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230 lines
4.8 KiB
230 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Earthsoft PT3 driver |
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* |
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* Copyright (C) 2014 Akihiro Tsukada <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/i2c.h> |
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#include <linux/io.h> |
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#include <linux/pci.h> |
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#include "pt3.h" |
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#define PT3_I2C_BASE 2048 |
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#define PT3_CMD_ADDR_NORMAL 0 |
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#define PT3_CMD_ADDR_INIT_DEMOD 4096 |
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#define PT3_CMD_ADDR_INIT_TUNER (4096 + 2042) |
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/* masks for I2C status register */ |
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#define STAT_SEQ_RUNNING 0x1 |
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#define STAT_SEQ_ERROR 0x6 |
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#define STAT_NO_SEQ 0x8 |
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#define PT3_I2C_RUN (1 << 16) |
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#define PT3_I2C_RESET (1 << 17) |
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enum ctl_cmd { |
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I_END, |
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I_ADDRESS, |
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I_CLOCK_L, |
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I_CLOCK_H, |
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I_DATA_L, |
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I_DATA_H, |
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I_RESET, |
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I_SLEEP, |
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I_DATA_L_NOP = 0x08, |
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I_DATA_H_NOP = 0x0c, |
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I_DATA_H_READ = 0x0d, |
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I_DATA_H_ACK0 = 0x0e, |
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I_DATA_H_ACK1 = 0x0f, |
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}; |
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static void cmdbuf_add(struct pt3_i2cbuf *cbuf, enum ctl_cmd cmd) |
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{ |
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int buf_idx; |
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if ((cbuf->num_cmds % 2) == 0) |
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cbuf->tmp = cmd; |
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else { |
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cbuf->tmp |= cmd << 4; |
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buf_idx = cbuf->num_cmds / 2; |
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if (buf_idx < ARRAY_SIZE(cbuf->data)) |
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cbuf->data[buf_idx] = cbuf->tmp; |
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} |
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cbuf->num_cmds++; |
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} |
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static void put_end(struct pt3_i2cbuf *cbuf) |
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{ |
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cmdbuf_add(cbuf, I_END); |
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if (cbuf->num_cmds % 2) |
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cmdbuf_add(cbuf, I_END); |
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} |
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static void put_start(struct pt3_i2cbuf *cbuf) |
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{ |
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cmdbuf_add(cbuf, I_DATA_H); |
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cmdbuf_add(cbuf, I_CLOCK_H); |
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cmdbuf_add(cbuf, I_DATA_L); |
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cmdbuf_add(cbuf, I_CLOCK_L); |
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} |
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static void put_byte_write(struct pt3_i2cbuf *cbuf, u8 val) |
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{ |
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u8 mask; |
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for (mask = 0x80; mask > 0; mask >>= 1) |
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cmdbuf_add(cbuf, (val & mask) ? I_DATA_H_NOP : I_DATA_L_NOP); |
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cmdbuf_add(cbuf, I_DATA_H_ACK0); |
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} |
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static void put_byte_read(struct pt3_i2cbuf *cbuf, u32 size) |
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{ |
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int i, j; |
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for (i = 0; i < size; i++) { |
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for (j = 0; j < 8; j++) |
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cmdbuf_add(cbuf, I_DATA_H_READ); |
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cmdbuf_add(cbuf, (i == size - 1) ? I_DATA_H_NOP : I_DATA_L_NOP); |
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} |
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} |
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static void put_stop(struct pt3_i2cbuf *cbuf) |
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{ |
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cmdbuf_add(cbuf, I_DATA_L); |
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cmdbuf_add(cbuf, I_CLOCK_H); |
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cmdbuf_add(cbuf, I_DATA_H); |
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} |
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/* translates msgs to internal commands for bit-banging */ |
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static void translate(struct pt3_i2cbuf *cbuf, struct i2c_msg *msgs, int num) |
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{ |
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int i, j; |
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bool rd; |
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cbuf->num_cmds = 0; |
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for (i = 0; i < num; i++) { |
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rd = !!(msgs[i].flags & I2C_M_RD); |
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put_start(cbuf); |
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put_byte_write(cbuf, msgs[i].addr << 1 | rd); |
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if (rd) |
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put_byte_read(cbuf, msgs[i].len); |
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else |
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for (j = 0; j < msgs[i].len; j++) |
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put_byte_write(cbuf, msgs[i].buf[j]); |
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} |
