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spi: fspi: dynamically alloc AHB memory

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Apply patch from NXP upstream repo to
dynamically allocate AHB memory as needed.

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Han Xu <han.xu@nxp.com>

Link: https://lore.kernel.org/r/20200126140913.2139260-2-aford173@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Han Xu 2020-01-26 08:09:09 -06:00 committed by Mark Brown
parent 941be8a73f
commit d166a73503
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 34 additions and 6 deletions
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40
drivers/spi/spi-nxp-fspi.c
View file

@ -307,6 +307,7 @@
#define POLL_TOUT 5000 #define POLL_TOUT 5000
#define NXP_FSPI_MAX_CHIPSELECT 4 #define NXP_FSPI_MAX_CHIPSELECT 4
#define NXP_FSPI_MIN_IOMAP SZ_4M
struct nxp_fspi_devtype_data { struct nxp_fspi_devtype_data {
unsigned int rxfifo; unsigned int rxfifo;
@ -345,6 +346,8 @@ struct nxp_fspi {
void __iomem *ahb_addr; void __iomem *ahb_addr;
u32 memmap_phy; u32 memmap_phy;
u32 memmap_phy_size; u32 memmap_phy_size;
u32 memmap_start;
u32 memmap_len;
struct clk *clk, *clk_en; struct clk *clk, *clk_en;
struct device *dev; struct device *dev;
struct completion c; 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; 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; 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. */ /* 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, 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) && if (op->data.nbytes > (f->devtype_data->rxfifo - 4) &&
op->data.dir == SPI_MEM_DATA_IN) { op->data.dir == SPI_MEM_DATA_IN) {
nxp_fspi_read_ahb(f, op); err = nxp_fspi_read_ahb(f, op);
} else { } else {
if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT) if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT)
nxp_fspi_fill_txfifo(f, op); 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 */ /* find the resources - controller memory mapped space */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_mmap"); res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_mmap");
f->ahb_addr = devm_ioremap_resource(dev, res); if (IS_ERR(res)) {
if (IS_ERR(f->ahb_addr)) { ret = PTR_ERR(res);
ret = PTR_ERR(f->ahb_addr);
goto err_put_ctrl; goto err_put_ctrl;
} }
@ -1073,6 +1098,9 @@ static int nxp_fspi_remove(struct platform_device *pdev)
mutex_destroy(&f->lock); mutex_destroy(&f->lock);
if (f->ahb_addr)
iounmap(f->ahb_addr);
return 0; return 0;
} }