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openwrt/target/linux/brcm63xx/patches-3.3/419-SPI-MIPS-BCM63XX-Add-HS-SPI-driver.patch
Jonas Gorski e34018cc9e bcm63xx: add support for the HSSPI controller 
Add support for the HSSPI controller found on bcm6328 and SPI attached
flash.

SVN-Revision: 31879
2012-05-27 13:22:33 +00:00

760 lines
22 KiB
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From 2982127b8a0127667cb5354e03987cd3baa84b8c Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Sat, 12 Nov 2011 12:19:55 +0100
Subject: [PATCH 54/79] SPI: MIPS: BCM63XX: Add HS SPI driver
Add a driver for the High Speed SPI controller found on newer BCM63XX SoCs.
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h | 18 +
.../include/asm/mach-bcm63xx/bcm63xx_dev_hsspi.h | 3 +
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h | 47 ++
drivers/spi/Kconfig | 7 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-bcm63xx-hsspi.c | 502 ++++++++++++++++++++
6 files changed, 578 insertions(+)
create mode 100644 drivers/spi/spi-bcm63xx-hsspi.c
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
@@ -116,6 +116,7 @@ enum bcm63xx_regs_set {
RSET_UART1,
RSET_GPIO,
RSET_SPI,
+ RSET_HSSPI,
RSET_UDC0,
RSET_OHCI0,
RSET_OHCI_PRIV,
@@ -161,6 +162,7 @@ enum bcm63xx_regs_set {
#define RSET_ENETDMAS_SIZE(chans) (16 * (chans))
#define RSET_ENETSW_SIZE 65536
#define RSET_UART_SIZE 24
+#define RSET_HSSPI_SIZE 2048
#define RSET_UDC_SIZE 256
#define RSET_OHCI_SIZE 256
#define RSET_EHCI_SIZE 256
@@ -184,6 +186,7 @@ enum bcm63xx_regs_set {
#define BCM_6328_UART1_BASE (0xb0000120)
#define BCM_6328_GPIO_BASE (0xb0000080)
#define BCM_6328_SPI_BASE (0xdeadbeef)
+#define BCM_6328_HSSPI_BASE (0xb0001000)
#define BCM_6328_UDC0_BASE (0xdeadbeef)
#define BCM_6328_USBDMA_BASE (0xdeadbeef)
#define BCM_6328_OHCI0_BASE (0xdeadbeef)
@@ -229,6 +232,7 @@ enum bcm63xx_regs_set {
#define BCM_6338_UART1_BASE (0xdeadbeef)
#define BCM_6338_GPIO_BASE (0xfffe0400)
#define BCM_6338_SPI_BASE (0xfffe0c00)
+#define BCM_6338_HSSPI_BASE (0xdeadbeef)
#define BCM_6338_UDC0_BASE (0xdeadbeef)
#define BCM_6338_USBDMA_BASE (0xfffe2400)
#define BCM_6338_OHCI0_BASE (0xdeadbeef)
@@ -275,6 +279,7 @@ enum bcm63xx_regs_set {
#define BCM_6345_UART1_BASE (0xdeadbeef)
#define BCM_6345_GPIO_BASE (0xfffe0400)
