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dmaengine: fsl-edma: add edma version and configurable registers 

This patch adds configurable registers (using __iomem addresses)
to allow the use of fsl-edma-common code with slightly different
edma module versions, as Vybrid (v1) and ColdFire (v2) are.

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Angelo Dureghello 2018-08-19 19:27:14 +02:00 committed by Vinod Koul
parent 9d831528a6
commit 377eaf3b3c
3 changed files with 126 additions and 74 deletions
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106
drivers/dma/fsl-edma-common.c
View File

@ -43,20 +43,20 @@
static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
{
void __iomem *addr = fsl_chan->edma->membase;
struct edma_regs *regs = &fsl_chan->edma->regs;
u32 ch = fsl_chan->vchan.chan.chan_id;
edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI);
edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ);
edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), regs->seei);
edma_writeb(fsl_chan->edma, ch, regs->serq);
}
void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
{
void __iomem *addr = fsl_chan->edma->membase;
struct edma_regs *regs = &fsl_chan->edma->regs;
u32 ch = fsl_chan->vchan.chan.chan_id;
edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ);
edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI);
edma_writeb(fsl_chan->edma, ch, regs->cerq);
edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), regs->ceei);
}
EXPORT_SYMBOL_GPL(fsl_edma_disable_request);
@ -184,7 +184,7 @@ static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
struct virt_dma_desc *vdesc, bool in_progress)
{
struct fsl_edma_desc *edesc = fsl_chan->edesc;
void __iomem *addr = fsl_chan->edma->membase;
struct edma_regs *regs = &fsl_chan->edma->regs;
u32 ch = fsl_chan->vchan.chan.chan_id;
enum dma_transfer_direction dir = fsl_chan->fsc.dir;
dma_addr_t cur_addr, dma_addr;
@ -200,11 +200,9 @@ static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
return len;
if (dir == DMA_MEM_TO_DEV)
cur_addr = edma_readl(
fsl_chan->edma, addr + EDMA_TCD_SADDR(ch));
cur_addr = edma_readl(fsl_chan->edma, &regs->tcd[ch].saddr);
else
cur_addr = edma_readl(
fsl_chan->edma, addr + EDMA_TCD_DADDR(ch));
cur_addr = edma_readl(fsl_chan->edma, &regs->tcd[ch].daddr);
/* figure out the finished and calculate the residue */
for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
@ -261,7 +259,7 @@ static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
struct fsl_edma_hw_tcd *tcd)
{
struct fsl_edma_engine *edma = fsl_chan->edma;
void __iomem *addr = fsl_chan->edma->membase;
struct edma_regs *regs = &fsl_chan->edma->regs;
u32 ch = fsl_chan->vchan.chan.chan_id;
/*
@ -269,24 +267,24 @@ static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
* endian format. However, we need to load the TCD registers in
* big- or little-endian obeying the eDMA engine model endian.
*/
edma_writew(edma, 0, addr + EDMA_TCD_CSR(ch));
edma_writel(edma, le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR(ch));
edma_writel(edma, le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR(ch));
edma_writew(edma, 0, &regs->tcd[ch].csr);
edma_writel(edma, le32_to_cpu(tcd->saddr), &regs->tcd[ch].saddr);
edma_writel(edma, le32_to_cpu(tcd->daddr), &regs->tcd[ch].daddr);
edma_writew(edma, le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR(ch));
edma_writew(edma, le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF(ch));
edma_writew(edma, le16_to_cpu(tcd->attr), &regs->tcd[ch].attr);
edma_writew(edma, le16_to_cpu(tcd->soff), &regs->tcd[ch].soff);
