From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: mfe@pengutronix.de
Subject: Re: [PATCH 7/9] pbl: generalize fsl i2c_early API into pbl_i2c
Date: Mon, 8 Aug 2022 10:44:03 +0200 [thread overview]
Message-ID: <80c95dae-3b35-96c2-98fe-6abd1961d3fd@pengutronix.de> (raw)
In-Reply-To: <20220805125413.1046239-8-a.fatoum@pengutronix.de>
On 05.08.22 14:54, Ahmad Fatoum wrote:
> The prebootloader is inherently board-specific, so it's natural to
> hardcode the i2c driver used and we only support fsl_i2c at the moment
> anyway. For abstractions used by different prebootloaders though
> (e.g. PMIC writing, SPD EEPROM decoding), it would be good for generic
> code to use a pbl_i2c abstraction, so it can be reused across PBLs using
> different I2C controllers. Add such an abstraction and use it where
> appropriate.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> arch/arm/boards/ls1046ardb/lowlevel.c | 6 +++---
> arch/arm/boards/mnt-reform/lowlevel.c | 12 ++++++------
> arch/arm/boards/nxp-imx8mm-evk/lowlevel.c | 8 ++++----
> arch/arm/boards/nxp-imx8mn-evk/lowlevel.c | 16 +++++++--------
> arch/arm/boards/nxp-imx8mp-evk/lowlevel.c | 8 ++++----
> common/ddr_spd.c | 24 ++++++++++-------------
> drivers/i2c/busses/i2c-imx-early.c | 21 ++++++++++++--------
> include/ddr_spd.h | 5 ++---
> include/i2c/i2c-early.h | 13 ------------
> include/pbl/i2c.h | 21 ++++++++++++++++++++
> 10 files changed, 71 insertions(+), 63 deletions(-)
> delete mode 100644 include/i2c/i2c-early.h
> create mode 100644 include/pbl/i2c.h
>
> diff --git a/arch/arm/boards/ls1046ardb/lowlevel.c b/arch/arm/boards/ls1046ardb/lowlevel.c
> index 0a30f05aa2cb..055e5f4c9995 100644
> --- a/arch/arm/boards/ls1046ardb/lowlevel.c
> +++ b/arch/arm/boards/ls1046ardb/lowlevel.c
> @@ -5,7 +5,7 @@
> #include <ddr_spd.h>
> #include <image-metadata.h>
> #include <platform_data/mmc-esdhc-imx.h>
> -#include <i2c/i2c-early.h>
> +#include <pbl/i2c.h>
> #include <soc/fsl/fsl_ddr_sdram.h>
> #include <soc/fsl/immap_lsch2.h>
> #include <asm/barebox-arm-head.h>
> @@ -187,7 +187,7 @@ static struct fsl_ddr_info ls1046a_info = {
> static noinline __noreturn void ls1046ardb_r_entry(unsigned long memsize)
> {
> unsigned long membase = LS1046A_DDR_SDRAM_BASE;
> - struct fsl_i2c *i2c;
> + struct pbl_i2c *i2c;
> int ret;
>
> if (get_pc() >= membase) {
> @@ -205,7 +205,7 @@ static noinline __noreturn void ls1046ardb_r_entry(unsigned long memsize)
> IMD_USED_OF(fsl_ls1046a_rdb);
>
> i2c = ls1046_i2c_init(IOMEM(LSCH2_I2C1_BASE_ADDR));
> - ret = spd_read_eeprom(i2c, i2c_fsl_xfer, 0x51, &spd_eeprom);
> + ret = spd_read_eeprom(i2c, 0x51, &spd_eeprom);
> if (ret) {
> pr_err("Cannot read SPD EEPROM: %d\n", ret);
> goto err;
> diff --git a/arch/arm/boards/mnt-reform/lowlevel.c b/arch/arm/boards/mnt-reform/lowlevel.c
