULL");
add20636	89
a96762da	90	/*
9d605e63 MCC	91	* MANTIS_UART_RXFIFO_DATA is only set if at least
9d605e63 MCC	92	* config->bytes + 1 bytes are in the FIFO.
a96762da	93	*/
cac61a1a MCC	94
	95	/* FIXME: is 10ms good enough ? */
	96	timeout = jiffies + msecs_to_jiffies(10);
a96762da JK	97	while (stat & MANTIS_UART_RXFIFO_DATA) {
	98	mantis_uart_read(mantis);
	99	stat = mmread(MANTIS_UART_STAT);
cac61a1a MCC	100
	101	if (!time_is_after_jiffies(timeout))
	102	break;
a96762da JK	103	}
	104
	105	/* re-enable UART (RX) interrupt */
	106	mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
add20636 MA	107	}
	108
	109	static int mantis_uart_setup(struct mantis_pci *mantis,
	110	struct mantis_uart_params *params)
	111	{
add20636 MA	112	u32 reg;
add20636 MA	113
add20636 MA	114	mmwrite((mmread(MANTIS_UART_CTL) \| (params->parity & 0x3)), MANTIS_UART_CTL);
	115
	116	reg = mmread(MANTIS_UART_BAUD);
	117
	118	switch (params->baud_rate) {
	119	case MANTIS_BAUD_9600:
	120	reg \|= 0xd8;
	121	break;
	122	case MANTIS_BAUD_19200:
	123	reg \|= 0x6c;
	124	break;
	125	case MANTIS_BAUD_38400:
	126	reg \|= 0x36;
	127	break;
	128	case MANTIS_BAUD_57600:
	129	reg \|= 0x23;
	130	break;
	131	case MANTIS_BAUD_115200:
	132	reg \|= 0x11;
	133	break;
	134	default:
	135	return -EINVAL;
	136	}
	137
	138	mmwrite(reg, MANTIS_UART_BAUD);
	139
	140	return 0;
	141	}
	142
	143	int mantis_uart_init(struct mantis_pci *mantis)
	144	{
	145	struct mantis_hwconfig *config = mantis->hwconfig;
	146	struct mantis_uart_params params;
	147
add20636 MA	148	/* default parity: */
	149	params.baud_rate = config->baud_rate;
	150	params.parity = config->parity;
a1497357 MA	151	dprintk(MANTIS_INFO, 1, "Initializing UART @ %sbps parity:%s",
	152	rates[params.baud_rate].string,
	153	parity[params.parity].string);
add20636	154
add20636 MA	155	INIT_WORK(&mantis->uart_work, mantis_uart_work);
	156
	157	/* disable interrupt */
	158	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
	159
	160	mantis_uart_setup(mantis, &params);
	161
	162	/* default 1 byte */
	163	mmwrite((mmread(MANTIS_UART_BAUD) \| (config->bytes << 8)), MANTIS_UART_BAUD);
	164
	165	/* flush buffer */
	166	mmwrite((mmread(MANTIS_UART_CTL) \| MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);
	167
	168	/* enable interrupt */
add20636	169	mmwrite(mmread(MANTIS_UART_CTL) \| MANTIS_UART_RXINT, MANTIS_UART_CTL);
a96762da	170	mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
add20636 MA	171
add20636 MA	172	schedule_work(&mantis->uart_work);
25985edc	173	dprintk(MANTIS_DEBUG, 1, "UART successfully initialized");
add20636 MA	174
	175	return 0;
	176	}
b3b96144	177	EXPORT_SYMBOL_GPL(mantis_uart_init);
add20636 MA	178
	179	void mantis_uart_exit(struct mantis_pci *mantis)
	180	{
	181	/* disable interrupt */
a96762da	182	mantis_mask_ints(mantis, MANTIS_INT_IRQ1);
add20636	183	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
43829731	184	flush_work(&mantis->uart_work);
add20636	185	}
b3b96144	186	EXPORT_SYMBOL_GPL(mantis_uart_exit);