edma_writel(edma, le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES(ch));
edma_writel(edma, le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST(ch));
edma_writel(edma, le32_to_cpu(tcd->nbytes), &regs->tcd[ch].nbytes);
edma_writel(edma, le32_to_cpu(tcd->slast), &regs->tcd[ch].slast);
edma_writew(edma, le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER(ch));
edma_writew(edma, le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER(ch));
edma_writew(edma, le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF(ch));
edma_writew(edma, le16_to_cpu(tcd->citer), &regs->tcd[ch].citer);
edma_writew(edma, le16_to_cpu(tcd->biter), &regs->tcd[ch].biter);
edma_writew(edma, le16_to_cpu(tcd->doff), &regs->tcd[ch].doff);
edma_writel(edma,
le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA(ch));
edma_writel(edma, le32_to_cpu(tcd->dlast_sga),
&regs->tcd[ch].dlast_sga);
edma_writew(edma, le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR(ch));
edma_writew(edma, le16_to_cpu(tcd->csr), &regs->tcd[ch].csr);
}
static inline
@ -308,15 +306,15 @@ void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
tcd->attr = cpu_to_le16(attr);
tcd->soff = cpu_to_le16(EDMA_TCD_SOFF_SOFF(soff));
tcd->soff = cpu_to_le16(soff);
tcd->nbytes = cpu_to_le32(EDMA_TCD_NBYTES_NBYTES(nbytes));
tcd->slast = cpu_to_le32(EDMA_TCD_SLAST_SLAST(slast));
tcd->nbytes = cpu_to_le32(nbytes);
tcd->slast = cpu_to_le32(slast);
tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));
tcd->doff = cpu_to_le16(EDMA_TCD_DOFF_DOFF(doff));
tcd->doff = cpu_to_le16(doff);
tcd->dlast_sga = cpu_to_le32(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga));
tcd->dlast_sga = cpu_to_le32(dlast_sga);
tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));
if (major_int)
@ -549,4 +547,52 @@ void fsl_edma_cleanup_vchan(struct dma_device *dmadev)
}
EXPORT_SYMBOL_GPL(fsl_edma_cleanup_vchan);
/*
* On the 32 channels Vybrid/mpc577x edma version (here called "v1"),
* register offsets are different compared to ColdFire mcf5441x 64 channels
* edma (here called "v2").
*
* This function sets up register offsets as per proper declared version
* so must be called in xxx_edma_probe() just after setting the
* edma "version" and "membase" appropriately.
*/
void fsl_edma_setup_regs(struct fsl_edma_engine *edma)
{
edma->regs.cr = edma->membase + EDMA_CR;
edma->regs.es = edma->membase + EDMA_ES;
edma->regs.erql = edma->membase + EDMA_ERQ;
edma->regs.eeil = edma->membase + EDMA_EEI;
edma->regs.serq = edma->membase + ((edma->version == v1) ?
EDMA_SERQ : EDMA64_SERQ);
edma->regs.cerq = edma->membase + ((edma->version == v1) ?
EDMA_CERQ : EDMA64_CERQ);
edma->regs.seei = edma->membase + ((edma->version == v1) ?
EDMA_SEEI : EDMA64_SEEI);
edma->regs.ceei = edma->membase + ((edma->version == v1) ?
EDMA_CEEI : EDMA64_CEEI);
edma->regs.cint = edma->membase + ((edma->version == v1) ?
EDMA_CINT : EDMA64_CINT);
edma->regs.cerr = edma->membase + ((edma->version == v1) ?
EDMA_CERR : EDMA64_CERR);
edma->regs.ssrt = edma->membase + ((edma->version == v1) ?
EDMA_SSRT : EDMA64_SSRT);
edma->regs.cdne = edma->membase + ((edma->version == v1) ?
EDMA_CDNE : EDMA64_CDNE);
edma->regs.intl = edma->membase + ((edma->version == v1) ?
EDMA_INTR : EDMA64_INTL);
edma->regs.errl = edma->membase + ((edma->version == v1) ?
EDMA_ERR : EDMA64_ERRL);
if (edma->version == v2) {
edma->regs.erqh = edma->membase + EDMA64_ERQH;
edma->regs.eeih = edma->membase + EDMA64_EEIH;
edma->regs.errh = edma->membase + EDMA64_ERRH;
edma->regs.inth = edma->membase + EDMA64_INTH;
}
edma->regs.tcd = edma->membase + EDMA_TCD;
}
EXPORT_SYMBOL_GPL(fsl_edma_setup_regs);
MODULE_LICENSE("GPL v2");

