diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-3.14/180-spi-bcm53xx-driver-for-SPI-controller-on-Broadcom-bc.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-3.14/180-spi-bcm53xx-driver-for-SPI-controller-on-Broadcom-bc.patch | 435 |
1 files changed, 435 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-3.14/180-spi-bcm53xx-driver-for-SPI-controller-on-Broadcom-bc.patch b/target/linux/bcm53xx/patches-3.14/180-spi-bcm53xx-driver-for-SPI-controller-on-Broadcom-bc.patch new file mode 100644 index 0000000000..f79e729995 --- /dev/null +++ b/target/linux/bcm53xx/patches-3.14/180-spi-bcm53xx-driver-for-SPI-controller-on-Broadcom-bc.patch @@ -0,0 +1,435 @@ +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 */ |