--- /dev/null
+From a59f3fa1dd4cb284171a53cb7a614ad947c544f6 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Wed, 13 Aug 2014 14:11:39 +0200
+Subject: [PATCH V2] spi: bcm53xx: driver for SPI controller on Broadcom bcma
+ SoC
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Broadcom 53xx ARM SoCs use bcma bus that contains various cores (AKA
+devices). If board has a serial flash, it's connected over SPI and the
+bcma bus includes a SPI controller. Example log from such a board:
+bus0: Found chip with id 53010, rev 0x00 and package 0x02
+(...)
+bus0: Core 18 found: SPI flash controller (manuf 0x4BF, id 0x50A, rev 0x01, class 0x0)
+
+This patch adds a bcma driver for SPI core, it registers SPI master
+controller and "bcm53xxspiflash" SPI device.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+---
+Since RFC: Add Signed-off-by
+ Update to compile on top of for-next
+V2: Use wait timeout
+ Describe bcm53xxspi_calc_timeout a bit
+ Use devm_spi_register_master
+
+Thanks Mark for your comments!
+---
+ drivers/spi/Kconfig | 6 +
+ drivers/spi/Makefile | 1 +
+ drivers/spi/spi-bcm53xx.c | 295 ++++++++++++++++++++++++++++++++++++++++++++++
+ drivers/spi/spi-bcm53xx.h | 72 +++++++++++
+ 4 files changed, 374 insertions(+)
+ create mode 100644 drivers/spi/spi-bcm53xx.c
+ create mode 100644 drivers/spi/spi-bcm53xx.h
+
+--- a/drivers/spi/Kconfig
++++ b/drivers/spi/Kconfig
+@@ -112,6 +112,12 @@ config SPI_AU1550
+ If you say yes to this option, support will be included for the
+ PSC SPI controller found on Au1550, Au1200 and Au1300 series.
+
++config SPI_BCM53XX
++ tristate "Broadcom BCM53xx SPI controller"
++ depends on ARCH_BCM_5301X
++ help
++ Enable support for the SPI controller on Broadcom BCM53xx ARM SoCs.
++
+ config SPI_BCM63XX
+ tristate "Broadcom BCM63xx SPI controller"
+ depends on BCM63XX
+--- 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_BCM2835) += spi-bcm2835.o
++obj-$(CONFIG_SPI_BCM53XX) += spi-bcm53xx.o
+ obj-$(CONFIG_SPI_BCM63XX) += spi-bcm63xx.o
+ obj-$(CONFIG_SPI_BCM63XX_HSSPI) += spi-bcm63xx-hsspi.o
+ obj-$(CONFIG_SPI_BFIN5XX) += spi-bfin5xx.o
+--- /dev/null
++++ b/drivers/spi/spi-bcm53xx.c
+@@ -0,0 +1,295 @@
++#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/slab.h>
++#include <linux/delay.h>
++#include <linux/bcma/bcma.h>
++#include <linux/spi/spi.h>
++
++#include "spi-bcm53xx.h"
++
++#define BCM53XXSPI_MAX_SPI_BAUD 13500000 /* 216 MHz? */
++
++/* The longest observed required wait was 19 ms */
++#define BCM53XXSPI_SPE_TIMEOUT_MS 80
++
++struct bcm53xxspi {
++ struct bcma_device *core;
++ struct spi_master *master;
++
++ size_t read_offset;
++};
++
++static inline u32 bcm53xxspi_read(struct bcm53xxspi *b53spi, u16 offset)
++{
++ return bcma_read32(b53spi->core, offset);
++}
++
++static inline void bcm53xxspi_write(struct bcm53xxspi *b53spi, u16 offset,
++ u32 value)
++{
++ bcma_write32(b53spi->core, offset, value);
++}
++
++static inline unsigned int bcm53xxspi_calc_timeout(size_t len)
++{
++ /* Do some magic calculation based on length and buad. Add 10% and 1. */
++ return (len * 9000 / BCM53XXSPI_MAX_SPI_BAUD * 110 / 100) + 1;
++}
++
++static int bcm53xxspi_wait(struct bcm53xxspi *b53spi, unsigned int timeout_ms)