#define BCM_6345_SPI_BASE (0xdeadbeef)
+#define BCM_6345_HSSPI_BASE (0xdeadbeef)
#define BCM_6345_UDC0_BASE (0xdeadbeef)
#define BCM_6345_USBDMA_BASE (0xfffe2800)
#define BCM_6345_ENET0_BASE (0xfffe1800)
@@ -320,6 +325,7 @@ enum bcm63xx_regs_set {
#define BCM_6348_UART1_BASE (0xdeadbeef)
#define BCM_6348_GPIO_BASE (0xfffe0400)
#define BCM_6348_SPI_BASE (0xfffe0c00)
+#define BCM_6348_HSSPI_BASE (0xdeadbeef)
#define BCM_6348_UDC0_BASE (0xfffe1000)
#define BCM_6348_OHCI0_BASE (0xfffe1b00)
#define BCM_6348_OHCI_PRIV_BASE (0xfffe1c00)
@@ -363,6 +369,7 @@ enum bcm63xx_regs_set {
#define BCM_6358_UART1_BASE (0xfffe0120)
#define BCM_6358_GPIO_BASE (0xfffe0080)
#define BCM_6358_SPI_BASE (0xfffe0800)
+#define BCM_6358_HSSPI_BASE (0xdeadbeef)
#define BCM_6358_UDC0_BASE (0xfffe0800)
#define BCM_6358_OHCI0_BASE (0xfffe1400)
#define BCM_6358_OHCI_PRIV_BASE (0xdeadbeef)
@@ -407,6 +414,7 @@ enum bcm63xx_regs_set {
#define BCM_6368_UART1_BASE (0xb0000120)
#define BCM_6368_GPIO_BASE (0xb0000080)
#define BCM_6368_SPI_BASE (0xb0000800)
+#define BCM_6368_HSSPI_BASE (0xdeadbeef)
#define BCM_6368_UDC0_BASE (0xdeadbeef)
#define BCM_6368_OHCI0_BASE (0xb0001600)
#define BCM_6368_OHCI_PRIV_BASE (0xdeadbeef)
@@ -456,6 +464,7 @@ extern const unsigned long *bcm63xx_regs
__GEN_RSET_BASE(__cpu, UART1) \
__GEN_RSET_BASE(__cpu, GPIO) \
__GEN_RSET_BASE(__cpu, SPI) \
+ __GEN_RSET_BASE(__cpu, HSSPI) \
__GEN_RSET_BASE(__cpu, UDC0) \
__GEN_RSET_BASE(__cpu, OHCI0) \
__GEN_RSET_BASE(__cpu, OHCI_PRIV) \
@@ -497,6 +506,7 @@ extern const unsigned long *bcm63xx_regs
[RSET_UART1] = BCM_## __cpu ##_UART1_BASE, \
[RSET_GPIO] = BCM_## __cpu ##_GPIO_BASE, \
[RSET_SPI] = BCM_## __cpu ##_SPI_BASE, \
+ [RSET_HSSPI] = BCM_## __cpu ##_HSSPI_BASE, \
[RSET_UDC0] = BCM_## __cpu ##_UDC0_BASE, \
[RSET_OHCI0] = BCM_## __cpu ##_OHCI0_BASE, \
[RSET_OHCI_PRIV] = BCM_## __cpu ##_OHCI_PRIV_BASE, \
@@ -569,6 +579,7 @@ enum bcm63xx_irq {
IRQ_ENET0,
IRQ_ENET1,
IRQ_ENET_PHY,
+ IRQ_HSSPI,
IRQ_OHCI0,
IRQ_EHCI0,
IRQ_ENET0_RXDMA,
@@ -604,6 +615,7 @@ enum bcm63xx_irq {
#define BCM_6328_ENET0_IRQ 0
#define BCM_6328_ENET1_IRQ 0
#define BCM_6328_ENET_PHY_IRQ (IRQ_INTERNAL_BASE + 12)
+#define BCM_6328_HSSPI_IRQ (IRQ_INTERNAL_BASE + 29)
#define BCM_6328_OHCI0_IRQ (IRQ_INTERNAL_BASE + 9)
#define BCM_6328_EHCI0_IRQ (IRQ_INTERNAL_BASE + 10)
#define BCM_6328_PCMCIA_IRQ 0