> index 644c42269d79..a845d36263fe 100644
> --- a/arch/arm/boards/mnt-reform/lowlevel.c
> +++ b/arch/arm/boards/mnt-reform/lowlevel.c
> @@ -7,7 +7,7 @@
> #include <common.h>
> #include <debug_ll.h>
> #include <firmware.h>
> -#include <i2c/i2c-early.h>
> +#include <pbl/i2c.h>
> #include <mach/atf.h>
> #include <mach/esdctl.h>
> #include <mach/generic.h>
> @@ -36,7 +36,7 @@ static void mnt_reform_setup_uart(void)
> putc_ll('>');
> }
>
> -static void i2c_mux_set(void *i2c, u8 channel)
> +static void i2c_mux_set(struct pbl_i2c *i2c, u8 channel)
> {
> int ret;
> u8 buf[1];
> @@ -50,12 +50,12 @@ static void i2c_mux_set(void *i2c, u8 channel)
>
> buf[0] = 1 << channel;
>
> - ret = i2c_fsl_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> + ret = pbl_i2c_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> if (ret != 1)
> pr_err("failed to set i2c mux\n");
> }
>
> -static void i2c_regulator_set_voltage(void *i2c, u8 reg, u8 voffs)
> +static void i2c_regulator_set_voltage(struct pbl_i2c *i2c, u8 reg, u8 voffs)
> {
> int ret;
> u8 buf[2];
> @@ -70,7 +70,7 @@ static void i2c_regulator_set_voltage(void *i2c, u8 reg, u8 voffs)
> buf[0] = reg;
> buf[1] = 0x80 + voffs;
>
> - ret = i2c_fsl_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> + ret = pbl_i2c_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> if (ret != 1)
> pr_err("failed to set voltage\n");
> }
> @@ -81,7 +81,7 @@ static void i2c_regulator_set_voltage(void *i2c, u8 reg, u8 voffs)
>
> static void mnt_reform_init_power(void)
> {
> - void *i2c;
> + struct pbl_i2c *i2c;
>
> imx8mq_setup_pad(IMX8MQ_PAD_I2C1_SCL__I2C1_SCL | I2C_PAD_CTRL);
> imx8mq_setup_pad(IMX8MQ_PAD_I2C1_SDA__I2C1_SDA | I2C_PAD_CTRL);
> diff --git a/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c b/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c
> index 888bdd079083..e52d0f29a4c9 100644
> --- a/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c
> +++ b/arch/arm/boards/nxp-imx8mm-evk/lowlevel.c
> @@ -7,7 +7,7 @@
> #include <asm/cache.h>
> #include <asm/barebox-arm.h>
> #include <asm/barebox-arm-head.h>
> -#include <i2c/i2c-early.h>
> +#include <pbl/i2c.h>
> #include <linux/sizes.h>
> #include <mach/esdctl.h>
> #include <mach/generic.h>
> @@ -37,7 +37,7 @@ static void setup_uart(void)
> putc_ll('>');
> }
>
> -static void pmic_reg_write(void *i2c, int reg, uint8_t val)
> +static void pmic_reg_write(struct pbl_i2c *i2c, int reg, uint8_t val)
> {
> int ret;
> u8 buf[32];
> @@ -53,14 +53,14 @@ static void pmic_reg_write(void *i2c, int reg, uint8_t val)
>
> msgs[0].len = 2;
>
> - ret = i2c_fsl_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> + ret = pbl_i2c_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> if (ret != 1)
> pr_err("Failed to write to pmic\n");
> }
>
