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alistair23-linux
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MLK-21960-2: spi: fspi: dynamically alloc AHB memory 

dynamically allocate AHB memory as needed.

Signed-off-by: Han Xu <han.xu@nxp.com>
5.4-rM2-2.2.x-imx-squashed
Han Xu 2019-06-05 16:43:30 -05:00 committed by Dong Aisheng
parent 6283e73009
commit e2aff3e4c2
1 changed files with 34 additions and 6 deletions
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40
drivers/spi/spi-nxp-fspi.c
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@ -307,6 +307,7 @@
#define POLL_TOUT 5000
#define NXP_FSPI_MAX_CHIPSELECT 4
#define NXP_FSPI_MIN_IOMAP SZ_4M
struct nxp_fspi_devtype_data {
unsigned int rxfifo;
@ -345,6 +346,8 @@ struct nxp_fspi {
void __iomem *ahb_addr;
u32 memmap_phy;
u32 memmap_phy_size;
u32 memmap_start;
u32 memmap_len;
struct clk *clk, *clk_en;
struct device *dev;
struct completion c;
@ -657,12 +660,35 @@ static void nxp_fspi_select_mem(struct nxp_fspi *f, struct spi_device *spi)
f->selected = spi->chip_select;
}
static void nxp_fspi_read_ahb(struct nxp_fspi *f, const struct spi_mem_op *op)
static int nxp_fspi_read_ahb(struct nxp_fspi *f, const struct spi_mem_op *op)
{
u32 start = op->addr.val;
u32 len = op->data.nbytes;
/* if necessary, ioremap before AHB read */
if ((!f->ahb_addr) || start < f->memmap_start ||
start + len > f->memmap_start + f->memmap_len) {
if (f->ahb_addr)
iounmap(f->ahb_addr);
f->memmap_start = start;
f->memmap_len = len > NXP_FSPI_MIN_IOMAP ?
len : NXP_FSPI_MIN_IOMAP;
f->ahb_addr = ioremap_wc(f->memmap_phy + f->memmap_start,
f->memmap_len);
if (!f->ahb_addr) {
dev_err(f->dev, "failed to alloc memory\n");
return -ENOMEM;
}
}
/* Read out the data directly from the AHB buffer. */
memcpy_fromio(op->data.buf.in, (f->ahb_addr + op->addr.val), len);
memcpy_fromio(op->data.buf.in,
f->ahb_addr + start - f->memmap_start, len);
return 0;
}
static void nxp_fspi_fill_txfifo(struct nxp_fspi *f,
@ -822,7 +848,7 @@ static int nxp_fspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
*/
if (op->data.nbytes > (f->devtype_data->rxfifo - 4) &&
op->data.dir == SPI_MEM_DATA_IN) {
nxp_fspi_read_ahb(f, op);
err = nxp_fspi_read_ahb(f, op);
} else {
if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT)
nxp_fspi_fill_txfifo(f, op);
@ -992,9 +1018,8 @@ static int nxp_fspi_probe(struct platform_device *pdev)
/* find the resources - controller memory mapped space */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_mmap");
f->ahb_addr = devm_ioremap_resource(dev, res);
if (IS_ERR(f->ahb_addr)) {
ret = PTR_ERR(f->ahb_addr);
if (IS_ERR(res)) {
ret = PTR_ERR(res);
goto err_put_ctrl;
}
@ -1073,6 +1098,9 @@ static int nxp_fspi_remove(struct platform_device *pdev)
mutex_destroy(&f->lock);
if (f->ahb_addr)
iounmap(f->ahb_addr);
return 0;
}