diff options
Diffstat (limited to 'target/linux/ath79/patches-5.4/0051-spi-add-driver-for-ar934x-spi-controller.patch')
-rw-r--r-- | target/linux/ath79/patches-5.4/0051-spi-add-driver-for-ar934x-spi-controller.patch | 283 |
1 files changed, 0 insertions, 283 deletions
diff --git a/target/linux/ath79/patches-5.4/0051-spi-add-driver-for-ar934x-spi-controller.patch b/target/linux/ath79/patches-5.4/0051-spi-add-driver-for-ar934x-spi-controller.patch deleted file mode 100644 index e314fa2cd3..0000000000 --- a/target/linux/ath79/patches-5.4/0051-spi-add-driver-for-ar934x-spi-controller.patch +++ /dev/null @@ -1,283 +0,0 @@ -From 7e161c423a232ef7ddf6c11b09ebe471dd5a23cf Mon Sep 17 00:00:00 2001 -From: Chuanhong Guo <gch981213@gmail.com> -Date: Wed, 5 Feb 2020 18:25:37 +0800 -Subject: [PATCH v4 1/2] spi: add driver for ar934x spi controller - -This patch adds driver for SPI controller found in Qualcomm Atheros -AR934x/QCA95xx SoCs. -This controller is a superset of the already supported qca,ar7100-spi. -Besides the bit-bang mode in spi-ath79.c, this new controller added -a new "shift register" mode, allowing faster spi operations. - -Signed-off-by: Chuanhong Guo <gch981213@gmail.com> ---- - drivers/spi/Kconfig | 7 ++ - drivers/spi/Makefile | 1 + - drivers/spi/spi-ar934x.c | 235 +++++++++++++++++++++++++++++++++++++++ - 3 files changed, 243 insertions(+) - create mode 100644 drivers/spi/spi-ar934x.c - ---- a/drivers/spi/Kconfig -+++ b/drivers/spi/Kconfig -@@ -62,6 +62,13 @@ config SPI_ALTERA - help - This is the driver for the Altera SPI Controller. - -+config SPI_AR934X -+ tristate "Qualcomm Atheros AR934X/QCA95XX SPI controller driver" -+ depends on ATH79 || COMPILE_TEST -+ help -+ This enables support for the SPI controller present on the -+ Qualcomm Atheros AR934X/QCA95XX SoCs. -+ - config SPI_ATH79 - tristate "Atheros AR71XX/AR724X/AR913X SPI controller driver" - depends on ATH79 || COMPILE_TEST ---- a/drivers/spi/Makefile -+++ b/drivers/spi/Makefile -@@ -14,6 +14,7 @@ obj-$(CONFIG_SPI_LOOPBACK_TEST) += spi- - - # SPI master controller drivers (bus) - obj-$(CONFIG_SPI_ALTERA) += spi-altera.o -+obj-$(CONFIG_SPI_AR934X) += spi-ar934x.o - obj-$(CONFIG_SPI_ARMADA_3700) += spi-armada-3700.o - obj-$(CONFIG_SPI_ATMEL) += spi-atmel.o - obj-$(CONFIG_SPI_ATMEL_QUADSPI) += atmel-quadspi.o ---- /dev/null -+++ b/drivers/spi/spi-ar934x.c -@@ -0,0 +1,235 @@ -+// SPDX-License-Identifier: GPL-2.0 -+// -+// SPI controller driver for Qualcomm Atheros AR934x/QCA95xx SoCs -+// -+// Copyright (C) 2020 Chuanhong Guo <gch981213@gmail.com> -+// -+// Based on spi-mt7621.c: -+// Copyright (C) 2011 Sergiy <piratfm@gmail.com> -+// Copyright (C) 2011-2013 Gabor Juhos <juhosg@openwrt.org> -+// Copyright (C) 2014-2015 Felix Fietkau <nbd@nbd.name> -+ -+#include <linux/clk.h> -+#include <linux/io.h> -+#include <linux/iopoll.h> -+#include <linux/kernel.h> -+#include <linux/module.h> -+#include <linux/of_device.h> -+#include <linux/spi/spi.h> -+ -+#define DRIVER_NAME "spi-ar934x" -+ -+#define AR934X_SPI_REG_FS 0x00 -+#define AR934X_SPI_ENABLE BIT(0) -+ -+#define AR934X_SPI_REG_IOC 0x08 -+#define AR934X_SPI_IOC_INITVAL 0x70000 -+ -+#define AR934X_SPI_REG_CTRL 0x04 -+#define AR934X_SPI_CLK_MASK GENMASK(5, 0) -+ -+#define AR934X_SPI_DATAOUT 0x10 -+ -+#define AR934X_SPI_REG_SHIFT_CTRL 0x14 -+#define AR934X_SPI_SHIFT_EN BIT(31) -+#define AR934X_SPI_SHIFT_CS(n) BIT(28 + (n)) -+#define AR934X_SPI_SHIFT_TERM 26 -+#define AR934X_SPI_SHIFT_VAL(cs, term, count) \ -+ (AR934X_SPI_SHIFT_EN | AR934X_SPI_SHIFT_CS(cs) | \ -+ (term) << AR934X_SPI_SHIFT_TERM | (count)) -+ -+#define AR934X_SPI_DATAIN 0x18 -+ -+struct ar934x_spi { -+ struct spi_controller *ctlr; -+ void __iomem *base; -+ struct clk *clk; -+ unsigned int clk_freq; -+}; -+ -+static inline int ar934x_spi_clk_div(struct ar934x_spi *sp, unsigned int freq) -+{ -+ int div = DIV_ROUND_UP(sp->clk_freq, freq * 2) - 1; -+ -+ if (div < 0) -+ return 0; -+ else if (div > AR934X_SPI_CLK_MASK) -+ return -EINVAL; -+ else -+ return div; -+} -+ -+static int ar934x_spi_setup(struct spi_device *spi) -+{ -+ struct ar934x_spi *sp = spi_controller_get_devdata(spi->master); -+ -+ if ((spi->max_speed_hz == 0) || -+ (spi->max_speed_hz > (sp->clk_freq / 2))) { -+ spi->max_speed_hz = sp->clk_freq / 2; -+ } else if (spi->max_speed_hz < (sp->clk_freq / 128)) { -+ dev_err(&spi->dev, "spi clock is too low\n"); -+ return -EINVAL; -+ } -+ -+ return 0; -+} -+ -+static int ar934x_spi_transfer_one_message(struct spi_controller *master, -+ struct spi_message *m) -+{ -+ struct ar934x_spi *sp = spi_controller_get_devdata(master); -+ struct spi_transfer *t = NULL; -+ struct spi_device *spi = m->spi; -+ unsigned long trx_done, trx_cur; -+ int stat = 0; -+ u8 term = 0; -+ int div, i; -+ u32 reg; -+ const u8 *tx_buf; -+ u8 *buf; -+ -+ m->actual_length = 0; -+ list_for_each_entry(t, &m->transfers, transfer_list) { -+ if (t->speed_hz) -+ div = ar934x_spi_clk_div(sp, t->speed_hz); -+ else -+ div = ar934x_spi_clk_div(sp, spi->max_speed_hz); -+ if (div < 0) { -+ stat = -EIO; -+ goto msg_done; -+ } -+ -+ reg = ioread32(sp->base + AR934X_SPI_REG_CTRL); -+ reg &= ~AR934X_SPI_CLK_MASK; -+ reg |= div; -+ iowrite32(reg, sp->base + AR934X_SPI_REG_CTRL); -+ iowrite32(0, sp->base + AR934X_SPI_DATAOUT); -+ -+ for (trx_done = 0; trx_done < t->len; trx_done += 4) { -+ trx_cur = t->len - trx_done; -+ if (trx_cur > 4) -+ trx_cur = 4; -+ else if (list_is_last(&t->transfer_list, &m->transfers)) -+ term = 1; -+ -+ if (t->tx_buf) { -+ tx_buf = t->tx_buf + trx_done; -+ reg = tx_buf[0]; -+ for (i = 1; i < trx_cur; i++) -+ reg = reg << 8 | tx_buf[i]; -+ iowrite32(reg, sp->base + AR934X_SPI_DATAOUT); -+ } -+ -+ reg = AR934X_SPI_SHIFT_VAL(spi->chip_select, term, -+ trx_cur * 8); -+ iowrite32(reg, sp->base + AR934X_SPI_REG_SHIFT_CTRL); -+ stat = readl_poll_timeout( -+ sp->base + AR934X_SPI_REG_SHIFT_CTRL, reg, -+ !