@@ -642,6 +654,7 @@ enum bcm63xx_irq {
#define BCM_6338_ENET0_IRQ (IRQ_INTERNAL_BASE + 8)
#define BCM_6338_ENET1_IRQ 0
#define BCM_6338_ENET_PHY_IRQ (IRQ_INTERNAL_BASE + 9)
+#define BCM_6338_HSSPI_IRQ 0
#define BCM_6338_OHCI0_IRQ 0
#define BCM_6338_EHCI0_IRQ 0
#define BCM_6338_ENET0_RXDMA_IRQ (IRQ_INTERNAL_BASE + 15)
@@ -673,6 +686,7 @@ enum bcm63xx_irq {
#define BCM_6345_ENET0_IRQ (IRQ_INTERNAL_BASE + 8)
#define BCM_6345_ENET1_IRQ 0
#define BCM_6345_ENET_PHY_IRQ (IRQ_INTERNAL_BASE + 12)
+#define BCM_6345_HSSPI_IRQ 0
#define BCM_6345_OHCI0_IRQ 0
#define BCM_6345_EHCI0_IRQ 0
#define BCM_6345_ENET0_RXDMA_IRQ (IRQ_INTERNAL_BASE + 13 + 1)
@@ -704,6 +718,7 @@ enum bcm63xx_irq {
#define BCM_6348_ENET0_IRQ (IRQ_INTERNAL_BASE + 8)
#define BCM_6348_ENET1_IRQ (IRQ_INTERNAL_BASE + 7)
#define BCM_6348_ENET_PHY_IRQ (IRQ_INTERNAL_BASE + 9)
+#define BCM_6348_HSSPI_IRQ 0
#define BCM_6348_OHCI0_IRQ (IRQ_INTERNAL_BASE + 12)
#define BCM_6348_EHCI0_IRQ 0
#define BCM_6348_ENET0_RXDMA_IRQ (IRQ_INTERNAL_BASE + 20)
@@ -735,6 +750,7 @@ enum bcm63xx_irq {
#define BCM_6358_ENET0_IRQ (IRQ_INTERNAL_BASE + 8)
#define BCM_6358_ENET1_IRQ (IRQ_INTERNAL_BASE + 6)
#define BCM_6358_ENET_PHY_IRQ (IRQ_INTERNAL_BASE + 9)
+#define BCM_6358_HSSPI_IRQ 0
#define BCM_6358_OHCI0_IRQ (IRQ_INTERNAL_BASE + 5)
#define BCM_6358_EHCI0_IRQ (IRQ_INTERNAL_BASE + 10)
#define BCM_6358_ENET0_RXDMA_IRQ (IRQ_INTERNAL_BASE + 15)
@@ -775,6 +791,7 @@ enum bcm63xx_irq {
#define BCM_6368_ENET0_IRQ 0
#define BCM_6368_ENET1_IRQ 0
#define BCM_6368_ENET_PHY_IRQ (IRQ_INTERNAL_BASE + 15)
+#define BCM_6368_HSSPI_IRQ 0
#define BCM_6368_OHCI0_IRQ (IRQ_INTERNAL_BASE + 5)
#define BCM_6368_EHCI0_IRQ (IRQ_INTERNAL_BASE + 7)
#define BCM_6368_PCMCIA_IRQ 0
@@ -815,6 +832,7 @@ extern const int *bcm63xx_irqs;
[IRQ_ENET0] = BCM_## __cpu ##_ENET0_IRQ, \
[IRQ_ENET1] = BCM_## __cpu ##_ENET1_IRQ, \
[IRQ_ENET_PHY] = BCM_## __cpu ##_ENET_PHY_IRQ, \
+ [IRQ_HSSPI] = BCM_## __cpu ##_HSSPI_IRQ, \
[IRQ_OHCI0] = BCM_## __cpu ##_OHCI0_IRQ, \
[IRQ_EHCI0] = BCM_## __cpu ##_EHCI0_IRQ, \
[IRQ_ENET0_RXDMA] = BCM_## __cpu ##_ENET0_RXDMA_IRQ, \
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_hsspi.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_hsspi.h
@@ -23,4 +23,7 @@ struct bcm63xx_hsspi_pdata {
#define HSSPI_OP_WRITE (2 << HSSPI_OP_CODE_SHIFT)