62
drivers/dma/fsl-edma-common.h
View File

@ -8,35 +8,6 @@
#include "virt-dma.h"
#define EDMA_CR 0x00
#define EDMA_ES 0x04
#define EDMA_ERQ 0x0C
#define EDMA_EEI 0x14
#define EDMA_SERQ 0x1B
#define EDMA_CERQ 0x1A
#define EDMA_SEEI 0x19
#define EDMA_CEEI 0x18
#define EDMA_CINT 0x1F
#define EDMA_CERR 0x1E
#define EDMA_SSRT 0x1D
#define EDMA_CDNE 0x1C
#define EDMA_INTR 0x24
#define EDMA_ERR 0x2C
#define EDMA_TCD_SADDR(x) (0x1000 + 32 * (x))
#define EDMA_TCD_SOFF(x) (0x1004 + 32 * (x))
#define EDMA_TCD_ATTR(x) (0x1006 + 32 * (x))
#define EDMA_TCD_NBYTES(x) (0x1008 + 32 * (x))
#define EDMA_TCD_SLAST(x) (0x100C + 32 * (x))
#define EDMA_TCD_DADDR(x) (0x1010 + 32 * (x))
#define EDMA_TCD_DOFF(x) (0x1014 + 32 * (x))
#define EDMA_TCD_CITER_ELINK(x) (0x1016 + 32 * (x))
#define EDMA_TCD_CITER(x) (0x1016 + 32 * (x))
#define EDMA_TCD_DLAST_SGA(x) (0x1018 + 32 * (x))
#define EDMA_TCD_CSR(x) (0x101C + 32 * (x))
#define EDMA_TCD_BITER_ELINK(x) (0x101E + 32 * (x))
#define EDMA_TCD_BITER(x) (0x101E + 32 * (x))
#define EDMA_CR_EDBG BIT(1)
#define EDMA_CR_ERCA BIT(2)
#define EDMA_CR_ERGA BIT(3)
@ -114,6 +85,31 @@ struct fsl_edma_hw_tcd {
__le16 biter;
};
/*
* These are iomem pointers, for both v32 and v64.
*/
struct edma_regs {
void __iomem *cr;
void __iomem *es;
void __iomem *erqh;
void __iomem *erql; /* aka erq on v32 */
void __iomem *eeih;
void __iomem *eeil; /* aka eei on v32 */
void __iomem *seei;
void __iomem *ceei;
void __iomem *serq;
void __iomem *cerq;
void __iomem *cint;
void __iomem *cerr;
void __iomem *ssrt;
void __iomem *cdne;
void __iomem *inth;
void __iomem *intl;
void __iomem *errh;
void __iomem *errl;
struct fsl_edma_hw_tcd __iomem *tcd;
};
struct fsl_edma_sw_tcd {
dma_addr_t ptcd;
struct fsl_edma_hw_tcd *vtcd;
@ -147,6 +143,11 @@ struct fsl_edma_desc {
struct fsl_edma_sw_tcd tcd[];
};
enum edma_version {
v1, /* 32ch, Vybdir, mpc57x, etc */
v2, /* 64ch Coldfire */
};
struct fsl_edma_engine {
struct dma_device dma_dev;
void __iomem *membase;
@ -157,6 +158,8 @@ struct fsl_edma_engine {
int txirq;
int errirq;
bool big_endian;
enum edma_version version;
struct edma_regs regs;
struct fsl_edma_chan chans[];
};
@ -237,5 +240,6 @@ void fsl_edma_issue_pending(struct dma_chan *chan);
int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
void fsl_edma_free_chan_resources(struct dma_chan *chan);
void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
void fsl_edma_setup_regs(struct fsl_edma_engine *edma);
#endif /* _FSL_EDMA_COMMON_H_ */

