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/*
* ppi.c Analog Devices Parallel Peripheral Interface driver
*
* Copyright (c) 2011 Analog Devices Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <asm/bfin_ppi.h>
#include <asm/blackfin.h>
#include <asm/cacheflush.h>
#include <asm/dma.h>
#include <asm/portmux.h>
#include <media/blackfin/ppi.h>
static int ppi_attach_irq(struct ppi_if *ppi, irq_handler_t handler);
static void ppi_detach_irq(struct ppi_if *ppi);
static int ppi_start(struct ppi_if *ppi);
static int ppi_stop(struct ppi_if *ppi);
static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params);
static void ppi_update_addr(struct ppi_if *ppi, unsigned long addr);
static const struct ppi_ops ppi_ops = {
.attach_irq = ppi_attach_irq,
.detach_irq = ppi_detach_irq,
.start = ppi_start,
.stop = ppi_stop,
.set_params = ppi_set_params,
.update_addr = ppi_update_addr,
};
static irqreturn_t ppi_irq_err(int irq, void *dev_id)
{
struct ppi_if *ppi = dev_id;
const struct ppi_info *info = ppi->info;
switch (info->type) {
case PPI_TYPE_PPI:
{
struct bfin_ppi_regs *reg = info->base;
unsigned short status;
/* register on bf561 is cleared when read
* others are W1C
*/
status = bfin_read16(®->status);
if (status & 0x3000)
ppi->err = true;
bfin_write16(®->status, 0xff00);
break;
}
case PPI_TYPE_EPPI:
{
struct bfin_eppi_regs *reg = info->base;
unsigned short status;
status = bfin_read16(®->status);
if (status & 0x2)
ppi->err = true;
bfin_write16(®->status, 0xffff);
break;
}
case PPI_TYPE_EPPI3:
{
struct bfin_eppi3_regs *reg = info->base;
unsigned long stat;
stat = bfin_read32(®->stat);
if (stat & 0x2)
ppi->err = true;
bfin_write32(®->stat, 0xc0ff);
break;
}
default:
break;
}
return IRQ_HANDLED;
}
static int ppi_attach_irq(struct ppi_if *ppi, irq_handler_t handler)
{
const struct ppi_info *info = ppi->info;
int ret;
ret = request_dma(info->dma_ch, "PPI_DMA");
if (ret) {
pr_err("Unable to allocate DMA channel for PPI\n");
return ret;
}
set_dma_callback(info->dma_ch, handler, ppi);
if (ppi->err_int) {
ret = request_irq(info->irq_err, ppi_irq_err, 0, "PPI ERROR", ppi);
if (ret) {
pr_err("Unable to allocate IRQ for PPI\n");
free_dma(info->dma_ch);
}
}
return ret;
}
static void ppi_detach_irq(struct ppi_if *ppi)
{
const struct ppi_info *info = ppi->info;
if (ppi->err_int)
free_irq(info->irq_err, ppi);
free_dma(info->dma_ch);
}
static int ppi_start(struct ppi_if *ppi)
{
const struct ppi_info *info = ppi->info;
/* enable DMA */
enable_dma(info->dma_ch);
/* enable PPI */
ppi->ppi_control |= PORT_EN;
switch (info->type) {
case PPI_TYPE_PPI:
{
struct bfin_ppi_regs *reg = info->base;
bfin_write16(®->control, ppi->ppi_control);
break;
}
case PPI_TYPE_EPPI:
{
struct bfin_eppi_regs *reg = info->base;
bfin_write32(®->control, ppi->ppi_control);
break;
}
case PPI_TYPE_EPPI3:
{
struct bfin_eppi3_regs *reg = info->base;
bfin_write32(®->ctl, ppi->ppi_control);
break;
}
default:
return -EINVAL;
}
SSYNC();
return 0;
}
static int ppi_stop(struct ppi_if *ppi)
{
const struct ppi_info *info = ppi->info;
/* disable PPI */
ppi->ppi_control &= ~PORT_EN;
switch (info->type) {
case PPI_TYPE_PPI:
{
struct bfin_ppi_regs *reg = info->base;
bfin_write16(®->control, ppi->ppi_control);
break;
}
case PPI_TYPE_EPPI:
{
struct bfin_eppi_regs *reg = info->base;
bfin_write32(®->control, ppi->ppi_control);
break;
}
case PPI_TYPE_EPPI3:
{
struct bfin_eppi3_regs *reg = info->base;
bfin_write32(®->ctl, ppi->ppi_control);
break;
}
default:
return -EINVAL;
}
/* disable DMA */
clear_dma_irqstat(info->dma_ch);
disable_dma(info->dma_ch);
SSYNC();
return 0;
}
static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params)
{
const struct ppi_info *info = ppi->info;
int dma32 = 0;
int dma_config, bytes_per_line;
int hcount, hdelay, samples_per_line;
#ifdef CONFIG_PINCTRL
static const char * const pin_state[] = {"8bit", "16bit", "24bit"};
struct pinctrl *pctrl;
struct pinctrl_state *pstate;
if (params->dlen > 24 || params->dlen <= 0)
return -EINVAL;
pctrl = devm_pinctrl_get(ppi->dev);
pstate = pinctrl_lookup_state(pctrl,
pin_state[(params->dlen + 7) / 8 - 1]);
if (pinctrl_select_state(pctrl, pstate))
return -EINVAL;
#endif
bytes_per_line = params->width * params->bpp / 8;
/* convert parameters unit from pixels to samples */
hcount = params->width * params->bpp / params->dlen;
hdelay = params->hdelay * params->bpp / params->dlen;
samples_per_line = params->line * params->bpp / params->dlen;
if (params->int_mask == 0xFFFFFFFF)
ppi->err_int = false;
else
ppi->err_int = true;
dma_config = (DMA_FLOW_STOP | RESTART | DMA2D | DI_EN_Y);
ppi->ppi_control = params->ppi_control & ~PORT_EN;
if (!(ppi->ppi_control & PORT_DIR))
dma_config |= WNR;
switch (info->type) {
case PPI_TYPE_PPI:
{
struct bfin_ppi_regs *reg = info->base;
if (params->ppi_control & DMA32)
dma32 = 1;
bfin_write16(®->control, ppi->ppi_control);
bfin_write16(®->count, samples_per_line - 1);
bfin_write16(®->frame, params->frame);
break;
}
case PPI_TYPE_EPPI:
{
struct bfin_eppi_regs *reg = info->base;
if ((params->ppi_control & PACK_EN)
|| (params->ppi_control & 0x38000) > DLEN_16)
dma32 = 1;
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