#define HSSPI_OP_READ (3 << HSSPI_OP_CODE_SHIFT)
+#define HS_SPI_CLOCK_DEF 40000000
+#define HS_SPI_BUFFER_LEN 512
+
#endif /* BCM63XX_DEV_HSSPI_H */
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
@@ -1276,4 +1276,51 @@
#define PCIE_DEVICE_OFFSET 0x8000
+/*************************************************************************
+ * _REG relative to RSET_HSSPI
+ *************************************************************************/
+
+#define HSSPI_GLOBAL_CTRL_REG 0x0
+#define GLOBAL_CTRL_CLK_POLARITY BIT(17)
+#define GLOBAL_CTRL_CLK_GATE_SSOFF BIT(16)
+
+#define HSSPI_GLOBAL_EXT_TRIGGER_REG 0x4
+
+#define HSSPI_INT_STATUS_REG 0x8
+#define HSSPI_INT_STATUS_MASKED_REG 0xc
+#define HSSPI_INT_MASK_REG 0x10
+
+#define HSSPI_PING0_CMD_DONE BIT(0)
+
+#define HSSPI_INT_CLEAR_ALL 0xff001f1f
+
+#define HSSPI_PINGPONG_COMMAND_REG(x) (0x80 + (x) * 0x40)
+#define PINGPONG_CMD_COMMAND_MASK 0xf
+#define PINGPONG_COMMAND_NOOP 0
+#define PINGPONG_COMMAND_START_NOW 1
+#define PINGPONG_COMMAND_START_TRIGGER 2
+#define PINGPONG_COMMAND_HALT 3
+#define PINGPONG_COMMAND_FLUSH 4
+#define PINGPONG_CMD_PROFILE_SHIFT 8
+#define PINGPONG_CMD_SS_SHIFT 12
+
+#define HSSPI_PINGPONG_STATUS_REG(x) (0x84 + (x) * 0x40)
+
+#define HSSPI_PROFILE_CLK_CTRL_REG(x) (0x100 + (x) * 0x20)
+#define CLK_CTRL_ACCUM_RST_ON_LOOP BIT(15)
+
+#define HSSPI_PROFILE_SIGNAL_CTRL_REG(x) (0x104 + (x) * 0x20)
+#define SIGNAL_CTRL_LATCH_RISING BIT(12)
+#define SIGNAL_CTRL_LAUNCH_RISING BIT(13)
+#define SIGNAL_CTRL_ASYNC_INPUT_PATH BIT(16)
+
+#define HSSPI_PROFILE_MODE_CTRL_REG(x) (0x108 + (x) * 0x20)
+#define MODE_CTRL_MULTIDATA_RD_STRT_SHIFT 8
+#define MODE_CTRL_MULTIDATA_WR_STRT_SHIFT 12
+#define MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT 16
+#define MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT 18
+#define MODE_CTRL_PREPENDBYTE_CNT_SHIFT 24
+
+#define HSSPI_FIFO_REG(x) (0x200 + (x) * 0x200)
+
#endif /* BCM63XX_REGS_H_ */
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -100,6 +100,13 @@ config SPI_BCM63XX
help
Enable support for the SPI controller on the Broadcom BCM63xx SoCs.
+config SPI_BCM63XX_HSSPI
+ tristate "Broadcom BCM63XX HS SPI controller driver"
+ depends on BCM63XX
+ help
+ This enables support for the High Speed SPI controller present on
+ newer Broadcom BCM63XX SoCs.