> static int power_init_board(void)
> {
> - void *i2c;
> + struct pbl_i2c *i2c;
>
> imx8mm_setup_pad(IMX8MM_PAD_I2C1_SCL_I2C1_SCL);
> imx8mm_setup_pad(IMX8MM_PAD_I2C1_SDA_I2C1_SDA);
> diff --git a/arch/arm/boards/nxp-imx8mn-evk/lowlevel.c b/arch/arm/boards/nxp-imx8mn-evk/lowlevel.c
> index f53f9c1c6172..37b983f6387a 100644
> --- a/arch/arm/boards/nxp-imx8mn-evk/lowlevel.c
> +++ b/arch/arm/boards/nxp-imx8mn-evk/lowlevel.c
> @@ -9,7 +9,7 @@
> #include <asm/sections.h>
> #include <asm/barebox-arm.h>
> #include <asm/barebox-arm-head.h>
> -#include <i2c/i2c-early.h>
> +#include <pbl/i2c.h>
> #include <linux/sizes.h>
> #include <mach/atf.h>
> #include <mach/xload.h>
> @@ -36,7 +36,7 @@ static void setup_uart(void)
> putc_ll('>');
> }
>
> -static void pmic_reg_write(void *i2c, int addr, int reg, uint8_t val)
> +static void pmic_reg_write(struct pbl_i2c *i2c, int addr, int reg, uint8_t val)
> {
> int ret;
> u8 buf[32];
> @@ -52,12 +52,12 @@ static void pmic_reg_write(void *i2c, int addr, int reg, uint8_t val)
>
> msgs[0].len = 2;
>
> - ret = i2c_fsl_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> + ret = pbl_i2c_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> if (ret != 1)
> pr_err("Failed to write to pmic@%x: %d\n", addr, ret);
> }
>
> -static int i2c_dev_detect(void *i2c, int addr)
> +static int i2c_dev_detect(struct pbl_i2c *i2c, int addr)
> {
> u8 buf[1];
> struct i2c_msg msgs[] = {
> @@ -69,10 +69,10 @@ static int i2c_dev_detect(void *i2c, int addr)
> },
> };
>
> - return i2c_fsl_xfer(i2c, msgs, 1) == 1 ? 0 : -ENODEV;
> + return pbl_i2c_xfer(i2c, msgs, 1) == 1 ? 0 : -ENODEV;
> }
>
> -static void power_init_board_pca9450(void *i2c, int addr)
> +static void power_init_board_pca9450(struct pbl_i2c *i2c, int addr)
> {
> /* BUCKxOUT_DVS0/1 control BUCK123 output */
> pmic_reg_write(i2c, addr, PCA9450_BUCK123_DVS, 0x29);
> @@ -100,7 +100,7 @@ static void power_init_board_pca9450(void *i2c, int addr)
> pmic_reg_write(i2c, addr, PCA9450_RESET_CTRL, 0xA1);
> }
>
> -static void power_init_board_bd71837(void *i2c, int addr)
> +static void power_init_board_bd71837(struct pbl_i2c *i2c, int addr)
> {
> /* decrease RESET key long push time from the default 10s to 10ms */
> pmic_reg_write(i2c, addr, BD718XX_PWRONCONFIG1, 0x0);
> @@ -129,7 +129,7 @@ extern struct dram_timing_info imx8mn_evk_ddr4_timing, imx8mn_evk_lpddr4_timing;
>
> static void start_atf(void)
> {
> - void *i2c;
> + struct pbl_i2c *i2c;
>
> /*
> * If we are in EL3 we are running for the first time and need to
> diff --git a/arch/arm/boards/nxp-imx8mp-evk/lowlevel.c b/arch/arm/boards/nxp-imx8mp-evk/lowlevel.c
> index 338c8024c4a1..43f7d194d806 100644
> --- a/arch/arm/boards/nxp-imx8mp-evk/lowlevel.c
> +++ b/arch/arm/boards/nxp-imx8mp-evk/lowlevel.c
> @@ -10,7 +10,7 @@