32
drivers/dma/fsl-edma.c
View File

@ -28,19 +28,16 @@ static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *fsl_edma = dev_id;
unsigned int intr, ch;
void __iomem *base_addr;
struct edma_regs *regs = &fsl_edma->regs;
struct fsl_edma_chan *fsl_chan;
base_addr = fsl_edma->membase;
intr = edma_readl(fsl_edma, base_addr + EDMA_INTR);
intr = edma_readl(fsl_edma, regs->intl);
if (!intr)
return IRQ_NONE;
for (ch = 0; ch < fsl_edma->n_chans; ch++) {
if (intr & (0x1 << ch)) {
edma_writeb(fsl_edma, EDMA_CINT_CINT(ch),
base_addr + EDMA_CINT);
edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), regs->cint);
fsl_chan = &fsl_edma->chans[ch];
@ -68,16 +65,16 @@ static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *fsl_edma = dev_id;
unsigned int err, ch;
struct edma_regs *regs = &fsl_edma->regs;
err = edma_readl(fsl_edma, fsl_edma->membase + EDMA_ERR);
err = edma_readl(fsl_edma, regs->errl);
if (!err)
return IRQ_NONE;
for (ch = 0; ch < fsl_edma->n_chans; ch++) {
if (err & (0x1 << ch)) {
fsl_edma_disable_request(&fsl_edma->chans[ch]);
edma_writeb(fsl_edma, EDMA_CERR_CERR(ch),
fsl_edma->membase + EDMA_CERR);
edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), regs->cerr);
fsl_edma->chans[ch].status = DMA_ERROR;
fsl_edma->chans[ch].idle = true;
}
@ -192,6 +189,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct fsl_edma_engine *fsl_edma;
struct fsl_edma_chan *fsl_chan;
struct edma_regs *regs;
struct resource *res;
int len, chans;
int ret, i;
@ -207,6 +205,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
if (!fsl_edma)
return -ENOMEM;
fsl_edma->version = v1;
fsl_edma->n_chans = chans;
mutex_init(&fsl_edma->fsl_edma_mutex);
@ -215,6 +214,9 @@ static int fsl_edma_probe(struct platform_device *pdev)
if (IS_ERR(fsl_edma->membase))
return PTR_ERR(fsl_edma->membase);
fsl_edma_setup_regs(fsl_edma);
regs = &fsl_edma->regs;
for (i = 0; i < DMAMUX_NR; i++) {
char clkname[32];
@ -255,11 +257,11 @@ static int fsl_edma_probe(struct platform_device *pdev)
fsl_chan->vchan.desc_free = fsl_edma_free_desc;
vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i));
edma_writew(fsl_edma, 0x0, &regs->tcd[i].csr);
fsl_edma_chan_mux(fsl_chan, 0, false);
}
edma_writel(fsl_edma, ~0, fsl_edma->membase + EDMA_INTR);
edma_writel(fsl_edma, ~0, regs->intl);
ret = fsl_edma_irq_init(pdev, fsl_edma);
if (ret)
return ret;
@ -306,7 +308,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
}
/* enable round robin arbitration */
edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, fsl_edma->membase + EDMA_CR);
edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
return 0;
}
@ -353,18 +355,18 @@ static int fsl_edma_resume_early(struct device *dev)
{
struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
struct fsl_edma_chan *fsl_chan;
struct edma_regs *regs = &fsl_edma->regs;
int i;
for (i = 0; i < fsl_edma->n_chans; i++) {
fsl_chan = &fsl_edma->chans[i];
fsl_chan->pm_state = RUNNING;
edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i));
edma_writew(fsl_edma, 0x0, &regs->tcd[i].csr);
if (fsl_chan->slave_id != 0)
fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, true);
}
edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA,
fsl_edma->membase + EDMA_CR);
edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
return 0;
}