+
config SPI_BITBANG
tristate "Utilities for Bitbanging SPI masters"
help
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_SPI_ATMEL) += spi-atmel.o
obj-$(CONFIG_SPI_ATH79) += spi-ath79.o
obj-$(CONFIG_SPI_AU1550) += spi-au1550.o
obj-$(CONFIG_SPI_BCM63XX) += spi-bcm63xx.o
+obj-$(CONFIG_SPI_BCM63XX_HSSPI) += spi-bcm63xx-hsspi.o
obj-$(CONFIG_SPI_BFIN) += spi-bfin5xx.o
obj-$(CONFIG_SPI_BFIN_SPORT) += spi-bfin-sport.o
obj-$(CONFIG_SPI_BITBANG) += spi-bitbang.o
--- /dev/null
+++ b/drivers/spi/spi-bcm63xx-hsspi.c
@@ -0,0 +1,502 @@
+/*
+ * Broadcom BCM63XX High Speed SPI Controller driver
+ *
+ * Copyright 2000-2010 Broadcom Corporation
+ * Copyright 2011 Jonas Gorski <jonas.gorski@gmail.com>
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/spi/spi.h>
+#include <linux/workqueue.h>
+
+#include <bcm63xx_regs.h>
+#include <bcm63xx_dev_hsspi.h>
+
+
+#define PFX KBUILD_MODNAME
+
+struct bcm63xx_hsspi {
+ spinlock_t lock;
+ int irq;
+ u8 stopping;
+
+ struct list_head queue;
+ struct workqueue_struct *workqueue;
+ struct work_struct ws;
+ struct completion done;
+
+ struct spi_transfer *curr_trans;
+
+ struct platform_device *pdev;
+ void __iomem *regs;
+ struct clk *clk;
+
+ /* Platform data */
+ u32 speed_hz;
+
+ /* data iomem */
+ u8 __iomem *fifo;
+
+
+};
+
+static void bcm63xx_hsspi_set_clk(struct bcm63xx_hsspi *bs, int hz,
+ int profile)
+{
+ int clock;
+
+ clock = bs->speed_hz / hz;
+ if (bs->speed_hz % HS_SPI_CLOCK_DEF)
+ clock++;
+
+ clock = 2048 / clock;
+ if (2048 % clock)
+ clock++;
+
+ bcm_hsspi_writel(CLK_CTRL_ACCUM_RST_ON_LOOP | clock,
+ HSSPI_PROFILE_CLK_CTRL_REG(profile));
+}
+
+static int bcm63xx_hsspi_do_txrx(struct spi_device *spi,
+ struct spi_transfer *t1,
+ struct spi_transfer *t2)
+{
+ struct bcm63xx_hsspi *bs = spi_master_get_devdata(spi->master);
+ u8 chip_select = spi->chip_select;
+ u16 opcode = 0;
+ int prepend_size = 0;
+
+ init_completion(&bs->done);
+ bs->curr_trans = t2 ? t2 : t1;
+ bcm63xx_hsspi_set_clk(bs, bs->curr_trans->speed_hz, chip_select);
+
+ BUG_ON(t2 && !t1->tx_buf && t1->rx_buf && t2->tx_buf && !t2->rx_buf);
+
+ if (t2 && !t2->tx_buf)
+ prepend_size = t1->len;
+
+ bcm_hsspi_writel(prepend_size<<MODE_CTRL_PREPENDBYTE_CNT_SHIFT |
+ 2<<MODE_CTRL_MULTIDATA_WR_STRT_SHIFT |
+ 2<<MODE_CTRL_MULTIDATA_RD_STRT_SHIFT | 0xff,
+ HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
+
+ if (t1->rx_buf && t1->tx_buf)
+ opcode = HSSPI_OP_READ_WRITE;
+ else if (t1->rx_buf || (t2 && t2->rx_buf))
+ opcode = HSSPI_OP_READ;
+ else if (t1->tx_buf)
+ opcode = HSSPI_OP_WRITE;
+
+ BUG_ON(opcode == 0);
+
+ if (opcode == HSSPI_OP_READ && t2)
+ opcode |= t2->len;
+ else
+ opcode |= t1->len;
+
+ if (t1->tx_buf) {
+ memcpy_toio(bs->fifo + 2, t1->tx_buf, t1->len);
+ if (t2 && t2->tx_buf) {
+ memcpy_toio(bs->fifo + 2 + t1->len,
+ t2->tx_buf, t2->len);
+ opcode += t2->len;
+ }
+ }
+
+ memcpy_toio(bs->fifo, &opcode, sizeof(opcode));
+
+ /* enable interrupt */
+ bcm_hsspi_writel(HSSPI_PING0_CMD_DONE, HSSPI_INT_MASK_REG);
+
+ /* start the transfer */
+ bcm_hsspi_writel(chip_select << PINGPONG_CMD_SS_SHIFT |
