// SPDX-License-Identifier: GPL-2.0-only
/*
* OMAP1 / OMAP7xx - specific DMA driver
*
* Copyright ( C ) 2003 - 2008 Nokia Corporation
* Author : Juha Yrj ö l ä < juha . yrjola @ nokia . com >
* DMA channel linking for 1610 by Samuel Ortiz < samuel . ortiz @ nokia . com >
* Graphics DMA and LCD DMA graphics tranformations
* by Imre Deak < imre . deak @ nokia . com >
* OMAP2 / 3 support Copyright ( C ) 2004 - 2007 Texas Instruments , Inc .
* Some functions based on earlier dma - omap . c Copyright ( C ) 2001 RidgeRun , Inc .
*
* Copyright ( C ) 2010 Texas Instruments Incorporated - https : //www.ti.com/
* Converted DMA library into platform driver
* - G , Manjunath Kondaiah < manjugk @ ti . com >
*/
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/omap-dma.h>
#include "tc.h"
#include "soc.h"
#define OMAP1_DMA_BASE (0 xfffed800)
static u32 enable_1510_mode;
static const struct omap_dma_reg reg_map[] = {
[GCR] = { 0 x0400, 0 x00, OMAP_DMA_REG_16BIT },
[GSCR] = { 0 x0404, 0 x00, OMAP_DMA_REG_16BIT },
[GRST1] = { 0 x0408, 0 x00, OMAP_DMA_REG_16BIT },
[HW_ID] = { 0 x0442, 0 x00, OMAP_DMA_REG_16BIT },
[PCH2_ID] = { 0 x0444, 0 x00, OMAP_DMA_REG_16BIT },
[PCH0_ID] = { 0 x0446, 0 x00, OMAP_DMA_REG_16BIT },
[PCH1_ID] = { 0 x0448, 0 x00, OMAP_DMA_REG_16BIT },
[PCHG_ID] = { 0 x044a, 0 x00, OMAP_DMA_REG_16BIT },
[PCHD_ID] = { 0 x044c, 0 x00, OMAP_DMA_REG_16BIT },
[CAPS_0] = { 0 x044e, 0 x00, OMAP_DMA_REG_2X16BIT },
[CAPS_1] = { 0 x0452, 0 x00, OMAP_DMA_REG_2X16BIT },
[CAPS_2] = { 0 x0456, 0 x00, OMAP_DMA_REG_16BIT },
[CAPS_3] = { 0 x0458, 0 x00, OMAP_DMA_REG_16BIT },
[CAPS_4] = { 0 x045a, 0 x00, OMAP_DMA_REG_16BIT },
[PCH2_SR] = { 0 x0460, 0 x00, OMAP_DMA_REG_16BIT },
[PCH0_SR] = { 0 x0480, 0 x00, OMAP_DMA_REG_16BIT },
[PCH1_SR] = { 0 x0482, 0 x00, OMAP_DMA_REG_16BIT },
[PCHD_SR] = { 0 x04c0, 0 x00, OMAP_DMA_REG_16BIT },
/* Common Registers */
[CSDP] = { 0 x0000, 0 x40, OMAP_DMA_REG_16BIT },
[CCR] = { 0 x0002, 0 x40, OMAP_DMA_REG_16BIT },
[CICR] = { 0 x0004, 0 x40, OMAP_DMA_REG_16BIT },
[CSR] = { 0 x0006, 0 x40, OMAP_DMA_REG_16BIT },
[CEN] = { 0 x0010, 0 x40, OMAP_DMA_REG_16BIT },
[CFN] = { 0 x0012, 0 x40, OMAP_DMA_REG_16BIT },
[CSFI] = { 0 x0014, 0 x40, OMAP_DMA_REG_16BIT },
[CSEI] = { 0 x0016, 0 x40, OMAP_DMA_REG_16BIT },
[CPC] = { 0 x0018, 0 x40, OMAP_DMA_REG_16BIT }, /* 15xx only */
[CSAC] = { 0 x0018, 0 x40, OMAP_DMA_REG_16BIT },
[CDAC] = { 0 x001a, 0 x40, OMAP_DMA_REG_16BIT },
[CDEI] = { 0 x001c, 0 x40, OMAP_DMA_REG_16BIT },
[CDFI] = { 0 x001e, 0 x40, OMAP_DMA_REG_16BIT },
[CLNK_CTRL] = { 0 x0028, 0 x40, OMAP_DMA_REG_16BIT },
/* Channel specific register offsets */
[CSSA] = { 0 x0008, 0 x40, OMAP_DMA_REG_2X16BIT },
[CDSA] = { 0 x000c, 0 x40, OMAP_DMA_REG_2X16BIT },
[COLOR] = { 0 x0020, 0 x40, OMAP_DMA_REG_2X16BIT },
[CCR2] = { 0 x0024, 0 x40, OMAP_DMA_REG_16BIT },
[LCH_CTRL] = { 0 x002a, 0 x40, OMAP_DMA_REG_16BIT },
};
static struct resource res[] __initdata = {
[0 ] = {
.start = OMAP1_DMA_BASE,
.end = OMAP1_DMA_BASE + SZ_2K - 1 ,