> #include <asm/sections.h>
> #include <asm/barebox-arm.h>
> #include <asm/barebox-arm-head.h>
> -#include <i2c/i2c-early.h>
> +#include <pbl/i2c.h>
> #include <linux/sizes.h>
> #include <mach/atf.h>
> #include <mach/xload.h>
> @@ -48,7 +48,7 @@ static void setup_uart(void)
> putc_ll('>');
> }
>
> -static void pmic_reg_write(void *i2c, int reg, uint8_t val)
> +static void pmic_reg_write(struct pbl_i2c *i2c, int reg, uint8_t val)
> {
> int ret;
> u8 buf[32];
> @@ -64,14 +64,14 @@ static void pmic_reg_write(void *i2c, int reg, uint8_t val)
>
> msgs[0].len = 2;
>
> - ret = i2c_fsl_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> + ret = pbl_i2c_xfer(i2c, msgs, ARRAY_SIZE(msgs));
> if (ret != 1)
> pr_err("Failed to write to pmic\n");
> }
>
> static int power_init_board(void)
> {
> - void *i2c;
> + struct pbl_i2c *i2c;
>
> imx8mp_setup_pad(MX8MP_PAD_I2C1_SCL__I2C1_SCL | I2C_PAD_CTRL);
> imx8mp_setup_pad(MX8MP_PAD_I2C1_SDA__I2C1_SDA | I2C_PAD_CTRL);
> diff --git a/common/ddr_spd.c b/common/ddr_spd.c
> index 7089923afb94..52773178e78e 100644
> --- a/common/ddr_spd.c
> +++ b/common/ddr_spd.c
> @@ -6,6 +6,7 @@
> #include <common.h>
> #include <crc.h>
> #include <ddr_spd.h>
> +#include <pbl/i2c.h>
>
> /* used for ddr1 and ddr2 spd */
> static int spd_check(const u8 *buf, u8 spd_rev, u8 spd_cksum)
> @@ -430,9 +431,7 @@ void ddr_spd_print(uint8_t *record)
> #define SPD_SPA0_ADDRESS 0x36
> #define SPD_SPA1_ADDRESS 0x37
>
> -static int select_page(void *ctx,
> - int (*xfer)(void *ctx, struct i2c_msg *msgs, int num),
> - uint8_t addr)
> +static int select_page(struct pbl_i2c *i2c, uint8_t addr)
> {
> struct i2c_msg msg = {
> .addr = addr,
> @@ -440,15 +439,14 @@ static int select_page(void *ctx,
> };
> int ret;
>
> - ret = xfer(ctx, &msg, 1);
> + ret = pbl_i2c_xfer(i2c, &msg, 1);
> if (ret < 0)
> return ret;
>
> return 0;
> }
>
> -static int read_buf(void *ctx,
> - int (*xfer)(void *ctx, struct i2c_msg *msgs, int num),
> +static int read_buf(struct pbl_i2c *i2c,
> uint8_t addr, int page, void *buf)
> {
> uint8_t pos = 0;
> @@ -466,11 +464,11 @@ static int read_buf(void *ctx,
> }
> };
>
> - ret = select_page(ctx, xfer, page);
> + ret = select_page(i2c, page);
> if (ret < 0)
> return ret;
>
> - ret = xfer(ctx, msg, 2);
> + ret = pbl_i2c_xfer(i2c, msg, 2);
> if (ret < 0)
> return ret;
>
> @@ -479,8 +477,7 @@ static int read_buf(void *ctx,
>
> /**
> * spd_read_eeprom - Read contents of a SPD EEPROM
> - * @ctx: Context pointer for the xfer function
> - * @xfer: I2C message transfer function
> + * @i2c: I2C controller handle
> * @addr: I2C bus address for the EEPROM
> * @buf: buffer to read the SPD data to
> *
> @@ -489,19 +486,18 @@ static int read_buf(void *ctx,
> * have a size of 512 bytes. Returns 0 for success or a negative error code
> * otherwise.