(reg & AR934X_SPI_SHIFT_EN), 0, 5); -+ if (stat < 0) -+ goto msg_done; -+ -+ if (t->rx_buf) { -+ reg = ioread32(sp->base + AR934X_SPI_DATAIN); -+ buf = t->rx_buf + trx_done; -+ for (i = 0; i < trx_cur; i++) { -+ buf[trx_cur - i - 1] = reg & 0xff; -+ reg >>= 8; -+ } -+ } -+ } -+ m->actual_length += t->len; -+ } -+ -+msg_done: -+ m->status = stat; -+ spi_finalize_current_message(master); -+ -+ return 0; -+} -+ -+static const struct of_device_id ar934x_spi_match[] = { -+ { .compatible = "qca,ar934x-spi" }, -+ {}, -+}; -+MODULE_DEVICE_TABLE(of, ar934x_spi_match); -+ -+static int ar934x_spi_probe(struct platform_device *pdev) -+{ -+ struct spi_controller *ctlr; -+ struct ar934x_spi *sp; -+ void __iomem *base; -+ struct clk *clk; -+ int ret; -+ -+ base = devm_platform_ioremap_resource(pdev, 0); -+ if (IS_ERR(base)) -+ return PTR_ERR(base); -+ -+ clk = devm_clk_get(&pdev->dev, NULL); -+ if (IS_ERR(clk)) { -+ dev_err(&pdev->dev, "failed to get clock\n"); -+ return PTR_ERR(clk); -+ } -+ -+ ret = clk_prepare_enable(clk); -+ if (ret) -+ return ret; -+ -+ ctlr = spi_alloc_master(&pdev->dev, sizeof(*sp)); -+ if (!ctlr) { -+ dev_info(&pdev->dev, "failed to allocate spi controller\n"); -+ return -ENOMEM; -+ } -+ -+ /* disable flash mapping and expose spi controller registers */ -+ iowrite32(AR934X_SPI_ENABLE, base + AR934X_SPI_REG_FS); -+ /* restore pins to default state: CSn=1 DO=CLK=0 */ -+ iowrite32(AR934X_SPI_IOC_INITVAL, base + AR934X_SPI_REG_IOC); -+ -+ ctlr->mode_bits = SPI_LSB_FIRST; -+ ctlr->setup = ar934x_spi_setup; -+ ctlr->transfer_one_message = ar934x_spi_transfer_one_message; -+ ctlr->bits_per_word_mask = SPI_BPW_MASK(8); -+ ctlr->dev.of_node = pdev->dev.of_node; -+ ctlr->num_chipselect = 3; -+ -+ dev_set_drvdata(&pdev->dev, ctlr); -+ -+ sp = spi_controller_get_devdata(ctlr); -+ sp->base = base; -+ sp->clk = clk; -+ sp->clk_freq = clk_get_rate(clk); -+ sp->ctlr = ctlr; -+ -+ return devm_spi_register_controller(&pdev->dev, ctlr); -+} -+ -+static int ar934x_spi_remove(struct platform_device *pdev) -+{ -+ struct spi_controller *ctlr; -+ struct ar934x_spi *sp; -+ -+ ctlr = dev_get_drvdata(&pdev->dev); -+ sp = spi_controller_get_devdata(ctlr); -+ -+ clk_disable_unprepare(sp->clk); -+ -+ return 0; -+} -+ -+static struct platform_driver ar934x_spi_driver = { -+ .driver = { -+ .name = DRIVER_NAME, -+ .of_match_table = ar934x_spi_match, -+ }, -+ .probe = ar934x_spi_probe, -+ .remove = ar934x_spi_remove, -+}; -+ -+module_platform_driver(ar934x_spi_driver); -+ -+MODULE_DESCRIPTION("SPI controller driver for Qualcomm Atheros AR934x/QCA95xx"); -+MODULE_AUTHOR("Chuanhong Guo <gch981213@gmail.com>"); -+MODULE_LICENSE("GPL v2"); -+MODULE_ALIAS("platform:" DRIVER_NAME); |