+ chip_select << PINGPONG_CMD_PROFILE_SHIFT |
+ PINGPONG_COMMAND_START_NOW,
+ HSSPI_PINGPONG_COMMAND_REG(0));
+
+ wait_for_completion(&bs->done);
+ return t1->len + (t2 ? t2->len : 0);
+}
+static int bcm63xx_hsspi_setup(struct spi_device *spi)
+{
+ struct bcm63xx_hsspi *bs;
+ u32 reg;
+ bs = spi_master_get_devdata(spi->master);
+
+ if (bs->stopping)
+ return -ESHUTDOWN;
+
+ if (!spi->bits_per_word)
+ spi->bits_per_word = 8;
+
+ if (spi->bits_per_word != 8)
+ return -EINVAL;
+
+ if (spi->max_speed_hz == 0)
+ return -EINVAL;
+
+ reg = bcm_hsspi_readl(HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select));
+ reg &= ~(SIGNAL_CTRL_LAUNCH_RISING | SIGNAL_CTRL_LATCH_RISING);
+
+ if (spi->mode & SPI_CPHA)
+ reg |= SIGNAL_CTRL_LAUNCH_RISING;
+ else
+ reg |= SIGNAL_CTRL_LATCH_RISING;
+
+ bcm_hsspi_writel(reg, HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select));
+
+ return 0;
+}
+
+
+static int bcm63xx_hsspi_transfer(struct spi_device *spi,
+ struct spi_message *msg)
+{
+ struct bcm63xx_hsspi *bs = spi_master_get_devdata(spi->master);
+ struct spi_transfer *t, *prev = NULL;
+
+ if (unlikely(list_empty(&msg->transfers)))
+ return -EINVAL;
+
+ if (bs->stopping)
+ return -ESHUTDOWN;
+
+ list_for_each_entry(t, &msg->transfers, transfer_list) {
+ /* check transfer parameters */
+ if (!t->tx_buf && !t->rx_buf)
+ return -EINVAL;
+
+ if (t->speed_hz == 0)
+ t->speed_hz = spi->max_speed_hz;
+
+ if (t->speed_hz > spi->max_speed_hz)
+ return -EINVAL;
+
+ if (t->len > HS_SPI_BUFFER_LEN)
+ return -EINVAL;
+
+ /* reject if we have to combine two tx transfers and their
+ * combined length is bigger than the buffer
+ */
+ if (prev && !prev->cs_change && !t->cs_change && prev->tx_buf &&
+ t->tx_buf && (prev->len + t->len) > HS_SPI_BUFFER_LEN)
+ return -EINVAL;
+
+ prev = t;
+ }
+
+
+ msg->actual_length = 0;
+
+#if 0
+ /* disable interrupts for the SPI controller
+ using spin_lock_irqsave would disable all interrupts */
+ bcm_hsspi_writel(0, HSSPI_INT_MASK_REG);
+#endif
+ spin_lock(&bs->lock);
+ list_add_tail(&msg->queue, &bs->queue);
+ queue_work(bs->workqueue, &bs->ws);
+ spin_unlock(&bs->lock);
+
+#if 0
+ bcm_hsspi_writel(HSSPI_PING0_CMD_DONE, HSSPI_INT_MASK_REG);
+#endif
+ return 0;
+}
+
+static void bcm63xx_hsspi_do_work(struct work_struct *work)
+{
+ struct bcm63xx_hsspi *bs = container_of(work, struct bcm63xx_hsspi,
+ ws);
+ struct spi_message *msg;
+ struct spi_transfer *prev = NULL;
+ struct spi_transfer *t;
+ u32 reg;
+
+ int len = 0;
+
+ spin_lock(&bs->lock);
+ msg = list_entry(bs->queue.next, struct spi_message, queue);
+ list_del(&msg->queue);
+ spin_unlock(&bs->lock);
+
+ if (bs->stopping) {
+ msg->status = -ESHUTDOWN;
+ goto out;
+ }
+
+ /* setup clock polarity */
+ reg = bcm_hsspi_readl(HSSPI_GLOBAL_CTRL_REG);
+ reg &= ~GLOBAL_CTRL_CLK_POLARITY;
+
+ if (msg->spi->mode & SPI_CPOL)
+ reg |= GLOBAL_CTRL_CLK_POLARITY;
+
+ bcm_hsspi_writel(reg, HSSPI_GLOBAL_CTRL_REG);
+
+ list_for_each_entry(t, &msg->transfers, transfer_list) {
+ /*
+ * This controller does not support keeping the chip select
+ * active between transfers.