++{
++ unsigned long deadline;
++ u32 tmp;
++
++ /* SPE bit has to be 0 before we read MSPI STATUS */
++ deadline = jiffies + BCM53XXSPI_SPE_TIMEOUT_MS * HZ / 1000;
++ do {
++ tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_SPCR2);
++ if (!(tmp & B53SPI_MSPI_SPCR2_SPE))
++ break;
++ udelay(5);
++ } while (!time_after_eq(jiffies, deadline));
++
++ if (tmp & B53SPI_MSPI_SPCR2_SPE)
++ goto spi_timeout;
++
++ /* Check status */
++ deadline = jiffies + timeout_ms * HZ / 1000;
++ do {
++ tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_MSPI_STATUS);
++ if (tmp & B53SPI_MSPI_MSPI_STATUS_SPIF) {
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_MSPI_STATUS, 0);
++ return 0;
++ }
++
++ cpu_relax();
++ udelay(100);
++ } while (!time_after_eq(jiffies, deadline));
++
++spi_timeout:
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_MSPI_STATUS, 0);
++
++ pr_err("Timeout waiting for SPI to be ready!\n");
++
++ return -EBUSY;
++}
++
++static void bcm53xxspi_buf_write(struct bcm53xxspi *b53spi, u8 *w_buf,
++ size_t len, bool cont)
++{
++ u32 tmp;
++ int i;
++
++ for (i = 0; i < len; i++) {
++ /* Transmit Register File MSB */
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_TXRAM + 4 * (i * 2),
++ (unsigned int)w_buf[i]);
++ }
++
++ for (i = 0; i < len; i++) {
++ tmp = B53SPI_CDRAM_CONT | B53SPI_CDRAM_PCS_DISABLE_ALL |
++ B53SPI_CDRAM_PCS_DSCK;
++ if (!cont && i == len - 1)
++ tmp &= ~B53SPI_CDRAM_CONT;
++ tmp &= ~0x1;
++ /* Command Register File */
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_CDRAM + 4 * i, tmp);
++ }
++
++ /* Set queue pointers */
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_NEWQP, 0);
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_ENDQP, len - 1);
++
++ if (cont)
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 1);
++
++ /* Start SPI transfer */
++ tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_SPCR2);
++ tmp |= B53SPI_MSPI_SPCR2_SPE;
++ if (cont)
++ tmp |= B53SPI_MSPI_SPCR2_CONT_AFTER_CMD;
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_SPCR2, tmp);
++
++ /* Wait for SPI to finish */
++ bcm53xxspi_wait(b53spi, bcm53xxspi_calc_timeout(len));
++
++ if (!cont)
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 0);
++
++ b53spi->read_offset = len;
++}
++
++static void bcm53xxspi_buf_read(struct bcm53xxspi *b53spi, u8 *r_buf,
++ size_t len, bool cont)
++{
++ u32 tmp;
++ int i;
++
++ for (i = 0; i < b53spi->read_offset + len; i++) {
++ tmp = B53SPI_CDRAM_CONT | B53SPI_CDRAM_PCS_DISABLE_ALL |
++ B53SPI_CDRAM_PCS_DSCK;
++ if (!cont && i == b53spi->read_offset + len - 1)
++ tmp &= ~B53SPI_CDRAM_CONT;
++ tmp &= ~0x1;
++ /* Command Register File */
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_CDRAM + 4 * i, tmp);
++ }
++
++ /* Set queue pointers */
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_NEWQP, 0);
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_ENDQP,
++ b53spi->read_offset + len - 1);
++
++ if (cont)
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 1);
++
++ /* Start SPI transfer */
++ tmp = bcm53xxspi_read(b53spi, B53SPI_MSPI_SPCR2);
++ tmp |= B53SPI_MSPI_SPCR2_SPE;
++ if (cont)
++ tmp |= B53SPI_MSPI_SPCR2_CONT_AFTER_CMD;