.flags = IORESOURCE_MEM,
},
[1 ] = {
.name = "0" ,
.start = INT_DMA_CH0_6,
.flags = IORESOURCE_IRQ,
},
[2 ] = {
.name = "1" ,
.start = INT_DMA_CH1_7,
.flags = IORESOURCE_IRQ,
},
[3 ] = {
.name = "2" ,
.start = INT_DMA_CH2_8,
.flags = IORESOURCE_IRQ,
},
[4 ] = {
.name = "3" ,
.start = INT_DMA_CH3,
.flags = IORESOURCE_IRQ,
},
[5 ] = {
.name = "4" ,
.start = INT_DMA_CH4,
.flags = IORESOURCE_IRQ,
},
[6 ] = {
.name = "5" ,
.start = INT_DMA_CH5,
.flags = IORESOURCE_IRQ,
},
/* Handled in lcd_dma.c */
[7 ] = {
.name = "6" ,
.start = INT_1610_DMA_CH6,
.flags = IORESOURCE_IRQ,
},
/* irq's for omap16xx and omap7xx */
[8 ] = {
.name = "7" ,
.start = INT_1610_DMA_CH7,
.flags = IORESOURCE_IRQ,
},
[9 ] = {
.name = "8" ,
.start = INT_1610_DMA_CH8,
.flags = IORESOURCE_IRQ,
},
[10 ] = {
.name = "9" ,
.start = INT_1610_DMA_CH9,
.flags = IORESOURCE_IRQ,
},
[11 ] = {
.name = "10" ,
.start = INT_1610_DMA_CH10,
.flags = IORESOURCE_IRQ,
},
[12 ] = {
.name = "11" ,
.start = INT_1610_DMA_CH11,
.flags = IORESOURCE_IRQ,
},
[13 ] = {
.name = "12" ,
.start = INT_1610_DMA_CH12,
.flags = IORESOURCE_IRQ,
},
[14 ] = {
.name = "13" ,
.start = INT_1610_DMA_CH13,
.flags = IORESOURCE_IRQ,
},
[15 ] = {
.name = "14" ,
.start = INT_1610_DMA_CH14,
.flags = IORESOURCE_IRQ,
},
[16 ] = {
.name = "15" ,
.start = INT_1610_DMA_CH15,
.flags = IORESOURCE_IRQ,
},
[17 ] = {
.name = "16" ,
.start = INT_DMA_LCD,
.flags = IORESOURCE_IRQ,
},
};
static void __iomem *dma_base;
static inline void dma_write(u32 val, int reg, int lch)
{
void __iomem *addr = dma_base;
addr += reg_map[reg].offset;
addr += reg_map[reg].stride * lch;
__raw_writew(val, addr);
if (reg_map[reg].type == OMAP_DMA_REG_2X16BIT)
__raw_writew(val >> 16 , addr + 2 );
}
static inline u32 dma_read(int reg, int lch)
{
void __iomem *addr = dma_base;
uint32_t val;
addr += reg_map[reg].offset;
addr += reg_map[reg].stride * lch;
val = __raw_readw(addr);
if (reg_map[reg].type == OMAP_DMA_REG_2X16BIT)
val |= __raw_readw(addr + 2 ) << 16 ;
return val;
}
static void omap1_clear_lch_regs(int lch)
{
int i;
for (i = CPC; i <= COLOR; i += 1 )
dma_write(0 , i, lch);
}
static void omap1_clear_dma(int lch)
{
u32 l;
l = dma_read(CCR, lch);
l &= ~OMAP_DMA_CCR_EN;
dma_write(l, CCR, lch);
/* Clear pending interrupts */
l = dma_read(CSR, lch);
}
static void omap1_show_dma_caps(void )
{
if (enable_1510_mode) {
printk(KERN_INFO "DMA support for OMAP15xx initialized\n" );
} else {
u16 w;
printk(KERN_INFO "OMAP DMA hardware version %d\n" ,
dma_read(HW_ID, 0 ));
printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n" ,
dma_read(CAPS_0, 0 ), dma_read(CAPS_1, 0 ),
dma_read(CAPS_2, 0 ), dma_read(CAPS_3, 0 ),
dma_read(CAPS_4, 0 ));
/* Disable OMAP 3.0/3.1 compatibility mode. */
w = dma_read(GSCR, 0 );
w |= 1 << 3 ;
dma_write(w, GSCR, 0 );
}
}
static unsigned configure_dma_errata(void )
{
unsigned errata = 0 ;
/*
* Erratum 3 . 2 / 3 . 3 : sometimes 0 is returned if CSAC / CDAC is
* read before the DMA controller finished disabling the channel .
