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f529c8463f
All patches automatically rebased. Build system: x86_64 Build-tested: ipq806x/R7800 Run-tested: ipq806x/R7800 No dmesg regressions, everything functional Signed-off-by: John Audia <graysky@archlinux.us>
101 lines
2.8 KiB
Diff
101 lines
2.8 KiB
Diff
From 6e46fe6d9428a41543bd19644de3c9f2611b73bf Mon Sep 17 00:00:00 2001
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From: Han Xu <han.xu@nxp.com>
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Date: Wed, 5 Jun 2019 16:43:30 -0500
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Subject: [PATCH] MLK-21960-2: spi: fspi: dynamically alloc AHB memory
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dynamically allocate AHB memory as needed.
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Signed-off-by: Han Xu <han.xu@nxp.com>
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---
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drivers/spi/spi-nxp-fspi.c | 40 ++++++++++++++++++++++++++++++++++------
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1 file changed, 34 insertions(+), 6 deletions(-)
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--- a/drivers/spi/spi-nxp-fspi.c
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+++ b/drivers/spi/spi-nxp-fspi.c
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@@ -307,6 +307,7 @@
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#define POLL_TOUT 5000
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#define NXP_FSPI_MAX_CHIPSELECT 4
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+#define NXP_FSPI_MIN_IOMAP SZ_4M
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struct nxp_fspi_devtype_data {
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unsigned int rxfifo;
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@@ -345,6 +346,8 @@ struct nxp_fspi {
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void __iomem *ahb_addr;
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u32 memmap_phy;
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u32 memmap_phy_size;
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+ u32 memmap_start;
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+ u32 memmap_len;
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struct clk *clk, *clk_en;
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struct device *dev;
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struct completion c;
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@@ -657,12 +660,35 @@ static void nxp_fspi_select_mem(struct n
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f->selected = spi->chip_select;
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}
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-static void nxp_fspi_read_ahb(struct nxp_fspi *f, const struct spi_mem_op *op)
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+static int nxp_fspi_read_ahb(struct nxp_fspi *f, const struct spi_mem_op *op)
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{
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+ u32 start = op->addr.val;
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u32 len = op->data.nbytes;
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+ /* if necessary, ioremap before AHB read */
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+ if ((!f->ahb_addr) || start < f->memmap_start ||
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+ start + len > f->memmap_start + f->memmap_len) {
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+ if (f->ahb_addr)
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+ iounmap(f->ahb_addr);
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+
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+ f->memmap_start = start;
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+ f->memmap_len = len > NXP_FSPI_MIN_IOMAP ?
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+ len : NXP_FSPI_MIN_IOMAP;
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+
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+ f->ahb_addr = ioremap_wc(f->memmap_phy + f->memmap_start,
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+ f->memmap_len);
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+
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+ if (!f->ahb_addr) {
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+ dev_err(f->dev, "failed to alloc memory\n");
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+ return -ENOMEM;
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+ }
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+ }
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+
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/* Read out the data directly from the AHB buffer. */
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- memcpy_fromio(op->data.buf.in, (f->ahb_addr + op->addr.val), len);
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+ memcpy_fromio(op->data.buf.in,
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+ f->ahb_addr + start - f->memmap_start, len);
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+
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+ return 0;
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}
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static void nxp_fspi_fill_txfifo(struct nxp_fspi *f,
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@@ -822,7 +848,7 @@ static int nxp_fspi_exec_op(struct spi_m
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*/
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if (op->data.nbytes > (f->devtype_data->rxfifo - 4) &&
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op->data.dir == SPI_MEM_DATA_IN) {
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- nxp_fspi_read_ahb(f, op);
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+ err = nxp_fspi_read_ahb(f, op);
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} else {
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if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT)
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nxp_fspi_fill_txfifo(f, op);
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@@ -993,9 +1019,8 @@ static int nxp_fspi_probe(struct platfor
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/* find the resources - controller memory mapped space */
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_mmap");
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- f->ahb_addr = devm_ioremap_resource(dev, res);
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- if (IS_ERR(f->ahb_addr)) {
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- ret = PTR_ERR(f->ahb_addr);
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+ if (IS_ERR(res)) {
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+ ret = PTR_ERR(res);
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goto err_put_ctrl;
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}
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@@ -1079,6 +1104,9 @@ static int nxp_fspi_remove(struct platfo
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mutex_destroy(&f->lock);
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+ if (f->ahb_addr)
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+ iounmap(f->ahb_addr);
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+
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return 0;
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}
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