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_SPCR2, tmp);
++
++ /* Wait for SPI to finish */
++ bcm53xxspi_wait(b53spi, bcm53xxspi_calc_timeout(len));
++
++ if (!cont)
++ bcm53xxspi_write(b53spi, B53SPI_MSPI_WRITE_LOCK, 0);
++
++ for (i = 0; i < len; ++i) {
++ int offset = b53spi->read_offset + i;
++
++ /* Data stored in the transmit register file LSB */
++ r_buf[i] = (u8)bcm53xxspi_read(b53spi, B53SPI_MSPI_RXRAM + 4 * (1 + offset * 2));
++ }
++
++ b53spi->read_offset = 0;
++}
++
++static int bcm53xxspi_transfer_one(struct spi_master *master,
++ struct spi_device *spi,
++ struct spi_transfer *t)
++{
++ struct bcm53xxspi *b53spi = spi_master_get_devdata(master);
++ u8 *buf;
++ size_t left;
++
++ if (t->tx_buf) {
++ buf = (u8 *)t->tx_buf;
++ left = t->len;
++ while (left) {
++ size_t to_write = min_t(size_t, 16, left);
++ bool cont = left - to_write > 0;
++
++ bcm53xxspi_buf_write(b53spi, buf, to_write, cont);
++ left -= to_write;
++ buf += to_write;
++ }
++ }
++
++ if (t->rx_buf) {
++ buf = (u8 *)t->rx_buf;
++ left = t->len;
++ while (left) {
++ size_t to_read = min_t(size_t, 16 - b53spi->read_offset,
++ left);
++ bool cont = left - to_read > 0;
++
++ bcm53xxspi_buf_read(b53spi, buf, to_read, cont);
++ left -= to_read;
++ buf += to_read;
++ }
++ }
++
++ return 0;
++}
++
++/**************************************************
++ * BCMA
++ **************************************************/
++
++struct spi_board_info bcm53xx_info = {
++ .modalias = "bcm53xxspiflash",
++};
++
++static const struct bcma_device_id bcm53xxspi_bcma_tbl[] = {
++ BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_NS_QSPI, BCMA_ANY_REV, BCMA_ANY_CLASS),
++ BCMA_CORETABLE_END
++};
++MODULE_DEVICE_TABLE(bcma, bcm53xxspi_bcma_tbl);
++
++static int bcm53xxspi_bcma_probe(struct bcma_device *core)
++{
++ struct bcm53xxspi *b53spi;
++ struct spi_master *master;
++ int err;
++
++ if (core->bus->drv_cc.core->id.rev != 42) {
++ pr_err("SPI on SoC with unsupported ChipCommon rev\n");
++ return -ENOTSUPP;
++ }
++
++ master = spi_alloc_master(&core->dev, sizeof(*b53spi));
++ if (!master)
++ return -ENOMEM;
++
++ b53spi = spi_master_get_devdata(master);
++ b53spi->master = master;
++ b53spi->core = core;
++
++ master->transfer_one = bcm53xxspi_transfer_one;
++
++ bcma_set_drvdata(core, b53spi);
++
++ err = devm_spi_register_master(&core->dev, master);
++ if (err) {
++ spi_master_put(master);
++ bcma_set_drvdata(core, NULL);
++ goto out;
++ }
++
++ /* Broadcom SoCs (at least with the CC rev 42) use SPI for flash only */
++ spi_new_device(master, &bcm53xx_info);
++
++out:
++ return err;
++}
++
++static void bcm53xxspi_bcma_remove(struct bcma_device *core)
++{
++ struct bcm53xxspi *b53spi = bcma_get_drvdata(core);
++
++ spi_unregister_master(b53spi->master);
++}
++
++static struct bcma_driver bcm53xxspi_bcma_driver = {
++ .name = KBUILD_MODNAME,
++ .id_table = bcm53xxspi_bcma_tbl,
++ .probe = bcm53xxspi_bcma_probe,
++ .remove = bcm53xxspi_bcma_remove,
++};
++
++/**************************************************
++ * Init & exit
++ **************************************************/
++
++static int __init bcm53xxspi_module_init(void)
++{
++ int err = 0;
++