+ * This logic currently supports combining:
+ * write then read with no cs_change (e.g. m25p80 RDSR)
+ * write then write with no cs_change (e.g. m25p80 PP)
+ */
+ if (prev && prev->tx_buf && !prev->cs_change && !t->cs_change) {
+ /* combine write with following transfer */
+ len += bcm63xx_hsspi_do_txrx(msg->spi, prev, t);
+ prev = NULL;
+ continue;
+ }
+
+ /* write the previous pending transfer */
+ if (prev != NULL)
+ len += bcm63xx_hsspi_do_txrx(msg->spi, prev, NULL);
+
+ prev = t;
+ }
+
+ /* do last pending transfer */
+ if (prev != NULL)
+ len += bcm63xx_hsspi_do_txrx(msg->spi, prev, NULL);
+
+ msg->status = 0;
+ msg->actual_length = len;
+out:
+ msg->complete(msg->context);
+}
+
+static irqreturn_t bcm63xx_hsspi_interrupt(int irq, void *dev_id)
+{
+ struct spi_master *master = (struct spi_master *)dev_id;
+ struct bcm63xx_hsspi *bs = spi_master_get_devdata(master);
+
+ if (bcm_hsspi_readl(HSSPI_INT_STATUS_MASKED_REG) == 0)
+ return IRQ_NONE;
+
+ bcm_hsspi_writel(HSSPI_INT_CLEAR_ALL, HSSPI_INT_STATUS_REG);
+ bcm_hsspi_writel(0, HSSPI_INT_MASK_REG);
+
+ spin_lock(&bs->lock);
+
+ if (bs->curr_trans && bs->curr_trans->rx_buf)
+ memcpy_fromio(bs->curr_trans->rx_buf, bs->fifo,
+ bs->curr_trans->len);
+
+ complete(&bs->done);
+ spin_unlock(&bs->lock);
+
+ return IRQ_HANDLED;
+}
+
+
+static void bcm63xx_hsspi_cleanup(struct spi_device *spi)
+{
+ /* would free spi_controller memory here if any was allocated */
+}
+
+static int __devinit bcm63xx_hsspi_probe(struct platform_device *pdev)
+{
+
+ struct spi_master *master;
+ struct bcm63xx_hsspi *bs;
+ struct resource *res_mem;
+ struct device *dev = &pdev->dev;
+ struct bcm63xx_hsspi_pdata *pdata = pdev->dev.platform_data;
+ struct clk *clk;
+ int irq;
+ int ret;
+
+ res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res_mem) {
+ dev_err(dev, "no iomem\n");
+ return -ENXIO;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "no irq\n");
+ return -ENXIO;
+ }
+
+ clk = clk_get(dev, "hsspi");
+
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ goto out_release;
+ }
+ clk_enable(clk);
+
+ master = spi_alloc_master(&pdev->dev, sizeof(*bs));
+ if (!master) {
+ ret = -ENOMEM;
+ goto out_disable_clk;
+ }
+
+ bs = spi_master_get_devdata(master);
+ init_completion(&bs->done);
+ bs->pdev = pdev;
+ bs->clk = clk;
+
+ bs->regs = devm_request_and_ioremap(dev, res_mem);
+ if (!bs->regs) {
+ dev_err(dev, "unable to ioremap regs\n");
+ ret = -ENOMEM;
+ goto out_put_master;
+ }
+
+ master->bus_num = pdata->bus_num;
+ master->num_chipselect = 8;
+ master->setup = bcm63xx_hsspi_setup;
+ master->transfer = bcm63xx_hsspi_transfer;
+ master->cleanup = bcm63xx_hsspi_cleanup;
+ master->mode_bits = SPI_CPOL | SPI_CPHA;
+
+ bs->speed_hz = pdata->speed_hz;
+ bs->fifo = (u8 *)(bs->regs + HSSPI_FIFO_REG(0));
+
+ platform_set_drvdata(pdev, master);
+
+ spin_lock_init(&bs->lock);
+ INIT_LIST_HEAD(&bs->queue);
+ INIT_WORK(&bs->ws, bcm63xx_hsspi_do_work);