*/
if (!cpu_is_omap15xx())
SET_DMA_ERRATA(DMA_ERRATA_3_3);
return errata;
}
static const struct platform_device_info omap_dma_dev_info = {
.name = "omap-dma-engine" ,
.id = -1 ,
.dma_mask = DMA_BIT_MASK(32 ),
.res = res,
.num_res = 1 ,
};
/* OMAP1510, OMAP1610*/
static const struct dma_slave_map omap1xxx_sdma_map[] = {
{ "omap-mcbsp.1" , "tx" , SDMA_FILTER_PARAM(8 ) },
{ "omap-mcbsp.1" , "rx" , SDMA_FILTER_PARAM(9 ) },
{ "omap-mcbsp.3" , "tx" , SDMA_FILTER_PARAM(10 ) },
{ "omap-mcbsp.3" , "rx" , SDMA_FILTER_PARAM(11 ) },
{ "omap-mcbsp.2" , "tx" , SDMA_FILTER_PARAM(16 ) },
{ "omap-mcbsp.2" , "rx" , SDMA_FILTER_PARAM(17 ) },
{ "mmci-omap.0" , "tx" , SDMA_FILTER_PARAM(21 ) },
{ "mmci-omap.0" , "rx" , SDMA_FILTER_PARAM(22 ) },
{ "omap_udc" , "rx0" , SDMA_FILTER_PARAM(26 ) },
{ "omap_udc" , "rx1" , SDMA_FILTER_PARAM(27 ) },
{ "omap_udc" , "rx2" , SDMA_FILTER_PARAM(28 ) },
{ "omap_udc" , "tx0" , SDMA_FILTER_PARAM(29 ) },
{ "omap_udc" , "tx1" , SDMA_FILTER_PARAM(30 ) },
{ "omap_udc" , "tx2" , SDMA_FILTER_PARAM(31 ) },
{ "mmci-omap.1" , "tx" , SDMA_FILTER_PARAM(54 ) },
{ "mmci-omap.1" , "rx" , SDMA_FILTER_PARAM(55 ) },
};
static struct omap_system_dma_plat_info dma_plat_info __initdata = {
.reg_map = reg_map,
.channel_stride = 0 x40,
.show_dma_caps = omap1_show_dma_caps,
.clear_lch_regs = omap1_clear_lch_regs,
.clear_dma = omap1_clear_dma,
.dma_write = dma_write,
.dma_read = dma_read,
};
static int __init omap1_system_dma_init(void )
{
struct omap_system_dma_plat_info p;
struct omap_dma_dev_attr *d;
struct platform_device *pdev, *dma_pdev;
int ret;
pdev = platform_device_alloc("omap_dma_system" , 0 );
if (!pdev) {
pr_err("%s: Unable to device alloc for dma\n" ,
__func__);
return -ENOMEM;
}
dma_base = ioremap(res[0 ].start, resource_size(&res[0 ]));
if (!dma_base) {
pr_err("%s: Unable to ioremap\n" , __func__);
ret = -ENODEV;
goto exit_device_put;
}
ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
if (ret) {
dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n" ,
__func__, pdev->name, pdev->id);
goto exit_iounmap;
}
d = kzalloc(sizeof (*d), GFP_KERNEL);
if (!d) {
ret = -ENOMEM;
goto exit_iounmap;
}
/* Valid attributes for omap1 plus processors */
if (cpu_is_omap15xx())
d->dev_caps = ENABLE_1510_MODE;
enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
if (cpu_is_omap16xx())
d->dev_caps = ENABLE_16XX_MODE;
d->dev_caps |= SRC_PORT;
d->dev_caps |= DST_PORT;
d->dev_caps |= SRC_INDEX;
d->dev_caps |= DST_INDEX;
d->dev_caps |= IS_BURST_ONLY4;
d->dev_caps |= CLEAR_CSR_ON_READ;
d->dev_caps |= IS_WORD_16;
/* available logical channels */
if (cpu_is_omap15xx()) {
d->lch_count = 9 ;
} else {
if (d->dev_caps & ENABLE_1510_MODE)
d->lch_count = 9 ;
else
d->lch_count = 16 ;
}
p = dma_plat_info;
p.dma_attr = d;
p.errata = configure_dma_errata();
p.slave_map = omap1xxx_sdma_map;
p.slavecnt = ARRAY_SIZE(omap1xxx_sdma_map);
ret = platform_device_add_data(pdev, &p, sizeof (p));
if (ret) {
dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n" ,
__func__, pdev->name, pdev->id);
goto exit_release_d;
}
ret = platform_device_add(pdev);
if (ret) {
dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n" ,
__func__, pdev->name, pdev->id);
goto exit_release_d;
}
dma_pdev = platform_device_register_full(&omap_dma_dev_info);
if (IS_ERR(dma_pdev)) {
ret = PTR_ERR(dma_pdev);
goto exit_release_pdev;
}
return ret;
exit_release_pdev:
platform_device_del(pdev);
exit_release_d:
kfree(d);
exit_iounmap:
iounmap(dma_base);
exit_device_put:
platform_device_put(pdev);
return ret;
}
arch_initcall(omap1_system_dma_init);
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