++ err = bcma_driver_register(&bcm53xxspi_bcma_driver);
++ if (err)
++ pr_err("Failed to register bcma driver: %d\n", err);
++
++ return err;
++}
++
++static void __exit bcm53xxspi_module_exit(void)
++{
++ bcma_driver_unregister(&bcm53xxspi_bcma_driver);
++}
++
++module_init(bcm53xxspi_module_init);
++module_exit(bcm53xxspi_module_exit);
+--- /dev/null
++++ b/drivers/spi/spi-bcm53xx.h
+@@ -0,0 +1,72 @@
++#ifndef SPI_BCM53XX_H
++#define SPI_BCM53XX_H
++
++#define B53SPI_BSPI_REVISION_ID 0x000
++#define B53SPI_BSPI_SCRATCH 0x004
++#define B53SPI_BSPI_MAST_N_BOOT_CTRL 0x008
++#define B53SPI_BSPI_BUSY_STATUS 0x00c
++#define B53SPI_BSPI_INTR_STATUS 0x010
++#define B53SPI_BSPI_B0_STATUS 0x014
++#define B53SPI_BSPI_B0_CTRL 0x018
++#define B53SPI_BSPI_B1_STATUS 0x01c
++#define B53SPI_BSPI_B1_CTRL 0x020
++#define B53SPI_BSPI_STRAP_OVERRIDE_CTRL 0x024
++#define B53SPI_BSPI_FLEX_MODE_ENABLE 0x028
++#define B53SPI_BSPI_BITS_PER_CYCLE 0x02c
++#define B53SPI_BSPI_BITS_PER_PHASE 0x030
++#define B53SPI_BSPI_CMD_AND_MODE_BYTE 0x034
++#define B53SPI_BSPI_BSPI_FLASH_UPPER_ADDR_BYTE 0x038
++#define B53SPI_BSPI_BSPI_XOR_VALUE 0x03c
++#define B53SPI_BSPI_BSPI_XOR_ENABLE 0x040
++#define B53SPI_BSPI_BSPI_PIO_MODE_ENABLE 0x044
++#define B53SPI_BSPI_BSPI_PIO_IODIR 0x048
++#define B53SPI_BSPI_BSPI_PIO_DATA 0x04c
++
++/* RAF */
++#define B53SPI_RAF_START_ADDR 0x100
++#define B53SPI_RAF_NUM_WORDS 0x104
++#define B53SPI_RAF_CTRL 0x108
++#define B53SPI_RAF_FULLNESS 0x10c
++#define B53SPI_RAF_WATERMARK 0x110
++#define B53SPI_RAF_STATUS 0x114
++#define B53SPI_RAF_READ_DATA 0x118
++#define B53SPI_RAF_WORD_CNT 0x11c
++#define B53SPI_RAF_CURR_ADDR 0x120
++
++/* MSPI */
++#define B53SPI_MSPI_SPCR0_LSB 0x200
++#define B53SPI_MSPI_SPCR0_MSB 0x204
++#define B53SPI_MSPI_SPCR1_LSB 0x208
++#define B53SPI_MSPI_SPCR1_MSB 0x20c
++#define B53SPI_MSPI_NEWQP 0x210
++#define B53SPI_MSPI_ENDQP 0x214
++#define B53SPI_MSPI_SPCR2 0x218
++#define B53SPI_MSPI_SPCR2_SPE 0x00000040
++#define B53SPI_MSPI_SPCR2_CONT_AFTER_CMD 0x00000080
++#define B53SPI_MSPI_MSPI_STATUS 0x220
++#define B53SPI_MSPI_MSPI_STATUS_SPIF 0x00000001
++#define B53SPI_MSPI_CPTQP 0x224
++#define B53SPI_MSPI_TXRAM 0x240 /* 32 registers, up to 0x2b8 */
++#define B53SPI_MSPI_RXRAM 0x2c0 /* 32 registers, up to 0x33c */
++#define B53SPI_MSPI_CDRAM 0x340 /* 16 registers, up to 0x37c */
++#define B53SPI_CDRAM_PCS_PCS0 0x00000001
++#define B53SPI_CDRAM_PCS_PCS1 0x00000002
++#define B53SPI_CDRAM_PCS_PCS2 0x00000004
++#define B53SPI_CDRAM_PCS_PCS3 0x00000008
++#define B53SPI_CDRAM_PCS_DISABLE_ALL 0x0000000f
++#define B53SPI_CDRAM_PCS_DSCK 0x00000010
++#define B53SPI_CDRAM_BITSE 0x00000040
++#define B53SPI_CDRAM_CONT 0x00000080
++#define B53SPI_MSPI_WRITE_LOCK 0x380
++#define B53SPI_MSPI_DISABLE_FLUSH_GEN 0x384
++
++/* Interrupt */
++#define B53SPI_INTR_RAF_LR_FULLNESS_REACHED 0x3a0
++#define B53SPI_INTR_RAF_LR_TRUNCATED 0x3a4
++#define B53SPI_INTR_RAF_LR_IMPATIENT 0x3a8
++#define B53SPI_INTR_RAF_LR_SESSION_DONE 0x3ac
++#define B53SPI_INTR_RAF_LR_OVERREAD 0x3b0
++#define B53SPI_INTR_MSPI_DONE 0x3b4
++#define B53SPI_INTR_MSPI_HALT_SET_TRANSACTION_DONE 0x3b8
++
++#endif /* SPI_BCM53XX_H */
projects / openwrt / staging / mkresin.git / commitdiff