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if (num > 0) { |
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put_stop(cbuf); |
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put_end(cbuf); |
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} |
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} |
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static int wait_i2c_result(struct pt3_board *pt3, u32 *result, int max_wait) |
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{ |
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int i; |
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u32 v; |
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for (i = 0; i < max_wait; i++) { |
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v = ioread32(pt3->regs[0] + REG_I2C_R); |
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if (!(v & STAT_SEQ_RUNNING)) |
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break; |
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usleep_range(500, 750); |
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} |
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if (i >= max_wait) |
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return -EIO; |
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if (result) |
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*result = v; |
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return 0; |
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} |
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/* send [pre-]translated i2c msgs stored at addr */ |
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static int send_i2c_cmd(struct pt3_board *pt3, u32 addr) |
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{ |
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u32 ret; |
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/* make sure that previous transactions had finished */ |
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if (wait_i2c_result(pt3, NULL, 50)) { |
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dev_warn(&pt3->pdev->dev, "(%s) prev. transaction stalled\n", |
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__func__); |
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return -EIO; |
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} |
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iowrite32(PT3_I2C_RUN | addr, pt3->regs[0] + REG_I2C_W); |
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usleep_range(200, 300); |
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/* wait for the current transaction to finish */ |
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if (wait_i2c_result(pt3, &ret, 500) || (ret & STAT_SEQ_ERROR)) { |
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dev_warn(&pt3->pdev->dev, "(%s) failed.\n", __func__); |
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return -EIO; |
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} |
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return 0; |
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} |
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/* init commands for each demod are combined into one transaction |
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* and hidden in ROM with the address PT3_CMD_ADDR_INIT_DEMOD. |
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*/ |
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int pt3_init_all_demods(struct pt3_board *pt3) |
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{ |
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ioread32(pt3->regs[0] + REG_I2C_R); |
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return send_i2c_cmd(pt3, PT3_CMD_ADDR_INIT_DEMOD); |
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} |
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/* init commands for two ISDB-T tuners are hidden in ROM. */ |
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int pt3_init_all_mxl301rf(struct pt3_board *pt3) |
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{ |
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usleep_range(1000, 2000); |
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return send_i2c_cmd(pt3, PT3_CMD_ADDR_INIT_TUNER); |
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} |
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void pt3_i2c_reset(struct pt3_board *pt3) |
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{ |
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iowrite32(PT3_I2C_RESET, pt3->regs[0] + REG_I2C_W); |
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} |
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/* |
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* I2C algorithm |
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*/ |
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int |
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pt3_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) |
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{ |
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struct pt3_board *pt3; |
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struct pt3_i2cbuf *cbuf; |
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int i; |
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void __iomem *p; |
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pt3 = i2c_get_adapdata(adap); |
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cbuf = pt3->i2c_buf; |
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for (i = 0; i < num; i++) |
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if (msgs[i].flags & I2C_M_RECV_LEN) { |
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dev_warn(&pt3->pdev->dev, |
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"(%s) I2C_M_RECV_LEN not supported.\n", |
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__func__); |
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return -EINVAL; |
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} |
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translate(cbuf, msgs, num); |
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memcpy_toio(pt3->regs[1] + PT3_I2C_BASE + PT3_CMD_ADDR_NORMAL / 2, |
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cbuf->data, cbuf->num_cmds); |
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if (send_i2c_cmd(pt3, PT3_CMD_ADDR_NORMAL) < 0) |
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return -EIO; |
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p = pt3->regs[1] + PT3_I2C_BASE; |
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for (i = 0; i < num; i++) |
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if ((msgs[i].flags & I2C_M_RD) && msgs[i].len > 0) { |
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memcpy_fromio(msgs[i].buf, p, msgs[i].len); |
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p += msgs[i].len; |
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} |
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return num; |
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} |
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u32 pt3_i2c_functionality(struct i2c_adapter *adap) |
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{ |
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return I2C_FUNC_I2C; |
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}
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