+ bs->workqueue = create_singlethread_workqueue(pdev->name);
+ bs->curr_trans = NULL;
+
+ /* Initialize the hardware */
+ bcm_hsspi_writel(0, HSSPI_INT_MASK_REG);
+
+ bcm_hsspi_writel(bcm_hsspi_readl(HSSPI_GLOBAL_CTRL_REG) |
+ GLOBAL_CTRL_CLK_GATE_SSOFF,
+ HSSPI_GLOBAL_CTRL_REG);
+
+ ret = request_irq(irq, bcm63xx_hsspi_interrupt, IRQF_SHARED, pdev->name,
+ master);
+
+ if (ret)
+ goto out_destroy_workqueue;
+
+ spin_lock(&bs->lock);
+ bs->irq = irq;
+ spin_unlock(&bs->lock);
+
+ /* register and we are done */
+ ret = spi_register_master(master);
+ if (ret)
+ goto out_free_irq;
+
+ return 0;
+
+out_free_irq:
+ free_irq(bs->irq, master);
+out_destroy_workqueue:
+ flush_workqueue(bs->workqueue);
+ destroy_workqueue(bs->workqueue);
+ iounmap(bs->regs);
+out_put_master:
+ spi_master_put(master);
+out_disable_clk:
+ clk_disable(clk);
+ clk_put(clk);
+out_release:
+ release_mem_region(res_mem->start, resource_size(res_mem));
+
+ return ret;
+}
+
+
+static int __exit bcm63xx_hsspi_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct bcm63xx_hsspi *bs = spi_master_get_devdata(master);
+ struct spi_message *msg;
+
+ cancel_work_sync(&bs->ws);
+
+ /* reset the hardware and block queue progress */
+ bcm_hsspi_writel(0, HSSPI_INT_MASK_REG);
+
+ spin_lock(&bs->lock);
+ /* HW shutdown */
+ bs->stopping = 1;
+ spin_unlock(&bs->lock);
+
+
+ /* Terminate remaining queued transfers */
+ list_for_each_entry(msg, &bs->queue, queue) {
+ msg->status = -ESHUTDOWN;
+ msg->complete(msg->context);
+ }
+
+
+ free_irq(bs->irq, master);
+ flush_workqueue(bs->workqueue);
+ destroy_workqueue(bs->workqueue);
+
+ clk_disable(bs->clk);
+ clk_put(bs->clk);
+
+ spi_unregister_master(master);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int bcm63xx_hsspi_suspend(struct platform_device *pdev,
+ pm_message_t mesg)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct bcm63xx_hsspi *bs = spi_master_get_devdata(master);
+
+ clk_disable(bs->clk);
+
+ return 0;
+}
+
+static int bcm63xx_hsspi_resume(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct bcm63xx_hsspi *bs = spi_master_get_devdata(master);
+
+ clk_enable(bs->clk);
+
+ return 0;
+}
+
+static const struct dev_pm_ops bcm63xx_hsspi_pm_ops = {
+ .suspend = bcm63xx_hsspi_suspend,
+ .resume = bcm63xx_hsspi_resume,
+};
+
+#define BCM63XX_HSSPI_PM_OPS (&bcm63xx_hsspi_pm_ops)
+#else
+#define BCM63XX_HSSPI_PM_OPS NULL
+#endif
+
+
+
+static struct platform_driver bcm63xx_hsspi_driver = {
+ .driver = {
+ .name = "bcm63xx-hsspi",
+ .owner = THIS_MODULE,
+ .pm = BCM63XX_HSSPI_PM_OPS,
+ },
+ .probe = bcm63xx_hsspi_probe,
+ .remove = __exit_p(bcm63xx_hsspi_remove),
+};
+
+module_platform_driver(bcm63xx_hsspi_driver);
+
+MODULE_ALIAS("platform:bcm63xx_hsspi");
+MODULE_DESCRIPTION("Broadcom BCM63xx HS SPI Controller driver");
+MODULE_AUTHOR("Jonas Gorski <jonas.gorski@gmail.com>");
+MODULE_LICENSE("GPL");
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