> */
> -int spd_read_eeprom(void *ctx,
> - int (*xfer)(void *ctx, struct i2c_msg *msgs, int num),
> +int spd_read_eeprom(struct pbl_i2c *i2c,
> uint8_t addr, void *buf)
> {
> unsigned char *buf8 = buf;
> int ret;
>
> - ret = read_buf(ctx, xfer, addr, SPD_SPA0_ADDRESS, buf);
> + ret = read_buf(i2c, addr, SPD_SPA0_ADDRESS, buf);
> if (ret < 0)
> return ret;
>
> if (buf8[2] == SPD_MEMTYPE_DDR4) {
> - ret = read_buf(ctx, xfer, addr, SPD_SPA1_ADDRESS, buf + 256);
> + ret = read_buf(i2c, addr, SPD_SPA1_ADDRESS, buf + 256);
> if (ret < 0)
> return ret;
> }
> diff --git a/drivers/i2c/busses/i2c-imx-early.c b/drivers/i2c/busses/i2c-imx-early.c
> index a79d7bd88ce1..4e0f7e517d01 100644
> --- a/drivers/i2c/busses/i2c-imx-early.c
> +++ b/drivers/i2c/busses/i2c-imx-early.c
> @@ -9,11 +9,12 @@
> */
> #include <common.h>
> #include <i2c/i2c.h>
> -#include <i2c/i2c-early.h>
> +#include <pbl/i2c.h>
>
> #include "i2c-imx.h"
>
> struct fsl_i2c {
> + struct pbl_i2c i2c;
> void __iomem *regs;
> unsigned int i2cr_ien_opcode;
> unsigned int i2sr_clr_opcode;
> @@ -170,7 +171,7 @@ static int i2c_fsl_write(struct fsl_i2c *fsl_i2c, struct i2c_msg *msg)
> /* write data */
> for (i = 0; i < msg->len; i++) {
> ret = i2c_fsl_send(fsl_i2c, msg->buf[i]);
> - if (ret)
> + if (ret)
> return ret;
> }
>
> @@ -229,9 +230,9 @@ static int i2c_fsl_read(struct fsl_i2c *fsl_i2c, struct i2c_msg *msg)
> * If successful returns the number of messages transferred, otherwise a negative
> * error code is returned.
> */
> -int i2c_fsl_xfer(void *ctx, struct i2c_msg *msgs, int num)
> +static int i2c_fsl_xfer(struct pbl_i2c *i2c, struct i2c_msg *msgs, int num)
> {
> - struct fsl_i2c *fsl_i2c = ctx;
> + struct fsl_i2c *fsl_i2c = container_of(i2c, struct fsl_i2c, i2c);
> unsigned int i, temp;
> int ret;
>
> @@ -288,7 +289,7 @@ static struct fsl_i2c fsl_i2c;
> * This function returns a context pointer suitable to transfer I2C messages
> * using i2c_fsl_xfer.
> */
> -void *ls1046_i2c_init(void __iomem *regs)
> +struct pbl_i2c *ls1046_i2c_init(void __iomem *regs)
> {
> fsl_i2c.regs = regs;
> fsl_i2c.regshift = 0;
> @@ -297,10 +298,12 @@ void *ls1046_i2c_init(void __iomem *regs)
> /* Divider for ~100kHz when coming from the ROM */
> fsl_i2c.ifdr = 0x3e;
>
> - return &fsl_i2c;
> + fsl_i2c.i2c.xfer = i2c_fsl_xfer;
> +
> + return &fsl_i2c.i2c;
> }
>
> -void *imx8m_i2c_early_init(void __iomem *regs)
> +struct pbl_i2c *imx8m_i2c_early_init(void __iomem *regs)
> {
> fsl_i2c.regs = regs;
> fsl_i2c.regshift = 2;
> @@ -309,5 +312,7 @@ void *imx8m_i2c_early_init(void __iomem *regs)
> /* Divider for ~100kHz when coming from the ROM */
> fsl_i2c.ifdr = 0x0f;
>
> - return &fsl_i2c;
> + fsl_i2c.i2c.xfer = i2c_fsl_xfer;
> +
> + return &fsl_i2c.i2c;
> }
> diff --git a/include/ddr_spd.h b/include/ddr_spd.h
> index 6e63d90e5e20..bcc2171d2a50 100644
> --- a/include/ddr_spd.h
> +++ b/include/ddr_spd.h
> @@ -6,7 +6,7 @@
> #ifndef _DDR_SPD_H_
> #define _DDR_SPD_H_
>
> -#include <i2c/i2c.h>
> +#include <pbl/i2c.h>
>
> /*
> * Format from "JEDEC Standard No. 21-C,
> @@ -574,8 +574,7 @@ void ddr2_spd_dump(const struct ddr2_spd_eeprom *spd);
> int ddr3_spd_check(const struct ddr3_spd_eeprom *spd);
> int ddr4_spd_check(const struct ddr4_spd_eeprom *spd);
>
> -int spd_read_eeprom(void *ctx,
> - int (*xfer)(void *ctx, struct i2c_msg *msgs, int num),
> +int spd_read_eeprom(struct pbl_i2c *i2c,
> uint8_t addr, void *buf);
>
> #endif /* _DDR_SPD_H_ */
> diff --git a/include/i2c/i2c-early.h b/include/i2c/i2c-early.h
> deleted file mode 100644
> index fa93656e28e8..000000000000
> --- a/include/i2c/i2c-early.h
> +++ /dev/null
> @@ -1,13 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0-only */
> -
> -#ifndef __I2C_EARLY_H
> -#define __I2C_EARLY_H
> -
> -#include <i2c/i2c.h>
> -
> -int i2c_fsl_xfer(void *ctx, struct i2c_msg *msgs, int num);
> -
> -void *imx8m_i2c_early_init(void __iomem *regs);
> -void *ls1046_i2c_init(void __iomem *regs);
> -
> -#endif /* __I2C_EARLY_H */
> diff --git a/include/pbl/i2c.h b/include/pbl/i2c.h
> new file mode 100644
> index 000000000000..1f26e3dfc6ca
> --- /dev/null
> +++ b/include/pbl/i2c.h
> @@ -0,0 +1,21 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef __PBL_I2C_H
> +#define __PBL_I2C_H
> +
> +#include <i2c/i2c.h>
> +
> +struct pbl_i2c {
> + int (*xfer)(struct pbl_i2c *, struct i2c_msg *msgs, int num);
> +};
> +
> +static inline int pbl_i2c_xfer(struct pbl_i2c *i2c,
> + struct i2c_msg *msgs, int num)
> +{
> + return i2c->xfer(i2c, msgs, num);
> +}
> +
> +struct pbl_i2c *imx8m_i2c_early_init(void __iomem *regs);
> +struct pbl_i2c *ls1046_i2c_init(void __iomem *regs);
> +
> +#endif /* __I2C_EARLY_H */
--
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next prev parent reply other threads:[~2022-08-08 8:46 UTC|newest]
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2022-08-05 12:54 [PATCH 0/9] ARM: i.MX8MN: clean up and enable imx-usb-loader Ahmad Fatoum
2022-08-05 12:54 ` [PATCH 1/9] ARM: i.MX8M: move TF-A chainload functions in <mach/xload.h> Ahmad Fatoum
2022-08-05 12:54 ` [PATCH 2/9] ARM: i.MX8M: imx8mn-evk: use generic imx8mn_load_and_start_image_via_tfa Ahmad Fatoum
2022-08-05 12:54 ` [PATCH 3/9] ARM: i.MX8MN: add SDPS barebox-side support Ahmad Fatoum
2022-08-05 12:54 ` [PATCH 4/9] ARM: i.MX8MN: evk: simplify DDR4/LPDDR4 selection code Ahmad Fatoum
2022-08-05 12:54 ` [PATCH 5/9] ddr: imx8m: rename type to more fitting ddrc|dram_type Ahmad Fatoum
2022-08-05 12:54 ` [PATCH 6/9] ARM: i.MX8M: remove struct dram_timing_info::dram_type again Ahmad Fatoum
2022-08-05 12:54 ` [PATCH 7/9] pbl: generalize fsl i2c_early API into pbl_i2c Ahmad Fatoum
2022-08-08 8:44 ` Ahmad Fatoum [this message]
2022-08-05 12:54 ` [PATCH 8/9] i2c: add <pbl/pmic.h> for PBL use Ahmad Fatoum
2022-08-05 12:54 ` [PATCH 9/9] ARM: i.MX8M: use new pbl/pmic.h API Ahmad Fatoum
2022-08-08 8:30 ` [PATCH 0/9] ARM: i.MX8MN: clean up and enable imx-usb-loader Marco Felsch
2022-08-08 12:32 ` Sascha Hauer
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